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Authors
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Henneberg, O; Geue, T; Saphiannikova, M. ; Pietsch, U; Natansohn, A; Rochon, P; Finkelstein, K;
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Title
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Investigation of material flow on inscribing a polymer surface grating probing X-ray and VIS light scattering
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Date
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13.02.2002
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Number
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417
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Abstract
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Surface relief patterning on amorphous polymer films containing azobenzene-side chains can be performed by holographic exposure with visible light of about 488 nm at room temperature. In order to understand the dynamics of the induced material flow we performed in-situ time-resolved coherent X-ray and VIS light scattering measurements at exposure with a holographic pattern obtained using circularly polarised light of 40 mW cm(-2). The films under investigation were made from the polar azobenzene side-chain homopolymers. The efficiency of grating formation is probed by the time development of the first-order grating peak intensities, While the VIS signal increases continuously during continuous holographic exposure. the X-ray grating peak intensity reaches a maximum after about 60 s and decreases thereafter. Similar measurements during short time exposure show that the maximum of the X-ray signal depends of the pulse length of the inscribing light. An analysis of the time evolution of the VIS scattering reveals the existence of sequential elastic and plastic processes during exposure, Both experiments can be explained qualitatively by assuming the formation of a density grating in addition to the surface relief patterning. Our assumption are validated by model calculations using a finite element (FE) approach including a sinusoidal force distribution accompanied by visco-elastic flow. (C) 2002 Elsevier Science B.V. All rights reserved.
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Publisher
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Colloids and Surfaces A: Physicochemical and Engineering Aspects
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Wikidata
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Citation
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Colloids and Surfaces A: Physicochemical and Engineering Aspects 198-200 (2002) 107-111
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DOI
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https://doi.org/10.1016/S0927-7757(01)00921-9
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