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1,119 results on '"Stamm M"'

1. Toroidal hollow-core microcavities produced by self-rolling of strained polymer bilayer films

Author

Luchnikov, V, Kumar, K, and Stamm, M

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Hollow-core toroidal micro-cavities are obtained by self-rolling of double-layer (polyvinyl pyridine/polystyrole) polymer films. Rolling of the bilayer is due to preferential swelling of the polyvinyl pyridine in water solution of dodecyl benzene sulfonic acid. The tube formation proceeds from a circular opening in the film made by photolithography or by mechanical scratching. The toroid equilibrium dimensions are determined by the balance of the elastic energy relaxation via the film scrolling and the work of the in-plane stretching that is due to increasing radius of the toroid. The principal features of the micro-toroid formation process are captured by a simple analytical model. The inner walls of the cavities can be made metal coated. To this aim, the polymer bilayer can be metallized by vacuum sputtering prior to lithographic patterning and rolling of the bilayer. The toroids with metallic inner surface are promising for the future research as IR-frequency range resonators.

Published
2023
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25. Superconducting high field magnet egineering at KIT

Author

Schneider, T., Beckenbach, M., Ernst, R., Hornung, F., Klaser, M., Lahn, H., Leys, P., Ruf, C., Neumann, H., and Stamm, M.

Subjects
Magnetic fields -- Analysis, Superconducting magnets -- Design and construction, Business, Electronics, Electronics and electrical industries
Published
2010

46. Neutron reflectometry studies on the interfacial width between polysterene and various poly(alkylmethacrylates)

Author

Schubert, D.W., Stamm, M., and Muller, A.H.E.

Subjects
Reflectometer -- Usage -- Research, Methyl methacrylate -- Research -- Usage, Polystyrene -- Research -- Usage, Engineering and manufacturing industries, Science and technology, Usage, Research
Abstract

From neutron reflectometry we have obtained the interfacial width (typically 2-8 nm) between incompatible polymers above the glass transition temperatures. The investigated polymer bilayers consist of a deuterated polystyrene top layer and various poly(alkylmethacrylates) as a bottom layer. We obtained interesting effects of the length of the alkyl group on the interfacial width. Using mean-field theory we calculate Flory-Huggins-Stavermann interaction parameters Χ from the interfacial width [a.sub.I] data. These results are compared with investigations of the interfacial width between deuterated poly(methylmethacrylate) and respective polyalkylmethacrylates., INTRODUCTION The understanding and controlling of compatibility between different polymers is one of the major problems in the field of polymers. It is the purpose of many efforts to optimize [...]

Published
1999

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