Influence of screw dislocations on the orientation of a sheared lamellar phase
European Synchrotron Radiation Facility - F-38043
2 North Carolina State University, Physics Department Box 7518, Raleigh, NC 27695, USA
3 Centre de recherche Paul-Pascal, CNRS - Avenue du Dr-Schweitzer F-33600 Pessac, France
Accepted: 6 July 2001
We have investigated the role of screw dislocations defects in a lyotropic lamellar phase of the mixed DMPC//water system using microscopy and scattering techniques. Several of the usual shear-induced orientations of the lamellar phase were observed as a function of temperature and shear rate. It is suggested that the corresponding dynamical transitions are consistent with a variation in size of the defects.
PACS: 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures / 83.10.Tv – Structural and phase changes / 83.50.-v – Deformation and flow
© EDP Sciences, 2001