Dr. Svetlana A. Prokhorova Profile

Dr. Svetlana A. Prokhorova

Group Leader at Univ Freiburg

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Proceedings Article | 29 April 2003 Paper

Polymer substrates as a medium for motion of nano objects

Svetlana Prokhorova, Alexey Kopyshev, Ayothi Ramakrishnan, Haining Zhang, Jurgen Ruhe

Proceedings Volume 5118, (2003) https://doi.org/10.1117/12.498948

KEYWORDS: Polymers, Switching, Liquids, Silica, Atomic force microscopy, Particles, Nanoparticles, Silicon, Photomicroscopy, Polymethylmethacrylate

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We discuss a novel pathway to move nano objects on or by a supporting polymer substrate. The idea is to use a periodically switchable topography of the underlying polymer surface, induced by two states: structured and flat. The polymer system we focus on are surface attached polymer chains ('polymer brushes') of two types: (i) diblock-copolymer chains densely grafted with one end to the solid substrate and (ii) a mixed brush composed of the mixture of A and B homopolymers, A-B blocks and random A-B chains. Recently, we have shown that both these brushes undergo reversible transitions between lateral and vertical microphase separation. Since the details of the switching process are crucial for understanding transport properties, we report here in-situ AFM observation of the switching process of a poly(methylmethacrylate-b-glycidylmethacrylate) p(MMA-b-GMA) diblock-copolymer brush and PMMA-PGMA mixed brush. The transition is induced by cyclically pumping chloroform and toluene vapours through the liquid cell: they represent a good (chloroform) and a bad solvent (toluene) to the brushes. We then report on results of motion and organization processes of silica particles induced by switching the polymer carpet in vapour and compare the results with the organization process of the same nano objects performed in liquids.

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