Reversible emulsion and preparation method implementable multiple of pH value of the phase transition

The present invention relates to a reversible species emulsion and preparation method of pH value of the phase transition may be implemented a plurality of times. The reversible emulsion feed composed of: nano-silica nanoparticles or nano titanium oxide, N, N- (2-hydroxyethyl) amide, the oil and water phases. The present invention employs N, N- (2-hydroxyethyl) amide, and a stable emulsion of nanoparticles together, both the synergistic effect, increasing the stability of the emulsion. Regulation of the pH of the emulsion of the present invention is the reversible addition of an acid can be converted into O / W type, but also adding alkali into W / O type, such repeated operation, can achieve multiple phase transition, in the practical application of the improved emulsion the utilization rate.