Journal of Chemical Physics, Vol.100, No.11, 8315-8320, 1994
Local-Structure of Microemulsion
Correlation function between surfactant particles aligned along common direction is calculated in the Ciach-Hoye-Stell lattice model. We find that in the longitudinal direction antiferromagnetic ordering occurs in the whole region of stability of the homogeneous phase. A typical distance between neighboring oppositely oriented amphiphiles is different from the characteristic size of water domains. In the transversal direction, the form of the correlation function is related to the structure of the ordered low-temperature phase in coexistence with the microemulsion. In the proximity of the lamellar phase the correlation function decays monotonically indicating local "lamellar" ordering, while near the cubic bicontinuous phase it exhibits damped oscillations around zero.