Contact angle and surface free energies of untreated and treated TNZ substrates.

Substrates	Contact angle (°)		Surface free energy (mN m−1)
	Water	Diiodomethane	Polar	Dispersive	Total
UT	88.7 ± 4	43.8 ± 6	1.1	28.6	29.7
ST1	32 ± 5	19.4 ± 4	39.7	49.4	89.1
ST2	33 ± 6	26.6 ± 5	36.5	46.3	82.8
ST3	44 ± 5	30.5 ± 4	23.9	41.6	65.5