How to prepare colloidal silver through chemical reduction, I have a
0.355L / 0.1M silver nitrate solution (AgNO3) and sodium citrate tribasic dihydrate (C6H5Na3O7·2H2O)???
Pls help me
colloidal silver
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brownsunny148
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- Joined: Thu Mar 14, 2024 1:42 am
Re: colloidal silver
To prepare colloidal silver through chemical reduction using the given reagents, you'll need to follow these steps:
Prepare Silver Nitrate Solution:
Measure 0.355 liters of the 0.1 M silver nitrate (AgNO3) solution. This solution contains silver ions (Ag⁺) that will be reduced to form colloidal silver.
Prepare Sodium Citrate Solution:
Dissolve sodium citrate tribasic dihydrate (C6H5Na3O7·2H2O) in water to prepare a sodium citrate solution. The concentration of this solution will depend on the desired properties of the colloidal silver.
Combine Solutions:
Mix the silver nitrate solution with the sodium citrate solution in a suitable container. The ratio of silver nitrate to sodium citrate will influence the size and stability of the colloidal silver particles.
Reduce Silver Ions:
Add a reducing agent to the combined solution to reduce silver ions (Ag⁺) to elemental silver (Ag⁰). Common reducing agents used for this purpose include citric acid, glucose, or ascorbic acid (vitamin C).
Stir and Heat (Optional):
If necessary, stir the solution and heat it gently to facilitate the reduction process. Avoid boiling the solution, as excessive heat can affect the properties of the colloidal silver.
Prepare Silver Nitrate Solution:
Measure 0.355 liters of the 0.1 M silver nitrate (AgNO3) solution. This solution contains silver ions (Ag⁺) that will be reduced to form colloidal silver.
Prepare Sodium Citrate Solution:
Dissolve sodium citrate tribasic dihydrate (C6H5Na3O7·2H2O) in water to prepare a sodium citrate solution. The concentration of this solution will depend on the desired properties of the colloidal silver.
Combine Solutions:
Mix the silver nitrate solution with the sodium citrate solution in a suitable container. The ratio of silver nitrate to sodium citrate will influence the size and stability of the colloidal silver particles.
Reduce Silver Ions:
Add a reducing agent to the combined solution to reduce silver ions (Ag⁺) to elemental silver (Ag⁰). Common reducing agents used for this purpose include citric acid, glucose, or ascorbic acid (vitamin C).
Stir and Heat (Optional):
If necessary, stir the solution and heat it gently to facilitate the reduction process. Avoid boiling the solution, as excessive heat can affect the properties of the colloidal silver.
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volvemaster
- Newbie
- Posts: 1
- Joined: Fri Mar 22, 2024 12:37 am
Re: colloidal silver
A two-step reduction produces silver colloids with homogeneous shape and size. Small silver particles are formed by rapidly reducing silver nitrate with sodium citrate at 100°C and then growing at 92°C. Transmission electron microscopy, ultraviolet-visible absorption spectrophotometry, zeta-potential measurements, and Ag+ concentration analysis are used to characterize the chemical mechanisms and silver colloids that occur. The surface-enhanced Raman scattering (SERS) activity of silver colloids is next examined, with crystal violet (CV) serving as a SERS probe. The silver colloids are homogenous in shape and size, with consistent SERS activity. The silver particles have an average size of 47 nm (14% relative standard deviation), whereas the average sizes of silver colloids generated at 100°C and 92°C are 41 (30%) and 71 nm (33%), respectively.