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Froudas K, Vassaki M, Papadopoulos K, Tsangarakis C, Chen X, Shepard W, Fairen-Jimenez D, Tampaxis C, Charalambopoulou G, Steriotis TA, Trikalitis PN. Expanding the Reticular Chemistry Building Block Library toward Highly Connected Nets: Ultraporous MOFs Based on 18-Connected Ternary, Trigonal Prismatic Superpolyhedra. J Am Chem Soc 2024; 146:8961-8970. [PMID: 38428926 PMCID: PMC10996011 DOI: 10.1021/jacs.3c12679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 02/10/2024] [Accepted: 02/16/2024] [Indexed: 03/03/2024]
Abstract
The chemistry of metal-organic frameworks (MOFs) continues to expand rapidly, providing materials with diverse structures and properties. The reticular chemistry approach, where well-defined structural building blocks are combined together to form crystalline open framework solids, has greatly accelerated the discovery of new and important materials. However, its full potential toward the rational design of MOFs relies on the availability of highly connected building blocks because these greatly reduce the number of possible structures. Toward this, building blocks with connectivity greater than 12 are highly desirable but extremely rare. We report here the discovery of novel 18-connected, trigonal prismatic, ternary building blocks (tbb's) and their assembly into unique MOFs, denoted as Fe-tbb-MOF-x (x: 1, 2, 3), with hierarchical micro- and mesoporosity. The remarkable tbb is an 18-c supertrigonal prism, with three points of extension at each corner, consisting of triangular (3-c) and rectangular (4-c) carboxylate-based organic linkers and trigonal prismatic [Fe3(μ3-Ο)(-COO)6]+ clusters. The tbb's are linked together by an 18-c cluster made of 4-c ligands and a crystallographically distinct Fe3(μ3-Ο) trimer, forming overall a 3-D (3,4,4,6,6)-c five nodal net. The hierarchical, highly porous nature of Fe-tbb-MOF-x (x: 1, 2, 3) was confirmed by recording detailed sorption isotherms of Ar, CH4, and CO2 at 87, 112, and 195 K, respectively, revealing an ultrahigh BET area (4263-4847 m2 g-1) and pore volume (1.95-2.29 cm3 g-1). Because of the observed ultrahigh porosities, the H2 and CH4 storage properties of Fe-tbb-MOF-x were investigated, revealing well-balanced high gravimetric and volumetric deliverable capacities for cryoadsorptive H2 storage (11.6 wt %/41.4 g L-1, 77 K/100 bar-160 K/5 bar), as well as CH4 storage at near ambient temperatures (367 mg g-1/160 cm3 STP cm-3, 5-100 bar at 298 K), placing these materials among the top performing MOFs. The present work opens new directions to apply reticular chemistry for the construction of novel MOFs with tunable porosities based on contracted or expanded tbb analogues.
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Affiliation(s)
| | - Maria Vassaki
- Department
of Chemistry, University of Crete, Heraklion 71003, Greece
| | | | | | - Xu Chen
- Department
of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
| | - William Shepard
- Synchrotron
SOLEIL-UR1, L’Orme des Merisiers, Saint-Aubin, BP 48, Gif-Sur-Yvette 91192, France
| | - David Fairen-Jimenez
- Department
of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
| | - Christos Tampaxis
- National
Center for Scientific Research “Demokritos”, Athens 15341, Greece
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Stanley J, Xanthopoulou E, Finšgar M, Zemljič LF, Klonos PA, Kyritsis A, Koltsakidis S, Tzetzis D, Lambropoulou DA, Baciu D, Steriotis TA, Charalambopoulou G, Bikiaris DN. Synthesis of Poly(ethylene furanoate) Based Nanocomposites by In Situ Polymerization with Enhanced Antibacterial Properties for Food Packaging Applications. Polymers (Basel) 2023; 15:4502. [PMID: 38231946 PMCID: PMC10708257 DOI: 10.3390/polym15234502] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 10/29/2023] [Accepted: 11/20/2023] [Indexed: 01/19/2024] Open
Abstract
Poly(ethylene 2,5-furandicarboxylate) (PEF)-based nanocomposites containing Ce-bioglass, ZnO, and ZrO2 nanoparticles were synthesized via in situ polymerization, targeting food packaging applications. The nanocomposites were thoroughly characterized, combining a range of techniques. The successful polymerization was confirmed using attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy, and the molecular weight values were determined indirectly by applying intrinsic viscosity measurements. The nanocomposites' structure was investigated by depth profiling using time-of-flight secondary ion mass spectrometry (ToF-SIMS), while color measurements showed a low-to-moderate increase in the color concentration of all the nanocomposites compared to neat PEF. The thermal properties and crystallinity behavior of the synthesized materials were also examined. The neat PEF and PEF-based nanocomposites show a crystalline fraction of 0-5%, and annealed samples of both PEF and PEF-based nanocomposites exhibit a crystallinity above 20%. Furthermore, scanning electron microscopy (SEM) micrographs revealed that active agent nanoparticles are well dispersed in the PEF matrix. Contact angle measurements showed that incorporating nanoparticles into the PEF matrix significantly reduces the wetting angle due to increased roughness and introduction of the polar -OH groups. Antimicrobial studies indicated a significant increase in inhibition of bacterial strains of about 9-22% for Gram-positive bacterial strains and 5-16% for Gram-negative bacterial strains in PEF nanocomposite films, respectively. Finally, nanoindentation tests showed that the ZnO-based nanocomposite exhibits improved hardness and elastic modulus values compared to neat PEF.
