Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation
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...
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| Format: | Article |
| Language: | English |
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Technical University of Kosice
2001-12-01
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| Series: | Acta Montanistica Slovaca |
| Subjects: | |
| Online Access: | http://actamont.tuke.sk/pdf/2001/n4/6skvarla.pdf |
| _version_ | 1818808142362836992 |
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| author | kvarla Jiøí Sisol Martin Grohol Milan |
| author_facet | kvarla Jiøí Sisol Martin Grohol Milan |
| author_sort | kvarla Jiøí |
| collection | DOAJ |
| description | 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. |
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| format | Article |
| id | doaj.art-9eb8c0e811e5446990be853fa877d0e8 |
| institution | Directory Open Access Journal |
| issn | 1335-1788 |
| language | English |
| last_indexed | 2024-12-18T19:36:51Z |
| publishDate | 2001-12-01 |
| publisher | Technical University of Kosice |
| record_format | Article |
| series | Acta Montanistica Slovaca |
| spelling | doaj.art-9eb8c0e811e5446990be853fa877d0e82022-12-21T20:55:35ZengTechnical University of KosiceActa Montanistica Slovaca1335-17882001-12-0164293297Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulationkvarla JiøíSisol MartinGrohol MilanThe 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.http://actamont.tuke.sk/pdf/2001/n4/6skvarla.pdfStabilisation of colloidssilicasurfactant adsorptioncoagulation kinetics |
| spellingShingle | kvarla Jiøí Sisol Martin Grohol Milan Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation Acta Montanistica Slovaca Stabilisation of colloids silica surfactant adsorption coagulation kinetics |
| title | Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation |
| title_full | Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation |
| title_fullStr | Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation |
| title_full_unstemmed | Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation |
| title_short | Evaluation of the aggregation stability of colloidal silica in the presence of CTAB. Part 1: Kinetic parameters of coagulation |
| title_sort | evaluation of the aggregation stability of colloidal silica in the presence of ctab part 1 kinetic parameters of coagulation |
| topic | Stabilisation of colloids silica surfactant adsorption coagulation kinetics |
| url | http://actamont.tuke.sk/pdf/2001/n4/6skvarla.pdf |
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