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| Titel: |
Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation |
| Auteur: |
kvarla Jiøí Grohol Milan Sisol Martin |
| Verschenen in: |
Acta Montanistica Slovaka |
| Paginering: | Jaargang 6 (2001) nr. 4 pagina's 293-297 |
| Jaar: |
2001 |
| Inhoud: |
The coagulation rate of colloidal silica (synthetic SiO2) spheres in aqueous solution of hexadecyltrimety-amonium bromide (CTAB) was investigated at the concentration scale of 10-5 - 5×10-4 M and pH of 4.7 8.1. The computer-controlled spectrophotometer was used to detect absorbance of the colloidal system as a function of time. From the absorbance-vs.-time dependence, the coagulation rate constant, stability ratio and critical concentration of coagulation (c.c.c.) have been determined by using a linearization and approximation method. Both methods provided c.c.c. values of the initially hydrophilic silica spheres to be ca. 2×10-4 M CTAB (pH 6.8), suggesting an adsorption-induced hydrophobization of their surface by CTAB cations. A slight influence of pH was also observed, probably related to the ionization degree of the CTAB cations. |
| Uitgever: |
Technical University of Kosice, the Faculty of Mining, Ecolo |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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