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Gas Transport Properties of Ion-irradiated Membrane with Nano-channel

纳米通道离子辐照膜的气体传输性能

基本信息

批准号：
16310062
负责人：
NAGAOKA Shoji
金额：
$ 7.55万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16310062/
关键词：
Ion Irradiation Polyimide Nano-channel Gas Fermeability Gas Separation Membrane Ultrathin Membrane

项目摘要

In this research, the gas permeance and selectivity of the asymmetric polyimide membrane irradiated by ions were measured using a high vacuum apparatus with a Baratron absolute pressure gauge at 76cmHg and 35°C. The asymmetric polyimide membranes were prepared from a dry-wet phase inversion process, and the surface skin layer on the membrane was irradiated by ions in the fluence range from lx1012 to 3x1015(He+/cm2) at 50keV. We demonstrated that the gas selectivity of the He+-irradiated membrane increased with an increase in the ion fluence and that the depth profile of the energy loss for the irradiating ions in the skin layer had a significant influence on the gas permeability and selectivity of the asymmetric membrane.The gas permeances for the membrane showed an increase at a low ion fluence and a decrease at a high ion fluence. On the other hand, the gas selectivity increased with an increase in the ion fluence. One possibility may be that the gas permeation space, which can provide a high degree of size and shape discrimination between the gas molecules, was formed on the ion-irradiated skin surface and suppressed the permeability of N_2 and CH_4 rather than that of O_2 and CO_2. Another interesting conclusion is that the thickness of the ion-irradiated skin layer had a significant influence on the gas permeability and selectivity. The polyimide structure in the ion-irradiated surface layer would be closely correlated to the amount of ion energy loss so that the structure may determine the free volume and the free volume distribution formed in the membrane.It is desirable to prepare a polymer membrane with both a high gas permeability and selectivity for gas separation. The ion-irradiated asymmetric polyimide membrane prepared in this study showed interesting gas permeation results, and we consider that the ion irradiation would be one of the important membrane fabrication techniques for realizing a high gas permeability and selectivity.

在这项研究中，使用配备Baratron绝对压力计的高真空装置在76cmHg和35℃下测量了离子辐照的不对称聚酰亚胺膜的气体渗透性和选择性。采用干湿相转化工艺制备非对称聚酰亚胺膜，并在50keV下用注量范围为lx1012至3x1015(He+/cm2)的离子辐照膜的表层。我们证明，He+辐照膜的气体选择性随着离子注量的增加而增加，并且皮层中辐照离子的能量损失的深度分布对非对称膜的气体渗透性和选择性具有显着影响。膜的气体渗透性在低离子注量时表现出增加，在高离子注量时表现出下降。另一方面，气体选择性随着离子注量的增加而增加。一种可能性可能是，在离子照射的皮肤表面上形成了气体渗透空间，该气体渗透空间可以在气体分子之间提供高度的尺寸和形状区分，并抑制N_2和CH_4的渗透性，而不是O_2和CO_2的渗透性。另一个有趣的结论是，离子辐照表层的厚度对气体渗透性和选择性有显着影响。离子辐照表层中的聚酰亚胺结构与离子能量损失量密切相关，因此该结构可以决定膜中形成的自由体积和自由体积分布。需要制备一种既具有高气体渗透率又具有气体分离选择性的聚合物膜。本研究制备的离子辐照非对称聚酰亚胺膜显示出有趣的气体渗透结果，我们认为离子辐照将是实现高气体渗透性和选择性的重要膜制造技术之一。