Some Important Questions from Surface and Interfacial Phenomenon as per B Pharmacy PCI Pattern are: Who introduced the HLB concept and define HLB scale? Draw HLB scale with values of various surfactants along with examples. Enumerate various formulas for calculation HLB values. Explain RHLB (Required HLB). What are the various steps involved in detergency. Explain […]

Important Questions: Define surfactants. Define CMC (critical miscelleconcentration). Explain the mechanism of formation of micelles with diagram. Classify surfactants with suitable examples. Give medical applications of surfactants. Give pharmaceutical applications of surfactants. Explain how cationic amphiphiles posses antibacterial activity against gram negative organisms. Explain how amphiphiles above CMC decrease effectiveness of hexylresorcinol towards pinworms. Solutions:

Important Questions on Measurement of Surface & Interfacial Tension Physical Pharmacy Important Questions: Explain DuNouy Ring Method for determination of surface tension and interfacial tension. Give equation involved in this method. Explain Drop Weight and Drop Count Method for determination of surface tension. Explain Wilhelmy Plate Method for determination of Surface & Interfacial Tension. Explain

Physical Pharmacy Important Questions on Surface Free Energy & Measurement of Surface Tension – Interfacial phenomena Important Questions: Define Surface Free Energy. Derive an equation for determination of Surface Free Energy. ΔG = γΔA OR  W = γ x ΔA. Write applications of surface free energy equation in pharmacy? Deduce an equation to derive pressure difference across curved surface.