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Villajos JA, Balderas-Xicohténcatl R, Al Shakhs AN, Berenguer-Murcia Á, Buckley CE, Cazorla-Amorós D, Charalambopoulou G, Couturas F, Cuevas F, Fairen-Jimenez D, Heinselman KN, Humphries TD, Kaskel S, Kim H, Marco-Lozar JP, Oh H, Parilla PA, Paskevicius M, Senkovska I, Shulda S, Silvestre-Albero J, Steriotis T, Tampaxis C, Hirscher M, Maiwald M. Establishing ZIF-8 as a reference material for hydrogen cryoadsorption: An interlaboratory study. Chemphyschem 2024; 25:e202300794. [PMID: 38165137 DOI: 10.1002/cphc.202300794] [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: 10/25/2023] [Revised: 12/28/2023] [Accepted: 01/02/2024] [Indexed: 01/03/2024]
Abstract
Hydrogen storage by cryoadsorption on porous materials has the advantages of low material cost, safety, fast kinetics, and high cyclic stability. The further development of this technology requires reliable data on the H2 uptake of the adsorbents, however, even for activated carbons the values between different laboratories show sometimes large discrepancies. So far no reference material for hydrogen cryoadsorption is available. The metal-organic framework ZIF-8 is an ideal material possessing high thermal, chemical, and mechanical stability that reduces degradation during handling and activation. Here, we distributed ZIF-8 pellets synthesized by extrusion to 9 laboratories equipped with 15 different experimental setups including gravimetric and volumetric analyzers. The gravimetric H2 uptake of the pellets was measured at 77 K and up to 100 bar showing a high reproducibility between the different laboratories, with a small relative standard deviation of 3-4 % between pressures of 10-100 bar. The effect of operating variables like the amount of sample or analysis temperature was evaluated, remarking the calibration of devices and other correction procedures as the most significant deviation sources. Overall, the reproducible hydrogen cryoadsorption measurements indicate the robustness of the ZIF-8 pellets, which we want to propose as a reference material.
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Affiliation(s)
- Jose A Villajos
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
- Centro Ibérico de Investigación en Almacenamiento Energético (CIIAE), Cáceres, Spain
| | - Rafael Balderas-Xicohténcatl
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Current address: Bauhaus Luftfahrt e.V., Münnchen, Germany
| | - Ali N Al Shakhs
- The Adsorption & Advanced Materials Laboratory (A2ML), Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
| | | | | | | | | | - Fabrice Couturas
- Université Paris Est Creteil (CNRS-ICMPE-UMR7182), Thiais, France
| | - Fermin Cuevas
- Université Paris Est Creteil (CNRS-ICMPE-UMR7182), Thiais, France
| | - David Fairen-Jimenez
- The Adsorption & Advanced Materials Laboratory (A2ML), Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
| | | | | | - Stefan Kaskel
- Technische Universität Dresden (TUD), Dresden, Germany
| | - Hyunlim Kim
- Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | | | - Hyunchul Oh
- Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | | | | | | | - Sarah Shulda
- National Renewable Energy Laboratory (NREL), Denver, USA
| | | | - Theodore Steriotis
- National Center for Scientific Research "Demokritos" (NCSRD), Athens, Greece
| | - Christos Tampaxis
- National Center for Scientific Research "Demokritos" (NCSRD), Athens, Greece
| | - Michael Hirscher
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, Japan
| | - Michael Maiwald
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
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Tsangarakis C, Azmy A, Tampaxis C, Zibouche N, Klontzas E, Tylianakis E, Froudakis GE, Steriotis T, Spanopoulos I, Trikalitis PN. Water-Stable etb-MOFs for Methane and Carbon Dioxide Storage. Inorg Chem 2023; 62:5496-5504. [PMID: 36976265 DOI: 10.1021/acs.inorgchem.2c04483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
We utilized the etb platform of MOFs for the synthesis of two new water-stable compounds based on amide functionalized trigonal tritopic organic linkers H3BTBTB (L1), H3BTCTB (L2) and Al3+ metal ions, namely, Al(L1) and Al(L2). The mesoporous Al(L1) material exhibits an impressive methane (CH4) uptake at high pressures and ambient temperature. The corresponding values of 192 cm3 (STP) cm-3, 0.254 g g-1 at 100 bar, and 298 K are among the highest reported for mesoporous MOFs, while the gravimetric and volumetric working capacities (between 80 bar and 5 bar) can be well compared to the best MOFs for CH4 storage. Furthermore, at 298 K and 50 bar, Al(L1) adsorbs 50 wt % (304 cm3 (STP) cm-3) CO2, values among the best recorded for CO2 storage using porous materials. To gain insight into the mechanism accounting for the resultant enhanced CH4 storage capacity, theoretical calculations were performed, revealing the presence of strong CH4 adsorption sites near the amide groups. Our work demonstrates that amide functionalized mesoporous etb-MOFs can be valuable for the design of versatile coordination compounds with CH4 and CO2 storage capacities comparable to ultra-high surface area microporous MOFs.
