Effect of surface functionalization by naoh on electrophoretic deposition of h-BN particles

Lai, Chii Chung (2016) Effect of surface functionalization by naoh on electrophoretic deposition of h-BN particles. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

H-BN has no functional groups such as amine and hydroxyl groups that can be used for bonding or interactions. For effective use of h-BN particles, surface functionalization is necessary for h-BN to functionalize h-BN by adding functional groups to its surface. The effectiveness of the surface functionalization is greatly depended on the processing parameters used during the surface functionalization of the particles. Thus, the optimum processing parameters such as treatment time is needed to be determined and to be refined in order to obtain functionalized h-BN particles which suitable for electrophoretic deposition (EPD) method. Functionalization of hexagonal boron nitride (h-BN) particles was successfully achieved by treating raw h-BN particles with sodium hydroxide (NaOH) solution. The particles were treated with different period of time (6 hours, 12 hours, 24 hours) to study the effect of time on the functionalization of h-BN particles. Sedimentation tests was used to evaluate the effectiveness of the functionalization process of h-BN particle. Results clearly show that h-BN (Nova Scientific) suspensions have similar stability for the period of time studied where as h-BN (Showa Denko) displayed much lower stability. The functionalized h-BN particles were successfully deposited on targeted metallic substrate by using electrophoretic deposition (EPD) method. Different potential difference (160 V, 190 V, 220 V) were applied across the EPD electrodes. Optimum voltage which produces the highest yield coating and the functionality of poly(diallyldimethylammonium chloride) in this coating system.

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