Formation of Organized Films with Fluorocarbon-Modified Inorganic Nanoparticles and Their Nanodispersion Behavior in Solvent
Formation of Organized Films with Fluorocarbon-Modified Inorganic Nanoparticles and Their Nanodispersion Behavior in Solvent
复制标题
氟碳改性无机纳米颗粒有序薄膜的形成及其在溶剂中的纳米分散行为
DOI：
10.1016/j.jfluchem.2019.109433
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
A. Fujimori
中科院分区：
文献类型：
--
作者：
H. Machida;T. Ohashi;S. Akasaka;A. Fujimori
研究了含有不同长度氟碳链的两亲化合物修饰的纳米金刚石在有机溶剂中的纳米分散行为。氟碳改性纳米金刚石具有优异的分散性能，特别是在非极性溶剂中。这种现象在碳氢化合物修饰的纳米颗粒中是看不到的。在有机溶剂中聚合粒径的减小更依赖于修饰链的长度而不是修饰速率。此外，系统地比较了这些有机修饰的纳米金刚石在水面上的行为。这些单颗粒层在水面上被证实依赖于压缩率。压缩速度越慢，形成的单颗粒层越均匀。此外，通过低速压缩，该系统具有适当的晶格间距和较高的正则性。在有机溶剂中的良好分散性与较长的松弛时间有关，以在水面上获得稳定的构象。也就是说，在有机溶剂中分散性较好的纳米粒子需要较长的弛豫时间才能在空气/水界面场中重排。
Nanodispersion behavior in organic solvents of nanodiamonds with surfaces modified by amphiphiles containing fluorocarbon chains of different lengths was investigated for future lubricant applications. Fluorocarbon-modified nanodiamonds exhibit excellent dispersion behavior, specifically in nonpolar solvents. This is a phenomenon that is not seen in hydrocarbon-modified nanoparticles. The reduction in the aggregated particle size in organic solvents is more dependent on the modified chain length than on the modification rate. In addition, the behaviors of these organo-modified nanodiamonds on a water surface were systematically compared. These single-particle layers on the water surface were confirmed to depend on the compression rate. The slower the compression speed, the more homogeneous the single-particle layer formed is. Further, proper lattice spacing and high regularity in this system were achieved by low-speed compression. Good dispersibility in organic solvents was related to a long relaxation time to achieve a stable conformation on the water surface. In other words, it was suggested that nanoparticles with better dispersibility in organic solvent require a longer relaxation time for rearrangement in the air/water interface field.