十六烷基三甲基溴化铵-珍珠粉相互作用及其稳定乳液的双重相转变

doi:10.3969/j.issn.1001-1803.2022.05.002

摘要/Abstract

摘要：

系统研究了阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）对生物质颗粒珍珠粉制备Pickering乳液的类型、微观结构的影响,同时解析了CTAB/珍珠粉稳定乳液从O/W型到W/O型再到O/W型的双重相转变现象。通过分散性观察、Zeta电位的测定、三相接触角和珍珠粉的荧光标记等手段深入剖析了CTAB与珍珠粉颗粒之间的相互影响。结果表明,在未添加CTAB和CTAB浓度较低时（0.01 mmol/L）时,珍珠粉能单独形成O/W型的Pickering乳液,乳化粒子为非球形且有一定聚结。当CTAB的浓度增加到0.05和0.20 mmol/L时,CTAB在珍珠粉表面吸附增强了颗粒的疏水性,润湿性的变化导致乳液类型从O/W型转变到W/O型,此时乳液的微观结构为球形,且尺寸分布较窄。随着CTAB浓度的进一步增加到0.90 mmol/L,CTAB在油水界面上取代吸附的珍珠粉颗粒,荧光显微镜观察验证了此时形成的O/W型乳液是由过量的CTAB来稳定。即通过简单地增加阳离子表面活性剂CTAB的浓度,就能实现乳液从O/W型到W/O型,再到O/W型的双重相转变。

关键词: 十六烷基三甲基溴化铵, 珍珠粉, 吸附, Pickering乳液, 双重相转变

Abstract:

The effect of cationic surfactant cetyltrimethyl ammonium bromide （CTAB） on the type and microstructure of Pickering emulsions prepared with biomass-based pearl powder were systematically studied. The double phase inversion from O/W type to W/O type and then to O/W type of emulsions stabilized by CTAB/pearl powder was analyzed. The interaction between CTAB and pearl powder particles was analyzed by dispersion observation, Zeta potential determination, the three-phase contact angles characterization and fluorescent labeling of pearl powder. The results show that pearl powder can stabilize O/W Pickering emulsions when CTAB is not added or the concentration of CTAB is low （0.01 mmol/L）, and the emulsion droplets are not spherical and have coalescence. When the concentration of CTAB increases to 0.05 mmol/L and 0.20 mmol/L, the adsorption of CTAB on the surface of pearl powder enhances the hydrophobicity of the particles, and the change of wettability leads to the phase inversion of the emulsion from O/W type to W/O type. At the same time, the microstructure of the emulsions is spherical and the size distribution is narrow. As the concentration of CTAB increases to 0.90 mmol/L, CTAB replaces the pearl powder particles at the oil-water interface. Fluorescence microscope observation verifies that the O/W emulsion formed is stabilized by excessive CTAB. That is, by simply increasing the concentration of CTAB, the emulsion can realize the double phase inversion from O/W type to W/O type, and then to O/W type.

Key words: cetyltrimethyl ammonium bromide, pearl powder, adsorption, Pickering emulsions, double phase inversion

中图分类号:

TQ423

张倩洁,沈兴亮,盛涛涛,张婉萍,许建营. 十六烷基三甲基溴化铵-珍珠粉相互作用及其稳定乳液的双重相转变[J]. 日用化学工业, 2022, 52(5): 468-475.

Zhang Qianjie,Shen Xingliang,Sheng Taotao,Zhang Wanping,Xu Jianying. The interaction of cetyltrimethyl ammonium bromide-pearl powder and its stabilization of the double phase inversion in emulsions[J]. China Surfactant Detergent & Cosmetics, 2022, 52(5): 468-475.

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