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Добірка наукової літератури з теми "Monolithe de silice"

Автор: Grafiati

Опубліковано: 23 червня 2022

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Статті в журналах з теми "Monolithe de silice"

Prabhakaran, D., C. Subashini, and M. Akhila Maheswari. "Synthesis of Mesoporous Silica Monoliths — A Novel Approach Towards Fabrication of Solid-State Optical Sensors for Environmental Applications." International Journal of Nanoscience 15, no. 05n06 (October 2016): 1660014. http://dx.doi.org/10.1142/s0219581x16600140.

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Mesoporous silica monoliths are an attractive area of research owing to their high specific surface area, uniform channels and mesoporous size (2–30[Formula: see text]nm). This paper deals with the direct templating synthesis of a mesoporous worm-like silica monolithic material using F127 — a triblock copolymer, by micro-emulsion technique using trimethyl benzene (TMB), as the solvent. The synthesized silica monolith is characterized using SEM-EDAX, XRD, BET, NMR and FT-IR. The monolith shows an ordered worm-like mesoporous structure with tuneable through pores, an excellent host for the anchoring of chromo-ionophores for the naked-eye metal ion-sensing. The mesoporous monoliths were loaded with 4-dodecyl-6-(2-pyridylazo)-phenol (DPAP) ligand through direct immobilization, thereby acting as solid-state naked-eye colorimetric ion-sensors for the sensing toxic Pb[Formula: see text] ions at parts-per-billion (ppb) level in various industrial and environmental systems. The influence of various experimental parameters such as solution pH, limiting ligand loading concentration, amount of monolith material, matrix tolerance level, limit of detection and quantification has been studied and optimized.

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He, Ping, Stephen J. Haswell, Paul D. I. Fletcher, Stephen M. Kelly, and Andrew Mansfield. "Scaling up of continuous-flow, microwave-assisted, organic reactions by varying the size of Pd-functionalized catalytic monoliths." Beilstein Journal of Organic Chemistry 7 (August 23, 2011): 1150–57. http://dx.doi.org/10.3762/bjoc.7.133.

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A product-scalable, catalytically mediated flow system has been developed to perform Suzuki–Miyaura reactions under a microwave heating regime, in which the volumetric throughput of a Pd-supported silica monolith can be used to increase the quantity of the product without changing the optimal operating conditions. Two silica monoliths (both 3 cm long), with comparable pore diameters and surface areas, were fabricated with diameters of 3.2 and 6.4 mm to give volumetric capacities of 0.205 and 0.790 mL, respectively. The two monoliths were functionalized with a loading of 4.5 wt % Pd and then sealed in heat-shrinkable Teflon® tubing to form a monolithic flow reactor. The Pd-supported silica monolith flow reactor was then placed into the microwave cavity and connected to an HPLC pump and a backpressure regulator to minimize the formation of gas bubbles. The flow rate and microwave power were varied to optimize the reactant contact time and temperature, respectively. Under optimal reaction conditions the quantity of product could be increased from 31 mg per hour to 340 mg per hour simply by changing the volumetric capacity of the monolith.

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Alzahrani, Eman. "Green Silver Nanoparticles Confined in Monolithic Silica Disk-packed Spin Column for Human Serum Albumin Preconcentration." Current Analytical Chemistry 15, no. 6 (October 3, 2019): 616–27. http://dx.doi.org/10.2174/2210676609666181204151244.

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Background: In recent times many new uses have been found for nanomaterials that have undergone homogenous immobilization within porous supports. For this paper, immobilization of SNPs on a thiol-functionalized silica monolith using a fast, easy, environmentally friendly and costeffective process was performed. This was achieved by modifying the surface of a silica-based monolith using thiol groups, and then we fabricated green SNPs in situ, reducing an inorganic precursor silver nitrate solution (AgNO3) by employing tangerine peel extract as a reducing reagent, with Ag-thiol bonds forming along the monument. Doing this allows monoliths to be prepared in such a way that, as TEM analysis demonstrated, SNPs are evenly distributed along the rod's length. Once the materials had been fabricated, they were employed as a sorbent by being placed in a centrifuge. The SNP-thiol functionalized silica monolith was then tested using a standard protein (HSA). Methods: The process involves creating monolithic materials by employing a two-part sol-gel technique before modifying the surface of the silica-based monolith using thiol groups for hosting purposes. Homogenous surface coverage was achieved through the use of a non-toxic "green" reducing reagent (tangerine peel extract) to reduce a silver nitrate solution in place to create SNPs joined to the pore surface of a thiol-functionalized silica monolith, employing bonds of Ag-thiol. Once these materials were synthesized, they were classified by utilizing a number of methods based on SEM coupled with EDAX, TEM, AFM and BET analysis. The silica-based monolith, embedded with constructed SNPs, was employed as a sorbent in the preconcentration of human serum albumin (HSA). Results: The performance of the fabricated materials was measured against a silica-based monolith with no SNPs. Also, a silica monolith with constructed SNPs embedded was employed to capture HSA within a sample of human urine mixed with a double detergent concentrate (SDS). Such a monolith containing functionalized SNPs can be a highly effective sorbent for preconcentration of proteins in complex samples. Conclusion: It was shown to have superior performance compared to a bare silica-based monolith. Additionally, it was shown that a monolithic column modified by SNPs could preconcentrate spiked HSA in urine samples.

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Thejaswini, Thurlapathi VL, and Deivasigamani Prabhakaran. "Synthesis of Mesoporous Titania–Silica Monolith Composites — A Comprehensive Study on their Photocatalytic Degradation of Acid Blue 113 Dye Under UV Light." International Journal of Nanoscience 15, no. 05n06 (October 2016): 1660012. http://dx.doi.org/10.1142/s0219581x16600127.

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The present work deals with the synthesis of bi-continuous macro and mesoporous crack-free titania–silica monoliths, with well-defined structural dimensions and high surface area. The work also highlights their potential photocatalytic environmental applications. The highly ordered titania–silica monoliths are synthesized through direct surface template method using organic precursors of silica and titania in the presence of surface directing agents such as pluronic P123 and PEG, under acetic acid medium. The monoliths are synthesized with different Ti/Si ratios to obtain monolithic designs that exhibit better photocatalytic activity for dye degradation. The titania–silica monoliths are characterized using XRD, SEM, EDAX, FT-IR, TG–DTA and BET analysis. The photocatalytic activity of the synthesized monoliths is tested on the photodegradation of a textile dye (acid blue 113). It is observed that the monolith with 7:3 ratio of Ti/Si showed significant photocatalysis behavior in the presence of UV light. The influence of various physico-chemical properties such as, solution pH, photocatalyst dosage, light intensity, dye concentration, effect of oxidants, etc. are analyzed and optimized using a customized photoreactor set-up. Under optimized conditions, the monoliths exhibited superior degradation kinetics, with the dye dissipation complete within 10[Formula: see text]min of photolysis. The mesoporous catalysts are recoverable and reusable up to four cycles of repeated usage.

