ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
The phase behaviour and phase transition of the tetradecyldimethylaminoxide micellar system TDMAO/ D2O have been investigated by small-angle neutron scattering (SANS) at temperatures T between 287 and 325 K, pressures up to P = 842 MPa and at TDMAO concentrations of 55 and 102 mmol l−1. A pressure-induced structural (shape) phase transition was observed for the whole pressure versus temperature range, with a slope of the transition line of dTm/dP ∼ 0.31° MPa−1. The reversibility and reproducibility of this phase change were tested. The SANS experiments showed a pressure-induced structural phase transition from a low-pressure phase (i), where rod-like micelles with a radius of R = 1.94 ± 0.03 nm were present, to a high-pressure phase (ii). An accurate determination of the structure of phase (ii) has not been possible up to now. In phase (ii), a discrete correlation peak in the Q range 1.8–2.2 nm−1 was found.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889897002860
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