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China Surfactant Detergent & Cosmetics ›› 2022, Vol. 52 ›› Issue (5): 468-475.doi: 10.3969/j.issn.1001-1803.2022.05.002

• Basic research • Previous Articles     Next Articles

The interaction of cetyltrimethyl ammonium bromide-pearl powder and its stabilization of the double phase inversion in emulsions

Zhang Qianjie1,2,Shen Xingliang1,2,Sheng Taotao1,2,Zhang Wanping1,2,Xu Jianying1,2,*()   

  1. 1. School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China
    2. Collaborative Innovation Center of Fragrance Flavour and Cosmetics, Shanghai 201418, China
  • Received:2021-09-21 Revised:2022-04-28 Online:2022-05-22 Published:2022-05-24
  • Contact: Jianying Xu E-mail:soyjle_2000@163.com

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

CLC Number: 

  • TQ423