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Petermann M, Dianteill L, Zeidi A, Vaha Ouloassekpa R, Budisavljevic P, Le Men C, Montanier C, Roblin P, Cabane B, Schweins R, Dumon C, Bouchoux A. Arabinoxylan in Water through SANS: Single-Chain Conformation, Chain Overlap, and Clustering. Biomacromolecules 2023; 24:3619-3628. [PMID: 37526635 DOI: 10.1021/acs.biomac.3c00374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Using small-angle neutron scattering (SANS), we examine the structure and conformational behavior of wheat arabinoxylan (AX) prepared at various concentrations in a sodium phosphate aqueous buffer. As for another major hemicellulose, xyloglucan, we observe a small number of large clusters surrounded by AX chains that behave exactly as a polymer in good solvent with a Flory exponent ν = 0.588. The fit of the data at high q-values to a standard worm-like chain model gives the persistence length lp = 45 Å and cross section of the chains 2Rc = 11-12 Å. In addition, using a dedicated modeling approach, we extract from the SANS data at the intermediate q-range the correlation length ξ of the solutions in the semidilute regime. The decay of ξ with concentration follows a scaling law that further confirms the self-avoiding statistical behavior of the AX chains. This first comprehensive study about the properties of water-soluble AX at different length scales may help in the development of products and processes involving AX as a substitute for fossil carbon molecules.
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Affiliation(s)
- Maike Petermann
- TBI, Université de Toulouse, CNRS, INRAE, INSA, 31077 Toulouse, France
| | - Lucie Dianteill
- TBI, Université de Toulouse, CNRS, INRAE, INSA, 31077 Toulouse, France
| | - Amal Zeidi
- TBI, Université de Toulouse, CNRS, INRAE, INSA, 31077 Toulouse, France
| | | | | | - Claude Le Men
- TBI, Université de Toulouse, CNRS, INRAE, INSA, 31077 Toulouse, France
| | - Cédric Montanier
- TBI, Université de Toulouse, CNRS, INRAE, INSA, 31077 Toulouse, France
| | - Pierre Roblin
- Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 31062 Toulouse, France
| | | | - Ralf Schweins
- Institut Laue-Langevin, DS/LSS, 71 Avenue des Martyrs, CS-20156, 38042 Grenoble, France
| | - Claire Dumon
- TBI, Université de Toulouse, CNRS, INRAE, INSA, 31077 Toulouse, France
| | - Antoine Bouchoux
- TBI, Université de Toulouse, CNRS, INRAE, INSA, 31077 Toulouse, France
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Affiliation(s)
- Valerio Sorichetti
- Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), CNRS, Université Paris-Saclay, F-91405 Orsay, France
- Laboratoire Charles Coulomb (L2C), Université Montpellier, CNRS, F-34095 Montpellier, France
- IATE, Université Montpellier, INRAE, Institut Agro, F-34060 Montpellier, France
| | - Virginie Hugouvieux
- IATE, Université Montpellier, INRAE, Institut Agro, F-34060 Montpellier, France
| | - Walter Kob
- Laboratoire Charles Coulomb (L2C), Université Montpellier, CNRS, F-34095 Montpellier, France
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Abstract
The objective of this work is to investigate the thermodynamic and scattering behavior of tetra-poly(ethylene glycol) (PEG) gels. Complementary measurements, including osmotic swelling pressure, elastic modulus, and small angle neutron scattering (SANS), are reported for a series of tetra-PEG gels made from different molecular weight precursor chains at different concentrations. Analysis of the osmotic swelling pressure vs polymer volume fraction curves makes it possible to separate the elastic and mixing contributions of the network free energy. It is shown that in tetra-PEG gels these free energy components are additive. The elastic term varies with the one-third power of the polymer volume fraction and its numerical value is equal to the shear modulus obtained from independent mechanical measurements. The mixing pressure of the cross-linked polymer is slightly smaller than that of the corresponding solution of the uncross-linked polymer of infinite molecular weight but it exhibits similar dependence on the polymer concentration. The observed deviation between the osmotic mixing pressures of the gel and the solution can be attributed to the presence of small amount of structural inhomogeneities frozen-in by the cross-links. SANS reveals that the scattering response of tetra-PEG gel is mainly governed by the thermodynamic concentration fluctuations of the network, i.e., the contribution from static inhomogeneities to the SANS signal is small.
