摘要
一個不需要任何外加動力且操作手續簡單的的被動式生醫晶片一直是微機電領域努力研究的重點產品，但是目前在控制樣本在檢測區反應的停留時間，還是避免不了需要一個外加動力源來操作微動閥門並控制流體的運行。
因此，為了實現完全無外加動力源的被動式的生醫晶片，一個可以自發性控制時間的被動式閥門元件是一項必要的發展，也是一樣艱鉅的挑戰，在此，我們利用彈性體材料PDMS製作出被動式閥門並利用幾何結構來自動停止流體，並利用水膠吸水膨脹的特性形成一個丁字型微制動器來造成閥門結構的形變，藉此自動開啟閥門，讓流體再度流動。
在此選用的水膠材料為Poly(ethylene glycol) diacrylate (PEGDA) ，為一高含水量的光聚合型水膠，固化後的吸水膨脹量為50%左右，製作於在流道中的吸水膨脹伸長速率為10~30um/min，原本寬度為40um的閥門口，經過丁字型水膠微制動器的驅動後，其寬度會拓寬至55um，經過這樣的形變可以使得其被動式閥門從關閉的狀態轉變成開啟的狀態，一個水膠被動式時序控制閥門可以延遲流體時間從0.1秒延長到一分半左右。

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