Acid Free Oxidation and Simple Dispersion Method of MWCNT for High-Performance CFRP

Abstract

Carbon nanotubes (CNT) provide an outstanding property spectrum which can be used to improve a wide range of materials. However, the transfer of properties from the nanoscale to a macroscopic material is a limiting factor. Different approaches of functionalizing the surface of a CNT can improve the interaction with the surrounding matrix but is connected to difficult and expensive treatments, which are usually inconvenient for industrial applications. Here, a simple and eco-friendly method is presented for the oxidation of CNT, where hydrogen peroxide (H2O2) is the only chemical needed and no toxic emissions are released. Also, the extensive step of the incorporation of CNT to an epoxy matrix is simplified to an ultrasonic dispersion in the liquid hardener component. The effectiveness is proven by mechanical tests of produced CNT/CFRP and compared to a conventional processing route. The combination of those simple and cost efficient strategies can be utilized to produce multiscale composites with improved mechanical performance in an ecological and economical way.

The Structure and Chemical Composition of the Cr and Fe Pyrolytic Coatings on the MWCNTs’ Surface According to NEXAFS and XPS Spectroscopy

“…Figure 11a-c and Figure S6a-c (in Supplementary Materials) show the C1s, O1s, Cr2p, and Fe2p photoelectron spectra of MWCNTs, Cr/MWCNTs, and Fe/MWCNTs. An analysis of the initial MWCNTs spectra shows that the C1s spectrum agrees well with other studies' data [61][62][63][64][65] at the binding energy of the main peak (284.5 eV) corresponding to the C-C bond and at the wide plasmon band (291 eV), which confirms the high quality of MWCNTs under study. However, in the structure of the O1s spectra of MWCNTs (Figure 11b), two peaks with binding energies of 531.7 eV and 533.5 eV (correspond to the energies of C=O and C-OH bonds, respectively [61,66]) are found.…”

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

“…An oxidative treatment of MWCNTs was carried out by using H 2 O 2 as the oxidizing agent [53]. According to the method of Singer et al [53] with some modifications, a solution of H 2 O 2 18% (w/w) was used to dissolve 2.0 g of MWCNTs.…”

“…An oxidative treatment of MWCNTs was carried out by using H 2 O 2 as the oxidizing agent [53]. According to the method of Singer et al [53] with some modifications, a solution of H 2 O 2 18% (w/w) was used to dissolve 2.0 g of MWCNTs. Then, the suspension was heated at 80 • C for 4 h and, after, was thoroughly filtered and washed with ultrapure water until the washing water reached neutral pH.…”

Derivatized Carbon Nanotubes for Gene Therapy in Mammalian and Plant Cells

“…However, this method suffers from loss in the electronic properties of CNTs thereby making them ineffective for optical applications. [33] As of now, Zhang et al in 2015 [34] and Signer et al in 2018 [35] invented the green strategy for functionalization with À COOH groups by utilizing potassium ferrate and hydrogen peroxide (H 2 O 2 ) separately. Another example of green oxidation was reported by Wei et al where they used a mechanical grinding technique to shorten the length of nanotube followed by Piranha-type oxidation by using hydroxyl radicals.…”