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Darwish A, El-Sayed NS, Al Kiey SA, Kamel S, Turky G. Polyanionic electrically conductive superabsorbent hydrogel based on sodium alginate-g-poly (AM-co-ECA-co-AMPS): Broadband dielectric spectroscopy investigations. Int J Biol Macromol 2023; 232:123443. [PMID: 36709806 DOI: 10.1016/j.ijbiomac.2023.123443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 01/09/2023] [Accepted: 01/24/2023] [Indexed: 01/27/2023]
Abstract
In this study, the dielectric behavior of polyanionic electrically conductive superabsorbent hydrogel based on sodium alginate-g-poly(AM-co-ECA-co-AMPS) was investigated by broadband dielectric spectroscopy (BDS). The dielectric spectra obtained from -70 to 70 °C showed a superposition of three distinctive processes, electrode polarization, charge carrier's transport, and a molecular relaxation process. These dynamic processes were further analyzed along with the effect of both temperature and reduced graphene oxide (rGO) content. The development of a clear electrochemical double layer (ECDL) at the electrode/hydrogel interface strongly supports its possible application in supercapacitors' forms of energy storage. TGA, DSC, rheology, and electrochemical properties were studied. Furthermore, when the composite hydrogel with rGO content of 2.5 % was assembled into a symmetric supercapacitor, it displayed a specific capacitance of 756 F.g-1 at 1 A.g-1 and 704 F.g-1 after 5000 cycles with high capacitance retention of 93.2 %. The superior conductivity and porous structure of the rGO composite hydrogel are credited with the hydrogel's excellent electrochemical capabilities.
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Affiliation(s)
- Abdelfattah Darwish
- Microwave Physics and Dielectrics Department, National Research Centre, 12622, Egypt.
| | | | - Sherief A Al Kiey
- Physical Chemistry Department, National Research Centre, 12622, Egypt
| | - Samir Kamel
- Cellulose and Paper Department, National Research Centre, 12622, Egypt
| | - Gamal Turky
- Microwave Physics and Dielectrics Department, National Research Centre, 12622, Egypt.
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High performance hydrogel electrodes based on sodium alginate-g-poly(AM-c o-ECA-co-AMPS for supercapacitor application. Int J Biol Macromol 2022; 218:420-430. [PMID: 35872319 DOI: 10.1016/j.ijbiomac.2022.07.117] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Revised: 06/23/2022] [Accepted: 07/16/2022] [Indexed: 11/22/2022]
Abstract
Electrochemical conductive hydrogels are being extensively explored in the fabrication of portable batteries and high-performance supercapacitors. Herein, the rational design of a new polyanionic electrically conductive hydrogels based on sodium alginate-g-poly(AM-co-ECA-co-AMPS) are described. rGO was incorporated into the hydrogel during the polymerization process generating rGO@ sodium alginate-g-poly(AM-co-ECA-co-AMPS) composite hydrogels to study the impact of rGO on the performance of the hydrogels. FT-IR, XRD, and SEM-EDX characterized the chemical composition, crystalline, and morphological structure of the new synthesized hydrogels. The electrochemical performance of as-synthesized hydrogels was investigated by cyclic voltammetry, galvanostatic, charge-discharge rate, and electrochemical impedance spectroscopy. The supercapacitor performance for ECH2.5 composite hydrogel showed a capacitance of 753 F. g-1 at 1 A. g-1 with good rate capability and cycling stability up to 5000 cycles. Thus, ECH2.5 hydrogel is a good candidate as electrode material in supercapacitor applications.
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Epoxy resin reinforced with graphene derivatives: physical and dielectric properties. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-02971-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
AbstractEpoxy resins are important industrial polymers due to their versatile properties and ease of preparation. They are used on a large scale in coating and adhesives applications. Epoxy resins are prepared by photo-curing technique or thermal curing method in presence of different hardeners. The first method is used for small areas while the latter is utilized mainly for coating applications. Graphene and its oxide have proved themselves as good fillers for epoxy resin since the formed composites demonstrated enhanced mechanical, thermal and electrical properties. This article gives insight view for synthesis techniques and properties of these composites with a deep discussion for electrical and dielectric investigations of epoxy resins loaded with threshold concentration of graphene oxide. A case study of dielectric properties of epoxy resin/modified graphene oxide composite, is presented in which effect of curing technique on dielectric behavior is explored. Although the amount of filler was kept at the threshold concentration (1% by weight) obvious change in the dielectric properties could be observed unlike the rest of properties.
