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George M, Nallet F, Fabre P. A threshold model of plastic waste fragmentation: New insights into the distribution of microplastics in the ocean and its evolution over time. Mar Pollut Bull 2024; 199:116012. [PMID: 38232651 DOI: 10.1016/j.marpolbul.2023.116012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 12/26/2023] [Accepted: 12/27/2023] [Indexed: 01/19/2024]
Abstract
Plastic pollution in the aquatic environment has been assessed for many years by ocean waste collection expeditions around the globe or by river sampling. While the total amount of plastic produced worldwide is well documented, the amount of plastic found in the ocean, the distribution of particles on its surface and its evolution over time are still the subject of much debate. In this article, we propose a general fragmentation model, postulating the existence of a critical size below which particle fragmentation becomes extremely unlikely. In the frame of this model, an abundance peak appears for sizes around 1 mm, in agreement with real environmental data. Using, in addition, a realistic exponential waste feed to the ocean, we discuss the relative impact of fragmentation and feed rates, and the temporal evolution of microplastics (MP) distribution. New conclusions on the temporal trend of MP pollution are drawn.
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Affiliation(s)
- Matthieu George
- Laboratoire Charles-Coulomb, UMR 5221 CNRS, Université de Montpellier, Campus Triolet, Place Eugène-Bataillon - CC069, F-34095, Montpellier Cedex 5, France
| | - Frédéric Nallet
- Centre de recherche Paul-Pascal, UMR 5031 CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600 Pessac, France
| | - Pascale Fabre
- Laboratoire Charles-Coulomb, UMR 5221 CNRS, Université de Montpellier, Campus Triolet, Place Eugène-Bataillon - CC069, F-34095, Montpellier Cedex 5, France.
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2
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Layan E, Gupta J, Ly I, Nallet F, Bentaleb A, Laurichesse E, Vallée R, Blin JL, Lebeau B, Louërat F, Le Bechec M, Moonen P, Toupance T, Pigot T, Backov R. TiO 2-SiO 2 Self-Standing Materials bearing Hierarchical Porosity: MUB-200(x) Series toward 3D-Efficient VOC Photoabatement Properties. Langmuir 2023; 39:3871-3882. [PMID: 36878006 DOI: 10.1021/acs.langmuir.2c03062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Three-dimensional photoactive self-standing porous materials have been synthesized through the integration of soft chemistry and colloids (emulsions, lyotrope mesophases, and P25 titania nanoparticles). Final multiscale porous ceramics bear 700-1000 m2 g-1 of micromesoporosity depending on the P25 nanoparticle contents. The applied thermal treatment does not affect the P25 anatase/rutile allotropic phase ratio. Photonic investigations correlated with the foams' morphologies suggest that the larger amount of TiO2 that is introduced, the larger the walls' density and the smaller the mean size of the void macroscopic diameters, with both effects inducing a reduction of the photon transport mean free path (lt) with the P25 content increase. A light penetration depth in the range of 6 mm is reached, thus depicting real 3D photonic scavenger behavior. The 3D photocatalytic properties of the MUB-200(x) series, studied in a dynamic "flow-through" configuration, show that the highest photoactivity (concentration of acetone ablated and concentration of CO2 formed) is obtained with the highest monolith height (volume) while providing an average of 75% mineralization. These experimental results validate the fact that these materials, bearing 3D photoactivity, are paving the path for air purification operating with self-standing porous monolith-type materials, which are much easier to handle than powders. As such, the photocatalytic systems can now be advantageously miniaturized, thereby offering indoor air treatment within vehicles/homes while drastically limiting the associated encumbrance. This volumetric counterintuitive acting mode for light-induced reactions may find other relevant advanced applications for photoinduced water splitting, solar fuel, and dye-sensitized solar cells while both optimizing photon scavenging and opening the path for the miniaturization of the processes where encumbrance or a foot-print penalty would be advantageously circumvented.
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Affiliation(s)
- Elodie Layan
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Juhi Gupta
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Isabelle Ly
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Frédéric Nallet
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Ahmed Bentaleb
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Eric Laurichesse
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Renaud Vallée
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Jean-Luc Blin
- Institut Jean Barriol, UMR CNRS 7053 L2CM, Université de Lorraine, Faculté des Sciences et Technologies, BP 70239, 54506 Vandoeuvre lès Nancy cedex, France
| | - Bénédicte Lebeau
- CNRS - Institut de Science des Matériaux de Mulhouse (IS2M), 15 rue Jean Starcky - BP 2488, 68057 Mulhouse cedex, France
| | - Frédéric Louërat
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
| | - Mickael Le Bechec
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IMT Mines Ales, IPREM, 64000 Pau, France
| | - Peter Moonen
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, Total, LFCR, 64000 Pau, France
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, DMEX, 64000 Pau, France
| | - Thierry Toupance
- Université de Bordeaux, Institut des Sciences Moléculaires CNRS UMR 5255, Bât. A12, 351 Cours de la Libération, 33405 Talence cedex, France
| | - Thierry Pigot
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IMT Mines Ales, IPREM, 64000 Pau, France
| | - Rénal Backov
- Université de Bordeaux, CRPP-UMR CNRS 5031, 115 Avenue Albert Schweitzer, 33600 Pessac, France
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Demisli S, Galani E, Goulielmaki M, Kyrilis FL, Ilić T, Hamdi F, Crevar M, Kastritis PL, Pletsa V, Nallet F, Savić S, Xenakis A, Papadimitriou V. Encapsulation of cannabidiol in oil-in-water nanoemulsions and nanoemulsion-filled hydrogels: A structure and biological assessment study. J Colloid Interface Sci 2023; 634:300-313. [PMID: 36535166 DOI: 10.1016/j.jcis.2022.12.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022]
Abstract
HYPOTHESIS Lipophilic cannabidiol can be solubilized in oil-in water nanoemulsions, which can then be impregnated into chitosan hydrogels forming another colloidal system that will facilitate cannabidiol's release. The delivery from both systems was compared, alongside structural and biological studies, to clarify the effect of the two carriers' structure on the release and toxicity of the systems. EXPERIMENTS Oil-in-water nanoemulsions (NEs) and the respective nanoemulsion-filled chitosan hydrogels (NE/HGs) were formulated as carriers of cannabidiol (CBD). Size, polydispersity and stability of the NEs were evaluated and then membrane dynamics, shape and structure of both systems were investigated with EPR spin probing, SAXS and microscopy. Biocompatibility of the colloidal delivery systems was evaluated through cytotoxicity tests over normal human skin fibroblasts. An ex vivo permeation protocol using porcine ear skin was implemented to assess the release of CBD and its penetration through the skin. FINDINGS Incorporation of the NEs in chitosan hydrogels does not significantly affect their structural properties as evidenced through SAXS, EPR and confocal microscopy. These findings indicate the successful development of a novel nanocarrier that preserves the NE structure with the CBD remaining encapsulated in the oil core while providing new rheological properties advantageous over NEs. Moreover, NE/HGs proved to be more efficient as a carrier for the release of CBD. Cell viability assessment revealed high biocompatibility of the proposed colloids.
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Affiliation(s)
- Sotiria Demisli
- Institute of Chemical Biology, National Hellenic Research Foundation, Athens, Greece; Department of Biochemistry & Biotechnology, University of Thessaly, Larissa, Greece
| | - Eleni Galani
- Institute of Chemical Biology, National Hellenic Research Foundation, Athens, Greece; Department of Food Science & Human Nutrition, Agricultural University of Athens, Greece
| | - Maria Goulielmaki
- Institute of Chemical Biology, National Hellenic Research Foundation, Athens, Greece
| | - Fotios L Kyrilis
- Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Tanja Ilić
- Department of Pharmaceutical Technology and Cosmetology, University of Belgrade, Belgrade, Serbia
| | - Farzad Hamdi
- Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Milkica Crevar
- Department of Pharmaceutical Technology and Cosmetology, University of Belgrade, Belgrade, Serbia
| | | | - Vasiliki Pletsa
- Institute of Chemical Biology, National Hellenic Research Foundation, Athens, Greece
| | - Frédéric Nallet
- Centre de Recherche Paul Pascal (CRPP) UMR 5031 CNRS, University of Bordeaux, France
| | - Snežana Savić
- Department of Pharmaceutical Technology and Cosmetology, University of Belgrade, Belgrade, Serbia
| | - Aristotelis Xenakis
- Institute of Chemical Biology, National Hellenic Research Foundation, Athens, Greece
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Chatzidaki MD, Demisli S, Zingkou E, Liggri PG, Papachristos DP, Balatsos G, Karras V, Nallet F, Michaelakis A, Sotiropoulou G, Zographos SE, Papadimitriou V. Essential oil-in-water microemulsions for topical application: structural study, cytotoxic effect and insect repelling activity. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Vassiliadi E, Tsirigotis-Maniecka M, Symons HE, Gobbo P, Nallet F, Xenakis A, Zoumpanioti M. (Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization-Part ΙΙ: Structural Studies. Gels 2022; 8:gels8090595. [PMID: 36135307 PMCID: PMC9498736 DOI: 10.3390/gels8090595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/02/2022] [Accepted: 09/13/2022] [Indexed: 12/01/2022] Open
Abstract
The present work reports on the structural study of a film made of a hybrid blend of biopolymers used as an enzyme carrier. A cellulose derivative (HPMC) and chitosan (CS) were combined in order to formulate a film on which Mucor miehei lipase was immobilized. The film was successfully used as a biocatalyst; however, little is known about the structure of the system. Therefore, small-angle X-ray scattering, Fourier transform infrared spectroscopy (FTIR), optical microscopy, and scanning electron microscopy (SEM), as well as microindentation measurements, were used to shed light on the structure of the promising biocatalyst. Among the results, intermolecular hydrogen bonds were observed between the amide groups of the two polymers and the lipase. The presence of the enzyme does not seem to affect the mechanical properties of the matrix. The used film after 35 cycles of reaction seemed to be fatigued and had lost part of its humidity, explaining the reduction of the enzyme activity.