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Affiliation(s)
- Johan Stanley
- Laboratory of Chemistry and Technology of Polymers and Colors, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (J.S.); (E.X.)
| | - Eleftheria Xanthopoulou
- Laboratory of Chemistry and Technology of Polymers and Colors, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (J.S.); (E.X.)
| | - Matjaž Finšgar
- Faculty of Chemistry and Chemical Engineering, University of Maribor, SI-2000 Maribor, Slovenia;
| | - Lidija Fras Zemljič
- Faculty of Mechanical Engineering, University of Maribor, SI-2000 Maribor, Slovenia;
| | - Panagiotis A. Klonos
- Department of Physics, National Technical University of Athens, Zografou Campus, GR-15780 Athens, Greece; (P.A.K.); (A.K.)
| | - Apostolos Kyritsis
- Department of Physics, National Technical University of Athens, Zografou Campus, GR-15780 Athens, Greece; (P.A.K.); (A.K.)
| | - Savvas Koltsakidis
- Digital Manufacturing and Materials Characterization Laboratory, International Hellenic University, GR-57001 Thessaloniki, Greece; (S.K.); (D.T.)
| | - Dimitrios Tzetzis
- Digital Manufacturing and Materials Characterization Laboratory, International Hellenic University, GR-57001 Thessaloniki, Greece; (S.K.); (D.T.)
| | - Dimitra A. Lambropoulou
- Laboratory of Environmental Pollution Control, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece;
- Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, GR-57001 Thessaloniki, Greece
| | - Diana Baciu
- National Center for Scientific Research “Demokritos”, GR-15341 Ag. Paraskevi Attikis, Greece; (D.B.); (T.A.S.); (G.C.)
| | - Theodore A. Steriotis
- National Center for Scientific Research “Demokritos”, GR-15341 Ag. Paraskevi Attikis, Greece; (D.B.); (T.A.S.); (G.C.)
| | - Georgia Charalambopoulou
- National Center for Scientific Research “Demokritos”, GR-15341 Ag. Paraskevi Attikis, Greece; (D.B.); (T.A.S.); (G.C.)
| | - Dimitrios N. Bikiaris
- Laboratory of Chemistry and Technology of Polymers and Colors, Department of Chemistry, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece; (J.S.); (E.X.)
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3
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Bratsos I, Tampaxis C, Spanopoulos I, Demitri N, Charalambopoulou G, Vourloumis D, Steriotis TA, Trikalitis PN. Heterometallic In(III)–Pd(II) Porous Metal–Organic Framework with Square-Octahedron Topology Displaying High CO2 Uptake and Selectivity toward CH4 and N2. Inorg Chem 2018; 57:7244-7251. [DOI: 10.1021/acs.inorgchem.8b00910] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ioannis Bratsos
- National Center for Scientific Research “Demokritos”, Patriarchou Gregoriou E’ & Neapoleos 27, Athens 15310, Greece
| | - Christos Tampaxis
- National Center for Scientific Research “Demokritos”, Patriarchou Gregoriou E’ & Neapoleos 27, Athens 15310, Greece
- Department of Chemistry, University of Crete, Voutes, 71003 Heraklion, Greece
| | - Ioannis Spanopoulos
- Department of Chemistry, University of Crete, Voutes, 71003 Heraklion, Greece
| | - Nicola Demitri
- Elettra − Sincrotrone Trieste, S. S. 14 Km 163.5 in Area Science Park, 34149 Basovizza, Trieste Italy
| | - Georgia Charalambopoulou
- National Center for Scientific Research “Demokritos”, Patriarchou Gregoriou E’ & Neapoleos 27, Athens 15310, Greece
| | - Dionisios Vourloumis
- National Center for Scientific Research “Demokritos”, Patriarchou Gregoriou E’ & Neapoleos 27, Athens 15310, Greece
| | - Theodore A. Steriotis
- National Center for Scientific Research “Demokritos”, Patriarchou Gregoriou E’ & Neapoleos 27, Athens 15310, Greece
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4
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Zygouri P, Tsoufis T, Kouloumpis A, Patila M, Potsi G, Sevastos AA, Sideratou Z, Katsaros F, Charalambopoulou G, Stamatis H, Rudolf P, Steriotis TA, Gournis D. Synthesis, characterization and assessment of hydrophilic oxidized carbon nanodiscs in bio-related applications. RSC Adv 2018. [DOI: 10.1039/c7ra11045f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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] Open
Abstract
Hydrophilic oxidized carbon nanodiscs able to be used as drug delivery system and as support in nanobiocatalytic applications.
