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Petcu G, Anghel EM, Atkinson I, Culita DC, Apostol NG, Kuncser A, Papa F, Baran A, Blin JL, Parvulescu V. Composite Photocatalysts with Fe, Co, and Ni Oxides on Supports with Tetracoordinated Ti Embedded into Aluminosilicate Gel during Zeolite Y Synthesis. Gels 2024; 10:129. [PMID: 38391459 PMCID: PMC10888282 DOI: 10.3390/gels10020129] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/02/2024] [Accepted: 02/03/2024] [Indexed: 02/24/2024] Open
Abstract
Ti-aluminosilicate gels were used as supports for the immobilization of Fe, Co, and Ni oxides (5%) by impregnation and synthesis of efficient photocatalysts for the degradation of β-lactam antibiotics from water. Titanium oxide (1 and 2%) was incorporated into the zeolite network by modifying the gel during the zeolitization process. The formation of the zeolite Y structure and its microporous structure were evidenced by X-ray diffraction and N2 physisorption. The structure, composition, reduction, and optical properties were studied by X-ray diffraction, H2-TPR, XPS, Raman, photoluminescence, and UV-Vis spectroscopy. The obtained results indicated a zeolite Y structure for all photocatalysts with tetracoordinated Ti4+ sites. The second transitional metals supported by the post-synthesis method were obtained in various forms, such as oxides and/or in the metallic state. A red shift of the absorption edge was observed in the UV-Vis spectra of photocatalysts upon the addition of Fe, Co, or Ni species. The photocatalytic performances were evaluated for the degradation of cefuroxime in water under visible light irradiation. The best results were obtained for iron-immobilized photocatalysts. Scavenger experiments explained the photocatalytic results and their mechanisms. A different contribution of the active species to the photocatalytic reactions was evidenced.
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Affiliation(s)
- Gabriela Petcu
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Elena Maria Anghel
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Irina Atkinson
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Daniela C Culita
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Nicoleta G Apostol
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - Andrei Kuncser
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - Florica Papa
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Adriana Baran
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Jean-Luc Blin
- Faculty of Sciences and Technology, University of Lorraine, CNRS, L2CM, F-54000 Nancy, France
| | - Viorica Parvulescu
- Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
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Petcu G, Papa F, Atkinson I, Baran A, Apostol NG, Petrescu S, Richaudeau L, Blin JL, Parvulescu V. Co- and Ni-Doped TiO 2 Nanoparticles Supported on Zeolite Y with Photocatalytic Properties. Nanomaterials (Basel) 2023; 13:2200. [PMID: 37570517 PMCID: PMC10420643 DOI: 10.3390/nano13152200] [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] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/19/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023]
Abstract
Zeolite Y samples with microporous and hierarchical structures containing Ti-Ni and Ti-Co oxides were obtained as active photocatalysts. Different Ti amounts (5, 10% TiO2) were supported, followed by the loading of Ni or Co oxides (5%). X-ray diffraction evidenced the presence of TiO2 as an anatase. N2 adsorption-desorption results showed type IV isotherms for hierarchical zeolite Y samples, and a combination of type IV and I isotherms for zeolite Y samples. UV-Vis diffuse reflectance spectra showed a shift in the absorption band to visible with increasing Ti loading and especially after Co and Ni addition. A significant effect of the support was evidenced for Ti and its interaction with Co/Ni species. The zeolite Y support stabilized Ti in the 4+ oxidation state while hierarchical zeolite Y support favored the formation of Ti3+ species, Ni0 and Ni2+ and the oxidation of Co to 3+ oxidation state. Photocatalytic activity, under UV and visible light irradiation, was evaluated by the degradation of amoxicillin, used as a model test. The photocatalytic mechanism was investigated using ethanol, p-benzoquinone and KI as ·OH and ·O2- radicals and hole (h+) scavengers. The best results were obtained for the immobilized Ni-Ti species on the hierarchical zeolite Y support.
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Affiliation(s)
- Gabriela Petcu
- Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, 060021 Bucharest, Romania; (G.P.); (F.P.); (I.A.); (A.B.); (S.P.); (V.P.)
| | - Florica Papa
- Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, 060021 Bucharest, Romania; (G.P.); (F.P.); (I.A.); (A.B.); (S.P.); (V.P.)
| | - Irina Atkinson
- Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, 060021 Bucharest, Romania; (G.P.); (F.P.); (I.A.); (A.B.); (S.P.); (V.P.)
| | - Adriana Baran
- Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, 060021 Bucharest, Romania; (G.P.); (F.P.); (I.A.); (A.B.); (S.P.); (V.P.)
| | - Nicoleta G. Apostol
- National Institute of Materials Physics, Atomiștilor 405A, 077125 Magurele, Romania;
| | - Simona Petrescu
- Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, 060021 Bucharest, Romania; (G.P.); (F.P.); (I.A.); (A.B.); (S.P.); (V.P.)
| | - Lionel Richaudeau
- Faculty of Sciences and Technology, University of Lorraine, CNRS, L2CM, F-54000 Nancy, France;
| | - Jean-Luc Blin
- Faculty of Sciences and Technology, University of Lorraine, CNRS, L2CM, F-54000 Nancy, France;
| | - Viorica Parvulescu
- Institute of Physical Chemistry “Ilie Murgulescu”, Romanian Academy, 060021 Bucharest, Romania; (G.P.); (F.P.); (I.A.); (A.B.); (S.P.); (V.P.)
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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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Roy T, Rousseau J, Daudin A, Pirngruber G, Lebeau B, Blin JL, Brunet S. Deep hydrodesulfurization of 4,6-dimethydibenzothiophene over CoMoS/TiO2 catalysts: Impact of the TiO2 treatment. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.05.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yang F, Backov R, Blin JL, Fáklya B, Tron T, Mekmouche Y. Site directed confinement of laccases in a porous scaffold towards robustness and selectivity. Biotechnol Rep (Amst) 2021; 31:e00645. [PMID: 34189063 PMCID: PMC8219655 DOI: 10.1016/j.btre.2021.e00645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 06/04/2021] [Accepted: 06/07/2021] [Indexed: 10/31/2022]
Abstract
We immobilized a fungal laccase with only two spatially close lysines available for functionalization into macrocellular Si(HIPE) monoliths for the purpose of continuous flow catalysis. Immobilization (30-45 % protein immobilization yields) was obtained using a covalent bond forming reaction between the enzyme and low glutaraldehyde (0.625 % (w/w)) functionalized foams. Testing primarily HBT-mediated RB5 dye decolorization in continuous flow reactors, we show that the activity of the heterogeneous catalyst is comparable to its homogeneous counterpart. More, its operational activity remains as high as 60 % after twelve consecutive decolorization cycles as well as after one-year storage, performances remarkable for such a material. We further immobilized two variants of the laccase containing a unique lysine: one located in the vicinity of the substrate oxidation site (K157) and one at the opposite side of this oxidation site (K71) to study the effect of the proximity of the Si(HIPE) surface on enzyme activity. Comparing activities on different substrates for monoliths with differentially oriented catalysts, we show a twofold discrimination for ABTS relative to ascorbate. This study provides ground for the development of neo-functionalized materials that beyond allowing stability and reusability will become synergic partners in the catalytic process.
