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Bianco A, Bonchio M, Bonifazi D, Da Ros T, Maggini M, Mateo-Alonso A, Tecilla P. Celebrating Maurizio Prato's Passion, Talent and Imagination. Chemistry 2024; 30:e202400127. [PMID: 38446047 DOI: 10.1002/chem.202400127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Indexed: 03/07/2024]
Abstract
This Editorial introduces a Special Collection of papers dedicated to Maurizio Prato, featuring prominent examples of his team's efforts to integrate complex frontier research with pioneering achievements in the field of carbon nanostructures and molecular nanoscience.
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Affiliation(s)
- Alberto Bianco
- CNRS, UPR3572, Immunology, Immunopathology and Therapeutic Chemistry, University of Strasbourg, ISIS, 67000, Strasbourg, France
| | - Marcella Bonchio
- Department of Chemical Sciences, University of Padova, Via F. Marzolo 1, 35131, Padova, Italy
| | - Davide Bonifazi
- Institut für Organische Chemie, Universität Wien, Währinger Strasse 38, 1090, Wien, Austria
| | - Tatiana Da Ros
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via L. Giorgieri 1, 34127, Trieste, Italy
| | - Michele Maggini
- Department of Chemical Sciences, University of Padova, Via F. Marzolo 1, 35131, Padova, Italy
| | - Aurelio Mateo-Alonso
- POLYMAT, University of the Basque Country UPV/EHU Avenida de, Tolosa 72, 20018, Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, 48009, Bilbao, Spain
| | - Paolo Tecilla
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via L. Giorgieri 1, 34127, Trieste, Italy
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Chalmpes N, Patila M, Kouloumpis A, Alatzoglou C, Spyrou K, Subrati M, Polydera AC, Bourlinos AB, Stamatis H, Gournis D. Graphene Oxide-Cytochrome c Multilayered Structures for Biocatalytic Applications: Decrypting the Role of Surfactant in Langmuir-Schaefer Layer Deposition. ACS APPLIED MATERIALS & INTERFACES 2022; 14:26204-26215. [PMID: 35608556 DOI: 10.1021/acsami.2c03944] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Graphene, a two-dimensional single-layer carbon allotrope, has attracted tremendous scientific interest due to its outstanding physicochemical properties. Its monatomic thickness, high specific surface area, and chemical stability render it an ideal building block for the development of well-ordered layered nanostructures with tailored properties. Herein, biohybrid graphene-based layer-by-layer structures are prepared by means of conventional and surfactant-assisted Langmuir-Schaefer layer deposition techniques, whereby cytochrome c molecules are accommodated within ordered layers of graphene oxide. The biocatalytic activity of the as-developed nanobio-architectures toward the enzymatic oxidation of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt and decolorization of pinacyanol chloride is tested. The results show that the multilayer structures exhibit high biocatalytic activity and stability in the absence of surfactant molecules during the deposition of the monolayers.
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Affiliation(s)
- Nikolaos Chalmpes
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Michaela Patila
- Laboratory of Biotechnology, Department of Biological Applications and Technology, University of Ioannina, 45110 Ioannina, Greece
| | - Antonios Kouloumpis
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Christina Alatzoglou
- Laboratory of Biotechnology, Department of Biological Applications and Technology, University of Ioannina, 45110 Ioannina, Greece
| | - Konstantinos Spyrou
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Mohammed Subrati
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Angeliki C Polydera
- Laboratory of Biotechnology, Department of Biological Applications and Technology, University of Ioannina, 45110 Ioannina, Greece
| | | | - Haralambos Stamatis
- Laboratory of Biotechnology, Department of Biological Applications and Technology, University of Ioannina, 45110 Ioannina, Greece
| | - Dimitrios Gournis
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
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Chalmpes N, Kouloumpis A, Zygouri P, Karouta N, Spyrou K, Stathi P, Tsoufis T, Georgakilas V, Gournis D, Rudolf P. Layer-by-Layer Assembly of Clay-Carbon Nanotube Hybrid Superstructures. ACS OMEGA 2019; 4:18100-18107. [PMID: 31720512 PMCID: PMC6843709 DOI: 10.1021/acsomega.9b01970] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Accepted: 09/27/2019] [Indexed: 05/27/2023]
Abstract
Much of the research effort concerning layered materials is directed toward their use as building blocks for the development of hybrid nanostructures with well-defined dimensions and behavior. Here, we report the fabrication through layer-by-layer deposition and intercalation chemistry of a new type of clay-based hybrid film, where functionalized carbon nanotubes are sandwiched between nanometer-sized smectite clay platelets. Single-walled carbon nanotubes (SWCNTs) were covalently functionalized in a single step with phenol groups, via 1,3-dipolar cycloaddition, to allow for stable dispersion in polar solvents. For the production of hybrid thin films, a bottom-up approach combining self-assembly with Langmuir-Schaefer deposition was applied. Smectite clay nanoplatelets act as a structure-directing interface and reaction media for grafting functionalized carbon nanotubes in a bidimensional array, allowing for a controllable layer-by-layer growth at a nanoscale. Hybrid clay/SWCNT multilayer films deposited on various substrates were characterized by X-ray reflectivity, Raman, and X-ray photoelectron spectroscopies, as well as atomic force microscopy.
