Finely Dispersed Single-Walled Carbon Nanotubes for Polysaccharide Hydrogels

Yan, Liang; Chen, Hailan; Kim, Dong Hwan; Chan‐Park, Mary B.

doi:10.1021/am300985p

Cited by 23 publications

(16 citation statements)

References 50 publications

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“…Some works on the electrical properties of pristine or composite hydrogels [22e24] describe their conduction mechanism as mainly dominated by ionic transport. While different methods could be used (electrical impedance, conductivity meters) [20,22,25e28], impedance spectroscopy is often the most widely used characterization method [20,22,29]. Analysis of the results is based on the assumption that most of the hydrogel is composed of water, and results seem to indicate that it behaves as a liquid trapped in the volume of the samples.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of double-wall carbon nanotubes nanocomposite hydrogels

Guillet

Valdez-Nava

Golzio

et al. 2019

Carbon

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The electrical behaviour of nanocomposite hydrogels and especially hydrogels containing carbon nanotubes is generally poorly understood. In this paper, we investigate the influence of double-wall carbon nanotubes (DWCNT) content on the electrical properties of agarose/DWCNT nanocomposite hydrogels. These nanocomposite hydrogels are potential candidates as electrode materials for transdermal drug delivery by electropermeabilization. Both alternating current (AC) and direct current (DC) measurements at different voltage amplitudes were performed, as well impedance spectroscopy (1 Hze1 MHz). Data suggest a non-linear dependence of the conduction phenomena vs the applied electric field. From the current-voltage characteristics, the nanocomposite conduction phenomenon is narrowed to two possible mechanisms, a Schottky type or a Poole-Frenkel type. These findings are the first step towards the understanding of the conduction phenomena in such complex nanocomposite structures, comprising DWCNT, water and the 3D polymeric network. The work described in this work is of much wider interest because this kind of nanocomposites may have many other applications, while the fundamental questions about their electrical conductivity remain universal.

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Section: Introductionmentioning

confidence: 99%

Electrical properties of double-wall carbon nanotubes nanocomposite hydrogels

Guillet

Valdez-Nava

Golzio

et al. 2019

Carbon

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“…More recently, great interest has been focused on developing novel Na‐alg with improved mechanical properties. As a successful example, nanocomposite Na‐alg with unique structures and high mechanical strength which are composed of Na‐alg and inorganic nanofillers, such as clays, carbon nanotubes, halloysite nanotubes, and graphene oxide (GO) have been put forward. Nowadays, GO has been no doubt the hottest topic due to its excellent optical, electrical, mechanical properties, and unique flat structure with atomic thickness .…”

Section: Introductionmentioning

confidence: 99%

The synthesis and characteristics of sodium alginate/graphene oxide composite films crosslinked with multivalent cations

Zheng

Yang

Han

2016

J of Applied Polymer Sci

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Association of a method of the incorporation of graphene oxide (GO) into sodium alginate (Na‐alg) polymer matrix with a method of the use multivalent cations crosslinker was put forward to synthesize novel Na‐alg/GO nanocomposite films. The structures, morphologies, and the properties of Na‐alg/GO films were characterized by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), field‐emission scanning electron microscopy (FE‐SEM), thermogravimetric analysis (TGA), and tensile tests. The results revealed that the interlayer distance of GO sheets increased from 0.83 nm to 1.08 nm after assembling with Na‐alg, and Na‐alg inserted into GO layers crosslinking with multivalent cations increased the interlayer distance further. Ionic crosslinking significantly enhanced thermal and mechanical properties of Na‐alg/GO nanocomposite films. In particular, Fe3+ led to Na‐alg/GO nanocomposite films of significantly higher tensile strength and modulus than Ca2+ and Ba2+. The excellent thermal and mechanical properties of these novel Na‐alg/GO nanocomposite films may open up applications for Na‐alg films. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43616.

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“…31,32 Non-covalent polymer/CNT gels have been prepared by ionic crosslinking of alginate. 33 Bottom up approaches using free-radical polymerisation of monomers such as N-isopropylacrylamide have also been used to construct these composites. 34 However, gel composites prepared from MGs and CNTs have not been reported.…”

Section: Introductionmentioning

confidence: 99%

A study of conductive hydrogel composites of pH-responsive microgels and carbon nanotubes

et al. 2016

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Conductive gel composites are attracting considerable attention because of their interesting electrical and mechanical properties. Here, we report conductive gel composites constructed using only colloidal particles as building blocks. The composites were prepared from mixed dispersions of vinyl-functionalised pH-responsive microgel particles (MGs) and multi-walled carbon nanotubes (CNTs). MGs are crosslinked pH-responsive polymer colloid particles that swell when the pH approaches the pKa of the particles. Two MG systems were used which contained ethyl acrylate (EA) or methyl acrylate (MA) and around 30 mol% of methacrylic acid (MAA). The MA-based MG is a new pH-responsive system. The mixed MG/CNT dispersions formed thixotropic physical gels. Those gels were transformed into covalent interlinked electrically conducting doubly crosslinked microgel/CNT composites (DX MG/CNT) by free-radical reaction. The MGs provided the dual roles of dispersant for the CNTs and macro-crosslinker for the composite. TEM data showed evidence for strong attraction between the MG and the CNTs which facilitated CNT dispersion. An SEM study confirmed CNT dispersion throughout the composites. The mechanical properties of the composites were studied using dynamic rheology and uniaxial compression measurements. Surprisingly, both the ductility and the modulus of the gel composites increased with increasing CNT concentration used for their preparation. Human adipose-derived mesenchymal stem cells (AD-MSCs) exposed to DX MG/CNT maintained over 99% viability with metabolic activity retained over 7 days, which indicated non-cytotoxicity. The results of this study suggest that our approach could be used to prepare other DX MG/CNT gel composites and that these materials may lead to future injectable gels for advanced soft-tissue repair.

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Finely Dispersed Single-Walled Carbon Nanotubes for Polysaccharide Hydrogels

Cited by 23 publications

References 50 publications

Electrical properties of double-wall carbon nanotubes nanocomposite hydrogels

Electrical properties of double-wall carbon nanotubes nanocomposite hydrogels

The synthesis and characteristics of sodium alginate/graphene oxide composite films crosslinked with multivalent cations

A study of conductive hydrogel composites of pH-responsive microgels and carbon nanotubes

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