Готові списки джерел за темами / Sol-gel approach

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Добірка наукової літератури з теми "Sol-gel approach"

Автор: Grafiati
Опубліковано: 23 червня 2022

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Статті в журналах з теми "Sol-gel approach"

1

Wu, Hwai Chung, and Peijiang Sun. "On sol-gel approach to geopolymerisation." International Journal of Environmental Engineering 3, no. 2 (2011): 103. http://dx.doi.org/10.1504/ijee.2011.039449.

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2

Belleville, Philippe. "Functional coatings: The sol-gel approach." Comptes Rendus Chimie 13, no. 1-2 (January 2010): 97–105. http://dx.doi.org/10.1016/j.crci.2009.12.005.

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3

Seddon, A. B., S. N. B. Hodgson, and M. G. Scott. "Sol-gel approach to preparing germanium disulphide." Journal of Materials Science 26, no. 10 (May 1991): 2599–602. http://dx.doi.org/10.1007/bf02387724.

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4

Safaryan, Sofia M., Aleksandr V. Yakovlev, Evgeny A. Pidko, Alexandr V. Vinogradov, and Vladimir V. Vinogradov. "Reversible sol–gel–sol medium for enzymatic optical biosensors." Journal of Materials Chemistry B 5, no. 1 (2017): 85–91. http://dx.doi.org/10.1039/c6tb02559e.

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In this paper we for the first time report a reversible sol–gel–sol approach to obtain optical enzymatic biosensors with improved enzyme stability and good sensitivity by using desktop inkjet printing.
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5

Sacco, Hérica C., Katia J. Ciuffi, Juliana C. Biazzotto, Cesar Mello, Daniela C. de Oliveira, Ednalva A. Vidoto, Otaciro R. Nascimento, Osvaldo A. Serra, and Yassuko Iamamoto. "Ironporphyrins trapped sol–gel glasses: a chemometric approach." Journal of Non-Crystalline Solids 284, no. 1-3 (May 2001): 174–82. http://dx.doi.org/10.1016/s0022-3093(01)00398-2.

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6

Zhao, Lan, Dao Li Zhang, Gang Du, Jian Mei Xu, and Dong Xiang Zhou. "The Properties of Antimony-Doped Tin Oxide Thin Films by the Sol-Gel Approach." Key Engineering Materials 280-283 (February 2007): 831–34. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.831.

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Antimony-doped tin oxide thin films have a range of technical applications as conductive coatings, and sol-gel processing seems to offer some advantages over other coating techniques. In this study, the sol was prepared by sol-gel approach from SnO2·H2O and SbCl3 in alcohol. It was found that the heat-treatment temperature and doping level have strong influences on the microstructure and composition of Sb: SnO2 films. The SnO2 crystals exist mainly as tetragonal rutile structure. The optimum heat-treatment temperature is about 450 ~ 500°C, and the film is composed with nanocrystals and nano-pores. Microstructure and the electrical behaviors of Sb-doped SnO2 thin films derived by sol-gel process were investigated.
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7

Duan, Zhiying, Zhichao Wang, Chufeng Sun, Lianbiao Zhao, and Yanbin Wang. "Facile synthesis of AC@TiO2-S with improved visible light photocatalytic activity and recyclability through a controllable sol–gel approach." RSC Advances 5, no. 70 (2015): 56808–14. http://dx.doi.org/10.1039/c5ra07020a.

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Анотація:
AC@TiO2-S prepared by controlled sol–gel approach exhibits improved photocatalytic activity over AC@TiO2-G prepared by sol–gel approach for the degradation of methyl orange under visible light irradiation and has excellent recyclability.
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Lim, Eun Seob, Min-Cheol Lim, Kisang Park, Gaeul Lee, Jeong-A. Lim, Min-Ah Woo, Nari Lee, Sung-Wook Choi, and Hyun-Joo Chang. "Selective Binding and Elution of Aptamers for Pesticides Based on Sol-Gel-Coated Nanoporous Anodized Aluminum Oxide Membrane." Nanomaterials 10, no. 8 (August 5, 2020): 1533. http://dx.doi.org/10.3390/nano10081533.

