I am planning to study the antimicrobial properties of glass coated with silver nanoparticles. I would like to do it with dip coating. Can anyone help with their expertise?
To deposit an even layer of nanoparticle I suggest using the Marangoi flow to your advantage, this maintains a constant flow of particles inside a droplet of solution. Essentially this prevents a drying solution from giving you the Coffee Stain effect. I now incorporate this for most of the reactions that require an even layer of material on a substrate. See this paper that I worked on as an example: Overcoming the "coffee-stain" effect by compositional Marangoni-flow-assisted drop-drying. The practice is very simple, you put a droplet of your solution on a surface and then place it in an environment where a liquid having a lower surface tension is already vaporized, this can be done on a hotplate, or at room temp, depending on the liquid properties.
thank you Alvin, I will read the paper and see how I can try this for silver nanoparticles. Quick question, they need to be PVP coated?
That should not matter that they are PVP coated, or not. But if they are not coated with a surfactant they have a tendency to stick together, this can mess up the process of making an even layer. But I bet it is possible even if they are not PVP coated, just play around with the concentrations, if they are not coated, I would start with more dilute concentrations.
One interesting way to coat silver nano particle on the substrate is the usage of dopamine coaitng. Dopamine could be formed easily on ant substrate and make a nano meter thickness layer, the dopamine coated substrate could be immersed in silver nitrate solution. Since dopamine can reduce the silver nitrate to silver nano particle, this could for a silver nano particle on the substrate.
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