Electrical properties of double-wall carbon nanotubes nanocomposite hydrogels

Guillet, Jean-François; Valdez-Nava, Zarel; Golzio, Muriel; Flahaut, Emmanuel

doi:10.1016/j.carbon.2019.01.090

Cited by 37 publications

(25 citation statements)

References 35 publications

(31 reference statements)

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“…The activated electrons absorb energy and jump across the barrier of the thin polymer layer to the adjacent conductive filler, thereby forming a tunneling current and conducting path. This is the electron tunneling effect conductive mechanism [134].…”

Section: Self-healing Hydrogel With Conductive Fillersmentioning

confidence: 99%

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Zhang

Wang

Wei

et al. 2021

Gels

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Sensors are devices that can capture changes in environmental parameters and convert them into electrical signals to output, which are widely used in all aspects of life. Flexible sensors, sensors made of flexible materials, not only overcome the limitations of the environment on detection devices but also expand the application of sensors in human health and biomedicine. Conductivity and flexibility are the most important parameters for flexible sensors, and hydrogels are currently considered to be an ideal matrix material due to their excellent flexibility and biocompatibility. In particular, compared with flexible sensors based on elastomers with a high modulus, the hydrogel sensor has better stretchability and can be tightly attached to the surface of objects. However, for hydrogel sensors, a poor mechanical lifetime is always an issue. To address this challenge, a self-healing hydrogel has been proposed. Currently, a large number of studies on the self-healing property have been performed, and numerous exciting results have been obtained, but there are few detailed reviews focusing on the self-healing mechanism and conductivity of hydrogel flexible sensors. This paper presents an overview of self-healing hydrogel flexible sensors, focusing on their self-healing mechanism and conductivity. Moreover, the advantages and disadvantages of different types of sensors have been summarized and discussed. Finally, the key issues and challenges for self-healing flexible sensors are also identified and discussed along with recommendations for the future.

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Section: Self-healing Hydrogel With Conductive Fillersmentioning

confidence: 99%

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Zhang

Wang

Wei

et al. 2021

Gels

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“…The utilization of such platforms with unipolar pulses allowed us to obtain promising preliminary ex vivo results in a previous work [25]. The electrical characterization of the nanocomposite was also presented elsewhere [26].…”

Section: Introductionmentioning

confidence: 95%

“…The nanocomposite synthesis was already reported elsewhere [25,26]. Briefly, a solution of agarose at 25 g/L was mixed at 90 • C with a suspension at 0.25 g/L in water of doubled-walled CNT synthesized in our lab [27].…”

Section: Platform Preparationmentioning

confidence: 99%

Transdermal Delivery of Macromolecules Using Two-in-One Nanocomposite Device for Skin Electroporation

et al. 2021

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Delivery of hydrophilic molecules through the skin using electroporation is a promising alternative approach to intradermal injection. Recently, we developed a two-in-one electrode/reservoir material composed of carbon nanotubes and agarose hydrogel. In this work, we evaluated the potential of the device to achieve non-invasive transdermal drug delivery using skin electroporation. As it involved an electrode configuration different from the literature, critical questions were raised. First, we demonstrated the efficiency of the device to permeabilize the skin of hairless mice, as observed by propidium iodide (PI) uptake in the nuclei of the epidermis cells through macro fluorescence imaging and histology. Application of Lucifer yellow (LY) at different times after unipolar electroporation treatment demonstrated the partial reversibility of the skin permeabilization after 30 min, and as such, that barrier function properties tended to be restored. We uncovered, for the first time to our knowledge, an intrinsic asymmetry of permeation pathways generated in the stratum corneum during treatment. Electrophoresis was here the main driving force for macromolecule delivery, but it competed with passive diffusion through the generated aqueous pathways for smaller molecules. Finally, we validated 4 kDa dextran labelled with fluorescein isothiocyanate (FD4) as a model molecule to optimize the electrical parameters, needed to improve macromolecule delivery.

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“…The use of inorganic nanomaterials as llers in a polymer matrix still show a growing interest due to their wide range of properties and potential industrial applications. Up to now, the majority of research focused on polymer nanocomposites reinforced with organized carbon materials such as carbon nanotubes (CNT), graphite and buckyballs [8][9][10]. These nano llers have been promising materials because of their speci c properties such as low density, small dimensions, high aspect ratio, as well as outstanding thermal and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional poly(vinylidene fluoride) and styrene butadiene rubber blend magneto-responsive nanocomposites based on hybrid graphene oxide and Fe3O4: synthesis, preparation and characterization

et al. 2021

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Functional nanocomposites based on a blend of styrene butadiene rubber (SBR) and polyvinylidene di uoride (PVDF) as the matrix reinforced by a hybrid nano ller system of graphene oxide nanosheets (GOn) and ferromagnetic nanoparticles (Fe 3 O 4 ) at different weight ratios (3.75:1.25; 2.5:2.5 and 1.25:3.75) were successfully prepared and characterized to determine the effect of nano llers hybridization in improving the structural,mechanical, dielectric/electrical, magnetic and thermal properties of a polymer blend (PVDF-SBR) for electromagnetic interference (EMI) shielding applications. Due to the synergy between both nano llers, it was found that the Young's modulus of the nanocomposite containing 5 wt.% of the hybrid nano ller was signi cantly improved (87%), while the strain at yield remained constant due to the low particle content and the rubbery effect of the SBR copolymer. In addition, the degradation temperature of the matrix was shifted from 464°C to 472 °C with the addition of 2.5:2.5 of GOn:Fe 3 O 4 . Finally, the hybrid reinforcement also had a positive effect on the electrical and magnetic properties of the nanocomposites with an improvement that exceeds 30%. By careful selection of synthetic techniques and understanding/exploiting the unique physics of the polymeric nanocomposites in such materials, novel functional polymer-inorganic nanocomposites can be designed and fabricated for new interesting in magneto applications such as superparamagnetism, electromagnetic wave absorption, and electromagnetic interference shielding.

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Electrical properties of double-wall carbon nanotubes nanocomposite hydrogels

Cited by 37 publications

References 35 publications

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Self-Healing Mechanism and Conductivity of the Hydrogel Flexible Sensors: A Review

Transdermal Delivery of Macromolecules Using Two-in-One Nanocomposite Device for Skin Electroporation

Multifunctional poly(vinylidene fluoride) and styrene butadiene rubber blend magneto-responsive nanocomposites based on hybrid graphene oxide and Fe3O4: synthesis, preparation and characterization

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