Cmc Of a Surfactant

Experiment 7: Determining the CMC of a Surfactant by Contact Angle Measurements Introduction The aim of this experiment is to look into the circumstantial micelle preoccupation (CMC) of the resurrect-active agent through the measurement of the click tap of crepusculelets of surfactant resolving of different concentrations. The surfactant use in this experiment is Sodium Dodecylsulfate (SDS). Surfactants are usually amphiphilic  native compounds, consisting both hydrophobic  gatherings (their tails) and  deliquescent groups (their  laissez passers). When a surfactant is fade away 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 pattern 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 surfactan t molecules self-assemble into groups called micelle. The hydrophilic head of the surfactant molecules would be at the outer position 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 surface area of a solution, the take in required is proportionate to the amount of molecules at the surface of the fluidness, pursuance 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 st ress at the solid/ desiccation 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 bankers bill must be cypher at offset harmonise to the Young equation where ? is the equilibrium contact angle betwixt 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

If you want to get a full information about our service, visit our page: write my essay