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5
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Huen P, Peru F, Charalambopoulou G, Steriotis TA, Jensen TR, Ravnsbæk DB. Nanoconfined NaAlH 4 Conversion Electrodes for Li Batteries. ACS Omega 2017; 2:1956-1967. [PMID: 31457554 PMCID: PMC6641067 DOI: 10.1021/acsomega.7b00143] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 04/26/2017] [Indexed: 05/05/2023]
Abstract
In the past, sodium alanate, NaAlH4, has been widely investigated for its capability to store hydrogen, and its potential for improving storage properties through nanoconfinement in carbon scaffolds has been extensively studied. NaAlH4 has recently been considered for Li-ion storage as a conversion-type anode in Li-ion batteries. Here, NaAlH4 nanoconfined in carbon scaffolds as an anode material for Li-ion batteries is reported for the first time. Nanoconfined NaAlH4 was prepared by melt infiltration into mesoporous carbon scaffolds. In the first cycle, the electrochemical reversibility of nanoconfined NaAlH4 was improved from around 30 to 70% compared to that of nonconfined NaAlH4. Cyclic voltammetry revealed that nanoconfinement alters the conversion pathway, and operando powder X-ray diffraction showed that the conversion from NaAlH4 into Na3AlH6 is favored over the formation of LiNa2AlH6. The electrochemical reactivity of the carbon scaffolds has also been investigated to study their contribution to the overall capacity of the electrodes.
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Affiliation(s)
- Priscilla Huen
- Center
for Materials Crystallography, Interdisciplinary Nanoscience Center
and Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark
| | - Filippo Peru
- National
Center for Scientific Research “Demokritos”, 15310 Agia Paraskevi Attikis, Greece
| | | | - Theodore A. Steriotis
- National
Center for Scientific Research “Demokritos”, 15310 Agia Paraskevi Attikis, Greece
| | - Torben R. Jensen
- Center
for Materials Crystallography, Interdisciplinary Nanoscience Center
and Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark
| | - Dorthe B. Ravnsbæk
- Department
of Physics, Chemistry and Pharmacy, University
of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
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6
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Kourtellaris A, Moushi EE, Spanopoulos I, Tampaxis C, Charalambopoulou G, Steriotis TA, Papaefstathiou GS, Trikalitis PN, Tasiopoulos AJ. A microporous Cu2+MOF based on a pyridyl isophthalic acid Schiff base ligand with high CO2uptake. Inorg Chem Front 2016. [DOI: 10.1039/c6qi00273k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new microporous Cu2+MOF is reported containing a pyridyl-isophthalic acid Schiff base ligand which exhibits a significant BET area and high CO2sorptbion capacity.
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Affiliation(s)
| | - Eleni E. Moushi
- Department of Chemistry
- University of Cyprus
- 1678 Nicosia
- Cyprus
| | | | - Christos Tampaxis
- Department of Chemistry
- University of Crete
- Heraklion
- Greece
- National Center for Scientific Research Demokritos
| | | | | | - Giannis S. Papaefstathiou
- Laboratory of Inorganic Chemistry
- Department of Chemistry
- National and Kapodistrian University of Athens
- Greece
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7
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Karavasili C, Amanatiadou EP, Sygellou L, Giasafaki DK, Steriotis TA, Charalambopoulou GC, Vizirianakis IS, Fatouros DG. Development of new drug delivery system based on ordered mesoporous carbons: characterisation and cytocompatibility studies. J Mater Chem B 2013; 1:3167-3174. [PMID: 32260917 DOI: 10.1039/c3tb20304b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ordered mesoporous carbons that encapsulate the poorly soluble compounds ibuprofen and indomethacin were systematically studied by means of X-ray diffraction (XRD), differential scanning calorimetry (DSC) and X-ray photon electron spectroscopy (XPS). The results showed marked differences in the release profiles of the two drug molecules in simulated gastric fluids. In vitro toxicity profiles appear to be compatible with potential therapeutic applications bringing them to the forefront as carriers of poorly water soluble drugs.
