CTAB辅助合成超高纵横比3Mg(OH)2·MgCl2·8H2O纳米线,New Journal of Chemistry

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CTAB辅助合成超高纵横比3Mg(OH)2·MgCl2·8H2O纳米线
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2023-03-15 , DOI: 10.1039/d2nj05624k
Lu Gong ₁ , Zhenying Yao ₁ , Chunmei Zhu ₁ , Lan Xiang ₂ , Xin Lian ₁ , Bai He ₁ , Baoyan Fan ₃ , Bo Yu ₁

Affiliation

在这项工作中，3Mg(OH) ₂ ·MgCl ₂ ·8H ₂首先通过液体法合成了具有超高纵横比的 O (318MHCH) 纳米线，并研究了十六烷基三甲基溴化铵 (CTAB) 在高浓度盐溶液中的作用。对合成的 318MHCH 纳米线的结构和形态进行了表征。所制备的318MHCH纳米线具有典型的三斜晶结构和较好的结晶性能。通过引入CTAB，318MHCH纳米线的纵横比将从500显着增加到4000。318MHCH纳米线的高纵横比是由于溶液粘度的增加和CTAB分子在晶体表面的选择性吸附。FTIR、Raman 和 XPS 光谱证实，CTAB 分子带正电的含氮头部与 318MHCH 晶体的表面相互作用。此外，由于 (-1 0 1) 平面具有较低的静电势，具有高电位的 CTAB 的含氮头更容易被吸附，这已通过分子动力学模拟得到证实。因此，CTAB被选择性地吸附在318MHCH纳米线的一侧，阻碍了横向生长，促进了318MHCH纳米线的纵横比。此外，其他阳离子表面活性剂已被证明对纳米线的选择性生长具有类似的影响。

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CTAB assisted synthesis of ultra-high aspect ratio 3Mg(OH)2·MgCl2·8H2O nanowires

In this work, 3Mg(OH)₂·MgCl₂·8H₂O (318MHCH) nanowires with ultra-high aspect ratios were first synthesized by a liquid method, and the effects of cetyltrimethylammonium bromide (CTAB) in highly concentrated salt solution were investigated. The structure and morphology of the synthesized 318MHCH nanowires were characterized. The as-prepared 318MHCH nanowires have a typical triclinic structure and relatively good crystallization properties. By introducing CTAB, the aspect ratio of 318MHCH nanowires will significantly increase from 500 to 4000. The high aspect ratio of 318MHCH nanowires is due to the increase in solution viscosity and the selective adsorption of CTAB molecules on the crystal surface. FTIR, Raman and XPS spectroscopy confirmed that the positively charged nitrogen-containing head of the CTAB molecule interacts with the surface of the 318MHCH crystal. Furthermore, since the (−1 0 1) plane has a lower electrostatic potential, the nitrogen-containing head of CTAB with a high potential is more readily adsorbed, which was confirmed by molecular dynamics simulations. Therefore, CTAB is selectively adsorbed on the side of 318MHCH nanowires, hindering the lateral growth and promoting the aspect ratio of 318MHCH nanowires. In addition, other cationic surfactants have been shown to have similar effects on the selective growth of nanowires.

更新日期：2023-03-15

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