Senior Science

1. A wide range of cleaning products argon reconstruct from colloids and surfactants. * State the relationship between the properties of an photographic emulsion and the types of molecules present. Water-establish ( crude embrocate-in- peeing) emulsions, such as hand lotions, face cleansing lotions and conditioners, contain some oil or fat. They be used to moisturise or evaluate the skin and fuzz by placing oil onto the surface. They cod a lubricating effect and provide sheen. These atomic number 18 miscible with water. This means that if a wee amount is placed into water and shaken or stirred it will remain susp sacked. The types of surfactant molecules present in oil-in-water based emulsions are large molecules with very frozen chemic substance groups at one end. This end break downs attracted to the polar water molecules. The some other non-polar end of the surfactant is attracted to the non-polar oil molecules. Many of the surfactant molecules become positi oned around the very weensy droplets of oil, nixing them from merging together. | | Oil-based (water-in-oil) emulsions, such as cold creams, night creams and hair creams, contain some water. These are not miscible with water and so if a small amount is placed into water, the emulsion will not be maintained.

They are useful to neaten the skin, moisturise very juiceless skin and hold hair in place, but are greasy and sticky to the touch. The types of surfactant molecules present in water-in-oil based emulsions are long starch molecules or protein chains. The chains bakshish among minute water droplets and prevent them from merging together. | | * Outline the excogitation of the emulsifying agent in a range of consumer! cleaning products. The molecules in emulsifying agents that are used in dishwashing and laundry detergents (anionic) have a negative end when they dissolve. This allows them to keep oily substances by from any article that has negatively charged surfaces, such as glass and crockery. The molecules in emulsifying agents that are used in fabric softeners...If you want to get a full essay, order it on our website: OrderEssay.net

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