Microscopic Observation of Nuclear Track Pores in Polymeric Membranes

Nuclear track pores were develop and observed in polycarbonate and LR-115 membranes. The polymer membranes were irradiated by swift heavy ions (SHI) and etched chemically. The stopping range of heavy ion is larger than the thickness of the membrane. The fluence of ions was changes from 103 to 107 ions-cm-2. The etching time was increased till pore size reaches up to micron range. The etching conditions were set to develop the porous tracks. The tracks are revealed under optical microscope as the size reaches up to micron or sub-micron size. The size was measured using standard electron diffraction grid. Results show that the porous tracks having average size of 2.4 micron can be developed in polycarbonate, while 5 - 10 micron porous tracks can be developed in LR-115.

核微孔滤膜的制备及其应用

核微孔滤膜是利用重离子辐照高分子材料后，经化学蚀刻而制成它具有真实的孔径和高选择过滤性能，因而得到广泛地应用讨论了核微孔滤膜的制备原理、方法。

PET薄膜中32S离子径迹的热退火效应

采用径迹蚀刻的方法研究了热处理对聚对苯二甲酸乙二醇酯(PET)薄膜中重离子径迹的热退火效应。使用113.7MeV的32S离子在PET薄膜中产生垂直于表面且贯穿薄膜的离子径迹。对薄膜进行局部热处理,加热温度为70~240℃,时间为1~300s。薄膜经过化学蚀刻成核孔膜后使用显微镜观测。结果表明:在相同的热处理时间下,随着热处理温度的升高,PET薄膜中离子径迹的热退火效应愈加明显;在热处理温度不变的情况下,随着热处理时间的增加,退火效应亦愈加明显。

聚合物离子径迹化学蚀刻过程的数值分析

介绍了聚合物材料离子径迹化学蚀刻过程的电导监测技术及相应的数据分析方法,针对理论假设与实际蚀刻过程不符的情况,详细考虑了径迹穿孔时间分布、孔形以及微孔中蚀刻液电导率随蚀刻时间变化等因素,建立了相应的径迹蚀刻模型,并通过数值计算研究了各种因素对径迹蚀刻过程中电导测量结果的影响,获得了有关离子径迹微观结构、微孔中蚀刻液电导率随孔径的变化以及径迹蚀刻速率比对孔形影响的信息。