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Chen, Ai Bing, Wen Wei Zang, Chao Liu, Yan Yan Wang, Man Ling Jia, Bo Li, and Yi Feng Yu. "Preparation of Monolithic Transparent Mesoporous Silica and Mesoporous Onion-Like Carbon." Advanced Materials Research 557-559 (July 2012): 1518–21. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1518.

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Large-sized, crack-free silica monoliths have been fabricated by a fast and convenient way via EISA method using P123 as soft template and 1-hexadecyl-3-methylimidazolium bromide (［C16mim］Br) as additive. The hydrogen bonds formed between ILs and the silano groups of silica gel play crucial roles in the form of the bulk, transparent silica monolith. The mesoporous structure onion-like carbon monoliths were prepared with the transparent silica monolith as template via the nanocasting technique. The mesoporous silica and carbon monoliths have been characterized by the XRD, HRTEM, N2sorption and elemental analysis. The results reveal that pore diameter of the mesoporous carbon about 3.47nm, and the specific surface area of carbon with a nitrogen content of 4.2%, can be tuned from 408.2-629.0m2/g. HRTEM shows that this carbon material with nanoonions structure.

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Aydoğan, Cemil, İbrahim Y. Erdoğan, and Ziad El-Rassi. "Hydrophobic AEROSIL®R972 Fumed Silica Nanoparticles Incorporated Monolithic Nano-Columns for Small Molecule and Protein Separation by Nano-Liquid Chromatography." Molecules 27, no. 7 (April 1, 2022): 2306. http://dx.doi.org/10.3390/molecules27072306.

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A new feature of hydrophobic fumed silica nanoparticles (HFSNPs) when they apply to the preparation of monolithic nano-columns using narrow monolithic fused silica capillary columns (e.g., 50-µm inner diameter) was presented. The monolithic nano-columns were synthesized by an in-situ polymerization using butyl methacrylate (BMA) and ethylene dimethacrylate (EDMA) at various concentrations of AEROSIL®R972, called HFSNPs. Dimethyl formamide (DMF) and water were used as the porogenic solvents. These columns (referred to as HFSNP monoliths) were successfully characterized by using scanning electron microscopy (SEM) and reversed-phase nano-LC using alkylbenzenes and polyaromatic hydrocarbons as solute probes. The reproducibility values based on run-to-run, column-to-column and batch-to-batch were found as 2.3%, 2.48% and 2.99% (n = 3), respectively. The optimized column also indicated promising hydrophobic interactions under reversed-phase conditions, while the feasibility of the column allowed high efficiency and high throughput nano-LC separations. The potential of the final HFSNP monolith in relation to intact protein separation was successfully demonstrated using six intact proteins, including ribonuclease A, cytochrome C, carbonic anhydrase isozyme II, lysozyme, myoglobin, and α-chymotrypsinogen A in nano-LC. The results showed that HFSNP-based monolithic nanocolumns are promising materials and are powerful tools for sensitive separations.

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Chen, Ai Bing, Yun Hong Yu, Yi Feng Yu, Hai Jun Lv, Ting Ting Xing, Yue Tong Li, and Wen Wei Zang. "Monolithic Macroporous-Mesoporous Carbon Using Ionic Liquids as Carbon Source." Advanced Materials Research 988 (July 2014): 23–26. http://dx.doi.org/10.4028/www.scientific.net/amr.988.23.

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A facile approach is employed for the preparation of hierarchically porous structures monolithic ordered macroporous-mesoporous silica materials (OMS) using the commercially available and cheap polyurethane (PU) foam as monolithic template, triblock copolymer P123 (EO20PO70EO20) as structure-directing agent and tetraethyl orthosilicate (TEOS) as silica source, then monolithic ordered macro porous-mesoporous carbon materials (OMC) is synthesized by using monolithic ordered macroporous-mesoporous silica materials as hard template and ionic liquids as the carbon source. The silica and carbon monoliths possess uniform pore sizes (3.74-3.84 nm) and ordered mesostructure.

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Lu, Lu, Yu Lei Wei, Jie Lin, and Lei Qian. "Fabrication of Silica Monoliths with Hierarchically Porous Structure from Freeze-Drying." Materials Science Forum 814 (March 2015): 76–80. http://dx.doi.org/10.4028/www.scientific.net/msf.814.76.

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This paper provides a novel route to prepare silica monoliths with hierarchical porous structure via freeze drying. In this method, macroporous silica monoliths were first produced by freeze-drying and calcination. By adjusting the concentration of cetyltrimethylammonium bromide in ethylsilicate, a layer of mesoporous thin film was attached on the macroporous silica monolith. The structural characterization of the hierarchical porous monoliths were studied by field emission scanning electron microscopy, mercury porosimeter and nitrogen adsorption-desorption techniques (BET). It turned out that the pore distribution of the obtained monoliths was ranged from 3.72 nm to 23.21nm and the maximum specific surface area calculated from BET was about 288 m2/g, which indicated the existence of hierarchical structure in the obtained material.

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Carroll, Mary, Ann Anderson, Sri Mangu, Zineb Hajjaj, and Margeaux Capron. "Aesthetic Aerogel Window Design for Sustainable Buildings." Sustainability 14, no. 5 (March 2, 2022): 2887. http://dx.doi.org/10.3390/su14052887.

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Transport of heat through windows accounts for more than 25% of heating and cooling losses in residential buildings. Silica-based aerogels are translucent with extremely low thermal conductivity, which make them attractive for incorporation into the interspaces of glazing units. Widespread incorporation of monolithic-silica-aerogel-based windows could result in significant energy savings associated with the heating and cooling of buildings. However, monolithic silica aerogels do not have the optical clarity of vision glass, due to light scattering by the solid matrix, and often have surface imperfections, both of which render these materials less appealing for glazing applications. Here, we demonstrate a variety of approaches to preparing aesthetically pleasing monolithic silica aerogel by a rapid supercritical extraction method for incorporation into glazing units, including: (1) process improvements that result in monoliths with higher visible light transmission; (2) innovative mold design for the preparation of uniform aerogel monoliths; (3) glazing designs that use thinner monoliths; and (4) the incorporation of artistic effects using dyes and laser etching to prepare glazing units with mosaic- or stained-glass-like patterns in which surface imperfections are perceived as features of the design rather than flaws.

