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Song JP, Choi SH, Chung DW, Lee SJ. Latex-Based Polystyrene Nanocomposites with Non-Covalently Modified Carbon Nanotubes. Polymers (Basel) 2021; 13:polym13071168. [PMID: 33916505 PMCID: PMC8038690 DOI: 10.3390/polym13071168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 04/03/2021] [Accepted: 04/04/2021] [Indexed: 11/16/2022] Open
Abstract
We prepared electrically conductive polystyrene (PS) nanocomposites by incorporating non-covalently surface-modified carbon nanotubes (CNTs) with hydrophilic polymers such as polydopamine (PDA) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Further, ethylene glycol (EG) was introduced as a second dopant to improve the electrical properties of the nanocomposites prepared with PEDOT:PSS-wrapped CNTs. All conductive PS nanocomposites were prepared through latex-based process, and the morphology and properties of the nanocomposites were investigated. The electrical properties of the nanocomposites with PEDOT:PSS-wrapped CNTs were better than those of the nanocomposites with PDA-coated CNTs owing to the conducting nature of PEDOT:PSS, although the dispersions of both types of modified CNTs in the PS matrix were excellent, as evidenced by morphology and rheology. In the case of PEDOT:PSS modification, the electrical properties of the nanocomposites with EG-doped PEDOT:PSS-wrapped CNTs were superior to those of the nanocomposites without EG treatment.
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2
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Measurement of Flexural Rigidity of Multi-Walled Carbon Nanotubes by Dynamic Scanning Electron Microscopy. FIBERS 2020. [DOI: 10.3390/fib8050031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In this work the flexural rigidity of individual large diameter multi-walled carbon nanotubes (MWCNTs) was investigated. The bending modulus were obtained by detecting the resonance frequencies of mechanically excited cantilevered carbon nanotubes using the so-called dynamic scanning electron microscopy technique, and applying the Euler–Bernoulli beam theory. For the nanotubes studied, we determined a modulus of up to 160 GPa. This agrees with values reported by other authors for MWCNTs produced by catalytic chemical vapor deposition, however, it is 6-8 times smaller than values reported for single and multi-walled carbon nanotubes produced by arc-discharge synthesis. Toxicological studies with carbon nanotubes have been showing that inhaled airborne nanofibers that reach the deep airways of the respiratory system may lead to serious, asbestos-like lung diseases. These studies suggested that their toxicity critically depends on the fiber flexural rigidity, with high rigidity causing cell lesions. To complement the correlation between observed toxicological effects and fiber rigidities, reliable and routinely applicable measurement techniques for the flexural rigidity of nanofibers are required.
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Xu X, Hsieh YL. Aqueous exfoliated graphene by amphiphilic nanocellulose and its application in moisture-responsive foldable actuators. NANOSCALE 2019; 11:11719-11729. [PMID: 31180404 DOI: 10.1039/c9nr01602c] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Graphene is a promising material for diverse applications, such as in composites, optoelectronics, photovoltaic cells, and energy storage devices. However, high-yielding liquid exfoliation of good-quality graphene in high concentrations remains a challenge. In this study, amphiphilic 2,2,6,6-tetramethylpiperidin-1-yl-oxyl (TEMPO)-mediated cellulose nanofibrils (CNFs) were demonstrated in robust aqueous exfoliation of graphite into high quality graphene in high yields and stable dispersions with graphene concentration up to 1 mg mL-1. Over 50% of graphene flakes exfoliated were 3 layers or less, of which ca. 5% were monolayer, and another 47% were multilayers, leaving only 3% as un-exfoliated graphitic platelets. Outstanding yields up to 84.2% were achieved at an optimized 0.2 g g-1 graphite : CNF feed ratio. The dispersed graphitic flakes are stabilized by Coulomb repulsion from the surface bound charged CNFs. Aqueous graphene suspensions stabilized by CNFs were easily vacuum filtered into nanopapers that exhibited rapid moisture triggered motion and spontaneous recovery in the absence of moisture, resembling actions of biological motor cells in "shame plant" leaves. Such unique moisture responsive behavior is attributed to the highly accessible, charged CNF surfaces and the recovery is due to the inherently hydrophobic graphene. This facile aqueous exfoliating approach using amphiphilic CNFs as multi-functional exfoliating, dispersing and structural-forming agents for moisture-responsive graphene nanopaper opens up a large-area of potential applications toward biologically inspired sensors and actuators.