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Affiliation(s)
- Christina Karavasili
- Laboratory of Pharmaceutical Technology, Department of Pharmaceutical Sciences, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece.
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8
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Bakandritsos A, Papagiannopoulos A, Anagnostou EN, Avgoustakis K, Zboril R, Pispas S, Tucek J, Ryukhtin V, Bouropoulos N, Kolokithas-Ntoukas A, Steriotis TA, Keiderling U, Winnefeld F. Merging high doxorubicin loading with pronounced magnetic response and bio-repellent properties in hybrid drug nanocarriers. Small 2012; 8:2381-2393. [PMID: 22549909 DOI: 10.1002/smll.201102525] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 02/15/2012] [Indexed: 05/31/2023]
Abstract
Hybrid magnetic drug nanocarriers are prepared via a self-assembly process of poly(methacrylic acid)-graft-poly(ethyleneglycol methacrylate) (p(MAA-g-EGMA)) on growing iron oxide nanocrystallites. The nanocarriers successfully merge together bio-repellent properties, pronounced magnetic response, and high loading capacity for the potent anticancer drug doxorubicin (adriamicin), in a manner not observed before in such hybrid colloids. High magnetic responses are accomplished by engineering the size of the magnetic nanocrystallites (∼13.5 nm) following an aqueous single-ferrous precursor route, and through adjustment of the number of cores in each colloidal assembly. Complementing conventional magnetometry, the magnetic response of the nanocarriers is evaluated by magnetophoretic experiments providing insight into their internal organization and on their response to magnetic manipulation. The structural organization of the graft-copolymer, locked on the surface of the nanocrystallites, is further probed by small-angle neutron scattering on single-core colloids. Analysis showed that the MAA segments selectively populate the area around the magnetic nanocrystallites, while the poly(ethylene glycol)-grafted chains are arranged as protrusions, pointing towards the aqueous environment. These nanocarriers are screened at various pHs and in highly salted media by light scattering and electrokinetic measurements. According to the results, their stability is dramatically enhanced, as compared to uncoated nanocrystallites, owing to the presence of the external protective PEG canopy. The nanocarriers are also endowed with bio-repellent properties, as evidenced by stability assays using human blood plasma as the medium.
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9
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Psofogiannakis GM, Steriotis TA, Bourlinos AB, Kouvelos EP, Charalambopoulou GC, Stubos AK, Froudakis GE. Enhanced hydrogen storage by spillover on metal-doped carbon foam: an experimental and computational study. Nanoscale 2011; 3:933-936. [PMID: 21218229 DOI: 10.1039/c0nr00767f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A lightweight, oxygen-rich carbon foam was prepared and doped with Pd/Hg alloy nanoparticles. The composite revealed high H2 sorption capacity (5 wt%) at room temperature and moderate pressure (2 MPa). The results were explained on the basis of the H2 spillover mechanism using Density Functional Theory.
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Affiliation(s)
- George M Psofogiannakis
- Department of Chemistry, University of Crete, PO Box 2208, Voutes, Heraklion Crete, 710 03, Greece
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10
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Zbořil R, Karlický F, Bourlinos AB, Steriotis TA, Stubos AK, Georgakilas V, Šafářová K, Jančík D, Trapalis C, Otyepka M. Graphene fluoride: a stable stoichiometric graphene derivative and its chemical conversion to graphene. Small 2010; 6:2885-91. [PMID: 21104801 PMCID: PMC3020323 DOI: 10.1002/smll.201001401] [Citation(s) in RCA: 189] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 10/04/2010] [Indexed: 05/18/2023]
Abstract
Stoichoimetric graphene fluoride monolayers are obtained in a single step by the liquid-phase exfoliation of graphite fluoride with sulfolane. Comparative quantum-mechanical calculations reveal that graphene fluoride is the most thermodynamically stable of five studied hypothetical graphene derivatives; graphane, graphene fluoride, bromide, chloride, and iodide. The graphene fluoride is transformed into graphene via graphene iodide, a spontaneously decomposing intermediate. The calculated bandgaps of graphene halides vary from zero for graphene bromide to 3.1 eV for graphene fluoride. It is possible to design the electronic properties of such two-dimensional crystals.