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Molecular dynamics and electrical conductivity of Guanidinium based ionic liquid crystals: Influence of cation headgroup configuration. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115666] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Qu H, He S, Su H. Efficient preparation of kaolinite/methanol intercalation composite by using a Soxhlet extractor. Sci Rep 2019; 9:8351. [PMID: 31171827 PMCID: PMC6554316 DOI: 10.1038/s41598-019-44806-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 05/23/2019] [Indexed: 11/09/2022] Open
Abstract
Kaolinite/methanol intercalation composite (KMe) is a key precursor for preparing clay-based inorganic/organic hybrid materials and kaolinite nanoscrolls. However, synthesis of KMe is a time and methanol dissipative process and the complexity of this process also limits its further applications. In this study, Soxhlet extractor was introduced to synthesize an intercalation composite and KMe was efficiently synthesized in a Soxhlet extractor through a continuous displacement process by using kaolinite/DMSO intercalation composite (KD) as a precursor. The formation process of kaolinite/methanol intercalation composite was studied by X-ray diffraction (XRD) and infrared spectroscopy (IR). The results showed that the DMSO in kaolinite could be completely displaced by methanol in this process and the preparation of KMe could be completed in 8 hours, which was far faster than the reported methods. Moreover, methanol used in this process could be recycled. Furthermore, the resulting material could be successfully used to prepare kaolinite nanoscrolls in high yield.
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Affiliation(s)
- Hao Qu
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China
| | - Sihui He
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China
| | - Haiquan Su
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, China.
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Conducting hydrogel based on chitosan, polypyrrole and magnetite nanoparticles: a broadband dielectric spectroscopy study. Polym Bull (Berl) 2018. [DOI: 10.1007/s00289-018-2545-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Yildirim A, Szymoniak P, Sentker K, Butschies M, Bühlmeyer A, Huber P, Laschat S, Schönhals A. Dynamics and ionic conductivity of ionic liquid crystals forming a hexagonal columnar mesophase. Phys Chem Chem Phys 2018; 20:5626-5635. [DOI: 10.1039/c7cp08186c] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the first time, the molecular mobility of two linear-shaped tetramethylated guanidinium triflate ionic liquid crystals (ILCs) having different lengths of alkyl chains was investigated using a combination of broadband dielectric (BDS) and specific heat spectroscopy (SHS).
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Affiliation(s)
- Arda Yildirim
- Bundesanstalt für Materialforschung und -prüfung (BAM)
- Unter den Eichen 87
- 12205 Berlin
- Germany
| | - Paulina Szymoniak
- Bundesanstalt für Materialforschung und -prüfung (BAM)
- Unter den Eichen 87
- 12205 Berlin
- Germany
| | - Kathrin Sentker
- Institut für Materialphysik und -Technologie
- Technische Universität Hamburg
- Eißendorfer Str. 42
- 21073 Hamburg
- Germany
| | - Martin Butschies
- Institut für Organische Chemie
- Universität Stuttgart
- Pfaffenwaldring 55
- 70569 Stuttgart
- Germany
| | - Andrea Bühlmeyer
- Institut für Organische Chemie
- Universität Stuttgart
- Pfaffenwaldring 55
- 70569 Stuttgart
- Germany
| | - Patrick Huber
- Institut für Materialphysik und -Technologie
- Technische Universität Hamburg
- Eißendorfer Str. 42
- 21073 Hamburg
- Germany
| | - Sabine Laschat
- Institut für Organische Chemie
- Universität Stuttgart
- Pfaffenwaldring 55
- 70569 Stuttgart
- Germany
| | - Andreas Schönhals
- Bundesanstalt für Materialforschung und -prüfung (BAM)
- Unter den Eichen 87
- 12205 Berlin
- Germany
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Dalmas F, Pearson S, Gary B, Chenal JM, Bourgeat-Lami E, Prévot V, Chazeau L. Tailored microstructure and mechanical properties of nanocomposite films made from polyacrylic/LDH hybrid latexes synthesized by RAFT-mediated emulsion polymerization. Polym Chem 2018. [DOI: 10.1039/c8py00268a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
New layered double hydroxide (LDH)-filled nanocomposites with tunable microstructures and mechanical properties obtained from film-forming latexes.
