Download Glass IIITreatise on Materials Science and Technology by Minoru Tomozawa and Robert H. Doremus (Eds.) PDF

By Minoru Tomozawa and Robert H. Doremus (Eds.)

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Extra info for Glass IIITreatise on Materials Science and Technology

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Indepen­ dent of composition, silicate glasses show a very small contact angle toward water immediately after treatment in a glow discharge, but a rapid increase of contact angle with time. These changes result from surface reactions with H 2 0 and air and a surface reconstruction, that is, from a decrease of ySL (Fig. 27). The rate of change of the glass surface after treatment in a glow discharge depends on the discharge conditions (energy density, kind of gas, pressure, and treatment time). With treatment in a plasma a number of radicals are formed in the surface region and also in the bulk which are detectable by ESR spectroscopy (Griscom, 1976; Friebele and Griscom, 1979; Stapel­ brock and Griscom, 1979).

Corrosive reactions, which alter chemically the surface zone in the bulk phase and can lead to successive dissolution of the glass. These processes play a decisive role in surface purification and ion exchange processes and determine the chemical durability of the glasses. The chemical modification reactions at silicate glass surfaces re­ place the following surface groups or atoms. 1. ; Y is Si, B, Al etc; and R is a halogen or an organic group. It is assumed that the dissociation energy of an X s - 0 46 H.

5) lead at low temperatures to the Freundlich adsorption isotherm: St =Apllm; A,m = constants (8) For a distribution function: p(q) = aq exp[-b(q - c)2] (9) the Dubinin-Raduskevie isotherm results, which is applicable to systems with pores: θ( = exp[-B(RT In pjp)2] (10) a, b, c, and B are constants; ps is the saturation vapor pressure. In place of the Langmuir isotherm other local isotherms can be introduced into Eqs. (4) and (5); these isotherms account for ex­ change between adsorbed atoms. From the adsorption isostere In/?

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