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Affiliation(s)
- Radek Zbořil
- Regional Center of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, tr. 17. listopadu 12, Olomouc 77146Czech Republic E-mail:
| | - František Karlický
- Regional Center of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, tr. 17. listopadu 12, Olomouc 77146Czech Republic E-mail:
| | - Athanasios B Bourlinos
- Institute of Materials Science, NCSR “Demokritos”, Ag. Paraskevi AttikisAthens 15310, Greece E-mail:
| | - Theodore A Steriotis
- Institute of Physical Chemistry, NCSR “Demokritos”, Ag. Paraskevi AttikisAthens 15310, Greece
| | - Athanasios K Stubos
- Institute of Nuclear Technology and Radiation Protection, Environmental Research Laboratory, NCSR “Demokritos” Ag. Paraskevi AttikisAthens 15310, Greece
| | - Vasilios Georgakilas
- Institute of Materials Science, NCSR “Demokritos”, Ag. Paraskevi AttikisAthens 15310, Greece E-mail:
| | - Klára Šafářová
- Regional Center of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, tr. 17. listopadu 12, Olomouc 77146Czech Republic E-mail:
| | - Dalibor Jančík
- Institute of Materials Science, NCSR “Demokritos”, Ag. Paraskevi AttikisAthens 15310, Greece E-mail:
| | - Christos Trapalis
- Institute of Materials Science, NCSR “Demokritos”, Ag. Paraskevi AttikisAthens 15310, Greece E-mail:
| | - Michal Otyepka
- Regional Center of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, tr. 17. listopadu 12, Olomouc 77146Czech Republic E-mail:
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Abstract
Graphene sheets derived from dispersion of graphite in pyridine were functionalised by the 1,3 dipolar cycloaddition of azomethine ylide. The organically modified graphene sheets are easily dispersible in polar organic solvents and water, and they are extensively characterised using several spectroscopic and microscopy techniques.
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Affiliation(s)
- Vasilios Georgakilas
- Institute of Material Science, N.C.S.R Demokritos, 15310 Ag. Paraskevi, Attikis, Greece.
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12
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Affiliation(s)
- Athanasios B Bourlinos
- Institute of Materials Science, NCSR "Demokritos" Ag. Paraskevi Attikis, Athens 15310, Greece.
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Kikkinides ES, Konstantakou M, Georgiadis MC, Steriotis TA, Stubos AK. Multiscale modeling and optimization of H2 storage using nanoporous adsorbents. AIChE J 2006. [DOI: 10.1002/aic.10910] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Kainourgiakis ME, Kikkinides ES, Steriotis TA, Stubos AK, Tzevelekos KP, Kanellopoulos NK. Structural and Transport Properties of Alumina Porous Membranes from Process-Based and Statistical Reconstruction Techniques. J Colloid Interface Sci 2000; 231:158-167. [PMID: 11082260 DOI: 10.1006/jcis.2000.7115] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We study the structural and transport properties of two model porous membranes made by compaction of spherical monosize gamma-alumina particles. A ballistic deposition process of spherical particles has been employed as a process-based representation method for accurately simulating the pore structure of the membranes. Comparison between the computed and experimental permeability values obtained in the Knudsen regime shows very good agreement for both membranes and indicates that sufficient representation of the original pore structure is achieved with the random sphere packs. In a further step, a medium with the same porosity and autocorrelation function as the sphere pack has been stochastically reconstructed. Comparison between the structural properties of the random sphere pack system (process-based model) and the stochastically reconstructed medium (statistical model) shows nearly identical correlation functions and pore chord length distributions but widely different mass chord length distributions. This is reflected to a significant difference in the prediction of a dynamic property like the Knudsen permeability by a factor of about 4. The results suggest that matching of the porosity and the two-point correlation function alone is not always adequate when pursuing an accurate representation of the structure of a porous material. In such cases, higher order statistical properties of the material contained in the chord length distribution of both pore and solid phase should be satisfied as well. It is also found that proper account of the formation process in the reconstruction of a porous material (process-based model) leads to representations of its structure more accurate than those of statistical reconstruction models. Copyright 2000 Academic Press.
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Affiliation(s)
- ME Kainourgiakis
- National Center for Scientific Research "Demokritos", Ag. Paraskevi Attikis, Athens, 15310, Greece
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15
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Charalambopoulou GC, Steriotis TA, Mitropoulos AC, Stefanopoulos KL, Kanellopoulos NK, Ioffe A. Investigation of water sorption on porcine stratum corneum by very small angle neutron scattering. J Invest Dermatol 1998; 110:988-90. [PMID: 9620313 DOI: 10.1046/j.1523-1747.1998.00215.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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