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Affiliation(s)
- Xuezhu Xu
- Fiber and Polymer Science, University of California, Davis, California 95616, USA.
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Qiu F, He G, Hao M, Zhang G. Enhancing the Mechanical and Electrical Properties of Poly(Vinyl Chloride)-Based Conductive Nanocomposites by Zinc Oxide Nanorods. MATERIALS 2018; 11:ma11112139. [PMID: 30380755 PMCID: PMC6265969 DOI: 10.3390/ma11112139] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/12/2018] [Accepted: 10/24/2018] [Indexed: 01/16/2023]
Abstract
A simple approach to decorate multi-walled carbon nanotube (MWCNT)–reduced graphene oxide (RGO) hybrid nanoparticles with zinc oxide (ZnO) nanorods is developed to improve the electrical and mechanical properties of poly(vinyl chloride) (PVC)/MWCNT–RGO composites. The ZnO nanorods act as “joint” in three-dimensional (3D) MWCNT–RGO networks and the hybrid particles strongly interact with PVC chains via p-π stacking, hydrogen bonds, and electrostatic interactions, which we confirmed by scanning electron microscopy (SEM) and Raman analysis. By introducing the ZnO nanorods, the RGO–ZnO–MWCNT hybrid particles increased 160% in capacitance compared with MWCNT–RGO hybrids. Moreover, the addition of RGO–ZnO–MWCNT to PVC resulted in the mechanical properties of PVC being enhanced by 30.8% for tensile strength and 60.9% for Young’s modulus at the loadings of 2.0 weight percent (wt.%) and 1.0 wt.%, respectively. Meanwhile, the electrical conductivity of PVC increased by 11 orders of magnitude, from 1 × 10−15 S/m to 1 × 10−4 S/m for MWCNT–ZnO–RGO loading at 5.0 wt.%.
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Affiliation(s)
- Feng Qiu
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Guangjian He
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Mingyang Hao
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Guizhen Zhang
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
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Oh JH, Hong SY, Park H, Jin SW, Jeong YR, Oh SY, Yun J, Lee H, Kim JW, Ha JS. Fabrication of High-Sensitivity Skin-Attachable Temperature Sensors with Bioinspired Microstructured Adhesive. ACS APPLIED MATERIALS & INTERFACES 2018; 10:7263-7270. [PMID: 29400434 DOI: 10.1021/acsami.7b17727] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In this study, we demonstrate the fabrication of a highly sensitive flexible temperature sensor with a bioinspired octopus-mimicking adhesive. A resistor-type temperature sensor consisting of a composite of poly(N-isopropylacrylamide) (pNIPAM)-temperature sensitive hydrogel, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, and carbon nanotubes exhibits a very high thermal sensitivity of 2.6%·°C-1 between 25 and 40 °C so that the change in skin temperature of 0.5 °C can be accurately detected. At the same time, the polydimethylsiloxane adhesive layer of octopus-mimicking rim structure coated with pNIPAM is fabricated through the formation of a single mold by utilizing undercut phenomenon in photolithography. The fabricated sensor shows stable and reproducible detection of skin temperature under repeated attachment/detachment cycles onto skin without any skin irritation for a long time. This work suggests a high potential application of our skin-attachable temperature sensor to wearable devices for medical and health-care monitoring.
