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Galyaltdinov S, Lounev I, Khamidullin T, Hashemi SA, Nasibulin A, Dimiev AM. High Permittivity Polymer Composites on the Basis of Long Single-Walled Carbon Nanotubes: The Role of the Nanotube Length. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3538. [PMID: 36234671 PMCID: PMC9565907 DOI: 10.3390/nano12193538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/03/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
Controlling the permittivity of dielectric composites is critical for numerous applications dealing with matter/electromagnetic radiation interaction. In this study, we have prepared polymer composites, based on a silicone elastomer matrix and Tuball carbon nanotubes (CNT) via a simple preparation procedure. The as-prepared composites demonstrated record-high dielectric permittivity both in the low-frequency range (102−107 Hz) and in the X-band (8.2−12.4 GHz), significantly exceeding the literature data for such types of composite materials at similar CNT content. Thus, with the 2 wt% filler loading, the permittivity values reach 360 at 106 Hz and >26 in the entire X-band. In similar literature, even the use of conductive polymer hosts and various highly conductive additives had not resulted in such high permittivity values. We attribute this phenomenon to specific structural features of the used Tuball nanotubes, namely their length and ability to form in the polymer matrix percolating network in the form of neuron-shaped clusters. The low cost and large production volumes of Tuball nanotubes, as well as the ease of the composite preparation procedure open the doors for production of cost-efficient, low weight and flexible composites with superior high permittivity.
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Affiliation(s)
- Shamil Galyaltdinov
- Laboratory for Advanced Carbon Nanomaterials, Chemical Institute, Kazan Federal University, 18 Kremlyovskaya Street, 420008 Kazan, Russia
| | - Ivan Lounev
- Laboratory for Advanced Carbon Nanomaterials, Chemical Institute, Kazan Federal University, 18 Kremlyovskaya Street, 420008 Kazan, Russia
- Institute of Physics, Kazan Federal University, 18 Kremlyovskaya Street, 420008 Kazan, Russia
| | - Timur Khamidullin
- Laboratory for Advanced Carbon Nanomaterials, Chemical Institute, Kazan Federal University, 18 Kremlyovskaya Street, 420008 Kazan, Russia
| | - Seyyed Alireza Hashemi
- Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC V1V 1V7, Canada
| | - Albert Nasibulin
- Skolkovo Institute of Science and Technology, Nobel Str. 3, 143026 Moscow, Russia
| | - Ayrat M. Dimiev
- Laboratory for Advanced Carbon Nanomaterials, Chemical Institute, Kazan Federal University, 18 Kremlyovskaya Street, 420008 Kazan, Russia
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Liang S, Qin Y, Gao W, Wang M. A lightweight polyurethane-carbon microsphere composite foam for electromagnetic shielding. E-POLYMERS 2022. [DOI: 10.1515/epoly-2022-0023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this study, we have produced a lightweight foam composite material by a simple freeze-drying method, which is composed of carboxylated multi-walled carbon nanotubes (MWCNTs), mesoporous carbon hollow microspheres (MCHMs), water-based polyurethane (WPU), and polyvinyl alcohol (PVA). MCHMs were prepared by a novel and facile method. We found that the electromagnetic shielding performance of foam composites can be adjusted by adjusting the density of foam composites, and the electromagnetic shielding performance of composites can be enhanced through the synergistic effect of hollow mesoporous carbon and MWCNTs. The composite material with a density of 232.8042 mg·cm−3 and 40 wt% MWCNT has a δ of 30.2 S·m−1 and SE of 23 dB. After adding 10 wt% MCHMs to the composite material, δ reaches 33.2 S·m−1, and SE reaches 28 dB. Both absorption losses accounted for 70%. The increase in the content of MWCNT, the increase in density, and the introduction of MCHMs all have a positive effect on the δ and SE of the composite material.
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Affiliation(s)
- Shaofeng Liang
- School of Resources, Environment and Materials, Guangxi University , Nanning 530000 , Guangxi , China
| | - Yuxuan Qin
- School of Resources, Environment and Materials, Guangxi University , Nanning 530000 , Guangxi , China
| | - Wei Gao
- School of Resources, Environment and Materials, Guangxi University , Nanning 530000 , Guangxi , China
- Guangxi Engineering and Technology Research Center for High Quality Structural Panels from Biomass Wastes , Nanning 530000 , Guangxi , China
| | - Muqun Wang
- School of Resources, Environment and Materials, Guangxi University , Nanning 530000 , Guangxi , China
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Bartoli M, Torsello D, Piatti E, Giorcelli M, Sparavigna AC, Rovere M, Ghigo G, Tagliaferro A. Pressure-Responsive Conductive Poly(vinyl alcohol) Composites Containing Waste Cotton Fibers Biochar. MICROMACHINES 2022; 13:mi13010125. [PMID: 35056291 PMCID: PMC8781896 DOI: 10.3390/mi13010125] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/07/2022] [Accepted: 01/11/2022] [Indexed: 01/27/2023]
Abstract
The development of responsive composite materials is among the most interesting challenges in contemporary material science and technology. Nevertheless, the use of highly expensive nanostructured fillers has slowed down the spread of these smart materials in several key productive sectors. Here, we propose a new piezoresistive PVA composite containing a cheap, conductive, waste-derived, cotton biochar. We evaluated the electromagnetic properties of the composites under both AC and DC regimes and as a function of applied pressure, showing promisingly high conductivity values by using over 20 wt.% filler loading. We also measured the conductivity of the waste cotton biochar from 20 K up to 350 K observing, for the first time, hopping charge transport in biochar materials.
