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 |
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Publisher |
AMER SCIENTIFIC PUBLISHERS |
Book Title |
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ISSN |
1533-4880 |
EISSN |
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Conference Name |
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Bibtex ID |
ISI:000289176100053 |
Observations |
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