Understanding the dynamics change across the Widom line in colloidal systems by studying the L64 micellar system
It has been a well-accepted concept that the difference between liquid and gas disappears beyond the critical point of a fluid. However, it has been recently found in water and Ar gas that there is still a line beyond the critical point across which the thermodynamic properties and dynamics of a fluid system may have very large change. This line is recently termed as the Widom line. In this proposal, we propose for the first time to study the change of the dynamic and structure properties across the Widom line in a colloidal system with a short-range attraction using both neutron spin echo and small angle neutron scattering. We have chosen to work on partially deuterated L64 block copolymers dissolved in D2O solvent. L64 forms spherical micelles in D2O solvent and is known to have a short range attraction close to its critical point. We will use neutron spin echo to investigate the change of dynamics (self-diffusion coefficient) across the Widom line by varying both concentration and temperature. Our synthesized partially deuterated L64 will have a protonated PPO core and a deuterated corona region so that we can focus on the study of the translational dynamics of the system.
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FALUS Peter; BAGLIONI Piero; BERTRAND Christopher; FRATINI Emiliano; LIU Yun and PORCAR Lionel. (2013). Understanding the dynamics change across the Widom line in colloidal systems by studying the L64 micellar system. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1277