A hydrogel-actuated environmentally sensitive microvalve for active flow control
A hydrogel-actuated environmentally sensitive microvalve for active flow control
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DOI：
10.1109/jmems.2003.818070
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发表时间：
2003-10-01
影响因子：
2.7
通讯作者：
Ziaie, B
中科院分区：
文献类型：
--
作者：
Baldi, A;Gu, YD;Ziaie, B
本文报道了一种水凝胶致动微阀的制造和测试，该微阀响应于外部液体环境中特定化学物质浓度的变化。微阀由薄水凝胶组成，夹在刚性多孔膜和柔性硅橡胶隔膜之间。水凝胶的溶胀和去溶胀（其由化学物质通过多孔膜的扩散引起）伴随着隔膜的偏转，并因此伴随着阀进气口的关闭和打开。基于苯基硼酸的水凝胶用于构建智能微阀，其响应于葡萄糖和pH浓度的变化。使用30 μ m厚的水凝胶和60 μ m厚的0.1 μ m多孔膜实现的最快响应时间（对于pH浓度循环）为7分钟。孔径和40%的孔隙率。
This paper reports on the fabrication and test of a hydrogel-actuated microvalve that responds to changes in the concentration of specific chemical species in an external liquid environment. The microvalve consists of a thin hydrogel, sandwiched between a stiff porous membrane and a flexible silicone rubber diaphragm. Swelling and deswelling of the hydrogel, which results from the diffusion of chemical species through the porous membrane is accompanied by the deflection of the diaphragm and hence closure and opening of the valve intake orifice. A phenylboronic-acid-based hydrogel was used to construct a smart microvalve that responds to the changes in the glucose and pH concentrations. The fastest response time (for a pH concentration cycle) achieved was 7 min using a 30-mum-thick hydrogel and a 60-mum-thick porous membrane with 0.1 mum. pore size and 40% porosity.