Use of HMDS/hexane double layers for obtaining low cost selective membrane
Use of HMDS/hexane double layers for obtaining low cost selective membrane
复制标题
使用HMDS/己烷双层获得低成本选择性膜
DOI：
10.1023/a:1024099329956
复制
发表时间：
2003
期刊：
影响因子：
5.7
通讯作者：
I. H. Tan
中科院分区：
文献类型：
--
作者：
M. L. D. da Silva;N. Demarquette;I. H. Tan
在低压等离子体反应器中，用双层HMDS（六甲基二矽氮烷）和正己烷涂覆过滤常用的纸张。所述有机化合物与所述衬底形成具有很好的附着力的薄膜；该工艺产生了拒水表面，其表观水接触角大于100°，吸水性约为15 g/m2。纸的孔隙度没有改变，表明沉积是保形的。初步研究了用改性纸作为选择性膜分离水和不同链长的有机极性和非极性化合物的可能性。测试的非极性化合物有：正己烷、环己烷、庚烷、十二烷、苯和聚二甲基硅氧烷。极性有机液体为乙醇、2-丙醇、四氯化碳、苯乙酮和苯酚。观察到三种类型的行为：(a)在水/非极性混合物的情况下，非极性化合物通过改性纸，而水没有；(b)在苯乙酮、苯酚和四氯化碳的情况下，水和极性化合物都没有通过改性纸渗透；(c)在水/2-丙醇或乙醇溶液的情况下，观察到，为了使酒精和水都能渗透到纸上，需要最低浓度的酒精；在这种情况下，酒精首先渗透，然后是水。
Sheets of paper commonly used for filtration were coated with double layers of HMDS (hexamethyl disilazane) and n-hexane using a low pressure plasma reactor. The organic compounds formed a thin film with very good adhesion to the substrate; the process produced water-repellent surfaces, with apparent water-contact angles higher than 100° and water adsorption around 15 g/m2. The paper porosity was not altered, indicating that the depositions were conformal. Preliminary tests to investigate the possibility of using the modified paper as a selective membrane for separation of water and organic-polar and non-polar compounds of different chain length were conducted. The non-polar compounds tested were: n-hexane, cyclohexane, heptane, dodecane, benzene and poly(dimethylsiloxane). The polar organic liquids were ethanol, 2-propanol, carbon tetrachloride, acetophenone and phenol. Three types of behaviour were observed: (a) in the case of water/non-polar mixture, the non-polar compound passed through the modified paper whereas water did not; (b) in the case of acetophenone, phenol and carbon tetrachloride, neither the water nor the polar compound percolated through the modified paper; (c) in the case of water/2-propanol or ethanol solution, it was observed that a minimum concentration of alcohol was necessary in order for both the alcohol and water to percolate through the paper; in this case the alcohol percolates first, followed by water.