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Key Words
- ABTS, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid
- APTES, (3-Aminopropyl)triethoxysilane
- Asc, ascorbic acid
- BET, Brunauer, Emmett et Teller
- DPBS, Dulbecco's Phosphate-Buffered Saline, pH 7.0
- Enz., enzyme
- HBT, N-Hydroxy benzotriazole
- HIPE, High Internal Phase Emulsion
- Heterogeneous catalysis
- Laccase
- Orientation
- RB5, Reactive black 5
- RBBR, Remazol Brilliant Blue B
- S.A., specific activity
- Site-directed immobilization
- TEOS, Tetraethyl-orthosilane
- TNC, TriNuclear Cluster
- TTAB, tetradecyltrimethylammonium bromide
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Affiliation(s)
- Fangfang Yang
- Aix Marseille Univ, Centrale Marseille, CNRS, iSm2, Marseille, France
| | - Rénal Backov
- Université de Bordeaux, CNRS, CRPP, UMR5031, 115 Avenue Albert Schweitzer, F-33600, Pessac, France
| | - Jean-Luc Blin
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France
| | - Bernadett Fáklya
- Aix Marseille Univ, Centrale Marseille, CNRS, iSm2, Marseille, France
| | - Thierry Tron
- Aix Marseille Univ, Centrale Marseille, CNRS, iSm2, Marseille, France
| | - Yasmina Mekmouche
- Aix Marseille Univ, Centrale Marseille, CNRS, iSm2, Marseille, France
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Lebeau B, Naboulsi I, Michelin L, Marichal C, Rigolet S, Carteret C, Brunet S, Bonne M, Blin JL. Amorphous mesostructured zirconia with high (hydro)thermal stability. RSC Adv 2020; 10:26165-26176. [PMID: 35519781 PMCID: PMC9055362 DOI: 10.1039/d0ra04824k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 06/01/2020] [Accepted: 07/07/2020] [Indexed: 11/21/2022] Open
Abstract
Here, combining the evaporation-induced self-assembly (EISA) method and the liquid crystal templating pathway, mesostructured amorphous zirconium oxides have been prepared by a soft templating method without addition of any heteroelement to stabilize the mesopore framework. The recovered materials have been characterized by SAXS measurements, nitrogen adsorption–desorption analysis and X-ray diffraction (XRD). The obtained mesostructured zirconia exhibits a high thermal stability. An in situ XRD study performed as a function of temperature shows that the amorphous ZrO2, obtained after removal of the pore templating agent (pluronic P123), begins to crystallize in air from 420 °C. Amorphous mesostructured ZrO2 also presents a high hydrothermal stability; these materials are not degraded after 72 hours in boiling water. Amorphous mesostructured zirconia with high thermal stability and hydrothermal stability in boiling water has been obtained without addition of stabilizer.![]()
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Affiliation(s)
- Bénédicte Lebeau
- Université de Haute Alsace (UHA), CNRS, IS2M UMR 7361 F-68100 Mulhouse France.,Université de Strasbourg 67000 Strasbourg France
| | - Issam Naboulsi
- Université de Lorraine, CNRS, L2CM 7053, Faculté des Sciences et Technologies BP 70239 F-54506 Vandoeuvre-lès-Nancy Cedex France +33 3 83 68 43 70
| | - Laure Michelin
- Université de Haute Alsace (UHA), CNRS, IS2M UMR 7361 F-68100 Mulhouse France.,Université de Strasbourg 67000 Strasbourg France
| | - Claire Marichal
- Université de Haute Alsace (UHA), CNRS, IS2M UMR 7361 F-68100 Mulhouse France.,Université de Strasbourg 67000 Strasbourg France
| | - Séverinne Rigolet
- Université de Haute Alsace (UHA), CNRS, IS2M UMR 7361 F-68100 Mulhouse France.,Université de Strasbourg 67000 Strasbourg France
| | | | - Sylvette Brunet
- Université de Poitiers, CNRS, IC2MP, UMR 7285 86073 Poitiers Cedex 9 France
| | - Magali Bonne
- Université de Haute Alsace (UHA), CNRS, IS2M UMR 7361 F-68100 Mulhouse France.,Université de Strasbourg 67000 Strasbourg France
| | - Jean-Luc Blin
- Université de Lorraine, CNRS, L2CM 7053, Faculté des Sciences et Technologies BP 70239 F-54506 Vandoeuvre-lès-Nancy Cedex France +33 3 83 68 43 70
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Affiliation(s)
- Jean-Luc Blin
- Université de Lorraine/CNRS; L2CM, UMR7053; BP 7023 54506 Vandoeuvre-lès-Nancy cedex France
| | - Philippe Riachy
- Université de Lorraine/CNRS; L2CM, UMR7053; BP 7023 54506 Vandoeuvre-lès-Nancy cedex France
| | - Cédric Carteret
- Université de Lorraine/CNRS; LCPME, UMR7564; 54600 Villers-lès-Nancy France
| | - Bénédicte Lebeau
- Université de Haute Alsace (UHA)/CNRS; IS2M, UMR 7361; 68093 Mulhouse cedex France
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Roucher A, Emo M, Vibert F, Stébé MJ, Schmitt V, Jonas F, Backov R, Blin JL. Investigation of mixed ionic/nonionic building blocks for the dual templating of macro-mesoporous silica. J Colloid Interface Sci 2019; 533:385-400. [DOI: 10.1016/j.jcis.2018.08.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 08/21/2018] [Accepted: 08/22/2018] [Indexed: 10/28/2022]
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Assaker K, Stébé MJ, Blin JL. Mesoporous silica materials from diluted and concentrated solutions of nonionic fluorinated and ionic hydrogenated surfactants mixtures. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.02.056] [Citation(s) in RCA: 4] [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: 11/26/2022]
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Riachy P, Lopez G, Emo M, Stébé MJ, Blin JL, Ameduri B. Investigation of a novel fluorinated surfactant-based system for the design of spherical wormhole-like mesoporous silica. J Colloid Interface Sci 2017; 487:310-319. [DOI: 10.1016/j.jcis.2016.10.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 10/18/2016] [Accepted: 10/19/2016] [Indexed: 12/20/2022]
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Chavez Panduro EA, Assaker K, Beuvier T, Blin JL, Stébé MJ, Konovalov O, Gibaud A. Nonionic Fluorinated Surfactant Removal from Mesoporous Film Using sc-CO 2. ACS Appl Mater Interfaces 2017; 9:3093-3101. [PMID: 28030765 DOI: 10.1021/acsami.6b12936] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Surfactant templated silica thin films were self-assembled on solid substrates by dip-coating using a partially fluorinated surfactant R8F(EO)9 as the liquid crystal template. The aim was 2-fold: first we checked which composition in the phase diagram was corresponding to a 2D rectangular highly ordered crystalline phase and second we exposed the films to sc-CO2 to foster the removal of the surfactant. The films were characterized by in situ X-ray reflectivity (XRR) and grazing incidence small angle X-ray scattering (GISAXS) under CO2 pressure from 0 to 100 bar at 34 °C. GISAXS patterns reveal the formation of a 2-D rectangular structure at a molar ratio R8F(EO)9/Si equal to 0.1. R8F(EO)9 micelles have a cylindrical shape, which have a core/shell structure ordered in a hexagonal system. The core contains the R8F part and the shell is a mixture of (EO)9 embedded in the silica matrix. We further evidence that the extraction of the template using supercritical carbon dioxide can be successfully achieved. This can be attributed to both the low solubility parameter of the surfactants and the fluorine and ethylene oxide CO2-philic groups. The initial 2D rectangular structure was well preserved after depressurization of the cell and removal of the surfactant. We attribute the very high stability of the rinsed film to the large value of the wall thickness relatively to the small pore size.