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Affiliation(s)
| | - Ali Azmy
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Christos Tampaxis
- National Center for Scientific Research "Demokritos", Patriarchou Grigoriou and Neapoleos 27, 15341 Athens, Greece
| | | | - Emmanuel Klontzas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 116 35 Athens, Greece
| | - Emmanuel Tylianakis
- Department of Materials Science and Technology, University of Crete, Heraklion 71003, Greece
| | | | - Theodore Steriotis
- National Center for Scientific Research "Demokritos", Patriarchou Grigoriou and Neapoleos 27, 15341 Athens, Greece
| | - Ioannis Spanopoulos
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
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Krokidas P, Spera MB, Boutsika LG, Bratsos I, Charalambopoulou G, Economou IG, Steriotis T. Nanoengineered ZIF Fillers for Mixed Matrix Membranes with Enhanced CO2/CH4 Selectivity. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Giasafaki D, Mitzithra C, Belessi V, Filippakopoulou T, Koutsioukis A, Georgakilas V, Charalambopoulou G, Steriotis T. Graphene-Based Composites with Silver Nanowires for Electronic Applications. Nanomaterials (Basel) 2022; 12:nano12193443. [PMID: 36234570 PMCID: PMC9565487 DOI: 10.3390/nano12193443] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/22/2022] [Accepted: 09/26/2022] [Indexed: 05/27/2023]
Abstract
Graphene/metal nanocomposites have shown a strong potential for use in electronic applications. In particular, the combination of silver nanowires (AgNWs) with graphene derivatives leads to the formation of an efficient conductive network, thus improving the electrical properties of a composite. This work focused on developing highly conductive hydrophilic hybrids of simultaneously functionalized and reduced graphene oxide (f-rGO) and AgNWs in different weight ratios by following two different synthetic routes: (a) the physical mixture of f-rGO and AgNWs, and (b) the in situ reduction of GO in the presence of AgNWs. In addition, the role of AgNWs in improving the electrical properties of graphene derivatives was further examined by mixing AgNWs with a hybrid of few-layered graphene with functionalized multiwalled carbon nanotubes (FLG/MWNT-f-OH). The studied materials showed a remarkable improvement in the overall electrical conductivity due to the synergistic effect of their components, which was proportional to the percentage of Ag and dependent on the procedure of the hybrid formation. One of the f-rGO/AgNWs composites was also selected for the preparation of gravure printing inks that were tested to determine their rheological and printing properties. All of the f-rGO/AgNWs composites were shown to be very promising materials for use as conductive inks for flexible electronics.
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Affiliation(s)
- Dimitra Giasafaki
- National Centre for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
| | - Christina Mitzithra
- National Centre for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
| | - Vassiliki Belessi
- Department of Graphic Design and Visual Communication, Graphic Arts Technology Study Direction, University of West Attica, 12243 Egaleo, Greece
- Laboratory of Electronic Devices and Materials, Department of Electrical and Electronic Engineering, University of West Attica, 12244 Egaleo, Greece
| | - Theodora Filippakopoulou
- Department of Graphic Design and Visual Communication, Graphic Arts Technology Study Direction, University of West Attica, 12243 Egaleo, Greece
| | | | | | | | - Theodore Steriotis
- National Centre for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Greece
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Mamai M, Giasafaki D, Salvanou EA, Charalambopoulou G, Steriotis T, Bouziotis P. Biodistribution of Mesoporous Carbon Nanoparticles via Technetium-99m Radiolabelling after Oral Administration to Mice. Nanomaterials (Basel) 2021; 11:3260. [PMID: 34947611 PMCID: PMC8703805 DOI: 10.3390/nano11123260] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/25/2021] [Accepted: 11/26/2021] [Indexed: 02/06/2023]
Abstract
The use of ordered mesoporous matrices, and in particular carbon-based mesoporous nanoparticles has shown great potential towards enhancing the bioavailability of orally administered drugs. Nevertheless, elucidation of the in vivo absorption, distribution, and excretion of such carriers is essential for understanding their behaviour, and radiolabelling provides a very useful way to track their occurrence inside the body. In this work, uniform spherical CMK-1-type ordered mesoporous carbon nanoparticles have been radiolabelled with Technetium-99m (99mTc) and traced after oral administration to mice. Ex vivo biodistribution studies showed that the radiolabelled nanoparticles accumulated almost exclusively in the gastrointestinal tract; complete elimination of the radiotracer was observed within 24 h after administration, with practically no uptake into other main organs. These findings along with the results from in vitro stability studies indicate that the spherical carbon nanoparticles examined could be safely used as drug carriers with minimal side effects, but also support the great value of radiolabelling methods for monitoring the particles' behaviour in vivo.
