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Hou W, Zhang Z, Shi Y, Chen Y. Co-Assembly of Diblock Copolymers and Molecular Bottlebrushes. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wangmeng Hou
- School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen University, Guangzhou 510006, China
| | - Zhen Zhang
- School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen University, Guangzhou 510006, China
| | - Yi Shi
- School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen University, Guangzhou 510006, China
| | - Yongming Chen
- School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen University, Guangzhou 510006, China
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2
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Decarpigny C, Bleta R, Ponchel A, Monflier E. Oxidation of 2,5-diformfylfuran to 2,5-furandicarboxylic acid catalyzed by Candida antarctica Lipase B immobilized in a cyclodextrin-templated mesoporous silica. The critical role of pore characteristics on the catalytic performance. Colloids Surf B Biointerfaces 2021; 200:111606. [PMID: 33601112 DOI: 10.1016/j.colsurfb.2021.111606] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/20/2021] [Accepted: 01/22/2021] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS Porous silica has been extensively used as suitable carrier for the immobilization of various enzymes. Randomly Methylated β-Cyclodextrin (RaMeβCD) has surface active properties and very high solubility in water and could therefore be used as template in the fabrication of silica particles with tunable pore size. EXPERIMENTS Silica particles were prepared by sol-gel process in alkaline medium with and without use of RaMeβCD. Lipase Bfrom Candida antarctica (CALB) was either incorporated within the pores of RaMeβCD-derived support or covalently attached on the surface of CD-free silica particles and its catalytic performance was assayed in the oxidation of 2,5-diformylfuran (DFF) to 2,5-furandicarboxylic acid (FDCA). Enzymatic reactors were characterized by N2-adsorption analysis, small angle XRD, TG/DSC experiments, ATR-FTIR spectroscopy, HR-TEM and LSCM, while reaction products were determined based on 1H NMR spectroscopy combined with HPLC. FINDINGS Results showed that the use of RaMeβCD as structure directing agent led to mesoporous silica composed of uniform 8 nm-sized particles with 11 nm-sized mesopores compatible with the dimensions of CALB (3.0 nm × 4.0 nm × 5.0 nm). Incorporation of CALB within the pores of RaMeβCD-derived silica caused almost a two-fold increase in specific activity after 7 h at 40 °C when compared to lipase immobilized on the surface of CD-free silica particles (33.2 μmol g-1 min-1vs. 14.4 μmol g-1 min-1). Moreover, the RaMeβCD-derived biocatalyst demonstrated enhanced operational stability during the recycling experiments, retaining more than 90% of its initial activity after five 24 h-reaction cycles. These findings open up new avenues for future research on the use of cyclodextrins in the development of enzyme-based nanoreactors.
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Affiliation(s)
- Cédric Decarpigny
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300, Lens, France
| | - Rudina Bleta
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300, Lens, France.
| | - Anne Ponchel
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300, Lens, France
| | - Eric Monflier
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300, Lens, France
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3
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Decarpigny C, Noël S, Addad A, Ponchel A, Monflier E, Bleta R. Robust Ruthenium Catalysts Supported on Mesoporous Cyclodextrin-Templated TiO 2-SiO 2 Mixed Oxides for the Hydrogenation of Levulinic Acid to γ-Valerolactone. Int J Mol Sci 2021; 22:1721. [PMID: 33572104 PMCID: PMC7915766 DOI: 10.3390/ijms22041721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 11/17/2022] Open
Abstract
In this paper, we present a versatile template-directed colloidal self-assembly method for the fabrication in aqueous phase of composition-tuned mesoporous RuO2@TiO2-SiO2 catalysts. Randomly methylated β-cyclodextrin/Pluronic F127 supramolecular assemblies were used as soft templates, TiO2 colloids as building blocks, and tetraethyl orthosilicate as a silica source. Catalysts were characterized at different stages of their synthesis using dynamic light scattering, N2-adsorption analysis, powder X-ray diffraction, temperature programmed reduction, high-resolution transmission electron microscopy, high-angle annular bright-field and dark-field scanning transmission electron microscopy, together with EDS elemental mapping. Results revealed that both the supramolecular template and the silica loading had a strong impact on the pore characteristics and crystalline structure of the mixed oxides, as well as on the morphology of the RuO2 nanocrystals. Their catalytic performance was then evaluated in the aqueous phase hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) under mild conditions (50 °C, 50 bar H2). Results showed that the cyclodextrin-derived catalyst displayed almost quantitative LA conversion and 99% GVL yield in less than one hour. Moreover, this catalyst could be reused at least five times without loss of activity. This work offers an effective approach to the utilization of cyclodextrins for engineering the surface morphology of Ru nanocrystals and pore characteristics of TiO2-based materials for catalytic applications in hydrogenation reactions.