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Affiliation(s)
- Elvia A Chavez Panduro
- Deparment of Physics, Norwegian University of Science and Technology ,Høgskoleringen 5, 7491 Trondheim, Norway
- IMMM, UMR CNRS 6087, Université du Maine , Le Mans 72085 cedex 09, France
- ESRF , 6 Jules Horowitz, Grenoble 38000 cedex, France
| | - Karine Assaker
- Université de Lorraine/CNRS, SRSMC, UMR7565 , Vandoeuvre-lès-Nancy F-54506 cedex, France
| | - Thomas Beuvier
- IMMM, UMR CNRS 6087, Université du Maine , Le Mans 72085 cedex 09, France
| | - Jean-Luc Blin
- Université de Lorraine/CNRS, SRSMC, UMR7565 , Vandoeuvre-lès-Nancy F-54506 cedex, France
| | - Marie-José Stébé
- Université de Lorraine/CNRS, SRSMC, UMR7565 , Vandoeuvre-lès-Nancy F-54506 cedex, France
| | | | - Alain Gibaud
- IMMM, UMR CNRS 6087, Université du Maine , Le Mans 72085 cedex 09, France
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Naboulsi I, Lebeau B, Michelin L, Carteret C, Vidal L, Bonne M, Blin JL. Insights into the Formation and Properties of Templated Dual Mesoporous Titania with Enhanced Photocatalytic Activity. ACS Appl Mater Interfaces 2017; 9:3113-3122. [PMID: 28032502 DOI: 10.1021/acsami.6b13269] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The one pot synthesis of dual mesoporous titania (2.3 and 7.7 nm) has been achieved from a mixture of fluorinated and Pluronic surfactants. The small and large mesopore networks are templated, respectively, by a fluorinated-rich liquid crystal and a Pluronic-rich liquid crystal, which are in equilibrium. After calcination at 350 °C, the amorphous walls are transformed into semicrystalline anatase preserving the mesoporous structure. Results concerning the photodegradation of methyl orange using the calcined photocatalysts highlight that the kinetic rate constant (k) determined for the dual mesoporous titania is 2.6 times higher than the k value obtained for the monomodal ones.
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Affiliation(s)
- Issam Naboulsi
- Université de Lorraine/CNRS , SRSMC, UMR7565, F-54506 Vandoeuvre-lès-Nancy Cedex, France
| | - Bénédicte Lebeau
- Université de Haute Alsace (UHA)/CNRS , Equipe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), UMR7361, F-68093 Mulhouse Cedex, France
| | - Laure Michelin
- Université de Haute Alsace (UHA)/CNRS , Equipe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), UMR7361, F-68093 Mulhouse Cedex, France
| | - Cédric Carteret
- Université de Lorraine/CNRS , LCPME, UMR7564, F-54600 Villers-lès-Nancy, France
| | - Loic Vidal
- Université de Haute Alsace (UHA)/CNRS , Equipe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), UMR7361, F-68093 Mulhouse Cedex, France
| | - Magali Bonne
- Université de Haute Alsace (UHA)/CNRS , Equipe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), UMR7361, F-68093 Mulhouse Cedex, France
| | - Jean-Luc Blin
- Université de Lorraine/CNRS , SRSMC, UMR7565, F-54506 Vandoeuvre-lès-Nancy Cedex, France
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Laaz I, Stébé MJ, Benhamou A, Zoubir D, Blin JL. Influence of porosity and surface modification on the adsorption of both cationic and anionic dyes. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2015.11.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Besançon M, Michelin L, Josien L, Vidal L, Assaker K, Bonne M, Lebeau B, Blin JL. Influence of the porous texture of SBA-15 mesoporous silica on the anatase formation in TiO2–SiO2 nanocomposites. NEW J CHEM 2016. [DOI: 10.1039/c5nj02859k] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [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
TiO2–SiO2 composites with 44 wt% of anatase exhibit a better MO degradation rate than those with fully crystallized anatase.
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Affiliation(s)
- Manon Besançon
- Université de Haute Alsace
- CNRS
- Equipe Matériaux à Porosité Contrôlée
- Institut de Science des Matériaux de Mulhouse
- UMR 7361
| | - Laure Michelin
- Université de Haute Alsace
- CNRS
- Equipe Matériaux à Porosité Contrôlée
- Institut de Science des Matériaux de Mulhouse
- UMR 7361
| | - Ludovic Josien
- Université de Haute Alsace
- CNRS
- Equipe Matériaux à Porosité Contrôlée
- Institut de Science des Matériaux de Mulhouse
- UMR 7361
| | - Loic Vidal
- Université de Haute Alsace
- CNRS
- Equipe Matériaux à Porosité Contrôlée
- Institut de Science des Matériaux de Mulhouse
- UMR 7361
| | - Karine Assaker
- SRSMC UMR 7565
- Université de Lorraine
- CNRS
- F-54506 Vandoeuvre-lès-Nancy Cedex
- France
| | - Magali Bonne
- Université de Haute Alsace
- CNRS
- Equipe Matériaux à Porosité Contrôlée
- Institut de Science des Matériaux de Mulhouse
- UMR 7361
| | - Bénédicte Lebeau
- Université de Haute Alsace
- CNRS
- Equipe Matériaux à Porosité Contrôlée
- Institut de Science des Matériaux de Mulhouse
- UMR 7361
| | - Jean-Luc Blin
- SRSMC UMR 7565
- Université de Lorraine
- CNRS
- F-54506 Vandoeuvre-lès-Nancy Cedex
- France
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Schmitt J, Canilho N, Impéror-Clerc M, Blin JL, Pedersen JS, Pérez J, Lebeau B, Vidal L, Stébé MJ. In Situ Small-Angle X-ray Scattering Investigation of the Formation of Dual-Mesoporous Materials. Chemphyschem 2015; 16:3637-41. [DOI: 10.1002/cphc.201500642] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Julien Schmitt
- Physical Chemistry; Lund University; P.O. Box 124 SE-221 00 Lund Sweden
| | - Nadia Canilho
- Université de Lorraine, UMR CNRS 7565 SRSMC; 54506 Vandoeuvre les Nancy cedex France
| | - Marianne Impéror-Clerc
- Laboratoire de Physique de Solides, UMR CNRS 8502, Bât. 510; Université Paris-Sud; F-91405 Orsay France
| | - Jean-Luc Blin
- Université de Lorraine, UMR CNRS 7565 SRSMC; 54506 Vandoeuvre les Nancy cedex France
| | - Jan Skov Pedersen
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO); Aarhus University Gustav Wieds Vej 14; 8000 Aarhus C Denmark
| | - Javier Pérez
- Beamline SWING, Synchrotron Soleil, BP 48; F-91192 Gif-sur-Yvette France
| | - Bénédicte Lebeau
- Université de Haute Alsace; Institut de Science des Matériaux de Mulhouse (IS2 M), Equipe Matériaux à Porosité Contrôlée (MPC), UMR CNRS 7361; F-68093 Mulhouse cedex France
| | - Loic Vidal
- Université de Haute Alsace; Institut de Science des Matériaux de Mulhouse (IS2 M), Equipe Matériaux à Porosité Contrôlée (MPC), UMR CNRS 7361; F-68093 Mulhouse cedex France
| | - Marie-José Stébé
- Université de Lorraine, UMR CNRS 7565 SRSMC; 54506 Vandoeuvre les Nancy cedex France
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Kim S, Stébé MJ, Blin JL, Pasc A. pH-controlled delivery of curcumin from a compartmentalized solid lipid nanoparticle@mesostructured silica matrix. J Mater Chem B 2014; 2:7910-7917. [DOI: 10.1039/c4tb01133c] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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17
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Blin JL, Jacoby J, Kim S, Stébé MJ, Canilho N, Pasc A. A meso-macro compartmentalized bioreactor obtained through silicalization of “green” double emulsions: W/O/W and W/SLNs/W. Chem Commun (Camb) 2014; 50:11871-4. [DOI: 10.1039/c4cc06007e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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
We report a straightforward approach for both structuring and entrapping enzymes into hierarchical silica materials with hexagonally ordered mesopores and tailored macroporosity by converting a double emulsion colloidal template into solid lipid nanoparticles.
