44 results on '"Salinas, Yolanda"'
Search Results
2. Sensitive and high laser damage threshold substrates for surface‐enhanced Raman scattering based on gold and silver nanoparticles.
- Author
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Mayr, Felix, Zimmerleiter, Robert, Farias, Patricia M. A., Bednorz, Mateusz, Salinas, Yolanda, Galembek, André, Cardozo, Olavo D. F., Wielend, Dominik, Oliveira, Dyego, Milani, Raquel, Brito‐Silva, Tania M., Brandstetter, Markus, Padrón‐Hernández, Eduardo, Burgholzer, Peter, Stingl, Andreas, Scharber, Markus C., and Sariciftci, Niyazi Serdar
- Subjects
RAMAN scattering ,SERS spectroscopy ,GOLD nanoparticles ,SILVER nanoparticles ,LASER damage ,SURFACE plasmon resonance - Abstract
Surface‐enhanced Raman scattering (SERS) is a sensitive and fast technique for sensing applications such as chemical trace analysis. However, a successful, high‐throughput practical implementation necessitates the availability of simple‐to‐use and economical SERS substrates. In this work, we present a robust, reproducible, flexible and yet cost‐effective SERS substrate suited for the sensitive detection of analytes at near‐infrared (NIR) excitation wavelengths. The fabrication is based on a simple dropcast deposition of silver or gold nanomaterials on an aluminium foil support, making the design suitable for mass production. The fabricated SERS substrates can withstand very high average Raman laser power of up to 400 mW in the NIR wavelength range while maintaining a linear signal response of the analyte. This enables a combined high signal enhancement potential provided by (i) the field enhancement via the localized surface plasmon resonance introduced by the noble metal nanomaterials and (ii) additional enhancement proportional to an increase of the applicable Raman laser power without causing the thermal decomposition of the analyte. The application of the SERS substrates for the trace detection of melamine and rhodamine 6G is demonstrated, which shows limits of detection smaller than 0.1 ppm and analytical enhancement factors on the order of 104 as compared to bare aluminium foil. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method
- Author
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Jancik Prochazkova, Anna, Scharber, Markus Clark, Yumusak, Cigdem, Jančík, Ján, Másilko, Jiří, Brüggemann, Oliver, Weiter, Martin, Sariciftci, Niyazi Serdar, Krajcovic, Jozef, Salinas, Yolanda, and Kovalenko, Alexander
- Published
- 2020
- Full Text
- View/download PDF
4. Cyclic Peptide Stabilized Lead Halide Perovskite Nanoparticles
- Author
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Jancik Prochazkova, Anna, Salinas, Yolanda, Yumusak, Cigdem, Brüggemann, Oliver, Weiter, Martin, Sariciftci, Niyazi Serdar, Krajcovic, Jozef, and Kovalenko, Alexander
- Published
- 2019
- Full Text
- View/download PDF
5. Pinaceae Pine Resins (Black Pine, Shore Pine, Rosin, and Baltic Amber) as Natural Dielectrics for Low Operating Voltage, Hysteresis‐Free, Organic Field Effect Transistors.
- Author
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Coppola, Maria Elisabetta, Petritz, Andreas, Irimia, Cristian Vlad, Yumusak, Cigdem, Mayr, Felix, Bednorz, Mateusz, Matkovic, Aleksandar, Aslam, Muhammad Awais, Saller, Klara, Schwarzinger, Clemens, Ionita, Maria Daniela, Schiek, Manuela, Smeds, Annika I., Salinas, Yolanda, Brüggemann, Oliver, D'Orsi, Rosarita, Mattonai, Marco, Ribechini, Erika, Operamolla, Alessandra, and Teichert, Christian
- Subjects
LODGEPOLE pine ,AUSTRIAN pine ,ORGANIC field-effect transistors ,LOW voltage systems ,PINE ,PINACEAE ,DIELECTRICS - Abstract
Four pinaceae pine resins analyzed in this study: black pine, shore pine, Baltic amber, and rosin demonstrate excellent dielectric properties, outstanding film forming, and ease of processability from ethyl alcohol solutions. Their trap‐free nature allows fabrication of virtually hysteresis‐free organic field effect transistors operating in a low voltage window with excellent stability under bias stress. Such green constituents represent an excellent choice of materials for applications targeting biocompatibility and biodegradability of electronics and sensors, within the overall effort of sustainable electronics development and environmental friendliness. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
6. Monatshefte für Chemie - Chemical Monthly / Spatial characterization of peptide nucleic acid molecularly imprinted inverse opal
- Author
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Brüggemann, Oliver, Estrada, S.A.Adriana, Gaidies, Sabrina, Febbraro, Jana, Turak, Ayse, Lin, Hong-Ru, and Salinas, Yolanda
- Subjects
Bond order parameters ,Photonic crystals ,Molecularly imprinted polymers ,Peptide nucleic acid ,Inverse opal - Abstract
The combination of molecularly imprinted polymers (MIPs) and inverse opals (IO) have been a point of interest in the past few years due to their potential in sensing applications. At the same time, peptide nucleic acid (PNA) is a stable analogue to natural occurring genetic material. In this study, we describe the preparation and characterization of a PNA imprinted matrix, based on the controlled self-assembly of organized silica particles (SiPs) arrays. The degree of organization of the silica arrays are compared to the organization of the cavities after the removal of the SiPs, using spatial statistical analysis. This analysis of the Voronoi tessellations, pair correlation functions and bond order showed that the successfully formed arrays contain a high degree of quasi-hexagonal (hexatic) organization of the cavities, with both global and local order. The adsorption analysis of the materials show potential for developing future materials with tunable structural reflective properties, such as on-site, color- changing genetic material sensor. Linz Institute of Technology LIT413760001 Version of record
- Published
- 2023
7. Nanomaterials / Lanthanide (Eu, Tb, La)-doped ZnO nanoparticles synthesized using whey as an eco-friendly chelating agent
- Author
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Picasso, Carolina, Salinas, Yolanda, Brüggemann, Oliver, Scharber, Markus Clark, Sariciftci, Niyazi Serdar, Cardozo, Olavo D. F., Rodrigues, Eriverton S., Silva, Marcelo S., Stingl, Andreas, and Farias, Patricia M. A.
