Application of Extended DLVO Theory: I. Stability of Rutile Suspensions

✍ Scribed by Hiroki Yotsumoto; Roe-Hoan Yoon

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 399 KB
• Volume: 157
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1993.1205

✦ Synopsis

The DLVO theory has been used successfully to describe the stability of synthetic rutile suspensions in (\mathrm{NaCl}) solutions of 2 (\times 10^{-3} M) and below. At higher concentrations, the suspension is more stable than predicted by the theory. At concentrations above (1 M), the suspension is redispersed even at its IEP. It is believed that the additional stability is due to the secondary hydration force associated with the hydrated counter ions adsorbed on rutile. In order to account for the increased stability of the rutile suspension in high electrolyte concentrations, the DLVO theory has been extended by including a hydration energy term. The hydration energy can be described by a double-exponential function, the parameters of which have been determined based on turbidity measurements. o 1993 Acadenic Press, Inc.