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Affiliation(s)
- Cédric Decarpigny
- University Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France; (C.D.); (S.N.); (A.P.); (E.M.)
| | - Sébastien Noël
- University Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France; (C.D.); (S.N.); (A.P.); (E.M.)
| | - Ahmed Addad
- University Lille, CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux et Transformations, F-59000 Lille, France;
| | - Anne Ponchel
- University Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France; (C.D.); (S.N.); (A.P.); (E.M.)
| | - Eric Monflier
- University Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France; (C.D.); (S.N.); (A.P.); (E.M.)
| | - Rudina Bleta
- University Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France; (C.D.); (S.N.); (A.P.); (E.M.)
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4
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Puig-Rigall J, Serra-Gómez R, Guembe-Michel N, Grillo I, Dreiss CA, González-Gaitano G. Threading Different Rings on X-Shaped Block Copolymers: Hybrid Pseudopolyrotaxanes of Cyclodextrins and Tetronics. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joan Puig-Rigall
- Departamento de Química, Universidad de Navarra, 31080 Pamplona, Spain
| | | | | | - Isabelle Grillo
- Institut Laue-Langevin, 71 Avenue des Martyrs, B.P. 156, 38042 Grenoble Cedex, France
| | - Cécile A. Dreiss
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, SE1 9NH London, U.K
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5
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Decarpigny C, Bleta R, Ponchel A, Monflier E. Confinement of Candida Antarctica Lipase B in a Multifunctional Cyclodextrin-Derived Silicified Hydrogel and Its Application as Enzymatic Nanoreactor. ACS APPLIED BIO MATERIALS 2019; 2:5568-5581. [PMID: 35021552 DOI: 10.1021/acsabm.9b00646] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Supramolecular hydrogels with a three-dimensional cross-linked macromolecular network have attracted growing scientific interest in recent years because of their ability to incorporate high loadings of bioactive molecules such as drugs, proteins, antibodies, peptides, and genes. Herein, we report a versatile approach for the confinement of Candida antarctica lipase B (CALB) within a silica-strengthened cyclodextrin-derived supramolecular hydrogel and demonstrate its potential application in the selective oxidation of 2,5-diformylfuran (DFF) to 2,5-furandicarboxylic acid (FDCA) under mild conditions. The enzymatic nanoreactor was deeply characterized using thermogravimetric analysis, Fourier transform infrared spectroscopy, N2-adsorption, dynamic light scattering, UV-visible spectroscopy, transmission electron microscopy, scanning electron microscopy, and confocal laser scanning microscopy, while the reaction products were established on the basis of 1H nuclear magnetic resonance spectroscopy combined with high-performance liquid chromatography. Our results revealed that while CALB immobilized in conventional sol-gel silica yielded exclusively 5-formylfuran-2-carboxylic acid (FFCA), confinement of the enzyme in the silicified hydrogel imparted a 5-fold increase in DFF conversion and afforded 67% FDCA yield in 7 h and almost quantitative yields in less than 24 h. The hierarchically interconnected pore structure of the host matrix was found to provide a readily accessible diffusion path for reactants and products, while its flexible hydrophilic-hydrophobic interface was extremely beneficial for the interfacial activation of the immobilized lipase.