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Affiliation(s)
- Maria Mamai
- Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (M.M.); (E.-A.S.)
- Institute of Nanoscience & Nanotechnology, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (D.G.); (T.S.)
| | - Dimitra Giasafaki
- Institute of Nanoscience & Nanotechnology, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (D.G.); (T.S.)
| | - Evangelia-Alexandra Salvanou
- Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (M.M.); (E.-A.S.)
| | - Georgia Charalambopoulou
- Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (M.M.); (E.-A.S.)
| | - Theodore Steriotis
- Institute of Nanoscience & Nanotechnology, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (D.G.); (T.S.)
| | - Penelope Bouziotis
- Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (M.M.); (E.-A.S.)
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Boffito M, Laurano R, Giasafaki D, Steriotis T, Papadopoulos A, Tonda-Turo C, Cassino C, Charalambopoulou G, Ciardelli G. Embedding Ordered Mesoporous Carbons into Thermosensitive Hydrogels: A Cutting-Edge Strategy to Vehiculate a Cargo and Control Its Release Profile. Nanomaterials (Basel) 2020; 10:nano10112165. [PMID: 33138290 PMCID: PMC7692333 DOI: 10.3390/nano10112165] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 10/21/2020] [Accepted: 10/26/2020] [Indexed: 12/17/2022]
Abstract
The high drug loading capacity, cytocompatibility and easy functionalization of ordered mesoporous carbons (OMCs) make them attractive nanocarriers to treat several pathologies. OMCs’ efficiency could be further increased by embedding them into a hydrogel phase for an in loco prolonged drug release. In this work, OMCs were embedded into injectable thermosensitive hydrogels. In detail, rod-like (diameter ca. 250 nm, length ca. 700 nm) and spherical (diameter approximately 120 nm) OMCs were synthesized by nanocasting selected templates and loaded with ibuprofen through a melt infiltration method to achieve complete filling of their pores (100% loading yield). In parallel, an amphiphilic Poloxamer® 407-based poly(ether urethane) was synthesized (Mn¯ 72 kDa) and solubilized at 15 and 20% w/v concentration in saline solution to design thermosensitive hydrogels. OMC incorporation into the hydrogels (10 mg/mL concentration) did not negatively affect their gelation potential. Hybrid systems successfully released ibuprofen at a slower rate compared to control gels (gels embedding ibuprofen as such), but with no significant differences between rod-like and spherical OMC-loaded gels. OMCs can thus work as effective drug reservoirs that progressively release their payload over time and also upon encapsulation in a hydrogel phase, thus opening the way to their application to treat many different pathological states (e.g., as topical medications).
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Affiliation(s)
- Monica Boffito
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy; (R.L.); (C.T.-T.); (G.C.)
- PolitoBIOMed Lab, Politecnico di Torino, 10129 Turin, Italy
- Correspondence: (M.B.); (G.C.); Tel.: +39-0131-229-347 (M.B.); +30-650-3404 (G.C.)
| | - Rossella Laurano
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy; (R.L.); (C.T.-T.); (G.C.)
- PolitoBIOMed Lab, Politecnico di Torino, 10129 Turin, Italy
| | - Dimitra Giasafaki
- National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (D.G.); (T.S.); (A.P.)
| | - Theodore Steriotis
- National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (D.G.); (T.S.); (A.P.)
| | - Athanasios Papadopoulos
- National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (D.G.); (T.S.); (A.P.)
| | - Chiara Tonda-Turo
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy; (R.L.); (C.T.-T.); (G.C.)
- PolitoBIOMed Lab, Politecnico di Torino, 10129 Turin, Italy
| | - Claudio Cassino
- Department of Science and Technological Innovation, Università del Piemonte Orientale, 15121 Alessandria, Italy;
| | - Georgia Charalambopoulou
- National Centre for Scientific Research “Demokritos”, 15341 Athens, Greece; (D.G.); (T.S.); (A.P.)
- Correspondence: (M.B.); (G.C.); Tel.: +39-0131-229-347 (M.B.); +30-650-3404 (G.C.)
| | - Gianluca Ciardelli
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy; (R.L.); (C.T.-T.); (G.C.)
