Microscopic dynamics of nanoparticle monolayers at air-water interface

Bhattacharya, R and Basu, JK (2013) Microscopic dynamics of nanoparticle monolayers at air-water interface. In: JOURNAL OF COLLOID AND INTERFACE SCIENCE, 396 . pp. 69-74.

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Abstract

We present results of surface mechanical and particle tracking measurements of nanoparticles trapped at the air-water interface as a function of their areal density. We monitor both the surface pressure (II) and isothermal compression modulus (epsilon) as well as the dynamics of nanoparticle clusters, using fluorescence confocal microscopy while they are compressed to very high density near the two dimensional close packing density Phi similar to 0.82. We observe non-monotonic variation in both epsilon and the dynamic heterogeneity, characterized by the dynamical susceptibility chi(4) with Phi, in such high density monolayers. We provide insight into the underlying nature of such transitions in close packed high density nanoparticle monolayers in terms of the morphology and flexibility of these soft colloidal particles.. We discuss the significance our results in the context of related studies on two dimensional granular or colloidal systems. (C) 2013 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF COLLOID AND INTERFACE SCIENCE
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Additional Information:	Copyright for this article belongs to the ACADEMIC PRESS INC ELSEVIER SCIENCE, USA.
Keywords:	Nanoparticle at interface; Langmuir monolayer; Interfacial rheology; Particle tracking; Jamming transition; Dynamical heterogeneity
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	20 May 2013 07:02
Last Modified:	20 May 2013 07:02
URI:	http://eprints.iisc.ac.in/id/eprint/46481

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