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Li, Hongwei, Junhui Pan, Chengtao Gao, Mengyu Ma, Liangyu Lu, Yuzhu Xiong, and Fuping Dong. "Mercapto-Functionalized Porous Organosilica Monoliths Loaded with Gold Nanoparticles for Catalytic Application." Molecules 24, no. 23 (November 29, 2019): 4366. http://dx.doi.org/10.3390/molecules24234366.

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Анотація:

Porous organosilica monoliths have attracted much attention from both the academic and industrial fields due to their porous structure; excellent mechanical property and easily functionalized surface. A new mercapto-functionalized silicone monolith from a precursor mixture containing methyltrimethoxysilane; 3-mercaptopropyltrimethoxysilane; and 3-mercaptopropyl(dimethoxy)methylsilane prepared via a two-step acid/base hydrolysis–polycondensation process was reported. Silane precursor ratios and surfactant type were varied to control the networks of porous monolithic gels. Gold nanoparticles were loaded onto the surface of the porous organosilica monolith (POM). Versatile characterization techniques were utilized to investigate the properties of the synthesized materials with and without gold nanoparticles. Scanning electron microscopy was used to investigate the morphology of the as-synthesized porous monolith materials. Fourier transform infrared spectroscopy was applied to confirm the surface chemistry. 29Si nuclear magnetic resonance was used to investigate the hydrolysis and polycondensation of organosilane precursors. Transmission electron microscopy was carried out to prove the existence of well-dispersed gold nanoparticles on the porous materials. Ultraviolet–visible spectroscopy was utilized to evaluate the high catalytic performance of the as-synthesized Au/POM particles

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Більше джерел

Дисертації з теми "Monolithe de silice"

El-Debs, Racha. "Synthèse de colonnes capillaires de monolithes de silice et développement d’un procédé photochimique simple, localisable et polyvalent de fonctionnalisation de leur chimie de surface." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10254.

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Анотація:

Ce manuscrit est consacré à l’élaboration et à la photofonctionnalisation des monolithes de silice pour les techniques séparatives miniaturisées. La partie bibliographique situe d’abord l’intérêt des monolithes dans les techniques séparatives miniaturisées. L’état d’art sur l’utilisation des monolithes de silice dans ces techniques séparatives est ensuite établi en portant une attention particulière sur leur utilisation dans l’analyse d’échantillons biologiques et/ou environnementaux (préparation d’échantillons couplée aux méthodes séparatives ou utilisation de colonne de grande longueur). Un descriptif de la synthèse des monolithes de silice par le procédé sol gel est ensuite détaillé. Enfin, une étude des différentes méthodes de fonctionnalisation des monolithes de silice est présentée. L’optimisation des paramètres expérimentaux de la synthèse sol-gel a conduit à un procédé de synthèse robuste et répétable de capillaires monolithiques de silice de grandes longueurs et d’efficacités élevées (efficacités de l’ordre de 160 000-200 000 plateaux/m). Le travail expérimental s’est ensuite orienté sur l’optimisation de procédés de fonctionnalisation par voie thermique et sur le développement de nouveaux procédés de photopolymérisation ou de photografting par « photo click chemistry ». Les résultats obtenus dans des modes chromatographiques variés après photofonctionnalisation avec différents monomères montrent que ces procédés sont polyvalents et qu’un contrôle des paramètres permet de conserver les performances chromatographiques du matériau de départ. Outre sa simplicité et sa rapidité, cette approche permet de définir et de localiser différentes chimies de surface au sein d’une même colonne. Cette spécificité a été mise à profit pour le couplage en ligne dans une colonne de nanochromatographie, d’une étape de préconcentration avec une étape de séparation de neuropeptides modèles
This manuscript is dedicated to the development and functionalization of monolithic silica stationary phases for miniaturized separation techniques. The bibliographic section first summarizes the interest of monolithic phases for the development of miniaturized separation techniques and their advantages over their particulate counterparts (small particles or core shell ones). The state of the art on the use of silica monolithic columns in separation techniques is then established, with a focus on their use in the analysis of biological and/or environmental samples (coupling sample preparation with an analysis method or using long columns). Then a detailed description of the sol gel synthesis of monolithic silica is presented. Finally, a study of different established methods of functionalization of silica monoliths is presented and the potential of photofunctionalization is highlighted for the rapid and homogeneous in-situ functionalization of monolithic capillaries. The experimental part focuses first on the development and optimization of a robust process of synthesis of monolithic silica capillary columns (efficiencies around 160 000-200 000 plates/m). The work is then focused on the improvement of classical functionnalization processes and on the development of new photofunctionalization ways (photopolymerization and photo click chemistry) of silica monolithic columns. The results obtained after photofonctionnalisation in various chromatographic modes (from ion exchange to reversed phase and HILIC) mode with different monomers show that these methods are versatile and that the control of the parameters allows keeping the chromatographic performances of the starting material. Besides its simplicity and speed, this approach allows to define and to locate different surface chemistries in the same column. This specificity has been exploited to the in-line coupling a preconcentration step with a separation step in a single column, for the separation of model neuropeptides

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Roux, Richard. "Synthèse de phase stationnaires monolithiques de silice hybrides pour les techniques séparatives miniaturisées." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10208.

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Анотація:

