Publication Type Journal Article
Title Nanopatterning in Langmuir-Blodgett Monolayers of a Thermoresponsive Double Hydrophilic Block Copolymer Studied by Atomic Force Microscopy
Authors Rute I. S. Romao Quirina Ferreira Jorge Morgado J. M. G. Martinho Amélia Gonçalves da Silva
Groups MET
Journal JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Year 2011
Month April
Volume 11
Number 4
Pages 3151-3161
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-PDMA(207)b-PDEA(177)) 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 degrees C) and low surface pressure (3 mN m(-1)). By increasing either the temperature above the LOST 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.
DOI http://dx.doi.org/10.1166/jnn.2011.3726
ISBN
Publisher AMER SCIENTIFIC PUBLISHERS
Book Title
ISSN 1533-4880
EISSN
Conference Name
Bibtex ID ISI:000289176100053
Observations
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