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Gutfreund P, Higy C, Fragneto G, Tschopp M, Felix O, Decher G. Molecular conformation of polyelectrolytes inside Layer-by-Layer assembled films. Nat Commun 2023; 14:4076. [PMID: 37429844 DOI: 10.1038/s41467-023-39801-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 06/29/2023] [Indexed: 07/12/2023] Open
Abstract
Among all methods available for the preparation of multifunctional nanostructured composite materials with remarkable functional properties, Layer-by-Layer (LbL) assembly is currently one of the most widely used techniques due to its environmental friendliness, its ease of use and its versatility in combining a plethora of available colloids and macromolecules into finely tuned multicomponent architectures with nanometer scale control. Despite the importance of these systems in emerging technologies, their nanoscopic 3D structure, and thus the ability to predict and understand the device performance, is still largely unknown. In this article, we use neutron scattering to determine the average conformation of individual deuterated polyelectrolyte chains inside LbL assembled films. In particular, we determine that in LbL-films composed of poly(sodium 4-styrenesulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) multilayers prepared from 2 M sodium chloride solutions the PSS chains exhibit a flattened coil conformation with an asymmetry factor of around seven. Albeit this highly non-equilibrium state of the polymer chain, its density profiles follow Gaussian distributions occupying roughly the same volume as in the bulk complex.
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Affiliation(s)
- Philipp Gutfreund
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042, Grenoble, France.
| | - Christophe Higy
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042, Grenoble, France
- Institut Charles Sadron, Université de Strasbourg, 67034, Strasbourg, France
| | - Giovanna Fragneto
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042, Grenoble, France
- European Spallation Source ERIC, P.O. Box 176, 22100, Lund, Sweden
| | - Michel Tschopp
- Institut Charles Sadron, Université de Strasbourg, 67034, Strasbourg, France
| | - Olivier Felix
- Institut Charles Sadron, Université de Strasbourg, 67034, Strasbourg, France
| | - Gero Decher
- Institut Charles Sadron, Université de Strasbourg, 67034, Strasbourg, France
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2
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Paracini N, Gutfreund P, Welbourn R, Gonzalez-Martinez JF, Zhu K, Miao Y, Yepuri N, Darwish TA, Garvey C, Waldie S, Larsson J, Wolff M, Cárdenas M. Structural Characterization of Nanoparticle-Supported Lipid Bilayer Arrays by Grazing Incidence X-ray and Neutron Scattering. ACS APPLIED MATERIALS & INTERFACES 2023; 15:3772-3780. [PMID: 36625710 PMCID: PMC9880997 DOI: 10.1021/acsami.2c18956] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Arrays of nanoparticle-supported lipid bilayers (nanoSLB) are lipid-coated nanopatterned interfaces that provide a platform to study curved model biological membranes using surface-sensitive techniques. We combined scattering techniques with direct imaging, to gain access to sub-nanometer scale structural information on stable nanoparticle monolayers assembled on silicon crystals in a noncovalent manner using a Langmuir-Schaefer deposition. The structure of supported lipid bilayers formed on the nanoparticle arrays via vesicle fusion was investigated using a combination of grazing incidence X-ray and neutron scattering techniques complemented by fluorescence microscopy imaging. Ordered nanoparticle assemblies were shown to be suitable and stable substrates for the formation of curved and fluid lipid bilayers that retained lateral mobility, as shown by fluorescence recovery after photobleaching and quartz crystal microbalance measurements. Neutron reflectometry revealed the formation of high-coverage lipid bilayers around the spherical particles together with a flat lipid bilayer on the substrate below the nanoparticles. The presence of coexisting flat and curved supported lipid bilayers on the same substrate, combined with the sub-nanometer accuracy and isotopic sensitivity of grazing incidence neutron scattering, provides a promising novel approach to investigate curvature-dependent membrane phenomena on supported lipid bilayers.
