7 results on '"Vincenti, M.A."'
Search Results
2. Influence of a Solid Surface on PNIPAM Microgel Films.
- Author
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Nigro, Valentina, Angelini, Roberta, Buratti, Elena, Colantonio, Claudia, D'Amato, Rosaria, Dinelli, Franco, Franco, Silvia, Limosani, Francesca, Montereali, Rosa Maria, Nichelatti, Enrico, Piccinini, Massimo, Vincenti, Maria Aurora, and Ruzicka, Barbara
- Subjects
MICROGELS ,ATOMIC force microscopy ,THIN films ,ELECTROSTATIC interaction ,CELL growth - Abstract
Stimuli-responsive microgels have attracted great interest in recent years as building blocks for fabricating smart surfaces with many technological applications. In particular, PNIPAM microgels are promising candidates for creating thermo-responsive scaffolds to control cell growth and detachment via temperature stimuli. In this framework, understanding the influence of the solid substrate is critical for tailoring microgel coatings to specific applications. The surface modification of the substrate is a winning strategy used to manage microgel–substrate interactions. To control the spreading of microgel particles on a solid surface, glass substrates are coated with a PEI or an APTES layer to improve surface hydrophobicity and add positive charges on the interface. A systematic investigation of PNIPAM microgels spin-coated through a double-step deposition protocol on pristine glass and on functionalised glasses was performed by combining wettability measurements and Atomic Force Microscopy. The greater flattening of microgel particles on less hydrophilic substrates can be explained as a consequence of the reduced shielding of the water–substrate interactions that favors electrostatic interactions between microgels and the substrate. This approach allows the yielding of effective control on microgel coatings that will help to unlock new possibilities for their application in biomedical devices, sensors, or responsive surfaces. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Keratin–PNIPAM Hybrid Microgels: Preparation, Morphology and Swelling Properties.
- Author
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Buratti, Elena, Sguizzato, Maddalena, Sotgiu, Giovanna, Zamboni, Roberto, and Bertoldo, Monica
- Subjects
MICROGELS ,SWELLING of materials ,BIOCOMPATIBILITY ,NANOTECHNOLOGY ,HYDROGELS - Abstract
Combinations of synthetic polymers, such as poly(N-isopropylacrylamide) (PNIPAM), with natural biomolecules, such as keratin, show potential in the field of biomedicine, since these hybrids merge the thermoresponsive properties of PNIPAM with the bioactive characteristics of keratin. This synergy aims to produce hybrids that can respond to environmental stimuli while maintaining biocompatibility and functionality, making them suitable for various medical and biotechnological uses. In this study, we exploit keratin derived from wool waste in the textile industry, extracted via sulfitolysis, to synthesize hybrids with PNIPAM microgel. Utilizing two distinct methods—polymerization of NIPAM with keratin (HYB-P) and mixing preformed PNIPAM microgels with keratin (HYB-M)—resulted in hybrids with 20% and 25% keratin content, respectively. Dynamic light scattering (DLS) and transmission electron microscopic (TEM) analyses indicated the formation of colloidal systems with particle sizes of around 110 nm for HYB-P and 518 nm for HYB-M. The presence of keratin in both systems, 20% and 25%, respectively, was confirmed by spectroscopic (FTIR and NMR) and elemental analyses. Distinct structural differences were observed between HYB-P and HYB-M, suggesting a graft copolymer configuration for the former hybrid and a complexation for the latter one. Furthermore, these hybrids demonstrated temperature responsiveness akin to PNIPAM microgels and pH responsiveness, underscoring their potential for diverse biomedical applications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Optical Second Harmonic Generation of Low-Dimensional Semiconductor Materials.
- Author
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Fu, Yue, Liu, Zhengyan, Yue, Song, Zhang, Kunpeng, Wang, Ran, and Zhang, Zichen
- Subjects
SECOND harmonic generation ,SEMICONDUCTOR materials ,NONLINEAR optical materials ,OPTICAL properties ,CRYSTAL symmetry - Abstract
In recent years, the phenomenon of optical second harmonic generation (SHG) has attracted significant attention as a pivotal nonlinear optical effect in research. Notably, in low-dimensional materials (LDMs), SHG detection has become an instrumental tool for elucidating nonlinear optical properties due to their pronounced second-order susceptibility and distinct electronic structure. This review offers an exhaustive overview of the generation process and experimental configurations for SHG in such materials. It underscores the latest advancements in harnessing SHG as a sensitive probe for investigating the nonlinear optical attributes of these materials, with a particular focus on its pivotal role in unveiling electronic structures, bandgap characteristics, and crystal symmetry. By analyzing SHG signals, researchers can glean invaluable insights into the microscopic properties of these materials. Furthermore, this paper delves into the applications of optical SHG in imaging and time-resolved experiments. Finally, future directions and challenges toward the improvement in the NLO in LDMs are discussed to provide an outlook in this rapidly developing field, offering crucial perspectives for the design and optimization of pertinent devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