Ce manuscrit est consacré à la synthèse par procédé sol-gel et à la caractérisation de matériaux monolithiques de silice hybrides pour les techniques séparatives miniaturisées : nano-chromatographie en phase liquide (nano-CPL), électrochromatographie capillaire (ECC) et microsystèmes séparatifs. La partie bibliographique situe les axes de développement récents des techniques séparatives : l’augmentation de l’efficacité par unité de temps, l’augmentation de la capacité de pics et la miniaturisation de ces techniques. Après un descriptif détaillé de l’évolution des techniques séparatives lors de ces dernières années, une attention particulière est portée sur les phases stationnaires monolithiques à base de silice. Enfin, une étude approfondie des différentes fonctionnalisations de ces monolithes de silice met en évidence l’intérêt porté aux monolithes de silice hybrides en termes de simplification du protocole de synthèse. La partie expérimentale est ainsi axée sur le développement et la caractérisation de ces monolithes de silice hybrides dédiés à la chromatographie à polarités de phases inversée. Dans un premier temps, la synthèse de monolithes de silice hybrides C3 illustre la possibilité de synthétiser par voie sol-gel (100% aqueux) un monolithe de silice fonctionnalisé et performant en une seule étape (« one pot »). Dans un second temps, ce type de procédé est employé et optimisé afin de synthétiser des capillaires monolithiques de silice hybrides C8 présentant des performances équivalentes à leurs homologues C8 préparés en deux étapes (synthèse puis greffage) et comparables à des colonnes particulaires (d particules 5 μm)
This manuscript is dedicated to the synthesis (via sol-gel process) and caracterization of hybrid monolithic silica for miniaturized separation techniques : nano-liquid chromatography (nano-LC), capillary electrochromatography (CEC) and microchips. The bibliography part deals with the recent axis of development of these separatives techniques : increase of efficiency per time unit, increase of peak capacity and miniaturisation of these techniques. After an overview of this evolution, the manuscript is focused on the silica monolithic stationnary phases. Finally, a detailed study on the different kinds of protocol fonctionnalization of these silica monoliths highlights the advantage of simplifying the synthesis using a single step protocol (« one pot »). The experimental part is also focused on this kind of single step protocol so as to synthesize hybrid silica monoliths dedicated to the reversed phase mode in chromatography. First, the synthesis of hybrid C3 silica monoliths shows the ability to synthesize a functionnalized silica monolith via a single step sol gel process (« one pot »). Then, this kind of process is used and optimized in order to synthesize a hybrid C8 silica monolithic into capillaries. These stationary phases allowed reaching performances similar to those synthesized in two steps (sol-gel process and grafting) and to the particulate columns (5 μm)

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Feng, Airong. "Monolithe polymérique ou à base de silice pour la préconcentration couplée à l'électrophorèse capillaire pour l'analyse de biomolécules." Paris 11, 2010. http://www.theses.fr/2010PA114823.

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Анотація:

L’électrophorèse capillaire (EC) est une technique analytique séparative moderne qui offre les avantages d’une haute résolution, de temps d’analyse courts et d’une consommation minimale des échantillons et réactifs. Toutefois, il est difficile d'analyser ces échantillons directement par EC sans prétraitement. Par conséquent, la purification des échantillons et l'amélioration de la sensibilité de détection sont primordiales afin de permettre l’utilisation de l’EC pour analyser ces composés. Ainsi, le but de ce travail était de développer et de synthétiser in-situ des monolithes dans des capillaires pour la pré-concentration de protéines et d’ADN en EC. Le couplage en ligne de l'extraction et la séparation d'ADN par EC a été développé en préparant un monolithe aminé à base de silice. Par ailleurs, la polymérisation d'un monolithe fonctionnalisé par des anticorps immobilisés a été mise au point pour une pré-concentration de protéines par immuno-affinité couplée à leur séparation par EC
Capillary electrophoresis (CE) is increasingly important for biomolecular analysis with the advantages of high resolution, short separation time, minimal sample and reagent requirement. However, because of the complexity of real biological sample in which matrices (e. G. , salts, lipids) interfere with the injection and assay, it remains difficult to analyze biological sample directly by CE without pretreatment. Moreover, in the case of low concentration levels of analytes in real samples, CE is limited by its detection sensitivity. The in situ prepared monolithic materials, which have the advantages of easy preparation, excellent permeability, were proposed for the preconcentration purpose in CE. In this thesis, an amino silica monolith was developed for efficient DNA extraction and in-line coupling with CE for DNA separation. In addition, the polymerization and application of an affinity polymer monolithic capillary for immunopreconcentration-CE of protein were included in this work

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Marechal, Audrey. "Colonnes monolithiques multimodales photofonctionnalisées dédiées aux techniques séparatives miniaturisées." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10308/document.

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Анотація:

Une des évolutions dans le domaine de l'analyse chimique concerne la miniaturisation des systèmes d'analyse. Cette tendance s'accompagne du développement de nouvelles approches expérimentales basées, par exemple, sur l'intégration de plusieurs étapes analytiques, couplées en ligne en système miniaturisé. Cette intégration, en ligne, d'étapes mettant en jeu des mécanismes de séparation différents et généralement orthogonaux, implique cependant d'Ãªtre capable de définir des zones (segments de colonne vides et/ou remplis de phase stationnaire) présentant des chimies de surface adaptées. L'approche choisie pour la préparation de ces colonnes " multimodales ", repose sur (1) la synthèse d'un monolithe de silice poreux "générique " dans des tubes capillaires de quelques dizaines de microns de diamètre interne et (2) la modification de surface localisée dans le capillaire permettant d'apporter des propriétés de surface complémentaires. Dans le cadre de cette thèse, deux procédés de fonctionnalisation innovants, initiés par photochimie, ont été développés pour la préparation des colonnes multimodales miniaturisées : la photopolymérisation, basée sur des réactions de polymérisation radicalaire, et la " photoclick chemistry ", basée sur un greffage radicalaire contrôlé (et non plus une polymérisation). Un état de l'art de leur utilisation en sciences séparatives a été dressé pour chacun des procédés, afin de guider le choix des stratégies de greffage. Après une optimisation des conditions de greffage, les résultats présentés dans ce manuscrit montrent que ces procédés de fonctionnalisation sont rapides (fonctionnalisation en quelques minutes), efficaces, polyvalents (transposables Ã de multiples greffons) et localisables. Leurs potentiels respectifs dans la préparation des colonnes multimodales ont ensuite été démontrés pour la préconcentration/séparation en ligne de plusieurs composés. L'approche par " click chemistry " qui permet un meilleur contrôle du greffage, a été étendue au greffage de biomolécules pour la préparation de supports d'immunoaffinité. Ainsi, une colonne multimodale composée d'une première zone remplie de monolithe photogreffée avec des aptamères et une deuxième zone vide a été préparée pour la préconcentration/séparation électrocinétique en ligne de l'Ochratoxine A
Miniaturization of analytical processes is a general trend in analytical chemistry. Such trend is driven by the development of new experimental approaches based, for example, on hyphenated analytical steps or techniques. The in-line coupling of different and generally orthogonal/complementary separation mechanisms at the microscale, is dependent on the capability to define functional segments (open column segments and/or filled with stationary phase). Preparation of such "multimodal" capillary columns is based on (1) the in-capillary synthesis of a "generic" porous silica monolith and (2) on its localized chemical surface modification to define specific functional segments. Herein, two innovative photo-functionalization processes have been investigated for the preparation of multimodal miniaturized columns. The former, called photopolymerization is based on acrylate free radical polymerization reactions while the latter, called photografting, implements the thiol-ene "photoclick chemistry" reaction. These photo-initiated processes, after optimization, prove to be rapid (within few minutes), versatile (adapted to the grafting of various monomers) and localizable. Photopolymerization of acrylate monomers on activated silica monolith (using ?-methacryloxypropyltrimethoxysilane) gives rise to highly retentive columns due to the polymeric nature of the layer obtained. Photografting of octadecanethiol on vinylized silica columns leads to monolayer-like coating. The preparation of dedicated multimodal columns using such approaches was then successfully applied to the in-line preconcentration / separation of neuropeptides and preconcentration / fractionation of various neutral and charged compounds. The "click chemistry" approach which allows a better control of the reaction, has been extended to the grafting of biomolecules for the preparation of immunoaffinity supports. Thus, a multimodal column composed a 1-cm length aptamer-functionalized monolith at the entrance of a CZE open capillary has been prepared and successfully applied to the in-line preconcentration/electrokinetic separation of Ochratoxin A in white wine and beer

