Genetically engineered supercharged polypeptide fluids: fast and persistent self-ordering induced by a touch.

Genetically engineered supercharged polypeptide fluids: fast and persistent self-ordering induced by a touch.
Angew Chem Int Ed Engl. 2018 Apr 16;:
Authors: Zhang L, Ma C, Sun J, Shao B, Portale G, Chen D, Liu K, Herrmann A
Abstract
Mechanically induced disorder-order transitions have been studied in fluid surfactant solutions or polymer thermotropic liquid crystals. However, the isothermally induced ordered phases do not persist after cessation of shear, which limits their technological applicability to a great extent. Moreover, no such stimuli-responsive materials involving biomacromolecules have been reported although biopolymer liquids are gaining a lot of attention. Here we introduce a new type of biological fluid system in which anionic polypeptides are complexed with cationic surfactants. The resulting fluids exhibited very sensitive isotropic-nematic transition triggered by shear. Surprisingly, the formed liquid crystal was preserved after cessation of mechanical stimulus. Self-ordering behavior of the material was achieved through water flow and finger pressing. The latter mechanical induction resulted in the formation of complex pattern that can be read out by birefringence allowing recording fingerprint information.
PMID: 29663645 [PubMed - as supplied by publisher]

Source: Angewandte Chemie - April 16, 2018 Category: Chemistry Authors: Zhang L, Ma C, Sun J, Shao B, Portale G, Chen D, Liu K, Herrmann A Tags: Angew Chem Int Ed Engl Source Type: research