Europhys. Lett.
Volume 64, Number 3, November 2003
Page(s) 385 - 391
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00206-0
Europhys. Lett., 64 (3) , pp. 385-391 (2003)

Incomplete transfer-induced interfacial roughening of Langmuir-Blodgett films

M. Li1, X.-H. Li1, L. Huang2, Q.-J. Jia3, W.-L. Zheng3 and Z.-H. Mai1

1  Institute of Physics, Chinese Academy of Sciences - Beijing 100080, PRC
2  College of Chemistry and Molecular Engineering - Peking University, PRC
3  Beijing Synchrotron Radiation Facility - Beijing 100039, PRC

(Received 15 April 2003; accepted in final form 26 August 2003)

A growth model is proposed for the interfacial evolution of imperfect Langmuir-Blodgett films. It indicates that the kinetic roughening arises from the incomplete membrane transfer. But the surface tension depresses the fluctuations, leading to a logarithmic interfacial correlation. The finite defect size and the finite film thickness result in a short-distance cutoff and a long-distance saturation, respectively. A correlation function is derived to explain the X-ray scattering data of the films, from which the mean size of the desorbed patches and the healing length of the growing membranes are estimated.

68.47.Pe - Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces.
61.10.-i - X-ray diffraction and scattering.
68.55.-a - Thin film structure and morphology.

© EDP Sciences 2003