Loosely packed monolayer coffee stains in dried drops of soft colloids. Issue 47 (24th November 2017)

• Record Type: Journal Article
• Authors: Mayarani, M.; Basavaraj, Madivala G.; Satapathy, Dillip K.
• Is Part Of: Nanoscale. Volume 9:Issue 47(2017)
• Page Start: 18798
• Page End: 18803
• Publication Date: 2017-11-24
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr06732a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Evolution of order in soft colloidal monolayers produced by evaporative self assembly. Abstract : We report a complete suppression of the coffee-ring effect resulting in the formation of loosely packed two-dimensional particle monolayers by controlled evaporation of sessile drops containing soft microgel particles. These particulate deposits show gradual order-to-disorder transitions that are not abrupt like deposits of hard colloids. The areal coverage of the monolayer deposits can also be precisely controlled by tuning the particle concentration. The preferential adsorption of soft-microgel particles to the water–vapor interface, and their radial flow along the interface towards the drop edge facilitates the creation of the novel monolayer deposits.