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Affiliation(s)
- Evdokia Vassiliadi
- Institute of Chemical Biology, National Hellenic Research Foundation (NHRF), 48 Vassileos Constantinou Ave., 11635 Athens, Greece
- Department of Biological Applications and Technology, University of Ioannina, 45110 Ioannina, Greece
| | | | - Henry E. Symons
- School of Chemistry, University of Bristol, Bristol BS8 1TS, UK
| | - Pierangelo Gobbo
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, 34127 Trieste, Italy
| | - Frédéric Nallet
- Centre de Recherche Paul-Pascal, University Bordeaux, CNRS, UMR 5031, 115 Avenue du Docteur-Schweitzer, 33600 Pessac, France
| | - Aristotelis Xenakis
- Institute of Chemical Biology, National Hellenic Research Foundation (NHRF), 48 Vassileos Constantinou Ave., 11635 Athens, Greece
| | - Maria Zoumpanioti
- Institute of Chemical Biology, National Hellenic Research Foundation (NHRF), 48 Vassileos Constantinou Ave., 11635 Athens, Greece
- Correspondence: ; Tel.: +302-107-273-796
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Coudon N, Navailles L, Nallet F, Ly I, Bentaleb A, Chapel JP, Béven L, Douliez JP, Martin N. Stabilization of all-aqueous droplets by interfacial self-assembly of fatty acids bilayers. J Colloid Interface Sci 2022; 617:257-266. [DOI: 10.1016/j.jcis.2022.02.138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 02/14/2022] [Accepted: 02/28/2022] [Indexed: 11/15/2022]
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Ly I, Layan E, Picheau E, Chanut N, Nallet F, Bentaleb A, Dourges MA, Pellenq RJ, Hillard EA, Toupance T, Dole F, Louërat F, Backov R. Design of Binary Nb 2O 5-SiO 2 Self-Standing Monoliths Bearing Hierarchical Porosity and Their Efficient Friedel-Crafts Alkylation/Acylation Catalytic Properties. ACS Appl Mater Interfaces 2022; 14:13305-13316. [PMID: 35258941 DOI: 10.1021/acsami.1c24554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Alkylation of aromatic hydrocarbons is among the most industrially important reactions, employing acid catalysts such as AlCl3, H2SO4, HF, or H3PO4. However, these catalysts present severe drawbacks, such as low selectivity and high corrosiveness. Taking advantage of the intrinsic high acid strength and Lewis and Brønsted acidity of niobium oxide, we have designed the first series of Nb2O5-SiO2(HIPE) monolithic catalysts bearing multiscale porosity through the integration of a sol-gel process and the physical chemistry of complex fluids. The MUB-105 series offers efficient solvent-free heterogeneous catalysis toward Friedel-Crafts monoalkylation and -acylation reactions, where 100% conversion has been reached at 140 °C while cycling. Alkylation reactions employing the MUB-105(1) catalyst have a maximum turnover number (TON) of 104 and a turnover frequency (TOF) of 9 h-1, whereas for acylation, MUB-105(1) and MUB-105(2) yield maximum TON and TOF values of 107 and 11 h-1, respectively. Moreover, the catalysts are selective, producing equal amounts of ortho- and para-substituted alkylated products and greater than 90% of the para-substituted acylated product. The highest catalytic efficiencies are obtained for the MUB-105(1) catalyst, bearing the smallest Nb2O5 particle sizes, lowest Nb2O5 content, and the highest amorphous character. The catalysts presented here are in a monolithic self-standing state, offering easy handling, reusability, and separation from the final products.
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Affiliation(s)
- Isabelle Ly
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
| | - Elodie Layan
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
| | - Emmanuel Picheau
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
| | - Nicolas Chanut
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, MIT Energy Initiative, 77 Massachussets Avenue, Cambridge, Massachusetts 02139, United States
| | - Frédéric Nallet
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
| | - Ahmed Bentaleb
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
| | - Marie-Anne Dourges
- CNRS, Bordeaux INP, ISM, UMR 5255, Université de Bordeaux, 351 Cours de la Libération, Talence Cedex F-33405, France
| | - Roland J Pellenq
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, MIT Energy Initiative, 77 Massachussets Avenue, Cambridge, Massachusetts 02139, United States
| | - Elizabeth A Hillard
- ICMCB-UMR CNRS 5026, Université de Bordeaux, 87 Avenue Albert Schweitzer, Pessac Cedex 33608, France
| | - Thierry Toupance
- CNRS, Bordeaux INP, ISM, UMR 5255, Université de Bordeaux, 351 Cours de la Libération, Talence Cedex F-33405, France
| | - François Dole
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
| | - Frédéric Louërat
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
| | - Rénal Backov
- CRPP-UMR CNRS 5031, Université de Bordeaux, 115 Avenue Albert Schweitzer, Pessac 33600, France
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Mitsou E, Theochari I, Vassiliadi E, Nallet F, Xenakis A. Short-wave and near infrared π-conjugated polymers hosted in a biocompatible microemulsion: a pioneering approach for photoacoustic contrast agents. J Mater Chem B 2022; 10:2680-2690. [PMID: 35079759 DOI: 10.1039/d1tb02257a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present study a biocompatible oil-in-water (O/W) microemulsion was developed carrying short-wave infrared (SWIR) π-conjugated polymers and possessing photoacoustic properties for the first time. SWIR and NIR absorbing conjugated polymers were accomplished to be dissolved in a Food & Drug Administration (FDA) approved natural oil limonene, to formulate an O/W microemulsion using biocompatible surfactants (Span80, Labrasol®). Detailed structural characterization in the absence and presence of the polymers was performed by means of dynamic light scattering (DLS), small-angle X-ray scattering (SAXS) and electron paramagnetic resonance (EPR) spectroscopy. In terms of biological evaluation of the loaded microemulsions, inhibition of cell proliferation in various cancer cell lines without exhibiting significant cytotoxicity was tested through the MTT assay. The developed π-conjugated polymers hosted in O/W microemulsions represent a technological approach with a wide range of biomedical and bioelectronic applications and in this contribution, their photoacoustic properties are presented as a proof-of-concept.
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Affiliation(s)
- Evgenia Mitsou
- Institute of Chemical Biology, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens, 11635, Greece.
| | - Ioanna Theochari
- Institute of Chemical Biology, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens, 11635, Greece.
| | - Evdokia Vassiliadi
- Institute of Chemical Biology, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens, 11635, Greece. .,Biotechnology Laboratory, Department of Biological Applications and Technologies, University of Ioannina, 45110 Ioannina, Greece
| | - Frédéric Nallet
- Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, 33600 Pessac, France
| | - Aristotelis Xenakis
- Institute of Chemical Biology, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens, 11635, Greece.
