The phase inversion mechanism of the pH-sensitive reversible invert emulsion from w/o to o/w
| Autor: | Chunyu Xing, Zhaoxiang Zhang, Yanling Wang, Yanping Xin, Hong Jiang, Xiaqing Li, Gao Liang, Xiaodong Dai, Fei Liu, Kun Liu, Zhihua Liu, Xuewu Wang, Dehui Du |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Physics QC1-999 microstructure General Physics and Astronomy Thermodynamics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences phase inversion 0104 chemical sciences ph-responsive Emulsion 0210 nano-technology Phase inversion Mechanism (sociology) |
| Zdroj: | Open Physics, Vol 18, Iss 1, Pp 380-390 (2020) |
| ISSN: | 2391-5471 |
| Popis: | Alteration in the environmental conditions will cause a reversed reaction between o/w emulsion and w/o emulsion that has similar advantages of different liquids form on the reversible invert emulsion. The reversible phase inversion of the emulsion has a benefit of dealing with drilling cutting, so the reversible invert emulsion also can be thought used as a drilling fluid. The phase inversion from w/o emulsion to o/w emulsion can be divided into three stages. They are w/o emulsion, w/o/w emulsion, and o/w emulsion. In the w/o emulsion stage, the structure appeared among water droplets when the percentage of the HCl solution (5%) was less than 0.375%. In the w/o/w emulsion stage, the structure among water droplets existed at the beginning of this stage; however, the internal phase and the external phase can interchange their positions during the process. In the third stage, the structures among droplets of the emulsion would be broken and the degree of the dispersion of the oil droplet in the emulsion would increase. The changes in the microstructure, conductivity, electrical stability, standing stability, and the viscosity of the emulsion, which have edified among droplets in the process from w/o emulsion to o/w emulsion, were studied. The result of the microstructure microscopic observation agrees with the result of the electrical stability and viscosity experiments. Moreover, the internal phase and the external phase can interchange positions during the process. |
| Databáze: | OpenAIRE |
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