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Affiliation(s)
- Nikolaos Chalmpes
- Department
of Materials Science and Engineering, University
of Ioannina, GR-45110 Ioannina, Greece
| | - Antonios Kouloumpis
- Department
of Materials Science and Engineering, University
of Ioannina, GR-45110 Ioannina, Greece
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands
| | - Panagiota Zygouri
- Department
of Materials Science and Engineering, University
of Ioannina, GR-45110 Ioannina, Greece
| | - Niki Karouta
- Department
of Materials Science and Engineering, University
of Ioannina, GR-45110 Ioannina, Greece
| | - Konstantinos Spyrou
- Department
of Materials Science and Engineering, University
of Ioannina, GR-45110 Ioannina, Greece
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands
| | - Panagiota Stathi
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands
| | - Theodoros Tsoufis
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands
| | | | - Dimitrios Gournis
- Department
of Materials Science and Engineering, University
of Ioannina, GR-45110 Ioannina, Greece
| | - Petra Rudolf
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands
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Vajglová Z, Kumar N, Peurla M, Peltonen J, Heinmaa I, Murzin DY. Synthesis and physicochemical characterization of beta zeolite–bentonite composite materials for shaped catalysts. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01951g] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Composite materials for shaped catalysts were prepared from three commercial beta zeolites using bentonite as an aluminosilicate clay binder.
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Affiliation(s)
- Zuzana Vajglová
- Åbo Akademi University
- Johan Gadolin Process Chemistry Centre
- Laboratory of Industrial Chemistry and Reaction Engineering
- Turku/Åbo
- Finland
| | - Narendra Kumar
- Åbo Akademi University
- Johan Gadolin Process Chemistry Centre
- Laboratory of Industrial Chemistry and Reaction Engineering
- Turku/Åbo
- Finland
| | | | | | - Ivo Heinmaa
- National Institute of Chemical Physics and Biophysics
- 12618 Tallinn
- Estonia
| | - Dmitry Yu. Murzin
- Åbo Akademi University
- Johan Gadolin Process Chemistry Centre
- Laboratory of Industrial Chemistry and Reaction Engineering
- Turku/Åbo
- Finland
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Zhu Q, Zhang Z, Sadakane M, Yoshida A, Hara M, Ueda W. Synthesis of crystalline molybdenum oxides based on a 1D molecular structure and their ion-exchange properties. NEW J CHEM 2017. [DOI: 10.1039/c7nj00334j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crystalline molybdotellurate based on a 1D molecular structure exhibits interesting ion-exchange properties with both inorganic and organic cations.
