Adsorption-Induced Aggregation of Colloidal Particles in Binary Mixtures: Modeling the Pair Free Energy
✍ Scribed by J.-M. Petit; B.M. Law; D. Beysens
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 209 KB
- Volume
- 202
- Category
- Article
- ISSN
- 0021-9797
No coin nor oath required. For personal study only.
✦ Synopsis
homogeneous mixture of water and 2,6-lutidine near the Reversible aggregation of charged colloids in binary mixtures phase separation temperature, T cx , of the liquid mixture. This was first observed in 1985 by changing the temperature of the mixture has a lower consolute temperature at T c Å 34ЊC for suspension. An adsorbed layer was found to form around the cola critical lutidine mass fraction of m c Å 0.286 (5). Beysens loids with increasing temperature. Most of the tentative explanaet al. observed an unusual aggregation behavior of the silica tions have focused on either phase transitions or surface transispheres for lutidine-poor mixtures in the one phase region tions, such as the prewetting transition or capillary condensation.
at the aggregation temperature T a which occurs below the A simpler hypothesis is that the counter ions in the adsorbed coexistence temperature (T a õ T cx ). For this system silica layer progressively screen the surface charge as the temperature dissociates weakly in the aqueous medium, giving rise to a is increased toward the aggregation temperature. We model the negatively charged colloidal surface. The lutidine acts as a pair free energy for this situation by examining the influence of an adsorbed layer on the repulsive potential and by using the weak base because of the lone pair of electrons on the nitro-Dzyaloshinskii, Lifshitz, and Pitaevskii theory to represent the gen atom of the lutidine and the positively charged complex attractive dispersion interactions.