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9
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Alvarez-Fernandez A, Nallet F, Fontaine P, Cummins C, Hadziioannou G, Barois P, Fleury G, Ponsinet V. Large area Al 2O 3-Au raspberry-like nanoclusters from iterative block-copolymer self-assembly. RSC Adv 2020; 10:41088-41097. [PMID: 35519210 PMCID: PMC9057902 DOI: 10.1039/d0ra08730k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 10/28/2020] [Indexed: 12/12/2022] Open
Abstract
In the field of functional nanomaterials, core–satellite nanoclusters have recently elicited great interest due to their unique optoelectronic properties. However, core–satellite synthetic routes to date are hampered by delicate and multistep reaction conditions and no practical method has been reported for the ordering of these structures onto a surface monolayer. Herein we show a reproducible and simplified thin film process to fabricate bimetallic raspberry nanoclusters using block copolymer (BCP) lithography. The fabricated inorganic raspberry nanoclusters consisted of a ∼36 nm alumina core decorated with ∼15 nm Au satellites after infusing multilayer BCP nanopatterns. A series of cylindrical BCPs with different molecular weights allowed us to dial in specific nanodot periodicities (from 30 to 80 nm). Highly ordered BCP nanopatterns were then selectively infiltrated with alumina and Au species to develop multi-level bimetallic raspberry features. Microscopy and X-ray reflectivity analysis were used at each fabrication step to gain further mechanistic insights and understand the infiltration process. Furthermore, grazing-incidence small-angle X-ray scattering studies of infiltrated films confirmed the excellent order and vertical orientation over wafer scale areas of Al2O3/Au raspberry nanoclusters. We believe our work demonstrates a robust strategy towards designing hybrid nanoclusters since BCP blocks can be infiltrated with various low cost salt-based precursors. The highly controlled nanocluster strategy disclosed here could have wide ranging uses, in particular for metasurface and optical based sensor applications. Large area Al2O3–Au raspberry-like nanoclusters and other complex structures have been created by iterative block-copolymer self-assembly, paving the way to a new generation of on-demand metallic architectures.![]()
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Affiliation(s)
- Alberto Alvarez-Fernandez
- CNRS, Univ. Bordeaux, Centre de Recherche Paul Pascal, UMR 5031 115 Avenue Schweitzer 33600 Pessac France.,CNRS, Univ. Bordeaux, Bordeaux INP, LCPO, UMR 5629 F-33600 Pessac France .,Department of Chemical Engineering, University College London Torrington Place London WC1E 7JE UK
| | - Frédéric Nallet
- CNRS, Univ. Bordeaux, Centre de Recherche Paul Pascal, UMR 5031 115 Avenue Schweitzer 33600 Pessac France
| | - Philippe Fontaine
- Synchrotron SOLEIL L'Orme des Merisiers, Saint-Aubin-BP 48 F-91192 Gif-sur Yvette Cedex France
| | - Cian Cummins
- CNRS, Univ. Bordeaux, Centre de Recherche Paul Pascal, UMR 5031 115 Avenue Schweitzer 33600 Pessac France.,CNRS, Univ. Bordeaux, Bordeaux INP, LCPO, UMR 5629 F-33600 Pessac France
| | | | - Philippe Barois
- CNRS, Univ. Bordeaux, Centre de Recherche Paul Pascal, UMR 5031 115 Avenue Schweitzer 33600 Pessac France
| | - Guillaume Fleury
- CNRS, Univ. Bordeaux, Bordeaux INP, LCPO, UMR 5629 F-33600 Pessac France
| | - Virginie Ponsinet
- CNRS, Univ. Bordeaux, Centre de Recherche Paul Pascal, UMR 5031 115 Avenue Schweitzer 33600 Pessac France
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10
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Gaillard T, George M, Gastaldi E, Nallet F, Fabre P. An experimental and theoretical study of the erosion of semi-crystalline polymers and the subsequent generation of microparticles. Soft Matter 2019; 15:8302-8312. [PMID: 31549700 DOI: 10.1039/c9sm01482a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The increase of plastics and microplastics in the environment is a major environmental challenge. Still, little is known about the degradation kinetics of macroplastics into smaller particles, under the joint actions of micro-organisms and physico-chemical factors, like UV or mechanical constraints. In order to gain insight into (bio)-degradation in various media, we perform accelerated erosion experiments by using a well-known enzymatic system. We show that the microstructure of semi-crystalline polymers plays a crucial role in the pattern formation at their surface. For the first time, the release of fragments of micrometric size is evidenced, through a mechanism that does not involve fracture propagation. A geometric erosion model allows a quantitative understanding of erosion rates and surface patterns, and provides a critical heterogeneity size, parting two types of behavior: spherulites either released, or eroded in situ. This new geometric approach could constitute a useful tool to predict the erosion kinetics and micro-particle generation in various media.
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Affiliation(s)
- Thibaut Gaillard
- Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, Montpellier, France.
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11
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Leite Rubim R, Abrantes Barros M, Missègue T, Bougis K, Navailles L, Nallet F. Highly confined stacks of graphene oxide sheets in water. Eur Phys J E Soft Matter 2018; 41:30. [PMID: 29546498 DOI: 10.1140/epje/i2018-11636-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 02/21/2018] [Indexed: 06/08/2023]
Abstract
Since the discovery of graphene oxide (GO), the most accessible of the precursors of graphene, this material has been widely studied for applications in science and technology. In this work, we describe a procedure to obtain GO dispersions in water at high concentrations, these highly dehydrated dispersions being in addition fully redispersible by dilution. With the availability of such concentrated samples, it was possible to investigate the structure of hydrated GO sheets in a previously unexplored range of concentrations, and to evidence a structural phase transition. Tentatively applying models designed for describing the small-angle scattering curve in the Smectic A (or [Formula: see text]) phase of lyotropic systems, it was possible to extract elastic parameters characterising the system on the dilute side of the transition, thereby evidencing the relevance of both electrostatic and steric (Helfrich) interactions in stabilising aqueous lamellar stacks of GO sheets.
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Affiliation(s)
- Rafael Leite Rubim
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
| | - Margarida Abrantes Barros
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
- Técnico Lisboa, Av. Rovisco Pais, 1, PT-1049-001, Lisboa, Portugal
| | - Thomas Missègue
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
| | - Kévin Bougis
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
| | - Laurence Navailles
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
| | - Frédéric Nallet
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France.
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12
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Jäger A, Jäger E, Giacomelli FC, Nallet F, Steinhart M, Putaux JL, Konefał R, Spěváček J, Ulbrich K, Štěpánek P. Structural changes on polymeric nanoparticles induced by hydrophobic drug entrapment. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.059] [Citation(s) in RCA: 8] [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: 12/20/2022]
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13
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Nallet F. Surfactant films in lyotropic lamellar (and related) phases: Fluctuations and interactions. Adv Colloid Interface Sci 2017; 247:363-373. [PMID: 28732556 DOI: 10.1016/j.cis.2017.06.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 06/21/2017] [Indexed: 10/19/2022]
Abstract
The analogy between soap films thinning under border capillary suction and lamellar stacks of surfactant bilayers dehydrated by osmotic stress is explored, in particular in the highly dehydrated limit where the soap film becomes a Newton black film. The nature of short-range repulsive interactions between surfactant-covered interfaces and acting across water channels in both cases will be discussed.
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14
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Nallet F. Scattering studies in self-organised diblock copolymer systems. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4082-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Nyame Mendendy Boussambe G, Valentin R, Fabre JF, Navailles L, Nallet F, Gaillard C, Mouloungui Z. Self-Assembling Behavior of Glycerol Monoundecenoate in Water. Langmuir 2017; 33:3223-3233. [PMID: 28291357 DOI: 10.1021/acs.langmuir.6b03584] [Citation(s) in RCA: 4] [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] [Indexed: 06/06/2023]
Abstract
The self-assembling properties of glycerol esters in water are well known. Still, few data on glycerol monoesters of undecylenic acid are available. The aim of this study was to highlight the behavior of glycerol monoundecenoate (GM-C11:1) in different diluted and concentrated states. Its self-assembling properties in water and upon solid inorganic surfaces were investigated in the diluted state using surface tension experiments, atomic force microscopy, and cryogenic transmission electron microscopy studies. In the concentrated state, the gelling properties in the presence of water were investigated using polarized light microscopy, differential scanning calorimetry (DSC), and small-angle X-ray scattering (SAXS) experiments. GM-C11:1 at 100 mg/L self-assembles at the liquid/air interfaces as aggregates of approximately 20 nm in diameter, organized into concentric forms. These aggregates are spherical globules composed of several molecules of GM-C11:1. At higher concentrations (1000 and 104 mg/L), GM-C11:1 is able to uniformly coat liquid/air and liquid/solid interfaces. In bulk, GM-C11:1 forms spontaneously aggregates and vesicles. In a more concentrated state, GM-C11:1 assembles into lamellar Lβ and Lα forms in water. By cross-referencing SAXS and DSC findings, we were able to distinguish between interlamellar water molecules strongly bound to GM-C11:1 and other molecules remaining unbound and considered to be "mobile" water. The percentage of water strongly bound was proportional to the percentage of GM-C11:1 in the system. In this case, GM-C11:1 appears to be an effective molecule for surface treatments for which water retention is important.
