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Separation of DMMP/water vapor with PDMS/silica membranes for the sample inlet of ion mobility spectrometers

机译:用PDMS /二氧化硅膜的DMMP /水蒸气分离离子迁移光谱仪的样品入口

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In order to obtain an ideal sample inlet membrane for ion mobility spectrometers (IMS), fumed silica was modified using hexamethyldisilazane and was incorporated into the matrix of polydimethylsiloxane (PDMS) silicone rubber to fabricate PDMS/silica mixed matrix membranes with different thickness. Dimethyl methylphosphonate (DMMP) permeability of thin silicone rubber membranes (SRM) with the least thickness of approximate 5μm was studied. DMMP concentration interior to the SRM showed the linear correlation to that external to the SRM. Thickness and temperature of SRM were two important factors influencing the permeation proportion of DMMP. Most water vapor was prevented to transfer through the SRM. In addition, the SRM had a good selectivity of DMMP/water vapor and the maximum separation factor was 4.82 when the temperature of membranes reached 80°C.
机译:为了获得用于离子迁移光谱仪(IMS)的理想的样品入口膜,使用六甲基二硅氮烷改性气相二氧化硅,并掺入聚二甲基硅氧烷(PDMS)硅橡胶基质中以制造具有不同厚度的PDMS /二氧化硅混合基质膜。 研究了具有最小厚度5μm的薄硅橡胶膜(SRM)的二甲基甲基膦酸盐(DMMP)渗透性。 DMMP浓度内部对SRM显示与SRM外部外部的线性相关性。 SRM的厚度和温度是影响DMMP渗透比例的两个重要因素。 预防大多数水蒸气通过SRM转移。 此外,当膜的温度达到80℃时,SRM对DMMP /水蒸气的选择性良好,最大分离因子为4.82。

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