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Cherednichenko K, Bardina K, Vishnevich A, Gablina M, Gataulina A, Nikolaev Y, Gushchin P, Ivanov E, Kopitsyn D, Vinokurov V. A Facile One-Step Synthesis of Polystyrene/Cellulose (PS@MFC) Biocomposites for the Preparation of Hybrid Water-Absorbing Sponge Materials. Polymers (Basel) 2023; 15:4328. [PMID: 37960008 PMCID: PMC10648625 DOI: 10.3390/polym15214328] [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: 09/30/2023] [Revised: 10/21/2023] [Accepted: 11/03/2023] [Indexed: 11/15/2023] Open
Abstract
The elaboration of a low-cost and effective approach to synthesize hybrid composite materials based on the conventional thermoplastics and natural biopolymers is a sustainable alternative to the production of "traditional" plastics. Cellulose is one of the most abundant biopolymers. Its fibrils possess outstanding mechanical characteristics and, hence, attract considerable interest of researchers during recent decades. However, modification of the hydrophobic polymer matrix by cellulose fibrils is significantly complicated by the hydrophilic nature of the latter. In this study, we propose an effective and low-cost approach to the synthesis of polystyrene at the cellulose microfibrils composite material via the emulsion polymerization method. The obtained fibrous composite was comprehensively analyzed with FTIR spectroscopy, SEM, TGA, and DSC, and was further employed to produce sponge hybrid materials. We investigated the influence of the cellulose/polystyrene ratio on the density, porosity, pore volume, and water uptake of the obtained sponge materials. The sample containing 70 wt.% of cellulose demonstrated the best water absorption properties while preserving its shape, even after 24 h of floating on water. The produced sponge materials might be employed as sorption materials for the purification and desalination of waters of various origins, filtration, and collection of undesirable elements under specific industrial or natural conditions.
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Affiliation(s)
- Kirill Cherednichenko
- Department of Physical and Colloidal Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas (Gubkin University), 65 Leninsky Prospekt, 119991 Moscow, Russia; (K.B.); (A.G.); (E.I.)
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2
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Vasilev A, Efimov M, Muratov D, Chernavskii P, Cherednichenko K, Dzidziguri E, Karpacheva G. Fe-Co Alloy Nanoparticles Dispersed in Polymer-Derived Carbon Support: Effect of Initial Polymer Nature on the Size, Structure and Magnetic Properties. Materials (Basel) 2023; 16:6694. [PMID: 37895676 PMCID: PMC10608119 DOI: 10.3390/ma16206694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/02/2023] [Accepted: 10/12/2023] [Indexed: 10/29/2023]
Abstract
Fe-Co alloy nanoparticles with different sizes, supported by carbon derived from several polymers, namely polyacrylonitrile, polyvinyl alcohol and chitosan, have been synthesized by a one-pot method involving simultaneous metal nanoparticle formation and polymer carbonization. The method involves the joint dissolution of metal salts and a polymer, followed by annealing of the resulting dried film. Detailed XRD analysis confirmed the formation of Fe-Co alloy nanoparticles in each sample, regardless of the initial polymer used. Transmission electron microscopy images showed that the Fe-Co nanoparticles were all spherical, were homogeneously distributed within the carbon support and varied by size depending on the initial polymer nature and synthesis temperature. Fe-Co nanoparticles supported by polyacrylonitrile-derived carbon exhibited the smallest size (6-12 nm), whereas nanoparticles on chitosan-derived carbon support were characterized by the largest particle size (13-38 nm). The size dependence of magnetic properties were studied by a vibrating sample magnetometer at room temperature. For the first time, the critical particle size of Fe-Co alloy nanoparticles with equiatomic composition has been experimentally determined as 13 nm, indicating the transition of magnetic properties from ferromagnetic to superparamagnetic.
