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Here are some guidelines for using gelatin to make/cap silver nanoparticles:
An electronic scale, a heated stir plate, and chemical thermometer are recommended.
How much to use: (based on results with 320 ppm silver batches using Knox brand unflavored gelatin):
Calculate minimum mg of gelatin = ppm X ml /160
Calculate maximum mg of gelatin = ppm X ml /80
This amount will give good results. Other members report success with less. The amount is for Knox brand unflavored gelatin. Other brands may require a different amount.
For 20 to 40 ppm, add the gelatin after the electrolysis. For ppm > 40, add the gelatin at the start.
Add the gelatin to the water when cold and let it sit (bloom) for several minutes, then heat it to 60C until the gelatin dissolves, then start the electrolysis for ppm > 40, or just allow to cool if the electrolysis is finished.
For making high ppm (greater than 40 ppm) the gelatin should be in the water during the electrolysis.
- Always add the gelatin to cold distilled water by sprinkling the powder on top so that there are no clumps.
- Let the gelatin soak for 5 minutes or longer to absorb water before applying heat.
- Apply stirring if you have a stirring device.
- Apply heat so the mixture warms up slowly, allowing all the gelatin to dissolve. 60C (140F) is sufficient.
- Keep the temperature of the solution above 140F/60C minimum to 190F/88C. Avoid boiling to prevent excess evaporation.
- Use the appropriate amount of reducing agent (based on water volume and ppm) IE: 4 to 5 drops diluted corn syrup for 1 cup of 320 ppm colloidal silver (ppm*milliliters/16000).
- Use the appropriate amount of electrolyte (based only on water volume at 20 drops 1M sodium carbonate per liter) IE: 4 to 5 drops for 1 cup of 320 ppm colloidal silver
- Reduction is much slower with gelatin in the water, so the solution must be kept warm for some time after the electrolysis is complete for the color change to occur indicating full reduction.
- Gelatin capped colloidal silver will be darker in color due to the weight of the gelatin dragging on the surface electrons of the particles.
Alternate Method for 20 and 40 ppm colloidal silver:Make gelatin solution by dissolving 1 gram of gelatin in 250ml of water or 20 ppm colloidal silver, and heat until dissolved.
Add an appropriate amount of this solution (try 1 teaspoon for each 250ml/cup of warm (140F) colloidal silver and allow to stand and cool for at least an hour.
These guides are based on experiments by Kephra and RickinWI and are suggested as a starting point, and may not be optimum. However following these guides will result in quality colloidal silver nanoparticles.
Store unused gelatin in the refrigerator, and replace frequently to avoid spoilage.