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利用兰州重离子加速器提供的25 MeV·u~(-1) ~(86)Kr~(26+)离子辐照厚度为12μm和25μm的聚对苯二甲酸乙二酯(Poly(ethylene terephthalate),PET)薄膜,注量分别为1×10~6 ions·cm~(-2)和5×107 ions·cm~(-2)。将辐照后的PET薄膜浸入5 mol·L~(-1)、60oC的NaOH溶液蚀刻,制得不同孔径的核孔膜样品。分析了测厚法、光学显微镜观察法和泡点法三种孔径测量法的优劣,实验对比结果表明,对于孔径小于1μm的纳米孔径核孔膜,适合利用泡点分析法测量有效截留孔径,测量误差小于5%;对于孔径大于3μm的微米孔径或直筒孔核孔膜,优先选择光学显微镜观察法测量表面孔径,测量误差小于10%。制备孔径为2μm和450 nm的核孔膜样品,用其进行黄河水过滤,探究过滤效果。进一步证明微米孔径核孔膜去除水样中一般颗粒物有明显效果(微粒数目平均减少99.12%),450 nm孔径或更小孔径的核孔膜可绝大部分清除水样中的细菌(微粒数目减少99.90%)。实验结果对今后核孔膜孔径的测量和定标及水质净化具有参考意义。
Poly (ethylene terephthalate) with thickness of 12μm and 25μm was irradiated by 25 MeV · u ~ (-1) ~ (86) Kr ~ (26+) ions provided by Lanzhou heavy ion accelerator, PET) film, the fluence was 1 × 10-6 ions · cm -2 and 5 × 107 ions · cm -2, respectively. The irradiated PET film was immersed in 5 mol·L ~ (-1) NaOH solution of 60 ° C for etching to prepare samples with different pore size. The advantages and disadvantages of three kinds of pore size measurement methods, such as thickness measurement, light microscope observation and bubble point method, were analyzed. The experimental results show that the bubble diameter analysis method is suitable for measuring the pore size of nano- The measurement error is less than 5%. For the micropore with a diameter of more than 3μm or the core-hole film of the straight-through hole, optical microscopy is the preferred method for measuring the surface aperture with a measurement error of less than 10%. Preparation of nuclear pore membrane pore size of 2μm and 450 nm sample, with its Yellow River water filtration, to explore the filtering effect. It is further proved that the micropore membrane has the obvious effect of removing common particles in water sample (the number of particles is reduced by an average of 99.12%). The nuclear membrane with the aperture of 450 nm or smaller can eliminate bacteria in water samples (the number of particles is reduced 99.90%). Experimental results for the future nuclear pore size measurement and calibration and water purification with reference.