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A comparative atomic force microscopic study of liquid crystal films: transferred freely-suspended vs. Langmuir-Blodgett : morphology, lattice, and manipulation

Overney, R. M. and Meyer, E. and Frommer, J. and Guntherodt, H. J. and Decher, G. and Reibel, J. and Sohling, U.. (1993) A comparative atomic force microscopic study of liquid crystal films: transferred freely-suspended vs. Langmuir-Blodgett : morphology, lattice, and manipulation. Langmuir, Vol. 9, H. 1. pp. 341-346.

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Official URL: http://edoc.unibas.ch/dok/A5839509

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Abstract

The atomic force microscope (AFM) provides direct structural information on transferred freely-suspended films of liquid crystals, ranging from morphology on the ``large. scale of micrometers down to intermolecular spacing on the angstrom scale. Multilayer film thickness is measured, as well as monolayer step heights and unit cell parameters. We show here that these values for film thickness, step heights, and intermolecular spacing are often in good agreement with electron diffraction and X-ray reflectivity measurements. However, in some cases the AFM data reveal previously undetected lattices and defects. AFM measurements are also performed on Langmuir-Blodgett (LB) films of the same class of molecules, allowing comparison of the different film-forming techniques. The AFM has also been used as a tool to intentionally deform the films, creating features of tailored dimensions. The forces required to deform the films are discussed.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Chemical Society
ISSN:0743-7463
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:14 Sep 2012 07:17
Deposited On:14 Sep 2012 06:42

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