Thermo-oxidative resistant nanocomposites containing novel hybrid-nanoparticles based on natural polyphenol and carbon nanotubes

Arrigo, Rossella; Dintcheva, Nadka Tzankova; Guenzi, Monica; Gambarotti, Cristian; Filippone, Giovanni; Coiai, Serena; Carroccio, Sabrina

doi:10.1016/j.polymdegradstab.2015.02.014

Cited by 38 publications

(19 citation statements)

References 39 publications

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“…However, the immobilization through chemical linkage or physical absorption of antioxidant molecules onto the surface of nanoparticles, i.e., using the particles as carrier for antioxidant molecules, is a new approach for “smart” efficient stabilization of polymer and biopolymer-based nanocomposites, obtaining materials with enhanced durability [ 55 , 56 , 57 , 58 ]. Applying this approach, the antioxidant functionalities act at the interface between the inorganic and organic phase, which is the critical zone for the begging of the degradation processes of polymer- and biopolymer-based nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection

et al. 2020

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In the last decade, the interest toward the formulation of polymer films for cultural heritage protection continuously grew, and these films must be imperatively transparent, removable, and should not react/interact with surface of the artworks. In this research, bionanocomposite films, based on chitosan (Ch) and pectin (P) and containing naturally occurring fillers and antioxidants, were formulated by solvent casting methods and were accurately characterized. The natural halloysite nanotubes (HNT) have a two-fold role, specifically, physical compatibilizer and antioxidant carrier. Therefore, the theoretical solubility between Ch and P was estimated considering Hoy’s method for solubility of polymers, while the optimum ratio between biopolymer constituents was assessed by ζ-potential measurements. The transparency, wettability, and mechanical behavior of Ch:P films, also in presence of HNT without and with antioxidants, were investigated. The beneficial effects of natural antioxidants, such as vanillic acid (VA) and quercetin (Q), on Ch:P/HNT durability were found.

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Section: Introductionmentioning

confidence: 99%

Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection

et al. 2020

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“…The peaks at 1210 and 1218 cm −1 represent CO stretching vibration and COH stretching vibration peaks for RuO 2 /MWCNT nanocomposite at [RuO 2 ] o /[MWCNT] o = 3:1 and 2:1, respectively. The peak at 1362 cm −1 indicates symmetric bonding vibration of methyl groups . In addition, the peak shifts to 1367 cm −1 as OH stretching vibration of phenolic OH bonds .…”

Section: Resultsmentioning

confidence: 99%

Supercapacitor performances of RuO₂/MWCNT, RuO₂/Fullerene nanocomposites

et al. 2019

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In this study, RuO2/Fullerene and RuO2/MWCNT nanocomposites were synthesized to use as an electroactive materials in symmetric supercapacitor device performances. The materials were examined via Fourier transform infrared spectroscopy‐attenuated total reflectance (FTIR‐ATR), thermo‐gravimetric analysis (TGA‐DTA), scanning electron microscopy‐energy dispersive X‐ray analysis (SEM‐EDX), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The RuO2/MWCNT and RuO2/Fullerene nanocomposite electrodes show good electrochemical performances. For instance, the highest specific capacitance of RuO2/Fullerene and RuO2/MWCNT electrodes reaches Csp = 3895.11 and 1662.19 F/g at 1 mV/s within the potential range of 0.8 V in 1 M H2SO4 solution. RuO2/MWCNT and RuO2/Fullerene nanocomposites have good cycle stability ~100% specific capacitance at [RuO2]o/[MWCNT]o = 1:1; 2:1 and [RuO2]o/[Fullerene]o = 2:1, respectively. The different equivalent circuit models of LR1Q(C1R2) and LR1(Q1R2)(Q2R3) were used to interpret EIS data.

