We have the Mastersizer 3000 with a Hydro MV dispersion unit. My emulsion is with sunflower oil but I don't want to use it as a dispersant so i'm looking for an oil with similar properties. I tried mineral oil however I feel it is too viscous. When I empty the dispersion unit the oil still stays in the tubes and the measuring unit which makes it very difficult to clean between samples. Any ideas how to solve this? Thank you
Hi Naama,
I would stick to sunflower oil as dispersant. If you select another oil the water in your emulsion may start redistributing in case its solubility is higher. For emulsions it is wise to keep the continuous phase the same when diluting, esspecially or particle size analysis. One trick to clean your dispersing unit easier, is to check if you can use something like 'white spirit' to rinse. It mixes well with oils, is low viscous and generally pretty cheap and widely available. You may need to ask your Malvern representative if tubings and seals in your dispersing unit can withstand white spirit.
Kind regards, Leo
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