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Affiliation(s)
- Andrey Vasilev
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, Moscow 119991, Russia; (A.V.); (M.E.); (D.M.); (P.C.)
| | - Mikhail Efimov
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, Moscow 119991, Russia; (A.V.); (M.E.); (D.M.); (P.C.)
| | - Dmitry Muratov
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, Moscow 119991, Russia; (A.V.); (M.E.); (D.M.); (P.C.)
| | - Petr Chernavskii
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, Moscow 119991, Russia; (A.V.); (M.E.); (D.M.); (P.C.)
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1–3, Moscow 119991, Russia
| | - Kirill Cherednichenko
- Department of Physical and Colloidal Chemistry, National University of Oil and Gas “Gubkin University”, Leninskiy Prospekt 65, Moscow 119991, Russia;
| | - Ella Dzidziguri
- Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology “MISiS”, Leninskiy Prospekt 4, Moscow 119049, Russia;
| | - Galina Karpacheva
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, Moscow 119991, Russia; (A.V.); (M.E.); (D.M.); (P.C.)
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3
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Cherednichenko K, Sayfutdinova A, Rimashevskiy D, Malik B, Panchenko A, Kopitsyna M, Ragnaev S, Vinokurov V, Voronin D, Kopitsyn D. Composite Bone Cements with Enhanced Drug Elution. Polymers (Basel) 2023; 15:3757. [PMID: 37765611 PMCID: PMC10535863 DOI: 10.3390/polym15183757] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 07/07/2023] [Revised: 09/07/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
Antibiotic-loaded bone cement (ALBC) has become an indispensable material in orthopedic surgery in recent decades, owing to the possibility of drugs delivery to the surgical site. It is applied for both infection prophylaxis (e.g., in primary joint arthroplasty) and infection treatment (e.g., in periprosthetic infection). However, the introduction of antibiotic to the polymer matrix diminishes the mechanical strength of the latter. Moreover, the majority of the loaded antibiotic remains embedded in polymer and does not participate in drug elution. Incorporation of the various additives to ALBC can help to overcome these issues. In this paper, four different natural micro/nanoscale materials (halloysite, nanocrystalline cellulose, micro- and nanofibrillated cellulose) were tested as additives to commercial Simplex P bone cement preloaded with vancomycin. The influence of all four materials on the polymerization process was comprehensively studied, including the investigation of the maximum temperature of polymerization, setting time, and monomer leaching. The introduction of the natural additives led to a considerable enhancement of drug elution and microhardness in the composite bone cements compared to ALBC. The best combination of the polymerization rate, monomer leaching, antibiotic release, and microhardness was observed for the sample containing nanofibrillated cellulose (NFC).
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Affiliation(s)
- Kirill Cherednichenko
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas “Gubkin University”, Moscow 119991, Russia; (K.C.)
| | - Adeliya Sayfutdinova
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas “Gubkin University”, Moscow 119991, Russia; (K.C.)
| | - Denis Rimashevskiy
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas “Gubkin University”, Moscow 119991, Russia; (K.C.)
- Department of Traumatology and Orthopedics, Peoples’ Friendship University of Russia, Moscow 117198, Russia
| | - Birzhan Malik
- Astana Medical University, Beybitshilik Street 49a, Astana 010000, Kazakhstan
| | - Andrey Panchenko
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas “Gubkin University”, Moscow 119991, Russia; (K.C.)
| | - Maria Kopitsyna
- Russian Institute for Scientific and Technical Information “VINITI RAS”, Moscow 125190, Russia
| | - Stanislav Ragnaev
- Multidisciplinary Hospital Named after Professor Kh.Zh. Makazhanov, Karaganda 100000, Kazakhstan
| | - Vladimir Vinokurov
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas “Gubkin University”, Moscow 119991, Russia; (K.C.)
| | - Denis Voronin
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas “Gubkin University”, Moscow 119991, Russia; (K.C.)
| | - Dmitry Kopitsyn
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas “Gubkin University”, Moscow 119991, Russia; (K.C.)
