Thermal and electrical properties of the epoxy nanocomposites reinforced with purified carbon nanotubes

Chen, Junjie; Han, Jiecheng; Xu, Deguang

doi:10.1016/j.matlet.2019.03.037

Cited by 33 publications

(12 citation statements)

References 15 publications

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“…We have also measured the thermal conductivity of the obtained materials (Figure 8). It is interesting to see that despite drastic changes of electrical conductivity depending on the time of grinding and the amount of EC, thermal conductivity remained generally unaffected in contrast with electrical conductivity (the results are in accordance with similar findings reported by Chen and co-workers [45]). Most samples demonstrate the values of thermal conductivity within the range from 84 W/mK to 113 W/mK.…”

Section: Resultssupporting

confidence: 91%

Simple Method to Improve Electrical Conductivity of Films Made from Single-Walled Carbon Nanotubes

et al. 2019

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Despite the widespread use of sonication for individualization of nanomaterials, its destructive nature is rarely acknowledged. In this study, we demonstrated how exposure of the material to a hostile sound wave environment can be limited by the application of another preprocessing step. Single-walled carbon nanotubes (CNTs) were initially ground in a household coffee grinder, which enabled facile deagglomeration thereof. Such a simple approach enabled us to obtain high-quality CNT dispersion at reduced sonication time. Most importantly, electrical conductivity of free-standing films prepared from these dispersion was improved almost fourfold as compared with unground material eventually reaching 1067 ± 34 S/cm. This work presents a new approach as to how electrical properties of nanocarbon ensembles may be enhanced without the application of doping agents, the presence of which is often ephemeral.

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Section: Resultssupporting

confidence: 91%

Simple Method to Improve Electrical Conductivity of Films Made from Single-Walled Carbon Nanotubes

et al. 2019

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“…Therefore, their addition into an insulating media promotes the creation of electrical networks. This fact induces an enhancement of the electrical conductivity of several orders of magnitude, becoming the polymer coating electrically conductive [26,27].…”

Section: Fundamentals Of Shm With Carbon Nanoparticlesmentioning

confidence: 99%

Smart Coatings with Carbon Nanoparticles

Sánchez–Romate¹,

Jiménez‐Suárez²,

Prolongo³

2020

21st Century Surface Science - A Handbook

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Smart coatings based on polymer matrix doped with carbon nanoparticles, such as carbon nanotubes or graphene, are being widely studied. The addition of carbon nanofillers into organic coatings usually enhances their performance, increasing their barrier properties, corrosion resistance, hardness, and wear strength. Moreover, the developed composites provide a new generation of protective organic coatings, being able to intelligently respond to damage or external stimuli. Carbon nanoparticles induce new functionalities to polymer coatings, most of them related to the higher electrical conductivity of nanocomposite due to the formation of percolation network. These coatings can be used as strain sensors and gauges, based on the variation of their electrical resistance (structural health monitoring, SHM). In addition, they act as self-heaters by the application of electrical voltage associated to resistive heating by Joule effect. This opens new potential applications, particularly deicing and defogging coatings. Superhydrophobic and self-cleaning coatings are inspired from lotus effect, designing micro-and nanoscaled hierarchical surfaces. Coatings with self-healable polymer matrix are able to repair surface damages. Other relevant smart capabilities of these new coatings are flame retardant, lubricating, stimuli-chromism, and antibacterial activity, among others.

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“…UV-cured epoxy-based polymeric film adheres very well to a variety of substrates. They strongly resist chemicals and abrasives and have excellent electrical insulation, high tensile, bending, and compressive strength, and they exhibit thermal stability (Chattopadhyay et al, 2005;Chen et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Optimizing the immobilization conditions of β‐galactosidase on UV‐cured epoxy‐based polymeric film using response surface methodology

et al. 2021

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UV-cured epoxy-based polymeric film was prepared from glycidyl methacrylate, trimethylolpropane triacrylate, and poly(ethylene glycol) methylether acrylate.2-hydroxy-2-methylpropiophenone was used as photo initiator. Covalent binding through epoxy groups was employed to immobilize β-galactosidase from Escherichia coli onto this film, and immobilization conditions were optimized by the response surface methodology. ATR-Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) analysis was carried out to characterize the epoxy-based polymeric film. Immobilization yield of β-galactosidase on the material was calculated as 3.57 mg/g and the highest enzyme activity for the immobilized enzyme recorded at pH 6.5°C and 60°C. The immobilized enzyme preserved 51% of its activity at the end of 12 runs. Free and immobilized enzyme hydrolyzed 163.8 and 172.3 µM lactose from 1% lactose, respectively. Kinetic parameters of both free and immobilized βgalactosidase were also investigated, and K m values were determined to be 0.647 and 0.7263 mM, respectively. Practical applicationsIn our study we prepared a UV-cured epoxy-based polymeric film and optimized the immobilization conditions of β-galactosidase from Escherichia coli onto this polymeric film by using response surface methodology (RSM). For this purpose, three-level and three-factor Box-Behnken design, which is an independent, rotatable or nearly rotatable, quadratic design, was applied. Optimal levels of three variables, namely, the amount of enzyme, immobilization time, and pH were determined using Box-Behnken experimental design. Lactose hydrolysis studies were performed from milk and lactose samples using free and immobilized enzyme. In addition, kinetic parameters, storage stability, and re-usability of immobilized β-galactosidase were examined.

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Thermal and electrical properties of the epoxy nanocomposites reinforced with purified carbon nanotubes

Cited by 33 publications

References 15 publications

Simple Method to Improve Electrical Conductivity of Films Made from Single-Walled Carbon Nanotubes

Simple Method to Improve Electrical Conductivity of Films Made from Single-Walled Carbon Nanotubes

Smart Coatings with Carbon Nanoparticles

Optimizing the immobilization conditions of β‐galactosidase on UV‐cured epoxy‐based polymeric film using response surface methodology

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