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Affiliation(s)
- Ju Hyun Oh
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Soo Yeong Hong
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Heun Park
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Sang Woo Jin
- KU-KIST Graduate School of Converging Science and Technology , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Yu Ra Jeong
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Seung Yun Oh
- KU-KIST Graduate School of Converging Science and Technology , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Junyeong Yun
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Hanchan Lee
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Jung Wook Kim
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
| | - Jeong Sook Ha
- Department of Chemical and Biological Engineering, Korea University , 5-1 Anam-dong, Seoul 13l-701, Korea
- KU-KIST Graduate School of Converging Science and Technology , 5-1 Anam-dong, Seoul 13l-701, Korea
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6
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Jain B, Krishnamoorthy K. Enhancement in charge storage upon conversion of conjugated polymer spheres to fibers. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.06.156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tiwari SK, Verma K, Saren P, Oraon R, De Adhikari A, Nayak GC, Kumar V. Manipulating selective dispersion of reduced graphene oxide in polycarbonate/nylon 66 based blend nanocomposites for improved thermo-mechanical properties. RSC Adv 2017. [DOI: 10.1039/c7ra02044a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Selective dispersion of rGO in PC/nylon blend by varying mixing sequence of rGO during melt mixing.
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Affiliation(s)
- Santosh Kr. Tiwari
- Department of Applied Chemistry
- Indian Institute of Technology (ISM)
- Dhanbad
- India
| | - Kartikey Verma
- Department of Applied Physics
- Chandigarh University
- Mohali
- India
| | - Pupulata Saren
- Department of Applied Chemistry
- Indian Institute of Technology (ISM)
- Dhanbad
- India
| | - Ramesh Oraon
- Department of Applied Chemistry
- Indian Institute of Technology (ISM)
- Dhanbad
- India
| | - Amrita De Adhikari
- Department of Applied Chemistry
- Indian Institute of Technology (ISM)
- Dhanbad
- India
| | | | - Vijay Kumar
- Department of Applied Physics
- Chandigarh University
- Mohali
- India
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Kim K, Ahn K, Ju H, Kim J. Improvement of Insulating and Thermal Properties of SiO2-Coated Copper Nanowire Composites. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.5b04141] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kiho Kim
- School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 156-756, Korea
| | - Kisang Ahn
- School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 156-756, Korea
| | - Hyun Ju
- School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 156-756, Korea
| | - Jooheon Kim
- School of Chemical Engineering & Materials Science, Chung-Ang University, Seoul 156-756, Korea
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Ventura IA, Zhou J, Lubineau G. Investigating the Inter-Tube Conduction Mechanism in Polycarbonate Nanocomposites Prepared with Conductive Polymer-Coated Carbon Nanotubes. NANOSCALE RESEARCH LETTERS 2015; 10:485. [PMID: 26676996 PMCID: PMC4681711 DOI: 10.1186/s11671-015-1191-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 12/07/2015] [Indexed: 05/21/2023]
Abstract
A well-known strategy to improve the electrical conductivity of polymers is to dope them with high-aspect-ratio and conductive nanoparticles such as carbon nanotubes (CNTs). However, these nanocomposites also exhibit undesirable properties such as damage-sensitive and history-dependent conductivity because their macroscopic electrical conductivity is largely determined by the tunneling effect at the tube/tube interface. To reduce these issues, new nanocomposites have been developed with CNTs that have been coated with a conductive layer of poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOT/PSS). It has been posited that the insulating region between the CNTs is replaced by a conductive polymer bridge; this has not been proven up to now. We propose here to investigate in-depth how the macroscopic conductivity of these materials is changing when (1) varying the frequency of the electrical loading (impedance spectroscopy), (2) varying the mechanical hydrostatic pressure, and (3) varying the voltage of the electrical loading. The response is systematically compared to the one of conventional carbon nanotube/polycarbonate (CNT/PC) nanocomposites so we can clarify how efficiently the tunneling effect is suppressed from these composites. The objective is to elucidate further the mechanism for conduction in such material formulations.
