Wettability: By Contact Angle
Wettability of Powder: · Wettability is the tendency of one liquid / fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids / liquid. · Wettability refers to interaction between fluid and solid phases. · It may affect granulation of solid, penetration of dissolution fluid into tablet and granules & adhesion of coating material to tablet. Method of determination: · By contact angle: o It is the angle between a liquid droplets and the surface over which it spreads o OR// o Angle between a solid particle and liquid medium over which it is placed. o Contact angle - 0 0 – complete wetting o Contact angle - 180 0 – not we...