- Subjects
safe and sustainability in semiconductor nanomaterials ,zinc oxide nanoparticles ,eco-friendly fluorescent nanomaterials ,doped nanomaterials - Abstract
Strategies for production and use of nanomaterials have rapidly moved towards safety and sustainability. Beyond these requirements, the novel routes must prove to be able to preserve and even improve the performance of the resulting nanomaterials. Increasing demand of high-performance nanomaterials is mostly related to electronic components, solar energy harvesting devices, pharmaceutical industries, biosensors, and photocatalysis. Among nanomaterials, Zinc oxide (ZnO) is of special interest, mainly due to its environmental compatibility and vast myriad of possibilities related to the tuning and the enhancement of ZnO properties. Doping plays a crucial role in this scenario. In this work we report and discuss the properties of undoped ZnO as well as lanthanide (Eu, Tb, and La)-doped ZnO nanoparticles obtained by using whey, a by-product of milk processing, as a chelating agent, without using citrate nor any other chelators. The route showed to be very effective and feasible for the affordable large-scale production of both pristine and doped ZnO nanoparticles in powder form. Version of record
- Published
- 2022
8. Materials / Synthesis and spatial order characterization of controlled silica particle sizes organized as photonic crystals arrays
- Author
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Estrada Alvarez, Silvia Adriana, Guger, Isabella, Febbraro, Jana, Turak, Ayse, Lin, Hong-Ru, Salinas, Yolanda, and Brüggemann, Oliver
- Subjects
bond order parameters ,silica particles ,opals ,photonic crystals ,disLocate ,Voronoi tessellations ,polydispersity index - Abstract
The natural occurrence of precious opals, consisting of highly organized silica particles, has prompted interest in the synthesis and formation of these structures. Previous research has shown that a highly organized photonic crystal (PhC) array is only possible when it is based on a low polydispersity index (PDI) sample of particles. In this study, a solvent-only variation method is used to synthesize different sizes of silica particles (SiPs) by following the traditional sol-gel Stöber approach. The controlled rate of the addition of the reagents promoted the homogeneity of the nucleation and growth of the spherical silica particles, which in turn yielded a low PDI. The opalescent PhC were obtained via self-assembly of these particles using a solvent evaporation method. Analysis of the spatial statistics, using Voronoi tessellations, pair correlation functions, and bond order analysis showed that the successfully formed arrays showed a high degree of quasi-hexagonal (hexatic) organization, with both global and local order. Highly organized PhC show potential for developing future materials with tunable structural reflective properties, such as solar cells, sensing materials, and coatings, among others. Linz Institute of Technology LIT413760001 CHAMS Version of record
- Published
- 2022
9. Israel Journal of Chemistry / Stability enhancements on methylammonium lead-based perovskite nanoparticles : the smart use of host matrices
- Author
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Jančík, Ján, Krajcovic, Jozef, Brüggemann, Oliver, and Salinas, Yolanda
- Subjects
methylammonium ,perovskite nanocrystals ,porous hybrid materials ,stability ,polymers - Abstract
Despite the current advancements, yet improving the intrinsic structure and external environmental stability of hybrid metal halide perovskite nanomaterials is required for developing efficient perovskite-based devices. Up-to-date, a very attractive method is growing and/or embedding perovskite nanocrystals within organic polymeric matrices, or into porous inorganic and hybrid nano/micromaterials (e. g., metal-organic frameworks, mesoporous silica, zeolites, and others), favored through confinement effect within the pores. In this review, we highlighted the last two years of research progress on enhancing the stabilization of perovskite nanoparticles based on methylammonium cations. In the future generation of optoelectronic and photovoltaic devices along with other interesting applied fields, it is predicted that an effective way to trigger the widespread use of this type of perovskite nanocrystals may involve combining different functional host materials, acting as a smarter protection method for the guest nanocrystals. Version of record
- Published
- 2022
10. Advanced Sustainable Systems / Pinaceae fir resins as natural dielectrics for low voltage operating, hysteresis-free organic field effect transistors
- Author
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Ivić, Jelena, Petritz, Andreas, Irimia, Christian Vlad, Kahraman, Bilge, Kanbur, Yasin, Bednorz, Mateusz, Yumusak, Cigdem, Aslam, Muhammad Awais, Matković, Aleksandar, Saller, klara, Schwarzinger, Clemens, Schühly, Wolfgang, Smeds, Annika I., Salinas, Yolanda, Schiek, Manuela, Mayr, Felix, Xu, Chunlin, Teichert, Christian, Osiac, Mariana, Sariciftci, Niyazi Serdar, Stadlober, Barbara, and Irimia-Vladu, Mihai
- Subjects
high breakdown field ,sustainable electronics ,plant resins ,bias stress ,hysteresis-free OFET ,natural dielectrics - Abstract
Natural dielectrics are emerging nowadays as a niche selection of materials for applications targeting biocompatibility and biodegradability for electronics and sensors within the overall effort of scientific community to achieve sustainable development and to build environmental consciousness. The two natural resins analyzed in this study, silver fir and Rocky mountain fir demonstrate robust dielectric properties and excellent film forming capabilities, while being trap free dielectrics in high-performance organic field effect transistors (OFETs) operating at voltages as low as 1 V. Immense research possibilities are demonstrated through the avenue of inorganic nanofillers insertions in the natural resins film, that opens the door for fabrication of very low voltage OFETs with high dielectric constant insulating layers. Osterreichische Forschungsforderungsgesellschaft 863530 867266 Fonds zur Förderung der Wissenschaftlichen Forschung (DE-588)2054142-9 I4323-N36 Y1298-N I1788 N20 M2323 N36 19-52-14006 Version of record
- Published
- 2022
11. Materials / Hollow silica microparticles based on amphiphilic polyphosphazenes
- Author
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Salinas, Yolanda, Poscher, Vanessa, Brüggemann, Oliver, and Teasdale, Ian
- Subjects
thiol-ene photoreaction ,polyphosphazenes ,silica-based hollow microparticles ,hybrid materials ,surfactant-free - Abstract
Hollow microparticles are important materials, offering a larger surface area and lower density than their solid counterparts. Furthermore, their inner void space can be exploited for the encapsulation and release of guest species in a variety of applications. Herein, we present phosphazene-based silica hollow microparticles prepared via a surfactant-free sol-gel process through self-assembly of the alkoxysilyl-containing polymer in water–ethanol solution. Solely, a silane-derived polyphosphazene was used as the precursor for the microparticle formation, without additional classical silica sources. These novel hollow silica-based microparticles were prepared without surfactant, using a designed amphiphilic polyphosphazene for the particle formation made by two components, a hydrophilic unit consisting of 3-mercaptopropyl(trimethoxysilane), and a hydrophobic unit (dodecanethiol) attached to the double bonds from the poly(allylamine)phosphazene backbone via a thiol-ene photoreaction. Due to these two functionalities, a “vesicle”-like self-assembled structure was formed in the reaction medium, which could be then utilized for the microparticle preparation. The influence of NaOH during the synthesis was shown to affect the size and the wall thickness of the microparticles. This effect may enhance the possibilities to tailor such microparticles for drug delivery purposes or for future controlled release of other substances, such as drugs, fragrances, or anticorrosive pigments. Linz Institute of Technology LIT 213760001 DEG-PMO Version of record
- Published
- 2022
12. Pinaceae Fir Resins as Natural Dielectrics for Low Voltage Operating, Hysteresis‐Free Organic Field Effect Transistors.