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Affiliation(s)
- Nicolò Paracini
- Department
for Biomedical Science and Biofilms − Research Center for Biointerfaces,
Faculty of Health and Society, Malmö
University, 205 06Malmö, Sweden
| | | | - Rebecca Welbourn
- ISIS
Neutron & Muon Source, STFC, Rutherford
Appleton Laboratory, Harwell, OxfordshireOX11 0QX, U.K.
| | - Juan Francisco Gonzalez-Martinez
- Department
for Biomedical Science and Biofilms − Research Center for Biointerfaces,
Faculty of Health and Society, Malmö
University, 205 06Malmö, Sweden
| | - Kexin Zhu
- School
of Biological Sciences, Nanyang Technological
University, 639798Singapore
| | - Yansong Miao
- School
of Biological Sciences, Nanyang Technological
University, 639798Singapore
| | - Nageshwar Yepuri
- National
Deuteration Facility, Australian Nuclear
Science and Technology Organization (ANSTO), Lucas Heights, NSW2234, Australia
| | - Tamim A. Darwish
- National
Deuteration Facility, Australian Nuclear
Science and Technology Organization (ANSTO), Lucas Heights, NSW2234, Australia
| | - Christopher Garvey
- Heinz
Maier-Leibnitz
Zentrum (MLZ), Technische Universität
München, Lichtenbergstraβe 1, 85748Garching, Germany
| | - Sarah Waldie
- Department
for Biomedical Science and Biofilms − Research Center for Biointerfaces,
Faculty of Health and Society, Malmö
University, 205 06Malmö, Sweden
| | - Johan Larsson
- Department
for Biomedical Science and Biofilms − Research Center for Biointerfaces,
Faculty of Health and Society, Malmö
University, 205 06Malmö, Sweden
| | - Max Wolff
- Department
of Physics and Astronomy, Uppsala University, Box 516, 751 20Uppsala, Sweden
| | - Marité Cárdenas
- Department
for Biomedical Science and Biofilms − Research Center for Biointerfaces,
Faculty of Health and Society, Malmö
University, 205 06Malmö, Sweden
- School
of Biological Sciences, Nanyang Technological
University, 639798Singapore
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3
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Lauter V, Wang K, Mewes T, Glavic A, Toperverg B, Ahmadi M, Assaf B, Hu B, Li M, Liu X, Liu Y, Moodera J, Rokhinson L, Singh D, Sun N. M-STAR: Magnetism second target advanced reflectometer at the Spallation Neutron Source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:103903. [PMID: 36319315 DOI: 10.1063/5.0093622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 08/22/2022] [Indexed: 06/16/2023]
Abstract
M-STAR is a next generation polarized neutron reflectometer with advanced capabilities. A new focusing guide concept is optimized for samples with dimensions down to a millimeter range. A proposed hybrid pulse-skipping chopper will enable experiments at constant geometry at one incident angle in a broad range of wavevector transfer Q up to 0.3 A-1 for specular, off-specular, and GISANS measurements. M-STAR will empower nanoscience and spintronics studies routinely on small samples (∼2 × 2 mm2) and of atomic-scale thickness using versatile experimental conditions of magnetic and/or electric fields, light, and temperature applied in situ to novel complex device-like nanosystems with multiple buried interfaces. M-STAR will enable improved grazing incidence diffraction measurements, as a surface-sensitive depth-resolved probe of, e.g., the out-of-plane component of atomic magnetic moments in ferromagnetic, antiferromagnetic, and more complex structures as well as in-plane atomic-scale structures inaccessible with contemporary diffractometry and reflectometry. New horizons will be opened by the development of an option to probe near-surface dynamics with inelastic grazing incidence scattering in the time-of-flight mode. These novel options in combination with ideally matched parameters of the second target station will place M-STAR in the world's leading position for high resolution polarized reflectometry.
