Diode-like single-ion track membrane prepared by electro-stopping
Diode-like single-ion track membrane prepared by electro-stopping
复制标题
DOI：
10.1016/s0168-583x(01)00722-4
复制
发表时间：
2001-11-01
影响因子：
1.3
通讯作者：
Yoshida, M
中科院分区：
文献类型：
--
作者：
Apel, PY;Korchev, YE;Yoshida, M
介绍了采用化学和电停止相结合的方法在聚对苯二甲酸乙酯（PET）中制备不对称膜的方法。为此，将单离子辐照的PET膜插入电解槽中，在9 M氢氧化钠中从一侧蚀刻，同时将另一侧浸泡在2 M KCl和2 M HCOOH（体积比1:1）的混合物中，在孔突破时从蚀刻坑尖端电缩回OH-离子。当达到预设电流时，用酸性的1m氯化钾溶液代替蚀刻溶液，从而中断蚀刻过程。蚀刻完成后，在对称洗浴条件下，将膜的两侧浸泡在相同浓度（0.01-1 M）和pH（3-8）的KCI溶液中，测定其电流-电压（I-V）特性。I-V特性是强烈非线性的，可与电子二极管相媲美。如果在蚀刻过程中极性相反，将OH-离子推向蚀刻坑的尖端，则产生的孔更大，不对称程度更小。比较了电停与化学停的重要性。(C) 2001 Elsevier Science B.V.版权所有
The preparation of an asymmetric membrane in poly(ethylene terephthalate) (PET) is described, using a combination of chemical and electro-stopping. For this purpose, a single-ion-irradiated PET film is inserted into an electrolytic cell and etched from one side in 9 M sodium hydroxide while bathing the other side in a mixture of 2 M KCl and 2 M HCOOH (1:1 by volume), electrically retracting the OH- ions from the tip of the etch pit during pore breakthrough. When a preset current has been reached, the etch process is interrupted by replacing the etching solution with acidic 1 M potassium chloride solution. After etching, the current-voltage (I-V) characteristic is determined under symmetric bathing conditions, immersing both sides of the membrane in KCI solutions of identical concentration (0.01-1 M) and pH (3-8). The I-V characteristic is strongly non-linear, comparable to that of an electrical diode. If the polarity during etching is reversed, pushing the OH- ions into the tip of the etch pit, the resulting pores are larger and the degree of asymmetry smaller. The importance of electro-stopping is compared with chemical stopping. (C) 2001 Elsevier Science B.V. All rights reserved.