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Abi, Jaoudé Maguy. "Développement de phases monolithiques à base de dioxyde de titane pour la séparation et l’enrichissement des produits phosphorylés." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10310.

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Ce manuscrit est consacré à l’élaboration de phases monolithiques à base de dioxyde de titane pour les techniques séparatives appliquées à l’analyse des produits phosphorylés. La partie bibliographique situe d’abord l’intérêt des monolithes pour le développement des techniques séparatives en portant une attention particulière à la problématique de miniaturisation. L’état de l’art sur l’utilisation du dioxyde de titane, dans les sciences séparatives, est ensuite établi. À ce niveau, les principales caractéristiques physico-chimiques et chromatographiques de ce matériau sont revues pour les lits particulaires. Un descriptif de la synthèse des monolithes de dioxyde de titane par le procédé sol-gel est ensuite détaillé avant d’illustrer la mise en oeuvre de ce type de colonnes dans les techniques séparatives. La partie expérimentale est axée d’abord sur la compréhension du comportement du dioxyde de titane particulaire en chromatographie liquide à interaction hydrophile (HILIC). Le travail expérimental est ensuite orienté vers l’élaboration d’un procédé sol-gel répétable, permettant d’obtenir le matériau sous le format monolithique. Dans un premier temps, le support est élaboré sous forme de barreau, dont l’utilisation potentielle après mise en colonne est illustrée dans le cadre de la purification et de l’enrichissement des acides aminés phosphorylés. Des adaptations de protocole sont apportées pour la synthèse in situ de ces monolithes à l’intérieur des capillaires afin de répondre aux contraintes des techniques séparatives miniaturisées. Ces monolithes sont caractérisés en HILIC, par comparaison avec les phases particulaires. Pour terminer, les propriétés chromatographiques originales de ces phases sont mises à profit pour la séparation et le traitement d’échantillons, contenant des produits phosphorylés
This manuscript is dedicated to the development of monolithic titania phases for chromatographic analysis of phosphorylated compounds. The bibliography section first summarizes the interest of monolithic phases for the development of separation techniques while emphasizing on the problem of miniaturization. The state of the art on the use of titanium dioxide in liquid chromatography techniques is established. In this subject, the physico-chemical and chromatographic behaviour of this material are reviewed for particle beds. Then a detailed description of the sol-gel synthesis of monolithic titania is presented with a final illustration of the potential use of this support in separation techniques. The experimental part concentrates first on the analysis of the chromatographic behaviour of particulate titania in the hydrophilic interaction mode (HILIC). The work is then focused on the development of a repeatable sol-gel process that enables the formation of monolithic titania. The monolithic phase is first synthesized at a large scale, and its potential use, after column cladding, is illustrated with the purification and enrichment of phosphorylated amino acids. The elaboration process is also adapted to meet with the miniaturized separation techniques by performing an in situ synthesis route within capillary columns. These columns are characterized in HILIC by comparison with the chromatographic properties observed for titania particulate beds. The original behaviour of native titania observed also for the synthesized monolithic phases is finally applied to the separation and sample treatment of mixtures of phosphorylated products

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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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Venet, Saphir. "Stockage du CO2 et séparation CO2/CH4 par des matériaux de silice à porosité et fonctionnalité contrôlées : étude expérimentale et modélisation de dynamique moléculaire." Thesis, Pau, 2018. http://www.theses.fr/2018PAUU3027/document.

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Ce travail vise à évaluer les performances de matériaux à base de silice et à rationaliser leur synthèse en fonction des propriétés d’adsorption recherchées (capacité et/ou sélectivité) en combinant des approches expérimentales et la modélisation de dynamique moléculaire. Ces matériaux devaient idéalement présenter une capacité d’adsorption CO2 mais également une sélectivité CO2 /CH4 élevées. Les différentes étapes de ce travail ont été :- la synthèse et la fonctionnalisation des matériaux de silice,- leur caractérisation texturale et chimique,- la détermination des capacités d’adsorption du CO2, de leur sélectivité CO2/CH 4 ,- les caractérisations par différentes techniques spectroscopiques et microscopiques des échantillons pour essayer de localiser l’adsorption du CO2 et mesurer sa mobilité,- l’identification microscopique par modélisation moléculaire des facteurs physico-chimiques influant sur l’adsorption préférentielle du CO2 et sa diffusivité dans le matériau hôte ainsi que sur le rôle du caractère hydrophile/hydrophobe du matériau de silice par le biais de sa fonctionnalisation.Ces objectifs ont nécessité la préparation de matériaux à surfaces spécifiques élevées par le biais d’un procédé sol-gel simple. Ces matériaux ont été modifiés afin d’obtenir un taux de fonctionnalisation par des groupements -CH3 suffisant pour modifier le caractère hydrophile du matériaux tout en conservant une surface spécifique suffisante. L’influence de la taille des pores a également été sondée.Les capacités d’adsorption des gaz sous pression ont été réalisées pour les gaz purs mais également sur des mélanges CO2/CH4 dans différentes proportions. La sélectivité CH 4 /CO 2 , souvent estimée à partir des isothermes des corps purs et/ou la méthode IAST, a dans ce cas été déterminée à partir de la mesure directe des isothermes des mélanges de gaz. Il est apparu que l’eau joue un rôle crucial sur les capacité et sélectivités d’adsorption. Ce paramètre est l’un de ceux qui a été étudié à travers les simulations de dynamiques moléculaires. L’influence de l’introduction de groupements hydrophobes a également été exploré.Les résultats obtenus par dynamique moléculaire sont dans l’ensemble en bon accord avec les données expérimentales. Ces deux approches parallèles expérience/théorie ont mis en évidence la sélectivité de l’un des matériaux pour des applications où l’effluent gazeux est peu chargé en CO 2
This work aims to evaluate the performance of silica-based materials and to rationalize their synthesis according to their desired adsorption properties (capacity and/or selectivity) by combining experimental approaches and the management of the molecular animal. These materials are ideally suited for CO2 adsorption capacity but also CO2/ CH4 selectivity. The different stages of this work were:- the synthesis and functionalization of the silica materials,- their textural and chemical characterization,- the determination of CO2 adsorption capacities, of their CO2/ CH4 selectivity.- the characterizations by various spectroscopic and microscopic techniques of tests to try to locate the adsorption of CO2 and to measure its mobility,- microscopic identification by the factor of physic-Factors influence the preferential adsorption of CO2 and its diffusivity in the role of hydrophilic / hydrophobic character in silica by functional.These objectives required the preparation of high specific surface materials through a simple sol-gel process. These materials have been modified in order to obtain a degree of functionalization with -CH3 groups sufficient to modify the hydrophilic nature of the material while maintaining a sufficient specific surface area. The influence of pore size was also probed.The adsorption capacities of the gases under pressure were carried out for pure gases but also on CO2/ CH4 mixtures in different proportions. The CH4/ CO2 selectivity, often estimated from the pure body isotherms and / or the IAST method, was in this case determined from the direct measurement of the isotherms of the gas mixtures. It has become apparent that water plays a crucial role in adsorption capacity and selectivity. This parameter is one of those studied through molecular dynamics simulations. The influence of the introduction of hydrophobic groups has also been explored.The results obtained by molecular dynamics are on the whole in good agreement with the experimental data. These two parallel experience / theory approaches have highlighted the selectivity of one of the materials for applications where the gaseous effluent is little loaded with CO2

