Light scattering studies of the sol-to-gel transition in particulate systems

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:556

Article

Ebini, Raiya Husein¹  Sorensen, Christopher Michael¹ 

[1] Kansas State Univ, Dept Phys, Cardwell Hall, Manhattan, KS 66506 USA

关键词: Aggregation;    Gelation;    Light scattering;   

DOI  :  10.1016/j.jcis.2019.08.075

来源: Elsevier

【 摘 要 】

We present investigations of the kinetics of the colloidal sol-to-gel transition by combining small angle static light scattering (SASLS) and dynamic light scattering (DLS) techniques. Dilute monomer volume fractions were used to allow for a full investigation of the gelation to obtain all possible kinetic regimes. Our data verify the predictions of a kinetic theory, the ideal gel point (IGP) theory, where three regimes of kinetics are expected. We observe the first regime, the well-known cluster-dilute regime, with a kinetic exponent of z=1. Followed by a cluster-dense regime with an enhanced kinetics and z similar or equal to 2. Finally, a gelation regime is observed where the aggregate growth slows and ceases to grow at the IGP predicted size, R-g,R-G. These results quantitatively verify the IGP theory. We conclude that kinetic description provides a complete theory of the gelation process from sol to gel. (C) 2019 Elsevier Inc. All rights reserved.

【 授权许可】

Free