A Study of Factors that Change the Wettability of Titania Films

Table 1

Table of water contact angles for Activ and glass samples before and after pretreatment.

Pretreatment method	Activ		Glass
	initial CA/^°	final CA/^°	initial CA/^°	final CA/^°
UVC/O3	71	<5	35	<5
Δ 500^°C	70	<5	37	<5
Aqua regia	70	<5	38	<5

Samples irradiated by  W UVC bulbs in ~1700 ppm O₃ for 1 hour.
Samples heated to 500^°C and held at temp for 1 hour before cooling under Petri dish.
Immersion in 25 mL aqua regia for 1 hour before rinsing and drying.