- PolitoBIOMed Lab, Politecnico di Torino, 10129 Turin, Italy
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Nguyen HGT, Sims CM, Toman B, Horn J, van Zee RD, Thommes M, Ahmad R, Denayer JFM, Baron GV, Napolitano E, Bielewski M, Mangano E, Brandani S, Broom DP, Benham MJ, Dailly A, Dreisbach F, Edubilli S, Gumma S, Möllmer J, Lange M, Tian M, Mays TJ, Shigeoka T, Yamakita S, Hakuman M, Nakada Y, Nakai K, Hwang J, Pini R, Jiang H, Ebner AD, Nicholson MA, Ritter JA, Farrando-Pérez J, Cuadrado-Collados C, Silvestre-Albero J, Tampaxis C, Steriotis T, Řimnáčová D, Švábová M, Vorokhta M, Wang H, Bovens E, Heymans N, De Weireld G. A reference high-pressure CH4 adsorption isotherm for zeolite Y: results of an interlaboratory study. ADSORPTION 2020. [DOI: 10.1007/s10450-020-00253-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractThis paper reports the results of an international interlaboratory study led by the National Institute of Standards and Technology (NIST) on the measurement of high-pressure surface excess methane adsorption isotherms on NIST Reference Material RM 8850 (Zeolite Y), at 25 °C up to 7.5 MPa. Twenty laboratories participated in the study and contributed over one-hundred adsorption isotherms of methane on Zeolite Y. From these data, an empirical reference equation was determined, along with a 95% uncertainty interval (Uk=2). By requiring participants to replicate a high-pressure reference isotherm for carbon dioxide adsorption on NIST Reference Material RM 8852 (ZSM-5), this interlaboratory study also demonstrated the usefulness of reference isotherms in evaluating the performance of high-pressure adsorption experiments.
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Gisbert-Garzarán M, Berkmann JC, Giasafaki D, Lozano D, Spyrou K, Manzano M, Steriotis T, Duda GN, Schmidt-Bleek K, Charalambopoulou G, María Vallet-Regí G. Engineered pH-Responsive Mesoporous Carbon Nanoparticles for Drug Delivery. ACS Appl Mater Interfaces 2020; 12:14946-14957. [PMID: 32141284 PMCID: PMC7116326 DOI: 10.1021/acsami.0c01786] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
In this work, two types of mesoporous carbon particles with different morphology, size, and pore structure have been functionalized with a self-immolative polymer sensitive to changes in pH and tested as drug nanocarriers. It is shown that their textural properties allow significantly higher loading capacity compared to typical mesoporous silica nanoparticles. In vial release experiments of a model Ru dye at pH 7.4 and 5 confirm the pH-responsiveness of the hybrid systems, showing that only small amounts of the cargo are released at physiological pH, whereas at slightly acidic pH (e.g., that of lysosomes), self-immolation takes place and a significant amount of the cargo is released. Cytotoxicity studies using human osteosarcoma cells show that the hybrid nanocarriers are not cytotoxic by themselves but induce significant cell growth inhibition when loaded with a chemotherapeutic drug such as doxorubicin. In preparation of an in vivo application, in vial responsiveness of the hybrid system to short-term pH-triggering is confirmed. The consecutive in vivo study shows no substantial cargo release over a period of 96 h under physiological pH conditions. Short-term exposure to acidic pH releases an experimental fluorescent cargo during and continuously after the triggering period over 72 h.
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Affiliation(s)
- Miguel Gisbert-Garzarán
- Department of Chemistry in Pharmaceutical Sciences, Faculty of Pharmacy, Universidad Complutense de Madrid, Institute de Investigation Sanitaria Hospital 12 de Octubre (imasl2), 28040 Madrid, Spain; Networking Research Center on Bio engineering Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain
| | - Julia C. Berkmann
- Julius Wolff Institute and Center for Musculoskektal Surgery and Berlin-Brandenburg School for Regenerative Therapies, Charit’e–Universitatsmedizin Berlin, 10117 Berlin, Germany
| | - Dimitra Giasafaki
- National Center for Scientific Research “Demokritos”, 15341 Athens, Greece
| | - Daniel Lozano
- Department of Chemistry in Pharmaceutical Sciences, Faculty of Pharmacy, Universidad Complutense de Madrid, Institute de Investigation Sanitaria Hospital 12 de Octubre (imasl2), 28040 Madrid, Spain; Networking Research Center on Bio engineering Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain
| | - Konstantinos Spyrou
- Department of Materials Science and Engineering University of loannina, GR-45110 loannina, Greece
| | - Miguel Manzano
- Department of Chemistry in Pharmaceutical Sciences, Faculty of Pharmacy, Universidad Complutense de Madrid, Instituto de Investigation Sanitaria Hospital 12 de Octubre (imas12), 28040 Madrid, Spain; Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain
| | | | | | - Katharina Schmidt-Bleek
- Julius Wolff Institute and Center for Musculoskektal Surgery and Berlin-Brandenburg School for Regenerative Therapies, Charit’e–Universitatsmedizin Berlin, 10117 Berlin, Germany
| | | | - Georgia María Vallet-Regí
- Department of Chemistry in Pharmaceutical Sciences, Faculty of Pharmacy, Universidad Complutense de Madrid, Institute de Investigation Sanitaria Hospital 12 de Octubre (imasl2), 28040 Madrid, Spain; Networking Research Center on Bio engineering Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain
