Volume 53, Number 1, January 2001
|Page(s)||86 - 92|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2003|
Charge renormalization and phase separation in colloidal suspensions
Departamento de Física, Universidade Federal do Ceará
Caixa Postal 6030, CEP 60455-760, Fortaleza, CE, Brazil
2 Instituto de Física, Universidade Federal do Rio Grande do Sul Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS, Brazil
3 Departamento de Física, Universidade Federal do Rio Grande do Norte Caixa Postal 66318, CEP 59073-970, Natal, RN, Brazil
Accepted: 20 October 2000
We explore the effects of counterion condensation on fluid-fluid phase separation in charged colloidal suspensions. It is found that formation of double layers around the colloidal particles stabilizes suspensions against phase separation. Addition of salt, however, produces an instability which, in principle, can lead to a fluid-fluid separation. The instability, however, is so weak that it should be impossible to observe a fully equilibrated coexistence experimentally.
PACS: 82.70.Dd – Colloids / 83.20.Di – Microscopic (molecular) theories / 05.70.Ce – Thermodynamic functions and equations of state
© EDP Sciences, 2001
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