Matrix chemistry

R. Jayaram, M.K.Miller, An atom probe study of grain boundary and matrix chemistry in microalloyed NiAl, Acta metall.mater. 42 1561 (1994)... 

Metal atom matrix chemistry. Correlation of bonding with chemisorbed molecules. G. A. Ozin, Acc. Chem. Res., 1977,10, 21-26 (32). 

Ferrer, M.L., Yuste, L., Rojo, F. and Del Monte, F. (2003) Biocompatible sol-gel route for encapsulation of living bacteria in organically modified silica matrixes. Chemistry of Materials 15, 3614-3618. 

Bill, J. and Aldinger, F. (2006) Heterogeneous nucleation of ZnO using gelatin as the organic matrix. Chemistry of Materials, 18, 2016-2020. 

Theberge, R. Bertrand, M.J. Beam-Induced Dehalogenation in LSIMS Effect of Halogen Type and Matrix Chemistry. J. Mass Spectrom. 1995, 30, 163-171. 

This article is a comprehensive treatment of it complexes of all main-group elements including their synthesis, structure, and bonding, and covers the literature up to 1985. Compounds described here have been characterized by X-ray or electron diffraction, or at least by conclusive IR or NMR data. No matrix chemistry will be mentioned. 

Silicon monosulfide, SiS, is formed if CS2 gas is passed over silicon heated to 1270 K. Its matrix chemistry shows a strong resemblance to that of SiO. Thus, it reacts with CI2 to yield SSiCl2 and with O atoms to form OSiS, the silicon analog of carbonyl sulfide. The latter molecule is of interest since it is shown to contain both Si=0 and Si=S double bonds, while both experimental observations and ab initio calculations confirm the double bond nature of the Si=S linkage in SSiCb. 

Rietmeijer F. J. M. (1989) Ultrafine-grained mineralogy and matrix chemistry of olivine-rich chondritic interplanetary dust particles. Proc. 19th Lunar Planet. Set Conf. 513-521. 

The bulk analysis of /3-SiC whiskers shows the least variation in chemistry. In some whiskers, the residual metals content can vary, most likely, as a result of additives that used as catalysts during synthesis. These include iron, cobalt, and chromium. Studies by Karasek et al. [56] have shown that the physical properties of silicon carbide whisker-reinforced composites do not correlate to the bulk properties of the whiskers significantly. This lack of significant correlation is mainly due to the fact that the important phase chemistry of the whisker-matrix interface is controlled by the matrix chemistry and the surface chemistry of the whiskers. There seems to be little impact of the diffusion of materials into or out of the bulk whisker material. 

Many food processes, which affect food quality and stability, are diffusion controlled (Karel et al., 1994 Roos, 1995). Transport of key penetrants such as water into or out of a polymeric food matrix can play a critical role in food quality and stability. Water is one of the major components and a very good plasticizer in foods. The quality and stability of dehydrated products, multi-domain foods, and the performance of biofilms and encapsulation and controlled release technologies are affected by moisture transport. The rates of molecular mobility and diffusion-limited reactions strongly depend on the factors surrounding the food. Temperature and water activity (fl ) pl y significant roles in penetrant diffusion. The physical state of the carrier matrix, chemistry, size, and structure of diffusing molecule and specific... 

The mechanisms of formation of this carbon-rich layer at the fibre-matrix interfaces have been studied [36,71,75,77]. It has been proposed that the carbon layer is the result of a fortunate combination of silicate matrix chemistry and non-stoichiometric/non-crystalline fibre stmcture [71], The solid-state reaction between the SiC in the fibre and oxygen from the glass and the fibre surface can be written as ... 

McIntosh, D., Khabashesku, V. N., and Barrera, E. V. 2006. Nanocomposite fiber systems processed from fluorinated single-walled nanotubes and a polypropylene matrix. Chemistry of Materials 18 4561-4569. 

Available compounds of this type include polyolefin backbones with carboxylic acid, polyacrylic acid end groups and maleic anhydride, polybutadiene, also functionalized with maleic anhydride, and unsaturated polymeric silane compounds. As with other coatings, reactions depend on the filler/coating/matrix chemistry. Carboxylic acid groups will react as for their short chain counterparts, unsaturated polymer chains will enter into crosslinking processes, for example during the vulcanization of rubber, and maleic anhydride groups lead to reaction with the filler surface. 

The microdrops for this resin are allowed to cure at room temperature for 24 h, and are then post-cured for 2 h at 75°C (165°F) and for 2 h at 125°C (255°F). (This procedure would be adjusted depending on the matrix chemistry.) After curing, the fiber is affixed to an aluminum plate and kept in a desiccator to wait testing. 

Califano, J.R and C.A. Remhart-Kmg. 2008. A balance of substrate mechanics and matrix chemistry regulates endothelial cell network assembly. Cellular and Molecular Bioengineering 1 (2-3) 122-32. 

When the substrate was reinforced with carbon fibre, the plateau results obtained depended heavily on the type of adhesive being used Cytec-Fiberite film adhesive FM -73M (curing at 120°C) and room-temperature curing Loctite Aerospace paste adhesive EA 9309. The composite matrix chemistry exerted significantly less influence. 

Blackman et al. [71] compared the use of conventional abrasion pretreatments with corona discharge and oxygen plasma treatments. Again, the need to optimise the surface polarity was confirmed. As in the previous work, both adhesive and matrix chemistry influenced the optimum plasma conditions. For carbon/PEEK... 

Zern MA (ed) (1993) Extracellular matrix chemistry, biology and pathobiology with emphasis on the liver. Marcel Dekker Ltd, Oxford... 

Since the early work, the matrix chemistry of cyclobutadiene has attracted less attention, although some interesting results have been obtained. Diazoketone 33 gave cyclopropenylketene 35, cyclopenta-dienone (36), and tricyclopentanone 37 when photolyzed at >310 nm in argon matrices, presumably via the ketocarbene 34, which was not, however, observed directly (Scheme 8). Ketene 35 was then further photolyzed at 254 nm, yielding cyclobutadiene (30), presumably via carbene 38. At this shorter wavelength, 36 was photostable, but the tricyclopentanone 37 also gave mainly 30, but in a very slow reaction. 

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