Clay Improved Dispersion of Carbon Nanotubes in Different Solvents

Ivanoska-Dacikj, Aleksandra; Bogoeva‐Gaceva, Gordana; Bužarovska, Aleksandra

doi:10.20903/csnmbs.masa.2015.36.1.60

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…The bands from PEO are diminished in the Raman spectra of the samples containing the highest rGO concentrations, 10 and 20 wt%, because rGO at such high concentrations cannot be totally exfoliated, and the excess remains non-incorporated in the polymer matrix, thus resembling the spectral behavior of its initial, native compound. These considerations are agreeably explained by the manifestation of the D and G bands characteristic for the graphitic structure (G band at 1597 cm −1 , emerging from the C-C vibrations of delocalized p-electrons with sp 2 hybridization, and D band at 1335 cm −1 , distinctive for the defects in the graphitic structures with sp 3 hybridization [54,62]) that start to appear for the samples that contain 1 and 5 wt% rGO, alongside the bands characteristic for PEO. For higher rGO concentrations (10 and 20 wt%), as mentioned above, the spectral dominance features the rGO characteristic bands, D and G, completely suppressing the PEO bands (Figure 6, left panel).…”

Section: Resultssupporting

confidence: 66%

Electrospun PEO/rGO Scaffolds: The Influence of the Concentration of rGO on Overall Properties and Cytotoxicity

Ivanoska-Dacikj

Makreski

Geškovski

et al. 2022

IJMS

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Reduced graphene oxide (rGO) is one of the graphene derivatives that can be employed to engineer bioactive and/or electroactive scaffolds. However, the influence of its low and especially high concentrations on scaffolds’ overall properties and cytotoxicity has yet to be explored. In this study, polyethylene oxide (PEO)-based scaffolds containing from 0.1 to 20 wt% rGO were obtained by electrospinning. Morphological, thermal and electrical properties of the scaffolds were characterized by SEM, Raman spectroscopy, XRD, DSC and electrical measurements. The diameter of the fibers decreased from 0.52 to 0.19 µm as the concentration of rGO increased from 0.1 wt% to 20 wt%. The presence of rGO above the percolation threshold (5.7 wt%) resulted in a significantly reduced electrical resistivity of the scaffolds. XRD and Raman analysis revealed delamination of the graphene layers (interlayer spacing increased from 0.36 nm to 0.40–0.41 nm), and exfoliation of rGO was detected for the samples with an rGO concentration lower than 1 wt%. In addition, an evident trend of increasing cell viability as a function of the rGO concentration was evidenced. The obtained results can serve as further guidance for the judicious selection of the rGO content incorporated into the PEO matrix for constructing electroactive scaffolds.

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Section: Resultssupporting

confidence: 66%

Electrospun PEO/rGO Scaffolds: The Influence of the Concentration of rGO on Overall Properties and Cytotoxicity

Ivanoska-Dacikj

Makreski

Geškovski

et al. 2022

IJMS

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“…This suggested that, above a certain amount of EOMt in the matrix, a synergism engenders between EOMt and MWCNT, resulting in a sharp spin concentration decrease in the samples. The synergism between these two nanofillers was also reported in some previous works [16][17][18][19], manifested by their better dispersion in some solvents and polymer matrices, but this was for the first time demonstrated by changes in the ESR spectra of the MWCNT in dependence of the EOMt concentration in the nanocomposites.…”

Section: Introductionsupporting

confidence: 74%

Electron Spin Resonanceon Hybrid Nanocomposites Based on Natural Rubber

2018

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Electron spin resonance (ESR) was used as a new method to analyze the synergy between two nanofillers different by nature, form and rigidity dispersed in natural rubber matrix. Natural rubber (NR) nanocomposites loaded with fixed amount of carbon nanotubes (2 parts per hundred of rubber parts; phr) and various amounts of expanded organically modified montmorillonite (EOMt, 4-20 phr) were investigated. The dependence of the double integral of the resonance spectra on the amount of EOMt present in the natural rubber was established. Its decrease with an increaseof the amount of EOMt confirmed the synergy between these two nanofillers. Also DMA temperature sweep measurements were performed and the cluster-cluster aggregation (CCA) model was used to assess the apparent filler networking energy. The obtained results suggest that the presence of the EOMt above a critical amount strengthens the hybrid-filler networking.

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“…17 Furthermore, the combination of these two nanofillers engenders synergism which results in their better dispersion. [18][19][20] This in turn enhances the mechanical properties of the rubber, something that was confirmed in recent publications. 21,22 Therefore in our study, 22 preceding this one, a series of natural rubber (NR)-based nanocomposites containing these two most exploited nanofillers, organomontmorillonite (OMt) which layers were further expanded for better dispersion (EOMt) and multiwall carbon nanotubes (MWCNT), were prepared.…”

Section: Introductionsupporting

confidence: 68%

Assessment of the dynamic behavior of a new generation of complex natural rubber-based systems intended for seismic base isolation

Ivanoska-Dacikj

Bogoeva‐Gaceva

Jurk

et al. 2016

Journal of Elastomers & Plastics

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This work, conceived as a second step in the development of high-performance damping materials suitable for seismic application, describes the preparation and characterization of complex natural rubber-based composites containing hybrid nano- and conventional fillers. The cluster–cluster aggregation model was used to assess the apparent filler networking energy. The values obtained suggested that the presence of the hybrid nanofiller strengthens the filler networking. The same model was used to understand the mechanisms of energy dissipation. The damping coefficient was found to be in the sought range between 10% and 20% (at 0.5 Hz and high shear strain).

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Clay Improved Dispersion of Carbon Nanotubes in Different Solvents

Cited by 4 publications

References 25 publications

Electrospun PEO/rGO Scaffolds: The Influence of the Concentration of rGO on Overall Properties and Cytotoxicity

Electrospun PEO/rGO Scaffolds: The Influence of the Concentration of rGO on Overall Properties and Cytotoxicity

Electron Spin Resonanceon Hybrid Nanocomposites Based on Natural Rubber

Assessment of the dynamic behavior of a new generation of complex natural rubber-based systems intended for seismic base isolation

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