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Affiliation(s)
- Cédric Decarpigny
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France
| | - Rudina Bleta
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France
| | - Anne Ponchel
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France
| | - Eric Monflier
- Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-62300 Lens, France
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6
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Puig-Rigall J, Serra-Gómez R, Stead I, Grillo I, Dreiss CA, González-Gaitano G. Pseudo-Polyrotaxanes of Cyclodextrins with Direct and Reverse X-Shaped Block Copolymers: A Kinetic and Structural Study. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02509] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Joan Puig-Rigall
- Departamento de Química, Universidad de Navarra, 31080 Pamplona, Spain
| | | | - Ian Stead
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Isabelle Grillo
- Institut
Laue-Langevin, 71 avenue des Martyrs, B.P. 156, Cedex 38042 Grenoble, France
| | - Cécile A. Dreiss
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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7
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Bleta R, Schiavo B, Corsaro N, Costa P, Giaconia A, Interrante L, Monflier E, Pipitone G, Ponchel A, Sau S, Scialdone O, Tilloy S, Galia A. Robust Mesoporous CoMo/γ-Al 2O 3 Catalysts from Cyclodextrin-Based Supramolecular Assemblies for Hydrothermal Processing of Microalgae: Effect of the Preparation Method. ACS APPLIED MATERIALS & INTERFACES 2018; 10:12562-12579. [PMID: 29578684 DOI: 10.1021/acsami.7b16185] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hydrothermal liquefaction (HTL) is a promising technology for the production of biocrude oil from microalgae. Although this catalyst-free technology is efficient under high-temperature and high-pressure conditions, the biocrude yield and quality can be further improved by using heterogeneous catalysts. The design of robust catalysts that preserve their performance under hydrothermal conditions will be therefore very important in the development of biorefinery technologies. In this work, we describe two different synthetic routes (i.e., impregnation and cyclodextrin-assisted one-pot colloidal approach), for the preparation in aqueous phase of six high surface area CoMo/γ-Al2O3 catalysts. Catalytic tests performed on the HTL of Nannochloropsis gaditana microalga indicate that solids prepared by the one-pot colloidal approach show higher hydrothermal stability and enhanced biocrude yield with respect to the catalyst-free test. The positive effect of the substitution of the block copolymer Tetronic T90R4 for Pluronic F127 in the preparation procedure was evidenced by diffuse reflectance UV-visible spectroscopy, X-ray diffraction, N2-adsorption-desorption, and H2-temperature-programmed reduction measurements and confirmed by the higher quality of the obtained biocrude, which exhibited lower oxygen content and higher-energy recovery equal to 62.5% of the initial biomass.
