Bibliographies thématiques / Supra-molecular Nanostructures

Littérature scientifique sur le sujet « Supra-molecular Nanostructures »

Auteur : Grafiati
Publié le 7 septembre 2023

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Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Supra-molecular Nanostructures ».

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Articles de revues sur le sujet "Supra-molecular Nanostructures"

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Baroncini, Massimo, Giulio Ragazzon, Serena Silvi, Margherita Venturi et Alberto Credi. « The eternal youth of azobenzene : new photoactive molecular and supramolecular devices ». Pure and Applied Chemistry 87, no 6 (1 juin 2015) : 537–45. http://dx.doi.org/10.1515/pac-2014-0903.

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AbstractThe development of multicomponent chemical systems that can perform predetermined functions under external control – i.e., molecular devices – is a challenging task in chemistry and a fascinating objective in the frame of a bottom-up approach to nanostructures. Photochromic units undergo profound changes in their chemical and/or electronic structure upon light excitation, and are highly interesting for the construction of photocontrollable molecular devices, machines and materials. The E–Z photoisomerization of azobenzene – owing to its high efficiency, excellent reversibility and significant physico-chemical differences between the two forms – is a highly useful reaction in this regard. Azobenzene photoisomerization has been known for almost 80 years and has been exploited to implement light-induced functionalities with a large variety of compounds, biomolecules, nanosystems and materials. Here we present some of our recent investigations highlighting how this outstanding photochrome can be utilized to develop (supra)molecular systems with valuable light-induced functionalities.
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Zhou, Huimin, Hao Wang, Wanli He, Zhou Yang, Hui Cao, Dong Wang et Yuzhan Li. « Research Progress of Cholesteric Liquid Crystals with Broadband Reflection ». Molecules 27, no 14 (11 juillet 2022) : 4427. http://dx.doi.org/10.3390/molecules27144427.

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Cholesteric liquid crystal (ChLC) materials with broadband reflection are witnessing a significant surge in interest due to their unique ability to self-organize into a helical supra-molecular architecture and their excellent selective reflection of light based on the Bragg relationship. Nowadays, by the virtue of building self-organized nanostructures with pitch gradient or non-uniform pitch distribution, extensive work has already been performed to obtain ChLC films with a broad reflection band. This critical review systematically summarizes the optical background of the ChLCs with broadband reflection characteristics, methods to obtain broadband reflection of ChLCs, as well as the application in this area. Combined with the research status and the advantages in the field, the challenges and opportunities of applied scientific problems in the research direction are also introduced.
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Pochylski, Mikolaj, Domenico Lombardo et Pietro Calandra. « Optical Birefringence Growth Driven by Magnetic Field in Liquids : The Case of Dibutyl Phosphate/Propylamine System ». Applied Sciences 10, no 1 (24 décembre 2019) : 164. http://dx.doi.org/10.3390/app10010164.

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Magnetically-induced birefringence is usually low in molecular liquids owing to the low magnetic energy of molecules with respect to the thermal one. Despite this, it has been found that a mixture of dibutyl phosphate and propylamine at propylamine molar ratio (X) around 0.33 surprisingly gives an intense effect (∆n/λ ≈ −0.1 at 1 Tesla). In this paper the time- and intensity- response to the magnetic field of such mixture have been studied. It was found that the reaction to the magnetic field is unusually slow (from several minutes to hours) depending of the magnetic field intensity. On the basis of the data, the model of orientable dipoles dispersed in a matrix enables to interpret the magnetic field-induced self-assembly in terms of soft molecules-based nanostructures. The analogy with systems made of magnetically polarizable (solid or soft) particles dispersed in liquid carrier allows understanding, at the microscopic scale, the molecular origin and the supra-molecular dynamics involved in the observed behavior. The data present a novel phenomenon in liquid phase where the progressive building up/change of ordered and strongly interacting amphiphiles is driven by the magnetic field.
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Nikoloudakis, Emmanouil, Emmanouil Orphanos, Eleni Agapaki, Vasilis Nikolaou, Asterios Charisiadis, Georgios Charalambidis, Anna Mitraki et Athanassios G. Coutsolelos. « Molecular self-assembly of porphyrin and BODIPY chromophores connected with diphenylalanine moieties ». Journal of Porphyrins and Phthalocyanines 24, no 05n07 (mai 2020) : 775–85. http://dx.doi.org/10.1142/s1088424619501864.

