Good morning,
I am trying to make the synthesis of ZnO NP with chitosan, but in the end of the process, the sample become like a stone/rock, I cannot destroy to powder, even with a pestle and mortar… I made a lot of strength and nothing happen.
In my protol, I prepare a solution with 1% aqueus glacial acetic acid and 1g of chitosan. Then I put the percursor of zinc (zinc acetate or zinc nitrate). After that, I put NaOH until basic pH and stirring. Wash with water several times and put it overnight in the oven at 100ºC to dry.
Then, the sample became so strong that I can tranform it in powder.
Congratulations Ana!
Actually, there is a coordination chemistry behind the formation of this cross-linked metal coordinated (hexa-ligated) complex. This is possible when there is homogenous distribution of the Zinc oxide nanoparticles in the matrix of the chitosan. This composite may serve as substitute for many materials in electronics, water purification, energy storage, etc.
You may refer one of my highly cited publication on the similar composition. Article Preparation and Characterization of Self-photostabilizing UV...
Well, if you were able to produce nanoparticles, then you are making the typical mistake of many "nanotechnologists". Do not dry the nanosystem, it will end up fusing together as water is removed from the system. Do not dry nanoparticles.
use the electronic grinder for characterization which requires a solid form otherwise, you can use nanoparticles in suspension without drying
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