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Affiliation(s)
- Qianqian Zhu
- Faculty of Engineering
- Kanagawa University
- Rokkakubashi, Kanagawa-ku
- Yokohama-shi
- Japan
| | - Zhenxin Zhang
- Faculty of Engineering
- Kanagawa University
- Rokkakubashi, Kanagawa-ku
- Yokohama-shi
- Japan
| | - Masahiro Sadakane
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi Hiroshima 739-8527
- Japan
| | - Akihiro Yoshida
- Faculty of Engineering
- Kanagawa University
- Rokkakubashi, Kanagawa-ku
- Yokohama-shi
- Japan
| | - Michikazu Hara
- Materials and Structures Laboratory
- Tokyo Institute of Technology
- Yokohama-city
- Japan
| | - Wataru Ueda
- Faculty of Engineering
- Kanagawa University
- Rokkakubashi, Kanagawa-ku
- Yokohama-shi
- Japan
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Laipan M, Zhu R, Chen Q, Zhu J, Xi Y, Ayoko GA, He H. From spent Mg/Al layered double hydroxide to porous carbon materials. JOURNAL OF HAZARDOUS MATERIALS 2015; 300:572-580. [PMID: 26257095 DOI: 10.1016/j.jhazmat.2015.07.057] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 06/18/2015] [Accepted: 07/21/2015] [Indexed: 06/04/2023]
Abstract
Adsorption has been considered as an efficient method for the treatment of dye effluents, but proper disposal of the spent adsorbents is still a challenge. This work attempts to provide a facile method to reutilize the spent Mg/Al layered double hydroxide (Mg/Al-LDH) after the adsorption of orange II (OII). Herein, the spent hybrid was carbonized under the protection of nitrogen, and then washed with acid to obtain porous carbon materials. Thermogravimetric analysis results suggested that the carbonization could be well achieved above 600°C, as mass loss of the spent hybrid gradually stabilized. Therefore, the carbonization process was carried out at 600, 800, and 1000°C, respectively. Scanning electron microscope showed that the obtained carbon materials possessed a crooked flaky morphology. Nitrogen adsorption-desorption results showed that the carbon materials had large BET surface area and pore volume, e.g., 1426 m(2)/g and 1.67 cm(3)/g for the sample carbonized at 800°C. Moreover, the pore structure and surface chemistry compositions were tunable, as they were sensitive to the temperature. Toluene adsorption results demonstrated that the carbon materials had high efficiency in toluene removal. This work provided a facile approach for synthesizing porous carbon materials using spent Mg/Al-LDH.
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Affiliation(s)
- Minwang Laipan
- Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Runliang Zhu
- Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou 510640, China.
| | - Qingze Chen
- Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianxi Zhu
- Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou 510640, China
| | - Yunfei Xi
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - Godwin A Ayoko
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - Hongping He
- Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangdong Provincial Key Laboratory of Mineral Physics and Material Research & Development, Guangzhou 510640, China
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Kianfar AH, Kamil Mahmood WA, Dinari M, Farrokhpour H, Enteshari M, Azarian MH. Immobilization of cobalt(III) Schiff base complexes onto Montmorillonite-K10: Synthesis, experimental and theoretical structural determination. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt C:1582-1592. [PMID: 25459719 DOI: 10.1016/j.saa.2014.10.051] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Revised: 09/28/2014] [Accepted: 10/15/2014] [Indexed: 06/04/2023]
Abstract
The [Co(naphophen)(PPh3)(OH2)]ClO4 and [Co(naphophen)(PBu3)(OH2)]BF4 (where naphophen=bis(naphthaldehyde)1,2-phenylenediimine) complexes were synthesized and chracterized by FT-IR, UV-Vis, (1)H NMR, (13)C NMR spectroscopy and elemental analysis techniques. The coordination geometry of the synthesized complexes were determined by X-ray crystallography. Cobalt (III) complexes have six-coordinated pseudo-octahedral geometry in which the O(1), O(2), N(1) and N(2) atoms of the Schiff base forms the equatorial plane. These complexes showed a dimeric structure via hydrogen bonding between the phenolate oxygen and the hydrogens of the coordinated H2O molecule. The theoretical calculations were also performed to optimize the structure of the complexes in the gas phase to confirm the structures proposed by X-ray crystallography. In addition, UV-Visible and IR spectra of complexes were calculated and compared with the corresponding experimental spectra to complete the experimental structural identification. The synthesized complexes were incorporated onto the Montmorillonite-K10 nanoclay via simple ion-exchange reaction. The structure and morphology of the obtained nanohybrids were identified by FT-IR, XRD, TGA/DTA, SEM and TEM techniques. Based on the XRD results of the new nanohybrid materials, the Schiff base complexes were intercalated in the interlayer spaces of clay. SEM and TEM micrographs of the clay/complex shows that the resulting hybrid nanomaterials has layer structures.
