Present typescript encompasses the influences of functionalization on the carbon nanotubes (CNTs) using acid oxidation which has been widely reported not only as a purification process but also as functionalization process because it is an effect on the outer surface on CNTs. Therefore, using strong acid effect and high power sonication in addition to the nature of the acid mixture (H2SO4/HNO3) with CNTs confirm that adequate volume of carboxyl groups decorate the outer surface, this functionalization process improve the dispersibility of the CNT in the response of the final dimension of the CNTs. Because of using a high temperature for a long time more than 6 hours. This work interested in the aspect ratio (L/D) and the final shape of the tubes by using a mild temperature process 50°C with concentration acid for not long time 5 hours, in an attempt to make experimental condition which guarantees good functionalization of the surface of MWNTs with minimizing the CNTs damage, The results were confirmed by Thermogravimetry Analysis (TGA), Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analysis. In addition to the functionalization process we try to save the loss in the weight during the filtration step, in addition to decrease the time during filtration of the materials after sonication. Where the results show that actually functionalization has been done with an adequate amount at this condition, and the dilution for 2 days before filtration have been approved to be easier and faster than direct filtration after treatment.
Carbon nanotubes are viewed as one of the stiffest and strongest designing materials accessible, having high ultimate strength and modulus of elasticity more than any conventional materials. A new epoxy resin material called (Biresin CR82) was utilized as a matrix in manufacturing nanocomposites reinforced by carboxylic Multiwall carbon nanotubes (MWCNTs). A novel experimental setup was carried out with specified steps under certain conditions to achieve suitable mixing techniques for the different content of MWCNTs, using ultrasonication technology as the main mixing technique. This paper concerned about the mechanical properties of the generating MWCNT/epoxy composite materials with different loading ratios. The main objective was about how to get maximum benefit from low weight percentage of MWCNTs dispersed homogeneously in the matrix. Therefore, mechanical tests were carried out to determine the effect of nano-particles on the quality and strength of the composites. The mechanical test results demonstrated the highest enhancement at 0.2 wt. % of COOH-MWCNTs in the ultimate strength, elastic modulus, and impact energy by 41%, 22%, and 45% respectively. In addition to improving the shore hardness values at D scale with an increase in the weight percentage of MWCNTs, and the highest value showed at 0.2 wt. %. The Halpin Tsai equations were utilized to obtain theoretical modeling which gives a great indication with the tensile experimental results acquired. The microstructure of the fracture tensile sample was assigned by scanning electron microscopy.
This article focused on further investigation of passive vibration damping of a cantilever plate using carbon nanotube/epoxy nanocomposite. A damping ratio depends on many factors, for example carbon nanotube content, type of carbon nanotubes, and frequency, so the epoxy composite reinforced with 0.2 wt. % multi-wall carbon nanotubes has been used with structural damping. Dynamic analysis for an aluminum cantilever plate has been studied to determine the effect of the epoxy nanocomposite material on the plate vibration. The main goal of the study was to minimize the frequency response function amplitude and shift the resonant frequency of the plate as high as possible, especially for the fundamental frequency. An finite element model exhibited an increase in the resonant frequency by 10.6% and 1.2% in addition to a reduction in the frequency response function amplitude by 79.5% and 43.26% at the first and second bending modes, respectively, when using 0.2 wt. % multi-wall carbon nanotubes/epoxy circular patches at an optimal position compared with the bare plate. In case of using a stiffener below the plate, the results exposed an increase in resonant frequency by 154.6% and 181.7%, whereas the frequency response function amplitude showed reduction by 95.9% and 98.2% at the first and second bending modes, respectively, when using three stiffeners of multi-wall carbon nanotubes/epoxy nanocomposite with the same mass of circular patches compared also with the bare plate.
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