Preparation of Nanostructured Microporous Metal Foams through Flow Induced Electroless Deposition

Figure 6

Size of the spherical grain deposits varied depending on the concentration of the plating bath. Amount of the reducing agent sodium hypophosphite and volume of solution used were (a) 0.63 M and 200 mL, (b) 1.26 M and 200 mL, and (c) 2.52 M and 600 mL. (d) In this example, we also used 0.26 M dimethylamine borane as the reducing agent and 600 mL solution was used. Regarding the size of the deposits, (a) Ni-P grain diameters ranged from 5 to 20 μm, (scale bar = 50 μm); (b) Ni-P grain diameters ranged from 2 to 12 μm, (scale bar = 20 μm); (c) Ni-P grain diameters ranged from 0.5 to 2 μm (scale bar = 5 μm); (d) Ni-B grain diameters were in the order of a few hundred nanometers (scale bar = 2 μm).

(a)

(b)

(c)

(d)