This should not exceed the recommended time for better intended results as with increased exposure to disinfectant the contact angle
of VPS increases.
The wettability of a solid surface could be characterized by its contact angle
. The changes of the water contact angle
and surface roughness of the composite coating with the PCM content are shown in Fig.
The most important is that when the roughness of the substrate increases, the contact angle
of the droplet decreases, which leads to an increased evaporation rate at the edges.
Figure 2 shows that there is a difference in contact angle
between jatropha curcas oil, sunflower oil, and coconut oil, due to the different fatty acid compositions.
It is found in Tables 2 and 3 that the bigger initial wetting angle leads to bigger advancing contact angle
and smaller receding contact angle
Time dependency of droplets of liquids as they transition from an initial contact angle
to an equilibrium contact angle
can be represented as a K value (Shi and Gardner 2001).
This shows the relationship between sand type and contact angle
of liquid gallium.
Group F showed the highest mean contact angle
value (98[degrees]) of all the groups, and the least was Group C (59[degrees]).
The droplet exhibits a contact angle
of 100.4[degrees] at 0 V.
Another approach proposed by Chibowski [24-26] is based on the contact angle
Switchable surfaces with spiropyran did not show similarly high contact angle
differences as with azobenzene so far.
The hydrophobicity of the film was measured by checking contact angle
of water dropped on the film surface using contact angle
Influence of contact angle
(receding, advancing and equilibrium) on the minimum wetting rate is confirmed as well as the influence of the plate inclination angle .
Two main output variables were used to determine if a correlation exists: (1) contact angle
as measured by goniometer, and (2) stain repellency as determined by a standard coating stain repellency test method, measured using a colorimeter for absolute change in the [L.sup.*] value in the [L.sup.*] [a.sup.*] [b.sup.*] color space.