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In this study, a series of diphenylalanine tetra-substituted porphyrin derivatives were synthesized and their self-assembly ability was extensively studied. Apart from investigating the impact of incorporating many peptide moieties onto a porphyrin molecule; another perspective was investigated as well, namely the connection of two different chromophore entities (porphyrin and BODIPY) onto the same diphenylalanine molecule. Interestingly, various supra-molecular nanostructures were observed depending on the solvent mixture as well as the protecting group of the peptides, namely spheres, plaques and fibrils. The obtained self-assemblies were studied via UV-vis absorption and emission spectroscopies. Mainly red shifting was observed, indicating the formation of [Formula: see text]-aggregates in the self-assembled state. However, in one case a blue shifted UV-vis spectrum was obtained suggesting the formation of [Formula: see text]-type aggregates. Concerning the porphyrin-diphenylalanine-BODIPY derivative, additional fluorescence studies were performed in order to examine a possible interaction between the two chromophores in the excited state. Indeed, the emission measurements indicated that upon photo-excitation of the BODIPY entity, a very efficient energy or electron transfer process takes place from the BODIPY molecule to the porphyrin macrocycle.
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Wang, Manshi, Nan Zhang et Shih-Chi Chen. « Effects of supra-wavelength periodic structures on the formation of 1D/2D periodic nanostructures by femtosecond lasers ». Optics & ; Laser Technology 151 (juillet 2022) : 108058. http://dx.doi.org/10.1016/j.optlastec.2022.108058.

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Goodby, John William, Martin Bates, Isabel Saez, Ewa Gorecka, Heinz Kitzerow, Daniel Guillon, Bertrand Donnio, Jose-Luis Serrano et Robert Deschenaux. « Liquid Crystal Nanoparticles- LCNANOP : A SONSII Collaborative Research Project ». MRS Proceedings 1134 (2008). http://dx.doi.org/10.1557/proc-1134-bb09-04.

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AbstractLC-NANOP is an ESF EUROCORES SONS Collaborative Research Project that is addressing an innovative approach to self-organized nanostructures by combination of a variety of organic, inorganic and metal scaffolds with the unique self-organization properties of liquid crystals to obtain liquid crystal nano-particles. LC-NANOP is concerned with the synthesis, analysis, characterization, modeling and physico-chemical properties of super- and supra-molecular systems which are formed from a nano-particle as a central scaffold, surrounded by a layer of liquid crystal. The self-organization properties of the liquid crystal coating is the driving force leading to the self-assembly of the nano-particles into secondary or tertiary hierarchical structures, with emphasis on the systematic variation of nano-particle size, chirality, shape and functionality. This bottom-up approach to nano-structuring is very powerful as it combines the extraordinary variety of morphologies that liquid crystals present with the combination of functional entities, relevant for chemical, biological, optoelectronic, and photonic tasks, etc, to create ordered nano-structures that can be controlled by external stimuli.
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Doshi, D. A., N. HÜsing, H. Fan, A. J. Hurd et C. J. Brinker. « Nanostructural Lithography via Photo-Initiated Phase Transformation of Silica-Surfactant Assemblies ». MRS Proceedings 576 (1999). http://dx.doi.org/10.1557/proc-576-263.

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ABSTRACTCooperative self-assembly processes of inorganic species and amphiphilic molecules have experienced major advances over the past six years. The ability to design these materials with spatially controlled combinations of different mesophases or compositions, and therefore different properties, would greatly enhance their utility as nanofunctional surfaces.We present a simple lithographic procedure, which allows a deliberate control of structure and properties of a meso-ordered silica film through optical mediation. This nanostructural lithography process exploits the pH sensitivity of supra-molecular self-assembly which allows spatial control over mesophases in the thin film and a selective etching capability. Through the addition of a photoacid generator in the coating sol along with surfactant and silica source, dip coating results in continuous, ordered photosensitive films. Exposure to UV light through a mask produces local pH changes, inducing mesostructural phase transitions and an increase in the acidcatalyzed siloxane condensation rate in the exposed regions. Two surfactant systems, CTAB (CH3(CH2)15N+(CH3)3Br–) and Brij 56 (CH3(CH2)15(OCH2CH2)10OH) have been studied. X-ray diffraction, transmission and scanning electron microscopy, optical microscopy, ellipsometry, MAS-NMR and atomic force microscopy are used to characterize the patterned nanostructured surfaces.
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Wang, Zixin, et Hui Wang. « Au@C/Pt Core@Shell/Satellites Supra-Nanostructures : Plasmonic Antenna-Reactor Hybrid Nanocatalysts ». Nanoscale Advances, 2023. http://dx.doi.org/10.1039/d3na00498h.

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Integration of plasmonic nanoantennas with catalytically active reactors in deliberately designed hybrid supra-nanostructures creates a dual-functional materials platform, based upon which precise modulation of catalytic reaction kinetics becomes accomplishable through...
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Zhao, Ziyu, et Jinxing Liu. « On cyclic plasticity of nanostructured dual-phase CoCrFeNiAl high-entropy alloy : An atomistic study ». Journal of Applied Physics 132, no 16 (26 octobre 2022). http://dx.doi.org/10.1063/5.0111778.

