Probing Colloidal Particle Aggregation by Light Scattering
The present article reviews recent progress in the measurement of aggregation rates in colloidal suspensions by light scattering. Time-resolved light scattering offers the possibility to measure absolute aggregation rate constants for homoaggregation as well as heteroaggregation processes....
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | deu |
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Swiss Chemical Society
2013-11-01
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| Series: | CHIMIA |
| Subjects: | |
| Online Access: | https://www.chimia.ch/chimia/article/view/5464 |
| _version_ | 1819278392706465792 |
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| author | Gregor Trefalt Istvan Szilagyi Tamas Oncsik Amin Sadeghpour Michal Borkovec |
| author_facet | Gregor Trefalt Istvan Szilagyi Tamas Oncsik Amin Sadeghpour Michal Borkovec |
| author_sort | Gregor Trefalt |
| collection | DOAJ |
| description |
The present article reviews recent progress in the measurement of aggregation rates in colloidal suspensions by light scattering. Time-resolved light scattering offers the possibility to measure absolute aggregation rate constants for homoaggregation as well as heteroaggregation processes.
We further discuss the typical concentration dependencies of the aggregation rate constants on additives. Addition of simple salts containing monovalent counterions leads to screening of the electrostatic repulsion of the charged particles and a transition from slow to rapid aggregation. Addition
of salts containing multivalent counterions may lead to a charge reversal, which results in a sequence of two instability regions. Heteroaggregation rates between oppositely charged particles decrease with increasing salt level. This decrease is caused by screening of the electrostatic attraction between these particles.
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| first_indexed | 2024-12-24T00:11:17Z |
| format | Article |
| id | doaj.art-430814eea7364a769c19918792187327 |
| institution | Directory Open Access Journal |
| issn | 0009-4293 2673-2424 |
| language | deu |
| last_indexed | 2024-12-24T00:11:17Z |
| publishDate | 2013-11-01 |
| publisher | Swiss Chemical Society |
| record_format | Article |
| series | CHIMIA |
| spelling | doaj.art-430814eea7364a769c199187921873272022-12-21T17:24:53ZdeuSwiss Chemical SocietyCHIMIA0009-42932673-24242013-11-01671110.2533/chimia.2013.772Probing Colloidal Particle Aggregation by Light ScatteringGregor Trefalt0Istvan Szilagyi1Tamas Oncsik2Amin Sadeghpour3Michal Borkovec4Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, SwitzerlandDepartment of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, SwitzerlandDepartment of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, SwitzerlandDepartment of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, SwitzerlandDepartment of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland. michal.borkovec@unige.ch The present article reviews recent progress in the measurement of aggregation rates in colloidal suspensions by light scattering. Time-resolved light scattering offers the possibility to measure absolute aggregation rate constants for homoaggregation as well as heteroaggregation processes. We further discuss the typical concentration dependencies of the aggregation rate constants on additives. Addition of simple salts containing monovalent counterions leads to screening of the electrostatic repulsion of the charged particles and a transition from slow to rapid aggregation. Addition of salts containing multivalent counterions may lead to a charge reversal, which results in a sequence of two instability regions. Heteroaggregation rates between oppositely charged particles decrease with increasing salt level. This decrease is caused by screening of the electrostatic attraction between these particles. https://www.chimia.ch/chimia/article/view/5464CoagulationLatex particlesLight scatteringMultivalent ionsParticle aggregationSimple ions |
| spellingShingle | Gregor Trefalt Istvan Szilagyi Tamas Oncsik Amin Sadeghpour Michal Borkovec Probing Colloidal Particle Aggregation by Light Scattering CHIMIA Coagulation Latex particles Light scattering Multivalent ions Particle aggregation Simple ions |
| title | Probing Colloidal Particle Aggregation by Light Scattering |
| title_full | Probing Colloidal Particle Aggregation by Light Scattering |
| title_fullStr | Probing Colloidal Particle Aggregation by Light Scattering |
| title_full_unstemmed | Probing Colloidal Particle Aggregation by Light Scattering |
| title_short | Probing Colloidal Particle Aggregation by Light Scattering |
| title_sort | probing colloidal particle aggregation by light scattering |
| topic | Coagulation Latex particles Light scattering Multivalent ions Particle aggregation Simple ions |
| url | https://www.chimia.ch/chimia/article/view/5464 |
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