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Affiliation(s)
- Valeria Lauter
- Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, USA
| | - Kang Wang
- Department of Electrical and Computer Engineering, Department of Physics, Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA
| | - Tim Mewes
- Magnetics Laboratory, Department of Physics and Astronomy, The University of Alabama, 1008 Bevill Bldg., Tuscaloosa, Alabama 3548, USA
| | - Artur Glavic
- Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Boris Toperverg
- Department of Solid State Physics, Experimental Physics, Ruhr-University Bochum, Universitetsstrasse 150, Bochum D-44781, Germany
| | - Mahshid Ahmadi
- Department of Materials Science and Engineering, Institute for Advanced Materials and Manufacturing, University of Tennessee, 2641 Osprey Vista Way, Knoxville, Tennessee 37920, USA
| | - Badih Assaf
- 225 Nieuwland Science Center, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Bin Hu
- Department of Materials Science and Engineering, Institute for Advanced Materials and Manufacturing, University of Tennessee, 2641 Osprey Vista Way, Knoxville, Tennessee 37920, USA
| | - Mingda Li
- Massachusetts Institute of Technology, 77 Massachusetts Ave., Bldg. 24-209, Cambridge, Massachusetts 02139, USA
| | - Xinyu Liu
- 225 Nieuwland Science Center, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Yaohua Liu
- Second Target Station, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, USA
| | - Jagadeesh Moodera
- Massachusetts Institute of Technology, 77 Massachusetts Ave., Bldg. 24-209, Cambridge, Massachusetts 02139, USA
| | - Leonid Rokhinson
- Department of Physics, Purdue University, West Lafayette, Indiana 47906, USA
| | - Deepak Singh
- 223 Physics Building, Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA
| | - Nian Sun
- Electrical and Computer Engineering Department, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA
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4
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Vaillard AS, El Haitami A, Dreier LB, Fontaine P, Cousin F, Gutfreund P, Goldmann M, Backus EHG, Cantin S. Vertically Heterogeneous 2D Semi-Interpenetrating Networks Based on Cellulose Acetate and Cross-Linked Polybutadiene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2538-2549. [PMID: 35171621 DOI: 10.1021/acs.langmuir.1c03084] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This work reports the feasibility of polybutadiene (PB) cross-linking under UV irradiation in the presence of a linear polymer, cellulose acetate (CA), to form semi-interpenetrating polymer networks at the air-water interface. The thermodynamic properties and the morphology of two-dimensional (2D) CA/PB blends are investigated after UV irradiation and for a wide range of CA volume fractions. A contraction of the mixed Langmuir films is observed independent of the composition, in agreement with that recorded for the individual PB monolayer after cross-linking. The PB network formation is demonstrated by in situ sum-frequency generation spectroscopy on the equivolumic CA/PB mixed film. From Brewster angle microscopy observations, the PB network synthesis does not induce any morphology change at the mesoscopic scale, and all of the mixed films remain homogeneous laterally. In situ neutron reflectometry is used to probe the effect of PB cross-linking on the vertical structure of CA/PB mixed films. For all studied compositions, significant thickening of the films is evidenced, consistent with their contraction ratio. This thickening is accompanied by a partial expulsion of the PB toward the film-air interface, which is attributed to the hydrophobic character of the PB. This phenomenon is stronger for films rich in PB. In particular, the structure of the PB-rich film undergoes a transition from vertically homogeneous to inhomogeneous along the depth. 2D semi-interpenetrating polymer networks can thus be synthesized at the air-water interface with a morphology that is strongly influenced by the polymer-polymer and polymer-environment interactions.
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Affiliation(s)
| | | | - Lisa B Dreier
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Philippe Fontaine
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Gif sur Yvette Cedex, France
| | - Fabrice Cousin
- Laboratoire Léon Brillouin, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | | | - Michel Goldmann
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Gif sur Yvette Cedex, France
- Institut des NanoSciences de Paris, Sorbonne Université, 75252 Paris Cedex 05, France
- Faculté des Sciences Fondamentales et Biomédicales, Université de Paris, 75006 Paris, France
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, A-1090 Vienna, Austria
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5
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Caselli L, Ridolfi A, Mangiapia G, Maltoni P, Moulin JF, Berti D, Steinke NJ, Gustafsson E, Nylander T, Montis C. Interaction of nanoparticles with lipid films: the role of symmetry and shape anisotropy. Phys Chem Chem Phys 2021; 24:2762-2776. [PMID: 34647947 DOI: 10.1039/d1cp03201a] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The bioactivity, biological fate and cytotoxicity of nanomaterials when they come into contact with living organisms are determined by their interaction with biomacromolecules and biological barriers. In this context, the role of symmetry/shape anisotropy of both the nanomaterials and biological interfaces in their mutual interaction, is a relatively unaddressed issue. Here, we study the interaction of gold nanoparticles (NPs) of different shapes (nanospheres and nanorods) with biomimetic membranes of different morphology, i.e. flat membranes (2D symmetry, representative of the most common plasma membrane geometry), and cubic membranes (3D symmetry, representative of non-lamellar membranes, found in Nature under certain biological conditions). For this purpose we used an ensemble of complementary structural techniques, including Neutron Reflectometry, Grazing Incidence Small-Angle Neutron Scattering, on a nanometer lengthscale and Confocal Laser Scanning Microscopy on a micrometer length scale. We found that the structural stability of the membrane towards NPs is dependent on the topological characteristic of the lipid assembly and of the NPs, where a higher symmetry gave higher stability. In addition, Confocal Laser Scanning Microscopy analyses highlighted that NPs interact with cubic and lamellar phases according to two distinct mechanisms, related to the different structures of the lipid assemblies. This study for the first time systematically addresses the role of NPs shape in the interaction with lipid assemblies with different symmetry. The results will contribute to improve the fundamental knowledge on lipid interfaces and will provide new insights on the biological function of phase transitions as a response strategy to the exposure of NPs.
