Europhys. Lett., 64 (3) , pp. 385-391 (2003)
Incomplete transfer-induced interfacial roughening of Langmuir-Blodgett filmsM. 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