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Affiliation(s)
- Rudina Bleta
- Univ. Artois , CNRS, Centrale Lille, ENSCL, Univ. Lille , UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Benedetto Schiavo
- Dipartimento del l'Innovazione Industriale e Digitale-Ingegneria Chimica, Gestionale, Informatica , Meccanica (DIID) Università di Palermo Viale delle Scienze , Ed 6 , 90128 Palermo , Italy
| | - Natale Corsaro
- ENEA-Casaccia Research Center Via Anguillarese 301 , I-00123 Rome , Italy
| | - Paula Costa
- Laboratório Nacional de Energia e Geologia (LNEG) Estrada do Paço do Lumiar , 22 , 1649-038 Lisbon , Portugal
| | - Alberto Giaconia
- ENEA-Casaccia Research Center Via Anguillarese 301 , I-00123 Rome , Italy
| | - Leonardo Interrante
- Dipartimento del l'Innovazione Industriale e Digitale-Ingegneria Chimica, Gestionale, Informatica , Meccanica (DIID) Università di Palermo Viale delle Scienze , Ed 6 , 90128 Palermo , Italy
| | - Eric Monflier
- Univ. Artois , CNRS, Centrale Lille, ENSCL, Univ. Lille , UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Giuseppe Pipitone
- Univ. Artois , CNRS, Centrale Lille, ENSCL, Univ. Lille , UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
- Dipartimento del l'Innovazione Industriale e Digitale-Ingegneria Chimica, Gestionale, Informatica , Meccanica (DIID) Università di Palermo Viale delle Scienze , Ed 6 , 90128 Palermo , Italy
| | - Anne Ponchel
- Univ. Artois , CNRS, Centrale Lille, ENSCL, Univ. Lille , UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Salvatore Sau
- ENEA-Casaccia Research Center Via Anguillarese 301 , I-00123 Rome , Italy
| | - Onofrio Scialdone
- Dipartimento del l'Innovazione Industriale e Digitale-Ingegneria Chimica, Gestionale, Informatica , Meccanica (DIID) Università di Palermo Viale delle Scienze , Ed 6 , 90128 Palermo , Italy
| | - Sébastien Tilloy
- Univ. Artois , CNRS, Centrale Lille, ENSCL, Univ. Lille , UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS) , F-62300 Lens , France
| | - Alessandro Galia
- Dipartimento del l'Innovazione Industriale e Digitale-Ingegneria Chimica, Gestionale, Informatica , Meccanica (DIID) Università di Palermo Viale delle Scienze , Ed 6 , 90128 Palermo , Italy
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8
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Tomer A, Wyrwalski F, Przybylski C, Paul JF, Monflier E, Pera-Titus M, Ponchel A. Facile preparation of Ni/Al2O3 catalytic formulations with the aid of cyclodextrin complexes: Towards highly active and robust catalysts for the direct amination of alcohols. J Catal 2017. [DOI: 10.1016/j.jcat.2017.10.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Puig-Rigall J, Grillo I, Dreiss CA, González-Gaitano G. Structural and Spectroscopic Characterization of TPGS Micelles: Disruptive Role of Cyclodextrins and Kinetic Pathways. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4737-4747. [PMID: 28412819 DOI: 10.1021/acs.langmuir.7b00701] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The aggregation and structure of d-α-tocopheryl polyethylene glycol succinate micelles, TPGS-1000, an amphiphilic derivative of vitamin E, were characterized using scattering and spectroscopic methods, and the impact of different cyclodextrins (CDs) on the self-assembly was investigated, with the view of combining these two versatile pharmaceutical excipients in drug formulations. Combined small-angle neutron scattering (SANS), dynamic light scattering, and time-resolved and steady-state fluorescence emission experiments revealed a core-shell architecture with a high aggregation number (Nagg ≈ 100) and a highly hydrated poly(ethylene oxide) corona (∼11 molecules of solvent per ethylene oxide unit). Micelles form gradually, with no sharp onset. Structural parameters and hydration of the aggregates were surprisingly stable with both temperature and concentration, which is a critical advantage for their use in pharmaceutical formulations. CDs were shown to affect the self-assembly of TPGS in different ways. Whereas native CDs induced the precipitation of a solid complex (pseudopolyrotaxane), methylated β-CDs led to different outcomes: constructive (micellar expansion), destructive (micellar rupture), or no effect, depending on the number of substituents and whether the substitution pattern was regular or random on the rims of the macrocycle. Time-resolved SANS studies on mixtures of TPGS with regularly dimethylated β-CD (DIMEB), which ruptures the micelles, revealed an almost instantaneous demicellization (<100 ms) and showed that the process involved the formation of large aggregates whose size evolved over time. Micellar rupture is caused by the formation of a TPGS-DIMEB inclusion complex, involving the incorporation of up to three macrocycles on the tocopherol, as shown by proton nuclear magnetic resonance (NMR) and ROESY NMR. Analysis of NMR data using Hill's equation revealed that the binding is rather cooperative, with the threading of the CD favoring the subsequent inclusion of additional CDs on the aliphatic moiety.
