Shruthi K N

Thank you for the interesting question. Please provide more details as to 'Nano particles are used as synthesized'. What are the synthesis steps and how is the MgO stored? Is it in powder form or retained in (toluene) suspension? It is well known that MgO in the presence of moisture (e.g. storage in air) forms Mg(OH)2. This is hydrophilic and would have issues wetting in toluene. Further, if the material was in powder form then there are no free, independent, discrete particles < 100 nm present. In a powder there are tightly bound aggregates (not separable) and looser agglomerates (can be disrupted by sonication). See this webinar, for example (registration required):

Dispersion and nanotechnology

https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W190528DispNanoMat

Good luck with your research.

Dear Shruthi K N many thanks for posting this very interesting technical question. Blending of polymers with nanoparticles is certainly a hot research topic of significant current interest. In addition to the helpful advice given by Alan F Rawle please also have a look at the following relevant review article which might help you in your analysis. This review comprises 78 references to original research papers published in this field::

Recent Review on Poly-methyl methacrylate (PMMA)- Polystyrene (PS) Blend Doped with Nanoparticles For Modern Applications

Article Recent Review on Poly-methyl methacrylate (PMMA)- Polystyren...

Fortunately this review has been posted by the authors as public full text on RG, so that you can freely download it as pdf file.

Yet another potentially useful RG link is the following:

Fabrication of (Polymer Blend-magnesium Oxide) Nanoparticle and Studying their Optical Properties for Optoelectronic Applications

Article Fabrication of (Polymer Blend-magnesium Oxide) Nanoparticle ...

For a typical experimental procedure to make MgO nanoparticle-blended polystyrene please see e.g. this freely available reference:

The Effect of Magnesium Oxide Nanoparticles on Optical Properties of Polystyrene

Article The Effect of Magnesium Oxide Nanoparticles on Optical Prope...

In this case the authors use chloroform as solvent for preparing the polymer nanocomposite.

Good luck with your research and best wishes, Frank Edelmann

Alan F Rawle thank you sir.

prepared nano powder using co-precipitation method and stored in vacuum desiccator. As you suggested i will try again by heating the powder before sonication thank you very much for this explanation and answer

Frank T. Edelmann thank you sir for the literature. i will go through it.

Shruthi K N

We still have not heard how you have made your MgO - 'co-precipitation method' is insufficient. If you made your material (for example) by precipitation of Mg(OH)2 in aqueous media followed by calcination then your particles will be hydrophilic and will be hard to wet in non-aqueous media. You would need to prepare your material in non-aqueous media (and then the production of MgO is much more difficult). If in powder form then you'll have a material that contains no free, discrete, independent particles < 100 nm. You'll have a set of sub- and post-micron fused aggregates and looser agglomerates. Look at the webinar mentioned in my last answer (nearly a month ago....).

i prepared my using magnesium nitrate and NaOH . collected Mg(OH)2, and then calcinated to produce MgO.