Table showing the variation of the average surface roughness (Ra), Secondary arm spacing (SAS), size of secondary dendrites, fso and contact angle of oil (ϴoil)at the solid-water interface.

Table 1: Table showing the variation of the average surface roughness (R_a), Secondary arm spacing (SAS), size of secondary dendrites, f_so and contact angle of oil (ϑ_oil)at the solid-water interface.

Etching time (seconds)	Ra	SAS	Size of secondary dendrite	f_so (from eqn. 1)	f_so (from eqn. 2)	ϑ_oil
0	0.1	-		-		54 ± 2°
5	0.35	5.31 ± 1.54	14.14 ± 3.16	0.57	0.89	103.28 ± 1.32°
10	0.42	5.40 ± 1.30	12.39 ± 2.67	0.53	0.68	114.44 ± 6.02°
15	0.61	5.53 ± 1.76	12.32 ± 1.12	0.52	0.41	130.61 ± 0.99°
20	0.74	6.16 ± 2.35	11.61 ± 2.88	0.48	0.08	159.96 ± 0.64°