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4
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Cherednichenko K, Kopitsyn D, Smirnov E, Nikolaev N, Fakhrullin R. Fireproof Nanocomposite Polyurethane Foams: A Review. Polymers (Basel) 2023; 15:polym15102314. [PMID: 37242889 DOI: 10.3390/polym15102314] [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: 04/18/2023] [Revised: 05/08/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023] Open
Abstract
First introduced in 1954, polyurethane foams rapidly became popular because of light weight, high chemical stability, and outstanding sound and thermal insulation properties. Currently, polyurethane foam is widely applied in industrial and household products. Despite tremendous progress in the development of various formulations of versatile foams, their use is hindered due to high flammability. Fire retardant additives can be introduced into polyurethane foams to enhance their fireproof properties. Nanoscale materials employed as fire-retardant components of polyurethane foams have the potential to overcome this problem. Here, we review the recent (last 5 years) progress that has been made in polyurethane foam modification using nanomaterials to enhance its flame retardance. Different groups of nanomaterials and approaches for incorporating them into foam structures are covered. Special attention is given to the synergetic effects of nanomaterials with other flame-retardant additives.
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Affiliation(s)
- Kirill Cherednichenko
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas "Gubkin University", Moscow 119991, Russia
| | - Dmitry Kopitsyn
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas "Gubkin University", Moscow 119991, Russia
| | - Egor Smirnov
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas "Gubkin University", Moscow 119991, Russia
| | - Nikita Nikolaev
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas "Gubkin University", Moscow 119991, Russia
| | - Rawil Fakhrullin
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas "Gubkin University", Moscow 119991, Russia
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml Uramı 18, Kazan 420008, Russia
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Voronin D, Mendgaziev R, Sayfutdinova A, Kugai M, Rubtsova M, Cherednichenko K, Shchukin D, Vinokurov V. Phase-Change Microcapsules with a Stable Polyurethane Shell through the Direct Crosslinking of Cellulose Nanocrystals with Polyisocyanate at the Oil/Water Interface of Pickering Emulsion. Materials (Basel) 2022; 16:29. [PMID: 36614367 PMCID: PMC9821122 DOI: 10.3390/ma16010029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/15/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
Phase-change materials (PCMs) attract much attention with regard to their capability of mitigating fossil fuel-based heating in in-building applications, due to the responsive accumulation and release of thermal energy as a latent heat of reversible phase transitions. Organic PCMs possess high latent heat storage capacity and thermal reliability. However, bare PCMs suffer from leakages in the liquid form. Here, we demonstrate a reliable approach to improve the shape stability of organic PCM n-octadecane by encapsulation via interfacial polymerization at an oil/water interface of Pickering emulsion. Cellulose nanocrystals are employed as emulsion stabilizers and branched oligo-polyol with high functionality to crosslink the polyurethane shell in reaction with polyisocyanate dissolved in the oil core. This gives rise to a rigid polyurethane structure with a high density of urethane groups. The formation of a polyurethane shell and successful encapsulation of n-octadecane is confirmed by FTIR spectroscopy, XRD analysis, and fluorescent confocal microscopy. Electron microscopy reveals the formation of non-aggregated capsules with an average size of 18.6 µm and a smooth uniform shell with the thickness of 450 nm. The capsules demonstrate a latent heat storage capacity of 79 J/g, while the encapsulation of n-octadecane greatly improves its shape and thermal stability compared with bulk paraffin.