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Sol-gel-based mesopores allow the entry of target small molecules retained in their cavity and aptamers to bind to target molecules. Herein, sol-gel-based materials are applied to screen-selective aptamers for small molecules, such as pesticides. To enhance the efficiency of aptamer screening using a sol-gel, it is necessary to increase the binding surface. In this study, we applied the sol-gel to an anodized aluminum oxide (AAO) membrane, and the morphological features were observed via electron microscopy after spin coating. The binding and elution processes were conducted and confirmed by fluorescence microscopy and polymerase chain reaction. The sol-gel coating on the AAO membrane formed a hollow nanocolumn structure. A diazinon-binding aptamer was bound to the diazinon-containing sol-gel-coated AAO membrane, and the bound aptamer was effectively retrieved from the sol-gel matrix by thermal elution. As a proof of concept, a sol-gel-coated AAO disc was mounted on the edge of a pipette tip, and the feasibility of the prepared platform for the systematic evolution of ligands by exponential enrichment (SELEX) of the aptamer binding was also confirmed. The proposed approach will be applied to an automated SELEX cycle using an automated dispenser, such as a pipetting robot, in the near future.
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Armelao, Lidia, Davide Barreca, Gregorio Bottaro, Alberto Gasparotto, Eugenio Tondello, Matteo Ferroni, and Stefano Polizzi. "Au/TiO2Nanosystems: A Combined RF-Sputtering/Sol−Gel Approach." Chemistry of Materials 16, no. 17 (August 2004): 3331–38. http://dx.doi.org/10.1021/cm0353308.

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Gado, Emanuela Del, Lucilla de Arcangelis, and Antonio Coniglio. "A percolation dynamic approach to the sol-gel transition." Journal of Physics A: Mathematical and General 31, no. 8 (February 27, 1998): 1901–10. http://dx.doi.org/10.1088/0305-4470/31/8/004.

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Дисертації з теми "Sol-gel approach"

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Vinogradov, A. V., and V. V. Vinogradov. "Low-temperature Sol-gel Approach for Creating New Functional Nanomaterials." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35209.

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Анотація:
It is well-known that production of a crystal matrix is as a rule accompanied by using hightemperature processing which considerably limits the area of applied use of the objects. In the present work, we consider new approaches aimed at formation of crystalline highly active oxide phases without using annealing stage by achieving deep intercomponent penetration of disperse particles at the nanolevel during the sol-gel process reactions. The use of these approaches was possible in a single stage for the first time: 1) entrapment of various biological objects in a ceramic biocompatible matrix necessary for obtaining vaccines of new generation; 2) doping a crystal lattice up to 10at. % usingsoft chemistry method; 3) chemical modification of biopolymers for the purpose of developing high-level operational characteristics. In this work, trends in forming crystals from solutions for existing ceramic matrices are analyzed for the first time. The main objects of study are materials of modified titania and alumina. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35209
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Morigi, Francesca. "A green approach to mesoporous silica particles synthesis by sol-gel chemistry." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13434/.

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Анотація:
Mesoporous silica materials have a wide variety of applications in different sectors depending on their characteristic porosity, particle dimensions and functionalization. They are used as heterogeneous catalyst agents in industrial synthesis, stationary phase in chromatography or in biomedical applications as drug delivery systems. Consequently a significant number of studies have focused on the development of preparation methods that allow the regulation of the pore size and pore morphology of the silica. This thesis work, conducted at UCC (University College Cork, Ireland), aims to find a “greener” path than the one traditionally used to synthesize good quality mesoporous silica particles. It is a preliminary work whose purpose is to determine if it can be considered viable to start further systematic research in this direction. Nowadays it is impossible to ignore the need of an environmentally sustainable approach towards chemical synthesis and processes design. Green Chemistry and its Twelve Principles are central to the development of the mesoporous silica material preparation procedure utilized within this research. A modified Stöber sol-gel method of synthesis was chosen for its intrinsically green features: it is a batch process, the reaction takes place at room temperature and one of the main solvents is water. This study focuses on changing those aspects of the “standard” procedure which are not so environmentally friendly: the second solvent (alcohol), the surfactant (most commonly CTAB) and the post synthesis hydrothermal treatment. In particular Sodium Alginate, a polysaccharide extracted from the cell wall of brown seaweed, is the surfactant of choice. Until now no works have been reported on the use of alginate as a direct anionic surfactant template. Characterization of obtained silica particles was performed employing N2 sorption for information about porosity and SEM and TEM imaging to evaluate particles aggregation, aspect and size.
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Winkler, Robert. "Developement of an "all-in-one" approach for the synthesis of silica-based hybrid materials." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS075.

