Electrophoretically Al-coated wire mesh and its application for catalytic oxidation of 1,2-dichlorobenzene Kyung Shik Yanga, Zhidong Jiangb, Jong Shik Chunga,* Surface and Coatings Technology 168 (2003) 103–110 Advisor : Prof. S.C.Wang Advisee : Jyun-Jia Huang 2010/01/29

outline Experimental Results and discussion Conclusions Future work

EPD 參數 DC = V cathode ： wire mesh (3.5 cm X10 cm) anode ： Steel distance = 10 mm deposition time = 1 min dried at room temperature for 12 h and sintered at 500 ， 800°C in He for 5 ， 3 h Experimental Ethanol (99.9%) PAA alumina 球狀 99.9% <0.6 wt.% EPD dried at room temperature SEMXRD IPA ultrasonic bath for 3 min 分散劑凝聚劑 1 wt.% NH 4 OH to remove oxidized layers

Results and discussion

Effect of additive’s concentration during electrophoretic deposition of aluminum BET surface areas

Deposit amount vs. deposition time as a function of applied voltage. Pore size distribution of the Al-coated wire mesh

SEM pictures of cross sectional area of the Al-coated wire mesh. (a)Sintered at 800 ° C for 3 h with He. (b)Calcined at 500 ° C for 5 h after sintering. thickness was 100~120 mm.

SEM pictures of the surface of the Al-coated wire. (a) Low magnification ( X3000 ). (b) High magnification ( X6000 ).

EDAX spectra of the Al-coated wire after calcination (500 ° C, 5 h).

Conclusions The thickness and uniformity of the coating layer can be controlled by adjusting voltage, time and slurry composition. The coated layer is suitably porous and shows a good adherence to the wire surface due to sintering of aluminum particles after thermal treatment at 800 ° C. An additional calcination at 500 ° C forms a thin layer (~30 nm in thickness) of oxide phase on each aluminum particle in the deposited layer.