Search

Your search keyword '"Soler-Illia, Galo J. A. A."' showing total 372 results
Start Over Author "Soler-Illia, Galo J. A. A."
372 results on '"Soler-Illia, Galo J. A. A."'

52. Highly Ordered Mesoporous Hydroxide Thin Films through Self-Assembly of Size-Tailored Nano-Building Blocks: A Theoretical-Experimental Approach

Author

Tarutani, Naoki, Tokudome, Yasuaki, Jobbágy, Matías, Soler-Illia, Galo J. A. A., Tang, Qiyun, Müller, Marcus, Takahashi, Masahide, Tarutani, Naoki, Tokudome, Yasuaki, Jobbágy, Matías, Soler-Illia, Galo J. A. A., Tang, Qiyun, Müller, Marcus, and Takahashi, Masahide

Abstract

application/pdf, Chemistry of Materials. 2019, 31(2), P.322-330

Published
2019

57. Phonon dynamics in novel materials and hybrid structures

Author

Haacke, Stefan, Sandeep, Sathyan, Cardozo de Oliveira, Edson R., Carreira, Santiago, Papatryfonos, Konstantinos, Morassi, Martina, Lemaitre, Aristide, Vensaus, Priscila, Xiang, Chushuang, Steren, Laura B., Briatico, Javier, Soler-Illia, Galo J. A. A., and Lanzillotti-Kimura, Norberto Daniel

Published
2024
Full Text
View/download PDF

67. Flexible Ligand‐Based Lanthanide Three‐Dimensional Metal–Organic Frameworks with Tunable Solid‐State Photoluminescence and OH‐Solvent‐Sensing Properties

Author

Gomez, Germán E., primary, Brusau, Elena V., additional, Kaczmarek, Anna M., additional, Mellot‐Draznieks, Caroline, additional, Sacanell, Joaquín, additional, Rousse, Gwenaelle, additional, Van Deun, Rik, additional, Sanchez, Clément, additional, Narda, Griselda E., additional, and Soler Illia, Galo J. A. A., additional

Published
2017
Full Text
View/download PDF

70. TiO2 mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities.

Author

Steinberg, Paula Y., Zalduendo, M. Mercedes, Giménez, Gustavo, Soler-Illia, Galo J. A. A., and Angelomé, Paula C.

Abstract

In this paper, a systematic study regarding the effect of the mesoporous structure over Au nanoparticles (NPs) growth inside and through the pores of mesoporous TiO2 thin films (MTTFs) is presented, and the effect of such characteristics over the composites’ sensing capabilities is evaluated. Highly stable MTTFs with different pore diameters (range: 4–8 nm) and pore arrangements (body- and face-centered cubic) were synthesized and characterized. Au NPs were grown inside the pores, and it was demonstrated―through a careful physicochemical characterization―that the amount of incorporated Au and NP size depends on the pore array; being higher for bigger pore diameters and face-centered cubic structures. The same structure allows the growth of more and longer tips over Au NPs deposited at the thin film–substrate interface. Finally, to confirm the effect of the structural characteristics of the composites over their possible applications, the materials were tested as surface-enhanced Raman scattering (SERS)-based substrates. The composites with a higher amount of Au and more ramified NPs were the ones that presented better sensitivity in the detection of a probe molecule (4-nitrothiophenol). Overall, this work demonstrates that the pore size and ordering in MTTFs determine the materials’ accessibility and connectivity, and therefore, have a clear impact on their potential applications. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

78. Novel Electrochemical Paper-Based Immunocapture Assay for the Quantitative Determination of Ethinylestradiol in Water Samples

Author

Scala-Benuzzi, María L., Raba, Julio, Soler-Illia, Galo J. A. A., Schneider, Rudolf J., and Messina, Germán A.

Abstract

We report a novel and innovative electrochemical paper-based immunocapture assay (EPIA) to address the need for ultrasensitive detection of emerging pollutants without regulatory status and whose effects on environment and human health are not completely yet understood. In particular, we present the application of this system toward highly sensitive detection of the emerging pollutant ethinyl estradiol (EE2). The EPIA approach is based on the use of paper microzones modified with silica nanoparticles (SNs) and anti-EE2 specific antibodies for capture and preconcentration of EE2 from river water samples. After the preconcentration procedure, the paper microzones are placed onto a screen-printed carbon electrode modified with electrochemically reduced graphene (RG). The bound EE2 is subsequently desorbed adding a diluted solution of sulfuric acid on the paper microzones. Finally, recovered EE2 is electrochemically detected by OSWV. The proposed novel methodology showed an appropriate LOD and linear range for the quantification of EE2 for water samples with different origins. The nonsophisticated equipment required, the adequate recovery values obtained (from 97% to 104%, with a RSD less than 4.9%), and the appropriate LOD and linear range value (0.1 ng L–1and 0.5–120 ng L–1, respectively) achieved by our immunocapture sensor present significant analytical figures of merit, particularly when the routine quantification of EE2 is considered. In addition, our system was based on electrochemical paper-based technology, which allows obtainment of portable, easy-to-use, inexpensive, and disposable devices. The EPIA can also serve as a general-purpose immunoassay platform applicable to quantitation of other drugs and emerging pollutants in environmental samples.