- Author
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Ivić, Jelena, Petritz, Andreas, Irimia, Cristian Vlad, Kahraman, Bilge, Kanbur, Yasin, Bednorz, Mateusz, Yumusak, Cigdem, Aslam, Muhammad Awais, Matković, Aleksandar, Saller, Klara, Schwarzinger, Clemens, Schühly, Wolfgang, Smeds, Annika I., Salinas, Yolanda, Schiek, Manuela, Mayr, Felix, Xu, Chunlin, Teichert, Christian, Osiac, Mariana, and Sariciftci, Niyazi Serdar
- Subjects
LOW voltage systems ,DIELECTRICS ,DIELECTRIC properties ,SILVER fir ,PINACEAE ,DIELECTRIC films - Abstract
Natural dielectrics are emerging nowadays as a niche selection of materials for applications targeting biocompatibility and biodegradability for electronics and sensors within the overall effort of scientific community to achieve sustainable development and to build environmental consciousness. The two natural resins analyzed in this study, silver fir and Rocky mountain fir demonstrate robust dielectric properties and excellent film forming capabilities, while being trap free dielectrics in high‐performance organic field effect transistors (OFETs) operating at voltages as low as 1 V. Immense research possibilities are demonstrated through the avenue of inorganic nanofillers insertions in the natural resins film, that opens the door for fabrication of very low voltage OFETs with high dielectric constant insulating layers. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
13. Synthesis and Spatial Order Characterization of Controlled Silica Particle Sizes Organized as Photonic Crystals Arrays.
- Author
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Estrada Alvarez, Silvia Adriana, Guger, Isabella, Febbraro, Jana, Turak, Ayse, Lin, Hong-Ru, Salinas, Yolanda, and Brüggemann, Oliver
- Subjects
PHOTONIC crystals ,SPATIAL analysis (Statistics) ,SILICA ,DISCONTINUOUS precipitation ,SOLAR cells - Abstract
The natural occurrence of precious opals, consisting of highly organized silica particles, has prompted interest in the synthesis and formation of these structures. Previous research has shown that a highly organized photonic crystal (PhC) array is only possible when it is based on a low polydispersity index (PDI) sample of particles. In this study, a solvent-only variation method is used to synthesize different sizes of silica particles (SiPs) by following the traditional sol-gel Stöber approach. The controlled rate of the addition of the reagents promoted the homogeneity of the nucleation and growth of the spherical silica particles, which in turn yielded a low PDI. The opalescent PhC were obtained via self-assembly of these particles using a solvent evaporation method. Analysis of the spatial statistics, using Voronoi tessellations, pair correlation functions, and bond order analysis showed that the successfully formed arrays showed a high degree of quasi-hexagonal (hexatic) organization, with both global and local order. Highly organized PhC show potential for developing future materials with tunable structural reflective properties, such as solar cells, sensing materials, and coatings, among others. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
14. Stability Enhancements on Methylammonium Lead‐Based Perovskite Nanoparticles: the Smart Use of Host Matrices.
- Author
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Jančík, Ján, Krajcovic, Jozef, Brüggemann, Oliver, and Salinas, Yolanda
- Subjects
PEROVSKITE ,METHYLAMMONIUM ,NANOPARTICLES ,MESOPOROUS silica ,OPTOELECTRONIC devices ,METAL-organic frameworks ,MESOPOROUS materials - Abstract
Despite the current advancements, yet improving the intrinsic structure and external environmental stability of hybrid metal halide perovskite nanomaterials is required for developing efficient perovskite‐based devices. Up‐to‐date, a very attractive method is growing and/or embedding perovskite nanocrystals within organic polymeric matrices, or into porous inorganic and hybrid nano/micromaterials (e. g. metal‐organic frameworks, mesoporous silica, zeolites, and others), favored through confinement effect within the pores. In this review, we highlighted the last two years of research progress on enhancing the stabilization of perovskite nanoparticles based on methylammonium cations. In the future generation of optoelectronic and photovoltaic devices along with other interesting applied fields, it is predicted that an effective way to trigger the widespread use of this type of perovskite nanocrystals may involve combining different functional host materials, acting as a smarter protection method for the guest nanocrystals. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
15. Channel Modeling for Drug Carrier Matrices
- Author
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Sch��fer, Maximilian, Salinas, Yolanda, Ruderer, Alexander, Enzenhofer, Franz, Br��ggemann, Oliver, Schober, Robert, and Haselmayr, Werner
- Subjects
FOS: Computer and information sciences ,Emerging Technologies (cs.ET) ,Computer Science - Emerging Technologies ,Computer Science::Information Theory - Abstract
Molecular communications is a promising framework for the design of controlled-release drug delivery systems. In this framework, drug carriers are modeled as transmitters, the diseased cells as absorbing receivers, and the channel between transmitter and receiver as diffusive channel. However, existing works on drug delivery systems consider only simple drug carrier models, which limits their practical applicability. In this paper, we investigate diffusion-based spherical matrix-type drug carriers, which are employed in practice. In a matrix carrier, the drug molecules are dispersed in the matrix and diffuse from the inner to the outer layers of the carrier once immersed in a dissolution medium. We derive the channel response of the matrix carrier transmitter for an absorbing receiver and validate the results through particle-based simulations. Moreover, we show that a transparent spherical transmitter, with the drug molecules uniformly distributed over the entire volume, is as special case of the considered matrix system. For this case, we provide an analytical expression for the channel response. Finally, we compare the channel response of the matrix transmitter with those of point and transparent spherical transmitters to reveal the necessity of considering practical models., 6 pages, 5 figures, submitted to 2021 IEEE Global Communications Conference
- Published
- 2021
16. Chemistry - A European Journal / Reversible Speed Regulation of SelfPropelled Janus Micromotors via Thermoresponsive BottleBrush Polymers
- Author
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Fiedler, Christine, Ulbricht, Christoph, Truglas, Tia, Wielend, Dominik, Bednorz, Mateusz, Groiss, Heiko, Brüggemann, Oliver, Teasdale, Ian, and Salinas, Yolanda
- Subjects
micromotors ,microparticles ,polyphosphazenes ,mesoporous silica ,bottle-brush polymers - Abstract
This work reports a reversible braking system for micromotors that can be controlled by small temperature changes (5C). To achieve this, gatedmesoporous organosilica microparticles are internally loaded with metal catalysts (to form the motor) and the exterior (partially) grafted with thermosensitive bottlebrush polyphosphazenes to form Janus particles. When placed in an aqueous solution of H2O2 (the fuel), rapid forward propulsion of the motors ensues due to decomposition of the fuel. Conformational changes of the polymers at defined temperatures regulate the bubble formation rate and thus act as brakes with considerable deceleration/acceleration observed. As the components can be easily varied, this represents a versatile, modular platform for the exogenous velocity control of micromotors. (VLID)5892524 Version of record
- Published
- 2021
17. ChemElectroChem / Immobilized poly(anthraquinones) for electrochemical energy storage applications : structure-property relations
- Author
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Wielend, Dominik, Salinas, Yolanda, Mayr, Felix, Bechmann, Matthias, Yumusak, Cigdem, Neugebauer, Helmut, Brüggemann, Oliver, and Sariciftci, Niyazi Serdar
- Subjects
Immobilization ,Redox-active polymers ,Electrochemistry ,Energy conversion and Storage ,Anthraquinones - Abstract
The majority of energy storage devices like batteries, fuel cells or electrolyzers require heterogeneous electrodes. Immobilization of redox-active organic molecules by a polymeric approach seems to be a promising route towards organic electrodes for electrocatalytic energy storage or in batteries. Although numerous reports on synthesis and application of new poly-anthraquinones exist, a universal guideline or tool for selection of the best polymer, concerning several energy storage applications, is still underdeveloped. Moving into the direction of developing such a tool, we have selected and synthesized three poly(anthraquinones). NMR, FTIR, UV-Vis, TGA, contact angle measurement and SEM revealed certain structure-property trends, which can be correlated with the performance in the electrochemical investigation. The insights gained within this work demonstrate correlations between the FTIR frequencies and the electrochemical reduction potential, as well as between the polymer hydrophobicity and the electrochemical performance. Fonds zur Förderung der Wissenschaftlichen Forschung Z222-N19 Version of record