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Torre E, Giasafaki D, Steriotis T, Cassinelli C, Morra M, Fiorilli S, Vitale-Brovarone C, Charalambopoulou G, Iviglia G. Silver Decorated Mesoporous Carbons for the Treatment of Acute and Chronic Wounds, in a Tissue Regeneration Context. Int J Nanomedicine 2019; 14:10147-10164. [PMID: 32021158 PMCID: PMC6942531 DOI: 10.2147/ijn.s234393] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Accepted: 12/03/2019] [Indexed: 12/15/2022] Open
Abstract
INTRODUCTION Silver decorated mesoporous carbons are interesting systems that may offer effective solutions for advanced wound care products by combining the well-known anti-microbial activity of silver nanoparticles with the versatile properties of ordered mesoporous carbons. Silver is being used as a topical antimicrobial agent, especially in wound repair. However, while silver shows bactericidal properties, it is also cytotoxic at high concentrations. Therefore, the incorporation of silver into ordered mesoporous carbons allows to exploit both silver's biological effects and mesoporous carbons' biocompatibility and versatility with the purpose of conceiving silver-doped materials in light of the growing health concern in wound care. METHODS The wound healing potential of an ordered mesoporous carbon also doped with two different loadings of silver nanoparticles (2 wt% and 10 wt%), was investigated through a biological assessment study based on different assays (cell viability, inflammation, antibacterial tests, macrophage-conditioned fibroblast and human keratinocyte cell cultures). RESULTS The results show silver-doped ordered mesoporous carbons to positively condition cell viability, with a cell viability percentage >70% even for 10 wt% Ag, to modulate the expression of inflammatory cytokines and of genes involved in tissue repair (KRT6a, VEGFA, IVN) and remodeling (MMP9, TIMP3) in different cell systems. Furthermore, along with the biocompatibility and the bioactivity, the silver-doped ordered mesoporous carbons still retain an antibacterial effect, as shown by a maximum of 13.1% of inhibited area in the Halo test. The obtained results clearly showed that the silver-doped ordered mesoporous carbons exhibit both good biocompatibility and antibacterial effect with enhanced re-epithelialization, angiogenesis promotion and tissue regeneration. DISCUSSION These findings suggest that the exceptional properties of silver-doped ordered mesoporous carbons could be exploited in the treatment of acute and chronic wounds and that such carbon materials could be potential candidates for use in medical devices for wound healing purposes, in particular, the 10 wt% loading, as the results showed to be the most effective.
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Affiliation(s)
- Elisa Torre
- Nobil Bio Ricerche Srl, Portacomaro14037, AT, Italy
| | - Dimitra Giasafaki
- National Center for Scientific Research “Demokritos”, Athens15341, Greece
| | - Theodore Steriotis
- National Center for Scientific Research “Demokritos”, Athens15341, Greece
| | | | - Marco Morra
- Nobil Bio Ricerche Srl, Portacomaro14037, AT, Italy
| | - Sonia Fiorilli
- Department of Applied Science and Technology, Politecnico di Torino, Torino, Italy
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Terzopoulou Z, Baciu D, Gounari E, Steriotis T, Charalambopoulou G, Tzetzis D, Bikiaris D. Composite Membranes of Poly(ε-caprolactone) with Bisphosphonate-Loaded Bioactive Glasses for Potential Bone Tissue Engineering Applications. Molecules 2019; 24:E3067. [PMID: 31450742 PMCID: PMC6749304 DOI: 10.3390/molecules24173067] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 08/16/2019] [Accepted: 08/21/2019] [Indexed: 12/11/2022] Open
Abstract
Poly(ε-caprolactone) (PCL) is a bioresorbable synthetic polyester with numerous biomedical applications. PCL membranes show great potential in guided tissue regeneration because they are biocompatible, occlusive and space maintaining, but lack osteoconductivity. Therefore, two different types of mesoporous bioactive glasses (SiO2-CaO-P2O5 and SiO2-SrO-P2O5) were synthesized and incorporated in PCL thin membranes by spin coating. To enhance the osteogenic effect of resulting membranes, the bioglasses were loaded with the bisphosphonate drug ibandronate prior to their incorporation in the polymeric matrix. The effect of the composition of the bioglasses as well as the presence of absorbed ibandronate on the physicochemical, cell attachment and differentiation properties of the PCL membranes was evaluated. Both fillers led to a decrease of the crystallinity of PCL, along with an increase in its hydrophilicity and a noticeable increase in its bioactivity. Bioactivity was further increased in the presence of a Sr substituted bioglass loaded with ibandronate. The membranes exhibited excellent biocompatibility upon estimation of their cytotoxicity on Wharton's Jelly Mesenchymal Stromal Cells (WJ-SCs), while they presented higher osteogenic potential in comparison with neat PCL after WJ-SCs induced differentiation towards bone cells, which was enhanced by a possible synergistic effect of Sr and ibandronate.