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Affiliation(s)
- Joan Puig-Rigall
- Departamento de Química, Universidad de Navarra , 31080 Pamplona, Spain
| | - Isabelle Grillo
- Institut Laue-Langevin , 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex, France
| | - Cécile A Dreiss
- Institute of Pharmaceutical Science, King's College London , Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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Ren L, Li X, He H. Alumina Particles Are Snowballing with Propylene Oxide-Synthesis of Alumina Aerogels with Free Adjustable Particle and Pore Sizes. ChemistrySelect 2016. [DOI: 10.1002/slct.201600142] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lili Ren
- School of Chemistry & Chemical Engineering; Southeast University; Nanjing 211189 China
| | - Xueai Li
- School of Chemistry & Chemical Engineering; Southeast University; Nanjing 211189 China
| | - He He
- School of Chemistry & Chemical Engineering; Southeast University; Nanjing 211189 China
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11
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Bleta R, Noël S, Addad A, Ponchel A, Monflier E. Mesoporous RuO2/TiO2 composites prepared by cyclodextrin-assisted colloidal self-assembly: towards efficient catalysts for the hydrogenation of methyl oleate. RSC Adv 2016. [DOI: 10.1039/c5ra27161d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
CD-based assemblies give rise to mesoporous Ru/TiO2 catalysts with enhanced catalytic activity, selectivity, ease of recovery and reusability.
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Affiliation(s)
| | | | - Ahmed Addad
- Univ. Lille
- CNRS
- INRA
- ENSCL
- UMR 8207 – UMET – Unité Matériaux et Transformations
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12
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Qi R, Jin Y, Cheng X, Fan B, Sun T, Peng S, Li H. Crystallization-Driven Self-Assembly of Rod-Coil-Rod Pseudopolyrotaxanes into Spherical Micelles, Nanorods, and Nanorings in Aqueous Solutions. Macromol Rapid Commun 2015; 36:1402-8. [PMID: 25990437 DOI: 10.1002/marc.201500129] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 04/02/2015] [Indexed: 11/12/2022]
Abstract
A novel rod-containing block copolymer is constructed by supramacromolecular self-assembly of α-cyclodextrin and a triblock copolymer with methoxy polyethylene glycol as the flanking chains and the midterm block alternately connected by 2,2-dimethylolbutyric acid and isophorone diisocyanate. The assembled rod-containing block copolymer shows an exciting phenomenon of concentration- and pH-dependent morphological switching of well-defined nanostructures. In the solutions at pH 9.2, spherical micelles, rod-like micelles, and hydrogel are observed successively with an increase of the concentration. Notably, the rod-like micelles are composed of spherical segments due to the combination of the crystalline cores of the spherical micelles. In addition, 1D nanostructures with different curvatures from linear rod-like micelles (pH 9.2) to ring-shaped micelles (pH 7.5) can be obtained by controlling the pH values of the assembled systems.