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Affiliation(s)
| | - Romain Valentin
- Laboratoire de Chimie Agro-Industrielle (LCA), Université de Toulouse, INRA, INPT , 31030 Toulouse, France
| | - Jean-François Fabre
- Laboratoire de Chimie Agro-Industrielle (LCA), Université de Toulouse, INRA, INPT , 31030 Toulouse, France
| | - Laurence Navailles
- Centre de Recherche Paul-Pascal, CNRS, Université de Bordeaux , 33600 Pessac, France
| | - Frédéric Nallet
- Centre de Recherche Paul-Pascal, CNRS, Université de Bordeaux , 33600 Pessac, France
| | - Cédric Gaillard
- UR 1268 Biopolymères Interactions et Assemblages, INRA , rue de la Géraudière, 44316 Nantes, France
| | - Zéphirin Mouloungui
- Laboratoire de Chimie Agro-Industrielle (LCA), Université de Toulouse, INRA, INPT , 31030 Toulouse, France
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16
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Poulin P, Jalili R, Neri W, Nallet F, Divoux T, Colin A, Aboutalebi SH, Wallace G, Zakri C. Superflexibility of graphene oxide. Proc Natl Acad Sci U S A 2016; 113:11088-11093. [PMID: 27647890 PMCID: PMC5056031 DOI: 10.1073/pnas.1605121113] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Graphene oxide (GO), the main precursor of graphene-based materials made by solution processing, is known to be very stiff. Indeed, it has a Young's modulus comparable to steel, on the order of 300 GPa. Despite its very high stiffness, we show here that GO is superflexible. We quantitatively measure the GO bending rigidity by characterizing the flattening of thermal undulations in response to shear forces in solution. Characterizations are performed by the combination of synchrotron X-ray diffraction at small angles and in situ rheology (rheo-SAXS) experiments using the high X-ray flux of a synchrotron source. The bending modulus is found to be 1 kT, which is about two orders of magnitude lower than the bending rigidity of neat graphene. This superflexibility compares with the fluidity of self-assembled liquid bilayers. This behavior is discussed by considering the mechanisms at play in bending and stretching deformations of atomic monolayers. The superflexibility of GO is a unique feature to develop bendable electronics after reduction, films, coatings, and fibers. This unique combination of properties of GO allows for flexibility in processing and fabrication coupled with a robustness in the fabricated structure.
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Affiliation(s)
- Philippe Poulin
- Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, 33600 Pessac, France
| | - Rouhollah Jalili
- Australian Research Council Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Australian Institute of Innovative Materials Facility, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Wilfrid Neri
- Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, 33600 Pessac, France
| | - Frédéric Nallet
- Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, 33600 Pessac, France
| | - Thibaut Divoux
- Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, 33600 Pessac, France
| | - Annie Colin
- Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, 33600 Pessac, France
| | - Seyed Hamed Aboutalebi
- Condensed Matter National Laboratory, Institute for Research in Fundamental Sciences, 19395-5531, Tehran, Iran
| | - Gordon Wallace
- Australian Research Council Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, Australian Institute of Innovative Materials Facility, Innovation Campus, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Cécile Zakri
- Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, 33600 Pessac, France;
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17
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Garenne D, Beven L, Navailles L, Nallet F, Dufourc EJ, Douliez JP. Sequestration of Proteins by Fatty Acid Coacervates for Their Encapsulation within Vesicles. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607117] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- David Garenne
- UMR 1332; biologie et pathologie du fruit, INRA; centre de Bordeaux 33883 Villenave O'Ornon France
| | - Laure Beven
- UMR 1332; biologie et pathologie du fruit, INRA; centre de Bordeaux 33883 Villenave O'Ornon France
| | - Laurence Navailles
- Université de Bordeaux; Centre de Recherche Paul-Pascal, CNRS; av. A. Schweitzer 33600 Pessac France
| | - Frédéric Nallet
- Université de Bordeaux; Centre de Recherche Paul-Pascal, CNRS; av. A. Schweitzer 33600 Pessac France
| | - Erick J. Dufourc
- Institute of Chemistry and Biology of Membranes and Nano-objects, UMR 5248, CNRS; université de Bordeaux; Institut polytechnique Bordeaux; 33600 Pessac France
| | - Jean-Paul Douliez
- UMR 1332; biologie et pathologie du fruit, INRA; centre de Bordeaux 33883 Villenave O'Ornon France
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18
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Garenne D, Beven L, Navailles L, Nallet F, Dufourc EJ, Douliez JP. Sequestration of Proteins by Fatty Acid Coacervates for Their Encapsulation within Vesicles. Angew Chem Int Ed Engl 2016; 55:13475-13479. [PMID: 27659782 DOI: 10.1002/anie.201607117] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Indexed: 11/11/2022]
Abstract
Encapsulating biological materials in lipid vesicles is of interest for mimicking cells; however, except in some particular cases, such processes do not occur spontaneously. Herein, we developed a simple and robust method for encapsulating proteins in fatty acid vesicles in high yields. Fatty acid based, membrane-free coacervates spontaneously sequester proteins and can reversibly form membranous vesicles upon varying the pH value, the precrowding feature in coacervates allowing for protein encapsulation within vesicles. We then produced enzyme-enriched vesicles and show that enzymatic reactions can occur in these micrometric capsules. This work could be of interest in the field of synthetic biology for building microreactors.
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Affiliation(s)
- David Garenne
- UMR 1332, biologie et pathologie du fruit, INRA, centre de Bordeaux, 33883, Villenave O'Ornon, France
| | - Laure Beven
- UMR 1332, biologie et pathologie du fruit, INRA, centre de Bordeaux, 33883, Villenave O'Ornon, France
| | - Laurence Navailles
- Université de Bordeaux, Centre de Recherche Paul-Pascal, CNRS, av. A. Schweitzer, 33600, Pessac, France
| | - Frédéric Nallet
- Université de Bordeaux, Centre de Recherche Paul-Pascal, CNRS, av. A. Schweitzer, 33600, Pessac, France
| | - Erick J Dufourc
- Institute of Chemistry and Biology of Membranes and Nano-objects, UMR 5248, CNRS, université de Bordeaux, Institut polytechnique Bordeaux, 33600, Pessac, France
| | - Jean-Paul Douliez
- UMR 1332, biologie et pathologie du fruit, INRA, centre de Bordeaux, 33883, Villenave O'Ornon, France.
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19
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Douliez JP, Houssou BH, Fameau AL, Navailles L, Nallet F, Grélard A, Dufourc EJ, Gaillard C. Self-Assembly of Bilayer Vesicles Made of Saturated Long Chain Fatty Acids. Langmuir 2016; 32:401-410. [PMID: 26700689 DOI: 10.1021/acs.langmuir.5b03627] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Saturated long chain fatty acids (sLCFA, e.g., C14:0, C16:0, and C18:0) are potentially the greenest and cheapest surfactants naturally available. However, because aqueous sodium soaps of sLCFA are known to crystallize, the self-assembly of stable bilayer vesicles has not been reported yet. Here, by using such soaps in combination with guanidine hydrochloride (GuHCl), which has been shown recently to prevent crystallization, we were capable of producing stable bilayer vesicles made of sLCFA. The phase diagrams were established for a variety of systems showing that vesicles can form in a broad range of composition and pH. Both solid state NMR and small-angle neutron scattering allowed demonstrating that in such vesicles sLCFA are arranged in a bilayer structure which exhibits similar dynamic and structural properties as those of phospholipid membranes. We expect these vesicles to be of interest as model systems of protocells and minimal cells but also for various applications since fatty acids are potentially substitutes to phospholipids, synthetic surfactants, and polymers.
