Surface hydrophobization of magnetite nanoparticles with polyhexylsilsesquioxane in diethylamine as reaction solvent
Surface hydrophobization of magnetite nanoparticles with polyhexylsilsesquioxane in diethylamine as reaction solvent
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二乙胺为反应溶剂中聚己基倍半硅氧烷对磁铁矿纳米粒子的表面疏水化
DOI：
10.1016/j.colsurfa.2016.08.041
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
K. Kurumada
中科院分区：
文献类型：
--
作者：
N. Yamauchi;K. Kurumada
提出了一种利用聚己基倍半硅氧烷对磁铁矿(Fe3O4)纳米粒子进行表面疏水的简便方法。聚己基倍半硅氧烷在磁性纳米粒子表面形成的疏水涂层是由己基硅醇部分溶解在二乙胺中自发生成的。由于Lewis的碱性，二乙胺可作为己基硅醇缩聚反应的催化剂。同时，二乙胺的相对低极性有利于保持聚己基倍半硅氧烷包覆的磁铁矿纳米粒子的分散性。此外，表面疏水涂层的存在有效地抑制了磁铁矿相向赤铁矿(α-Fe_2O_3)的转变，因为聚己基倍半硅氧烷涂层阻止了氧分子进入磁铁矿纳米颗粒的表面，这从聚己基倍半硅氧烷涂层中没有微孔得到了证明。
A facile method for surface hydrophobization of magnetite (Fe3O4) nanoparticles with polyhexylsilsesquioxane was proposed. The surface-hydrophobizing coating formed of polyhexylsilsesquioxane on the surface of the magnetite nanoparticles was spontaneously generated from hexylated silanol moiety dissolved in diethylamine. Due to the Lewis basicity, diethylamine worked as the catalyst for the polycondensation of the hexylated silanol. At the same time, the relatively low polarity of diethylamine was found favorable for maintaining the dispersibility of the polyhexylsilsesquioxane-coated magnetite nanoparticles. Moreover, the presence of the surface-hydrophobizing coating was effective for suppressing the transition of the magnetite phase to hematite (α-Fe2O3) even under highly oxidative condition since the polyhexylsilsesquioxane coating blocked oxygen molecules from the access to the surface of the magnetite nanoparticles as evidenced by the absence of micropores in the polyhexylsilsesquioxane coating layer.