Nanopatterning in Langmuir-Blodgett Monolayers of a Thermoresponsive Double Hydrophilic Block Copolymer Studied by Atomic Force Microscopy
Authors: Romão, Rute I. S.; Ferreira, Quirina; Morgado, Jorge; Martinho, José M. G.; Gonçalves da Silva, Amélia M. P. S.
Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 4, April 2011 , pp. 3151-3161(11)
Publisher: American Scientific Publishers
Abstract:The microphase-separation of Langmuir-Blodgett (LB) monolayers of a rhodamine B (RhB) end-labeled double hydrophilic block copolymer (DHBC), RhB-Poly(N,N-dimethylacrylamide)-b-poly(N,N-diethylacryl-amide) (RhB-PDMA207b-PDEA177) and the 1:1 segmental mixture of PDEA and RhB-PDMA homopolymers was followed by AFM. The DHBC LB films revealed a loose distribution of nano-aggregates with variable geometries below the lower critical solution temperature (LCST) of PDEA (32 °C) and low surface pressure (3 mN m−1). By increasing either the temperature above the LCST of PDEA or the surface pressure beyond the immersion regime of PDMA in the subphase (7 mN m−1) a dense nanopatterning was obtained. The absence of a corresponding regular nanopatterning in LB films of mixed homopolymers with the same composition highlights the role of the covalent bonding between PDEA and PDMA on the self-segregation of the two blocks at the air–water interface.
Document Type: Research Article
Publication date: April 1, 2011
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