Preparation and Characterization of Multiwall Carbon Nanotube (MWCNT) Reinforced Chitosan Nanocomposites: Effect of Gamma Radiation

Zaman, Asaduz; Rashid, Taslim Ur; Khan, Mubarak A.; Rahman, Md. Mizanur

doi:10.1007/s12668-014-0159-0

Cited by 12 publications

(9 citation statements)

References 26 publications

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“…Also, F-MWCNTs structure shows an anomaly with defects on the surface of tubes. The average tube diameters of R-MWCNTs and F-MWCNTs are about 29.59nm and 34.62nm, respectively [22,23]. The results obtained from the FE-SEM analysis are similar to a study prepared by Karthikeya et al [24].…”

Section: Resultssupporting

confidence: 76%

Characterization of Treated Multi-Walled Carbon Nanotubes and Antibacterial Properties

Ali¹,

Taha²,

Ahmed³

2021

JASN

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In the present study, the synthesized Multi-Walled Carbon Nanotubes (MWCNTs) were chemically treated with a mixture of acids to produce functionalized MWNTs. The functionalized MWCNTs were characterized by X-Ray Diffraction Analysis (XRD), Zeta potential and Field-Emission Scanning Electron Microscopy (FE-SEM). The X-ray diffraction reveals the MWCNTs average crystal size of the R-MWCNTs and F-MWCNTs were about (3.27 and 3.19) nm, respectively. FESEM images show the formation of R-MWCNTs that appears as cylindrical tubes and aggregated tubes with each other, while the F-MWCNTs appear as less aggregated and tangled clusters than R-MWCNTs. Zeta potential measurements showed that the measurement of the R-MWCNT shows a low negative value -9 mV and F-MWCNT, it was found that the zeta potential value is up to -29 mV. The antibacterial activity was studied against E. coli and P. aeruginosa bacteria, and indicated the highest growth inhibition zones (IZ) of F-MWCNTs as compared with R-MWCNTs against E. coli and Pseudomonas aeruginosa, respectively.

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Section: Resultssupporting

confidence: 76%

Characterization of Treated Multi-Walled Carbon Nanotubes and Antibacterial Properties

Ali¹,

Taha²,

Ahmed³

2021

JASN

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“…The gradual incorporation of GO into the matrix was found to enhance the thermal stability of the composites gradually. A very negligible loss of initial weight up to 150 °C indicates the presence of a trace amount of moisture and solvent due to high‐temperature curing while the significant weight loss above 250 °C has been ascribed to the decomposition of organic moieties . Degradation temperature ( T deg ) of the composite was found to be enhanced approximately by 45.76 °C with 1.0 wt% of GO content whereas similar studies on the reinforcement of epoxy system by Yousefi et al.…”

Section: Resultssupporting

confidence: 56%

“…Such drastic improvements in tensile properties in the present work can be attributed to (i) the improved interfacial adhesion between GO sheets and resin (π‐π interactions and hydrogen bonding as shown in Scheme ) (ii) better stress transfer from matrix to the reinforcement (iii) large aspect ratio and molecular level dispersion of GO and (iv) degassing the mixture of GO, epoxy and curing agent through shear mixing by a thinky mixer whether a slight decrease in strength and stiffness in case of the composites nearly to epoxy matrix above 0.5 wt% of GO can be explained by poor stress transfer from matrix to reinforcement due to agglomeration of GO sheets . Congruent to the strength and stiffness, a decrease in the percentage elongation at break from 14.44% for the neat epoxy, to 10.12% and 13.70% for the composites with 0.5 and 1.5 wt% GO, respectively indicates enhanced strength and restricted movement of the polymer chain …”

