Interaction Forces Between Simulated Mini Liquid Droplets of Emulsions†

doi:10.7503/cjcu20150455

Abstract

Abstract:

The interaction forces between liquid droplets were measured directly by reformed commercial DCAT21 tensiometer. The processes of approaching, squeezing and coalescence that occur between two liquid drops were observed and recorded by digital camera Digital 3.0. The experimental results indicate that the variation curves of interaction forces between mini droplets as a function of distance can provide the information of characteristic behavior of the dispersed droplets. The slopes of different stages of the curves can represent the magnitude of force and the squeezing distance before the coalescence can quantitatively reflect the stability of droplets. Different types of surfactants have different effects on hindering coalescence of two droplets and the nonionic surfactant TX-100 shows the better effect of stabilization. The coalescence of two droplets will be hindered by the layer structure formed by polymer molecules in thin liquid film. As a result, the force curves are step-shape.

Key words: Droplet, Coalescence, Drainage, Interaction force, Emulsion stability

CLC Number:

O647

TrendMD:

GUO Lanlei, LI Jing, ZHU Yangwen, MA Baodong, XU Zhicheng, WANG Wuning, ZHANG Lei, ZHANG Lu. Interaction Forces Between Simulated Mini Liquid Droplets of Emulsions^†[J]. Chem. J. Chinese Universities, 2016, 37(2): 361.

Figures/Tables 8

Fig.1 Force curves of water droplet in kerosene(A) and kerosene droplet in water(B)

Table 1 Slope values for the force curves of water/kerosene droplet in kerosene/water

No.	Water droplet in kerosene			Kerosene droplet in water
No.	Slope/(mg·mm^-1)	10⁶Deviation	S₁/(mg·mm^-1)	10⁵D₁	S₂/(mg·mm^-1)	10⁶D₂
1	-0.68	1.18	-13.14	1.7	-0.89	3.2
2	-0.81	1.64	-13.99	2.8	-0.97	3.9
3	-0.78	9.03	-13.27	2.7	-0.923	6.5
Ave.	-0.76	3.39	-13.47	2.4	-0.928	4.5

Fig.2 Schematic diagrams of wettability changes at the beginning stage

Fig.3 Force curves of water droplets in span-80/kerosene

Fig.4 Force curves of kerosene droplets in different solutions Solution:(A) pure water; (B) 1×10-4 mol/L SDBS; (C) 1×10-4 mol/L CTAB; (D) 1×10-4 mol/L TX-100.

Table 2 Slope values of different stages of the force curves of TX-100

Surfactant	S₁/(mg·mm^-1)	S₂/(mg·mm^-1)	S₃/(mg·mm^-1)	Squeezing Dis.
Water	-12.60	-0.84	—	0
SDBS	-11.07	-0.93	—	0
CTAB	-11.86	-0.76	-4.74	0.11
TX-100	-11.52	-0.87	-5.05	0.72

Fig.5 Force curves of kerosene droplets in 100 mg/L(A) and 500 mg/L(B) polymer solutions

Table 3 Slope values(S) of different stages in the force curve of polymer

Concentration/(mg·L^-1)	S₁/(mg·mm^-1)	S₂/(mg·mm^-1)	S₃/(mg·mm^-1)	S₄/(mg·mm^-1)
100	+0.04	-1.60	+0.42	-8.15
500	+0.16	-4.98	+0.43	-7.68

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