Electrophoretic Deposition of Carbon Nanotubes onto Carbon Fiber Laminated Composites: Effect of Suspension Medium, Deposition Voltage, and Time

Nur-Azzah Afifah, Taib (2023) Electrophoretic Deposition of Carbon Nanotubes onto Carbon Fiber Laminated Composites: Effect of Suspension Medium, Deposition Voltage, and Time. Masters thesis, Faculty of Engineering.

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Abstract

Multiwalled carbon nanotubes-Carbon Fiber (MWCNT–CF/) epoxy laminated composites are widely used in many applications, and electrophoretic deposition (EPD) is a hybridisation method that is often used. This research focuses on improving the technique by optimising the input parameters to obtain composites with enhanced tensile properties. Various studies have utilized the EPD method, but there hardly any study utilized the water-methanol mixture as the medium. This study showed that the input parameters (volume ratio of suspension medium, deposition voltage, and time) influenced the responses of the research (tensile strength and Young’s modulus). Firstly, the optical observation showed good distribution of MWCNTs throughout the medium. Secondly, the analyses of Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM), and tensile properties demonstrated that the input factors directly influenced the composites. Thirdly, the ideal factors that correspond to the desired responses were obtained through the optimization. For the first design of experiment (DoE) (0% water, 100% methanol and 100% water,0% methanol), the optimum conditions were a volume ratio of 99.99% water, a voltage of 20V, and time of 8.88 minutes, producing maximum tensile strength and young’s modulus of 7.983 N/mm2 and 268.558 N/mm2, respectively. For the second DoE (20% water,80% methanol and 80% water, 20% methanol), tensile strength and young’s modulus of 7.2766 N/mm2 and 266.78 N/mm2, respectively, were achieved when the ideal conditions were: volume ratio of 79.99 % water, voltage of 20V, and time of 5.22 minutes. Keywords: MWCNTs, CF, epoxy, EPD, tensile properties

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