Please suggest me how to do DLS study of CoFe2O4 nano-particles synthesized by co-precipitation method for their size distribution (a good reference is also OK).
Kindly check the below links.....
http://www.academia.edu/2550346/Biocompatibility_Studies_of_Functionalized_CoFe2O4_Magnetic_Nanoparticles
http://www.nanoscalereslett.com/content/pdf/1556-276X-8-376.pdf
http://www.scientificbulletin.upb.ro/rev_docs_arhiva/full6255.pdf
Also , i was bit confused by your question , are you asking the operation procedure for handling DLS instrument for your sample OR is this about the sample analysis method ..... in case of co-precipitation , the sample will be in suspended solids [ say micro to nano range ] ..... simple suggestion is dilute the sample as much possible until the settling of your particles in not visible for naked eyes [ or even you can check simple by use a laser by Tyndall effect ] agglomeration might affect the sample's original size and results in larger particle size DLS output. For your reference i have attached a video https://www.youtube.com/watch?v=1FYtjUa097s , check the video .. you have to dilute your sample as shown in this video.. .. all the best.
You should prepare a good suspension of your nanoparticle through high dilutions. Then you will get DLS results accurately.
For DLS measurement, you should first prepare a solution of your nanoparticles. Then vortex the solution very well and centrifuge for a while, to remove big particles/or aggregates. The solution should not be very concentrated.
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