Chemistry of Silica - Solubility, Polymerization, Colloid by Ralph K. Iler

By Ralph K. Iler

This e-book applies theoretical floor chemistry to knowing the motion of surfactants in enhancing interfacial phenomena. It surveys the structural forms of commercially to be had surfactants and discusses interfacial phenomena, the physicochemical ideas underlying the motion of surfactants in each one phenomenon, and the impact of structural adjustments within the surfactants and environmental alterations on their motion. Tables of information on a number of interfacial houses of surfactants, compiled and calculated from the most recent medical literature, are incorporated. This publication offers worthwhile advice in learn and layout efforts via giving a transparent realizing of rules and ideas of colloid chemistry as utilized to clay platforms. up to date and enlarged, this version comprises new info on floor characterization and adsorption mechanisms; fresh leads to the realm of clay-organic interplay, the intercalation and intersalation of kaolinite minerals; and elevated realization to the prospective position of clays in organic evolution.
entrance topic
• Preface
• desk of Contents
1. The incidence, Dissolution, and Deposition of Silica
2. Water-Soluble Silicates
three. Polymerization of Silica
four. Colloidal Silica-Concentrated Sols
five. Silica Gels and Powders
6. the outside Chemistry of Silica
7. Silica in Biology
writer Index
topic Index

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Additional resources for Chemistry of Silica - Solubility, Polymerization, Colloid and Surface Properties and Biochemistry

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Solubility of Cristobalite and Tridymite There is some question whether true equilibrium can be established for cristobalite and tridymite. There appears to be no instance where these crystals have been grown under hydrothermal conditions in preference to quartz. Fournier and Rowe (137) believed that precipitation of crystalline silica under hydrothermal conditions would generally result in quartz. For this reason, in their study of the solubility of cristobalite, they left water in contact with the solid for long times without changing temperature.

The Si(OH), is desorbed into solution. 3. Si(OH), is adsorbed onto the surface at equilibrium as the reverse process occurs, folloi+ed b\ condensation and addition of SiO, to the surface. The Solubility of Silica 35 He formulated the following equations. For the adsorption of Si(OH), the equation is nods = n,bc 1 + bc - where nods = surface concentration of adsorbed Si(OH), no = surface concentration of complete mololayer c = silicic acid concentration in solution b = adsorption constant Adsorption occurs only on the bare surface not covered by Si(OH),: where nH f = = k = A = R T = = silicic acid released by hydrolysis per unit of surface area time kinetic constant for hydrolysis activation energy of hydrolysis gasconstant temperature ( O K ) It is assumed adsorption equilibrium is established rapidly relative to the other steps, Thus equation I can be inserted into equation 2: dn, - - - dt 1 n0 + bc kexp -6) (3) Condensation involves adsorbed molecules only: dnc dr where n, k' = A' = = = -nadsk' exp -(&) (4) silicic acid condensed per unit of surface area kinetic constant for condensation activation energy for condensation Since temperature is assumed constant and values of k , k ' .

Alexanian ( I 19) found by electron diffraction that quartz possesses a surface layer of amorphous silica about 100 A thick, which is removed by H F but is re-formed in ambient humidity. Waddams found that the quartz surface in water released “mosaic” silica, presumably as particles of colloidal size, since they scattered light (120). This was confirmed by Sakabe et al. 3 microns in size. Stober and Arnold (122) found that the amount of silica released was much more than a monomolecular layer. and that it decreased with successive changes of water.

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