Low-temperature energy harvest,delivery,and utilization pose significant challenges for thermal management in extreme environments owing to heat loss during transport and difficulty in temperature control.Herein,we pr...Low-temperature energy harvest,delivery,and utilization pose significant challenges for thermal management in extreme environments owing to heat loss during transport and difficulty in temperature control.Herein,we propose a light-driven photo-energy delivery device with a series of photo-responsive alkoxy-grafted azobenzene-based phase-change materials(a-g-Azo PCMs).These a-g-Azo PCMs store and release crystallization and isomerization enthalpies,reaching a high energy density of 380.76 J/g even at a low temperature of-63.92℃.On this basis,we fabricate a novel three-branch light-driven microfluidic control device for distributed energy recycling that achieves light absorption,energy storage,controlled movement,and selective release cyclically over a wide range of temperatures.The a-g-Azo PCMs move remote-controllably in the microfluidic device at an average velocity of 0.11-0.53 cm/s owing to the asymmetric thermal expansion effect controlled by the temperature difference.During movement,the optically triggered heat release of a-g-Azo PCMs achieves a temperature difference of 6.6℃ even at a low temperature of-40℃.These results provide a new technology for energy harvest,delivery,and utilization in low-temperature environments via a remote manipulator.展开更多
A pressure force control system for hot embossing of microfluidic chips is designed with a moment motor and a ball bearing lead screw. Based on the numeric PID technique, the algorithm of pulsant integral accelerated ...A pressure force control system for hot embossing of microfluidic chips is designed with a moment motor and a ball bearing lead screw. Based on the numeric PID technique, the algorithm of pulsant integral accelerated PID control is presented and the negative effects of nonlinearity from friction, clearance and saturation are eliminated. In order to improve the quick-resixmse characteristic, independent thread technique is adopted. The method of pressure force control based on pulsant integral accelerated PID control and independent thread technique is applied with satisfactory control performance.展开更多
基金Science Foundation for Distinguished Young Scholars in Tianjin,Grant/Award Number:19JCJQJC61700National Natural Science Foundation of China,Grant/Award Numbers:52327802,52173078,51973152+1 种基金National Key R&D Program of China,Grant/Award Number:2022YFB3805702State Key Program of National Natural Science Foundation of China,Grant/Award Number:52130303。
文摘Low-temperature energy harvest,delivery,and utilization pose significant challenges for thermal management in extreme environments owing to heat loss during transport and difficulty in temperature control.Herein,we propose a light-driven photo-energy delivery device with a series of photo-responsive alkoxy-grafted azobenzene-based phase-change materials(a-g-Azo PCMs).These a-g-Azo PCMs store and release crystallization and isomerization enthalpies,reaching a high energy density of 380.76 J/g even at a low temperature of-63.92℃.On this basis,we fabricate a novel three-branch light-driven microfluidic control device for distributed energy recycling that achieves light absorption,energy storage,controlled movement,and selective release cyclically over a wide range of temperatures.The a-g-Azo PCMs move remote-controllably in the microfluidic device at an average velocity of 0.11-0.53 cm/s owing to the asymmetric thermal expansion effect controlled by the temperature difference.During movement,the optically triggered heat release of a-g-Azo PCMs achieves a temperature difference of 6.6℃ even at a low temperature of-40℃.These results provide a new technology for energy harvest,delivery,and utilization in low-temperature environments via a remote manipulator.
基金This project is supported by National Hi-tech Research and Development Program of China (863 Program, No. 2004AA404260).
文摘A pressure force control system for hot embossing of microfluidic chips is designed with a moment motor and a ball bearing lead screw. Based on the numeric PID technique, the algorithm of pulsant integral accelerated PID control is presented and the negative effects of nonlinearity from friction, clearance and saturation are eliminated. In order to improve the quick-resixmse characteristic, independent thread technique is adopted. The method of pressure force control based on pulsant integral accelerated PID control and independent thread technique is applied with satisfactory control performance.
