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Biocatalytic Feedback-Controlled Non-Newtonian Fluids |
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| Authors: | Dr. Xiang Hao Kaixiang Yang Hairong Wang Prof. Feng Peng Prof. Haiyang Yang |
| Affiliation: | 1. Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083 China;2. CAS Key Laboratory of Soft Matter Chemistry, Chinese Academy of Science, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026 China;3. Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083 China Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, 100083 China |
| Abstract: | Non-Newtonian fluids are ubiquitous in daily life and industrial applications. Herein, we report an intelligent fluidic system integrating two distinct non-Newtonian rheological properties mediated by an autocatalytic enzyme reaction. Associative polyelectrolytes bearing a small amount of ionic and alkyl groups are engineered: by carefully balancing the charge density and the hydrophobic effect, the polymer solutions demonstrate a unique shear thickening property at low pH while shear thinning at high pH. The urea-urease clock reaction is utilized to program a feedback-induced pH change, leading to a strong upturn of the nonlinear viscoelastic properties. As long as the chemical fuel is supplied, two distinct non-Newtonian states can be achieved with a tunable lifetime span. As a proof of concept, we demonstrate how the physical energy-driven nonequilibrium properties can be manipulated by a chemical-fueled process. |
| Keywords: | Chemische Brennstoffe Nichtgleichgewichtsprozesse Nichtnewtonsche Flüssigkeiten Phasenumwandlungen Scherspannungsantwort |