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Affiliation(s)
- Ferenc Horkay
- Section on Quantitative Imaging and Tissue Sciences, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Kengo Nishi
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Mitsuhiro Shibayama
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Søndergaard RV, Christensen NM, Henriksen JR, Kumar EKP, Almdal K, Andresen TL. Facing the Design Challenges of Particle-Based Nanosensors for Metabolite Quantification in Living Cells. Chem Rev 2015; 115:8344-78. [PMID: 26244372 DOI: 10.1021/cr400636x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Rikke V Søndergaard
- Department of Micro- and Nanotechnology, Technical University of Denmark , Produktionstorvet 423, 2800 Lyngby, Denmark
| | - Nynne M Christensen
- Department of Micro- and Nanotechnology, Technical University of Denmark , Produktionstorvet 423, 2800 Lyngby, Denmark
| | - Jonas R Henriksen
- Department of Micro- and Nanotechnology, Technical University of Denmark , Produktionstorvet 423, 2800 Lyngby, Denmark
| | - E K Pramod Kumar
- Department of Micro- and Nanotechnology, Technical University of Denmark , Produktionstorvet 423, 2800 Lyngby, Denmark
| | - Kristoffer Almdal
- Department of Micro- and Nanotechnology, Technical University of Denmark , Produktionstorvet 423, 2800 Lyngby, Denmark
| | - Thomas L Andresen
- Department of Micro- and Nanotechnology, Technical University of Denmark , Produktionstorvet 423, 2800 Lyngby, Denmark
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Affiliation(s)
- Mohsen Dahesh
- Université Montpellier 2, Laboratoire Charles Coulomb
UMR 5221, F-34095, Montpellier, France
- CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France
- UMR IATE, UM2-CIRAD-INRA-SupAgro, 2 pl Pierre Viala, 34070 Montpellier, France
| | - Amélie Banc
- Université Montpellier 2, Laboratoire Charles Coulomb
UMR 5221, F-34095, Montpellier, France
- CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France
| | - Agnès Duri
- UMR IATE, UM2-CIRAD-INRA-SupAgro, 2 pl Pierre Viala, 34070 Montpellier, France
| | - Marie-Hélène Morel
- UMR IATE, UM2-CIRAD-INRA-SupAgro, 2 pl Pierre Viala, 34070 Montpellier, France
| | - Laurence Ramos
- Université Montpellier 2, Laboratoire Charles Coulomb
UMR 5221, F-34095, Montpellier, France
- CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France
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Abstract
The preparation of gels of poly(dimethylsiloxane) (PDMS) reported in the literature so far involves catalysts and chemical cross-links (chemical gels) or functionalization with organogelators. We report that thermoreversible physical gels of PDMS, without cross-links or functionalization, can be made with propylamine or hexylamine as a solvent. The gels consist of spherical domains as small as 20 nm. We show that these spherical domains are part of a network. Differential scanning calorimetry (DSC), optical microscopy, and rheology show that the gel is thermoreversible. With the DSC experiments, we have devised a procedure to achieve thermoreversibility with very similar gel-sol transition endotherms in the first and second heating cycles.
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Affiliation(s)
- Elianne Dahan
- Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada
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Abstract
Self-healing hydrogels can be made using either reversible covalent cross-links or coordination chemistry bonds. Here we present a multi-pH-responsive system inspired by the chemistry of blue mussel adhesive proteins. By attaching DOPA to an amine-functionalized polymer, a multiresponsive system is formed upon reaction with iron. The degree of polymer cross-linking is pH controlled through the pH-dependent DOPA/iron coordination chemistry. This leads to the formation of rapidly self-healing high-strength hydrogels when pH is raised from acidic toward basic values. Close to the pK(a) value, or more precisely the pI value, of the polymer, the gel collapses due to reduced repulsion between polymer chains. Thereby a bistable gel-system is obtained. The present polymer system more closely resembles mussel adhesive proteins than those previously reported and thus also serves as a model system for mussel adhesive chemistry.