Section: Resultsmentioning

confidence: 99%

Enhanced Epoxy/GO Composites Mechanical and Thermal Properties by Removing Air Bubbles with Shear Mixing and Ultrasonication

et al. 2019

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Epoxy‐graphene oxide composites were prepared through the homogeneous dispersion of graphene oxide (GO) in epoxy via shear mixing and ultrasonication techniques. Mechanical and thermal properties of the composites were evaluated. Final composite samples were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, optical microscope, differential scanning calorimetry, thermogravimetric analysis, and x‐ray diffraction analyses. The thickness of the prepared GO sheet was calculated by atomic force microscopy. Herein, we report a remarkable enhancement in thermal along with mechanical properties of diglycidyl ether of bisphenol‐A (DGEBA) based epoxy matrix upon adding small amounts (≤1.5 wt%) of GO into the glassy epoxy system. With the incorporation of only 0.5 wt% GO the tensile strength and Young's modulus were found to be increased by 67.4% and 43.2%, respectively compared to neat epoxy; in addition, 3.7 folds improvement was achieved in the impact strength at the same GO content. In agreement with mechanical properties, resulting composites also showed better thermal stability together with promising improvement in glass transition temperature. The glass transition temperature was enhanced by 25.8 °C for the composite with 0.1 wt% GO. Therefore, the prepared composite will have potential applicability in the field of material science with improved mechanical and thermal response.

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“…Additionally, F-MWCNTs structure exhibits irregularity with defects on the surface of the tubes. The mean particle size of R-MWCNTs and F-MWCNTs is (21.06 nm, 33.99 nm), respectively[20]. Figure5a & 5 b represents the FE-SEM analysis of the ZnO\MWCNTs hybrid at different magnifications.…”

mentioning

confidence: 99%

Investigation of Morphological, Optical, and Antibacterial Properties of Hybrid ZnO-MWCNT Prepared by Sol-gel

Khedaer¹,

Ahmed²,

Al-Jawad³

2021

JASN

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In this research, raw multiwalled carbon nanotubes (R-MWCNT) was successfully functionalized using sulfuric acid and nitric acid. Then a hybrid (ZnO-MWCNT) synthesized by the sol-gel method where diethylene glycol was used as a solvent and stabilizer that works to prevent the accumulation of nanoparticles and reduces the viscosity of the solution. A group of diagnostic techniques, including XRD, UV-Vis, EDX and microscopy has recognized the structural and optical properties of the prepared nanoparticles. High Resolution Electronic Scanner (FE-SEM) was also used in the investigation. FE-SEM images showed the formation of the hybrid (ZnO-MWCNT) by the growth of spherical clusters on the surface of the cross-linked tubes (MWCNT). In addition, FE-SEM images confirmed the success of a ZnO-MWCNT hybrid. The emergence of spherical shapes deposited on cylindrical tubes and associated with a wrinkled surface was recognized. In addition, the particle size ratio increased. The UV-Vis spectra revealed that all the composites had good absorbency with a shift towards short wavelengths. While it was observed from the analysis of X-ray diffraction (XRD) the formation of a hexagonal wurtzite crystal structure due to zinc oxide with a polycrystalline nature. The average crystal size calculated from the Debye-spark equation increased with the increase in the concentration of the streaked material. Antibacterial activity was studied for all prepared samples against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) at different μg/ml concentrations (500, 750, and 1000). It was observed that the highest inhibition Zone for functionalized multiwalled carbon nanotubes (F-MWCNT) and 12.3mm), (22.5, 19mm) for Escherichia coli and Staphylococcus aureus, respectively.

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Preparation and Characterization of Multiwall Carbon Nanotube (MWCNT) Reinforced Chitosan Nanocomposites: Effect of Gamma Radiation

Cited by 12 publications

References 26 publications

Characterization of Treated Multi-Walled Carbon Nanotubes and Antibacterial Properties

Characterization of Treated Multi-Walled Carbon Nanotubes and Antibacterial Properties

Enhanced Epoxy/GO Composites Mechanical and Thermal Properties by Removing Air Bubbles with Shear Mixing and Ultrasonication

Investigation of Morphological, Optical, and Antibacterial Properties of Hybrid ZnO-MWCNT Prepared by Sol-gel

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