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Smått, Jan-Henrik. "Hierarchically porous silica, carbon, and metal oxide monoliths : synthesis and characterization /." Turku : Åbo akademi University, 2006. http://catalogue.bnf.fr/ark:/12148/cb409697351.

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Iapichella, Julien. "Structuration hiérarchique des particules et des monolithes siliciques pour la chromatographie." Montpellier 2, 2006. http://www.theses.fr/2006MON20180.

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Cette thèse traite de deux types de morphologies de silices poreuses : les particules et les monolithes. Suivant leur morphologie, ces matériaux siliciques possèdent des performances chromatographiques variables. En travaillant sur de tels matériaux pour la chromatographie, il est donc capital de se préoccuper de leurs morphologies. Il est possible de structurer la mésoporosité de ces matériaux siliciques en MTS (Matériaux aux Tensioactifs Structurants) tout en conservant leur morphologie initiale. Par ce procédé, appelé transformation pseudomorphique, nous avons pu obtenir différents matériaux particulaires mésostructurés (MCM-41, MCM-48 et MTS), issus du même précurseur silicique (Lichrospher 60 commercialisée). Tous ces matériaux ont pu être utilisés pour des applications séparatives en chromatographie liquide. Cette étude nous a permis de comprendre l’influence des différents types de mésostructuration sur les performances chromatographiques. La perméabilité des monolithes siliciques permet de séparer des solutés à très haute vitesse sans générer de perte de charge. Le procédé sol-gel de synthèse, de ces matériaux, permet de contrôler indépendamment la méso- et la macroporosité. De plus ce procédé semble être la voie la plus prometteuse pour travailler sur la miniaturisation de systèmes analytiques. La transformation pseudomorphique, sur les monolithes siliciques, a permis d’ordonner la mésoporosité au sein de ces matériaux qui sont déjà poreux à 80%. Le greffage d’alkylsilane a permis de fonctionnaliser divers matériaux siliciques amorphes et structurés obtenus au cours de la thèse (MCM-41 et MTS, particules et monolithes). Les taux de recouvrement, avant et après mésostructuration par pseudomorphisme, nous ont permis de mieux comprendre les propriétés chimiques de la surface de ces matériaux. Après fonctionnalisation, toute forme de silice poreuse présente une grande stabilité mécanique (jusqu’à 3000 Bars). Les phases particulaires, mésostructurées par pseudomorphisme et fonctionnalisées par des alkylsilanes, peuvent être utilisées pour la chromatographie en phase inverse et même sous de haute pression

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Ahmad, Sher. "Traitement des eaux contenant de la tétracycline avec la laccase de Trametes Versicolor immobilisée sur des monolithes de silice macroporeux." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG034.

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Dans ce travail de recherche, des monolithes en silice présentant une très grande porosité (83 %), une double distribution de taille de pores (des macropores de diamètre 20 μm et des méseopores de diamètre 20 nm) et une très grande surface spécifique (370 m2 g-1) ont été utilisés comme supports pour immobiliser une laccase de Trametes versicolor par greffage covalent avec du glutaraldéhyde. Les monolithes enzymatiques ont été utilisés pour dégrader la tétracycline (TC) en solution aqueuse dans un réacteur de configuration tubulaire type "Flow Through Reactor" avec recyclage. Au cours des 5 premières heures de réaction à pH 7 ; 40 à 50 % de la TC a été dégradée, puis un seuil a été atteint. Une des hypothèses pouvant expliquer ce comportement est un éventuel manque de co-substrat (oxygène) à proximité des sites catalytiques. Des monolithes enzymatiques ont été utilisés pendant 75 h de fonctionnement séquentiel sans perte d'activité. L'efficacité de la dégradation de la TC a pu être simulée à travers un modèle mathématique construit en couplant la cinétique de la réaction (Michaelis-Menten) avec un bilan matière en régime dynamique. Les résultats de la simulation ont révélé que le procédé global est contrôlé par la cinétique enzymatique mais que la taille des monolithes pouvait être adaptée pour dégrader 100 % de la CT en un seul passage à travers un monolithe
In this research work, silica monoliths with high porosity (83 %), double pore size distribution (20 μm and 20 nm macro- and mesopores diameters, respectively) and high surface area (370 m2 g-1) have been used as solid supports to immobilize a laccase from Trametes versicolor by covalent grafting with glutaraldehyde. Enzymatic monoliths were applied to degrade tetracycline (TC) in aqueous solutions in a tubular “Flow Through Reactor” configuration with recycling. During the first 5h of reaction at pH 7, 40–50% of TC was degraded, and then a threshold was reached. One of the hypotheses explaining this behaviour is a possible co-substrate lack (oxygen) near catalytic sites. Enzymatic monoliths were used during 75 h of sequential operation without losing activity. A mathematical model built coupling the Michaelis-Menten reaction kinetics with a dynamic mass balance allowed computing TC degradation efficiency. Simulation results revealed that the global process is controlled by the enzymatic kinetics but the monolith size could be adapted to degrade 100 % TC in a single pass

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Книги з теми "Monolithe de silice"

Unger, Klaus K., Nobuo Tanaka, and Egidijus Machtejevas, eds. Monolithic Silicas in Separation Science. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.

