Instability of a two-dimensional colloidal crystal at a water-air interface

Autor:	C B Rao, R. Kesavamoorthy, Baldev Raj
Rok vydání:	1993
Předmět:	Flocculation Microscope Materials science business.industry Air interface Colloidal crystal Condensed Matter Physics Instability law.invention chemistry.chemical_compound Colloid Optics chemistry law General Materials Science Polystyrene Thin film Composite material business
Zdroj:	Journal of Physics: Condensed Matter. 5:8805-8814
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/5/47/006
Popis:	The experimental observation of the sudden collapse of a two-dimensional colloidal crystal at a water-air interface is reported and explained here for the first time. A thin film of an aqueous suspension of polystyrene particles of 0.53 mu m diameter is confined between a smooth glass plate and an air bubble. A single layer of a 2D colloidal crystal is observed in this thin film using an optical reflection microscope equipped with a video camera and an image processor. On gradual draining of water from this thin film, particles forming a 2D colloidal crystal suddenly emerge to the water-air interface. At the interface they flocculate to form a compact 2D sheet of particles in which the particles touch each other, forming hexagonal and square 2D structures. This phenomenon is explained on the basis of the interfacial surface energies and the interparticle interaction potential at the water-air interface.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ed3a3750e3222c5fb1a1b978954e6786 https://doi.org/10.1088/0953-8984/5/47/006 Zobrazit plný text záznamu