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Affiliation(s)
- Jean-Luc Blin
- SRSMC UMR 7565
- Université de Lorraine
- CNRS, BP 70239
- F-54506 Vandoeuvre-lès-Nancy cedex, France
| | - Jonathan Jacoby
- SRSMC UMR 7565
- Université de Lorraine
- CNRS, BP 70239
- F-54506 Vandoeuvre-lès-Nancy cedex, France
| | - Sanghoon Kim
- SRSMC UMR 7565
- Université de Lorraine
- CNRS, BP 70239
- F-54506 Vandoeuvre-lès-Nancy cedex, France
| | - Marie-José Stébé
- SRSMC UMR 7565
- Université de Lorraine
- CNRS, BP 70239
- F-54506 Vandoeuvre-lès-Nancy cedex, France
| | - Nadia Canilho
- SRSMC UMR 7565
- Université de Lorraine
- CNRS, BP 70239
- F-54506 Vandoeuvre-lès-Nancy cedex, France
| | - Andreea Pasc
- SRSMC UMR 7565
- Université de Lorraine
- CNRS, BP 70239
- F-54506 Vandoeuvre-lès-Nancy cedex, France
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Assaker K, Carteret C, Roques-Carmes T, Ghanbaja J, Stébé MJ, Blin JL. Influence of Zn ion addition on the properties of ordered mesoporous TiO2. NEW J CHEM 2014. [DOI: 10.1039/c4nj00051j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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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Schmitt J, Impéror-Clerc M, Michaux F, Blin JL, Stébé MJ, Pedersen JS, Meneau F. Formation of nanostructured silica materials templated with nonionic fluorinated surfactant followed by in situ SAXS. Langmuir 2013; 29:2007-2023. [PMID: 23305390 DOI: 10.1021/la304648j] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The formation of two-dimensional (2D)-hexagonal (p6m) silica-based hybrid materials from concentrated micellar solutions (10 wt %) of two nonionic fluorinated surfactants, R(7)(F)(EO)(8) and R(8)(F)(EO)(9), is investigated in situ using synchrotron time-resolved small angle X-ray scattering (SAXS). The two surfactants form direct micelles with different structures prior to the silica precursor addition as demonstrated by SAXS and SANS. R(8)(F)(EO)(9) gives spherical micelles and R(7)(F)(EO)(8) more complex ones, modeled here as short wormlike micelles. The in situ SAXS experiments reveal that both surfactants form well-ordered 2D-hexagonal hybrid materials after the addition of the silica precursor, in coexistence with an excess of surfactant micelles. The structures of both 2D-hexagonal phases are compared just after precipitation, and it is found that more robust and larger silica walls are formed for R(8)(F)(EO)(9) than for R(7)(F)(EO)(8). This could explain why only the material obtained with R(8)(F)(EO)(9) is stable upon washing, as observed previously. Moreover, it is proposed that in both cases, only a part of the micelles interact with the silica oligomers and undergo structural modifications before forming the 2D-hexagonal mesophase. The obtained results are finally discussed in the more general framework of the templating mechanism for nonionic surfactants.
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Affiliation(s)
- Julien Schmitt
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
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Stébé MJ, Emo M, Forny-Le Follotec A, Metlas-Komunjer L, Pezron I, Blin JL. Triblock siloxane copolymer surfactant: template for spherical mesoporous silica with a hexagonal pore ordering. Langmuir 2013; 29:1618-1626. [PMID: 23305163 DOI: 10.1021/la304315v] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ordered mesoporous silica materials with a spherical morphology have been prepared for the first time through the cooperative templating mechanism (CTM) by using a silicone triblock copolymer as template. The behavior of the pure siloxane copolymer amphiphile in water was first investigated. A direct micellar phase (L(1)) and a hexagonal (H(1)) liquid crystal were found. The determination of the structural parameters by SAXS measurements leads us to conclude that in the hexagonal liquid crystal phase a part of the ethylene oxide group is not hydrated as observed for the micelles. Mesoporous materials were then synthesized from the cooperative templating mechanism. The recovered materials were characterized by SAXS measurements, nitrogen adsorption-desorption analysis, and transmission and scanning electron microscopy. The results clearly evidence that one can control the morphology and the nanostructuring of the resulting material by modifying the synthesis parameters. Actually, highly ordered mesoporous materials with a spherical morphology have been obtained with a siloxane copolymer/tetramethoxysilane molar ratio of 0.10 after hydrothermal treatment at 100 °C. Our study also supports the fact that the interactions between micelles and the hydrolyzed precursor are one of the key parameters governing the formation of ordered mesostructures through the cooperative templating mechanism. Indeed, we have demonstrated that when the interactions between micelles are important, only wormhole-like structures are recovered.
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Affiliation(s)
- M J Stébé
- SRSMC, UMR7565, Université de Lorraine, F-54506 Vandoeuvre-lès-Nancy cedex, France
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Assaker K, Lebeau B, Marichal C, Carteret C, Vidal L, Stébé MJ, Blin JL. Facile and green release of template from mesostructured titania. RSC Adv 2013. [DOI: 10.1039/c3ra42981d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Blin JL, Stébé MJ, Roques-Carmes T. Use of ordered mesoporous titania with semi-crystalline framework as photocatalyst. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.05.029] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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May A, Pasc A, Stébé MJ, Gutiérrez JM, Porras M, Blin JL. Tailored jeffamine molecular tools for ordering mesoporous silica. Langmuir 2012; 28:9816-9824. [PMID: 22650907 DOI: 10.1021/la301413u] [Citation(s) in RCA: 5] [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: 06/01/2023]
Abstract
Herein, we report the formation of organized mesoporous silica materials prepared from a novel nonionic gemini surfactant, myristoyl-end-capped Jeffamine, synthesized from a polyoxyalkyleneamine (ED900). The behavior of the modified Jeffamine in water was first investigated. A direct micellar phase (L(1)) and a hexagonal (H(1)) liquid crystal were found. The structure of the micelles was investigated from the SAXS and the analysis by generalized indirect Fourier transformation, which show that the particles are globular of core-shell type. The myristoyl chains, located at the ends of the amphiphile molecule, are assembled to form the core of the micelles and, as a consequence, the molecules are folded over on themselves. Mesoporous materials were then synthesized from the self-assembly mechanism. The recovered materials were characterized by SAXS measurements, nitrogen adsorption-desorption analysis, and transmission and scanning electron microscopy. The results clearly evidence that by modifying the synthesis parameters, such as the surfactant/silica precursor molar ratio and the hydrothermal conditions, one can control the size and the nanostructuring of the resulting material. It was observed that, the lower the temperature of the hydrothermal treatment, the better the mesopore ordering.
