surface chemistry


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surface chemistry,

study of chemical reactions in which the reactants are first adsorbed onto a surface medium (see adsorptionadsorption,
adhesion of the molecules of liquids, gases, and dissolved substances to the surfaces of solids, as opposed to absorption, in which the molecules actually enter the absorbing medium (see adhesion and cohesion).
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) that then acts as a catalystcatalyst,
substance that can cause a change in the rate of a chemical reaction without itself being consumed in the reaction; the changing of the reaction rate by use of a catalyst is called catalysis.
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 for the reaction; after the reaction the products are desorbed and the surface is left unchanged. Since the entire reaction takes place on the surface, the amount of surface area of catalyst per unit weight determines the effectiveness of the surface in the reaction. Some silica surfaces have over 200 square meters of surface area per gram. An example of a surface reaction is the reaction of an unsaturated organic molecule with hydrogen on finely divided platinum or with bromine on finely divided silica. Enzymeenzyme,
biological catalyst. The term enzyme comes from zymosis, the Greek word for fermentation, a process accomplished by yeast cells and long known to the brewing industry, which occupied the attention of many 19th-century chemists.
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 reactions can, in principle, also be considered surface reactions, since the reaction takes place on the enzyme surface after the enzyme has bound the reactants; however, usually only heterogeneous (two-phase) reactions are considered true surface reactions, while enzyme reactions are homogeneous (one-phase) systems.
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surface chemistry

[′sər·fəs ‚kem·ə·strē]
(physical chemistry)
The study and measurement of the forces and processes that act on the surfaces of fluids (gases and liquids) and solids, or at an interface separating two phases; for example, surface tension.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In other words, each particle with its specific properties in size, morphology, and surface chemistry passes with a unique velocity through the capillary tube that has been connected from the two ends to two 10-30 kV electrodes.
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For her many contributions to the study of surface chemistry of fibers and their performance, Kay Obendorf, professor of fiber science and apparel design, received the American Association of Textile Chemists and Colorists' 2010 Olney Medal, the organization's highest honor, during its international conference in May.
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