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Анотація:
Ce travail de thèse porte sur la synthèse de nouveaux précurseurs d'organosilane et leur utilisation dans des matériaux hybrides à base de silice par une approche tout-en-un pour l'extraction de terres rares.Pour atteindre cet objectif, cinq précurseurs d'organosilane ont été synthétisés avec un bon rendement. Premièrement, ces nouveaux précurseurs ont été utilisés pour élaborer des matériaux hybrides à base de silice dense (SHM). La caractérisation de la structure locale par FTIR et de la mésostructure par SAXS du SHM final a permis de mettre en évidence le lien entre les interactions chimiques et physiques entre les groupes fonctionnels des précurseurs et les autres espèces présentes dans le mélange réactionnel qui déterminent la connectivité locale du réseau siloxane et la mésostructure des matériaux obtenus (phases lamellaire et hexagonale 2D). Deuxièmement, afin d'améliorer les propriétés du matériau, une approche innovante en deux étapes a été proposée. La première étape est basée sur la structuration de mélanges binaires alcool/eau afin d’influencer le comportement à l’agrégation des nanoparticules de silice préparé à partir de tétraéthyl orthosilicate. Ainsi, une surface spécifique remarquable de 2000 m² g-1 a pu être obtenue. Dans une seconde étape, les conditions de réaction conduisant aux matériaux ayant la plus grande surface spécifique ont été utilisées avec l’addition d’un précurseur d’organosilane synthétisé ne présentant pas de groupe fonctionnel générant de forte interaction physico-chimique. Les résultats montrent le potentiel de cette approche pour adapter les propriétés des matériaux obtenus. Enfin, les SHM synthétisés à partir de précurseurs d'organosilane purs ont été testés avec succès pour l'extraction sélective et efficace d'éléments tel que des terres rares présents dans un lixiviat modèle d’aimant NdFeB.Ces travaux offrent des perspectives prometteuses pour la synthèse « tout-en-un » de SHM à applications directes
In this work, we investigated the synthesis of new organosilane precursors and their polymerization to silica hybrid materials with REE extracting properties via an all-in-one approach.To reach this goal, five organosilane precursors were synthetized in good yield. First, these new precursors were used to elaborate dense silica hybrid materials (SHM). The characterization of the local structure by FTIR and of the mesostructure by SAXS of the SHMs highlighted the link between the chemical and physical interactions between the headgroups of the precursors and the others species existing in the reaction mixture. These interactions drive the local connectivity of the siloxane network and the mesostructure of the obtained materials (lamellar and 2D hexagonal phases). Second, in order to improve the material properties, an innovative approach in two steps was proposed. The first step was based on the structuring of binary alcohol/water mixtures to influence the aggregation behavior of silica nanoparticles prepared from tetraethyl orthosilicate (TEOS). Here, a remarkable specific surface area of 2000 m2 g-1 was achieved. In a second step, the reaction conditions that lead to materials with the highest specific surface area were used in combination with the synthesized organosilane precursors. The results show the potential of this approach to tailor the properties of the obtained materials. Finally, the SHMs synthesized from the pure organosilane precursors were successfully tested for the selective and efficient extraction of rare earth elements present in a simulated leachate of NdFeB magnets.This work offers promising prospects for the "all-in-one" synthesis of SHMs with direct applications
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Betrabet, Chinmay Suresh. "Inorganic-organic hybrid materials and abrasion resistant coatings based on a sol-gel approach." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40188.

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Novel inorganic-organic hybrid materials made previously in the laboratory have utilized acids catalysts such as HCI, acetic acid, toluene sulfonic acid and polystyrene sulfonic acid to catalyze the sol-gel reaction. The sol-gel reaction can also be catalyzed under near neutral (i.e. 5 < pH < 7) and basic conditions. The effects of synthesizing hybrid materials under near basic and basic conditions has not been studied. Attempts to synthesize hybrid materials from polytetramethylene oxide (PTMO) end functionalized with triethoxy silyl groups and, tetraethylorthosilicate (TEOS) under basic conditions met with only partial success. The films obtained had low mechanical stability. This was attributed to the low reactivity of the triethoxy species under neutral and basic conditions. In contrast, films with good mechanical stability were obtained when the TEOS was replaced with titanium tetraisopropoxide (TIOPR). The microstructure of the TIOPRlPTMO hybrid synthesized under near neutral conditions was generally similar to the acid catalyzed PTMOffIOPR hybrids.
Ph. D.
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5

Faustini, Marco. "Nanopatterning through bottom-up approach : an alternative way for data storage devices." Paris 6, 2011. http://www.theses.fr/2011PA066286.