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Affiliation(s)
- A May
- Université de Lorraine, SRSMC, UMR7565, F-54506 Vandoeuvre-lès-Nancy cedex, France
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Jouaux A, Franco A, Heude-Berthelin C, Sourdaine P, Blin JL, Mathieu M, Kellner K. Identification of Ras, Pten and p70S6K homologs in the Pacific oyster Crassostrea gigas and diet control of insulin pathway. Gen Comp Endocrinol 2012; 176:28-38. [PMID: 22202600 DOI: 10.1016/j.ygcen.2011.12.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 12/05/2011] [Accepted: 12/11/2011] [Indexed: 11/23/2022]
Abstract
Insulin pathways were demonstrated from invertebrates to vertebrates to be involved in the regulation of numerous processes including storage metabolism and reproduction. In addition, insulin system may integrate variations of environmental conditions like dietary restrictions. In the Pacific oyster Crassostrea gigas, reproductive and storage compartments are closely intricated in the gonadal area and their respective development was found to be dependant of trophic conditions. For these reasons, C. gigas is an original and interesting model for investigating the role of insulin control in the balance between storage and reproduction and the integration of environmental parameters. On the basis of sequence conservation, we identified three potential elements of the oyster insulin pathway, Ras, Pten and p70S6K and we investigated their expression levels in various tissues. In the gonadal area, we used laser microdissection in order to precise the targeted contribution of insulin signaling to the restoration of storage tissue and to the control of vitellogenesis. Food deprivation during gametogenesis reinitiation stage led to reduced proliferations of gonia and also to modulate insulin signal by transcriptional activation of insulin pathway elements.
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Affiliation(s)
- A Jouaux
- CNRS-INEE FRE3484 BioMEA Biologie des Mollusques marins et Ecosystèmes associés IFR146 ICORE, Université de Caen Basse-Normandie, F 14032 Caen Cedex, France.
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Ravetti-Duran R, Blin JL, Stébé MJ, Castel C, Pasc A. Tuning the morphology and the structure of hierarchical meso–macroporous silica by dual templating with micelles and solid lipid nanoparticles (SLN). ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm35004a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Michaux F, Blin JL, Teixeira J, Stébé MJ. Structural Investigation of Nonionic Fluorinated Micelles by SANS in Relation to Mesoporous Silica Materials. J Phys Chem B 2011; 116:261-8. [DOI: 10.1021/jp209853r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Florentin Michaux
- Equipe Physico-chimie des Colloïdes, UMR SRSMC N° 7565, Université Nancy-1/CNRS Faculté des Sciences, BP 70239, F-54506 Vandoeuvre-les-Nancy cedex, France
| | - Jean-Luc Blin
- Equipe Physico-chimie des Colloïdes, UMR SRSMC N° 7565, Université Nancy-1/CNRS Faculté des Sciences, BP 70239, F-54506 Vandoeuvre-les-Nancy cedex, France
| | - José Teixeira
- Laboratoire Léon Brillouin (CEA/CNRS), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Marie José Stébé
- Equipe Physico-chimie des Colloïdes, UMR SRSMC N° 7565, Université Nancy-1/CNRS Faculté des Sciences, BP 70239, F-54506 Vandoeuvre-les-Nancy cedex, France
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May A, Stébé MJ, Gutiérrez JM, Blin JL. Coexistence of two kinds of fluorinated hydrogenated micelles as building blocks for the design of bimodal mesoporous silica with two ordered mesopore networks. Langmuir 2011; 27:14000-14004. [PMID: 22043901 DOI: 10.1021/la203753q] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [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
A simple and effective route has been developed for the synthesis of bimodal (3.6 and 9.4 nm) mesoporous silica materials that have two ordered interconnected pore networks. Mesostructures have been prepared through the self-assembly mechanism by using a mixture of polyoxyethylene fluoroalkyl ether and triblock copolymer as building blocks. The investigation of the R(F)(8)(EO)(9)/P123/water phase diagram shows that in the considered surfactant range of concentrations the system is micellar (L(1)). DLS measurements indicate that this micellar phase is composed of two types of micelles; the size of the first one at around 7.6 nm corresponds unambiguously to the pure fluorinated micelles. The second type of micelles at higher diameter consists of fluorinated micelles that have accommodated a weak fraction of P123 molecules. Thus, in this study the bimodal mesoporous silica is really templated by two kinds of micelles.
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Affiliation(s)
- A May
- Chemical Engineering Department, Chemistry Faculty, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Catalonia, Spain
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Mader D, Pillet S, Carteret C, Stébé MJ, Blin JL. Confined Growth of Spin Crossover Nanoparticles in Surfactant-Based Matrices: Enhancing Shape Anisotropy. J DISPER SCI TECHNOL 2011. [DOI: 10.1080/01932691.2011.616173] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Abstract
Water in mesoporous materials possessing a two-dimensional hexagonal structure has been studied by the variation of its NMR longitudinal relaxation time T(1) as a function of the static magnetic field value, or equivalently of the NMR measurement frequency. This technique, dubbed relaxometry, has been applied from 5 kHz (measurement frequency) up to 400 MHz with various instruments including a variable-field spectrometer operating between 8 and 90 MHz. Moreover, the range 0-5 kHz could be investigated by transverse relaxation, T(2) denoting the corresponding relaxation time, and relaxation in the rotating frame, T(1ρ) denoting the corresponding relaxation time. Measurements of proton relaxation rates (inverse of relaxation times) have been performed with H(2)O and HOD (residual protons of heavy water) at water volumes of 80%, 60%, and 40% relative to the porous volume. Comparison between H(2)O and HOD shows clearly that, above 1 MHz where both sets of data are superposed, relaxation is purely intermolecular and due to paramagnetic relaxation (dipolar interactions of water protons with unpaired electrons of paramagnetic entities). Below 1 MHz, it is possible to subtract the intermolecular contribution (given by HOD data) from H(2)O data so that one is left with intramolecular relaxation which is solely due to water reorientational motions. The analysis of these low-frequency data (in terms of Lorentzian functions) reveals two types of water within the pores: one interacting strongly with the surface and the other corresponding to a second layer. High-frequency data, which arise from paramagnetic relaxation, exhibit again two types of water. Due to their correlation times, one type is assigned to relatively free water within the pores while the other type corresponds to bulk (interparticular) water. Their proportions, given as a function of the volume fraction, are consistent with the above assignments.
