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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/628

Title: From dispersed nanodiscs to thin films of layered organic material via reversible swelling
Authors: DUBOIS, M
CARRIÈRE, D
IYER, R
ARUNAGIRINATHAN, MA
BELLARE, JAYESH
VERBAVATZ, JM
ZEMB, TH
Keywords: crystallization
water absorption
scanning electron microscopy
transmission electron microscopy
Issue Date: 2008
Publisher: Elsevier
Citation: Colloids and Surfaces A: Physicochemical and Engineering Aspects 319(1-3), 90-97
Abstract: We show that nanodiscs stabilized with polymers order and pile up on a surface upon drying. The resulting surface films with an average thickness of one micron are made of collapsed cohesive layers with smectic long-range order. This occurs with and without plastifying stabilizing polymer and produces crevasses. The stacked discs undergo a two-to-three-dimensional crystallization while bottom layers close to the surface fuse and produce infinite bilayers. Small angle X-ray scattering experiments demonstrate that excess polymer is segregated from the crystalline stack. Water adsorption isotherms show that reversible swelling of the excess polymer does not destroy the compact stack of partially fused nanodiscs collapsed parallel to the surface. In the absence of chemical binding, the stacks of layered nanodiscs can be removed by simple washing with pure water. AFM, TEM and SEM experiments demonstrate that presence of crevasses is quenched by the presence of a plastifying polymer.
URI: http://dx.doi.org/10.1016/j.colsurfa.2007.05.051
http://hdl.handle.net/10054/628
http://dspace.library.iitb.ac.in/xmlui/handle/10054/628
ISSN: 0927-7757
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