Reversible Cluster Aggregation and Growth Model for Graphene Suspensions

Citation:

Alifierakis, M. ; Sallah, K. S. ; Aksay, I. A. ; Prevost, J. H. Reversible Cluster Aggregation and Growth Model for Graphene Suspensions. AIChE Journal 2017, 63, 5462-5473.

Date Published:

Dec

Type of Article:

Article

ISBN Number:

0001-1541

Accession Number:

WOS:000414348500021

Abstract:

We present a reversible cluster aggregation model for 2-D macromolecules represented by line segments in 2-D; and, we use it to describe the aggregation process of functionalized graphene particles in an aqueous SDS surfactant solution. The model produces clusters with similar sizes and structures as a function of SDS concentration in agreement with experiments and predicts the existence of a critical surfactant concentration (C-crit) beyond which thermodynamically stable graphene suspensions form. Around C-crit, particles form dense clusters rapidly and sediment. At C << C-crit, a contiguous ramified network of graphene gel forms which also densifies, but at a slower rate, and sediments with time. The deaggregation-reaggregation mechanism of our model captures the restructuring of the large aggregates towards a graphite-like structure for the low SDS concentrations. (C) 2017 American Institute of Chemical Engineers

Short Title:

Aiche J.Aiche J.