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Affiliation(s)
- Isaac Aguilar Ventura
- Physical Sciences and Engineering Division, COHMAS Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Jian Zhou
- Physical Sciences and Engineering Division, COHMAS Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Gilles Lubineau
- Physical Sciences and Engineering Division, COHMAS Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
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10
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Wang K, Tang RY, Zhao XB, Li JJ, Lang YR, Jiang XX, Sun HJ, Lin QX, Wang CY. Covalent bonding of YIGSR and RGD to PEDOT/PSS/MWCNT-COOH composite material to improve the neural interface. NANOSCALE 2015; 7:18677-18685. [PMID: 26499788 DOI: 10.1039/c5nr05784a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The development of coating materials for neural interfaces has been a pursued to improve the electrical, mechanical and biological performances. For these goals, a bioactive coating was developed in this work featuring a poly(3,4-ethylenedioxythiophene) (PEDOT)/carbon nanotube (CNT) composite and covalently bonded YIGSR and RGD. Its biological effect and electrical characteristics were assessed in vivo on microwire arrays (MWA). The coated electrodes exhibited a significantly higher charge storage capacity (CSC) and lower electrochemical impedance at 1 kHz which are desired to improve the stimulating and recording performances, respectively. Acute neural recording experiments revealed that coated MWA possess a higher signal/noise ratio capturing spikes undetected by uncoated electrodes. Moreover, coated MWA possessed more active sites and single units, and the noise floor of coated electrodes was lower than that of uncoated electrodes. There is little information in the literature concerning the chronic performance of bioactively modified neural interfaces in vivo. Therefore in this work, chronic in vivo tests were conducted and the PEDOT/PSS/MWCNT-polypeptide coated arrays exhibited excellent performances with the highest mean maximal amplitude from day 4 to day 12 during which the acute response severely compromised the performance of the electrodes. In brief, we developed a simple method of covalently bonding YIGSR and RGD to a PEDOT/PSS/MWCNT-COOH composite improving both the biocompatibility and electrical performance of the neural interface. Our findings suggest that YIGSR and RGD modified PEDOT/PSS/MWCNT is a promising bioactivated composite coating for neural recording and stimulating.
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Affiliation(s)
- Kun Wang
- Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, No. 27, Taiping Road, Beijing, 100850, China.
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11
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Zhou J, Anjum DH, Lubineau G, Li EQ, Thoroddsen ST. Unraveling the Order and Disorder in Poly(3,4-ethylenedioxythiophene)/Poly(styrenesulfonate) Nanofilms. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00851] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jian Zhou
- Physical Sciences and Engineering Division,
COHMAS Laboratory, ‡Imaging and Characterization
Lab, and §Physical Sciences and Engineering Division, High-Speed Fluids Imaging
Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Dalaver H. Anjum
- Physical Sciences and Engineering Division,
COHMAS Laboratory, ‡Imaging and Characterization
Lab, and §Physical Sciences and Engineering Division, High-Speed Fluids Imaging
Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Gilles Lubineau
- Physical Sciences and Engineering Division,
COHMAS Laboratory, ‡Imaging and Characterization
Lab, and §Physical Sciences and Engineering Division, High-Speed Fluids Imaging
Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Er Qiang Li
- Physical Sciences and Engineering Division,
COHMAS Laboratory, ‡Imaging and Characterization
Lab, and §Physical Sciences and Engineering Division, High-Speed Fluids Imaging
Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Sigurdur T. Thoroddsen
- Physical Sciences and Engineering Division,
COHMAS Laboratory, ‡Imaging and Characterization
Lab, and §Physical Sciences and Engineering Division, High-Speed Fluids Imaging
Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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12
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Patole A, Ventura IA, Lubineau G. Thermal conductivity and stability of a three-phase blend of carbon nanotubes, conductive polymer, and silver nanoparticles incorporated into polycarbonate nanocomposites. J Appl Polym Sci 2015. [DOI: 10.1002/app.42281] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Archana Patole
- King Abdullah University of Science and Technology (KAUST); Physical Science and Engineering Division, COHMAS Laboratory; Thuwal Saudi Arabia
| | - Isaac Aguilar Ventura
- King Abdullah University of Science and Technology (KAUST); Physical Science and Engineering Division, COHMAS Laboratory; Thuwal Saudi Arabia
| | - Gilles Lubineau
- King Abdullah University of Science and Technology (KAUST); Physical Science and Engineering Division, COHMAS Laboratory; Thuwal Saudi Arabia
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