Another process of controlled precipitation of zinc oxide was carried out by Wang et al. [ 39 ]. Nanometric zinc oxide was obtained by precipitation from aqueous solutions of NH 4 HCO 3 and ZnSO 4 ·7H 2 O by way of the following reactions (3) and (4): 5 ZnSO 4 ( aq ) + 10 NH 4 HCO 3 ( aq ) → Zn 5 ( CO 3 ) 2 ( OH ) 6 ( s ) + 5 ( NH 4 ) 2 SO 4 ( aq ) + 8 CO 2 ( g ) + 2 H 2 O ( l ) (3) Zn 5 ( CO 3 ) 2 ( OH ) 6 ( s ) → 5ZnO ( s ) + 2 CO 2 ( g ) + 3 H 2 O ( g ) (4)
Similar in properties to Silver Acetylide, except
that like Calcium Carbide it is easily decomposed in water. The synthesis has to
be performed very rapidly and the product must be washed thoroughly in anhydrous
ethanol and vacuum desiccated if any reasonable yield is to be had. This
particularly procedure employed a solution of Copper Chloride in dilute ammonia.
The result is a rust colored powder which detonates with a bright orange (due to
carbon) fireball. The detonation is more energetic than for the Acetylide (47%
TNT, as compared to 33% TNT for Ag2C2), but less violent when unconfined.
Click on the pictures to watch the Copper Carbide detonation video: (696k)