Colloidal crystallites under external oscillation. Issue 24 (12th June 2020)

• Record Type: Journal Article
• Authors: Kakoty, Hreedish; Huang, Yunhu; Banerjee, Rajarshi; Dasgupta, Chandan; Ghosh, Ambarish
• Is Part Of: Soft matter. Volume 16:Issue 24(2020)
• Page Start: 5770
• Page End: 5776
• Publication Date: 2020-06-12
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c9sm02469g
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : We study the two-dimensional assemblies of interacting colloidal particles in a loosely focussed optical trap. Abstract : We study the two-dimensional assemblies of interacting colloidal particles in a loosely focussed optical trap. As the optical confinement is increased, the system becomes ordered and we investigate how these crystallites maintain their order under externally imposed oscillation. For small amplitudes, the crystalline order remains intact and the system behaves like a rigid body as predicted by numerical simulations. However, the rigidity breaks at large amplitudes, which we infer to be caused by the anharmonic component of the confinement potential. These studies are general enough to be applied to other physical systems comprising ordered finite-sized assemblies under external dynamic perturbation.