- Published
- 2021
18. Hollow Silica Microparticles Based on Amphiphilic Polyphosphazenes.
- Author
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Salinas, Yolanda, Poscher, Vanessa, Brüggemann, Oliver, and Teasdale, Ian
- Subjects
- *
POLYPHOSPHAZENES , *POLYMER colloids , *DOUBLE bonds , *SILICA , *POLYMER solutions , *SOL-gel processes - Abstract
Hollow microparticles are important materials, offering a larger surface area and lower density than their solid counterparts. Furthermore, their inner void space can be exploited for the encapsulation and release of guest species in a variety of applications. Herein, we present phosphazene-based silica hollow microparticles prepared via a surfactant-free sol-gel process through self-assembly of the alkoxysilyl-containing polymer in water–ethanol solution. Solely, a silane-derived polyphosphazene was used as the precursor for the microparticle formation, without additional classical silica sources. These novel hollow silica-based microparticles were prepared without surfactant, using a designed amphiphilic polyphosphazene for the particle formation made by two components, a hydrophilic unit consisting of 3-mercaptopropyl(trimethoxysilane), and a hydrophobic unit (dodecanethiol) attached to the double bonds from the poly(allylamine)phosphazene backbone via a thiol-ene photoreaction. Due to these two functionalities, a "vesicle"-like self-assembled structure was formed in the reaction medium, which could be then utilized for the microparticle preparation. The influence of NaOH during the synthesis was shown to affect the size and the wall thickness of the microparticles. This effect may enhance the possibilities to tailor such microparticles for drug delivery purposes or for future controlled release of other substances, such as drugs, fragrances, or anticorrosive pigments. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
19. Lanthanide (Eu, Tb, La)-Doped ZnO Nanoparticles Synthesized Using Whey as an Eco-Friendly Chelating Agent.
- Author
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Picasso, Carolina, Salinas, Yolanda, Brüggemann, Oliver, Scharber, Markus Clark, Sariciftci, Niyazi Serdar, Cardozo, Olavo D. F., Rodrigues, Eriverton S., Silva, Marcelo S., Stingl, Andreas, and Farias, Patricia M. A.
- Subjects
- *
RARE earth metals , *TERBIUM , *ZINC oxide , *NANOPARTICLES , *WHEY , *CHELATING agents , *DAIRY processing , *ENERGY harvesting - Abstract
Strategies for production and use of nanomaterials have rapidly moved towards safety and sustainability. Beyond these requirements, the novel routes must prove to be able to preserve and even improve the performance of the resulting nanomaterials. Increasing demand of high-performance nanomaterials is mostly related to electronic components, solar energy harvesting devices, pharmaceutical industries, biosensors, and photocatalysis. Among nanomaterials, Zinc oxide (ZnO) is of special interest, mainly due to its environmental compatibility and vast myriad of possibilities related to the tuning and the enhancement of ZnO properties. Doping plays a crucial role in this scenario. In this work we report and discuss the properties of undoped ZnO as well as lanthanide (Eu, Tb, and La)-doped ZnO nanoparticles obtained by using whey, a by-product of milk processing, as a chelating agent, without using citrate nor any other chelators. The route showed to be very effective and feasible for the affordable large-scale production of both pristine and doped ZnO nanoparticles in powder form. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
20. Visible Light Photocleavable Ruthenium-Based Molecular Gates to Reversibly Control Release from Mesoporous Silica Nanoparticles
- Author
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Salinas, Yolanda, Brüggemann, Oliver, Monkowius, Uwe, and Teasdale, Ian
- Subjects
lcsh:Chemistry ,ruthenium complex ,reversibility ,lcsh:QD1-999 ,mesoporous silica nanoparticles (MSNs) ,cargo release on demand ,Article ,visible light photocleavage ,molecular gates - Abstract
Herein we present hybrid mesoporous silica nanomaterials (MSN) with visible light-sensitive ruthenium complexes acting as gates. Two different [Ru(bpy)2L1L2]2+ complexes were investigated by grafting [Ru(bpy)2(4AMP)2](PF6)2 (RC1) and [Ru(bpy)2(PPh3)Cl]Cl (RC2) via two or one ligands onto the surface of mesoporous silica nanoparticles (MSNs), to give MSN1-RC1 and MSN2-RC2, respectively. The pores were previously loaded with a common dye, safranin O, and release studies were conducted. The number and position of the ligands were shown to influence the photocages behavior and thus the release of the cargo. Release studies from MSN1-RC1 in acetonitrile showed that in the dark the amount of dye released was minimal after 300 min, whereas a significant increase was measured upon visible light irradiation (ca. 90%). While successful as a photochemically-controlled gated system, RC1 was restricted to organic solvents since it required cleavage of two ligands in order to be cleaved from the surface, and in water only one is cleaved. Release studies from the second nanomaterial MSN2-RC2, where the complex RC2 was bound to the MSN via only one ligand, showed stability under darkness and in aqueous solution up to 180 min and, rapid release of the dye when irradiated with visible light. Furthermore, this system was demonstrated to be reversible, since, upon heating to 80 °, C, the system could effectively re-close the pores and re-open it again upon visible light irradiation. This work, thus, demonstrates the potential reversible gate mechanism of the ruthenium-gated nanomaterials upon visible light irradiation, and could be envisioned as a future design of photochemically-driven drug delivery nanosystems or on/off switches for nanorelease systems.
- Published
- 2020
21. Materials / Trends in degradable mesoporous organosilica-based nanomaterials for controlling drug delivery : a mini review
- Author
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Poscher, Vanessa and Salinas, Yolanda
- Subjects
periodic mesoporous organosilica nanomaterials ,drug delivery ,stimuli-responsive molecular gates ,mesoporous organosilica nanomaterials ,degradable ,nanomedicine - Abstract
The last few years of enhancing the design of hybrid mesoporous organosilica nanoparticles has allowed their degradation under specific pathologic conditions, which finally is showing a light in their potential use as drug delivery systems towards clinical trials. Nevertheless, the issue of controlling the degradation on-demand at cellular level still remains a major challenge, even if it has lately been addressed through the incorporation of degradable organo-bridged alkoxysilanes into the silica framework. On this basis, this mini review covers some of the most recent examples of dierent degradable organosilica nanomaterials with potential application in nanomedicine, from degradable non-porous to mesoporous organosilica nanoparticles (MONs), functionalized with responsive molecular gates, and also the very promising degradable periodic mesoporous organosilica materials (PMOs) only consisting of organosilica bridges. (VLID)5342216 Version of record
- Published
- 2020
22. Nanoscale / Anti-Stokes photoluminescence study on a methylammonium lead bromide nanoparticle film
- Author
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Jancik Prochazkova, Anna, Mayr, Felix, Gugujonovic, Katarina, Hailegnaw, Bekele, Krajcovic, Jozef, Salinas, Yolanda, Brüggemann, Oliver, Sariciftci, Niyazi Serdar, and Scharber, Markus C.
