title: Neutron reflectivity studies of critical adsorption: behavior of the surface scaling function.
abstract: Neutron reflectometry has been employed to examine the nature of the critical adsorption surface scaling function for a near-critical mixture of hexane-d14+perfluorohexane adsorbing to a solid substrate from the liquid one-phase region. The analysis method of Dietrich and Schack has been applied to examine the nature of the power-law part of the critical adsorption surface scaling function, which has been found to behave as m(z) approximately P0z(-mu) as the critical point is approached. Values of mu = 0.514+/-0.018 and P0 = 0.90+/-0.04 have been obtained. These values are consistent with theoretical expectations (mu(th) = 0.516+/-0.004; P0(th) = 0.94+/-0.05), the value determined from Monte Carlo simulations (P(MC)0 = 0.866, and other experimental determinations (P(ex)0 = 0.955=/-0.08).
authors.affiliation: Department of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, United Kingdom.
authors.forename: James
authors.initials: J
authors.lastname: Bowers
authors.forename: Ali
authors.initials: A
authors.lastname: Zarbakhsh
authors.forename: Hugo K
authors.initials: HK
authors.lastname: Christenson
authors.forename: Ian A
authors.initials: IA
authors.lastname: McLure
authors.forename: John R P
authors.initials: JR
authors.lastname: Webster
authors.forename: Roland
authors.initials: R
authors.lastname: Steitz