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Affiliation(s)
- Jean-Paul Douliez
- UMR 1332, biologie et pathologie du fruit, INRA , centre de Bordeaux, 33883 Villenave d'Ornon, France
| | | | - A-Laure Fameau
- UR 1268 Biopolymères Interactions et Assemblages, INRA , rue de la Géraudière, 44316 Nantes, France
| | | | | | | | | | - Cédric Gaillard
- UR 1268 Biopolymères Interactions et Assemblages, INRA , rue de la Géraudière, 44316 Nantes, France
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20
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Leite Rubim R, Gerbelli BB, Bougis K, Pinto de Oliveira CL, Navailles L, Nallet F, Andreoli de Oliveira E. Water activity in lamellar stacks of lipid bilayers: "Hydration forces" revisited. Eur Phys J E Soft Matter 2016; 39:3. [PMID: 26794503 DOI: 10.1140/epje/i2016-16003-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 12/24/2015] [Indexed: 06/05/2023]
Abstract
Water activity and its relationship with interactions stabilising lamellar stacks of mixed lipid bilayers in their fluid state are investigated by means of osmotic pressure measurements coupled with small-angle X-ray scattering. The (electrically neutral) bilayers are composed of a mixture in various proportions of lecithin, a zwitterionic phospholipid, and Simulsol, a non-ionic cosurfactant with an ethoxylated polar head. For highly dehydrated samples the osmotic pressure profile always exhibits the "classical" exponential decay as hydration increases but, depending on Simulsol to lecithin ratio, it becomes either of the "bound" or "unbound" types for more water-swollen systems. A simple thermodynamic model is used for interpreting the results without resorting to the celebrated but elusive "hydration forces".
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Affiliation(s)
- R Leite Rubim
- Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil
- Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
| | - B B Gerbelli
- Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil
| | - K Bougis
- Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil
- Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
| | - C L Pinto de Oliveira
- Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil
| | - L Navailles
- Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
| | - F Nallet
- Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France.
| | - E Andreoli de Oliveira
- Instituto de Física-GFCx, Universidade de São Paulo, P.O.B. 66318, SP 05314-970, São Paulo, Brazil
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21
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Bougis K, Leite Rubim R, Ziane N, Peyencet J, Bentaleb A, Février A, Oliveira CLP, Andreoli de Oliveira E, Navailles L, Nallet F. Stabilising lamellar stacks of lipid bilayers with soft confinement and steric effects. Eur Phys J E Soft Matter 2015; 38:78. [PMID: 26174430 DOI: 10.1140/epje/i2015-15078-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 04/17/2015] [Accepted: 06/19/2015] [Indexed: 06/04/2023]
Abstract
Structure and interactions stabilising the lamellar stack of mixed lipid bilayers in their fluid state are investigated by means of small-angle X-ray scattering. The (electrically neutral) bilayers are composed of a mixtures of lecithin, a zwitterionic phospholipid, and Simulsol, a non-ionic cosurfactant with an ethoxylated polar head. The soft confinement of the bilayer hydrophilic components is varied by changing hydration and bilayer composition, as well as the length of the cosurfactant polar head. Structural transitions are observed at low hydration, in the stacking order for the longer cosurfactant, and in the mixed bilayers for the shorter one. At higher hydration, the swelling of the lamellar stacks occurs with a significant, but continuous evolution in the mixed bilayer structure. The bilayer structural changes are discussed in analogy with the so-called "brush-to-mushroom" transition induced by lateral confinement, relevant for long linear polymers grafted onto rigid surfaces, taking also into account the role of vertical confinement.
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Affiliation(s)
- K Bougis
- Centre de recherche Paul-Pascal-CNRS, Université de Bordeaux, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
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22
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Jäger A, Jäger E, Surman F, Höcherl A, Angelov B, Ulbrich K, Drechsler M, Garamus VM, Rodriguez-Emmenegger C, Nallet F, Štěpánek P. Nanoparticles of the poly([N-(2-hydroxypropyl)]methacrylamide)-b-poly[2-(diisopropylamino)ethyl methacrylate] diblock copolymer for pH-triggered release of paclitaxel. Polym Chem 2015. [DOI: 10.1039/c5py00567a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The potential of self-assembled nanoparticles for in vitro cytostatic activity has been explored on cancer cells.
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23
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Furlan AL, Castets A, Nallet F, Pianet I, Grélard A, Dufourc EJ, Géan J. Red wine tannins fluidify and precipitate lipid liposomes and bicelles. A role for lipids in wine tasting? Langmuir 2014; 30:5518-26. [PMID: 24787144 DOI: 10.1021/la5005006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Sensory properties of red wine tannins are bound to complex interactions between saliva proteins, membranes taste receptors of the oral cavity, and lipids or proteins from the human diet. Whereas astringency has been widely studied in terms of tannin-saliva protein colloidal complexes, little is known about interactions between tannins and lipids and their implications in the taste of wine. This study deals with tannin-lipid interactions, by mimicking both oral cavity membranes by micrometric size liposomes and lipid droplets in food by nanometric isotropic bicelles. Deuterium and phosphorus solid-state NMR demonstrated the membrane hydrophobic core disordering promoted by catechin (C), epicatechin (EC), and epigallocatechin gallate (EGCG), the latter appearing more efficient. C and EGCG destabilize isotropic bicelles and convert them into an inverted hexagonal phase. Tannins are shown to be located at the membrane interface and stabilize the lamellar phases. These newly found properties point out the importance of lipids in the complex interactions that happen in the mouth during organoleptic feeling when ingesting tannins.
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Affiliation(s)
- Aurélien L Furlan
- Institute of Chemistry and Biology of Membranes and Nano-objects, UMR 5248, CNRS, University of Bordeaux , IPB, F-33600 Pessac, France
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24
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Douliez JP, Navailles L, Dufourc EJ, Nallet F. Fully deuterated magnetically oriented system based on fatty acid direct hexagonal phases. Langmuir 2014; 30:5075-5081. [PMID: 24758608 DOI: 10.1021/la500808q] [Citation(s) in RCA: 3] [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: 06/03/2023]
Abstract
There is strong demand in the field of NMR for simple oriented lipid supramolecular assemblies, the constituents of which can be fully deuterated, for specifically studying the structure of host protonated molecules (e.g., peptides, proteins...) in a lipid environment. Also, small-angle neutron scattering (SANS) in fully deuterated oriented systems is powerful for gaining information on protonated host molecules in a lipid environment by using the contrast proton/deuterium method. Here we report on a very simple system made of fatty acids (dodecanoic and tetradecanoic) and ethanolamine in water. All components of this system can be obtained commercially as perdeuterated. Depending on the molar ratio and the concentration, the system self-assembles at room temperature into a direct hexagonal phase that is oriented by moderate magnetic fields of a few tesla. The orientation occurs within the magnetic field upon cooling the system from its higher-temperature isotropic phase: the lipid cylinders of the hexagonal phase become oriented parallel to the field. This is shown by solid-state NMR using either perdeuterated fatty acids or ethanolamine. This system bears strong interest for studying host protonated molecules but also in materials chemistry for building oriented solid materials.
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Affiliation(s)
- Jean-Paul Douliez
- UMR 1332, Biologie et Pathologie du Fruit, INRA, Centre de Bordeaux, 33883 Villenave d'Ornon, France
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25
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Gerbelli BB, Rubim RL, Silva ER, Nallet F, Navailles L, Oliveira CLP, de Oliveira EA. Steric-induced effects on stabilizing a lamellar structure. Langmuir 2013; 29:13717-13722. [PMID: 24215580 DOI: 10.1021/la402962c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We investigate the behavior of multilamellar phases composed of lecithin and a commercial cosurfactant (Simusol), which is a mixture of ethoxylated fatty acids. Using X-ray scattering and a new procedure to fit the data, relevant parameters characterizing the lamellar structure were determined as a function of membrane composition, varying from 100% of lecithin to 100% of Simulsol. Scattering data illustrating the swelling of the lamellae for different amounts of cosurfactant are presented with the respective behavior of the Caillé parameter. With this experimental approach, we show that the incorporation of ethoxy brushes onto the lipid surface enhances repulsive interactions arising from membrane fluctuations and changes the interactions at the interface between bilayers.
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Affiliation(s)
- Barbara B Gerbelli
- Instituto de Física, Universidade de São Paulo , Caixa Postal 66318, 05314-970 São Paulo, Brazil
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26
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Tonelli G, Oumzil K, Nallet F, Gaillard C, Navailles L, Barthélémy P. Amino acid-nucleotide-lipids: effect of amino acid on the self-assembly properties. Langmuir 2013; 29:5547-5555. [PMID: 23565776 DOI: 10.1021/la400515m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Hybrid amphiphiles composed of a lipid covalently linked to biomolecules are attracting considerable attention, owing to their unique physicochemical and biological properties. Herein, we have synthesized novel amino acid-nucleotide-lipids (ANLs), presenting phenylalanine and thymidine residues and saturated or unsaturated diacyl glycerol lipid moieties to investigate the effect of the specific aminoacid moieties on both aggregation properties and interactions of ANLs with single strand polyA RNA. Physicochemical studies (DLS, cryo-TEM, and small angle X-ray scattering) indicate that phenylanaline amino acids inserted at the 5' position of the nucleotide-lipids stabilize multilamellar systems, whereas unilamellar vesicles are formed preferentially in the case of nucleotide-lipids (NLs). Both NLs and ANLs exhibit weak interactions with complementary polyA RNA as revealed by isothermal titration calorimetry investigations. The multilamellar vesicles obtained with ANLs could be used as a versatile carrier, suitable for both hydrophobic and hydrophilic therapeutic molecules.