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Affiliation(s)
- Rui Qi
- Center of Polymer Science and Technology, Chengdu Institute of Organic Chemistry, Chinese Academy of Science, Chengdu, 610041, China.,University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
| | - Yong Jin
- National Engineering Laboratory for Clean Technology of Leather, Manufacture, Sichuan University, Chengdu, 610065, China.,Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, 610065, China
| | - Xinfeng Cheng
- Center of Polymer Science and Technology, Chengdu Institute of Organic Chemistry, Chinese Academy of Science, Chengdu, 610041, China.,University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
| | - Baozhu Fan
- Center of Polymer Science and Technology, Chengdu Institute of Organic Chemistry, Chinese Academy of Science, Chengdu, 610041, China.,University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
| | - Tongbing Sun
- Center of Polymer Science and Technology, Chengdu Institute of Organic Chemistry, Chinese Academy of Science, Chengdu, 610041, China.,University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
| | - Shaojun Peng
- Center of Polymer Science and Technology, Chengdu Institute of Organic Chemistry, Chinese Academy of Science, Chengdu, 610041, China.,University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
| | - Hanping Li
- National Engineering Laboratory for Clean Technology of Leather, Manufacture, Sichuan University, Chengdu, 610065, China.,Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, 610065, China
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13
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González-Gaitano G, Müller C, Radulescu A, Dreiss CA. Modulating the self-assembly of amphiphilic X-shaped block copolymers with cyclodextrins: structure and mechanisms. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4096-4105. [PMID: 25785814 DOI: 10.1021/acs.langmuir.5b00334] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Inclusion complexes between cyclodextrins and polymers-so-called pseudopolyrotaxanes (PPR)-are at the origin of fascinating supramolecular structures, which are finding increasing uses in biomedical and technological fields. Here we explore the impact of both native and a range of modified cyclodextrins (CD) on the self-assembly of X-shaped poly(ethylene oxide)-poly(propylene oxide) block copolymers, so-called Tetronics or poloxamines, by focusing on Tetronic 904 (T904, Mw 6700). The effects are markedly dependent on the type and arrangement of the substituents on the macrocycle. While native CDs drive the formation of a solid PPR, most substituted CDs induce micellar breakup, with dimethylated β-CD (DIMEB) having the strongest impact and randomly substituted CDs a much weaker disruptive effect. Using native α-CD as a "molecular trap", we perform competitive binding experiments-where two types of CDs thread together onto the polymer chains-to establish that DIMEB indeed has the highest propensity to form an inclusion complex with the polymer, while hydroxypropylated CDs do not thread. 1D (1)H NMR and ROESY experiments confirm the formation of a soluble PPR with DIMEB in which the CD binds preferentially to the PO units, thus providing the drive for the observed demicellization. A combination of dynamic light scattering (DLS) and small-angle neutron scattering (SANS) is used to extract detailed structural parameters on the micelles. A binding model is proposed, which exploits the chemical shifts of selected protons from the CD in conjunction with the Hill equation, to prove that the formation of the PPR is a negatively cooperative process, in which threaded DIMEBs hamper the entrance of subsequent macrocycles.
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Affiliation(s)
- Gustavo González-Gaitano
- †Departamento de Química y Edafología, Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Spain
| | - Céline Müller
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Aurel Radulescu
- §Jülich Center for Neutron Science, JCNS Outstation at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstraße 1,85747 Garching, Germany
| | - Cécile A Dreiss
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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14
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Mi H, Zhou J, Zhao Z, Yu C, Wang X, Qiu J. Block copolymer-guided fabrication of shuttle-like polyaniline nanoflowers with radiating whiskers for application in supercapacitors. RSC Adv 2015. [DOI: 10.1039/c4ra10273h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Superfine shuttle-shaped polyaniline (PANI) nanoflowers with radiating whiskers have been prepared by block copolymer-assisted microemulsion method, and exhibited high rate capability and good cycling performance.
