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Stimuli-sensitive materials can respond to physical forces with structural phase transitions. This also applies to biopolymer–surfactant mixtures, a study by German and Chinese scientists now reports. Surprisingly, the newly adopted phases persist after removal of the stress and can be detected by a simple optical read-out technology. Biometric fingerprint detection is an attractive application for this technology. The results are published in the journal Angewandte Chemie.
Liquid crystals are shape-anisotropic molecules that can adopt distinct ordered phases, depending on the physical conditions. Temperature, pressure, or charge can produce color shifts, dark–light switches, or a birefractive appearance, all of which represent changes in the molecular order. Such transitions can also occur in gels, and even in soaps with micellar transitions. The chemical system developed by Andreas Herrmann at the University of Groningen, the Netherlands, and colleagues at the Chinese Academy of Sciences, is a complex of a supercharged polypeptide with a cationic surfactant. The viscous liquid adopted birefringence patterns after simply being touched, to reveal details such as those of a fingerprint.
Behavior - Fluids - Scientists - Series - Polypeptides
Seeking to explore the behavior of biological fluids, the scientists designed a series of supercharged polypeptides that form biological soft materials with interesting properties when paired with molecules supplying the opposite charge. The supercharged polypeptides consisted of five amino acid repeating units with one or two negatively charged glutamic acid residues within each unit. As the cationic surfactant, the researchers designed an aromatic...
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