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Affiliation(s)
- Ali Hossein Kianfar
- Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
| | | | - Mohammad Dinari
- Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Hossein Farrokhpour
- Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Majid Enteshari
- Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
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Dong H, Li Y, Sheng G, Hu L. The study on effective immobilization of lipase on functionalized bentonites and their properties. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcatb.2013.05.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Iman M, Bania KK, Maji TK. Green Jute-Based Cross-Linked Soy Flour Nanocomposites Reinforced with Cellulose Whiskers and Nanoclay. Ind Eng Chem Res 2013. [DOI: 10.1021/ie400609t] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Murshid Iman
- Department of Chemical Sciences, Tezpur University, Assam -784028, India
| | - Kusum K. Bania
- Department of Chemical Sciences, Tezpur University, Assam -784028, India
| | - Tarun K. Maji
- Department of Chemical Sciences, Tezpur University, Assam -784028, India
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Tsoufis T, Georgakilas V, Ke X, Van Tendeloo G, Rudolf P, Gournis D. Incorporation of Pure Fullerene into Organoclays: Towards C60-Pillared Clay Structures. Chemistry 2013; 19:7937-43. [DOI: 10.1002/chem.201300164] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Indexed: 11/11/2022]
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Dimos K, Panagiotopoulos I, Tsoufis T, Gengler RYN, Moukarika A, Rudolf P, Karakassides MA, Bakas T, Gournis D. Effect of [Fe(CN)6]4- substitutions on the spin-flop transition of a layered nickel phyllosilicate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:10289-10295. [PMID: 22694204 DOI: 10.1021/la3016673] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A 3 to 1 Ni/Si antiferromagnetic layered phyllosilicate, Ni(3)Si(C(3)H(6)NH(3))F(0.65)O(1.9)(OH)(4.45)(CH(3)COO)(1.1)·xH(2)O, was modified with K(4)[Fe(CN)(6)]·3H(2)O. This compound retained its ordering as proved by X-ray diffraction, while infrared spectra revealed the presence of [Fe(CN)(6)](4-) groups and X-ray photoelectron spectroscopy showed that the latter partially substitute the acetate groups. Both the parent and the modified compound are canted antiferromagnets with an anisotropy perpendicular to the layers and show spin-flop transitions. For the parent compound, a single step spin-flop occurs at H = 24 kOe. The modified compound shows increased antiferromagnetic canting and a two-step transition (H(1) = 24 kOe, H(2) = 48 kOe). These results testify to the existence of competing interactions that depend sensitively on the grafted species.
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Affiliation(s)
- Konstantinos Dimos
- Department of Materials Science & Engineering, University of Ioannina, Ioannina, Greece.
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NMR and Electrochemical Investigation of the Transport Properties of Methanol and Water in Nafion and Clay-Nanocomposites Membranes for DMFCs. MEMBRANES 2012; 2:325-45. [PMID: 24958179 PMCID: PMC4021886 DOI: 10.3390/membranes2020325] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 06/08/2012] [Accepted: 06/12/2012] [Indexed: 11/17/2022]
Abstract
Water and methanol transport behavior, solvents adsorption and electrochemical properties of filler-free Nafion and nanocomposites based on two smectite clays, were investigated using impedance spectroscopy, DMFC tests and NMR methods, including spin-lattice relaxation and pulsed-gradient spin-echo (PGSE) diffusion under variable temperature conditions. Synthetic (Laponite) and natural (Swy-2) smectite clays, with different structural and physical parameters, were incorporated into the Nafion for the creation of exfoliated nanocomposites. Transport mechanism of water and methanol appears to be influenced from the dimensions of the dispersed platelike silicate layers as well as from their cation exchange capacity (CEC). The details of the NMR results and the effect of the methanol solution concentration are discussed. Clays particles, and in particular Swy-2, demonstrate to be a potential physical barrier for methanol cross-over, reducing the methanol diffusion with an evident blocking effect yet nevertheless ensuring a high water mobility up to 130 °C and for several hours, proving the exceptional water retention property of these materials and their possible use in the DMFCs applications. Electrochemical behavior is investigated by cell resistance and polarization measurements. From these analyses it is derived that the addition of clay materials to recast Nafion decreases the ohmic losses at high temperatures extending in this way the operating range of a direct methanol fuel cell.
