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Wettability: By Contact Angle

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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...

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