Optimizing Shear-induced Alignment of 2D Colloids depending on Interparticle Interactions
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초록
내용
Graphene oxide (GO), a two-dimensional colloid, is renowned for its exceptional stability and dispersibility, and can form liquid crystalline phases. This study examines how shear-induced alignment in 2D colloidal dispersions can be enhanced by adjusting interparticle interactions with adding salts. By systematically changing NaCl concentrations, the research modulated the electrostatic repulsion among GO nanosheets, influencing their transition through various states such as jammed, repulsive glass, gel, and fluid. The structure and rheological properties of these states were analyzed using methods such as shear-polarized optical microscopy, rheo-small angle X-ray scattering, etc. The results revealed that alignment along the shear direction is most effective at the jamming threshold. These findings were also explained using theoretical models. The study further extended to creating fibers to test their mechanical and electrical properties.