The Experts below are selected from a list of 6 Experts worldwide ranked by ideXlab platform
James C. Fajardo - One of the best experts on this subject based on the ideXlab platform.
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Microwave Molecular Sieves Synthesis and Capillary Crystal Growth by Geometric Confinement.
MRS Proceedings, 2011Co-Authors: Steven Bolaji Ogunwumi, John F. Wight, James C. FajardoAbstract:ABSTRACTMicrowave heating is an alternate means for material processing. The technique is promising for the accelerated synthesis of new materials. Microwave molecular sieves synthesis is combined with Capillary confinement as a novel synthetic method. It is successfully demonstrated in the preparation of small ZSM-5 Crystals by microwave hydrothermal synthesis within 1–1.7 μm channels of a Capillary bundle. The geometric and spatial confinement offered by the Capillary is expected to define and control the resulting Crystal size distribution and orientation.MCM-41, a mesoporous molecular sieve with a uni-dimensional regular array of hexagonal channels is investigated as a candidate for Capillary confinement. The large porous channels of MCM-41(>35 å ) is attractive as a host for promoting inclusions of guest molecules or templates. The successful confinement of MCM-41 represents an important step towards the alignment of molecular sieves in a defined orientation within thin capillaries bundled (less than 5 μm channels). Ultimately, such an approach may be useful for the fabrication of new molecular sieve devices.
T. Fukuda - One of the best experts on this subject based on the ideXlab platform.
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Si1 − xGex fiber Crystals with functionally variant composition grown by micro-pulling-down technique
Journal of Crystal Growth, 1996Co-Authors: N. Schäfer, Kiyoshi Shimamura, T. FukudaAbstract:Abstract Si 1 − x Ge x mixed fiber Crystals with a linear and sinusoidal variation of composition have been grown by the micro-pulling-down technique. The evaluation of the Crystal growth was based on the diffusion-controlled solute transport, which causes the macroscopic segregation and the constitutional supercooling to be suppressed. From the theoretical analysis of one-dimensional steady state on the solute transport inside the Capillary channel, the effective segregation coefficient, k eff , of the solute was found to vary as a function of the Capillary parameter, which was affected by the dimension of Capillary, Crystal pulling rate and solute diffusivity. The chemical composition varying functionally along the Crystal length was obtained by controlling the Crystal pulling rate among the variables of the Capillary parameter while the position of the solid-liquid interface and the diameter of Crystal were maintained uniform during growth.
Steven Bolaji Ogunwumi - One of the best experts on this subject based on the ideXlab platform.
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Microwave Molecular Sieves Synthesis and Capillary Crystal Growth by Geometric Confinement.
MRS Proceedings, 2011Co-Authors: Steven Bolaji Ogunwumi, John F. Wight, James C. FajardoAbstract:ABSTRACTMicrowave heating is an alternate means for material processing. The technique is promising for the accelerated synthesis of new materials. Microwave molecular sieves synthesis is combined with Capillary confinement as a novel synthetic method. It is successfully demonstrated in the preparation of small ZSM-5 Crystals by microwave hydrothermal synthesis within 1–1.7 μm channels of a Capillary bundle. The geometric and spatial confinement offered by the Capillary is expected to define and control the resulting Crystal size distribution and orientation.MCM-41, a mesoporous molecular sieve with a uni-dimensional regular array of hexagonal channels is investigated as a candidate for Capillary confinement. The large porous channels of MCM-41(>35 å ) is attractive as a host for promoting inclusions of guest molecules or templates. The successful confinement of MCM-41 represents an important step towards the alignment of molecular sieves in a defined orientation within thin capillaries bundled (less than 5 μm channels). Ultimately, such an approach may be useful for the fabrication of new molecular sieve devices.
John F. Wight - One of the best experts on this subject based on the ideXlab platform.
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Microwave Molecular Sieves Synthesis and Capillary Crystal Growth by Geometric Confinement.
MRS Proceedings, 2011Co-Authors: Steven Bolaji Ogunwumi, John F. Wight, James C. FajardoAbstract:ABSTRACTMicrowave heating is an alternate means for material processing. The technique is promising for the accelerated synthesis of new materials. Microwave molecular sieves synthesis is combined with Capillary confinement as a novel synthetic method. It is successfully demonstrated in the preparation of small ZSM-5 Crystals by microwave hydrothermal synthesis within 1–1.7 μm channels of a Capillary bundle. The geometric and spatial confinement offered by the Capillary is expected to define and control the resulting Crystal size distribution and orientation.MCM-41, a mesoporous molecular sieve with a uni-dimensional regular array of hexagonal channels is investigated as a candidate for Capillary confinement. The large porous channels of MCM-41(>35 å ) is attractive as a host for promoting inclusions of guest molecules or templates. The successful confinement of MCM-41 represents an important step towards the alignment of molecular sieves in a defined orientation within thin capillaries bundled (less than 5 μm channels). Ultimately, such an approach may be useful for the fabrication of new molecular sieve devices.
N. Schäfer - One of the best experts on this subject based on the ideXlab platform.
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Si1 − xGex fiber Crystals with functionally variant composition grown by micro-pulling-down technique
Journal of Crystal Growth, 1996Co-Authors: N. Schäfer, Kiyoshi Shimamura, T. FukudaAbstract:Abstract Si 1 − x Ge x mixed fiber Crystals with a linear and sinusoidal variation of composition have been grown by the micro-pulling-down technique. The evaluation of the Crystal growth was based on the diffusion-controlled solute transport, which causes the macroscopic segregation and the constitutional supercooling to be suppressed. From the theoretical analysis of one-dimensional steady state on the solute transport inside the Capillary channel, the effective segregation coefficient, k eff , of the solute was found to vary as a function of the Capillary parameter, which was affected by the dimension of Capillary, Crystal pulling rate and solute diffusivity. The chemical composition varying functionally along the Crystal length was obtained by controlling the Crystal pulling rate among the variables of the Capillary parameter while the position of the solid-liquid interface and the diameter of Crystal were maintained uniform during growth.