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27
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Abstract
Simultaneous measurements of small-angle neutron scattering and dynamic light scattering have been performed on a binary mixture of partially miscible liquids, 2,6-dimethylpyridine and water. At critical composition the temperature dependence of the correlation length of fluctuations in composition is strongly affected by the addition of nanoparticles of a triblock copolymer polyethylene oxide-polypropylene oxide-polyethylene oxide. A crossover between Ising-type critical behavior and mean-field critical behavior is observed when the correlation length is equal to the size of the nanoparticles.
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Affiliation(s)
- Z Bakaeva
- Institute of Macromolecular Chemistry, Heyrovsky Sq. 2, 16206 Prague, Czech Republic.
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28
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Lin X, Navailles L, Nallet F, Grinstaff MW. Influence of Phosphonium Alkyl Substituents on the Rheological and Thermal Properties of Phosphonium-PAA-Based Supramolecular Polymeric Assemblies. Macromolecules 2012. [DOI: 10.1021/ma3019624] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [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)
- Xinrong Lin
- Departments of Biomedical Engineering
and Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215, United
States
| | - Laurence Navailles
- CNRS, CRPP, UPR
8641, F-33600
Pessac, France, Univ. Bordeaux, CRPP, UPR
8641, F-33600 Pessac, France
| | - Frédéric Nallet
- CNRS, CRPP, UPR
8641, F-33600
Pessac, France, Univ. Bordeaux, CRPP, UPR
8641, F-33600 Pessac, France
| | - Mark W. Grinstaff
- Departments of Biomedical Engineering
and Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, Massachusetts 02215, United
States
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29
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Oliveira CLP, Gerbelli BB, Silva ERT, Nallet F, Navailles L, Oliveira EA, Pedersen JS. Gaussian deconvolution: a useful method for a form-free modeling of scattering data from mono- and multilayered planar systems. J Appl Crystallogr 2012. [DOI: 10.1107/s002188981204191x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A new method for analysis of scattering data from lamellar bilayer systems is presented. The method employs a form-free description of the cross-section structure of the bilayer and the fit is performed directly to the scattering data, introducing also a structure factor when required. The cross-section structure (electron density profile in the case of X-ray scattering) is described by a set of Gaussian functions and the technique is termed Gaussian deconvolution. The coefficients of the Gaussians are optimized using a constrained least-squares routine that induces smoothness of the electron density profile. The optimization is coupled with the point-of-inflection method for determining the optimal weight of the smoothness. With the new approach, it is possible to optimize simultaneously the form factor, structure factor and several other parameters in the model. The applicability of this method is demonstrated by using it in a study of a multilamellar system composed of lecithin bilayers, where the form factor and structure factor are obtained simultaneously, and the obtained results provided new insight into this very well known system.
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Godeau G, Navailles L, Nallet F, Lin X, McIntosh TJ, Grinstaff MW. From Brittle to Pliant Viscoelastic Materials with Solid State Linear Polyphosphonium - Carboxylate Assemblies. Macromolecules 2012; 45:2509-2513. [PMID: 24511156 DOI: 10.1021/ma3002092] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A polystyrenylphosphonium polymer was synthesized and complexed with various carboxylic acid derivatives to form new solid-state polyelectrolyte-surfactant assemblies. The properties of these ionic materials were highly dependent on the nature of the anion and included a brittle material, a rubbery ball that bounces, or a sticky fiber. The values for the equilibrium modulus, storage modulus, and loss modulus were dependent on the composition of the carboxylic acid and the number of electrostatic interactions. Small-angle X-ray scattering studies on the supramolecular assemblies confirmed a bilayer structure for two of the assemblies.
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Affiliation(s)
- Guilhem Godeau
- Departments of Biomedical Engineering and Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, MA 02215
| | - Laurence Navailles
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600 Pessac, France
| | - Frédéric Nallet
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600 Pessac, France
| | - Xinrong Lin
- Departments of Biomedical Engineering and Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, MA 02215
| | - Thomas J McIntosh
- Department of Cell Biology, Duke University Medical Center, Durham, NC, 27710
| | - Mark W Grinstaff
- Departments of Biomedical Engineering and Chemistry, Metcalf Center for Science and Engineering, Boston University, Boston, MA 02215
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31
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Fay H, Meeker S, Cayer-Barrioz J, Mazuyer D, Ly I, Nallet F, Desbat B, Douliez JP, Ponsinet V, Mondain-Monval O. Polymorphism of natural fatty acid liquid crystalline phases. Langmuir 2012; 28:272-282. [PMID: 22118375 DOI: 10.1021/la203841y] [Citation(s) in RCA: 7] [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] [Indexed: 05/31/2023]
Abstract
We study the phase behavior in water of a mixture of natural long chain fatty acids (FAM) in association with ethylenediamine (EDA) and report a rich polymorphism depending on the composition. At a fixed EDA/FAM molar ratio, we observe upon dilution a succession of organized phases going from a lamellar phase to a hexagonal phase and, finally, to cylindrical micelles. The phase structure is established using polarizing microscopy, SAXS, and SANS. Interestingly, in the lamellar phase domain, we observe the presence of defects upon dilution, which SAXS shows to correspond to intrabilayer correlations. NMR and FF-TEM techniques suggest that these defects are related to an increase in the spontaneous curvature of the molecule monolayers in the lamellae. ATR-FTIR spectroscopy was also used to investigate the degree of ionization within these assemblies. The successive morphological transitions are discussed with regards to possible molecular mechanisms, in which the interaction between the acid surfactant and the amine counterion plays the leading role.
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Affiliation(s)
- Hélène Fay
- Université de Bordeaux, Centre de Recherche Paul Pascal, UPR CNRS 8641, 115 avenue Schweitzer, 33600 Pessac, France
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32
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Dobrindt J, Rodrigo Teixeira da Silva E, Alves C, Oliveira CLP, Nallet F, Andreoli de Oliveira E, Navailles L. Anisotropic Brownian motion in ordered phases of DNA fragments. Eur Phys J E Soft Matter 2012; 35:3. [PMID: 22270455 DOI: 10.1140/epje/i2012-12003-4] [Citation(s) in RCA: 3] [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] [Received: 10/17/2011] [Accepted: 12/20/2011] [Indexed: 05/31/2023]
Abstract
Using Fluorescence Recovery After Photobleaching, we investigate the Brownian motion of DNA rod-like fragments in two distinct anisotropic phases with a local nematic symmetry. The height of the measurement volume ensures the averaging of the anisotropy of the in-plane diffusive motion parallel or perpendicular to the local nematic director in aligned domains. Still, as shown in using a model specifically designed to handle such a situation and predicting a non-Gaussian shape for the bleached spot as fluorescence recovery proceeds, the two distinct diffusion coefficients of the DNA particles can be retrieved from data analysis. In the first system investigated (a ternary DNA-lipid lamellar complex), the magnitude and anisotropy of the diffusion coefficient of the DNA fragments confined by the lipid bilayers are obtained for the first time. In the second, binary DNA-solvent system, the magnitude of the diffusion coefficient is found to decrease markedly as DNA concentration is increased from isotropic to cholesteric phase. In addition, the diffusion coefficient anisotropy measured within cholesteric domains in the phase coexistence region increases with concentration, and eventually reaches a high value in the cholesteric phase.