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Controlled Synthesis of Carbon-Encapsulated Copper Nanostructures by Using Smectite Clays as Nanotemplates. Chemistry 2012; 18:9305-11. [DOI: 10.1002/chem.201103899] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 03/26/2012] [Indexed: 11/07/2022]
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Gengler RYN, Gournis D, Aimon AH, Toma LM, Rudolf P. The Molecularly Controlled Synthesis of Ordered Bi-dimensional C60Arrays. Chemistry 2012; 18:7594-600. [DOI: 10.1002/chem.201103528] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 02/10/2012] [Indexed: 11/08/2022]
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Zeng X, Cai D, Lin Z, Cai X, Zhang X, Tan S, Xu Y. Morphology and thermal and mechanical properties of phosphonium vermiculite filled poly(ethylene terephthalate) composites. J Appl Polym Sci 2012. [DOI: 10.1002/app.36553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Surface Treated Montmorillonite: Structural and Thermal Properties of Chiral Poly(Amide-Imide)/Organoclay Bionanocomposites Containing Natural Amino Acids. J Inorg Organomet Polym Mater 2012. [DOI: 10.1007/s10904-012-9673-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Nicotera I, Enotiadis A, Angjeli K, Coppola L, Ranieri GA, Gournis D. Effective improvement of water-retention in nanocomposite membranes using novel organo-modified clays as fillers for high temperature PEMFCs. J Phys Chem B 2011; 115:9087-97. [PMID: 21671588 DOI: 10.1021/jp202954g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Toward an enhanced water-retention of polymer electrolyte membranes at high temperatures, novel organo-modified clays were prepared and tested as fillers for the creation of hybrid Nafion nanocomposites. Two smectite clays (Laponite and montmorillonite), with different structural and physical parameters, were loaded with various cationic organic molecules bearing several hydrophilic functional groups (-NH(2), -OH, -SO(3)H) and incorporated in Nafion by solution intercalation. The resulted hybrid membranes were characterized by a combination of powder X-ray diffraction, FTIR spectroscopy, and thermal analysis (DTA/TGA) showing that highly homogeneous exfoliated nanocomposites were created where the individual organoclay layers are uniformly dispersed in the continuous polymeric matrix. In this paper, water-transport properties were investigated by NMR spectroscopy, including pulsed-field-gradient spin-echo diffusion and spectral measurements conducted under variable temperature. Organo-montmorillonite nanofillers demonstrate a considerable effect on the Nafion polymer in terms both of water absorption/retention and water mobility with a remarkable behavior in the region of high temperatures (100-130 °C), denoting that the surface modifications of this clay with acid organic molecules significantly improve the performance of the final composite membrane. (1)H NMR spectral analysis allowed a general description of the water distribution in the system and an estimation of the number of water molecules involved in the hydration shell of the sulfonic groups as well as that absorbed on the organoclay particles.
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Affiliation(s)
- Isabella Nicotera
- Department of Chemistry, University of Calabria, 87036 Rende, Cosenza, Italy.
