Takahashi Nobuyuki, Tamura Hiroaki, Mochizuki Dai, Kimura Tatsuo, Kuroda Kazuyuki
Department of Applied Chemistry, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo 169-8555, Japan.
Langmuir. 2007 Oct 9;23(21):10765-71. doi: 10.1021/la700974m. Epub 2007 Sep 12.
Poly(oxyethylene) alkyl ether (CnEOm) is intercalated into the interlayer space of a layered silicate kanemite by using layered hexadecyltrimethylammonium (C16TMA) intercalated kanemite (C16TMA-kanemite) as the intermediate. C16TMA-kanemite was treated with an aqueous solution of C16EO10, and the intercalation of C16EO10 was confirmed by the slight increase in the basal spacing (from 2.92 to 3.34 nm) with the increase in the carbon content, yielding C16EO10-C16TMA-kanemite. The product was dispersed again in a C16EO10 aqueous solution, and then 1.0 M HCl was added to the suspension to remove C16TMA ions completely. The basal spacing was further increased (from 3.34 to 5.52 nm) and the content of nitrogen was virtually zero, indicating further intercalation of C16EO10 molecules and complete elimination of C16TMA ions simultaneously. Though C16EO10 molecules are not directly intercalated into kanemite, the mutual interactions among C16TMA ions, C16EO10 molecules, and the interlayer silicate surfaces effectively induce the intercalation of C16EO10. C16EO10-kanemite shows a reversible adsorption of n-decane and water owing to the hydrophobicity and hydrophilicity of C16EO10, respectively, in the interlayer space. Layered CnEO10-kanemites (n = 12 and 18) were also synthesized in a manner similar to layered C16EO10-kanemite.
通过使用层状十六烷基三甲基铵（C16TMA）插层的片钠铝石（C16TMA-片钠铝石）作为中间体，将聚氧乙烯烷基醚（CnEOm）插入层状硅酸盐片钠铝石的层间空间。用C16EO10水溶液处理C16TMA-片钠铝石，随着碳含量的增加，层间距略有增加（从2.92nm增加到3.34nm），从而证实了C16EO10的插层，得到C16EO10-C16TMA-片钠铝石。将产物再次分散在C16EO10水溶液中，然后向悬浮液中加入1.0M HCl以完全除去C16TMA离子。层间距进一步增加（从3.34nm增加到5.52nm），氮含量几乎为零，这表明C16EO10分子进一步插层并同时完全消除了C16TMA离子。虽然C16EO10分子没有直接插入片钠铝石中，但C16TMA离子、C16EO10分子和层间硅酸盐表面之间的相互作用有效地诱导了C16EO10的插层。由于层间空间中C16EO10的疏水性和亲水性，C16EO10-片钠铝石对正癸烷和水表现出可逆吸附。层状CnEO10-片钠铝石（n = 12和18）也以类似于层状C16EO10-片钠铝石的方式合成。
