Glass, inorganic relationships

Figure 14.4 Relationship between hardnesses of various inorganic glasses and their viscosities. Data are from Prod homme (1968).

These ceramic membranes are relatively easy to operate for filtering particulates. The pressure drop across the thickness of a membrane element and the gas flow rate follows a linear or nearly linear relationship. It has been found, however, that not all inorganic membranes are suitable for clean room air filtration. Glass membranes, for example, suffer from the problem of particle shedding under mechanical shock conditions [Jensen and Goldsmith, 1987]. Sometimes high moisture content in the filtered air can be a problem. Some chemical treatments to ceramic membranes prior to their utilization as... 

Mohandas and co-workers (18), confirming previous findings of Weiss and Blumenson (19), have also shown that cells in an environment free of adsorbable proteins (which rapidly modify the surface properties of polymeric or inorganic substrates) will exhibit a similar direct relationship between their adhesion and the critical surface tension of the surface they contacted. DiflFerential adhesion of red blood cells was measured by determining the fraction of cells retained on a surface after the application of well-calibrated shear stresses (IS). In protein-free experiments, the red cells (themselves dominated in adhesive interactions by their protein membranes) had greatest adhesion to glass, intermediate adhesion to polyethylene and siliconized glass, and least adhesion to Teflon. 

The viscosity-temperature relationship of glass is shown in Rgure 8.4 (19). A criterion sometimes used for Tg for both inorganic and organic polymers is the temperature at which the melt viscosity reaches a value of 1 x 10 poises... 

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