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Affiliation(s)
- Emilie Steiner
- Méthodologie RMN (CRM2, UMR 7036 CNRS), Nancy-Université, BP 70239, 54506 Vandoeuvre-lès-Nancy Cedex, France
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Henderson MJ, Zimny K, Blin JL, Delorme N, Bardeau JF, Gibaud A. TiO2 thin films self-assembled with a partly fluorinated surfactant template. Langmuir 2010; 26:1124-1129. [PMID: 19754061 DOI: 10.1021/la902224t] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
New TiO(2) films have been self-assembled on solid substrate by dip-coating using TiCl(4) as the titanium source and the partly fluorinated surfactant F(CF(2))(8)C(2)H(4)(OC(2)H(4))(9)OH as the liquid crystal template. By control over the dip-withdrawal speed, film thicknesses from a minimum of 43 nm were produced with rms roughnesses of 0.5-0.7 nm. The films were characterized by X-ray reflectivity, grazing incidence small-angle X-ray scattering, atomic force microscopy, contact angle measurements, and Raman spectroscopy. Their GI-SAXS patterns are characteristic of a 2-D hexagonal structure in which tubular rods of the fluorinated surfactant are packed hexagonally and aligned parallel to the substrate. Reflectivity and contact angle measurements of the as-prepared film indicate that a low-density hydrophilic TiO(2) surface presents to the air.
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Affiliation(s)
- Mark J Henderson
- Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087, Université du Maine, 72085 Le Mans Cedex 09, France
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Zimny K, Ghanbaja J, Carteret C, Stébé MJ, Blin JL. Highly ordered mesoporous titania with semi crystalline framework templated by large or small nonionic surfactants. NEW J CHEM 2010. [DOI: 10.1039/c0nj00488j] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [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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Michaux F, Blin JL, Stébé MJ. Relation between the lower consolute boundary and the structure of mesoporous silica materials. Langmuir 2008; 24:1044-1052. [PMID: 18161998 DOI: 10.1021/la7029104] [Citation(s) in RCA: 7] [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: 05/25/2023]
Abstract
In this study, we have shed some light on the relation between the position of the lower consolute boundary of various nonionic surfactants in water and the structure of the mesoporous silica materials synthesized from these surfactants-based systems. In the first part, the lower consolute boundary was shifted by adding salts. Depending on the features of the phase diagram, we have looked for either a salting out or a salting in effect. Mesoporous materials were prepared from a micellar solution of the investigated surfactants. Results clearly evidenced that the cooperative self-assembly mechanism is not favored if the lower consolute boundary is not shifted toward high temperatures. Moreover, the higher the difference between the phase separation temperature and the temperature at which the silica precursor is added to the surfactant solution, the better the mesopore ordering is. In the second part, this tendency has been confirmed by using a hydrogenated surfactant as additive.
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Affiliation(s)
- F Michaux
- Equipe Physico-chimie des Colloïdes, UMR SRSMC No. 7565, Université Henri Poincaré-Nancy 1/CNRS, Faculté des Sciences, BP 239, F-54506 Vandoeuvre-les-Nancy cedex
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Michaux F, Blin JL, Stébé MJ. Design of ordered bimodal mesoporous silica materials by using a mixed fluorinated-hydrogenated surfactant-based system. Langmuir 2007; 23:2138-44. [PMID: 17279706 DOI: 10.1021/la063103p] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Mesoporous silica materials have been prepared using aqueous solutions of hydrogenated-fluorinated surfactant mixtures. The phase behavior of the C18H35(OC2H4)10-C6F15C2H4(OC2H4)11OH [RH18(EO)10-RF6(EO)11] mixture in aqueous solution was first established at the temperature at which the silica source is added, i.e., 20 or 40 degrees C. We have delimited the different phase domains. Concerning the mesostructured silica, whatever the temperature at which the silica source is added, mesoporous material with a hexagonal array of their channel is formed via a cooperative templating mechanism (CTM), if the content of RF6(EO)11 in the surfactant mixture is lower than 50%. Moreover, when the silica source is added at 40 degrees C, the recovered materials exhibit a bimodal pore size distribution. The appearance of this bimodality has been related to the coexistence of hydrogenated micelles with fluorinated wormlike micelles. By contrast, the bimodality is not observed when the silica source is added at 20 degrees C.
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Affiliation(s)
- F Michaux
- Equipe Physico-chimie des Colloïdes, Faculté des Sciences, UMR SRSMC No. 7565, Université Henri Poincaré-Nancy 1/CNRS, BP 239, F-54506 Vandoeuvre-les-Nancy cedex, France
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Bleta R, Blin JL, Stébé MJ. Solubilization of Various Fluorocarbons in a Fluorinated Surfactant/Water System: Relation with the Design of Porous Materials. J Phys Chem B 2006; 110:23547-56. [PMID: 17107210 DOI: 10.1021/jp0644199] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [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
We have investigated the phase behavior of the R(F)(7)(EO)(8) surfactant in water as well as the effect of the solubilization of various fluorocarbons in this system. Results show that the cloud point (CP) curve is shifted to high temperatures upon addition of fluorocarbons, following the sequence 1-bromo-perfluorooctane (PFOB) < perfluorodecalin (PFD) < perfluorooctane (PFO). The values of the phase inversion temperature (PIT) associated with these systems increase in the same order: PFOB approximately 65 degrees C, PFD approximately 82 degrees C, and PFO > 90 degrees C. Starting from these systems, we have prepared mesoporous and hierarchical porous materials. The formation of the ordered mesoporous materials has been related to the CP curve. Indeed, our results show that mesoporous materials with a high degree of ordering are obtained from systems whose CP curve is shifted toward high temperatures. We have also correlated the formation of the hierarchical porous silica to the PIT. It appears that the design of macro-mesoporous materials is favored with systems that exhibit a high value of the PIT.
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Affiliation(s)
- R Bleta
- Equipe Physico-chimie des Colloïdes, UMR SRSMC N(o) 7565 Université Nancy-1, CNRS, Faculté des Sciences, BP 239, F-54506 Vandoeuvre-les-Nancy Cedex
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Blin JL, Henzel N, Stébé MJ. Mixed fluorinated–hydrogenated surfactant-based system: Preparation of ordered mesoporous materials. J Colloid Interface Sci 2006; 302:643-50. [PMID: 16872623 DOI: 10.1016/j.jcis.2006.07.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2006] [Revised: 06/30/2006] [Accepted: 07/04/2006] [Indexed: 11/20/2022]
Abstract
We have investigated a mixed fluorinated-hydrogenated surfactant-based system [C8F17C2H4(OC2H4)9-C12H25(OC2H4)8] in water. The phase diagram exhibits that the micellar domain can be divided into three parts: above 80 wt% of water both hydrogenated and fluorinated surfactants are completely miscible and they formed mixed micelles in all proportion. When the water concentration is decreased from 80 to 60 wt% a gap of miscibility appears and two micellar zones, one fluorocarbon-rich micelles and one hydrocarbon-rich micelles are observed. The liquid crystal domain is composed of one fluorocarbon-rich (H(F)(1)) and one hydrocarbon-rich (H(H)(1)) hexagonal phase. The hydrophobic radius and the cross-sectional area remain constant in the H(H)(1) and in the H(F)(1) domains. Moreover, SAXS measurements proved that the hydrophobic chains in the liquid crystal phases adopt rather an extended conformation. Then the mixture of surfactants was used as template for the preparation of mesoporous materials. Mesostructured silicas with a well hexagonal array of their channels were prepared via a cooperative templating mechanism (CTM), if the loading of fluorinated surfactant is larger than 50%. Decreasing the proportion of the fluorinated amphiphile in the mixture leads to the formation of mesoporous silica with a disordered structure. In this case the channel arrangement is no longer governed by the fluorinated surfactant but by the hydrogenated one.
