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通过在金纳米通道阵列膜上修饰聚N-异丙基丙烯酰胺(PNIPAm)分子,发展了一种温度敏感的纳米通道阵列膜.以荧光素钠和水溶性量子点为探针,考察了这种膜在不同温度下的渗透性.结果表明,该PNIPAm分子修饰的膜能够可逆地响应外界温度的变化,使纳米通道的孔径大小被改变,进而影响膜的渗透性.当温度为25℃(<低临界溶液温度,LCST)时,荧光探针的渗透较慢,甚至基本上被阻止,这是因为PNIPAm分子呈现膨胀构象使通道尺寸变小所致;而当温度为40℃(>LCST)时,荧光探针的渗透明显加快,这是因为PNIPAm分子呈现紧缩构象使通道尺寸变大所致.这种温度敏感的金纳米通道阵列膜的渗透性可以被可逆地调控,有望用于纳米级阀门等装置.
A temperature-sensitive nanochannel array membrane was developed by modifying poly (N-isopropylacrylamide) molecules on gold nanochannel array membranes. With sodium fluorescein and water-soluble quantum dots as probes, The results showed that the PNIPAm-modified films could reversibly respond to changes in ambient temperature, resulting in changes in the pore size of the nanochannels, thereby affecting membrane permeability.When the temperature is 25 ° C LCST) , The penetration of the fluorescent probe is significantly accelerated because the PNIPAm molecules exhibit a constricted conformation resulting in a larger channel size.The permeability of this temperature sensitive gold nanochannel array membrane can be reversibly regulated and is expected to be used in nanoscale Valve and other devices.