I did an experiment of making functionalized graphene oxide and dried it in a vacuum oven, and ground f-GO using mortar and pestle.
After that, I will make two types of nanocomposites (Polymer/GO & Polymer/f-GO) and
compare the properties of two composites. (TGA, DSC, DMA,etc.)
My question is, no matter how much I reduce the particle size of f-GO by using mortar and pestle, it is still larger than that of GO.
If I make Polymer/GO 0.1wt% and Polymer/f-GO 0.1wt%, is it okay to compare their properties at the same concentration although GO and f-GO have different particle sizes?
I need your advice.
Thank you :)
Your perspective should be to identify whether fiunctionalized graphene is better for a given application or nonfunctionalized one on characterization. Characterization of both is a must to know their suitability for host of applications. However functionalized one will be selective in its action as against nonfunctionalized one.
Dear J. Heo
As I knew, you couldn't chop one of your samples. So you want to compare 1%wt of each. It is important to consider :
1- size variation is a problem in your results. Especially in TGA, you can not ignore particle size variation. ( I see some papers which explain: " the difference is because of variation in particle size" but it is not scientific.)
2- Studying the properties of f-GO and GO are important, So you should chop the particles of GO less using mortar, or you can use planetary ball mill for your samples to chop better.
Jw Heo
You can always compare concentrations. But for what purpose? If you want to determine the effect of functionalization on the physicomechanical properties of a composite, then you must have 1% GO and 1% GO +% functionalizing substances in two composites. Dimensions GO must be the same.
firstly, you should not dry and ground the graphene because it has a great possibility to aggregate and to form graphite particles at microsize level, so you can use the in-solution process to disperse and distribute the graphene inside de polymer matrix and then you can use tensile testing to compare the impact of the functionalization on the mechanical properties of the composites
Article Influence of graphene oxide and graphene nanosheet on the pr...
Chapter Functionalized Graphene and Thermoset Matrices–Based Nanocomposites
Yes, you can off course compare the concentration. But please check the motivations behind doing that, it may vary case to case.
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