User:Benjah-bmm27/degree/2/JPR

• Interface (chemistry)
• Colloid
• Surfactants
• Detergency
• Critical micelle concentration
• Surface tension, Surface energy

• Contact angle

if contact angle θ = 180°, liquid does not wet solid substrate

if contact angle θ = 0°, liquid perfectly wets the solid substrate and spreading occurs

if contact angle 0° < θ < 180°, liquid-substrate interface formed, liquid partially wets solid surface

• Wetting

• spreading coefficient:

$\ S=\gamma {\mbox{(water-vapour)}}-\gamma {\mbox{(oil-vapour)}}-\gamma {\mbox{(oil-water)}}>0$

• Young-Dupre equation:

$\cos {\theta }={\frac {\gamma {\mbox{(solid-vapour)}}-\gamma {\mbox{(solid-liquid)}}}{\gamma {\mbox{(liquid-vapour)}}}}$

• Capillary rise:

$h={2{\gamma } \over {r\rho g}}$

where:

$\ h$ = height of capillary rise

$\ \gamma$ = surface tension

$\ r$ = radius of the capillary

$\ \rho$ = density of liquid

$\ g$ = gravitational acceleration

• Surface roughness

• Adhesional wetting:

$\ S=\gamma _{\text{SV}}+\gamma _{\text{WV}}-\gamma _{\text{WS}}>0$

• Immersion wetting:

$\ S=\gamma _{\text{SV}}-\gamma _{\text{WS}}>0$

• Critical radius
• Emulsion
• Bancroft rule: "The phase in which an emulsifier is more soluble constitutes the continuous phase"
• Vapor pressure , Supersaturation, Nucleation

• Kelvin equation:

$\ln {\frac {p_{r}}{p_{0}}}={\frac {2\gamma V_{m,l}}{rRT}}$