Ergodic-nonergodic phase diagram for a concentrated suspension of charge-stabilized colloids: Rescaled mean spherical approximation

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題名:	Ergodic-nonergodic phase diagram for a concentrated suspension of charge-stabilized colloids: Rescaled mean spherical approximation
作者:	Lai,SK;Wang,GF
貢獻者:	物理研究所
關鍵詞:	MODE-COUPLING THEORY;HIGHLY ASYMMETRIC ELECTROLYTES;IONIC MICELLAR SOLUTIONS;LIQUID-GLASS-TRANSITION;LENNARD-JONES SYSTEM;SUPERCOOLED LIQUIDS;BETA-RELAXATION;DENSITY-FLUCTUATIONS;STATIC CORRELATIONS;LIGHT-SCATTERING
日期:	1998
上傳時間:	2010-07-08 14:04:04 (UTC+8)
出版者:	中央大學
摘要:	We calculate the static structure factor of a concentrated suspension of charge-stabilized colloids using the mean spherical approximation, and apply the results obtained to determine its dynamical liquid-glass transition phase boundary within the idealized mode-coupling theory. It is found that the mean spherical approximation closure map yield an unphysical pair correlation function at the minimum distance of contact even at a high volume fraction (greater than or similar to 0.2) when the coupling strength of charged colloids has attained certain high values. In addition, we notice that the Debye-Huckel screening constant kappa defined parametrically in one component model generally differs from that defined in the primitive model. In other words, for a fixed macroion size, the kappa employed in one-component model calculation may be physically unrealistic. Therefore, we rescale the static structure factor and impose the charge neutrality condition to achieve a self-consistent kappa value for the one-component model and the primitive model. As a consequence, we are led to a reasonably reliable ergodic-nonergodic transition boundary that is applicable to charged colloids having different size and charge distribution. We confine our study to a monodisperse system and employ the effective screened Coulomb potential of Belloni [J. Chem. Phys. 85, 519 (1986)] and of Derjaguin-Landau-Verwey-Overbeek to describe in parallel the interactions between colloidal particles. Since the screened Coulomb potential can be modeled to describe a wide range of interactions and has a universal dynamical phase transition loci, our present analysis therefore provides a practical means for extensive studies of charged colloidal structures and, within the mode-coupling theory, of the dynamics of very high density colloids.
關聯:	PHYSICAL REVIEW E
顯示於類別:	[物理研究所] 期刊論文

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