I wanted to diposite a polymer on nanoparticles,but the TEM results shows that that the polymer diposite on an aggregated nanopartilces together. is that a problem of the nanoparticles dispertion before reaction? and what is the appropriate nanoparticles concentration to have a good TEM images?
Dear Rahoui Nahla,
if you give more details on your nanopaticles (which particles, synthesis) it is possible to answer your last question. Two first questions are unclear. May be you can provide some TEM images with comments what you did and what you want to do.
Nano-particles have a tendency to agglomerate, if they are not dispersed well. Thus, use an ultrasonic bath to disperse the particles thoroughly. The reaction must be carried out immediately after dispersion.
It is difficult to figure out the issue without knowing the nature of your nanoparticles (charged or not) and polymer (neutral polymer or polyelectrolytes).
It is difficult to figure out the issue without knowing the nature of your nanoparticles (charged or not) and neutral polymer.
You have the possibility to modify the surface of the nanoparticles? So that that have greater affinity for your polymer.
As Dario said, I also agree with that. This can be done by pre treating nano-particles, so the surface gets 'etched', I don't know about your case in particular. But we have used several acids to etch nano particles of rare earth metals. Once particles get etched they can stick to polymer as well. In our case we wanted to stick nano particles on carbon fiber. Kindly go through our review article on nano-grease.
https://www.researchgate.net/publication/309001926_A_review_on_graphite_and_hybrid_nano-materials_as_lubricant_additives
It might not be the best for your case, but will still give you some idea about the behaviour of such particles.
Article A review on graphite and hybrid nano-materials as lubricant additives
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