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Ces travaux de thèse ont consisté à développer de nouveaux systèmes pour le stockage magnétique de données en utilisant une méthode non-lithographique, peu chère et facilement transposable à l’échelle industrielle. Pour ce faire, des films céramiques nanoperforés ont été préparés à partir de solutions sol-gel et de copolymères à blocs permettant l’organisation de la matrice inorganique en utilisant la technique de dépôt « trempage/retrait ». La composition des solutions et les paramètres de dépôts ont été étudiés et optimisés de manière à contrôler les paramètres structuraux des films nanoperforés (diamètre des perforations, distance entre les perforations, etc. ). Une texturation micrométrique peut ensuite être ajoutée à la texturation nanométrique des films par l’utilisation de la lithographie rayons X ; la profondeur des perforations peut être, elle, contrôlée par gravure physique. Les nanostructures obtenus on été utilisée comme substrat pour le dépôt de matériaux magnétiques. Le système le plus prometteur constitué de nanoplots entourés par un film continu et présentant une anisotropie magnétique perpendiculaire on été obtenus en déposant des multicouches Co/Pt par pulvérisation. Les nanoperforations servent de point d’ancrage aux domaines magnétiques et peuvent être utilisées pour créer des nouveaux dispositifs permettant le stockage des données. La méthodologie développée pour la préparation de films nanostructures a également été appliquée à la préparation de matériaux pour application optique et pour la réalisation de dispositifs nanofluidiques
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Brown, Kimberly Ann. "An analysis of a new approach to sol-gel synthesis the reaction of formic acid with TEOS /." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2979.

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Анотація:
Thesis (Ph. D.) -- University of Maryland, College Park, 2005.
Thesis research directed by: Chemical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Brown, Michael Edward. "APPROACHES TO MOLECULAR IMPRINTING ON POLYSILOXANE SCAFFOLDS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/469.

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Molecular imprinting, a common method used in separations and chromatography to isolate specific molecules via surface binding, has been adapted for applications in biomaterials and related sciences. The objective of this study was to determine the effectiveness of different approaches to molecular imprinting by testing for preferential binding of protein on polysiloxane scaffold surfaces. To test preferential rebinding, the scaffolds were exposed to a mixture of the template protein and a competitor protein with similar size but different chemistry. Lysozyme-imprinted polymers rebound 8.13 0.99% of lysozyme without any competition and 5.1 0.3% of the protein during competition. Lysozyme C peptide was imprinted into polysiloxane scaffolds to investigate the epitope approach to molecular imprinting. Without competition, 8.95 11.53% of the lysozyme preferentially bound to the scaffolds, while under competition 1.85 9.47% bound to the scaffolds. Lastly, bone morphogenetic protein 2 (BMP-2) was imprinted into the polymer scaffolds. Results revealed that BMP-2 imprinted scaffolds bound 10.09 6.625% under noncompetitive conditions and a very small 0.65 4.55% during competition. Trends of preferential binding via peptide imprinting and BMP-2 imprinting can be seen, and show promise in future tissue engineering material applications and biomaterial compatibility.
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Cerqueira, Andreia Filipa Lages. "Evaluation of bioactive coatings for titanium surfaces: a proteomic approach." Doctoral thesis, Universitat Jaume I, 2022. http://dx.doi.org/10.6035/14112.2022.779425.

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Titanium is among the most commonly used metals as a standard treatment for bone defects. Despite its excellent mechanical and biocompatibility properties, Ti is relatively bioinert and surface modifications are necessary to improve its bioactivity. The sol-gel process allows this modification through the development of coatings with controlled release of bioactive compounds. On the other hand, the growing demand for biomaterials with better performances created the need to develop new in vitro methods more predictive of in vivo results. Considering this, the application of proteomics represents an interesting alternative to be explored. Herewith, the present doctoral thesis aimed to develop sol-gel coatings doped with different bioactive compounds and its characterization employing proteomics to determine predictive biomarkers of possible in vivo results.
Programa de Doctorat en Ciències Biomèdiques i Salut
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9

Kümmel, Monika. "Nanocraters : a bottom-up approach towards heterogeneous inorganic nanopatterns by copolymer templated chemical solution deposition." Paris 6, 2008. http://www.theses.fr/2008PA066324.