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Affiliation(s)
- Denis Voronin
- Department of Physical and Colloid Chemistry, National University of Oil and Gas ”Gubkin University”, 119991 Moscow, Russia
| | - Rais Mendgaziev
- Department of Physical and Colloid Chemistry, National University of Oil and Gas ”Gubkin University”, 119991 Moscow, Russia
| | - Adeliya Sayfutdinova
- Department of Physical and Colloid Chemistry, National University of Oil and Gas ”Gubkin University”, 119991 Moscow, Russia
| | - Maria Kugai
- Department of Physical and Colloid Chemistry, National University of Oil and Gas ”Gubkin University”, 119991 Moscow, Russia
| | - Maria Rubtsova
- Department of Physical and Colloid Chemistry, National University of Oil and Gas ”Gubkin University”, 119991 Moscow, Russia
| | - Kirill Cherednichenko
- Department of Physical and Colloid Chemistry, National University of Oil and Gas ”Gubkin University”, 119991 Moscow, Russia
| | - Dmitry Shchukin
- Department of Chemistry, Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool L69 7ZD, UK
| | - Vladimir Vinokurov
- Department of Physical and Colloid Chemistry, National University of Oil and Gas ”Gubkin University”, 119991 Moscow, Russia
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6
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Vinokurov A, Popelensky V, Bubenov S, Kononov N, Cherednichenko K, Kuznetsova T, Dorofeev S. Recrystallization of Si Nanoparticles in Presence of Chalcogens: Improved Electrical and Optical Properties. Materials (Basel) 2022; 15:8842. [PMID: 36556648 PMCID: PMC9787536 DOI: 10.3390/ma15248842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/06/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Nanocrystals of Si doped with S, Se and Te were synthesized by annealing them in chalcogen vapors in a vacuum at a high temperature range from 800 to 850 °C. The influence of the dopant on the structure and morphology of the particles and their optical and electrical properties was studied. In the case of all three chalcogens, the recrystallization of Si was observed, and XRD peaks characteristic of noncubic Si phases were found by means of electronic diffraction for Si doped with S and Se. Moreover, in presence of S and Te, crystalline rods with six-sided and four-sided cross-sections, respectively, were formed, their length reaching hundreds of μm. Samples with sulfur and selenium showed high conductivity compared to the undoped material.
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Affiliation(s)
- Alexander Vinokurov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1–3, 119991 Moscow, Russia
| | - Vadim Popelensky
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1–3, 119991 Moscow, Russia
| | - Sergei Bubenov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1–3, 119991 Moscow, Russia
| | - Nikolay Kononov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, St. Vavilov, 38, 119991 Moscow, Russia
| | - Kirill Cherednichenko
- Department of Colloidal and Physical Chemistry, Gubkin Russian State University of Oil and Gas, Leninsky Avenue, 65, 119991 Moscow, Russia
| | - Tatyana Kuznetsova
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1–3, 119991 Moscow, Russia
| | - Sergey Dorofeev
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1–3, 119991 Moscow, Russia
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Sayfutdinova A, Samofalova I, Barkov A, Cherednichenko K, Rimashevskiy D, Vinokurov V. Structure and Properties of Cellulose/Mycelium Biocomposites. Polymers (Basel) 2022; 14:polym14081519. [PMID: 35458267 PMCID: PMC9030294 DOI: 10.3390/polym14081519] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 03/12/2022] [Revised: 03/30/2022] [Accepted: 04/06/2022] [Indexed: 01/29/2023] Open
Abstract
The current environmental problems require the use of low-energy, environmentally friendly methods and nature-like technologies for the creation of materials. In this work, we aim to study the possibility of the direct biotransformation of fibrillar cellulose by fungi through obtaining a cellulose/mycelium-based biocomposite. The cellulose micro- and nanofibrils were used as the main carbon sources in the solid-phase cultivation of basidiomycete Trametes hirsuta. The cellulose fibrils in this process act as a template for growing mycelium with the formation of well-developed net structure. The biotransformation dynamics of cellulose fibrils were studied with the help of scanning electron microscopy. The appearance of nitrogen in the structure of formed fibers was revealed by elemental analysis and FTIR-spectroscopy. The fibers diameters were estimated based on micrograph analysis and the laser diffraction method. It was shown that the diameter of cellulose fibrils can be tuned by fungi through obtaining cellulose-based mycelium fibers with a narrower diameter-size distribution as compared to the pristine cellulose fibrils. The morphology of the resulting mycelium differed when the micro or nanofibrils were used as a substrate.
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Affiliation(s)
- Adeliya Sayfutdinova
- Department of Physical and Colloidal Chemistry, Gubkin University, 119991 Moscow, Russia; (I.S.); (A.B.)
- Correspondence: (A.S.); (K.C.); (V.V.)
| | - Irina Samofalova
- Department of Physical and Colloidal Chemistry, Gubkin University, 119991 Moscow, Russia; (I.S.); (A.B.)
| | - Artem Barkov
- Department of Physical and Colloidal Chemistry, Gubkin University, 119991 Moscow, Russia; (I.S.); (A.B.)
| | - Kirill Cherednichenko
- Department of Physical and Colloidal Chemistry, Gubkin University, 119991 Moscow, Russia; (I.S.); (A.B.)