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Affiliation(s)
- J L Blin
- Equipe Physico-chimie des Colloïdes UMR SRSMC No. 7565 Université Henri Poincaré - Nancy 1/CNRS, Faculté des Sciences, BP 239, F-54506 Vandoeuvre-les-Nancy cedex, France
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Blin JL, Bleta R, Stébé MJ. Cloud point curve of nonionic surfactant related to the structures of mesoporous materials. J Colloid Interface Sci 2006; 300:765-73. [PMID: 16677667 DOI: 10.1016/j.jcis.2006.04.012] [Citation(s) in RCA: 16] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2006] [Revised: 03/29/2006] [Accepted: 04/02/2006] [Indexed: 11/15/2022]
Abstract
We have investigated the phase behavior of a fluorinated surfactant R(7)(F)(EO)(7) in water. The cloud point is situated at 19 degrees C for 2 wt% of surfactant. Using this surfactant, mesoporous materials have been synthesized with micellar solution prepared either at 10 degrees C (below the cloud point) or at 40 degrees C (above the cloud point). Results show that whatever the syntheses conditions, only wormhole-like structure is recovered. The effect of perfluorodecalin addition on the fluorinated surfactant/water system was also investigated. Swollen micelles, microemulsion, and lamellar (L(alpha)) liquid crystals were identified. When perfluorodecalin is added, the cloud point is shifted toward higher temperature. As regards the mesoporous syntheses, perfluorodecalin plays a dual role. First, incorporation of perfluorodecalin leads to the formation of well ordered materials. Secondly, the pore size enlargement occurs when perfluorodecalin is added. Our results evidence that the ratio between the volume of the hydrophilic headgroup (V(H)) and the hydrophobic part (V(L)) of the surfactant is not an efficiency parameter to explain the ordering improvement of mesoporous materials and that we should rather consider the existence of the cloud point curve, which disturbs the cooperative templating mechanism (CTM).
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Affiliation(s)
- J L Blin
- Equipe Physico-Chimie des Colloïdes, UMR SRSMC 7565, Université Henri Poincaré-Nancy 1/CNRS, Faculté des Sciences, BP 239, F-54506 Vandoeuvre-les-Nancy cedex, France
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Gilles F, Blin JL, Su BL. Transport properties of ammonia in a series of Na+-faujasite zeolites as studied by 2H NMR technique. Colloids Surf A Physicochem Eng Asp 2004. [DOI: 10.1016/j.colsurfa.2004.04.018] [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: 10/26/2022]
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Blin JL, Lesieur P, Stébé MJ. Nonionic fluorinated surfactant: investigation of phase diagram and preparation of ordered mesoporous materials. Langmuir 2004; 20:491-498. [PMID: 15743095 DOI: 10.1021/la035834k] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The behavior of fluorinated surfactant F(CF2)8C2H4(OC2H4)9OH in water solution was investigated, and the preparation ofmesoporous molecular sieves was achieved. A direct micellar phase (L1) and a hexagonal (H1) liquid crystal were found. Small-angle X-ray scattering measurements proved that the hydrophobic chains are completely extended and that the cross sectional area remains constant in H1. At 80 degrees C, materials with a hexagonal array of their channel are prepared via a cooperative templating type mechanism in a wide range of surfactant concentrations (5-20 wt %). Decreasing the hydrothermal temperature leads to the formation ofwormhole-like structure. In this case the channel arrangement is no longer governed by the surfactant behavior but by the silica condensation and polymerization. An increase of the mean pore diameter with heating temperature is noted. This result is associated with changes of aggregation number with temperature. A comparison of the characteristics of the materials obtained with both hydrogenated and fluorinated surfactants is also made.
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Affiliation(s)
- J L Blin
- Equipe Physico-chimie des Colloides, UMR 7565 Université Nancy-1/CNRS, Faculté des Sciences, F-54506 Vandoeuvre-les-Nancy cedex, France.
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Blin JL, Léonard A, Yuan ZY, Gigot L, Vantomme A, Cheetham AK, Su BL. Hierarchically mesoporous/macroporous metal oxides templated from polyethylene oxide surfactant assemblies. Angew Chem Int Ed Engl 2003; 42:2872-5. [PMID: 12833345 DOI: 10.1002/anie.200250816] [Citation(s) in RCA: 198] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jean-Luc Blin
- Laboratory of Inorganic Materials Chemistry, Institute of Studies in Interface Sciences, The University of Namur (FUNDP), 61 rue de Bruxelles, 5000 Namur, Belgium
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Léonard A, Blin JL, Su BL. One-pot surfactant assisted synthesis of aluminosilicate macrochannels with tunable micro- or mesoporous wall structure. Chem Commun (Camb) 2003:2568-9. [PMID: 14594284 DOI: 10.1039/b307720a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [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 one-step surfactant assisted synthesis pathway was developed leading to novel hierarchical macro-meso- (or micro-)porous aluminosilicates made of an assembly of macrochannels with openings between 0.5 and 2.0 microm and wormhole-like amorphous walls with tunable pore sizes.
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Affiliation(s)
- Alexandre Léonard
- Laboratoire de Chimie des Matériaux Inorganiques, The University of Namur (FUNDP), 61, rue de Bruxelles, B-5000 Namur, Belgium
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Yuan ZY, Blin JL, Su BL. Design of bimodal mesoporous silicas with interconnected pore systems by ammonia post-hydrothermal treatment in the mild-temperature range. Chem Commun (Camb) 2002:504-5. [PMID: 12120562 DOI: 10.1039/b200322h] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.9] [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
Bimodal (4 and 8 nm) mesoporous silicas with interconnected three-dimensional structure were synthesized by mild-temperature post-synthesis hydrothermal treatment of MCM-41 mesoporous materials in ammonia solution.
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Affiliation(s)
- Zhong-Yong Yuan
- Laboratory of Inorganic Materials Chemistry, I.S.I.S, University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium
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Abstract
Pigmented villonodular synovitis (PVNS) rarely affects the shoulder. Fewer than 30 cases have been reported in the English and French language literature. In those patients, PVNS was treated by open surgery involving total or local synovectomy, sometimes associated with total shoulder replacement, cuff tear repair, or arthroplastic head resection. The authors report 2 cases of PVNS of the shoulder treated arthroscopically and discuss the advantages and limitations of this technique in the treatment of shoulder PVNS.
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Affiliation(s)
- X Mahieu
- Departments of Orthopaedic Surgery, Bezons Hospital, Paris, France.
