TY - GEN
T1 - Slow dynamics of surfactant micelles in fluid and crystal phases
AU - Imai, M.
AU - Kurimoto, M.
AU - Matsuura, F.
AU - Sakuma, Y.
PY - 2013/3/12
Y1 - 2013/3/12
N2 - We have investigated diffusion of spherical surfactant micelles in fluid and crystal phases. The short-time and the long-time collective diffusions of spherical micelles were addressed by a neutron spin echo (NSE) and a dynamical light scattering (DLS) technique. In the fluid phase, the first-order virial coefficients of the normalized short-time collective diffusion coefficients agreed with those of the hard spheres, whereas the long-time collective diffusion coefficient exhibited the characteristic slowing down toward the fluid-HCP transition. At the fluid-HCP transition, the short-time diffusion coefficient increased abruptly, indicating increase of the effective free volume available for the micelles. Simultaneously, we observed a very slow mode characteristic of the crystal phases, suggesting hopping of micelles among the lattice sites.
AB - We have investigated diffusion of spherical surfactant micelles in fluid and crystal phases. The short-time and the long-time collective diffusions of spherical micelles were addressed by a neutron spin echo (NSE) and a dynamical light scattering (DLS) technique. In the fluid phase, the first-order virial coefficients of the normalized short-time collective diffusion coefficients agreed with those of the hard spheres, whereas the long-time collective diffusion coefficient exhibited the characteristic slowing down toward the fluid-HCP transition. At the fluid-HCP transition, the short-time diffusion coefficient increased abruptly, indicating increase of the effective free volume available for the micelles. Simultaneously, we observed a very slow mode characteristic of the crystal phases, suggesting hopping of micelles among the lattice sites.
KW - fluid-crystal transition
KW - long-time diffusion coefficient
KW - short-time diffusion coefficient
KW - surfactant micelles
UR - http://www.scopus.com/inward/record.url?scp=84874700487&partnerID=8YFLogxK
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U2 - 10.1063/1.4794675
DO - 10.1063/1.4794675
M3 - Conference contribution
AN - SCOPUS:84874700487
SN - 9780735411418
T3 - AIP Conference Proceedings
SP - 758
EP - 765
BT - 4th International Symposium on Slow Dynamics in Complex Systems
T2 - 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku
Y2 - 2 December 2012 through 7 December 2012
ER -