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Swelling-induced long-range ordered structure formation in polyelectrolyte hydrogel

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Title: Swelling-induced long-range ordered structure formation in polyelectrolyte hydrogel
Authors: Arifuzzaman, Md. Browse this author
Wu, Zi Liang Browse this author
Kurokawa, Takayuki Browse this author →KAKEN DB
Kakugo, Akira Browse this author →KAKEN DB
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: Hydrogel
mechanical instability
semi-rigid polymer
polyion complexation
long-range ordered structure
Issue Date: 21-Aug-2012
Publisher: Royal Society of Chemistry
Journal Title: Soft Matter
Volume: 8
Issue: 31
Start Page: 8060
End Page: 8066
Publisher DOI: 10.1039/c2sm25814e
Abstract: A millimeter-scale periodic structure is created in a polyelectrolyte hydrogel by the rapid-heterogeneous swelling process, and is frozen by the polyion complexation of the polyelectrolyte network with the oppositely charged, semi-rigid polyelectrolyte. The hydrogel is synthesized from a cationic monomer, N-[3-(N,N-dimethylamino)propyl] acrylamide methyl chloride quaternary (DMAPAA-Q), in the presence of a small amount of the oppositely charged poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide) (PBDT) that has a semi-rigid nature. During swelling process, surface creasing due to the large mismatching of swelling degree between the surface layer and the inner one of the poly DMAPAA-Q (PDMAPAA-Q) gel occurs, which induces highly oriented semi-rigid PBDT molecules along the tensile direction of the crease pattern. In accompany with the evolution of surface creasing, a lattice-like periodic birefringence pattern is formed, which is frozen permanently by the strong polyion complex formation, even after the surface instability pattern of the gel disappears completely throughout the dynamic coalescence. In this work we rationally clarified that formation of such a long-range ordered non-equilibrium structure in the polyelectrolyte hydrogel by the rapid-heterogeneous swelling process requires the following three indispensable conditions: (i) swelling-induced surface creasing; (ii) polyion complex formation; and (iii) a semi-rigid or rigid dopant. This sort of non-equilibrium structure formation mechanism may help understand how biomacromolecules that are rigid polyelectrolytes, such as microtubules and actin filaments, form rich architectures during the growth of biological organs.
Rights: Soft Matter, 2012,8, 8060-8066 - Reproduced by permission of The Royal Society of Chemistry (RSC)
Type: article (author version)
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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