A Course in Inorganic Preparations by Henderson W. E.

By Henderson W. E.

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In these cases it is necessary to distribute in regular intervals very small amounts of substance on a surface. It is usually enough to have from 1 to 4 monolayers. In this case each atom in a monolayer can take part in reaction. This is not obtained using traditional methods of impregnation. Some substances change color when in contact with components of a gas phase: water vapor for example. This property has been used to create a humidity indicator in gas environments using a V-containing silica gel.

This is not obtained using traditional methods of impregnation. Some substances change color when in contact with components of a gas phase: water vapor for example. This property has been used to create a humidity indicator in gas environments using a V-containing silica gel. Vanadium oxide changes color depending on the extent of hydration, but the hydration reaction is slow. For this reason V2O5 has not been used as a humidity indicator of gases. But the sample of V-containing silica has good indicator properties in contact with water vapor.

However, the rate of evaporation must be carefully controlled; if it is too fast then “holes” will appear in the polymer shell which forms around the oil droplets. In fact, whether such a shell forms or not, depends on the polymer phase separation process itself, and the relative magnitudes of the various interfacial tensions involved. There are three such interfacial tensions: γ po, γ pw, and γ ow, where p = polymer, o = oil and w = water. If one wishes to form a shell then, in effect, it is imperative that γ ow is not smaller than γ po or γ pw.

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