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Des motifs nanométriques d’oxydes métalliques (TiO2, Al2O3, ZrO2) étaient synthétisés avec une technique bottom-up. Un mélange de précurseurs moléculaires et de micelles préformées des copolymères à block est déposé sur des substrats tels que la silice, l’or ou l’ITO par voie de trempage. Des monocouches de micelles entourées par les espèces inorganiques sont deposées à des concentrations et des vitesses de dépôt faibles. Calcination élimine les copolymères et des motifs (perforations rondes, canaux, anneaux,…) rigides d’oxyde métallique sont obtenus. La présence de monocouches de perforations d’un diamètre entre 10 et 70nm ainsi que l’accessibilité de la surface du substrat a travers ces perforations a été confirme avec plusieurs méthodes de caractérisation. Les dessins du type nanocrateres sont bifunctionels, peuvent être functionalisé sélectivement et ont une bonne stabilité mécanique, thermique et chimique ce qui fait que ces matériaux sont intéressants pour plusieurs applications
Metal oxide nanopatterns (TiO2, Al2O3, ZrO2) were synthesised with a bottom up technique that combines the method of chemical solution deposition and the self-organisation properties of block copolymer micelles on a substrate surface through Evaporation Induced Micelle Packing (EIMP). Molecular precursors were mixed with micelles in EtOH/THF/H2O or EtOH/THF and the solutions were dip coated onto various substrates such as silicon wafers, gold or ITO. High dilution and low withdrawal speed lead to the deposition of micelle monolayers surrounded by inorganic precursors. A calcination step eliminates the block copolymer and rigid metal oxide nanopatterns with various motifs like circular perforations (nanocraters), channels or rings are obtained. The size and kind of the motifs can be controlled by adjusting several crucial parameters during solution preparation like the kind and size of the used block copolymer in combination with the used solvent composition, concentration and conditioning. High kinetics of evaporation during the dip coating further allow ordering of nanocrater perforations in hexagonal patterns. The synthesised patterns were characterised by ellipsometry, AFM, FEG-SEM, GISAXS, XPS, cyclic voltametry and contact angle measurements. The presence of monolayers of perforations with diameters of 10-70nm and accessibility of the substrate surface through the perforations was confirmed. Nanocrater patterns show inherent bifunctionality and the substrate surface and the pattern can be selectively functionalised. In addition, nanocrater patterns are mechanically, chemically and thermally stable and are therefore interesting materials for various kinds of applications
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Fleury, Joachim. "Développement de phases stationnaires monolithiques pour la chromatographie en phase gazeuse miniaturisée ultra-rapide." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066652.

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La miniaturisation des systèmes conventionnels de chromatographie en phase gazeuse (CPG) est d’un intérêt majeur pour de nombreuses applications. L'objectif est d'aboutir à des améliorations des systèmes existants, en termes de portabilité et d’autonomie, mais aussi en termes de durée d’analyse et de coût. In fine, ces systèmes miniaturisés de CPG pourraient être utilisés directement sur le terrain pour de l’analyse en continu presque en temps réel. Dans ce contexte, ce projet de thèse a consisté à développer des phases stationnaires monolithiques à base de silice afin de séparer, de manière ultra-rapide, des composés très volatils tels que des alcanes légers C1-nC5. Dans une première partie, la synthèse d’un monolithe de silice in situ dans des capillaires de 75 µm d.i. a été optimisée via une approche sol-gel de manière à adapter la perméabilité, et donc la structure macroporeuse des matériaux aux écoulements gazeux. Nous avons pu ainsi obtenir, pour la première fois, des séparations rapides C1-nC5 en CPG à des pressions conventionnelles en tête de colonne (Pin < 4 bar). Le second volet de cette thèse a consisté à optimiser et contrôler l’état de surface des monolithes par l’élaboration de deux traitements post-synthèse différents ayant pour objectif l’élimination du porogène organique résiduel. Des séparations C1-nC5 ultra-rapides (à l’échelle de quelques secondes) à haute température et en régime isotherme ont pu être obtenues en raison de la rétention et de l’efficacité élevées des matériaux. Enfin, le rendement, la répétabilité et la reproductibilité de la synthèse des monolithes de silice ont été étudiés afin d’évaluer leur potentielle fabrication à grande échelle
The miniaturization of conventional gas chromatography (GC) systems is of major interest for many applications. The aim is to achieve improvements in existing systems, in terms of portability and autonomy, but also in terms of analysis time and cost. Ultimately, these miniaturized GC systems could be field-portable for near real-time continuous monitoring. In this context, this PhD project consisted in developing silica-based monolithic stationary phases in order to obtain ultra-fast separation of very volatile compounds such as C1-nC5 light alkanes. First of all, in situ synthesis of a silica monolith in capillaries of 75 μm i.d. has been optimized via a sol-gel approach in order to adapt the permeability, and therefore the macroporous structure of the materials, for gas flows. For the first time, fast C1-nC5 separations were obtained at conventional column inlet pressures (Pin < 4 bar). The second part of this PhD project consisted in optimizing and controlling the surface state of the monoliths by the development of two different post-synthesis treatments with the objective of eliminating the residual organic porogen. Ultra-fast C1-nC5 separations (at a few seconds) at high temperature and isothermal conditions were achieved due to the high retention and efficiency of the materials. Finally, the yield, repeatability and reproducibility of silica monoliths synthesis were studied in order to evaluate their potential large-scale production
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Частини книг з теми "Sol-gel approach"

