The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Mohammad L Hassan - One of the best experts on this subject based on the ideXlab platform.
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physical and mechanical properties of Microcrystalline cellulose prepared from agricultural residues
Carbohydrate Polymers, 2007Co-Authors: Mohamed Elsakhawy, Mohammad L HassanAbstract:Microcrystalline cellulose (MCC) was prepared from local agricultural residues, namely, bagasse, rice straw, and cotton stalks bleached pulps. Hydrolysis of bleached pulps was carried out using hydrochloric or sulfuric acid to study the effect of the acid used on the properties of the produced Microcrystalline cellulose such as degree of polymerization (DP), crystallinity index (CrI), crystallite size, bulk density, particle size, and thermal stability. The mechanical properties of tablets made from Microcrystalline cellulose of different agricultural residues were tested and compared to a commercial-grade MCC. The use of rice straw pulp in different proportions as a source of silica to prepare silicified Microcrystalline cellulose (SMCC) was investigated. The effect of the percent of rice straw added on the mechanical properties of tablets before and after wet granulation was studied.
Kenji Yamamoto - One of the best experts on this subject based on the ideXlab platform.
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Microcrystalline Silicon Solar Cells
Practical Handbook of Photovoltaics, 2020Co-Authors: Kenji YamamotoAbstract:Publisher Summary This chapter provides an overview of the Microcrystalline silicon solar cells. Microcrystalline silicon solar cells formed by plasma chemical vapor deposition (CVD) at low temperatures are assumed to have a shorter lifetime than single-crystal cells, and it is common to employ a p-i-n structure including an internal electric field in the same way as in amorphous solar cell. A p-i-n type Microcrystalline silicon solar cell is formed by a process fairly similar to that of an amorphous solar cell. These cells can be divided into p-i-n and n-i-p types according to the film deposition order, although the window layer of the solar cell is the p-type layer in both the cases. This chapter discusses thin-film polycrystalline silicon solar cells with very small grain size formed at low temperatures (referred to as Microcrystalline silicon solar cells). The chapter discusses the carrier transport in Microcrystalline silicon thin-film solar cells as well as high-speed fabrication of Microcrystalline silicon films. The light-trapping effect of Microcrystalline silicon cells is also explained in detail.
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Microcrystalline Silicon Solar Cells
Practical Handbook of Photovoltaics: Fundamentals and Applications, 2003Co-Authors: Kenji YamamotoAbstract:This chapter provides an overview of the Microcrystalline silicon solar cells. Microcrystalline silicon solar cells formed by plasma chemical vapor deposition (CVD) at low temperatures are assumed to have a shorter lifetime than single-crystal cells, and it is common to employ a p-i-n structure including an internal electric field in the same way as in amorphous solar cell. A p-i-n type Microcrystalline silicon solar cell is formed by a process fairly similar to that of an amorphous solar cell. These cells can be divided into p-i-n and n-i-p types according to the film deposition order, although the window layer of the solar cell is the p-type layer in both the cases. This chapter discusses thin-film polycrystalline silicon solar cells with very small grain size formed at low temperatures (referred to as Microcrystalline silicon solar cells). The chapter discusses the carrier transport in Microcrystalline silicon thin-film solar cells as well as high-speed fabrication of Microcrystalline silicon films. The light-trapping effect of Microcrystalline silicon cells is also explained in detail.
Christian Coddet - One of the best experts on this subject based on the ideXlab platform.
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structural study of iron based microstructured and nanostructured powders sprayed by hvof thermal spraying
Surface & Coatings Technology, 2005Co-Authors: M. Cherigui, Nouredine Fenineche, Christian CoddetAbstract:Abstract The paper deals with the structure and magnetic properties of coatings obtained by HVOF spraying using Microcrystalline and nanocrystalline powders. For FeNb coatings sprayed using Microcrystalline powders, X-ray diffraction showed partially amorphous structure. For FeSi ones, the structure was completely crystalline. For FeSi coatings sprayed using nanocrystalline powders, X-ray diffraction showed the crystalline size was lower than that in the coating obtained from Microcrystalline powder. For FeSiB alloys, the structure is crystalline with a small quantity of amorphous phase. FeSi coatings behaved as a soft ferromagnetic. On other hand, the FeSiB coatings presented.