- Abstract
Photon cooling via anti-Stokes photoluminescence (ASPL) is a promising approach to realize all-solid-state cryo-refrigeration by photoexcitation. Photoluminescence quantum yields close to 100% and a strong coupling between phonons and excited states are required to achieve net cooling. We have studied the anti-Stokes photoluminescence of thin films of methylammonium lead bromide nanoparticles. We found that the anti-Stokes photoluminescence is thermally activated with an activation energy of ∼80 meV. At room temperature the ASPL up-conversion efficiency is ∼60% and it depends linearly on the excitation intensity. Our results suggest that upon further optimization of their optical properties, the investigated particles could be promising candidates for the demonstration of photon cooling in thin solid films. Version of record
- Published
- 2020
23. RSC Advances / Dual stimuli-responsive polyphosphazene-based molecular gates for controlled drug delivery in lung cancer cells
- Author
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Salinas, Yolanda, Kneidinger, Michael, Fornaguera, Cristina, Borrós, Salvador, Brüggemann, Oliver, and Teasdale, Ian
- Subjects
lung cancer cells ,drug delivery ,molecular gates - Abstract
A switchable silane derived stimuli-responsive bottle-brush polyphosphazene (PPz) was prepared and attached to the surface of mesoporous silica nanoparticles (MSNs). The hybrid polymer with PEG-like Jeffamine® M-2005 side-arms undergo conformational changes in response to both pH and temperature due to its amphiphilic substituents and protonatable main-chain, hence were investigated as a gatekeeper. Safranin O as control fluorophore or the anticancer drug camptothecin (CPT) were encapsulated in the PPz-coated MSNs. At temperatures below the lower critical solution temperature (LCST), the swollen conformation of PPz efficiently blocked the cargo within the pores. However, above the LCST, the PPz collapsed, allowing release of the payload. Additionally, protonation of the polymer backbone at lower pH values was observed to enhance opening of the pores from the surface of the MSNs and therefore the release of the dye. In vitro studies demonstrated the ability of these nanoparticles loaded with the drug camptothecin to be endocytosed in both models of tumor (A549) and healthy epithelial (BEAS-2B) lung cells. Their accumulation and the release of the chemotherapeutic drug, co-localized within lysosomes, was faster and higher for tumor than for healthy cells, further, the biocompatibility of PPz-gated nanosystem without drug was demonstrated. Tailored dual responsive polyphosphazenes thus represent novel and promising candidates in the construction of future gated mesoporous silica nanocarriers designs for lung cancer-directed treatment. (VLID)5485896 Version of record
- Published
- 2020
24. International Journal of Molecular Sciences / Hybrid Porous Microparticles Based on a Single Organosilica Cyclophosphazene Precursor
- Author
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Poscher, Vanessa, Pappas, George S., Brüggemann, Oliver, Teasdale, Ian, and Salinas, Yolanda
- Subjects
degradability ,hybrid materials ,cyclophosphazenes ,post-functionalization ,porous organosilica microparticles - Abstract
Porous organosilica microparticles consisting of silane-derived cyclophosphazene bridges were synthesized by a surfactant-mediated sol-gel process. Starting from the substitution of hexachlorocyclotriphosphazene with allylamine, two different precursors were obtained by anchoring three or six alkoxysilane units, via a thiol-ene photoaddition reaction. In both cases, spherical, microparticles (size average of ca. 1000 nm) with large pores were obtained, confirmed by both, scanning and transmission electron microscopy. Particles synthesized using the partially functionalized precursor containing free vinyl groups were further functionalized with a thiol-containing molecule. While most other reported mesoporous organosilica particles are essentially hybrids with tetraethyl orthosilicate (TEOS), a unique feature of these particles is that structural control is achieved by exclusively using organosilane precursors. This allows an increase in the proportion of the co-components and could springboard these novel phosphorus-containing organosilica microparticles for different areas of technology. (VLID)5689376 Version of record
- Published
- 2020
25. Immobilized Poly(anthraquinones) for Electrochemical Energy Storage Applications: Structure‐Property Relations.
- Author
-
Wielend, Dominik, Salinas, Yolanda, Mayr, Felix, Bechmann, Matthias, Yumusak, Cigdem, Neugebauer, Helmut, Brüggemann, Oliver, and Sariciftci, Niyazi Serdar
- Subjects
ENERGY storage ,ELECTROLYTIC reduction ,REDUCTION potential ,CONTACT angle ,BATTERY storage plants ,ANTHRAQUINONES - Abstract
The majority of energy storage devices like batteries, fuel cells or electrolyzers require heterogeneous electrodes. Immobilization of redox‐active organic molecules by a polymeric approach seems to be a promising route towards organic electrodes for electrocatalytic energy storage or in batteries. Although numerous reports on synthesis and application of new poly‐anthraquinones exist, a universal guideline or tool for selection of the best polymer, concerning several energy storage applications, is still underdeveloped. Moving into the direction of developing such a tool, we have selected and synthesized three poly(anthraquinones). NMR, FTIR, UV‐Vis, TGA, contact angle measurement and SEM revealed certain structure‐property trends, which can be correlated with the performance in the electrochemical investigation. The insights gained within this work demonstrate correlations between the FTIR frequencies and the electrochemical reduction potential, as well as between the polymer hydrophobicity and the electrochemical performance. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
26. Reversible Speed Regulation of Self‐Propelled Janus Micromotors via Thermoresponsive Bottle‐Brush Polymers.
- Author
-
Fiedler, Christine, Ulbricht, Christoph, Truglas, Tia, Wielend, Dominik, Bednorz, Mateusz, Groiss, Heiko, Brüggemann, Oliver, Teasdale, Ian, and Salinas, Yolanda
- Subjects
THERMORESPONSIVE polymers ,SPEED limits ,MICROMOTORS ,JANUS particles ,METAL catalysts - Abstract
This work reports a reversible braking system for micromotors that can be controlled by small temperature changes (≈5 °C). To achieve this, gated‐mesoporous organosilica microparticles are internally loaded with metal catalysts (to form the motor) and the exterior (partially) grafted with thermosensitive bottle‐brush polyphosphazenes to form Janus particles. When placed in an aqueous solution of H2O2 (the fuel), rapid forward propulsion of the motors ensues due to decomposition of the fuel. Conformational changes of the polymers at defined temperatures regulate the bubble formation rate and thus act as brakes with considerable deceleration/acceleration observed. As the components can be easily varied, this represents a versatile, modular platform for the exogenous velocity control of micromotors. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
27. Anti-Stokes photoluminescence study on a methylammonium lead bromide nanoparticle film.
- Author
-
Jancik Prochazkova, Anna, Mayr, Felix, Gugujonovic, Katarina, Hailegnaw, Bekele, Krajcovic, Jozef, Salinas, Yolanda, Brüggemann, Oliver, Sariciftci, Niyazi Serdar, and Scharber, Markus C.