- Correspondence: (A.S.); (K.C.); (V.V.)
| | - Denis Rimashevskiy
- Department of Traumatology and Orthopedics, RUDN University, 117198 Moscow, Russia;
| | - Vladimir Vinokurov
- Department of Physical and Colloidal Chemistry, Gubkin University, 119991 Moscow, Russia; (I.S.); (A.B.)
- Correspondence: (A.S.); (K.C.); (V.V.)
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8
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Cherednichenko K, D’Onofrio S. Operator-norm homogenisation estimates for the system of Maxwell equations on periodic singular structures. Calc Var Partial Differ Equ 2022; 61:67. [PMID: 35221543 PMCID: PMC8827329 DOI: 10.1007/s00526-021-02139-7] [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] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 10/28/2021] [Indexed: 06/14/2023]
Abstract
For arbitrarily small values of ε > 0 , we formulate and analyse the Maxwell system of equations of electromagnetism on ε -periodic sets S ε ⊂ R 3 . Assuming that a family of Borel measures μ ε , such that supp ( μ ε ) = S ε , is obtained by ε -contraction of a fixed 1-periodic measure μ , and for right-hand sides f ε ∈ L 2 ( R 3 , d μ ε ) , we prove order-sharp norm-resolvent convergence estimates for the solutions of the system. Our analysis includes the case of periodic "singular structures", when μ is supported by lower-dimensional manifolds. The estimates are obtained by combining several new tools we develop for analysing the Floquet decomposition of an elliptic differential operator on functions from Sobolev spaces with respect to a periodic Borel measure. These tools include a generalisation of the classical Helmholtz decomposition for L 2 functions, an associated Poincaré-type inequality, uniform with respect to the parameter of the Floquet decomposition, and an appropriate asymptotic expansion inspired by the classical power series. Our technique does not involve any spectral analysis and does not rely on the existing approaches, such as Bloch wave homogenisation or the spectral germ method.
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Affiliation(s)
- Kirill Cherednichenko
- Department of Mathematical Sciences, University of Bath, Claverton Down, Bath, BA2 7AY UK
| | - Serena D’Onofrio
- Department of Mathematical Sciences, University of Bath, Claverton Down, Bath, BA2 7AY UK
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F. De Castro P, Minko S, Vinokurov V, Cherednichenko K, Shchukin DG. Long-Term Autonomic Thermoregulating Fabrics Based on Microencapsulated Phase Change Materials. ACS Appl Energy Mater 2021; 4:12789-12797. [PMID: 35128339 PMCID: PMC8806139 DOI: 10.1021/acsaem.1c02170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 10/18/2021] [Indexed: 06/14/2023]
Abstract
Microcapsules loaded with n-docosane as phase change material (mPCMs) for thermal energy storage with a phase change transition temperature in the range of 36-45 °C have been employed to impregnate cotton fabrics. Fabrics impregnated with 8 wt % of mPCMs provided 11 °C of temperature buffering effect during heating. On the cooling step, impregnated fabrics demonstrated 6 °C temperature increase for over 100 cycles of switching on/off of the heating source. Similar thermoregulating performance was observed for impregnated fabrics stored for 4 years (1500 days) at room temperature. Temperature buffering effect increased to 14 °C during heating cycle and temperature increase effect reached 9 °C during cooling cycle in the aged fabric composites. Both effects remained stable in aged fabrics for more than 100 heating/cooling cycles. Our study demonstrates high potential use of the microencapsulated n-docosane for thermal management applications, including high-technical textiles, footwear materials, and building thermoregulating covers and paints with high potential for commercial applications.
