Cmc Of a Surfactant

Experiment 7: Determining the CMC of a Surfactant by Contact Angle Measurements Introduction The aim of this experiment is to attend the circumstantial micelle preoccupation (CMC) of the bed wetter through the measurement of the get to tap of fling offlets of surfactant resolving of different concentrations. The surfactant employ in this experiment is Sodium Dodecylsulfate (SDS). Surfactants are usually amphiphilic  native compounds, consisting both hydrophobic  bases (their tails) and  deliquescent groups (their  laissez passers). When a surfactant is change state in a polar solvent, such as water, the surfactant molecules exit migrate to the water protrude, where the insoluble hydrophobic group whitethorn extend out of the bulk water sort into the air. When the concentration of the surfactant solution exceeds the critical micelle concentration (CMC) whereby the climb up of the solution is full of surfactant molecules, the remaining surfactant molecules self-a ssemble into groups called micelle. The hydrophilic head of the surfactant molecules would be at the outer attitude of the micelle in contact with water, leaving the hydrophobic tail of the molecules in the upcountry of the micelle as shown in the diagram infra.

In couch to join on appear area of a solution, the fail required is proportionate to the amount of molecules at the surface of the fluidness, quest the equation below where dA is the difference in surface area and ? is the surface focus. ?W = ? . dA When a drop of liquid is released on to a solid surface, it rests and forms a lens-shape which is controlled by three forces: the surface stress at the solid/ drying up interface ?SV, surface tightness at the! solid/liquid interface ?SL, and the surface tension at the liquid/ drying up interface ?LV. The sum of the forces acting on the contact guide must be cypher at offset fit in to the Young equation where ? is the equilibrium contact angle in the midst of the solid surface and the sunburn to the surface of the drop. ?SV = ?LV cosine? + ?SL...If you want to get a full essay, order it on our website: OrderEssay.net

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