- Published
- 2020
- Full Text
- View/download PDF
28. Dual stimuli-responsive polyphosphazene-based molecular gates for controlled drug delivery in lung cancer cells.
- Author
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Salinas, Yolanda, Kneidinger, Michael, Fornaguera, Cristina, Borrós, Salvador, Brüggemann, Oliver, and Teasdale, Ian
- Published
- 2020
- Full Text
- View/download PDF
29. Controlling Quantum Confinement in Luminescent Perovskite Nanoparticles for Optoelectronic Devices by the Addition of Water.
- Author
-
Jancik Prochazkova, Anna, Salinas, Yolanda, Yumusak, Cigdem, Scharber, Markus Clark, Brüggemann, Oliver, Weiter, Martin, Sariciftci, Niyazi Serdar, Krajcovic, Jozef, and Kovalenko, Alexander
- Abstract
Here, a simple method for controlling the size of the perovskite nanoparticles (PNPs) during preparation is reported. Metal halide PNPs have great potential for application in optoelectronic devices, such as light-emitting diodes, lasers, photodetectors, etc. They have exceptionally high photoluminescence quantum yields (PLQYs) and exhibit chemical tunability for versatile modifications of the perovskite structural composition, enabling the synthesis of nanoparticles with controlled size, shape, and optical properties. In this work, methylammonium lead bromide PNPs were prepared using a hygroscopic stabilizing ligand, tert-butoxycarbonyl-Lysine (tboc-Lysine). Water was used as an additive in the precursor solution, which resulted in the formation of highly mobile species and, thus, the nhancement of perovskite lattice growth. This method allowed the preparation of PNPs with controlled size between 4 and 7 nm. The quantum confinement effect led to a fine-tuned optical band gap of the nanoparticles. Increasing the amount of water added from 0 to 32 mol equiv with respect to Lead-(II) bromide (PbBr
2 ) increased the PLQY to 70% in colloidal solutions and to 87% in thin films. Therefore, because of control over the size and high luminescent yields, the above-mentioned nanoparticles are targeted for use in optoelectronic devices. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
30. Proteinogenic Amino Acid Assisted Preparation of Highly Luminescent Hybrid Perovskite Nanoparticles.
- Author
-
Jancik Prochazkova, Anna, Demchyshyn, Stepan, Yumusak, Cigdem, Másilko, Jiří, Brüggemann, Oliver, Weiter, Martin, Kaltenbrunner, Martin, Sariciftci, Niyazi Serdar, Krajcovic, Jozef, Salinas, Yolanda, and Kovalenko, Alexander
- Published
- 2019
- Full Text
- View/download PDF
31. Surfactant-Free Synthesis of Cyclomatrix and Linear Organosilica Phosphazene-Based Hybrid Nanoparticles.
- Author
-
Poscher, Vanessa, Teasdale, Ian, and Salinas, Yolanda
- Published
- 2019
- Full Text
- View/download PDF
32. Pseudorotaxane capped mesoporous silica nanoparticles for 3,4-methylenedioxymethamphetamine (MDMA) detection in water.
- Author
-
Lozano-Torres, Beatriz, Pascual, Lluís, Bernardos, Andrea, Marcos, María D., Jeppesen, Jan O., Salinas, Yolanda, Martínez-Máñez, Ramón, and Sancenón, Félix
- Subjects
NANOPARTICLES manufacturing ,SILICA nanoparticles ,OXIDES - Abstract
Mesoporous silica nanoparticles loaded with fluorescein and capped by a pseudorotaxane, formed between a naphthalene derivative and cyclobis(paraquat-p-phenylene) (CBPQT
4+ ), were used for the selective and sensitive fluorogenic detection of 3,4-methylenedioxymethamphetamine (MDMA). [ABSTRACT FROM AUTHOR]- Published
- 2017
- Full Text
- View/download PDF
33. Molecularly Imprinted Polymer Coated Quantum Dots for Multiplexed Cell Targeting and Imaging.
- Author
-
Panagiotopoulou, Maria, Salinas, Yolanda, Beyazit, Selim, Kunath, Stephanie, Duma, Luminita, Prost, Elise, Mayes, Andrew G., Resmini, Marina, Bernadette Tse Sum Bui, and Haupt, Karsten
- Subjects
- *
CELL imaging , *MOLECULAR imprinting , *QUANTUM dots , *PHOTOPOLYMERIZATION , *EXCITATION spectrum , *GLUCURONIC acid - Abstract
Advanced tools for cell imaging are of great interest for the detection, localization, and quantification of molecular biomarkers of cancer or infection. We describe a novel photopolymerization method to coat quantum dots (QDs) with polymer shells, in particular, molecularly imprinted polymers (MIPs), by using the visible light emitted from QDs excited by UV light. Fluorescent core-shell particles specifically recognizing glucuronic acid (GlcA) or N-acetylneuraminic acid (NANA) were prepared. Simultaneous multiplexed labeling of human keratinocytes with green QDs conjugated with MIPGlcA and red QDs conjugated with MIP-NANA was demonstrated by fluorescence imaging. The specificity of binding was verified with a non-imprinted control polymer and by enzymatic cleavage of the terminal GlcA and NANA moieties. The coating strategy is potentially a generic method for the functionalization of QDs to address a much wider range of biocompatibility and biorecognition issues. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
34. Smart Polymeric Nanoparticles as Emerging Tools for Imaging-The Parallel Evolution of Materials.
- Author
-
Papadimitriou, Sofia A., Salinas, Yolanda, and Resmini, Marina
- Subjects
- *
POLYMERS , *NANOPARTICLES , *NANOTECHNOLOGY , *IMAGING systems , *CANCER cells - Abstract
The field of imaging has developed considerably over the past decade and recent advances in the area of nanotechnology, in particular nanomaterials, have opened new opportunities. Polymeric nanoparticles are particularly interesting and a number of novel materials, characterized by stimuli-responsive characteristics and fluorescent tagging, have allowed visualization, intracellular labeling and real-time tracking. In some of the latest applications the nanoparticles have been used for imagining of tumor cells, both in vivo and ex vivo. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
35. Front Cover: Reversible Speed Regulation of Self‐Propelled Janus Micromotors via Thermoresponsive Bottle‐Brush Polymers (Chem. Eur. J. 10/2021).
