The Seebeck coefficient is determined from silicon microchannel plates （Si MCPs） prepared by photo- assisted electrochemical etching at room temperature （25 ℃）. The coefficient of the sample with a pore size of 5...The Seebeck coefficient is determined from silicon microchannel plates （Si MCPs） prepared by photo- assisted electrochemical etching at room temperature （25 ℃）. The coefficient of the sample with a pore size of 5 × 5μm^2, spacing of 1 μm and thickness of about 150 μm is -852μV/K along the edge of the square pore. After doping with boron and phosphorus, the Seebeck coefficient diminishes to 256 μV/K and -117 μV/K along the edge of the square pore, whereas the electrical resistivity values are 7.5 × 10^-3 Ω·cm and 1.9 × 10^-3 Ω·cm, respectively. Our data imply that the Seebeck coefficient of the Si MCPs is related to the electrical resistivity and is consistent with that of bulk silicon. Based on the boron and phosphorus doped samples, a simple device is fabricated to connect the two type Si MCPs to evaluate the Peltier effect. When a proper current passes through the device, the Peltier effect is evidently observed. Based on the experimental data and the theoretical calculation, the estimated intrinsic figure of merit ZT of the unicouple device and thermal conductivity of the Si MCPs are 0.007 and 50 W/（m.K）, respectively.展开更多
Objective: To understand the change of total red blood cells(RBCs) in a simulation of microcirculation during the myocardial ischaemia. Methods: The simulation system of capillary blood vessels by silicon microchannel...Objective: To understand the change of total red blood cells(RBCs) in a simulation of microcirculation during the myocardial ischaemia. Methods: The simulation system of capillary blood vessels by silicon microchannels was set up, and the deformability of total RBCs was measured in this system. Results: Compared with the control group, the filtration index(IF), filtration resistance(β) and block probability(ε) in the angina pectoris group increased significantly( P < 0.01 ). Moreover, the temporal parameters of a single cell passing through the microchannels(the time for entering the pore, the time for exiting the pore, the total passage time) also increased markedly. Conclusion: The results indicate that during the myocardial ischaemia, the stiffness and resistance of the RBCs increase, the movement velocity of the RBCs decrease, and the block probability of the RBCs increase in a simulation system of microcirculation.展开更多
基金Project supported by the Shanghai Fundamental Key Project(No.10JC1404600)the Shanghai Natural Science Foundation(No. 11ZR1411000)+3 种基金the Innovation Program of Shanghai Municipal Education Commission(No.09ZZ46)the International Collaboration Project(No.10520704400)the National Natural Science Foundation of China(Nos.60990312,61076060,61176108)the City University of Hong Kong Strategic Research Grant(SRG)(No.7008009).
文摘The Seebeck coefficient is determined from silicon microchannel plates （Si MCPs） prepared by photo- assisted electrochemical etching at room temperature （25 ℃）. The coefficient of the sample with a pore size of 5 × 5μm^2, spacing of 1 μm and thickness of about 150 μm is -852μV/K along the edge of the square pore. After doping with boron and phosphorus, the Seebeck coefficient diminishes to 256 μV/K and -117 μV/K along the edge of the square pore, whereas the electrical resistivity values are 7.5 × 10^-3 Ω·cm and 1.9 × 10^-3 Ω·cm, respectively. Our data imply that the Seebeck coefficient of the Si MCPs is related to the electrical resistivity and is consistent with that of bulk silicon. Based on the boron and phosphorus doped samples, a simple device is fabricated to connect the two type Si MCPs to evaluate the Peltier effect. When a proper current passes through the device, the Peltier effect is evidently observed. Based on the experimental data and the theoretical calculation, the estimated intrinsic figure of merit ZT of the unicouple device and thermal conductivity of the Si MCPs are 0.007 and 50 W/（m.K）, respectively.
文摘Objective: To understand the change of total red blood cells(RBCs) in a simulation of microcirculation during the myocardial ischaemia. Methods: The simulation system of capillary blood vessels by silicon microchannels was set up, and the deformability of total RBCs was measured in this system. Results: Compared with the control group, the filtration index(IF), filtration resistance(β) and block probability(ε) in the angina pectoris group increased significantly( P < 0.01 ). Moreover, the temporal parameters of a single cell passing through the microchannels(the time for entering the pore, the time for exiting the pore, the total passage time) also increased markedly. Conclusion: The results indicate that during the myocardial ischaemia, the stiffness and resistance of the RBCs increase, the movement velocity of the RBCs decrease, and the block probability of the RBCs increase in a simulation system of microcirculation.
