The Experts below are selected from a list of 2208 Experts worldwide ranked by ideXlab platform
Toru Takehisa - One of the best experts on this subject based on the ideXlab platform.
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nanocomposite hydrogels a unique organic inorganic network structure with extraordinary mechanical optical and swelling de swelling properties
Advanced Materials, 2002Co-Authors: Kazutoshi Haraguchi, Toru TakehisaAbstract:Novel nanocomposite hydrogels (NC gels) with a unique organic-inorganic (clay) network structure (see Figure) have been synthesized by in-situ free radical polymerization. The resulting NC gels exhibit high Structural Homogeneity, superior elongation with near-complete recovery, good swellability, and rapid deswelling in response to temperature changes.
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Nanocomposite Hydrogels: A Unique Organic–Inorganic Network Structure with Extraordinary Mechanical, Optical, and Swelling/De‐swelling Properties
Advanced Materials, 2002Co-Authors: Kazutoshi Haraguchi, Toru TakehisaAbstract:Novel nanocomposite hydrogels (NC gels) with a unique organic-inorganic (clay) network structure (see Figure) have been synthesized by in-situ free radical polymerization. The resulting NC gels exhibit high Structural Homogeneity, superior elongation with near-complete recovery, good swellability, and rapid deswelling in response to temperature changes.
Kazutoshi Haraguchi - One of the best experts on this subject based on the ideXlab platform.
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nanocomposite hydrogels a unique organic inorganic network structure with extraordinary mechanical optical and swelling de swelling properties
Advanced Materials, 2002Co-Authors: Kazutoshi Haraguchi, Toru TakehisaAbstract:Novel nanocomposite hydrogels (NC gels) with a unique organic-inorganic (clay) network structure (see Figure) have been synthesized by in-situ free radical polymerization. The resulting NC gels exhibit high Structural Homogeneity, superior elongation with near-complete recovery, good swellability, and rapid deswelling in response to temperature changes.
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Nanocomposite Hydrogels: A Unique Organic–Inorganic Network Structure with Extraordinary Mechanical, Optical, and Swelling/De‐swelling Properties
Advanced Materials, 2002Co-Authors: Kazutoshi Haraguchi, Toru TakehisaAbstract:Novel nanocomposite hydrogels (NC gels) with a unique organic-inorganic (clay) network structure (see Figure) have been synthesized by in-situ free radical polymerization. The resulting NC gels exhibit high Structural Homogeneity, superior elongation with near-complete recovery, good swellability, and rapid deswelling in response to temperature changes.
Masamichi Ippommatsu - One of the best experts on this subject based on the ideXlab platform.
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fabrication of large sized silica monolith exceeding 1000 ml with high Structural Homogeneity
IEEE Journal of Solid-state Circuits, 2013Co-Authors: Riichi Miyamoto, Yukiko Ando, Chie Kurusu, Kazuki Nakanishi, Masamichi IppommatsuAbstract:: Reproducible fabrication of the hierarchically porous monolithic silica in a large volume exceeding 1000 mL has been established. By the hydrothermal enlargement of the fully accessible small pores to exceed 50 nm in diameter, the capillary force emerged on solvent evaporation was dramatically reduced, which allowed the preparation of crack-free monoliths with evaporative solvent removal under an ambient pressure. The local temperature inHomogeneity within a reaction vessel in a large volume was precisely controlled to cancel the heat evolved by the hydrolysis reaction of tetramethoxysilane and that consumed to melt ice cubes dispersed in the solution, resulting in large monolithic silica pieces with improved Structural Homogeneity. Homogeneity of the pore structure was confirmed, both on macro- and mesoscales, using SEM, mercury intrusion, and nitrogen adsorption/desorption measurements. Furthermore, the deviations in chromatographic performance were examined by evaluating multiple smaller monolithic columns prepared from the monolithic silica pieces cut from different parts of a large monolith. All the daughter columns thus prepared exhibited comparable performances to each other to prove the overall Homogeneity of the mother monolith. Preliminary results on high-speed separation of peptides and proteins by the octadecylsilylated silica monolith of the above production have also been demonstrated.
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Fabrication of large‐sized silica monolith exceeding 1000 mL with high Structural Homogeneity
Journal of separation science, 2013Co-Authors: Riichi Miyamoto, Yukiko Ando, Chie Kurusu, Kazuki Nakanishi, Hong-zhi Bai, Masamichi IppommatsuAbstract:Reproducible fabrication of the hierarchically porous monolithic silica in a large volume exceeding 1000 mL has been established. By the hydrothermal enlargement of the fully accessible small pores to exceed 50 nm in diameter, the capillary force emerged on solvent evaporation was dramatically reduced, which allowed the preparation of crack-free monoliths with evaporative solvent removal under an ambient pressure. The local temperature inHomogeneity within a reaction vessel in a large volume was precisely controlled to cancel the heat evolved by the hydrolysis reaction of tetramethoxysilane and that consumed to melt ice cubes dispersed in the solution, resulting in large monolithic silica pieces with improved Structural Homogeneity. Homogeneity of the pore structure was confirmed, both on macro- and mesoscales, using SEM, mercury intrusion, and nitrogen adsorption/desorption measurements. Furthermore, the deviations in chromatographic performance were examined by evaluating multiple smaller monolithic columns prepared from the monolithic silica pieces cut from different parts of a large monolith. All the daughter columns thus prepared exhibited comparable performances to each other to prove the overall Homogeneity of the mother monolith. Preliminary results on high-speed separation of peptides and proteins by the octadecylsilylated silica monolith of the above production have also been demonstrated.