- Author
-
Fiedler, Christine, Ulbricht, Christoph, Truglas, Tia, Wielend, Dominik, Bednorz, Mateusz, Groiss, Heiko, Brüggemann, Oliver, Teasdale, Ian, and Salinas, Yolanda
- Subjects
THERMORESPONSIVE polymers ,SPEED limits ,MICROMOTORS ,MESOPOROUS silica ,SILICA nanoparticles - Abstract
Manganese ions are embedded in microporous silica nanoparticles to catalyse the degradation of the H SB 2 sb O SB 2 sb "fuel" to water and gaseous oxygen. Keywords: bottle-brush polymers; mesoporous silica; micromotors; microparticles; polyphosphazenes EN bottle-brush polymers mesoporous silica micromotors microparticles polyphosphazenes 3187 3187 1 02/17/21 20210215 NES 210215 B Self-propelled micromotors b with a reversible braking system are shown. Manganese ions are embedded in microporous silica nanoparticles to catalyse the degradation of the H SB 2 sb O SB 2 sb "fuel" to water and gaseous oxygen. [Extracted from the article]
- Published
- 2021
- Full Text
- View/download PDF
36. Hybrid Porous Microparticles Based on a Single Organosilica Cyclophosphazene Precursor.
- Author
-
Poscher, Vanessa, Pappas, George S., Brüggemann, Oliver, Teasdale, Ian, and Salinas, Yolanda
- Subjects
SCANNING transmission electron microscopy ,VINYL polymers ,FREE groups ,ETHYL silicate ,SOL-gel processes - Abstract
Porous organosilica microparticles consisting of silane-derived cyclophosphazene bridges were synthesized by a surfactant-mediated sol-gel process. Starting from the substitution of hexachlorocyclotriphosphazene with allylamine, two different precursors were obtained by anchoring three or six alkoxysilane units, via a thiol-ene photoaddition reaction. In both cases, spherical, microparticles (size average of ca. 1000 nm) with large pores were obtained, confirmed by both, scanning and transmission electron microscopy. Particles synthesized using the partially functionalized precursor containing free vinyl groups were further functionalized with a thiol-containing molecule. While most other reported mesoporous organosilica particles are essentially hybrids with tetraethyl orthosilicate (TEOS), a unique feature of these particles is that structural control is achieved by exclusively using organosilane precursors. This allows an increase in the proportion of the co-components and could springboard these novel phosphorus-containing organosilica microparticles for different areas of technology. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
37. Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method.
- Author
-
Jancik Prochazkova, Anna, Scharber, Markus Clark, Yumusak, Cigdem, Jančík, Ján, Másilko, Jiří, Brüggemann, Oliver, Weiter, Martin, Sariciftci, Niyazi Serdar, Krajcovic, Jozef, Salinas, Yolanda, and Kovalenko, Alexander
- Subjects
PEROVSKITE ,NANOPARTICLES ,NANOSTRUCTURED materials ,NANOSTRUCTURES ,LIGANDS (Biochemistry) - Abstract
This work reports on an optimized procedure to synthesize methylammonium bromide perovskite nanoparticles. The ligand-assisted precipitation synthetic pathway for preparing nanoparticles is a cost-effective and promising method due to its ease of scalability, affordable equipment requirements and convenient operational temperatures. Nevertheless, there are several parameters that influence the resulting optical properties of the final nanomaterials. Here, the influence of the choice of solvent system, capping agents, temperature during precipitation and ratios of precursor chemicals is described, among other factors. Moreover, the colloidal stability and stability of the precursor solution is studied. All of the above-mentioned parameters were observed to strongly affect the resulting optical properties of the colloidal solutions. Various solvents, dispersion media, and selection of capping agents affected the formation of the perovskite structure, and thus qualitative and quantitative optimization of the synthetic procedure conditions resulted in nanoparticles of different dimensions and optical properties. The emission maxima of the nanoparticles were in the 508–519 nm range due to quantum confinement, as confirmed by transmission electron microscopy. This detailed study allows the selection of the best optimal conditions when using the ligand-assisted precipitation method as a powerful tool to fine-tune nanostructured perovskite features targeted for specific applications. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
38. Trends in Degradable Mesoporous Organosilica-Based Nanomaterials for Controlling Drug Delivery: A Mini Review.
- Author
-
Poscher, Vanessa and Salinas, Yolanda
- Subjects
- *
MESOPOROUS silica , *NANOSTRUCTURED materials , *DRUG control , *DRUG delivery systems , *NANOPARTICLES , *MESOPOROUS materials - Abstract
The last few years of enhancing the design of hybrid mesoporous organosilica nanoparticles has allowed their degradation under specific pathologic conditions, which finally is showing a light in their potential use as drug delivery systems towards clinical trials. Nevertheless, the issue of controlling the degradation on-demand at cellular level still remains a major challenge, even if it has lately been addressed through the incorporation of degradable organo-bridged alkoxysilanes into the silica framework. On this basis, this mini review covers some of the most recent examples of different degradable organosilica nanomaterials with potential application in nanomedicine, from degradable non-porous to mesoporous organosilica nanoparticles (MONs), functionalized with responsive molecular gates, and also the very promising degradable periodic mesoporous organosilica materials (PMOs) only consisting of organosilica bridges. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
39. Mesoporous Silica Micromotors with a Reversible Temperature Regulated On–Off Polyphosphazene Switch.
- Author
-
Kneidinger, Michael, Iturmendi, Aitziber, Ulbricht, Christoph, Truglas, Tia, Groiss, Heiko, Teasdale, Ian, and Salinas, Yolanda
- Subjects
MICROMOTORS ,BRAKE systems ,MESOPOROUS silica ,HYDROGEN peroxide ,MICROSCOPY ,SURFACE temperature ,SILANE - Abstract
The incorporation of an extraneous on–off braking system is necessary for the effective motion control of the next generation of micrometer‐sized motors. Here, the design and synthesis of micromotors is reported based on mesoporous silica particles containing bipyridine groups, introduced by cocondensation, for entrapping catalytic cobalt(II) ions within the mesochannels, and functionalized on the surface with silane‐derived temperature responsive bottle‐brush polyphosphazene. Switching the polymers in a narrow temperature window of 25–30 °C between the swollen and collapsed state, allows the access for the fuel H2O2 contained in the dispersion medium to cobalt(II) bipyridinato catalyst sites. The decomposition of hydrogen peroxide is monitored by optical microscopy, and effectively operated by reversibly closing or opening the pores by the grafted gate‐like polyphosphazene, to control on demand the oxygen bubble generation. This design represents one of the few examples using temperature as a trigger for the reversible on–off external switching of mesoporous silica micromotors. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
