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In Situ Observation of scaling Behavior During Solution-Phase Growth of Surfactant Monolayers

Published online by Cambridge University Press:  10 February 2011

Daniel K. Schwartz  and
Ivo Doudevski
Daniel K. Schwartz
Affiliation:
Department of Chemistry, Tulane University, New Orleans, LA 70118
Ivo Doudevski
Affiliation:
Department of Chemistry, Tulane University, New Orleans, LA 70118
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Abstract

“Self-assembled” monolayers of amphiphilic surfactant molecules form spontaneously on solid surfaces by exposure to dilute solutions of the adsorbate molecules. These monolayers are shown to form via a mechanism that includes nucleation, growth, coalescence, etc. of densely- packed submonolayer islands of the long-chain organic molecules. In situ atomic force microscopy experiments allow a quantitative analysis of island nucleation and growth rates as well as determination of the island size distribution as a function of coverage. In the growth regime, the nucleation and growth rates have a power law behavior consistent with a simple point island model of 2D cluster growth. The exponents are consistent with a critical nucleus of two molecules and the 2D diffusion coefficient corresponds to a “hopping time” of about 1 microsecond. In the aggregation regime, the island size distributions are shown to scale with a single evolving length scale in accordance with the dynamical scaling approximation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 570: Symposium V – Epitaxial Growth , 1999 , 163
Copyright
Copyright © Materials Research Society 1999

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References

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