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Beganskiene, Aldona, Zivile Stankeviciute, Milda Malakauskaite, Irma Bogdanoviciene, Valdek Mikli, Kaia Tõnsuaadu, and Aivaras Kareiva. "Sol-Gel Approach to the Calcium Phosphate Nanocomposites." In Nanostructured Materials and Nanotechnology VII, 1–13. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118807828.ch1.

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Starodub, Nikolai F., and German M. Telbiz. "Sol-Gel Approach for Development of the Mesoporous Structures for Creation of the Sensors and Disposal of Low Molecular Weight Toxic Substances from Environmental Objects." In Sol-Gel Methods for Materials Processing, 447–52. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8514-7_41.

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3

Dimesso, Lucangelo. "Pechini Processes: An Alternate Approach of the Sol–Gel Method, Preparation, Properties, and Applications." In Handbook of Sol-Gel Science and Technology, 1–22. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-19454-7_123-1.

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Dimesso, Lucangelo. "Pechini Processes: An Alternate Approach of the Sol-Gel Method, Preparation, Properties, and Applications." In Handbook of Sol-Gel Science and Technology, 1067–88. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-32101-1_123.

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Wilkes, Garth L., Hao-Hsin Huang, and Raymond H. Glaser. "New Inorganic—Organic Hybrid Materials Through the Sol—Gel Approach." In Advances in Chemistry, 207–26. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/ba-1990-0224.ch012.

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6

Wang, J., M. Tang, F. Zhang, Zhao Xian Xiong, and J. H. Zhou. "Modification of Optical Waveguide Material PMMA with Nano-Silicon by Sol-Gel Approach." In Key Engineering Materials, 549–51. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.549.

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7

Baumann, Theodore F., Alexander E. Gash, and Joe H. Satcher. "A Robust Approach to Inorganic Aerogels: The Use of Epoxides in Sol–Gel Synthesis." In Aerogels Handbook, 155–70. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-7589-8_8.

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8

Zhao, Lan, Dao Li Zhang, Gang Du, Jian Mei Xu, and Dong Xiang Zhou. "The Properties of Antimony-Doped Tin Oxide Thin Films by the Sol-Gel Approach." In High-Performance Ceramics III, 831–34. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.831.

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Venugopal, S., A. Paul, B. Vaidhyanathan, J. Binner, A. Heaton, and P. Brown. "Nano-Crystalline Ultra High Temperature HfB2 and HfC Powders and Coatings using a Sol-Gel Approach." In Advanced Ceramic Coatings and Materials for Extreme Environments, 151–59. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118095232.ch13.

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Arkhireeva, Anna, and John N. Hay. "Synthesis of Styryl- and Methacryloxypropyl-Modified Silica Particles Using the Hydrolytic Sol-Gel Method and the Miniemulsion Polymerization Approach." In ACS Symposium Series, 348–67. Washington, DC: American Chemical Society, 2007. http://dx.doi.org/10.1021/bk-2007-0964.ch022.

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Тези доповідей конференцій з теми "Sol-gel approach"

1

Buta, F. "A Sol-Gel Approach to the Insulation of Rutherford Cables." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference - ICMC. AIP, 2004. http://dx.doi.org/10.1063/1.1774579.

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2

del Monte, Francisco, Gonzalo Ramos, Tomas Belenguer, and David Levy. "Sol-gel approach for the preparation of holographic and photorefractive materials." In International Symposium on Optical Science and Technology, edited by Klaus Meerholz. SPIE, 2002. http://dx.doi.org/10.1117/12.456541.

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3

Gellersen, Frauke K. H., and Arne F. Jacob. "A sol-gel approach for self-biased barium hexaferrite thin-film circulators." In 2016 46th European Microwave Conference (EuMC). IEEE, 2016. http://dx.doi.org/10.1109/eumc.2016.7824353.

