Wang, Zhiyuan and Guo, Hongyu and Borner, Katherine and Liu, Yun (2016) Irreversible aggregation of silica colloidal particles in binary solvent of 2,6-lutidine and water. Il nuovo cimento C, 39 (3). pp. 1-12. ISSN 1826-9885
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Abstract
Small silica colloidal particles suspended in a binary solvent, such as water and 2,6-lutidine, have attracted increasing attention in the past several decades as model systems to study critical adsorption, critical Casimir force, and colloidal glass transitions because the preferential solvent adsorption and the effective interaction between these colloidal particles can be tuned by controlling the temperature and solvent concentrations. In these early studies, the aggregation or clustering of particles driven by the solvent fluctuation is believed to be stable and thermally reversible. However, we demonstrate here conclusively that irreversible aggregates and gels can occur for silica nanoparticles in the binary solvent 2,6-lutidine and water when either the lutidine concentration or particle volume fraction is high enough. Hence, the interpretation of the experiment results needs to be taken into consideration when using such systems as model thermally reversible colloidal systems.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 29 Sep 2020 16:21 |
| Last Modified: | 29 Sep 2020 16:21 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/19307 |
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