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Affiliation(s)
- Hongyu Mi
- Xinjiang Laboratory of Advanced Functional Materials
- School of Chemistry and Chemical Engineering
- Xinjiang University
- Urumqi 830046
- China
| | - Jiapan Zhou
- Xinjiang Laboratory of Advanced Functional Materials
- School of Chemistry and Chemical Engineering
- Xinjiang University
- Urumqi 830046
- China
| | - Zongbin Zhao
- Carbon Research Laboratory
- School of Chemical Engineering
- State Key Lab of Fine Chemicals
- Dalian University of Technology
- Dalian 116023
| | - Chang Yu
- Carbon Research Laboratory
- School of Chemical Engineering
- State Key Lab of Fine Chemicals
- Dalian University of Technology
- Dalian 116023
| | - Xuzhen Wang
- Carbon Research Laboratory
- School of Chemical Engineering
- State Key Lab of Fine Chemicals
- Dalian University of Technology
- Dalian 116023
| | - Jieshan Qiu
- Carbon Research Laboratory
- School of Chemical Engineering
- State Key Lab of Fine Chemicals
- Dalian University of Technology
- Dalian 116023
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15
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Bleta R, Lannoy A, Machut C, Monflier E, Ponchel A. Understanding the role of cyclodextrins in the self-assembly, crystallinity, and porosity of titania nanostructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:11812-22. [PMID: 25222478 DOI: 10.1021/la502911v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A series of mesoporous titania photocatalysts with tailorable structural and textural characteristics was prepared in aqueous phase via a colloidal self-assembly approach using various cyclodextrins (CDs) as structure-directing agents. The photocatalysts and the structure-directing agents were characterized at different stages of the synthesis by combining X-ray diffraction, N2-adsorption, field emission scanning electron microscopy, transmission electron microscopy, UV-visible spectroscopy, dynamic light scattering, and surface tension measurements. The results demonstrate that the cyclic macromolecules efficiently direct the self-assembly of titania colloids, resulting in a fine-tuning of the crystal phase composition, crystallite size, surface area, particle morphology, pore volume, and pore size. Depending on the chemical nature of the substituents in the cyclodextrin ring, synergistic or competitive effects arising from the adsorption capacity of these cyclic oligosaccharides onto titania surface, surface-active properties, and ability to aggregate in water by intermolecular interactions were found to substantially impact the characteristics of the final material. We propose that, in contrast to the native cyclodextrins, which tend to favor the local agglomeration of titania nanoparticles due to the strong intermolecular interactions, the substitution of hydroxyl groups by a relatively large number of methoxyl or 2-hydropropoxyl ones in the β-CD derivatives allows for creating smoother interfaces, thus facilitating the self-assembly of the colloids in a more homogeneous network. The photocatalytic activity of those titania materials was evaluated in the photodegradation of a toxic herbicide, phenoxyacetic acid, and was correlated to the structural and textural characteristics of the photocatalysts.
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Affiliation(s)
- Rudina Bleta
- UCCS, UMR-CNRS 8181, Faculté des Sciences Jean Perrin, Université d'Artois , Rue Jean Souvraz, SP 18, F-62307 Lens, France
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16
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Bleta R, Machut C, Léger B, Monflier E, Ponchel A. Investigating the effect of randomly methylated β-cyclodextrin/block copolymer molar ratio on the template-directed preparation of mesoporous alumina with tailored porosity. J INCL PHENOM MACRO 2014. [DOI: 10.1007/s10847-014-0405-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Lannoy A, Bleta R, Machut C, Monflier E, Ponchel A. Block copolymer–cyclodextrin supramolecular assemblies as soft templates for the synthesis of titania materials with controlled crystallinity, porosity and photocatalytic activity. RSC Adv 2014. [DOI: 10.1039/c4ra05994h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The supramolecular assemblies formed between randomly methylated β-cyclodextrin and block copolymer give rise to nanostructured titania with enhanced photocatalytic activity.
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Affiliation(s)
- Anthony Lannoy
- Université d'Artois
- UCCS
- UMR-CNRS 8181
- Faculté des Sciences Jean Perrin
- F-62307 Lens, France
| | - Rudina Bleta
- Université d'Artois
- UCCS
- UMR-CNRS 8181
- Faculté des Sciences Jean Perrin
- F-62307 Lens, France
| | - Cécile Machut
- Université d'Artois
- UCCS
- UMR-CNRS 8181
- Faculté des Sciences Jean Perrin
- F-62307 Lens, France
| | - Eric Monflier
- Université d'Artois
- UCCS
- UMR-CNRS 8181
- Faculté des Sciences Jean Perrin
- F-62307 Lens, France
| | - Anne Ponchel
- Université d'Artois
- UCCS
- UMR-CNRS 8181
- Faculté des Sciences Jean Perrin
- F-62307 Lens, France
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