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Affiliation(s)
- Zoi Terzopoulou
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Central Macedonia, Greece.
| | - Diana Baciu
- National Center for Scientific Research "Demokritos", GR15341 Athens, Ag. Paraskevi Attikis, Greece
| | - Eleni Gounari
- Biohellenika Biotechnology Company, Leoforos Georgikis Scholis 65, GR57001 Thessaloniki, Central Macedonia, Greece
| | - Theodore Steriotis
- National Center for Scientific Research "Demokritos", GR15341 Athens, Ag. Paraskevi Attikis, Greece
| | - Georgia Charalambopoulou
- National Center for Scientific Research "Demokritos", GR15341 Athens, Ag. Paraskevi Attikis, Greece
| | - Dimitrios Tzetzis
- School of Science and Technology, International Hellenic University, GR57001 Thermi, Central Macedonia, Greece
| | - Dimitrios Bikiaris
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Central Macedonia, Greece
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Sayed E, Karavasili C, Ruparelia K, Haj-Ahmad R, Charalambopoulou G, Steriotis T, Giasafaki D, Cox P, Singh N, Giassafaki LPN, Mpenekou A, Markopoulou CK, Vizirianakis IS, Chang MW, Fatouros DG, Ahmad Z. Electrosprayed mesoporous particles for improved aqueous solubility of a poorly water soluble anticancer agent: in vitro and ex vivo evaluation. J Control Release 2018; 278:142-155. [DOI: 10.1016/j.jconrel.2018.03.031] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 03/22/2018] [Accepted: 03/26/2018] [Indexed: 12/20/2022]
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Terzopoulou Z, Baciu D, Gounari E, Steriotis T, Charalambopoulou G, Bikiaris D. Biocompatible Nanobioglass Reinforced Poly(ε-Caprolactone) Composites Synthesized via In Situ Ring Opening Polymerization. Polymers (Basel) 2018; 10:polym10040381. [PMID: 30966416 PMCID: PMC6415238 DOI: 10.3390/polym10040381] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 03/25/2018] [Accepted: 03/27/2018] [Indexed: 12/22/2022] Open
Abstract
Poly(ε-caprolactone) (PCL) is a bioresorbable synthetic polyester widely studied as a biomaterial for tissue engineering and controlled release applications, but its low bioactivity and weak mechanical performance limits its applications. In this work, nanosized bioglasses with two different compositions (SiO2–CaO and SiO2–CaO–P2O5) were synthesized with a hydrothermal method, and each one was used as filler in the preparation of PCL nanocomposites via the in situ ring opening polymerization of ε-caprolactone. The effect of the addition of 0.5, 1 and 2.5 wt % of the nanofillers on the molecular weight, structural, mechanical and thermal properties of the polymer nanocomposites, as well as on their enzymatic hydrolysis rate, bioactivity and biocompatibility was systematically investigated. All nanocomposites exhibited higher molecular weight values in comparison with neat PCL, and mechanical properties were enhanced for the 0.5 and 1 wt % filler content, which was attributed to extensive interactions between the filler and the matrix, proving the superiority of in situ polymerization over solution mixing and melt compounding. Both bioglasses accelerated the enzymatic degradation of PCL and induced bioactivity, since apatite was formed on the surface of the nanocomposites after soaking in simulated body fluid. Finally, all samples were biocompatible as Wharton jelly-derived mesenchymal stem cells (WJ-MSCs) attached and proliferated on their surfaces.
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Affiliation(s)
- Zoi Terzopoulou
- Laboratory of Polymers Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Greece.
| | - Diana Baciu
- National Center for Scientific Research "Demokritos", Ag. Paraskevi Attikis, Athens GR15341, Greece.
| | - Eleni Gounari
- Biohellenika Biotechnology Company, Leoforos Georgikis Scholis 65, GR57001 Thessaloniki, Greece.
| | - Theodore Steriotis
- National Center for Scientific Research "Demokritos", Ag. Paraskevi Attikis, Athens GR15341, Greece.
| | - Georgia Charalambopoulou
- National Center for Scientific Research "Demokritos", Ag. Paraskevi Attikis, Athens GR15341, Greece.
| | - Dimitrios Bikiaris
- Laboratory of Polymers Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR54124 Thessaloniki, Greece.