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Affiliation(s)
- Mattia Bartoli
- Center for Sustainable Future Technologies—CSFT@POLITO, Via Livorno 60, 10144 Torino, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via G. Giusti 9, 50121 Florence, Italy; (M.G.); (M.R.)
- Correspondence: (M.B.); (A.T.); Tel.: +39-0110904326 (M.B.); +39-0110907347 (A.T.)
| | - Daniele Torsello
- Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy; (D.T.); (E.P.); (A.C.S.); (G.G.)
- Istituto Nazionale di Fisica Nucleare, Sez. Torino, Via P. Giuria 1, 10125 Turin, Italy
| | - Erik Piatti
- Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy; (D.T.); (E.P.); (A.C.S.); (G.G.)
| | - Mauro Giorcelli
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via G. Giusti 9, 50121 Florence, Italy; (M.G.); (M.R.)
- Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy; (D.T.); (E.P.); (A.C.S.); (G.G.)
| | - Amelia Carolina Sparavigna
- Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy; (D.T.); (E.P.); (A.C.S.); (G.G.)
| | - Massimo Rovere
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via G. Giusti 9, 50121 Florence, Italy; (M.G.); (M.R.)
- Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy; (D.T.); (E.P.); (A.C.S.); (G.G.)
| | - Gianluca Ghigo
- Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy; (D.T.); (E.P.); (A.C.S.); (G.G.)
- Istituto Nazionale di Fisica Nucleare, Sez. Torino, Via P. Giuria 1, 10125 Turin, Italy
| | - Alberto Tagliaferro
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via G. Giusti 9, 50121 Florence, Italy; (M.G.); (M.R.)
- Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy; (D.T.); (E.P.); (A.C.S.); (G.G.)
- Faculty of Science, University of Ontario Institute of Technology, Oshawa, ON L1G 0C5, Canada
- Correspondence: (M.B.); (A.T.); Tel.: +39-0110904326 (M.B.); +39-0110907347 (A.T.)
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Shin YE, Cho JY, Yeom J, Ko H, Han JT. Electronic Textiles Based on Highly Conducting Poly(vinyl alcohol)/Carbon Nanotube/Silver Nanobelt Hybrid Fibers. ACS APPLIED MATERIALS & INTERFACES 2021; 13:31051-31058. [PMID: 34156236 DOI: 10.1021/acsami.1c08175] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Highly stable conducting fibers have attracted significant attention in electronic textile (e-textile) applications. Here, we fabricate highly conducting poly(vinyl alcohol) (PVA) nanocomposite fibers with high thermal and chemical stability based on silver nanobelt (AgNB)/multiwalled carbon nanotube (MWCNT) hybrid materials as conducting fillers. At 20 vol % AgNB/MWCNT, the electrical conductivity of the fiber dramatically increased (∼533 times) from 3 up to 1600 S/cm after thermal treatment at 300 °C for 5 min. Moreover, PVA/AgNB/MWCNT fiber resists the harsh conditions of good solvents for PVA as well as high temperatures over the melting point of PVA, whereas pure PVA fiber is unstable in these environments. The significantly enhanced electrical conductivity and chemical stability can be realized through the post-thermal curing process, which is attributed to the coalescence between adjacent AgNBs and additional intensive cross-linking of PVA. These remarkable characteristics make our conducting fibers suitable for applications in e-textiles such as water leakage detectors and wearable heaters. In particular, heating behavior of e-textiles by Joule heating can accelerate the desorption of physically trapped moisture from the fiber surface, resulting in the fully reversible operation of water leakage monitoring. This smart e-textile sensor based on highly stable and conductive composite fibers will pave the way for diverse e-textile applications.
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Affiliation(s)
- Young-Eun Shin
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, Republic of Korea
| | - Joon Young Cho
- Department of Electro-Functionality Materials Engineering, University of Science and Technology (UST), Changwon 51543, Republic of Korea
| | - Jeonghee Yeom
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, Republic of Korea
| | - Hyunhyub Ko
- School of Energy and Chemical Engineering, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, Republic of Korea
| | - Joong Tark Han
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Republic of Korea
- Department of Electro-Functionality Materials Engineering, University of Science and Technology (UST), Changwon 51543, Republic of Korea
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Kumaran R, Kumar AV, Ramaprabhu S, Subramanian V. Absorption-enhanced EMI shielding using silver decorated three-dimensional porous architected reduced graphene oxide in polybenzoxazine composites. NEW J CHEM 2021. [DOI: 10.1039/d1nj03536c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The proliferation of wearable and portable electronic media has increased the demand for highly efficient materials that can be used to create shields against electromagnetic interference.
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Affiliation(s)
- R. Kumaran
- Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu-600036, India
| | - A. Vinaya Kumar
- Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu-600036, India
| | - S. Ramaprabhu
- Alternative Energy and Nanotechnology Laboratory (AENL), Department of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu-600036, India
| | - V. Subramanian
- Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu-600036, India
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