Table 2.

Pore size variations of micropores in relation to electrolyte concentrations.

Electrolyte	Low Concentrations	Pore Sizes	High Concentration	Pore Size	Ref.
Ca3(PO4)2
•3 min PEO, pulsed wave 400–600 V, 50Hz, 400 A/m2	2 and 4 g/L	~1 μm2	6–10 g/L	some nm2 up to 9 μm2	[213]
CH₃COOH
•30 min MAO, 210 V at 200 mA	0.01 and 0.1 M	order of 1 μm Ø	0.5 M	10 μm Ø, but some were small ~1 μm Ø	[199]
H2SO4
•0.5 h MAO, 210 V at 50 mA/cm2	0.1 M	tens of nano to micrometres	1.2 M	~50 μm	[231]