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In this study, we have employed molecular dynamics simulations to examine plastic deformation mechanisms of a “supra-nanometer-sized dual-phase glass-crystal” (SNDP-GC) high-entropy alloy (HEA) composite under cyclic loadings. This composite is produced by embedding CoCrFeNi HEA crystalline grains into a softer CoCrFeNiAl2 HEA glass. Cyclic loadings of different amplitudes are applied on one polycrystalline CoCrFeNi sample and two SNDP-GC HEA samples mentioned above. For the polycrystalline sample, dislocation motion and grain boundary (GB)-mediated deformation control the plastic deformation process, and the sample loses its original structure after a few cycles of the set amplitude due to GB migration. However, for the two SNDP-GC samples, as the grain boundary is replaced by the metallic glass (MG) phase, the dominant plastic deformation mechanism has changed to concentrating shear transformation in the MG phase. Our results also show that structural stability is highly dependent on the MG phase thickness. For the sample with a thinner MG layer, MG cannot accommodate sufficient deformation—so voids are generated in it. However, for the sample with a thicker MG phase, MG can store adequate deformations, thus dislocation initiations in crystalline grains are reduced and void generation is prevented in the MG phase.
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Chapitres de livres sur le sujet "Supra-molecular Nanostructures"

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Vijayan, Jyothy G. « Design and Characterization of Smart Supramolecular Nanomaterials and their Biohybrids ». Dans Bio-Inspired Nanotechnology, 1–15. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815080179123010003.

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Over the past few years, much effort has been taken to explore the applications of nanoparticle-based structures in different fields such as nanomedicine, molecular imaging, etc.. Supramolecular analytical methods have attracted researchers due to their chemical formula, flexibility, convenience, and modularity for the synthesis of nanoparticles. The incorporation of functional ligands on the surface of supramolecular nanoparticles helps to improve their performance in many areas. Fabrication of supra molecular materials with uniform size gives more advantages of using them in different fields. Characterization techniques like positron emission tomography imaging (PET), magnetic resonance imaging (MRI), fluorescence studies, scanning electron microscopy (SEM), and UV-Vis studies help to identify the molecular images and structure effectively. Supramolecular systems are used as an effective technique in the nano-design of supramolecular nano-systems. They enhance the solubility, modification of surface properties, bioconjugation of nanoparticles due to the supramolecular recognition properties, and supramolecular materials that are applied for the removal of targeted molecules. The designing process makes it able to function in complex matrices. This chapter discusses the design, synthesis and characterization of supramolecular nanostructures and their hybrids and also discusses their application in different fields.
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Ahsan, Haseeb, Salman Ul Islam, Muhammad Bilal Ahmed, Adeeb Shehzad, Mazhar Ul Islam, Young Sup Lee et Jong Kyung Sonn. « Principles of Supra Molecular Self Assembly and Use of Fiber mesh Scaffolds in the Fabrication of Biomaterials ». Dans Biomaterial Fabrication Techniques, 218–42. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050479122010012.

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Tissue engineering techniques aim to create a natural tissue architecture using biomaterials that have all the histological and physiological properties of human cells to replace or regenerate damaged tissue or organs. Nanotechnology is on the rise and expanding to all fields of science, including engineering, medicine, diagnostics and therapeutics. Nanostructures (biomaterials) specifically designed to mimic the physiological signals of the cellular/extracellular environment may prove to be indispensable tools in regenerative medicine and tissue engineering. In this chapter, we have discussed biomaterial design from two different perspectives. Supramolecular self-assembly is the bottom-up approach to biomaterials design that takes advantage of all the forces and interactions present in biomolecules and are responsible for their functional organization. This approach has the potential for one of the greatest breakthroughs in tissue engineering technology because it mimics the natural, complex process of coiling and folding biomolecules. In contrast, a fiber mesh scaffold is a top.down approach in which cells are seeded. The scaffolds form the cellular scaffold while the cells produce and release the desired chemical messengers to support the regeneration process. Therefore, both techniques, if efficiently explored, may lead to the development of ideal biomaterials produced by self-assembly or by the fabrication of optimal scaffolds with long shelf life and minimal adverse reactions.
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« The Role of H-Bonding Interactions (and Supra Molecular Nanostructures Formation) in the Mechanisms of Homogenous and Enzymatic Catalysis by Iron (Nickel) Complexes ». Dans Physical Chemistry Research for Engineering and Applied Sciences, Volume Three, 87–124. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b18297-16.

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