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Affiliation(s)
- Paula F. De Castro
- Leitat
Technological Center, C/Innovació 2, 08225, Terrassa, Barcelona Spain
| | - Sergiy Minko
- Department
of Chemistry, University of Georgia, 0305 Dawson Hall, Athens, Georgia 30602, United States
| | | | | | - Dmitry G. Shchukin
- Gubkin
University, 65/1 Leninsky Prospect,19991, Moscow, Russia
- Stephenson
Institute for Renewable Energy, University
of Liverpool, Chadwick Building, Peach Street, Liverpool L69 7ZF, United Kingdom
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Cherednichenko K, Kopitsyn D, Batasheva S, Fakhrullin R. Probing Antimicrobial Halloysite/Biopolymer Composites with Electron Microscopy: Advantages and Limitations. Polymers (Basel) 2021; 13:3510. [PMID: 34685269 PMCID: PMC8538282 DOI: 10.3390/polym13203510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/29/2021] [Accepted: 10/08/2021] [Indexed: 01/07/2023] Open
Abstract
Halloysite is a tubular clay nanomaterial of the kaolin group with a characteristic feature of oppositely charged outer and inner surfaces, allowing its selective spatial modification. The natural origin and specific properties of halloysite make it a potent material for inclusion in biopolymer composites with polysaccharides, nucleic acids and proteins. The applications of halloysite/biopolymer composites range from drug delivery and tissue engineering to food packaging and the creation of stable enzyme-based catalysts. Another important application field for the halloysite complexes with biopolymers is surface coatings resistant to formation of microbial biofilms (elaborated communities of various microorganisms attached to biotic or abiotic surfaces and embedded in an extracellular polymeric matrix). Within biofilms, the microorganisms are protected from the action of antibiotics, engendering the problem of hard-to-treat recurrent infectious diseases. The clay/biopolymer composites can be characterized by a number of methods, including dynamic light scattering, thermo gravimetric analysis, Fourier-transform infrared spectroscopy as well as a range of microscopic techniques. However, most of the above methods provide general information about a bulk sample. In contrast, the combination of electron microscopy with energy-dispersive X-ray spectroscopy allows assessment of the appearance and composition of biopolymeric coatings on individual nanotubes or the distribution of the nanotubes in biopolymeric matrices. In this review, recent contributions of electron microscopy to the studies of halloysite/biopolymer composites are reviewed along with the challenges and perspectives in the field.
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Affiliation(s)
- Kirill Cherednichenko
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas «Gubkin University», 65 Leninsky Prospekt, 119991 Moscow, Russia; (K.C.); (D.K.)
| | - Dmitry Kopitsyn
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas «Gubkin University», 65 Leninsky Prospekt, 119991 Moscow, Russia; (K.C.); (D.K.)
| | - Svetlana Batasheva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı, 18, 420008 Kazan, Republic of Tatarstan, Russia;
| | - Rawil Fakhrullin
- Department of Physical and Colloid Chemistry, Faculty of Chemical and Environmental Engineering, National University of Oil and Gas «Gubkin University», 65 Leninsky Prospekt, 119991 Moscow, Russia; (K.C.); (D.K.)
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı, 18, 420008 Kazan, Republic of Tatarstan, Russia;
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11
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Akopyan A, Polikarpova P, Vutolkina A, Cherednichenko K, Stytsenko V, Glotov A. Natural clay nanotube supported Mo and W catalysts for exhaustive oxidative desulfurization of model fuels. PURE APPL CHEM 2021. [DOI: 10.1515/pac-2020-0901] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Abstract
Oxidative desulfurization is a promising way to produce, under mild conditions, clean ecological fuels with ultra-low sulfur content. Herein, we present for the first time heterogeneous catalysts based on natural aluminosilicate nanotubes (halloysite) loaded with transition metal oxides for oxidative sulfur removal using hydrogen peroxide as environmentally safe oxidant. The halloysite nanotubes (HNTs) provide acid sites for C–S bond scission, while the Mo and W oxides act as hydrogen peroxide activators. The structure and acidity of both the clay support and catalysts were investigated by low-temperature nitrogen adsorption/desorption, Fourier-transform infrared spectroscopy, X-ray fluorescence analysis, and transmission electron microscopy techniques. These clay-based catalysts revealed the high activity in the oxidation of various classes of sulfur-containing compounds (sulfides, heteroatomic sulfur compounds) under mild reaction conditions. The conversion of various substrates decreases in the following trend: MeSPh > Bn2S > DBT > 4-MeDBT > BT, which deals with substrate electron density and steric hindrance. The influence of the temperature, oxidant to sulfur molar ratio, and reaction time on catalytic behavior was evaluated for Mo- and W-containing systems with various metal content. The complete oxidation of the most intractable dibenzothiophene to the corresponding sulfone was achieved at 80 °C and H2O2:S = 6:1 (molar) for 2 h both for Mo- and W-containing systems. These transition metal oxides HNTs supported catalysts are stable for 10 cycles of dibenzothiophene oxidation, which makes them promising systems for clean fuel production.
