Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (7): 825-835.DOI: 10.19894/j.issn.1000-0518.200328

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Study on [RESA]Br@-COOH@Fe3O4 with Density Functional Theory

NIU Zhan-Ning, TANG Hao-Qing, ZHENG Chao, TIAN Tian*, ZHENG Li-Yun   

  1. College of Materials Science and Engineering, Hebei University of Engineering, Handan 056000, China
  • Received:2020-11-02 Accepted:2021-02-24 Published:2021-07-01 Online:2021-09-01
  • About author:National Natural Science Foundation of China (No.51702081), the Natural Science Foundation of Hebeiprovince (Nos.B2020402002, B2019402020) and Hebei Provincial Education Committee Foundation (No.ZD2020126)

Abstract: [RESA]Br hydrophobic ionic liquids (ILs) were synthesized. The surface of -COOH@Fe3O4 nanoparticles was modified by [RESA]Br. The structures of [RESA]Br and [RESA]Br@-COOH@Fe3O4 were analyzed by 1H NMR spectroscopy and elemental analysis. The structures of [RESA]Br and [RESA]Br@-COOH@Fe3O4 have been optimized by Density Functional Theory (DFT) with B3LYP/6-311+G(d,p). The most stable configurations, interaction energies of ion pairs, dipole moment and electronic structure of [RESA]Br ILs are obtained. The mechanism of [RESA]Br ILs with straight haloalkane was discussed by DFT. The solubilities of [RESA]Br and [RESA]Br@-COOH@Fe3O4 in water, methanol, ethanol, acetone, acetonitrile and chloroform were measured at 298 K. The hydrophile-lipophile balance (HLB) values were obtained by using Radix Method and the hydrophobic properties were studied. They are insoluble in all of the solvents except for chloroform. Their HLB values are all small and they have good hydrophobic performance. [RESA]Br@-COOH@Fe3O4 nanoparticles coating on the NdFeB are dripped with a water droplet. The water droplet doesn't wet [RESA]Br@-COOH@Fe3O4 nanoparticles' protective layer with oleic acids cladding. It is still in the shape of water droplet. The angle between water droplets and the surface is within 90°~ 180°. The [RESA]Br@COOH@Fe3O4 nanoparticles′ protective layer has a good waterproof performance.

Key words: Hydrophobic ionic liquids, Surface modification of ferroferric oxide nanoparticles, Density functional theory, Solubility, Hydrophobic performance

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