Published
2024
Full Text
View/download PDF

84. Formation of ordered mesostructured TiO2 thin films: a soft coarse-grained simulation study.

Author

Tang, Qiyun, Angelomé, Paula C., Soler-Illia, Galo J. A. A., and Müller, Marcus

Abstract

Ordered mesostructured TiO2 thin films are employed in diverse applications ranging from catalysis and sensing, to photovoltaic and lithium-ion batteries. Experimentally these mesostructured thin films are fabricated via a sol–gel process coupled with evaporation-induced self-assembly of a supramolecular template, where the concentration of hydrogen chloride (HCl) and water play vital roles. We employ a soft, coarse-grained model of the amphiphilic template Brij58 and spherical particles, representing titanium–oxo clusters, to study the role of HCl and water in the formation of mesostructured TiO2 thin films. The template–cluster and cluster–cluster interactions are reflected in the interaction terms δNBP and εPP, respectively. The results show that a decrease in HCl (increase in εPP) leads to the formation of large mesopores due to the strong attraction between particles, giving rise to a high dispersity index (low order) of the thin films. However, a decrease in water (increase in δNBP) will compensate for the entropic attraction between particles, resulting in thin films with low dispersity index (high order). The variation of the dispersity index in the δNBP–εPP plane provides an intuitive understanding that the slow evaporation of HCl could drive the film towards a uniform mesoporous state, whereas fast evaporation pushes the film through a non-uniform phase. These results indicate that even if the mass proportion of the surfactants Brij58 and titanium precursors is the same in the initial solution, the final mesoporous structures could be diverse, which was confirmed by the controlled experiments. We also confirm the post-processing-towards-order strategy by making the particle rearrangement available by weakening the εPP. The outlined procedure paves the way for soft, coarse-grained models to understand the complex co-assembly of transition metal clusters and amphiphilic surfactants towards the rational design of highly ordered mesoporous structures. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

94. Au Nanoparticles–Mesoporous TiO2Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

Author

Zalduendo, M. Mercedes, Langer, Judith, Giner-Casares, Juan J., Halac, Emilia B., Soler-Illia, Galo J. A. A., Liz-Marzán, Luis M., and Angelomé, Paula C.

Abstract

The combination of plasmonic nanoparticles and mesoporous materials is of much interest in applications such as sensing or catalysis. The production of such hybrid materials can be done in various ways, leading to different architectures. We present a comparative study of the SERS performance of different nanocomposite architectures comprising mesoporous TiO2thin films and Au nanoparticles (NPs). The selection of TiO2as mesoporous support material was based on its high chemical and mechanical stability. Au NPs of different sizes and shapes were placed at different locations of the composite and used as a plasmonic material compatible with the synthesis conditions of the mesoporous films, displaying a high chemical stability. Using p-nitrothiophenol as a molecular probe, we evaluated the performance toward surface-enhanced Raman scattering (SERS) sensing, on the basis of minimum acquisition time, spot-to-spot reproducibility, and limit of detection. The obtained results indicate that each platform features different sensing capabilities. While systems comprising Au NPs within the mesopores allow working with low acquisition times and present high signal uniformity, only a detection limit of micromolar was achieved. On the other hand, those systems made of branched Au NPs covered with mesoporous films require low acquisition times and can achieve detection limits as low as 10 pM, but signal uniformity is compromised. We propose that careful comparison of different SERS platforms based on Au NPs and mesoporous thin films will facilitate selecting an appropriate configuration for any desired application.

Published
2018
Full Text
View/download PDF

98. Understanding the Zr and Si interdispersion in Zr1−xSixO2 mesoporous thin films by using FTIR and XANES spectroscopy.

Author

Andrini, Leandro, Angelomé, Paula C., Soler-Illia, Galo J. A. A., and Requejo, Félix G.

Subjects
ZIRCONIUM compounds, FOURIER transform infrared spectroscopy, X-ray absorption near edge structure, SMALL-angle X-ray scattering, MAGNETRON sputtering
Abstract

Zr–Si mixed mesoporous oxides were obtained in a wide range of proportions, from 0 to 30% and from 70 to 100% of Si, using Si(OEt)4 and ZrCl4 as precursors and Pluronic F127 as a template. The oxide mesostructure was characterized by transmission electron microscopy and 2D-small angle X-ray scattering. Fourier transform infrared spectroscopy measurements suggested a local homogeneous interdispersion of both cations. Further selective studies using X-ray Absorption Near Edge Structure (XANES) spectroscopy for separately Zr and Si local environments, allowed for demonstrating that the Zr coordination varies from close to 7 to 6, when its concentration in the mixed oxide is reduced. In addition, it was possible to determine that in mixed oxides with low Zr concentrations, Zr can fit into the spaces occupied by Si in SiO2 pure oxide. An equivalent XANES result was obtained for Si, which is also compatible with the information obtained by FTIR. Furthermore, the Zr–O distance varied from close to 2.2 Å to 1.7 Å when the Zr concentration decreased. Finally, our study also demonstrates the usefulness of XANES to selectively assess the local structure (coordination, symmetry and chemical state) of specific atoms in nanostructured systems. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results