Second virial coefficient at the critical point in a fluid of colloidal spheres plus depletants

R. Tuinier, Maartje S. Feenstra

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

Vliegenthart-Lekkerkerker (VL) criterion B2 = 6vc for second virial coefficient B2 at the critical (colloidal) gas-liquid point is considered for a mixture of spheres with volume vc plus depletants. For the onset of fluid-phase instability, the VL criterion holds for a wide range of shapes of direct attractive forces between hard-core spheres (Vliegenthart, G. A.; Lekkerkerker, H. N. W. J. Chem. Phys. 2000, 112, 5364). In the case of long-ranged attractions imposed indirectly via depletants, it is found that the VL relation fails. Instead, B2/vc at the critical point depends strongly on the sphere/depletant size ratio. By making the hard spheres sticky, we find that B2 moves gradually toward the VL criterion upon increasing the stickiness.

Original languageEnglish
Pages (from-to)13121-13124
Number of pages4
JournalLangmuir
Volume30
Issue number44
DOIs
Publication statusPublished - 11 Nov 2014
Externally publishedYes

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