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Delgado JL, Martín N, de la Cruz P, Langa F. Pyrazolinofullerenes: a less known type of highly versatile fullerene derivatives. Chem Soc Rev 2011; 40:5232-41. [DOI: 10.1039/c1cs15105c] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Tzialla AA, Pavlidis IV, Felicissimo MP, Rudolf P, Gournis D, Stamatis H. Lipase immobilization on smectite nanoclays: characterization and application to the epoxidation of alpha-pinene. BIORESOURCE TECHNOLOGY 2010; 101:1587-1594. [PMID: 19910187 DOI: 10.1016/j.biortech.2009.10.023] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Revised: 10/09/2009] [Accepted: 10/13/2009] [Indexed: 05/28/2023]
Abstract
The immobilization of lipase B from Candida antarctica on smectite group nanoclays (Laponite, SWy-2 and Kunipia), as well as on their organically modified derivatives, was investigated. A combination of techniques, namely X-ray diffraction, thermal analysis, X-ray photoelectron and FT-IR spectroscopy, was used for characterization of the novel immobilized biocatalyst. Structural and biochemical characterization have revealed that the hydrophobic microenvironment created by the organo-modified clays induces minor changes on the secondary structure of the enzyme, resulting in enhanced catalytic behaviour in hydrophobic media. The immobilized lipase on such modified nanoclays can be effectively applied for the indirect epoxidation of alpha-pinene using hydrogen peroxide as substrate. The amount of alpha-pinene epoxide produced in a single-step biocatalytic process is up to 3-fold higher than that of free enzyme or enzyme immobilized in non-modified clays. Moreover, lipase immobilized in modified clays retains up to 90% of its initial activity, even after 48h of incubation in the presence of oxidant, and up to 60% after four reaction cycles, while other forms of the enzyme retain less than 10%.
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Affiliation(s)
- Aikaterini A Tzialla
- Department of Biological Applications and Technologies, University of Ioannina, GR-45110 Ioannina, Greece
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Yao K, Wei Z, Dong A, Hong L. A Novel Polymer Nanocomposite: Polystyrene-Layered Methylbenzamidephenylsilica. Macromolecules 2009. [DOI: 10.1021/ma902281x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ken Yao
- Department of Chemistry, Shanghai University, Shanghai 200444, P. R. China
| | - Zheng Wei
- Department of Chemistry, Shanghai University, Shanghai 200444, P. R. China
| | - AiMei Dong
- Department of Mechanics, Shanghai University, Shanghai 200444, P. R. China
| | - Ling Hong
- Department of Chemistry, Shanghai University, Shanghai 200444, P. R. China
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Manos MJ, Kanatzidis MG. Highly Efficient and Rapid Cs+ Uptake by the Layered Metal Sulfide K2xMnxSn3−xS6 (KMS-1). J Am Chem Soc 2009; 131:6599-607. [DOI: 10.1021/ja900977p] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Manolis J. Manos
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 6020-3113
| | - Mercouri G. Kanatzidis
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 6020-3113
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Stathi P, Litina K, Gournis D, Giannopoulos TS, Deligiannakis Y. Physicochemical study of novel organoclays as heavy metal ion adsorbents for environmental remediation. J Colloid Interface Sci 2007; 316:298-309. [PMID: 17804008 DOI: 10.1016/j.jcis.2007.07.078] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2007] [Revised: 07/18/2007] [Accepted: 07/31/2007] [Indexed: 10/23/2022]
Abstract
Four organic-modified clays based on a SWy-2 montmorillonite were prepared by embedding ammonium organic derivatives with different chelating functionalities (NH(2), COOH, SH or CS(2)) in the interlayer space of montmorillonite. Organic molecules such as (a) hexamethylenediamine, (b) 2-(dimethylamino)ethenethiol, (c) 5-aminovaleric acid and (d) hexamethylenediamine-dithiocarbamate were used for the clay modification in order to study the effect of the chelating functionality on heavy metal ions binding from aqueous solutions. The organoclays were characterized by powder X-ray diffraction (XRD), infrared (FTIR) and NMR spectroscopies. The experimental data showed that the organic molecules are intercalated into the interlamelar space with the long dimension parallel to the clay sheets. Their sorbing properties were evaluated for the removal of heavy metals, Pb, Cd and Zn, from aqueous solutions as a function of the pH. When compared with the unmodified SWy-2 montmorillonite, the modified clays show significant improvement in terms of sorbing selectivity as well as of metal loading capacity. The fit to adsorption data by a Surface Complexation Model shows that the intercalated molecules act as specific binding sites in the clay. These contribute additional sorption capacity which is additive to the variable charge edge-sites of the clay in competition with the permanent charge sites.
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Affiliation(s)
- Panagiota Stathi
- Department of Environmental and Natural Resources Management, University of Ioannina, Seferi 2, 30100 Agrinio, Greece
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