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Affiliation(s)
- Marie Krogsgaard
- iNANO and Department of Chemistry, Aarhus University , 14 Gustav Wieds Vej, Aarhus, Denmark
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Chassé W, Lang M, Sommer JU, Saalwächter K. Cross-Link Density Estimation of PDMS Networks with Precise Consideration of Networks Defects. Macromolecules 2011. [DOI: 10.1021/ma202030z] [Citation(s) in RCA: 141] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Walter Chassé
- Institut für Physik — NMR, Martin-Luther-Universität Halle-Wittenberg,
Betty-Heimann-Strasse 7, D-06120 Halle, Germany
| | - Michael Lang
- Leibniz-Institut für Polymerforschung Dresden, e.V., Hohe Strasse 6, D-01069 Dresden, Germany
| | - Jens-Uwe Sommer
- Leibniz-Institut für Polymerforschung Dresden, e.V., Hohe Strasse 6, D-01069 Dresden, Germany
| | - Kay Saalwächter
- Institut für Physik — NMR, Martin-Luther-Universität Halle-Wittenberg,
Betty-Heimann-Strasse 7, D-06120 Halle, Germany
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Lee D, Gutowski IA, Bailey AE, Rubatat L, de Bruyn JR, Frisken BJ. Investigating the microstructure of a yield-stress fluid by light scattering. Phys Rev E Stat Nonlin Soft Matter Phys 2011; 83:031401. [PMID: 21517498 DOI: 10.1103/physreve.83.031401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Indexed: 05/30/2023]
Abstract
We report the results of an experimental study of the microstructure of dispersions of Carbopol ETD 2050, a model yield-stress fluid. Using two different light scattering instruments, measurements were made over three decades in scattering wave vector, from 0.02 to 25 μm⁻¹. These measurements reveal microstructure characterized by two length scales: a longer length scale, 6 μm and larger, that depends on Carbopol concentration and the pH of the dispersion and a shorter length scale of approximately 400 nm that is independent of both sample concentration and pH. We relate these results to shear rheology measurement of the yield stress of these materials.
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Affiliation(s)
- David Lee
- Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A1S6, Canada
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Schack NB, Oliveira CLP, Young NWG, Pedersen JS, Ogilby PR. Oxygen diffusion in cross-linked, ethanol-swollen poly(vinyl alcohol) gels: counter-intuitive results reflect microscopic heterogeneities. Langmuir 2009; 25:1148-1153. [PMID: 19099533 DOI: 10.1021/la803024h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Oxygen diffusion coefficients have been determined in ethanol-swollen poly(vinyl alcohol), PVA, gels using a technique wherein oxygen sorption is optically monitored using singlet oxygen phosphorescence. Data were recorded as a function of the extent to which the PVA chains are chemically cross-linked using glutaraldehyde. Contrary to conventional expectation, the diffusion coefficients obtained increase with an increase in the extent of cross-linking. This observation is interpreted in terms of a cross-link-dependent increase in the microscopic heterogeneity of the polymer wherein dense cross-linked domains coexist with more fluid domains. It is expected that, in the latter domains, segmental motions of the macromolecule that facilitate oxygen diffusion are more readily achieved. This model of cross-link-dependent heterogeneity is supported by the results of small-angle X-ray scattering experiments. Among other things, the data reported herein provide an informative foundation for studies of small molecule diffusion in biological cells, particularly during photoinduced cell death where the hydrogel-like nature of the cell can change due to cross-linking reactions.
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Affiliation(s)
- Nickolass Bitsch Schack
- Center for Oxygen Microscopy and Imaging, Department of Chemistry, and The Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, DK-8000 Arhus, Denmark
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Wang Y, Coombs N, Manners I, Winnik MA. Contrast Inversion in TEM Studies of Poly(ferrocenylsilane)‐block‐Poly(dimethylsiloxane) Diblock Copolymers. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Viers BD, Mark JE. Elastomeric Properties of Polysiloxane Networks. Bimodal Elastomers that are Spatially Inhomogeneous and Others that are Very Broadly Multimodal. Journal of Macromolecular Science, Part A 2007. [DOI: 10.1080/10601320601030657] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Sukumaran SK, Beaucage G, Mark JE, Viers B. Neutron scattering from equilibrium-swollen networks. Eur Phys J E Soft Matter 2005; 18:29-36. [PMID: 16179971 DOI: 10.1140/epje/i2005-10030-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2005] [Accepted: 06/30/2005] [Indexed: 05/04/2023]
Abstract
Small-angle neutron scattering measurements were performed on end-linked poly (dimethylsiloxane) (PDMS) networks swollen to equilibrium with d-benzene. Comparison was made with equivalent concentration PDMS solutions. Equilibrium-swollen networks consistently displayed a linear scattering regime at low q followed by a good-solvent-like scaling regime at high q in agreement with the predictions of the Gel Tensile Blob (GTB) model. Data are fit using the unified function modified for the GTB model (3-parameter fit). Equilibrium-swollen networks display a base structural size, the gel tensile-blob size, xi, that was found to be independent of the molecular weight between crosslinks for the series of molecular weights studied, consistent with the predictions of the model. The length of the extended tensile structure, L, can be larger than the length of the fully extended network strand. The predicted scaling relationship for L, L approximately Q(1/2)N(avg), where N(avg) = (1/fN(c)(2) + 1/4N(e)(2), Q is the equilibrium swelling ratio, N(c) is the molecular weight between crosslinks, N(e) is the entanglement molecular weight and f is the crosslink functionality is in agreement with experimental results for the networks studied.
