Heating-Induced Freezing and Melting Transitions in Charged Colloids

We examine influence of temperature on the phase behavior of dilute aqueous dispersions of charged colloidal silica and polystyrene particles. They undergo either freezing or melting transitions with increasing temperature. Freezing occurs in the case of low-charge, low-salt colloids, and melting is...

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Bibliographic Details
Published inLangmuir Vol. 27; no. 5; pp. 1569 - 1572
Main Authors Toyotama, Akiko, Yamanaka, Junpei
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 01.03.2011
Subjects
Chemistry
Colloids - chemistry
Exact sciences and technology
Freezing
General and physical chemistry
Hot Temperature
Polystyrenes - chemistry
Salts - chemistry
Silicon Dioxide - chemistry
Spectrum Analysis
Water
Particle
Binary compound
Transition temperature
Melting
Heating
Styrene polymer
Permittivity
Silica
Phase transitions
Colloid
Aqueous dispersion
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Summary:We examine influence of temperature on the phase behavior of dilute aqueous dispersions of charged colloidal silica and polystyrene particles. They undergo either freezing or melting transitions with increasing temperature. Freezing occurs in the case of low-charge, low-salt colloids, and melting is observed in the case of high-charge, high-salt colloids. All of these phase transitions are thermoreversible. These intriguing behaviors can be qualitatively explained in terms of the decrease in the permittivity of water at elevated temperatures.
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ISSN:0743-7463
1520-5827
DOI:10.1021/la104878r