5. Efficient Third Harmonic Generation from Magnetic Resonance in Low-Index Dielectric Nanopillars.
- Author
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Xie, Rui, He, Xiaobo, Wang, Wenqiang, Zheng, Liren, and Shi, Junjun
- Subjects
THIRD harmonic generation ,MAGNETIC resonance ,DIELECTRICS ,HARMONIC generation ,MIE scattering - Abstract
Boosting the harmonic generation of light in nanostructures through efficiently enhancing the light–matter interaction has received enormous attention and applications. Low-index dielectric nanoparticles, as one of the crucial members of nanophotonics, have not been successful in nonlinear enhancement due to weak Mie resonance and poor light confinement. Here, we designed efficient third harmonic generation (THG) in low-index dielectric nanopillars sandwiched by double layers of metal dressing (Au/polymer/Au), where the polymer offers essential nonlinear susceptibility. The resonance of the low-index nanopillars significantly enhanced the scattering and had a strong magnetic response that could boost the THG effect. We predict that the THG efficiency reaches up to 3 × 10
−6 (six orders of enhancement) at a third harmonic wavelength of 300 nm. The efficient THG in low-index dielectric nanopillars may open the possibility for the development of a new type of efficient nonlinear coherent source. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
6. Using Thin Films of Phase-Change Material for Active Tuning of Terahertz Waves Scattering on Dielectric Cylinders.
- Author
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Cakmak, Atilla Ozgur, Colak, Evrim, and Serebryannikov, Andriy E.
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SUBMILLIMETER waves ,PHASE change materials ,TERAHERTZ materials ,THIN films ,ELECTROMAGNETIC wave scattering ,ELECTROMAGNETIC shielding - Abstract
The scattering of electromagnetic waves by isotropic dielectric cylinders can be dramatically modified by means of vanadium dioxide ( VO 2 ) thin-film coatings. Efficient dynamic control of scattering is achieved due to the variations in material parameters realizable by means of external biasing. In this paper, we study the scattering of terahertz waves in a case where the coating shells are made of VO 2 , a phase-change material, whose thin films may work rather as electromagnetic phase screens in the insulator material phase, but as lossy quasi-metallic components in the metallic material phase. The shells that uniformly cover the dielectric cylinders are investigated. Attention will be paid to the demonstration of the potential of VO 2 in the external control of diverse scattering regimes of the dielectric- VO 2 core–shell scatterer, while conductivity of VO 2 corresponds to rather insignificant variations in temperature. In line with the purposes of this work, it is shown that the different resonant and nonresonant regimes have different sensitivity to the variations in VO 2 conductivity. Both the total scattering cross section and field distributions inside and around the core are studied, as well as the angle-dependent scattering cross section. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. Bio-Inspired Information Pathways : From Neuroscience to Neurotronics
- Author
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Martin Ziegler, Thomas Mussenbrock, Hermann Kohlstedt, Martin Ziegler, Thomas Mussenbrock, and Hermann Kohlstedt
- Subjects
- Electronics, Neural networks (Computer science), Neural computers, Nanoelectromechanical systems, Neurotechnology (Bioengineering)
- Abstract
This open access book offers a timely and comprehensive review of the field of neurotronics. Gathering cutting-edge contributions from neuroscientists, biologists, psychologists, as well as physicists, microelectronics engineers and information scientists, it gives extensive information on fundamental information pathways in selected nervous systems. It also highlights their relevance as building blocks for novel computing architectures, such as bio-inspired electronic devices, neuromorphic architectures, memristive devices, adaptive sensors and emergent, pulsed-coupled oscillatory networks. All in all, this book offers a unique bridge between fundamental research in neuroscience, neural information processing, nonlinear dynamics, and self-organization, and advanced practical applications concerning the fabrication of hardware-oriented computing.
- Published
- 2024
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