Abstract
Pressure effect on the structure of a 3-component micro-emulsion AOT/water/n-decane was investigated by means of small-angle neutron scattering. The measured pressure range was from 0.1 (1 atm) to 83.5 MPa. The present sample was at the composition of the molar ratio of [water]/[AOT]=40.8 and the volume fraction of both water and AOT against the whole volume 0.6. A phase transition from disordered microemulsion to ordered lamellar structure was observed at about 50 MPa through a coexisting region. The pressure dependence of the repeat distance and the correlation length in both high- and low-pressure phases was calculated from the scattering profiles by fitting to Teubner and Strey's formula and/or a single Gaussian. The low-pressure phase became more disordered with increasing pressure and then the phase transition to the ordered phase occurred.
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© 1997 Steinkopff Verlag
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Nagao, M., Seto, H., Komura, S., Takeda, T., Hikosaka, M. (1997). Pressure-induced phase transition from disordered microemulsion to lamellar structure in a water/AOT/n-decane system. In: Kawasaki, K., Lindman, B., Okabayashi, H. (eds) Formation and Dynamics of Self-Organized Structures in Surfactants and Polymer Solutions. Progress in Colloid & Polymer Science, vol 106. Steinkopff. https://doi.org/10.1007/BFb0111036
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DOI: https://doi.org/10.1007/BFb0111036
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Online ISBN: 978-3-7985-1659-5
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