The object of this study was to develop an easy and simple technique to fabricate the coating solutions based on Viet Nam rice husk ash-derived water glass (VRHA-WG) and Viet Nam coconut oil (VCO). The coating solutions with different mixing ratios of VRHA-WG and VCO such as 1:5 and 1:10 (v/v) coated on copper substrates. | Characteristics of silica coating on copper substrate using coconut oil as a dispersion medium