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4

Omegna, Federica, Gianfranco Genta, Emanuele M. Barini, Daniele L. Marchisio, and Raffaello Levi. "Sensitivity Testing Revisited: The Case of Sol-Gel Transition." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59091.

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Classical sensitivity testing addresses mainly problems where the level of one stimulus only governs an abrupt transition in output, or response. Both parametric and nonparametric methods developed, and successfully applied over last century to tackle such problems, provide estimates of critical levels beyond which an item will either respond, or not, to a single stimulus, and of related statistics. However classical methods sometimes may not readily provide an answer, namely when more than one stimulus may reach critical level, and either singularly or jointly trigger transition. Factorial and response surface designs, adequate when dealing with continuous responses, may not perform as well for transition threshold estimation. A practical case at hand in chemical engineering concerns the production, through hydrolysis of a specific precursor, of titania sols and gels that find industrial use as additive for paints, concrete and other building materials due to its optical, photo-catalytic and super-hydrophilic properties. Particles formation and aggregation — controlled by varying the primary process parameters, namely initial alkoxide concentration, water to alkoxide and acid to alkoxide ratios, mixing conditions — may yield either stable, transparent nanometric sols, or monolithic gels, where aggregation of nanometric particles produces a final ceramic object. Depending on the application, one of the two products may be desirable, and therefore it is crucial to control the final product properties. Aggregation kinetics and physical properties of sols, and sol to gel transition, were found to depend strongly upon several factors, that is water to alkoxide initial concentration ratio, acid to alkoxide initial concentration ratio, and their interaction. The approach developed in order to estimate parameters pertaining to transition, and related uncertainty, is presented in the paper, and discussed in the light of experimental results.
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5

Uddin, Mohammed Jasim, Tarik J. Dickens, Jin Yan, David O. Olawale, Okenwa I. Okoli, and Federico Cesano. "Solid-State Dye Sensitized Optoelectronic Carbon Nanotube-Wires: An Energy Harvesting Damage Sensor With Nanotechnology Approach." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8200.

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A novel preparation method of solid state photovoltaic carbon nanotubes (CNT) yarns has been successfully developed by depositing and grafting TiO2 thin films on CNT yarn substrates using a simple sol–gel method and designed for use in structural health monitoring (SHM) applications. The interaligned, ultrastrong and flexible CNYs display excellent electrical conductivity, mechanical integrity and their catalytic properties have been successfully used as working and counter electrodes. The TiO2 nanoparticles have been found to form a homogeneous thin film on the yarn surface, which shows efficient photovoltaic properties with remarkable stability when exposed to simulated solar light (AM 1.5). The yarns’ structure is not altered upon sol-gel treatment and light exposure. The TiO2 film is firmly anchored and the photovoltaic performance is retained even after multiple irradiation cycles. This preparation technique can also be applied to CNT yarn reinforced composite for an innovative in-situ and real-time self damage-sensing properties with infused triboluminescent (TL) materials.
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6

Chokkalingam, Venkatachalam, Boris Weidenhof, Wilhelm F. Maier, Stephan Herminghaus, and Ralf Seemann. "Platinum Supported Mesoporous Silica Spheres by Optimized Microfluidic Sol-Gel Synthesis Scheme." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30783.

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Droplet based microfluidics is used to perform sol-gel reactions. The chemicals are dispensed, mixed, and pre-processed inside a microfluidic device allowing for long operation times without any clogging. Using this approach and optimizing all reaction and processing parameters we generate mesoporous silica particles with a very high surface area of 820 m2g−1 and a narrow pore radius distribution of around 2.4 nm. To take full advantage of the possibilities offered by this microfluidic synthesis route, we produced platinum supported silica microspheres (as high as 7 mol. %) for heterogeneous catalysis.
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7

Chokkalingam, Venkatachalam, Boris Weidenhof, Wilhelm F. Maier, Stephan Herminghaus, and Ralf Seemann. "Controlled Production of Monodispersed Silica Microspheres Using a Double Step-Emulsification Device." In ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62109.