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Heere M, Zavorotynska O, Deledda S, Sørby MH, Book D, Steriotis T, Hauback BC. Effect of additives, ball milling and isotopic exchange in porous magnesium borohydride. RSC Adv 2018; 8:27645-27653. [PMID: 35542747 PMCID: PMC9083490 DOI: 10.1039/c8ra05146a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 07/19/2018] [Indexed: 02/03/2023] Open
Abstract
Magnesium borohydride (Mg(BH4)2) is a promising material for solid state hydrogen storage. However, the predicted reversible hydrogen sorption properties at moderate temperatures have not been reached due to sluggish hydrogen sorption kinetics. Hydrogen (H) → deuterium (D) exchange experiments can contribute to the understanding of the stability of the BH4− anion. Pure γ-Mg(BH4)2, ball milled Mg(BH4)2 and composites with the additives nickel triboride (Ni3B) and diniobium pentaoxide (Nb2O5) have been investigated. In situ Raman analysis demonstrated that in pure γ-Mg(BH4)2 the isotopic exchange reaction during continuous heating started at ∼80 °C, while the ball milled sample did not show any exchange at 3 bar D2. However, during ex situ exchange reactions investigated by infrared (IR) and thermogravimetric (TG) analyses a comparable H → D exchange during long exposures (23 h) to deuterium atmosphere was observed for as received, ball milled and γ-Mg(BH4)2 + Nb2O5, while the Ni3B additive hindered isotopic exchange. The specific surface areas (SSA) were shown to be very different for as received γ-Mg(BH4)2, BET area = 900 m2 g−1, and ball milled Mg(BH4)2, BET area = 30 m2 g−1, respectively, and this explains why no gas–solid H(D) diffusion was observed for the ball milled (amorphous) Mg(BH4)2 during the short time frames of in situ Raman measurements. The heat treated ball milled sample partially regained the porous γ-Mg(BH4)2 structure (BET area = 560 m2 g−1). This in combination with the long reaction times allowing for the reaction to approach equilibrium explains the observed gas–solid H(D) diffusion during long exposure. We have also demonstrated that a small amount of D can be substituted in both high surface area and low surface area samples at room temperature proving that the B–H bonds in Mg(BH4)2 can be challenged at these mild conditions. Specific surface area measurements (BET) of as received and ball milled samples showed the collapse of the porous network after milling, while a heat treated ball milled sample regained most of its porous γ-Mg(BH4)2 structure.![]()
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Affiliation(s)
- Michael Heere
- Department for Neutron Materials Characterization
- Institute for Energy Technology
- Norway
- Institute for Applied Materials – Energy Storage Systems (IAM – ESS)
- Karlsruhe Institute of Technology (KIT)
| | - Olena Zavorotynska
- Department for Neutron Materials Characterization
- Institute for Energy Technology
- Norway
- Institute for Mathematics and Physics
- University of Stavanger
| | - Stefano Deledda
- Department for Neutron Materials Characterization
- Institute for Energy Technology
- Norway
| | - Magnus H. Sørby
- Department for Neutron Materials Characterization
- Institute for Energy Technology
- Norway
| | - David Book
- School of Metallurgy and Materials
- University of Birmingham
- Birmingham B15 2TT
- UK
| | - Theodore Steriotis
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- Athens 15341
- Greece
| | - Bjørn C. Hauback
- Department for Neutron Materials Characterization
- Institute for Energy Technology
- Norway
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15
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Pavlenko D, Giasafaki D, Charalambopoulou G, van Geffen E, Gerritsen KGF, Steriotis T, Stamatialis D. Carbon Adsorbents With Dual Porosity for Efficient Removal of Uremic Toxins and Cytokines from Human Plasma. Sci Rep 2017; 7:14914. [PMID: 29097715 PMCID: PMC5668241 DOI: 10.1038/s41598-017-15116-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 10/20/2017] [Indexed: 11/28/2022] Open
Abstract
The number of patients with chronic kidney disease increases while the number of available donor organs stays at approximately the same level. Unavoidable accumulation of the uremic toxins and cytokines for these patients comes as the result of malfunctioning kidneys and their high levels in the blood result in high morbidity and mortality. Unfortunately, the existing methods, like hemodialysis and hemofiltration, provide only partial removal of uremic toxins and/or cytokines from patients' blood. Consequently, there is an increasing need for the development of the extracorporeal treatments which will enable removal of broad spectrum of uremic toxins that are usually removed by healthy kidneys. Therefore, in this work we developed and tested ordered mesoporous carbons as new sorbents with dual porosity (micro/meso) that provide selective and efficient removal of a broad range of uremic toxins from human plasma. The new sorbents, CMK-3 are developed by nanocasting methods and have two distinct pore domains, i.e. micropores and mesopores, therefore show high adsorption capacity towards small water soluble toxins (creatinine), protein-bound molecules (indoxyl sulfate and hippuric acid), middle molecules (β-2-microglobulin) and cytokines of different size (IL-6 and IL-8). Our results show that small amounts of CMK-3 could provide selective and complete blood purification.
