5/26/2023 0 Comments Liquid notes![]() Write about first tensiometer developed and used to determine surface tension.ġ0. What is effect of surfactant concentration and solute on surface tension of liquids?ĩ. Why drop of liquid hanging in air is spherical in shape?Ĩ. Describe drop method to determine surface tension of liquid.ħ. Describe capillary rise method for determination of surface tension of liquids.Ħ. Enlist methods to determine surface tension of liquids and solids.ĥ. Explain the terms surface excess and surface pressure.Ĥ. What are units of surface tension and interfacial tension?ģ. What are surface, interface and surface?Ģ. Differentiate between different types of mono-layers and recognize basic methods for their characterization.ġ.Understand the mechanisms of adsorption on liquid and solid interfaces.Understand the concept of surface and interface tensions, surface free energy, its changes, work of cohesion and adhesion, and spreading and methods of their measurements.Understand the terms surface tension and interfacial tension and their application in pharmaceutical sciences.Understand types of interfaces and describe relevant examples.For example, solubilization and dispersion of drugs, suspension or emulsion stability, and adsorption of drugs on different substrates are all affected by the interfacial properties of drugs and their environment.Īfter studying the contents of the chapter, students are expected to: Interfacial phenomena affect drug delivery systems. Molecules at boundaries between two immiscible phases is different from their behavior in the bulk of the phases, which has implications for the physiology of the human body as well as for pharmacy. Surface tension of water is an important property in situations where small volumes of liquid occur, or the liquid is in contact with small diameter tubes or porous media. Surface tension occurs whenever there is an interface between a liquid, a solid or a gas. Liquid interface, surface & interfacial tensions,surface free energy, measurement of surface & interfacial tensions, spreading coefficient, adsorption at liquid interfaces, surface active agents, HLB Scale, solubilisation, detergency, adsorption at solid interface.
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