苄基接枝海藻酸衍生物对TiO2纳米粒分散稳定性的影响

doi:10.13218/j.cnki.csdc.2018.06.008

Abstract

Abstract: Benzyl-grafted alginate derivative (BAD) was prepared by bimolecular nucleophilic substitution reaction (SN2) using benzyl bromide as a hydrophobic modifier.The effects of BAD on the dispersion stability of aqueous suspension of TiO₂ nanoparticles at different pH and ionic strength were investigated by dynamic light scattering.Additionally,the functional groups and morphology of BAD/TiO₂ nanoparticle composite were measured by fourier transform infrared spectroscopy and scanning electron microscopy.The experimental results show that the colloidal BAD is successfully synthesized by SN2 reaction.The average hydrodynamic size (d_H) of BAD micelles is 423.4 nm and the Zeta potential is-27.4 mV,which exhibits good colloidal properties.At different pH,the adsorption of BAD can enhance the chargeability of TiO₂ nanoparticles,which makes their Zeta potential to be lower than -30 mV and their d_H to be significantly lower than that of single TiO₂ nanoparticles.At different ionic strength,BAD can obviously weaken the electrostatic shielding effect of counterions on TiO₂ nanoparticles,which makes the agglomeration behavior of TiO₂ nanoparticles to be greatly reduced and their d_H to be significantly decreased.The molecular chain of BAD can not only enhance the electrostatic repulsion among TiO₂ particles,but also provide effective steric hindrance,which improves the dispersion stability of TiO₂ nanoparticles at different pH and ionic strength.The results of infrared spectroscopy and scanning electron microscopy indicate that the adsorption of BAD on TiO₂ nanoparticles is achieved mainly through the hydrogen bonding between BAD and TiO₂ nanoparticles,which has enhanced the steric hindrance among TiO₂ nanoparticles and thus makes them dispersed stably.

Key words: benzyl-grafted alginate derivative, TiO₂ nanoparticle, bimolecular nucleophilic substitution reaction, dynamic light scattering, dispersion stability

CLC Number:

O648.2+3

FENG Mei-xi, YAN Hui-qiong, CHEN Xiu-qiong, LIN Liang-quan, YANG Zheng, LIN Qiang. Effects of benzyl-grafted alginate derivative on the dispersion stability of TiO₂ nanoparticles[J].China Surfactant Detergent & Cosmetics, 2018, 48(6): 341-347.

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Effects of benzyl-grafted alginate derivative on the dispersion stability of TiO₂ nanoparticles

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Effects of benzyl-grafted alginate derivative on the dispersion stability of TiO₂ nanoparticles