Journal article

Liquid crystalline period variations in self-assembled block copolypeptides-surfactant ionic complexes

  • Li, Chaoxu Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Li, Jingguo School of Materials Science and Engineering, Zhengzhou University, China
  • Zhang, Xiuqiang School of Materials Science and Engineering, Zhengzhou University, China
  • Zhang, Afang School of Materials Science and Engineering, Zhengzhou University, China
  • Mezzenga, Raffaele Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Nestlé Research Center, Lausanne, Switzerland
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    01.12.2009
Published in:
  • Macromolecular Rapid Communications. - 2010, vol. 31, no. 3, p. 265-269
English We investigate the complexation of ampholytic poly(N-isopropylacylamide)-block-poly- (L-glutamic acid)-block-poly(L-lysine) (PNiPAM-b-PLG-b-PLLys) triblock copolymers and PNiPAM-block-(PLG-co-PLLys) diblock copolymers with counter charged anionic and cationic surfactants. Both triblock and diblock copolymers are able to selectively form complexes through either L-glutamic acid-cationic surfactant or L-lysine-anionic surfactant ionic pairs, depending on the protonated or deprotonated states of the ampholytic peptide units. The complexes show ordering at multiple length scales: i) the block copolymer length scale (10¹ nm), ii) the liquid crystalline length scale (10⁰ nm), and, iii) the peptidic secondary structures length scale (10⁰ nm). We show that the liquid crystalline period can be tuned by varying the random/block copolypeptide architectures and the composition of the ampholytic amino acid species.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
License
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Persistent URL
https://folia.unifr.ch/unifr/documents/301372
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