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A thorough study on the positive temperature coefficient (PTC) effects of conductive silicone rubber was made. Various conductive silicone rubbers with apparent differences in PTC anomalies (defined as the ratio of peak resistivity to room temperature resistivity) were chosen. The correlation between the size of the PTC anomaly and both the thermal expansion coefficient of conductive silicone rubber and the interaction between silicone rubber and carbon black (CB) were found. The effects of cross-linking on the temperature effect of resistivity of conductive silicone rubber were also studied. The results testify the important role of the interaction between silicone rubber and CBs in the temperature effect of resistivity of conductive silicone rubber.

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In this paper, a microfilter device with a series of pool and dam structures was designed and fabricated. To evaluate the efficiency of the filter, physical models were established to describe the behaviors of different kind of cells in the microfilter device. In our physical model, both the physical size effect and the deformability of cells are considered. As the deformability of a cell depends largely on its excess surface area index (ESI), the ESI of the tumor SPC-A-1 cells was measured and found to be as 61.7-81%.