Eur. Phys. J. E (2004) 13: 109-112
https://doi.org/10.1140/epje/e2004-00047-x

Surface and bulk interchange energy in binary mixtures of chain molecules

¹ Department of Physics, Bar-Ilan University, 52900, Ramat-Gan, Israel
² ExxonMobil Research and Engineering Co., Route 22 E., NJ 08801, Annandale, USA
³ Department of Physics, Brookhaven National Laboratory, NY 11973, Upton, USA
⁴ San Jose Research Center, Hitachi Global Storage Technologies, 650 Harry Road, CA 95120, San Jose, USA

^* e-mail: deutsch@mail.biu.ac.il

Abstract

The interchange (interaction) parameter, controlling the phase behaviour of a binary mixture, is determined for the bulk and the surface of binary mixtures of different types of chain molecules, using surface tensiometry and a mean-field theory. For all mixtures and concentrations studied an identical behaviour is observed at the surface, depending only on the square of the reduced chain length mismatch , where and are the difference in and average of the number of carbons of the two components.