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Affiliation(s)
- Argam Akopyan
- Department of Petroleum Chemistry and Organic Catalysis , Faculty of Chemistry, Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory , 119991 Moscow , Russia
| | - Polina Polikarpova
- Department of Petroleum Chemistry and Organic Catalysis , Faculty of Chemistry, Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory , 119991 Moscow , Russia
| | - Anna Vutolkina
- Department of Petroleum Chemistry and Organic Catalysis , Faculty of Chemistry, Lomonosov Moscow State University , GSP-1, 1-3 Leninskiye Gory , 119991 Moscow , Russia
| | - Kirill Cherednichenko
- Department of Physical and Colloid Chemistry , Faculty of Chemical and Environmental Engineering, Gubkin Russian State University of Oil and Gas (NRU) , 65 Leninsky Prospekt , 119991 Moscow , Russia
| | - Valentine Stytsenko
- Department of Physical and Colloid Chemistry , Faculty of Chemical and Environmental Engineering, Gubkin Russian State University of Oil and Gas (NRU) , 65 Leninsky Prospekt , 119991 Moscow , Russia
| | - Aleksandr Glotov
- Department of Physical and Colloid Chemistry , Faculty of Chemical and Environmental Engineering, Gubkin Russian State University of Oil and Gas (NRU) , 65 Leninsky Prospekt , 119991 Moscow , Russia
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Cherednichenko K, Graham W. Frequency-dependent impedance and surface waves on the boundary of a stratified dielectric medium. Philos Trans A Math Phys Eng Sci 2019; 377:20190218. [PMID: 31474199 PMCID: PMC6732373 DOI: 10.1098/rsta.2019.0218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/25/2019] [Indexed: 05/30/2023]
Abstract
We analyse waves propagating along the interface between half-spaces filled with a perfect dielectric and a Lorentz material. We show that the corresponding interface condition leads to a generalization of the classical Leontovich condition on the boundary of a dielectric half-space. We study when this condition supports propagation of (dispersive) surface waves. We derive the related dispersion relation for waves along the boundary of a stratified half-space and determine the relationship between the loss parameter, frequency and wavenumber for which interfacial waves exist. This article is part of the theme issue 'Modelling of dynamic phenomena and localization in structured media (part 1)'.
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Carrillo C, Cherednichenko K, Britton N, Mogie M. Dynamic coexistence of sexual and asexual invasion fronts in a system of integro-difference equations. Bull Math Biol 2009; 71:1612-25. [PMID: 19387743 DOI: 10.1007/s11538-009-9416-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2008] [Accepted: 03/25/2009] [Indexed: 10/20/2022]
Abstract
The role of long-range dispersal in the coexistence of sexual and asexual relatives in a population of hermaphrodite flowering plants is investigated. In these populations, growth and reproduction often occur during a sedentary stage that is then followed by dispersal of propagules. These two stages are clearly distinguishable and show strong seasonality. A modeling approach that accurately describes this kind of dynamics of mixed populations is a system of two nonlinear integro-difference equations. It is shown that this kind of model can accommodate coexistence of the two different reproductive types.
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Affiliation(s)
- Claudia Carrillo
- School of Technology, Oxford Brookes University, Wheatley Campus, Wheatley, Oxford OX33 1HX, UK.
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