Stability of cellulose lyotropic liquid crystal emulsions |
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Authors: | T Tixier M Heppenstall-Butler E M Terentjev |
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Institution: | (1) Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, UK;(2) Corporate Research, Unilever R&D, Colworth House, Sharnbrook, Bedford, MK44 1LQ, UK |
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Abstract: | We studied a new kind of W/O emulsions based on a
lyotropic liquid crystal as the aqueous droplet phase. The
cholesteric phase, a solution hydroxypropyl cellulose in water was
dispersed in the continuous oil matrix, paraffin oil or heptane.
We made a specific choice of surfactant in order to impose
director anchoring conditions at the oil-water interface and
orient the liquid crystal inside the droplet. The strong anchoring
conditions resulted in a topological defect inside the droplets of
size above the critical value R*. The defect elastic energy
creates a barrier against droplet coalescence, the effect of
topological size selection. We have studied the orientation of the
director inside the droplets and their size distribution. |
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Keywords: | |
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