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Affiliation(s)
- J Dobrindt
- Université de Bordeaux, Centre de recherche Paul-Pascal - CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
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33
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Fameau AL, Saint-Jalmes A, Cousin F, Houinsou Houssou B, Novales B, Navailles L, Nallet F, Gaillard C, Boué F, Douliez JP. Corrigendum: Smart Foams: Switching Reversibly between Ultrastable and Unstable Foams. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/anie.201107610] [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: 11/06/2022]
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34
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Fameau AL, Saint-Jalmes A, Cousin F, Houinsou Houssou B, Novales B, Navailles L, Nallet F, Gaillard C, Boué F, Douliez JP. Berichtigung: Smart Foams: Switching Reversibly between Ultrastable and Unstable Foams. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201107610] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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35
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Loudet-Courreges C, Nallet F, Dufourc EJ, Oda R. Unprecedented observation of days-long remnant orientation of phospholipid bicelles: a small-angle X-ray scattering and theoretical study. Langmuir 2011; 27:9122-9130. [PMID: 21662979 DOI: 10.1021/la1050817] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Nanometric bilayer-based self-assembled micelles commonly named as bicelles, formed with a mixture of long and short chains phosphatidylcholine lipids (PC), are known to orient spontaneously in a magnetic field. This field-induced orientational order strongly depends on the molecular structure of the phospholipids. Using small-angle X-ray scattering (SAXS), we performed detailed structural studies of bicelles and investigated the orientation/relaxation kinetics in three different systems: saturated-chain lipid bicelles made of DMPC (dimyristoyl PC)/DCPC (1,2-dicaproyl PC) with and without the added paramagnetic lanthanide ions Eu(3+), as well as bicelles of TBBPC (1-tetradecanoyl-2-(4-(4-biphenyl)butanoyl)-sn-glycero-3-PC)/DCPC. The structural study confirmed the previous NMR studies, which showed that DMPC bicelles orient with the membrane normal perpendicular (defined here as "nematic" orientation) to the magnetic field, whereas they orient parallel (defined here as "smectic" orientation) to the magnetic field in the presence of Eu(3+). The TBBPC bicelles also show smectic orientation. Surprisingly, the orientational order induced in the magnetic field remains even after the magnetic field is removed, which allowed us to investigate the orientation and relaxation kinetics of different bicelle structures. We demonstrate that this kinetics is very different for all three types of bicelles at the same lipid concentration; DMPC bicelles (~40 nm diameter) with and without Eu(3+) orient faster than TBBPC bicelles (~80 nm diameter). However, for the relaxation, DMPC bicelles (nematic) lose their macroscopic orientation only after one hour, whereas both DMPC bicelles with Eu(3+) and TBBPC bicelles (smectic) remarkably stay oriented for up to several days! These results indicate that the orientation mechanism of these nanometric disks in the magnetic field is governed by their size, with smaller bicelles orienting faster than the larger bicelles. Their relaxation mechanism outside the magnetic field, however, is governed by the degree of ordering. Indeed, the angular distribution of oriented bicelles is much narrower for the bicelles with smectic orientation, and, consequently, they keep aligned for much longer time (days) than those with nematic ordering (hours) outside the magnetic field. The understanding of the orientation/relaxation kinetics, as well as the morphologies of these "molecular goniometers" at molecular and supramolecular levels, allows controlling such an unprecedented long-range and long-lived smectic ordering of nanodisks and opens a wide field of applications for structural biology or material sciences.
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Affiliation(s)
- Cécile Loudet-Courreges
- UMR 5248 CBMN, CNRS-Université Bordeaux1-ENITAB, Institut Européen de Chimie et Biologie, Pessac, France
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36
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da Silva ERT, de Oliveira EA, Février A, Nallet F, Navailles L. Supramolecular polymorphism of DNA in non-cationic Lα lipid phases. Eur Phys J E Soft Matter 2011; 34:83. [PMID: 21870217 DOI: 10.1140/epje/i2011-11083-x] [Citation(s) in RCA: 4] [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] [Received: 05/20/2011] [Accepted: 08/15/2011] [Indexed: 05/31/2023]
Abstract
The structure of a complex between hydrated DNA and a non-cationic lipid is studied, including its phase diagram. The complex is spontaneously formed by adding DNA fragments (ca. 150 base pairs in length) to non-cationic lipids and water. The self-assembly process often leads to highly ordered structures. The structures were studied by combining X-ray scattering, fluorescence and polarized microscopy, as well as freeze-fracture experiments with transmission electron microscopy. We observe a significant increase of the smectic order as DNA is incorporated into the water layers of the lamellar host phase, and stabilization of single phase domains for large amounts of DNA. The effect of confinement on DNA ordering is investigated by varying the water content, following three dilution lines. A rich polymorphism is found, ranging from weakly correlated DNA-DNA in-plane organizations to highly ordered structures, where transmembrane correlations lead to the formation of columnar rectangular and columnar hexagonal superlattices of nucleotides embedded between lipid lamellae. From these observations, we suggest that addition of DNA to the lamellar phase significantly restricts membrane fluctuations above a certain concentration and helps the formation of the lipoplex. The alteration of membrane steric interactions, together with the appearance of interfacial interactions between membranes and DNA molecules may be a relevant mechanism for the emergence of highly ordered structures in the concentrated regime.
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Affiliation(s)
- E R Teixeira da Silva
- Université de Bordeaux, Centre de recherche Paul-Pascal-CNRS, 115 avenue du Docteur-Schweitzer, F-33600, Pessac, France
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37
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Fameau AL, Saint-Jalmes A, Cousin F, Houinsou Houssou B, Novales B, Navailles L, Nallet F, Gaillard C, Boué F, Douliez JP. Smart Foams: Switching Reversibly between Ultrastable and Unstable Foams. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102115] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Fameau AL, Saint-Jalmes A, Cousin F, Houinsou Houssou B, Novales B, Navailles L, Emile J, Nallet F, Gaillard C, Boué F, Douliez JP. Smart foams: switching reversibly between ultrastable and unstable foams. Angew Chem Int Ed Engl 2011; 50:8264-9. [PMID: 21780260 DOI: 10.1002/anie.201102115] [Citation(s) in RCA: 144] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Revised: 06/28/2011] [Indexed: 11/09/2022]
Affiliation(s)
- Anne-Laure Fameau
- Biopolymères Interactions Assemblages, INRA, Rue de la Géraudière, 44316 Nantes, France
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39
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Fameau AL, Cousin F, Navailles L, Nallet F, Boué F, Douliez JP. Multiscale Structural Characterizations of Fatty Acid Multilayered Tubes with a Temperature-Tunable Diameter. J Phys Chem B 2011; 115:9033-9. [DOI: 10.1021/jp201261e] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [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)
- Anne-Laure Fameau
- UR1268 Biopolymères Interactions Assemblages Inra, rue de la Géraudière, 44316 Nantes, France
- Laboratoire Léon-Brillouin, CEA Saclay, 91191 Gif-sur-Yvette CEDEX, France
| | - Fabrice Cousin
- Laboratoire Léon-Brillouin, CEA Saclay, 91191 Gif-sur-Yvette CEDEX, France
| | - Laurence Navailles
- Université de Bordeaux, Centre De Recherche Paul-Pascal−CNRS, 115 avenue du Docteur-Schweitzer, 33600 Pessac, France
| | - Frédéric Nallet
- Université de Bordeaux, Centre De Recherche Paul-Pascal−CNRS, 115 avenue du Docteur-Schweitzer, 33600 Pessac, France
| | - François Boué
- Laboratoire Léon-Brillouin, CEA Saclay, 91191 Gif-sur-Yvette CEDEX, France
| | - Jean-Paul Douliez
- UR1268 Biopolymères Interactions Assemblages Inra, rue de la Géraudière, 44316 Nantes, France
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40
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Pánek J, Filippov SK, Koňák Č, Nallet F, Noirez L, Karlsson G, Štěpánek P. Polymeric Nanoparticles Stabilized by Surfactants Investigated by Light Scattering, Small-Angle Neutron Scattering, and Cryo-TEM Methods. J DISPER SCI TECHNOL 2011. [DOI: 10.1080/01932691.2010.488475] [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: 10/18/2022]
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41
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Fameau AL, Houinsou-Houssou B, Ventureira JL, Navailles L, Nallet F, Novales B, Douliez JP. Self-assembly, foaming, and emulsifying properties of sodium alkyl carboxylate/guanidine hydrochloride aqueous mixtures. Langmuir 2011; 27:4505-4513. [PMID: 21405069 DOI: 10.1021/la2002404] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Unsaturated fatty acids may be extracted from various agricultural resources and are widely used as soaps in the industry. However, there also exist a large variety of saturated and hydroxy fatty acids in nature, but their metal salts crystallize at room temperature in water, hampering their use in biological and chemical studies or for industrial applications. Addition of guanidine hydrochloride (GuHCl) to sodium salt of myristic acid has been shown to prevent its crystallization in water, forming stable flat bilayers at room temperature. Herein, we extend this finding to two other saturated fatty acids (palmitic and stearic acids) and two hydroxyl fatty acids (juniperic and 12 hydroxy stearic acids) and study more deeply (by using small angle neutron scattering) the supramolecular assemblies formed in both saturated and hydroxyl fatty acid systems. In addition, we take the advantage that crystallization no longer occurs at room temperature in the presence of GuHCl to study the foaming and emulsifying properties of those fatty acid dispersions. Briefly, our results show that all fatty acids, even juniperic acid, which is a bola lipid, are arranged in a bilayer structure that may be interdigitated. Depending on the nature of the fatty acid, the systems exhibit good foamability and foam stability (except for juniperic acid), and emulsion stability was good. Those findings should be of interest for using saturated long chain (and hydroxyl) fatty acids as surfactants for detergency or even materials chemistry.
