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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:28 |
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Conference: Bucharest University Faculty of Physics 2004 Meeting
Section: Polymer Physics
Title:
Pattern Formation in Thin Polymer Films: A New Morphology
Authors:
Daniela Nedelcu, Cristina Miron, Florentina Simion, V. Barna, C.Berlic
Affiliation:
University of Bucharest, Faculty of Physics, Bucharest, Romania
E-mail
Keywords:
Abstract:
Researchers have shown that thin, nonwetting, liquid homopolymer films dewet
substrates, forming patterns that reflect fluctuations in the local film thickness. These patternshave been shown to be either discrete cylindrical holes or bicontinuous “spinodal-like” patterns.
In this work we show the existence of a new morphology. During the early stage of dewetting, discrete highly asymmetric holes appear spontaneously throughout the film. The nucleation rate of these holes is faster than their growth rate. The morphology of the late stage of evolution, is characterized by a bicontinuous pattern, distinct form conventional spinodal dewetting patterns. This morphology has been observed for a range of film thicknesses between 7.5 and 21nm. The structural evolution of this intermediate morphology is discussed.
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