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Tabib W, Beaufils P, Blin JL, Trémoulet J, Hardy P. [Arthroscopic meniscectomy with Ho-Yag laser versus mechanical meniscectomy. Mid-term results of a randomized prospective study of 80 meniscectomies]. Rev Chir Orthop Reparatrice Appar Mot 1999; 85:713-21. [PMID: 10612136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
INTRODUCTION The theoretical advantages of the Ho-Yag laser make it the ideal instrument for current use in arthroscopic meniscectomy. Short term results showed less patient discomfort, rapid recovery and less post operative pain and swelling. The purpose of this single blind prospective randomized study was to compare the results of arthroscopic meniscectomy performed mechanically to those obtained with the Ho-Yag laser, with a minimum follow up of one year. MATERIALS AND METHODS Eighty meniscectomies in 76 patients were included with a mean follow up of 19.5 months (extremes 12-35 months). The mean age was 42.5 years (extremes 18-65 years). The laser group included 39 patients while the mechanical group included 37 patients. In the Ho-Yag laser group, energy never exceeded 30 watts. During arthroscopic meniscectomy, no other surgical procedure was allowed i.e. chondroplasty, ligament surgery. Prior to arthroscopy, all patients underwent a clinical evaluation including: Pain and Lysholm score assessment. This was repeated in the post operative period at the 10th, 30th day and at last follow up. 37 patients also had a standard X ray at last follow up (anterior-posterior, lateral, and schuss views). RESULTS No statistically significant difference was observed in global clinical results between both techniques. Even if mechanical meniscectomy showed better results, the laser remained best when used in degenerative medial meniscal tears with minimal cartilaginous lesions. In degenerative medial meniscal tears with severe cartilaginous lesions, mechanical meniscectomy showed significantly better results (p = 0.048). X ray control was normal in 47 p. 100 of the laser group and in 80 p. 100 of the mechanical group. The difference was statistically significant (p = 0.038). Narrowing of the joint space was observed in 45 p. 100 of laser group and in 18 p. 100 of mechanical group. Iterative arthroscopy was necessary in 4 cases (3 laser and 1 mechanical) for residual pain. Severe chondrolysis was present in 2 cases following laser meniscectomy. In the 2 other cases a complement of meniscectomy for residual lesions allowed good results. No bony necrosis was observed after laser meniscectomy. CONCLUSION According to the results of this study and the high cost of the laser, we do not recommend the laser as a routine technique for arthroscopic meniscectomy.
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Affiliation(s)
- W Tabib
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital A. Mignot, Le Chesnay
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Abstract
The authors report a rare case of dorsal dislocation of the radiocarpal joint without any bony lesion associated. The traumatic cause was a high energy motorbike accident. Fractures of the other limbs were associated. The authors report the clinical, radiological, and arthroscopic features. Wrist arthroscopy showed a complete tear of all the extrinsic ligaments, a radial avulsion of the triangular fibrocartilage complex, and the integrity of the intracarpal ligaments, which guided the treatment. The dislocation was treated by closed reduction and radiocarpal pinning. The authors propose wrist arthroscopy in radiocarpal dislocation for diagnosis of soft tissue and cartilaginous lesions to guide the treatment (close or open).
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Affiliation(s)
- P Hardy
- Service de Chirurgie Orthopédique et Traumatologique, Hopital Ambroise Paré, CHU Paris-Ouest, Faculté de Médecine Paris V. Boulogne, France.
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Cassard X, Beaufils P, Blin JL, Hardy P. [Osteosynthesis under arthroscopic control of separated tibial plateau fractures. 26 case reports]. Rev Chir Orthop Reparatrice Appar Mot 1999; 85:257-66. [PMID: 10422131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
PURPOSE OF THE STUDY Arthroscopic treatment of tibial plateau fractures may reduce morbidity compared to open articular surgery. But bony fixation is necessarily percutaneous and minimal. The purpose of our study was not only to assess immediate results but also long term functional and anatomic results after arthroscopic treatment of tibial plateau fractures, with special reference to radiographical results. MATERIAL AND METHODS Twenty-six patients (mean age 42 years, range 18 to 70 years, 17 men, 9 women) were arthroscopically treated for a fresh tibial plateau fracture. According to Schatzker classification, there was 2 type I, 17 type II, 6 type III and 1 type IV. No type V or VI were treated in this series. The fixation device was: percutaneous cannulated screw in 23 cases, Kirchner wire in 2 cases, and bone cement filing of the fracture site in 1 case. We did not use cancellous bone graft but we used a hydroxyapatite plug in one case. There were 8 meniscal injuries: 2 underwent arthroscopic suture, 1 had partial meniscectomy and 5 were left in place. Twenty-six cases were suitable for immediate post op follow up. 19 were reviewed at long term. A clinical (Knee Society scoring system) and radiographical examination were done with an average follow-up of 32.7 months. RESULTS There were no complications except one immediate postoperative septic osteoarthritis (case with hydroxyapatite plug) and one bony depression of the lateral tibial plateau at the fourth month. Passive motion of the knee started at 1.8 days postop with no pain. Mean flexion at 3 months was 130 degrees. At revision, the average score was: 94.1 for the knee, 94.7 for the function. In two cases we found early signs of osteoarthrosis. There were no secondary bony depression or significant valgus deformity on X-rays. CONCLUSION Arthroscopic management of tibial plateau fractures allows a complete articular screening. Rapid rehabilitation, short hospital stay, and low rate of complications reduce morbidity. The long term results are as good as those with open surgical technique for the types of fracture that we have treated (type III and IV). A minimal, percutaneous osteosynthesis which was the only possibility under arthroscopic control, did not modify the anatomical results.
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Affiliation(s)
- X Cassard
- Service de Chirurgie Orthopédique et Traumatologique, Centre Hospitalier de Versailles, Le Chesnay
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Hardy P, Thabit G, Fanton GS, Blin JL, Lortat-Jacob A, Benoit J. [Arthroscopic management of recurrent anterior shoulder dislocation by combining a labrum suture with antero-inferior holmium:YAG laser capsular shrinkage]. Orthopade 1996; 25:91-3. [PMID: 8622852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Current arthroscopic treatments do not address satisfactorily the capsular redundancy frequently associated with the Bankart lesion in recurrent anterior dislocation. Although the Bankart lesion heals, many of the recurrences after arthroscopic procedures are due to capsular redundancy and the laxity of glenohumeral ligaments. We propose that laser-assisted capsular shrinkage (LACS) be combined with arthroscopic labrum reattachment. As shown by Market et al., significant capsular shrinkage can be achieved by the application of non-ablative Ho:YAG laser energy without detrimental effects to the relaxation properties of the tissue. For 1 year we have used LACS together with labrum suture in 18 shoulders in 18 patients (mean age 24.6 years). All patients suffered from chronic anterioinferior recurrent dislocation. The labrum suture was realized by an anterior reattachment (REVO screws, Linvatec, USA) or by transglenoid suture. Two or three sutures were passed through the torn labrum with 2/0 non-absorbable suture material. The LACS procedure was performed with a holmium:YAG laser (VersaPulse, Coherent, USA) at an energy of 10 W (1 J, 10 Hz) with a 30 degrees curved handpiece. All patients were immobilized in a sling for 4 weeks postoperatively. Physical therapy was begun at 1 month with passive and active exercise. To date, none of the patients have had a recurrence. Seven of 18 patients returned to their previous sports activity, and at the same level. None of the patients had an iatrogenic lesion due to the laser application or labrum suture. Compared to the other shoulder, the loss of external rotation with the arm 90 degrees abducted was 30 degrees at 4 weeks and 10 degrees at 4 months. We think that the LACS procedure is a good treatment for the capsular redundancy that is frequently associated with Bankart's lesion in recurrent anterior dislocation and is probably responsible for the high failure rate in current arthroscopic procedures. Our results are short-term results, but we expect the capsular shrinkage associated with the labrum reattachment will provide a long-term success rate that is comparable to open procedures.
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Affiliation(s)
- P Hardy
- Service de Chirurgie Orthopédique, Hôpital Ambroise Paré, C.H.U. Paris Ouest, Boulogne
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