油相组成对W/O型Pickering乳液稳定性和流变性能的影响

doi:10.3969/j.issn.2097-2806.2024.08.001

Abstract

Abstract:

Using dimethylsilylated silica as emulsifier, W/O Pickering emulsions were prepared by homogeneous emulsification. The kinds of oils, rheological modifiers and their effects on the stability and rheological properties of the W/O Pickering emulsions were studied. The results showed that, compared with the nonpolar oil, the W/O Pickering emulsion prepared with polar oil had smaller droplets and better stability, e.g., the emulsion prepared with jojoba oil had narrow particle size distribution, uniform shape and good stability. With the addition of rheological modifier, the particle size of the emulsion decreased to a certain extent, and the stability at room temperature and at low temperature was both slightly increased. For different oils, the rheological modifier which was similar to the oil in molecular structure had better effects in the reduction of particle size and the improvement of stability. All these W/O Pickering emulsions prepared with different oils were non-Newtonian fluids. With the increase of shear rate, the viscosity of the emulsions decreased, and the elastic modulus （G'） of all emulsions was higher than viscous modulus （G"）. All the emulsions were gel emulsions, and the linear viscoelastic region was 0.001%-0.100%. With the addition of rheological modifier, the viscosity of the emulsion increased and the shear thinning phenomenon was basically unchanged, but the linear viscoelastic region was enlarged, which might be related to the change of emulsion particle size and oil-water interfacial energy.

Key words: W/O Pickering emulsion, emulsion droplet size, stability, rheological property

CLC Number:

O648.2

Juyuan Zhang,Xiumei Tai,Huimin Liu,Xiaoyuan Ma,Xu Gao,Yi Luo. Effects of oil type on the stability and rheological properties of W/O Pickering emulsions[J].China Surfactant Detergent & Cosmetics, 2024, 54(8): 879-886.

Figures/Tables 9

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References 26

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配方编号	组分名称	w/%
A相	油脂	39
	鲸蜡基聚乙二醇/聚丙二醇-10/1二甲基硅氧烷	0.5
	聚甘油-2二聚羟基硬脂酸酯	0.5
	二甲基甲硅烷基化硅石	3
B相	水	52
B相	甘油	5

油脂种类	油-水-固体三相接触角/（°）
霍霍巴油	129.2±0.5
鲸蜡醇乙基己酸酯	130.1±0.3
异十六烷	142.7±0.4
15#白油	148.9±0.6
26#白油	153.0±0.5

	乳析指数/%
	霍霍巴油	鲸蜡醇乙基己酸酯	异十六烷	15#白油	26#白油
常温	10.8±0.2	13.6±0.1	9.7±0.2	14.8±0.3	14.7±0.2
高温	3.1±0.1	2.8±0.2	7.8±0.2	8.6±0.2	9.3±0.2
低温	14.3±0.3	22.3±0.4	13.7±0.3	3.3±0.1	11.2±0.3
离心	1.8±0.2	9.7±0.2	27.6±0.5	22.6±0.4	21.8±0.4

	乳析指数/%
	辛/癸酸甘油三酯·司拉氯铵水辉石·碳酸丙二醇酯	异十二烷·二硬脂锂蒙脱石· 柠檬酸三乙酯	矿油·二硬脂锂蒙脱石· 碳酸丙二醇酯
霍霍巴油	5.3±0.2	7.8±0.2	8.7±0.3
鲸蜡醇乙基己酸酯	4.1±0.2	10.7±0.3	11.6±0.4
异十六烷	8.1±0.1	4.3±0.1	7.8±0.3
26#白油	12.3±0.3	11.8±0.4	5.7±0.1
15#白油	11.9±0.2	10.2±0.3	4.9±0.2

Effects of oil type on the stability and rheological properties of W/O Pickering emulsions

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