John N. Staniforth - One of the best experts on this subject based on the ideXlab platform.
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Surface Energy of Microcrystalline Cellulose Determined by Capillary Intrusion and Inverse Gas Chromatography
Aaps Journal, 2008Co-Authors: D. Fraser Steele, Mike Tobyn, John N. Staniforth, R. Christian Moreton, Paul M. Young, Stephen EdgeAbstract:Surface energy data for samples of Microcrystalline cellulose have been obtained using two techniques: capillary intrusion and inverse gas chromatography. Ten Microcrystalline cellulose materials, studied using capillary intrusion, showed significant differences in the measured surface energetics (in terms of total surface energy and the acid–base characteristics of the cellulose surface), with variations noted between the seven different manufacturers who produced the Microcrystalline cellulose samples. The surface energy data from capillary intrusion was similar to data obtained using inverse gas chromatography with the column maintained at 44% relative humidity for the three samples of Microcrystalline cellulose studied. This suggests that capillary intrusion may be a suitable method to study the surface energy of pharmaceutical samples.
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Physicochemical and Mechanical Evaluation of a Novel High Density Grade of Silicified Microcrystalline Cellulose
Drug Development and Industrial Pharmacy, 2004Co-Authors: D. Fraser Steele, Stephen Edge, Ansong Chen, Mike Tobyn, John N. StaniforthAbstract:High density Microcrystalline cellulose (MCC) is a relatively free flowing grade of MCC that finds use in direct compression tableting and hard gelatin capsule filling applications. Silicified high density Microcrystalline cellulose has recently been introduced. This material has been compared to other grades of MCC and previously silicified Microcrystalline cellulose (SMCC). The results suggest that, as observed for other grades of SMCC, the material exhibits no detectable chemical or polymorphic differences to standard material, some improvement in flow characteristics, but shows considerably enhanced mechanical properties.
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The mechanical properties of compacts of Microcrystalline cellulose and silicified Microcrystalline cellulose
International Journal of Pharmaceutics, 2000Co-Authors: Stephen Edge, D. Fraser Steele, Ansong Chen, Mike Tobyn, John N. StaniforthAbstract:The mechanical properties of compacts of unlubricated Microcrystalline cellulose and silicified Microcrystalline cellulose were evaluated using the diametric tensile test. The results suggested that, under comparable testing conditions, compacts of silicified Microcrystalline cellulose exhibited greater strength than those of Microcrystalline cellulose. In addition to enhanced strength, silicified Microcrystalline cellulose compacts exhibited greater stiffness and required considerably more energy for tensile failure to occur. Comparison of the data with that obtained for a dry blend of silicon dioxide/Microcrystalline cellulose suggested that the functionality benefits of silicification were not due to a simple composite material model.
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The Use of a Modified Resin for Studying the Internal Structure of Microcrystalline Cellulose Particles
Micron, 1998Co-Authors: Stephen Edge, Mike Tobyn, U. J. Potter, D. F. Steele, John N. StaniforthAbstract:Abstract The use of a modified resin which allows the study of the internal structure of Microcrystalline cellulose is described. Electron probe microanalysis and elemental X-ray mapping suggest that it is possible to identify cellulose within cross-sectioned Microcrystalline cellulose particles.
Mohamed Elsakhawy - One of the best experts on this subject based on the ideXlab platform.
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physical and mechanical properties of Microcrystalline cellulose prepared from agricultural residues
Carbohydrate Polymers, 2007Co-Authors: Mohamed Elsakhawy, Mohammad L HassanAbstract:Microcrystalline cellulose (MCC) was prepared from local agricultural residues, namely, bagasse, rice straw, and cotton stalks bleached pulps. Hydrolysis of bleached pulps was carried out using hydrochloric or sulfuric acid to study the effect of the acid used on the properties of the produced Microcrystalline cellulose such as degree of polymerization (DP), crystallinity index (CrI), crystallite size, bulk density, particle size, and thermal stability. The mechanical properties of tablets made from Microcrystalline cellulose of different agricultural residues were tested and compared to a commercial-grade MCC. The use of rice straw pulp in different proportions as a source of silica to prepare silicified Microcrystalline cellulose (SMCC) was investigated. The effect of the percent of rice straw added on the mechanical properties of tablets before and after wet granulation was studied.