Riichi Miyamoto - One of the best experts on this subject based on the ideXlab platform.
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fabrication of large sized silica monolith exceeding 1000 ml with high Structural Homogeneity
IEEE Journal of Solid-state Circuits, 2013Co-Authors: Riichi Miyamoto, Yukiko Ando, Chie Kurusu, Kazuki Nakanishi, Masamichi IppommatsuAbstract:: Reproducible fabrication of the hierarchically porous monolithic silica in a large volume exceeding 1000 mL has been established. By the hydrothermal enlargement of the fully accessible small pores to exceed 50 nm in diameter, the capillary force emerged on solvent evaporation was dramatically reduced, which allowed the preparation of crack-free monoliths with evaporative solvent removal under an ambient pressure. The local temperature inHomogeneity within a reaction vessel in a large volume was precisely controlled to cancel the heat evolved by the hydrolysis reaction of tetramethoxysilane and that consumed to melt ice cubes dispersed in the solution, resulting in large monolithic silica pieces with improved Structural Homogeneity. Homogeneity of the pore structure was confirmed, both on macro- and mesoscales, using SEM, mercury intrusion, and nitrogen adsorption/desorption measurements. Furthermore, the deviations in chromatographic performance were examined by evaluating multiple smaller monolithic columns prepared from the monolithic silica pieces cut from different parts of a large monolith. All the daughter columns thus prepared exhibited comparable performances to each other to prove the overall Homogeneity of the mother monolith. Preliminary results on high-speed separation of peptides and proteins by the octadecylsilylated silica monolith of the above production have also been demonstrated.
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Fabrication of large‐sized silica monolith exceeding 1000 mL with high Structural Homogeneity
Journal of separation science, 2013Co-Authors: Riichi Miyamoto, Yukiko Ando, Chie Kurusu, Kazuki Nakanishi, Hong-zhi Bai, Masamichi IppommatsuAbstract:Reproducible fabrication of the hierarchically porous monolithic silica in a large volume exceeding 1000 mL has been established. By the hydrothermal enlargement of the fully accessible small pores to exceed 50 nm in diameter, the capillary force emerged on solvent evaporation was dramatically reduced, which allowed the preparation of crack-free monoliths with evaporative solvent removal under an ambient pressure. The local temperature inHomogeneity within a reaction vessel in a large volume was precisely controlled to cancel the heat evolved by the hydrolysis reaction of tetramethoxysilane and that consumed to melt ice cubes dispersed in the solution, resulting in large monolithic silica pieces with improved Structural Homogeneity. Homogeneity of the pore structure was confirmed, both on macro- and mesoscales, using SEM, mercury intrusion, and nitrogen adsorption/desorption measurements. Furthermore, the deviations in chromatographic performance were examined by evaluating multiple smaller monolithic columns prepared from the monolithic silica pieces cut from different parts of a large monolith. All the daughter columns thus prepared exhibited comparable performances to each other to prove the overall Homogeneity of the mother monolith. Preliminary results on high-speed separation of peptides and proteins by the octadecylsilylated silica monolith of the above production have also been demonstrated.
Celso A. Bertran - One of the best experts on this subject based on the ideXlab platform.
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Investigation of citric acid-assisted sol-gel synthesis coupled to the self-propagating combustion method for preparing bioactive glass with high Structural Homogeneity.
Materials science & engineering. C Materials for biological applications, 2018Co-Authors: João Henrique Lopes, Otto V. M. Bueno, Italo Odone Mazali, Celso A. BertranAbstract:Abstract In this research, the mechanism of an efficient strategy for the synthesis of 58S bioglass with high Structural Homogeneity by a citric acid assisted sol-gel route was investigated. This is an interesting approach to prepare bioactive glass via the sol-gel method with application potential in bone tissue engineering and also for the development of new biomedical devices. Herein, 58S bioglass was synthesized by two routes: conventional sol-gel method (CSG) and citric acid assisted sol-gel route coupled to the self-propagating combustion method (SPC). The effects of citric acid on the temperature required for 58S vitreous consolidation, long- and short-range ordering were investigated by several analysis techniques. Results suggested that citric acid molecules serve as an effective molecular template formed by molecular network raised from intermolecular forces, especially the hydrogen bonds, resulting from the chemical interactions between the COOH and hydroxyl groups (water, ethanol, P OH, Si OH). In this scenario, citric acid controls the phase segregation during the drying and combustion steps of the gel in the SPC method by establishing chemical interactions (hydrogen bonds) with the superficial silanol groups present on the small-sized silica nanoparticles present in the sol governing their growth. Besides these mentioned features, the self-propagating combustion behavior exhibited by the nitrate-citrate in the SPC xerogel during the combustion step allowed the removal of the organic load and the consolidation of the vitreous structure at a temperature considerably lower than the sample obtained by the CSG method. Consequently, the SPC method leads to the formation of a glass structure with high Homogeneity for the 58S, whereas the conventional sol-gel method produces a matrix enriched with calcium phosphate crystalline nuclei - glass-ceramic.