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“…Raman spectroscopy is a technique used for identifying any disorder or change in the sp 2 carbon-carbon bonds [35]. Carbon nanotubes usually reveal two main peaks: D-band (1330 cm −1 ) and G-band (1580 cm −1 ), which are associated with the defect and graphitic structure, respectively, and the ratio of these two peaks can be used to evaluate the effectiveness of the employed chemical functionalization processes [36][37][38][39]. Here in this study, strong acids (i.e., sulfuric and nitric acids) were used to generate vacancy defects on perfect/inert crystalline structures of the HCNTs, which later can be used for attaching different functional groups.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…In general, the functionalization process leads to changes in four regions of the FTIR spectra. These four regions are (-C-O) stretch between 1000 and 1300 cm −1 [36,40,41], (-C=C) aromatic stretch between 1500 and 1600 cm −1 [40][41][42], (-C=O) carboxylic acids between 1650 and 1730 cm −1 [36,40,41,43,44], and (-O-H) carboxylic acids hydrogen stretch between 2400 and 3400 cm −1 [37, Figure 4 shows the FTIR spectra of the chemically functionalized HCNTs in comparison to the pristine HCNTs sample.…”

Section: Fourier-transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

Chemical Functionalization of Helical Carbon Nanotubes: Influence of Sonication Time and Concentrations of Sulfuric and Nitric Acids with 3 : 1 Mixing Ratio

Taklimi

Ghazinezami

Askari

2019

Journal of Nanomaterials

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Carbon nanotubes (CNTs) with straight geometries have been widely studied for various engineering applications, and they are often treated or functionalized to improve their effectiveness, depending on their role and expected performance. However, helical configurations of CNTs (HCNTs) have not been sufficiently investigated, especially in their functionalized states for high-performance nanocomposite applications. The coil-shaped geometry of these HCNTs increases the mechanical entanglement of these nanotubes with a host resin system when they are used as reinforcements. This consequently has the potential to improve the mechanical, thermal, electrical, and magnetic properties of the polymeric matrix systems. A uniform dispersion of CNTs in the resin plays an important role in obtaining improved and consistent properties in the final nanocomposite part. To improve the homogeneous dispersion (individual suspension) of these nanotubes in the host resin and to enhance their interactions/bonds with the resin molecules, the surface of these nanotubes should be modified. This study investigates a sonication method for chemical functionalization of HCNTs using a mixture of sulfuric and nitric acids with 3 to 1 mixing ratio [3 : 1], and it evaluates the effects of acid concentrations and sonication time on the severity of the functionalization process. To evaluate the effectiveness of the process parameters, the functionalized HCNTs (FHCNTs) were examined using several characterization instruments and techniques such as Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD), visual dispersion test, and Raman spectroscopy. The characterization results confirmed that the changes in process parameters were mostly effective and the atomic structures of the functionalized HCNTs were successfully altered. All FHCNT samples demonstrated higher dispersion uniformity, increase in Raman ID/IG ratios, and changes in the FTIR spectra compared to the pristine HCNTs. Most of the FHCNTs had a reduction in crystallinity, which was consistent with our expectation that functionalization generates more defects on the surface structure of HCNTs, thus leading to a lower intensity of the graphitic peak. The largest reduction in crystallinity was seen for HCNTs treated with a 16 molarity acidic solution; therefore, the HCNTs that were treated with lower molarity acids could be used for further studies and explored for their effective applications in improving the mechanical, thermal, and electrical properties of polymeric nanocomposites.

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Thermo-oxidative resistant nanocomposites containing novel hybrid-nanoparticles based on natural polyphenol and carbon nanotubes

Cited by 38 publications

References 39 publications

Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection

Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection

Supercapacitor performances of RuO₂/MWCNT, RuO₂/Fullerene nanocomposites

Chemical Functionalization of Helical Carbon Nanotubes: Influence of Sonication Time and Concentrations of Sulfuric and Nitric Acids with 3 : 1 Mixing Ratio

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Thermo-oxidative resistant nanocomposites containing novel hybrid-nanoparticles based on natural polyphenol and carbon nanotubes

Cited by 38 publications

References 39 publications

Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection

Bionanocomposite Films Containing Halloysite Nanotubes and Natural Antioxidants with Enhanced Performance and Durability as Promising Materials for Cultural Heritage Protection

Supercapacitor performances of RuO2/MWCNT, RuO2/Fullerene nanocomposites

Chemical Functionalization of Helical Carbon Nanotubes: Influence of Sonication Time and Concentrations of Sulfuric and Nitric Acids with 3 : 1 Mixing Ratio

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Supercapacitor performances of RuO₂/MWCNT, RuO₂/Fullerene nanocomposites