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We explore droplet based microfluidics to perform chemical reactions within microfluidic channels. By dispensing the different chemicals in droplets and subsequently merging the droplets containing different chemicals, the reactive mixture never gets in contact with the walls of the surrounding microfluidic channel. Using this approach we can realize chemical reactions for gels or precipitates, which are neither possible in single phase microfluidics, nor in droplet based microfluidics if the chemicals are mixed prior to dispersing the droplets. We explore this explicitly for the production of porous silica particles from sol-gel chemistry. All processing steps ranging from droplet production, synchronization of the droplets containing the different chemicals, combining the droplets, mixing and post processing are discussed and optimized for the particular demands.
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8

Wu, Chia-Che, Cheng-Chun Lee, G. Z. Cao, and I. Y. Shen. "Direct Measurements of Transverse Piezoelectric Coefficient e31 of PZT Thin Films." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59421.

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The purpose of this paper is to develop a direct method to measure e31 of PZT thin films regardless of the boundary conditions of the specimens. The experimental setup consists of a silicon beam with a PZT film excited by a tiny shaker. A charge amplifier detects the charge accumulated in the PZT film. A spectrum analyzer processes the charge amplifier’s output to obtain a frequency spectrum. In addition, three calibration points are defined along the PZT film as 1, 2, and 3. These points are evenly spaced with distance Δx. A laser Doppler vibrometer (LDV) measures the deflection w1, w2, and w3 of the calibration points 1, 2, and 3. According to Euler-Bernoulli beam theory, the normal strain is ε ≈ 0.5h(w1 – 2w2 + w3)/(Δx)2, where h is the thickness of the cantilever. Finally, the ratio of the charge to the strain ε gives e31. Note that this approach does not depend on the boundary conditions of the specimen. Therefore, the boundary conditions do not affect the accuracy of the measurements. To demonstrate the direct measurement method, we fabricate a silicon cantilever beam with a PZT film using sol-gel processes. The dimensions of the silicon canteliver and the PZT thin film are 30 mm × 7.5 mm × 0.4 mm and 4 mm × 4 mm × 1 μm, respectively. Using the resonance amplitude of the first bending mode at 520 Hz, we obtain e31 to be 0.24 C/m2.
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9

Jibhakate, Piyush D., and George J. Nelson. "Fabrication and Characterization of Nanostructured Cathodes for Li-Ion Batteries." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67873.

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Li-ion batteries have emerged as a leading energy storage technology for several applications including portable electronics devices and electric vehicles. Rigorous efforts are made to develop these batteries with higher energy density, higher power density, and better cycling stability while reducing cost and environmental impact. To better understand how electrode microstructure contributes to the electrode performance, the spinel LiMn2O4 (LMO) cathode material was prepared using a template-assisted sol-gel synthesis method. This method involves soaking of polycarbonate template membranes in the precursor solution followed by drying, to remove the solvent. The dried templates containing precursor materials were etched in an oxygen plasma to remove the template, and the nanostructured electrode formed was then calcined to convert these nanostructures to spinel LiMn2O4. Simultaneously, powdered LMO was prepared using the same synthesis procedure, but without the aid of a template to control electrode morphology. A series of tests were performed to study the effect of processing conditions on the structure and morphology of the nanostructured electrodes. The resulting electrodes were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM) in support of efforts to understand the effects of process parameters on the electrochemical performance of the electrode. The template assisted synthesis approach yielded an electrode of well-defined nanotubules. Extending the template soaking time was found to provide better definition of individual tubule structures. Increasing calcination temperature was found to create a better defined spinel structure for the LMO. These observations provide insight into process parameters relevant to electrode preparation and substrate selection when producing nanostructured electrodes using template-assisted methods.
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10

Shi, Yong, Shiyou Xu, and Sang-Gook Kim. "Partially Aligned Piezoelectric Nanofibers by Sol-Gel Electrospining Process." In ASME 4th Integrated Nanosystems Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nano2005-87082.

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This paper reports the fabrication of partially aligned Lead Zirconate Titanate (PZT) nanofibers with an average diameter of 150 nm by Sol-Gel Electrospinning process. Both randomly distributed and uniaxially aligned PZT fibers were obtained from the sol-gel PZT solution with viscosity modified by polyvinyl pyrrolidone (PVP). The diameters of the nano fibers can be further reduced or controlled for different applications. SEM, TEM and x-ray diffraction (XRD) are used to characterize the nano-fibers and their crystal structures. XRD confirmed that pure perovskite phase was formed after the as-spun fibers being annealed at about 650°C. Different approaches have been explored to fabricate the uniaxially-aligned PZT nano-fibers. Microelectromechanical (MEMS) based micro-fabrication technologies are used to assist the development of the nano-fibers in designing the test samples, depositing and patterning the electrodes, and also testing the performance of the nano fibers.
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