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Monkenbusch M. Polymers: When S(Q,t) is not what you think! The role of dynamic RPA. EPJ WEB OF CONFERENCES 2022. [DOI: 10.1051/epjconf/202227201006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Investigating a (polymeric) soft-matter system with several components often is aimed at the observation of the motions/mobilities of one of the components. The normal approach to this request in the context of quasielastic neutron scattering (e.g. NSE) is to put contrast on the targeted component, typically by leaving it hydrogenated and have the rest (surrounding, matrix) deuterated. In simple systems with only one molecular species as a homo-polymer melt with a few of the molecules contrasted (e.g. 10% h in 90% d) -provided the h-and d-molecular varieties behave sufficiently equalthis strategy yields a valid single chain (molecule) structure factor S(Q,t)/S(Q), even for a 50/50% mixture. However, if the component of interest and the matrix are of different kind, unexpected distortions of the observed S(Q,t) may occur. Interpretation of such results in terms of the single chain structure factor would then lead to erroneous conclusions. In this contribution the conditions, under which these distortions will occur, are discussed and how dynamic RPA may help to cope with them is explained. A practical method to apply this correction to polymer and similar problems is presented and an experimental verification is discussed [1, 12].
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Jang WS, Koo P, Sykorsky M, Narayanan S, Sandy A, Mochrie SGJ. The Static and Dynamic Structure Factor of a Diblock Copolymer Melt via Small-Angle X-ray Scattering and X-ray Photon Correlation Spectroscopy. Macromolecules 2013. [DOI: 10.1021/ma4014548] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Woo-Sik Jang
- Deparment
of Physics, Yale University, New Haven, Connecticut 06511, United States
| | - Peter Koo
- Deparment
of Physics, Yale University, New Haven, Connecticut 06511, United States
| | - Marcin Sykorsky
- Linac
Coherent Light Source, Stanford Linear Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Suresh Narayanan
- Advanced
Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Alec Sandy
- Advanced
Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Simon G. J. Mochrie
- Deparment
of Physics, Yale University, New Haven, Connecticut 06511, United States
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Ruegg ML, Patel AJ, Narayanan S, Sandy AR, Mochrie SGJ, Watanabe H, Balsara NP. Condensed Exponential Correlation Functions in Multicomponent Polymer Blends Measured by X-ray Photon Correlation Spectroscopy. Macromolecules 2006. [DOI: 10.1021/ma061183y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Megan L. Ruegg
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, Yale University, New Haven, Connecticut 06520; Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; and Materials Sciences Division and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Amish J. Patel
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, Yale University, New Haven, Connecticut 06520; Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; and Materials Sciences Division and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Suresh Narayanan
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, Yale University, New Haven, Connecticut 06520; Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; and Materials Sciences Division and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Alec R. Sandy
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, Yale University, New Haven, Connecticut 06520; Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; and Materials Sciences Division and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Simon G. J. Mochrie
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, Yale University, New Haven, Connecticut 06520; Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; and Materials Sciences Division and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Hiroshi Watanabe
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, Yale University, New Haven, Connecticut 06520; Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; and Materials Sciences Division and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Nitash P. Balsara
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, Yale University, New Haven, Connecticut 06520; Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; and Materials Sciences Division and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
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