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Smått, Jan-Henrik. Hierarchically porous silica, carbon, and metal oxide monoliths: Synthesis and characterization. Turku: Åbo Akademi University, 2005.

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Unger, K. K., Nobuo Tanaka, and Egidijus Machtejevas. Monolithic silicas in separation science: Concepts, syntheses, characterization, modeling and applications. Weinheim: Wiley-VCH Verlag GmbH, 2011.

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Danesh, Mina. Monolithic inductors for silicon radio frequency integrated circuits. Ottawa: National Library of Canada, 1999.

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A, Salem Jonathan. Strength and toughness of monolithic and composite silicon nitrides. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (5th 2004 Atlanta, Ga.). 2004 Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems: Digest of papers. Edited by Cressler John D, Papapolymerou John, IEEE Microwave Theory and Techniques Society., Georgia Institute of Technology. Georgia Electronic Design Center., and NASA Glenn Research Center. Piscataway, N.J: IEEE, 2004.

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E, Ponchak George, and IEEE Microwave Theory and Techniques Society., eds. 2003 Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems: Digest of papers : [9-11 April, 2003, Grainau, Germany]. Piscataway, NJ: IEEE, 2003.

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Topical, Meeting on Silicon Monolithic Integrated Circuits in RF Systems (7th 2007 Long Beach Calif ). 2007 Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems: Digest of papers : [10-12 January 2007, Long Beach, CA, USA]. Piscataway, N.J: IEEE, 2007.

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Topical, Meeting on Silicon Monolithic Integrated Circuits in RF Systems (1st 1998 Ann Arbor Michigan). 1998 Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems: Digest of papers : [17-18 September, 1998, Ann Arbor, Michigan, USA]. Piscataway, New Jersey: IEEE, 1998.

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Ariz.) Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (11th 2011 Glendale. 2011 IEEE 11th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF 2011): Glendale, Arizona, USA, 17-19 January 2011. Edited by Sharifi Hasan editor and Institute of Electrical and Electronics Engineers. Piscataway, NJ: IEEE, 2011.

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Частини книг з теми "Monolithe de silice"

Chaudhuri, S. Ray, and Arnab Sarkar. "Large Silica Monoliths." In Sol-Gel Optics, 83–107. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2750-3_4.

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Kimerling, L. C., L. Dal Negro, S. Saini, Y. Yi, D. Ahn, S. Akiyama, D. Cannon, et al. "Monolithic Silicon Microphotonics." In Topics in Applied Physics, 89–120. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39913-1_3.

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Ashman, Keith. "Silica Monolithic Columns and Mass Spectrometry." In Monolithic Silicas in Separation Science, 273–83. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch14.

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Nakanishi, Kazuki. "Synthesis Concepts and Preparation of Silica Monoliths." In Monolithic Silicas in Separation Science, 9–33. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch2.

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Fauchet, Philippe M. "Monolithic Silicon Light Sources." In Topics in Applied Physics, 177–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39913-1_5.

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Machtejevas, Egidijus, and Eglė Machtejevienė. "Monolithic Silica Columns in Multidimensional LC-MS for Proteomics and Peptidomics." In Monolithic Silicas in Separation Science, 297–317. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch16.

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Tanaka, Nobuo, and Klaus K. Unger. "The Basic Idea and the Drivers." In Monolithic Silicas in Separation Science, 1–7. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch1.

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Taha, Mohammed, Abdelkarem Abed, and Sami El Deeb. "Quality Control of Drugs." In Monolithic Silicas in Separation Science, 189–205. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch10.

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Nesterenko, Pavel N., and Paul R. Haddad. "Monolithic Stationary Phases for Fast Ion Chromatography." In Monolithic Silicas in Separation Science, 207–30. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch11.

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Chankvetadze, Bezhan. "Monolithic Chiral Stationary Phases for Liquid-Phase Enantioseparation Techniques." In Monolithic Silicas in Separation Science, 231–48. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633241.ch12.

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Тези доповідей конференцій з теми "Monolithe de silice"

Bhattacharyya, Arpita, and Catherine Klapperich. "Fabrication of Polymeric Microfluidic Device for On-Chip Isolation of Nucleic Acids." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75200.

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A microfluidic chip-based solid phase extraction method for isolation of nucleic acids is demonstrated. The chip was fabricated in a cyclic polyolefin by hot embossing with a master. The solid phase was made by in-situ UV polymerization of a monolithic column impregnated with silica particles, and separation was achieved due to irreversible binding of the nucleic acids to the silica particles in the monolith. The porous monolithic column was formed within the channels of the device by photoinitiated polymerization of a mixture of methacrylate and dimethacrylate monomers, UV sensitive free radical initiator and porogenic solvent. The channel surface was photografted with a thin interlayer polymer prior to preparation of the monolith in the channel. The grafted layer covalently attached the monolith and prevented the formation of voids between the monolith and the channel surface. The solid-phase prepared by this method allowed for successful extraction and elution of nucleic acids.

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Bhatia, Tania, G. V. Srinivasan, Sonia V. Tulyani, Robert A. Barth, Venkat R. Vedula, and William K. Tredway. "Environmental Barrier Coatings for Monolithic Silicon Nitride: Bond Coat Development." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27685.

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Environmental barrier coatings (EBCs) are being developed for silicon carbide (SiC) based composites and monolithic silicon nitride (Si3N4) to protect against the accelerated oxidation and subsequent silica volatilization in high temperature high-pressure steam environments encountered in gas turbine engines. It has been found that the application of EBCs developed for SiC-based composites (EBCSiC) to monolithic silicon nitride results in a loss of room temperature mechanical strength of the monolithic substrate. In this paper, we discuss the development of a bond coat system tailored for monolithic silicon nitride that helps retain the strength of the substrate. Some of the unique requirements and challenges associated with the processing of non-line-of-sight EBCs for Si3N4 will also be discussed. Preliminary results from coating of airfoils will be presented.

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Bhatia, Tania, Venkat Vedula, Harry Eaton, Ellen Sun, John Holowczak, and Gary Linsey. "Development and Evaluation of Environmental Barrier Coatings for Si-Based Ceramics." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54092.