40. Improving the Performance of Perovskite Solar Cells using a Polyphosphazene Interfacing Layer.
- Author
-
Hailegnaw, Bekele, Poscher, Vanessa, Ulbricht, Christoph, Seelajaroen, Hathaichanok, Teasdale, Ian, Salinas, Yolanda, Sariciftci, Niyazi Serdar, and Scharber, Markus Clark
- Subjects
SOLAR cells ,OPEN-circuit voltage ,PEROVSKITE ,SHORT-circuit currents ,BUFFER layers ,DENSITY currents - Abstract
Herein, the impact of thin layer of polyphosphazene derivatives, as a buffer layer between the electron‐transporting layer and the back metal‐contact in mixed‐cation mixed‐halide perovskite solar cells (PSCs), is explored. PSCs with a poly[bis(allylamino)phosphazene] (PPz) interlayer exhibit enhanced rectification in the photo‐induced current density–voltage (J–V) curves, which show improved photovoltaic performance and photostability with reduced hysteresis. The thickness of the interlayer is optimized and the optimized PSCs with PPz buffer layer shows an average open‐circuit voltage (VOC) of ≈1.05 V, a short‐circuit current density (JSC) of around 23.5 mA cm−2, a fill factor of ≈72%, and a power conversion efficiency of about 17.3% for the forward and reverse scans under simulated AM1.5G illumination. Moreover, the application of PPz as an electron‐transporting interlayer in organic solar cells reveals that PPz interfacial layer improves the electron extraction at the cathode. The merit of applying PPz interlayer extends to the possibility of using different metals (such as aluminum, gold, copper, and silver) as the top contact in the prepared PCSs. In general, these experiments reveal a very promising approach to tackle the issue of interfacing, and to improve the performance and stability of PSCs. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
41. ChemInform Abstract: Smart Polymeric Nanoparticles as Emerging Tools for Imaging - The Parallel Evolution of Materials.
- Author
-
Papadimitriou, Sofia A., Salinas, Yolanda, and Resmini, Marina
- Subjects
- *
NANOPARTICLES , *IMAGING systems - Abstract
Review: [62 refs. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
42. Cover Picture: Synthesis of Chiral Tertiary Alcohols by CuI-Catalyzed Enantioselective Addition of Organomagnesium Reagents to Ketones / Emergence of the First Catalytic Oligonucleotides in a Formamide-Based Origin Scenario / Intermolecular Peptide Cross-Linking by Using Diaminodicarboxylic Acids / Smart Polymeric Nanoparticles as Emerging Tools for Imaging-The Parallel Evolution of Materials / Transition Metal Nitrides for Electrocatalytic Energy Conversion: Opportunities and Challenges / Carbonylmetallates-A Special Family of Nucleophiles in Aromatic and Vinylic Substitution Reactions / The Diaza[5.5.6.6]fenestrane Skeleton-Synthesis of Leuconoxine Alkaloids / Organocatalytic Asymmetric Reactions of Epoxides: Recent Progress (Chem. Eur. J. 11/2016)
- Author
-
Rong, Jiawei, Pellegrini, Tilde, Harutyunyan, Syuzanna R., Šponer, Judit E., Šponer, Jiří, Nováková, Olga, Brabec, Viktor, Šedo, Ondrej, Zdráhal, Zbyněk, Costanzo, Giovanna, Pino, Samanta, Saladino, Raffaele, Di Mauro, Ernesto, Kamalov, Meder, Kaur, Harveen, Brimble, Margaret A., Papadimitriou, Sofia A., Salinas, Yolanda, Resmini, Marina, and Xie, Junfeng
- Subjects
WOMEN in chemistry ,INTERNATIONAL Women's Day - Abstract
To celebrate International Women′s Day on March 8th 2016, Chemistry – A European Journal is publishing a special issue dedicated to women around the world currently working in chemical research. The cover picture shows the frontispieces of the Concept, Review, and Minireview articles published in this issue, highlighting the broad range of chemistry that is currently being carried out by female researchers. In the top row from left to right: S. Harutyunyan et al. (page 3558 ff.), J. Sponer et al. (page 3572 ff.), and M. Brimble et al. (page 3622 ff.). In the middle row from left to right: M. Resmini et al. (page 3612 ff.), the logo for International Women′s Day 2016 (http://www. internationalwomensday.com/), and Y. Xie and J. Xie (page 3588 ff.). In the bottom row from left to right: I. Beletskaya and P. Sazonov (page 3644 ff.), T. Gaich and M. Pfaffenbach (page 3600 ff.), and A. Lattanzi and S. Meninno (page 3632 ff.). [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
43. Reversible Speed Regulation of Self-Propelled Janus Micromotors via Thermoresponsive Bottle-Brush Polymers.
- Author
-
Fiedler C, Ulbricht C, Truglas T, Wielend D, Bednorz M, Groiss H, Brüggemann O, Teasdale I, and Salinas Y
- Abstract
Invited for the cover of this issue is the group of Ian Teasdale and Yolanda Salinas at the Johannes Kepler University Linz. The image depicts the self-propelled Janus micromotors reported in this work. Read the full text of the article at 10.1002/chem.202004792., (© 2021 Wiley-VCH GmbH.)
- Published
- 2021
- Full Text
- View/download PDF
44. Biocompatible Phenylboronic-Acid-Capped ZnS Nanocrystals Designed As Caps in Mesoporous Silica Hybrid Materials for on-Demand pH-Triggered Release In Cancer Cells.
- Author
-
Salinas Y, Hoerhager C, García-Fernández A, Resmini M, Sancenón F, Matínez-Máñez R, and Brueggemann O
- Subjects
- Biocompatible Materials chemistry, Biocompatible Materials pharmacokinetics, Biocompatible Materials pharmacology, Delayed-Action Preparations chemistry, Delayed-Action Preparations pharmacokinetics, Delayed-Action Preparations pharmacology, HeLa Cells, Humans, Hydrogen-Ion Concentration, Neoplasms metabolism, Porosity, Boronic Acids chemistry, Epirubicin chemistry, Epirubicin pharmacokinetics, Epirubicin pharmacology, Nanoparticles chemistry, Neoplasms drug therapy, Silicon Dioxide chemistry, Sulfides chemistry, Zinc Compounds chemistry
- Abstract
Biocompatible ZnS-based nanocrystals capped with 4-mercaptophenylboronic acid (ZnS@B) have been size-designed as excellent pH-responsive gatekeepers on mesoporous silica nanoparticles (MSNs), which encapsulate fluorophore safranin O (S2-Saf) or anticancer drug epirubicin hydrochloride (S2-Epi) for delivery applications in cancer cells. In this novel hybrid system, the gate mechanism consists of reversible pH-sensitive boronate ester moieties linking the nanocrystals directly to the alcohol groups from silica surface scaffold, avoiding tedious intermediate functionalization steps. The ∼3 nm size of the ZnS@B nanocrystals was tailored to allow efficient sealing of the pore voids and achieve a "zero premature cargo release" at neutral pH (7.4). The system selectively released the cargo in acidic conditions (pH 5.4 and 3.0) because of the hydrolysis of the boronate esters, which unblocked the pore voids. Delivery of the cargo by off-on cycles was demonstrated by changes in pH from 7.4 to 3.0, showing its potential pH-switching behavior. Cellular uptake of these nanocarriers within human cervix adenocarcinoma (HeLa) cells was achieved and the controlled release of the chemotherapeutic drug epirubicin was shown to occur within the endogenous endosomal/lysosomal acidified cancer cell microenvironment and further diffused into the cytosol. Cytotoxicity tests done on the mesoporous support without cargo and covalently linked with ZnS@B nanocrystals as caps were negative, suggesting that the proposed system is biocompatible and can be considered as a very promising drug nanocarrier.
- Published
- 2018
- Full Text
- View/download PDF
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