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Affiliation(s)
- Florent Dalmas
- Université de Lyon
- INSA-Lyon
- CNRS MATEIS UMR5510
- F-69621 Villeurbanne
- France
| | - Samuel Pearson
- Univ Lyon
- Université Claude Bernard Lyon 1
- CPE Lyon
- CNRS
- UMR 5265
| | - Baptiste Gary
- Université de Lyon
- INSA-Lyon
- CNRS MATEIS UMR5510
- F-69621 Villeurbanne
- France
| | - Jean-Marc Chenal
- Université de Lyon
- INSA-Lyon
- CNRS MATEIS UMR5510
- F-69621 Villeurbanne
- France
| | | | - Vanessa Prévot
- Université Clermont Auvergne
- CNRS
- SIGMA Clermont
- ICCF
- F-63000 Clermont-Ferrand
| | - Laurent Chazeau
- Université de Lyon
- INSA-Lyon
- CNRS MATEIS UMR5510
- F-69621 Villeurbanne
- France
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Turky G, El-Adly R. Study of phase separation and anomalous molecular behavior of Jojoba oil using dielectric spectroscopy. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.126] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Omara SS, Turky G, Ghoneim A, Thünemann AF, Abdel Rehim MH, Schönhals A. Hyperbranched poly(amidoamine)/kaolinite nanocomposites: Structure and charge carrier dynamics. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.06.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Zhang S, Liu Q, Cheng H, Gao F, Liu C, Teppen BJ. Thermodynamic Mechanism and Interfacial Structure of Kaolinite Intercalation and Surface Modification by Alkane Surfactants with Neutral and Ionic Head Groups. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:8824-8831. [PMID: 29657661 PMCID: PMC5896017 DOI: 10.1021/acs.jpcc.6b12919] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Intercalation and surface modification of clays with surfactants are the essential process to tailor the clays' surface chemistry for their extended applications. A full understanding of the interaction mechanism of surfactants with clay surfaces is crucial to engineer clay surfaces for meeting a particular requirement of industrial applications. In this study, the thermodynamic mechanism involved in the intercalation and surface modification of methanol preintercalated kaolinite by three representative alkane surfactants with different head groups, dodecylamine, cetyltrimethylammonium chloride (CTAC), and sodium stearate, were investigated using the adaptive biasing force accelerated molecular dynamics simulations. In addition, the interaction energies of surfactants with an interlayer environment (alumina surface, siloxane surface, and interlayer methanol) of methanol preintercalated kaolinite were also calculated. It was found that the intercalation free energy of CTAC with a cationic head group was relatively larger than that of stearate with an anionic head group and dodecylamine with a neutral head group. The attractive electrostatic and van der Waals interactions of surfactants with an interlayer environment contributed to the intercalation and surface modification process with the electrostatic force playing the significant role. This study revealed the underlying mechanism involved in the intercalation and surface modification process of methanol preintercalated kaolinite by surfactants, which can help in further design of kaolinite-based organic clays with desired properties for specific applications.
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Affiliation(s)
- Shuai Zhang
- School of Geosciences and Surveying Engineering, China University of Mining &Technology (Beijing), Beijing 100083, People’s Republic of China
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States
| | - Qinfu Liu
- School of Geosciences and Surveying Engineering, China University of Mining &Technology (Beijing), Beijing 100083, People’s Republic of China
| | - Hongfei Cheng
- School of Geosciences and Surveying Engineering, China University of Mining &Technology (Beijing), Beijing 100083, People’s Republic of China
| | - Feng Gao
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States
| | - Cun Liu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China
| | - Brian J. Teppen
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States
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