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Affiliation(s)
- Lucrezia Caselli
- Department of Chemistry, University of Florence and CSGI, Florence, Italy.
| | - Andrea Ridolfi
- Department of Chemistry, University of Florence and CSGI, Florence, Italy. .,ISMN-CNR and CSGI, Bologna, Italy
| | - Gaetano Mangiapia
- German Engineering Materials Science Centre (GEMS) at Heinz Maier-Leibnitz Zentrum (MLZ), Helmholtz-Zentrum Hereon, Lichtenbergstr. 1, 85748 Garching bei München, Germany
| | | | - Jean-François Moulin
- German Engineering Materials Science Centre (GEMS) at Heinz Maier-Leibnitz Zentrum (MLZ), Helmholtz-Zentrum Hereon, Lichtenbergstr. 1, 85748 Garching bei München, Germany
| | - Debora Berti
- Department of Chemistry, University of Florence and CSGI, Florence, Italy.
| | | | - Emil Gustafsson
- Department of Chemistry, Uppsala University, Uppsala, Sweden
| | - Tommy Nylander
- Department of Chemistry, Physical Chemistry, Lund University, Lund, Sweden. .,NanoLund, Lund University, Lund (Sweden, Lund Institute of Advanced Neutron and X-Ray Science - LINXS), Lund, Sweden
| | - Costanza Montis
- Department of Chemistry, University of Florence and CSGI, Florence, Italy.
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6
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Π-GISANS: probing lateral structures with a fan shaped beam. Sci Rep 2021; 11:17786. [PMID: 34493764 PMCID: PMC8423805 DOI: 10.1038/s41598-021-97112-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 08/20/2021] [Indexed: 11/27/2022] Open
Abstract
We have performed grazing incidence neutron small angle scattering using a fan shaped incident beam focused along one dimension. This allows significantly reduced counting times for measurements of lateral correlations parallel to an interface or in a thin film where limited depth resolution is required. We resolve the structure factor of iron inclusions in aluminium oxide and show that the ordering of silica particles deposited on a silicon substrate depends on their size. We report hexagonal packing for 50 nm but not for 200 nm silica spheres deposited by a modified Langmuir-Schaefer method on a silicon substrate. For the 200 nm particles we extract the particles shape from the form factor. Moreover, we report dense packing of the particles spread on a free water surface. We name this method π-GISANS to highlight that it differs from GISANS as it gives lateral information while averaging the in-depth structure.
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7
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Hafner A, Gutfreund P, Toperverg BP, Geoghegan M, Sferrazza M. 2D reflectometry for the investigation of polymer interfaces: off-specular neutron scattering. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:364002. [PMID: 34253693 DOI: 10.1088/1361-648x/ac0282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 05/18/2021] [Indexed: 06/13/2023]
Abstract
Specular and off-specular neutron reflectometry have been used in a combined approach to study thin polymer films. Our goal in this work is to illustrate the power of the off-specular scattering technique to probe the properties of the buried interface of immiscible polymer bilayers of deuterated polystyrene and protonated poly(methyl methacrylate) (h-PMMA). The diffuse scattering stemming from these systems is discussed in relation to thermal fluctuations at the polymer/polymer interface, providing a means to extract in-plane correlation lengths from buried interfaces. In addition the onset of hole formation in the top layer is evidenced by the diffuse scattering, not easily detectable by specular reflection alone.
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Affiliation(s)
- Aljoša Hafner
- Institut Laue - Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble, Cedex 9, France
- Université Libre de Bruxelles, Département de Physique, 1050 Brussels, Belgium
| | - Philipp Gutfreund
- Institut Laue - Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble, Cedex 9, France
| | - Boris P Toperverg
- Institut Laue - Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble, Cedex 9, France
- Petersburg Nuclear Physics Institute, National Research Center 'Kurchatov Institute',188300 Gatchina, Russia
| | - Mark Geoghegan
- Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom
| | - Michele Sferrazza
- Université Libre de Bruxelles, Département de Physique, 1050 Brussels, Belgium
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