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Affiliation(s)
- S K Sukumaran
- Department of Materials Science and Engineering, University of Cincinnati, OH 45221-0012, USA
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Kawamura T, Urayama K, Kohjiya S. Small angle x-ray scattering study on role of trapped entanglements in structure of swollen end-linked poly(dimethylsiloxane) networks. J Chem Phys 2000. [DOI: 10.1063/1.481521] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yim H, Kent M, McNamara WF, Ivkov R, Satija S, Majewski J. Structure within Thin Epoxy Films Revealed by Solvent Swelling: A Neutron Reflectivity Study. Macromolecules 1999. [DOI: 10.1021/ma990990c] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | - J. Majewski
- LANCSE, Los Alamos National Laboratories, Los Alamos, New Mexico
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Lay S, Sommer JU, Blumen A. Comparison of structural properties of different polymer network types as obtained by computer simulation. J Chem Phys 1999. [DOI: 10.1063/1.479154] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Affiliation(s)
- Ferenc Horkay
- General Electric Corporate Research and Development, P.O. Box 8, Schenectady, New York 12301
| | - Anne-Marie Hecht
- Laboratoire de Spectrométrie Physique, CNRS UMR5588, B.P 87, 38402 St. Martin d'Hères Cedex, France
| | - Erik Geissler
- Laboratoire de Spectrométrie Physique, CNRS UMR5588, B.P 87, 38402 St. Martin d'Hères Cedex, France
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Urayama K, Kawamura T, Hirata Y, Kohjiya S. SAXS study on poly(dimethylsiloxane) networks with controlled distributions of chain lengths between crosslinks. POLYMER 1998; 39:3827-33. [DOI: 10.1016/s0032-3861(97)10382-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Coviello T, Burchard W, Geissler E, Maier D. Static and Dynamic Light Scattering by a Thermoreversible Gel from Rhizobium leguminosarum 8002 Exopolysaccharide. Macromolecules 1997. [DOI: 10.1021/ma961651b] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tommasina Coviello
- Institut für Makromolekulare Chemie, Universität Freiburg, 79104 Freiburg, Germany
| | - Walther Burchard
- Institut für Makromolekulare Chemie, Universität Freiburg, 79104 Freiburg, Germany
| | - Erik Geissler
- Laboratoire Spectrometrie Physique, Université Joseph Fourier, Grenoble, 38402 St. Martin D'Heres, France
| | - Dieter Maier
- Fakultät für Physik, Universität Freiburg, 79104, Germany
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Geissler E, Horkay F, Hecht A, Rochas C, Lindner P, Bourgaux C, Couarraze G. Investigation of PDMS gels and solutions by small angle scattering. POLYMER 1997; 38:15-20. [DOI: 10.1016/s0032-3861(96)00490-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Affiliation(s)
- Sergei Panyukov
- Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
| | - Yitzhak Rabin
- Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
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Falcão AN, Pedersen JS, Mortensen K, Boué F. Polydimethylsiloxane Networks at Equilibrium Swelling: Extracted and Nonextracted Networks. Macromolecules 1996. [DOI: 10.1021/ma941014q] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- António N. Falcão
- Department of Solid State Physics, Risø National Laboratory, DK-4000 Roskilde, Denmark
| | - Jan Skov Pedersen
- Department of Solid State Physics, Risø National Laboratory, DK-4000 Roskilde, Denmark
| | - Kell Mortensen
- Department of Solid State Physics, Risø National Laboratory, DK-4000 Roskilde, Denmark
| | - François Boué
- Laboratoire Léon-Brillouin, Laboratoire mixte CEA−CNRS, Saclay, France
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