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Affiliation(s)
- D Pavlenko
- (Bio)artificial organs, Department of Biomaterials Science and Technology, MIRA Institute for Biomedical Engineering and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - D Giasafaki
- National Center for Scientific Research "Demokritos", Agia Paraskevi Attikis, 15341, Athens, Greece
| | - G Charalambopoulou
- National Center for Scientific Research "Demokritos", Agia Paraskevi Attikis, 15341, Athens, Greece
| | - E van Geffen
- (Bio)artificial organs, Department of Biomaterials Science and Technology, MIRA Institute for Biomedical Engineering and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - K G F Gerritsen
- Department of Nephrology and Hypertension, University Medical Centre Utrecht, P.O. Box 85500, 3508 GA, Utrecht, The Netherlands
| | - T Steriotis
- National Center for Scientific Research "Demokritos", Agia Paraskevi Attikis, 15341, Athens, Greece
| | - D Stamatialis
- (Bio)artificial organs, Department of Biomaterials Science and Technology, MIRA Institute for Biomedical Engineering and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
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Eleftheriadis GK, Filippousi M, Tsachouridou V, Darda MA, Sygellou L, Kontopoulou I, Bouropoulos N, Steriotis T, Charalambopoulou G, Vizirianakis IS, Van Tendeloo G, Fatouros DG. Evaluation of mesoporous carbon aerogels as carriers of the non-steroidal anti-inflammatory drug ibuprofen. Int J Pharm 2016; 515:262-270. [PMID: 27717918 DOI: 10.1016/j.ijpharm.2016.10.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 10/01/2016] [Accepted: 10/04/2016] [Indexed: 10/20/2022]
Abstract
Towards the development of novel drug carriers for oral delivery of poorly soluble drugs mesoporous aerogel carbons (CAs), namely CA10 and CA20 with different pore sizes (10 and 20nm, respectively), were evaluated. The non-steroidal anti-inflammatory lipophilic compound ibuprofen was incorporated via passive loading. The drug loaded carbon aerogels were systemically investigated by means of High-Resolution Transmission Electron Microscopy (HR-TEM), Nitrogen physisorption studies, X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), X-ray photon electron spectroscopy (XPS) and ζ-potential studies. In vitro release studies were performed in simulated intestinal fluids reflecting both fasted (FaSSIF) and fed (FeSSIF) state conditions. Cytotoxicity studies were conducted with human intestinal cells (Caco-2). Drug was in an amorphous state in the pores of the carbon carrier as shown from the physicochemical characterization studies. The results showed marked differences in the release profiles for ibuprofen from the two aerogels in the media tested whereas in vitro toxicity profiles appear to be compatible with potential therapeutic applications at low concentrations.
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Affiliation(s)
- Georgios K Eleftheriadis
- School of Pharmacy, Department of Pharmaceutical Technology, Aristotle University of Thessaloniki, GR-54124, Greece
| | - Maria Filippousi
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Vassiliki Tsachouridou
- School of Pharmacy, Department of Pharmacology, Aristotle University of Thessaloniki, GR-54124, Greece; Foundation for Research and Technology, Hellas-Institute of Chemical Engineering and High Temperature Chemical Processes (FORTH/ICE-HT), P.O. Box 1414, GR-26504 Patras, Greece
| | - Maria-Anna Darda
- School of Pharmacy, Department of Pharmaceutical Technology, Aristotle University of Thessaloniki, GR-54124, Greece
| | - Lamprini Sygellou
- Foundation for Research and Technology, Hellas-Institute of Chemical Engineering and High Temperature Chemical Processes (FORTH/ICE-HT), P.O. Box 1414, GR-26504 Patras, Greece
| | - Ioanna Kontopoulou
- Department of Materials Science, University of Patras, 26504 Rio, Patras, Greece
| | - Nikolaos Bouropoulos
- Department of Materials Science, University of Patras, 26504 Rio, Patras, Greece
| | - Theodore Steriotis
- National Center for Scientific Research "Demokritos", 15341 Agia Paraskevi Attikis, Greece
| | | | - Ioannis S Vizirianakis
- School of Pharmacy, Department of Pharmacology, Aristotle University of Thessaloniki, GR-54124, Greece
| | | | - Dimitrios G Fatouros
- School of Pharmacy, Department of Pharmaceutical Technology, Aristotle University of Thessaloniki, GR-54124, Greece.
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17
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Gotzias A, Charalambopoulou G, Steriotis T. On the orientation of N2and CO2molecules adsorbed in slit pore models with oxidised graphitic surface. Molecular Simulation 2015. [DOI: 10.1080/08927022.2015.1032275] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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18
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Abstract
The surface geometry of Vycor porous glass was examined by using the relative permeability (PR) technique in a H2O/He system. At a water relative pressure of approximately 0.3, a maximum is observed on the PR curve. This maximum is explained in terms of geometrical changes taking place due to the deposition of a water film on the internal Vycor surface. When the sample is dry, diffusion in a fractal system is found to be more appropriate in describing the process. When the sample is wet, the diffusion process obeys classical Knudsen theory for smooth cylinders. Copyright 1998 Academic Press.
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Affiliation(s)
- PK Makri
- Institute of Physical Chemistry, National Centre for Scientific Research "Demokritos", 153 10 Ag. Paraskevi Attikis, Athens, Greece
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