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Affiliation(s)
- Anne-Laure Fameau
- UR1268, INRA Nantes, Biopolymères Interactions Assemblages, rue de la Géraudière, 44316 Nantes, France
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42
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43
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Hessel V, Ringsdorf H, Laversanne R, Nallet F. α, ω-Dipolar amphiphiles: Influence of rigid and flexible units on aggregation behavior. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19931120606] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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44
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Novales B, Riaublanc A, Navailles L, Houssou BH, Gaillard C, Nallet F, Douliez JP. Self-assembly and foaming properties of fatty acid-lysine aqueous dispersions. Langmuir 2010; 26:5329-5334. [PMID: 20334439 DOI: 10.1021/la9034613] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report on dispersions of fatty acid-lysine salts in aqueous solutions which are further used to produce foams. The alkyl chain length is varied from dodecyl to stearic. In aqueous solutions, the lysine salt of the dodecyl chain yields an isotropic solution, probably micelles, whereas for longer alkyl chains, vesicles formed but crystallized upon resting at room temperature or when kept at 4 degrees C. Solid-state NMR showed that in vesicles fatty acids are embedded in a lamellar arrangement passing from a gel to a fluid state upon heating; the transition temperature at which it occurs was determined by DSC. Those results are confirmed by small-angle neutron scattering which also give additional information on the bilayer structure. Incredibly stable foams are obtained using the palmitic acid/Lys salt whereas for other alkyl chain length, poor or no foam is formed. We conclude that the foamability is related to the phase behavior in aqueous solution.
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Affiliation(s)
- Bruno Novales
- UR1268 Biopolymères Interactions Assemblages, INRA, équipe Interfaces et Systèmes Dispersés, F-44316 Nantes, France
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45
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Giacomelli FC, da Silveira NP, Nallet F, Černoch P, Steinhart M, Štěpánek P. Cubic to Hexagonal Phase Transition Induced by Electric Field. Macromolecules 2010. [DOI: 10.1021/ma1000817] [Citation(s) in RCA: 19] [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: 11/30/2022]
Affiliation(s)
- Fernando C. Giacomelli
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Rua Santa Adélia 166, 09210-170, Santo André - SP, Brazil
| | - Nádya P. da Silveira
- Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil
| | - Frédéric Nallet
- Centre de Recherche Paul-Pascal, CNRS, 115 Avenue du Docteur-Schweitzer, 33600 Pessac, France
| | - Petr Černoch
- Institute of Macromolecular Chemistry, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic
| | - Miloš Steinhart
- Institute of Macromolecular Chemistry, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic
| | - Petr Štěpánek
- Institute of Macromolecular Chemistry, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic
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Grelet E, Dardel S, Bock H, Goldmann M, Lacaze E, Nallet F. Morphology of open films of discotic hexagonal columnar liquid crystals as probed by grazing incidence X-ray diffraction. Eur Phys J E Soft Matter 2010; 31:343-349. [PMID: 20411293 DOI: 10.1140/epje/i2010-10586-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 02/24/2010] [Accepted: 03/03/2010] [Indexed: 05/29/2023]
Abstract
The structure and the orientation of thermotropic hexagonal columnar liquid crystals are studied by grazing incidence X-ray diffraction (GIXD) for different discotic compounds in the geometry of open supported thin films. Whatever the film deposition mode (either spin-coating or vacuum evaporation) and the film thickness, a degenerate planar alignment with the liquid crystalline columns parallel to the substrate is found. However, if a specific thermal process is applied to the liquid crystal film, homeotropic anchoring (columns normal to the interface) can be stabilized in a metastable state.
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Affiliation(s)
- Eric Grelet
- Centre de Recherche Paul-Pascal, CNRS -Université de Bordeaux, 115 Avenue Schweitzer, 33600, Pessac, France.
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47
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Stepánek P, Tuzar Z, Kadlec P, Nallet F, da Silveira NP. Structure of self-organized diblock copolymer solutions in partially miscible solvents. Phys Chem Chem Phys 2010; 12:2944-9. [PMID: 20449385 DOI: 10.1039/b917506g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A diblock copolymer dissolved in a mixture of partially miscible solvents creates a self-organized microemulsion with a morphology that depends on the numerous parameters of the system. We discuss one particular case of spherical particles (containing the minority solvent) forming a hard gel with cubic structure and demonstrate using high-resolution synchrotron scattering experiments that the self-organized solution has a BCC structure. After fitting one- and two-dimensional form factors we extract from the data the one- and two-dimensional structure factors, S(q) and S(q,phi). The experimental S(q) corresponds almost quantitatively, up to the 9th order Bragg peak, to that calculated numerically for a randomly-oriented, finite-size BCC crystal. S(q,phi) contains a large number of reflections that allow the structure to be identified more exactly as a twin BCC morphology with some imperfections. Examination of the dependence of the structural parameters on polymer concentration reveals that the dilution law predicted theoretically for the center-to-center distance of the spheres is confirmed experimentally while the size of the spherical objects does not follow theoretical predictions due to chain extension with increasing concentration.
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Affiliation(s)
- Petr Stepánek
- Institute of Macromolecular Chemistry, Heyrovský Sq. 2, 16206 Prague 6, Czech Republic.
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48
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Meyre ME, Clérac R, Mornet S, Duguet E, Dole F, Nallet F, Lambert O, Trépout S, Faure C. Multilamellar liposomes entrapping aminosilane-modified maghemite nanoparticles: “magnetonions”. Phys Chem Chem Phys 2010; 12:12794-801. [DOI: 10.1039/c0cp00231c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Khiati S, Pierre N, Andriamanarivo S, Grinstaff MW, Arazam N, Nallet F, Navailles L, Barthélémy P. Anionic nucleotide--lipids for in vitro DNA transfection. Bioconjug Chem 2009; 20:1765-72. [PMID: 19711898 DOI: 10.1021/bc900163s] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A family of new anionic nucleotide based lipids featuring thymidine-3'-monophosphate as nucleotide and 1,2-diacyl-sn-glycerol as lipid moiety for in vitro delivery of nucleic acids is described. The nucleotide lipids were prepared in three steps starting from 1,2-diacyl-sn-glycerols and 2'-deoxythymidine-3'-phosphoramidite. Gel electrophoresis experiments show that nucleotide-based lipid-DNA complexes are observed at Ca(2+) concentration higher than 1 mM. The transfection experiments carried out on mammalian Hek cell lines clearly demonstrate that the nucleotide moiety enhances the transfection efficacy of the natural anionic DPPA and DPPG lipids. SAXS studies indicate that the enhancement in transfection for nucleotide-based lipid formulations compared to those of the abasic natural derivative (DPPA) is likely due to the presence of the 2D columnar inverted hexagonal phase (H(II)) with a unit cell parameter a = 69.1 A in the nucleotide lipid formulations. The cytotoxicity studies of lipoplexes, evaluated against Hek cells using an MTS assay, revealed that palmitoyl nucleotide derivative complexes were not toxic even after 4 h of incubation, thus indicating that the anionic nucleotide lipids presented in this work offer an alternative to cationic transfection reagents.
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50
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Tuzar Z, Kadlec P, Stepánek P, Kríz J, Nallet F, Noirez L. Micelles of a diblock copolymer of styrene and ethylene oxide in mixtures of 2,6-lutidine and water. Langmuir 2008; 24:13863-13865. [PMID: 19360951 DOI: 10.1021/la803397g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We studied the micelle formation of a diblock copolymer of styrene and ethylene oxide in mixtures of 2,6-dimethylpyridine (2,6-lutidine) and water. Micelles are formed in a broad solvent composition range with a volume fraction of water ranging from 0.05 to 0.85, where neither polystyrene nor polyethylene oxide homopolymers are soluble. The diffusion behavior of pure solvent mixtures and in solutions of copolymer micelles is reported. In LTD/water mixtures, two diffusive processes corresponding to self-difusion and two modes belonging to mutual diffusion and diffusion of solvent clusters have been found. In copolymer solutions, the mode of copolymer micelle diffusion replaces the mode of solvent cluster diffusion. Quasielastic light scattering, small-angle neutron scattering, and pulsed-field gradient NMR have been employed in our study.
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Affiliation(s)
- Z Tuzar
- Institute of Macromolecular Chemistry, Heyrovský Sq. 2, 16206 Prague 6, Czech Republic
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