Colloidal systems glasses

Not all colloid systems are stable. The most stable involve solid dispersion media, since movement through a solid host will be slow. Emulsions also tend to be stable think, for example, about a glass of milk, which is more likely to decompose than undergo the destructive process of phase separation. Aerosols are not very stable although a water-based polish generates a liquid-in-air colloid, the particles of liquid soon descend through the air to form a pool of liquid on the table top. Smoke and other solid-in-gas aerosols are never permanent owing to differences in density between air and the dispersed phase. 

Figure 1.2 Schematic representation of colloid systems of various types (a) kaoli nite, (b) Plaster of Paris, cement, asbestos, (c) polymer latices, (d) network structures, e.g. porous glass, gels.

Solid colloidal systems like ruby glass (which may be considered as a solidified colloidal suspension of individual gold particles in molten glass) or like a solid foam are excluded by this definition. 

Pashley R.M., Israelachvili J.N. DLVO and hydration forces between mica surfaces in Mg " ", Ca +, Sr, and Ba + chloride solutions. J. Colloid Interface Sci. 1984 97 446 55 Pashley R.M. The effects ofhydrated cation adsorption on surface forces between mica crystals and its relevance to colloidal systems. Chem. Scr. 1985 25 22-27 Petekidis G., Vlassopoulos D., Pusey P.N. Yielding and flow of colloidal glasses. Faraday Disc. 2003 123 287-302... 

When a latex product is frozen, ice crystals tend to undergo phase separation from the colloidal system therefore, the concentration of polymer particles in the fluid phase continues to increase with the progress of the freezing process. Sooner or later, phase inversion will occur and the probability for the coagulation of polymer particles to take place increases significantly. This is especially true for polymer particles with a glass transition temperature lower than the freezing temperature or with insufficient stabilization by surfactants or protec-... 

Dense colloidal systems, such as hquids and glasses, are considered soft (or more accurately compliant ) matter they have small but nonzero elastic moduli. Consider for simphcity first the equation of state, eq. (3), at low packing fraction, where it becomes that of an ideal gas ... 

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