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Matls 701/702: Xinqian (Jessica) Liu, PhD Candidate

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ABB 163

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Novel Colloidal Methods for Fabrication of Poly-composite Coatings with Advanced Functionality


Polymer coating deposition on a wide variety of engineering substrates has gained significant attention due to its wear resistance, corrosion resistance, chemical resistance, and weathering resistance. Various coating methods have been successfully employed to coat the substrates, of which EPD and dip coating are two promising methods considering about the ease of fabrication, low expenses, and high-volume production. However, for EPD method, the charging and dispersion of polymers still present difficulties. For dip coating method, the polymers with low molecular weight (MW) show weak film-forming and binding properties, and the solubility of polymers decreases with increasing MW, while it is difficult to achieve good substrate coverage using dilute polymer solutions. Moreover, there is a need to find non-toxic solvent for deposition of polymers for environmentally friendly purpose.

To solve these problems, we pick several functional polymer and inorganic particles for investigation. The feasibility of bile acid family was investigated for surface modification, dispersion and charging of various functional materials, such as diamond, graphene, carbon dots, and polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) and their deposition by EPD. Moreover, a non-toxic water-isopropanol co-solvent was proposed to dissolve PEMA with high MW despite the PEMA insolubility in water and isopropanol. The dip coating method was used for the fabrication of composite coating, containing layered double hydroxide LiAl2(OH)7.2H2O and PEMA. In addition, the multifunctional properties of the as-deposited composite coatings has been explored in this work. Both proposed methods are promising for the fabrication of other poly-composites coatings, containing various functional materials, which can be explored further.