For example, if we observe the UV-Vis spectrum of the polymer stabilized nanoparticles, Do we get 2 different peaks for nanoparticles and polymer or a shift in the particle's peak or else what should we get and how to interpret?
You can check the particle size and zeta potential in different time intervals....that will give a clear focus on whats happening to the particulates and its stability behaviour. for the same samples you can observe UV readings.....but i dont know how much relevant it is to predict the stabilty, if it starts to aggregate.
ok. thank you Mr.Venkatachalam. i ll try zeta potential. but i have taken uv readings which shows a red shift but dint find a prominent peak for polymer... i am not sure of what to interpret from this.
Assuming you are using metallic nanoparticles such as gold or silver, your UV-vis peak is due to its surface plasmon resonance. A redshift in this peak when trying to stabilize with polymers means that the polymers are present at the surface of the particles, thus increasing the local dielectric constant near the surface of the particles; this shift in dielectric constant causes a redshift in the plasmon resonance. In this way you can use an observed redshift to confirm that your polymers are adsorbing or binding to the surface of the nanoparticle.
Alternatively, the aggregation of metallic nanoparticles could also cause a redshift, but would also be accompanied by significant broadening and weaker intensity.
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