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Environmental barrier coatings (EBCs) are being developed for silicon carbide (SiC) based composites and monolithic silicon nitride (Si3N4) to protect against the accelerated oxidation and subsequent silica volatilization in high temperature, high-pressure steam environments encountered in gas turbine engines. While EBCs for silicon carbide (EBCSiC) have been demonstrated in combustor liner applications, efforts are ongoing in the development of EBC systems for silicon nitride (EBCSiN). The challenges of adapting EBCSiC to monolithic Si3N4 are discussed in this paper. Progress in the area of EBCSiN including development and performance during field tests and tests simulating engine conditions are reviewed.

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Wang, Ping, Zilin Chen, and Hsueh-Chia Chang. "A New Monolithic Electrokinetic Pump With Bubble-Less Design." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75145.

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An electrokinetic micro-pump fabricated by a sol-gel process has been designed which can be used as a robust fluid-driving unit on a chip-scale analytical system. An overall monolithic silica matrix with morphology of micron-scaled through pores was formed within 100-μm inner diameter fused silica capillary. This pump utilizes electroosmotic flow to propel liquid solution with no moving parts. The Nafion® house design in the cathode chamber separates the electrolytic bubble interference from flow channels. The maximum flow rate and maximum pressure generated by the pump are 3.0 μL/min and 3.5 atm, respectively, at 6 kV. The flow rate can be controlled in the range 200 nL-3.0 μL/min by adjusting applied electric filed. As the monolith is silica-based, this pump can be used for a variety of fluids, especially for organic solvents such as acetonitrile and methanol, without swelling and shrinking problems. These results indicate that the pump can provide sufficient pressure and flow for micro-total-analysis systems (μTAS).

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Tsuchizawa, Tai, Hidetaka Nishi, Rai Kou, Hiroshi Fukuda, Hiroyuki Shinojima, Yasuhiko Ishikawa, Kazumi Wada, and Koji Yamada. "Silicon-silica Monolithic Photonic Integration for Telecommunications Applications." In Integrated Photonics Research, Silicon and Nanophotonics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/iprsn.2012.itu4b.2.

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Yamada, K., T. Tsuchizawa, H. Nishi, R. Kou, H. Shinojima, H. Fukuda, T. Hiraki, Y. Ishikawa, and K. Wada. "Silicon-silica monolithic photonic integration platform for telecommunications applications." In 2012 Opto-Electronics and Communications Conference (OECC). IEEE, 2012. http://dx.doi.org/10.1109/oecc.2012.6276384.

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Yamada, K., T. Tsuchizawa, H. Nishi, R. Kou, T. Hiraki, H. Fukuda, Y. Ishikawa, and K. Wada. "Silicon/Ge/Silica monolithic photonic integration for telecommunications applications." In 2012 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2012. http://dx.doi.org/10.7567/ssdm.2012.a-1-1.

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Tarr, Garry, Winnie Ye, and Shuxia Li. "Monolithic integration of SOI waveguide photodetectors and transimpedance amplifiers." In Silicon Photonics XIII, edited by Graham T. Reed and Andrew P. Knights. SPIE, 2018. http://dx.doi.org/10.1117/12.2290395.

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Chang, Chia-Ming, and Olav Solgaard. "Monolithic silicon waveguides in bulk silicon." In 2012 IEEE Optical Interconnects Conference. IEEE, 2012. http://dx.doi.org/10.1109/oic.2012.6224463.

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Doerr, C. R., P. J. Winzer, S. Chandrasekhar, M. Rasras, M. Earnshaw, J. Weiner, D. M. Gill, and Y. K. Chen. "Monolithic Silicon Coherent Receiver." In National Fiber Optic Engineers Conference. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/nfoec.2009.pdpb2.

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Звіти організацій з теми "Monolithe de silice"

Grimmer, D. P. Monolithic amorphous silicon modules on continuous polymer substrate. Office of Scientific and Technical Information (OSTI), March 1992. http://dx.doi.org/10.2172/5784428.

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Carlson, D., R. Ayra, M. Bennett, J. Brewer, A. Catalano, R. D'Aiello, C. Dickson, et al. Research on high-efficiency, single-junction, monolithic, thin-film amorphous silicon solar cells. Office of Scientific and Technical Information (OSTI), September 1989. http://dx.doi.org/10.2172/5434340.

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Catalano, A., D. Carlson, R. Ayra, M. Bennett, R. D'Aiello, C. Dickson, C. Fortmann, et al. Research on high-efficiency, single-junction, monolithic, thin-film amorphous silicon solar cells. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5496057.

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Ayra, R., M. Bennett, C. Dickson, B. Fieselmann, C. Fortmann, B. Goldstein, J. Morris, et al. Research on high-efficiency, single-junction, monolithic, thin-film amorphous silicon solar cells. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5383673.

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Grimmer, D. P. Monolithic amorphous silicon modules on continuous polymer substrate. Final subcontract report, 9 January 1991--14 April 1991. Office of Scientific and Technical Information (OSTI), March 1992. http://dx.doi.org/10.2172/10131823.

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Jeffrey, F. Photovoltaic manufacturing technology monolithic amorphous silicon modules on continuous polymer substrates: Final technical report, July 5, 1995--December 31, 1999. Office of Scientific and Technical Information (OSTI), March 2000. http://dx.doi.org/10.2172/754636.

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Wiesmann, H., J. Dolan, G. Fricano, and V. Danginis. Research on high-efficiency, single-junction, monolithic, thin-film amorphous silicon solar cells: Annual subcontract report, May 1985 - Jul 1986. Office of Scientific and Technical Information (OSTI), February 1987. http://dx.doi.org/10.2172/6587080.

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Jeffrey, F. Photovoltaic manufacturing technology monolithic amorphous silicon modules on continuous polymer substrates. Annual technical progress report, 5 July 1995--4 June 1996. Office of Scientific and Technical Information (OSTI), February 1997. http://dx.doi.org/10.2172/453486.

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Jeffrey, F. Photovoltaic manufacturing technology monolithic amorphous silicon modules on continuous polymer substrates. Annual technical progress report, July 5, 1996--December 31, 1997. Office of Scientific and Technical Information (OSTI), August 1998. http://dx.doi.org/10.2172/656874.

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Delahoy, A. E., E. Eser, F. Kampas, and R. Lenskold. Research on high-efficiency, single-junction, monolithic, thin-film amorphous silicon solar cells: Final report, October 1, 1983--January 31, 1987. Office of Scientific and Technical Information (OSTI), March 1989. http://dx.doi.org/10.2172/6304136.

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