Dynamics of confined depletion mixtures of polymers and bidispersed colloids

被引：13
|
作者：
Pandey, Rahul [1 ]
Conrad, Jacinta C. [1 ,2 ]
机构：
[1] Univ Houston, Dept Chem & Biomol Engn, Houston, TX 77204 USA
[2] Univ Houston, Petr Engn Program, Houston, TX 77204 USA
来源：
SOFT MATTER | 2013年 / 9卷 / 44期
关键词：
PHASE-BEHAVIOR; BINARY COLLOIDS; HARD-SPHERE; CHARGE; SUSPENSIONS; ATTRACTION; PARTICLES; GELATION; SYSTEMS; FILMS;
D O I：
10.1039/c3sm51879e
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We investigate the effect of confinement on solidification of mixtures of non-adsorbing polymers and bidispersed colloidal particles (size ratio aS/a(L) approximate to 0.49) in a low-dielectric-constant solvent. Holding the total volume fraction of particles fixed, the dynamics of the large particles become increasingly slow as either the volume fraction of small particles is increased or the confinement thickness is decreased. Confinement to ten large particle diameters induces gelation in all samples investigated, with the most arrested dynamics appearing when both the depletant concentration and volume fraction of small particles are large. The changes in dynamics are consistent with an increase in the effective interparticle attraction that is driven by changes in the electrostatic repulsion between particles as the suspension is confined, and thus are an indirect secondary effect of confinement.
引用
收藏
页码：10617 / 10626
页数：10
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