Nanometer-sized gold and silver particles of uniform shape and size are invaluable
tools in nanotechnology (assembled arrays), light scattering (elastic - plasmon resonance;
inelastic - Raman effect) and for single molecule detection. Gold nanoparticles
can be attached to proteins, alkanethiols and DNA by various methods. Silver
nanoparticles are evolving similar functional characteristics to their gold counterparts.
Ted Pella, Inc. is the leader in offering a wide range of both silver and gold
nanoparticles for these applications. Talk to our applications engineer to find out
about the new developments/applications. We are constantly developing new gold
and silver colloids for new nanotechnology applications.
The nanometer sized gold colloids can be characterized as follows:
- Monodispersed gold nanoparticles supplied in water, having trace amounts of citrate,
tannic acid and potassium carbonate
- Citrate stabilized with a net negative surface charge (Langmuir 2005, 21:9303-9307)
- Gold colloid pH's range from above 5 for 5nm gold to less than 9 for the larger sized
particles (pH increases with size).
- Available in a size range from 2 to 250nm
- The particles are invaluable tools for light scattering, either Raman or plasmon
resonance (Analytical Chemistry 1999, 71:4903-4908; Analytical BioChemistry 1998, 262:137-156)
The 2nmn colloid is too small to scatter light and the solution is clear.
The remaining sizes scatter light to different degrees and the solution color
changes with increasing particle size.
The silver colloids are a newer offering and have not been characterized as well as the gold colloids.
They are supplied in water, have a negative surface charge and are available in 4 sizes from 20 to 80nm.
The smaller colloids are (20 and 40nm) are yellow in color and the larger sizes (60 and 80nm) are a light gray.
These products are known to be stable for a minimum of one year after opening.
To avoid contamination after opening, it is best to handle the product under clean room conditions
to avoid contamination by dust or other airborne contaminants. Temperatures for storage, after opening, can vary from
4-8°C (39-46°F) to room temperature depending on whether the application is diagnostic or
research oriented. The colloid is stable on boiling and destroyed by freezing.
When storing the product below 8°C (46°F) it is the customer's responsibility to ensure that
their refrigerator can maintain a constant temperature in the
range noted above.
NOTE: To best insure product quality, all shipments of unconjugated gold and
silver colloids are sent for next day delivery.
No Friday (weekend) shipments.
Gold Colloids (Sols)
MSDS Material Safety Data Sheet for Unconjugated Gold Sols
| Size (nm) | Particles/ml | | 20 ml | Price $55.80/ea | | 100 ml | Price $225.00/ea | | 500 ml | Price $742.50/ea |
|---|
| 2nm | 1.5 x 1014 | | |
| | |
| | |
|
|---|
| 5nm | 5.0 x 1013 | | |
| | |
| | |
|
|---|
| 10nm | 5.7 x 1012 | | |
| | |
| | |
|
|---|
| 15nm | 1.4 x 1012 | | |
| | |
| | |
|
|---|
| 20nm | 7.0 x 1011 | | |
| | |
| | |
|
|---|
| 30nm | 2.0 x 1011 | | |
| | |
| | |
|
|---|
| 40nm | 9.0 x 1010 | | |
| | |
| | |
|
|---|
| 50nm | 4.5 x 1010 | | |
| | |
| | |
|
|---|
| 60nm | 2.6 x 1010 | | |
| | |
| | |
|
|---|
| 80nm | 1.1 x 1010 | | |
| | |
| | |
|
|---|
| 100nm | 5.6 x 109 | | |
| | |
| | |
|
|---|
| 150nm | 1.7 x 109 | | |
| | |
| | |
|
|---|
| 200nm | 7.0 x 108 | | |
| | |
| | |
|
|---|
| 250nm | 3.6 x 108 | | |
| | |
| | |
|
|---|
Silver Colloids (Sols)
MSDS Material Safety Data Sheet for Silver Colloids
| Size (nm) | Particles/ml | | 20 ml | Price $55.80/ea | | 100 ml | Price 225.00/ea | | 500 ml | Price 742.50/ea |
|---|
| 20nm | 7.0 x 1010 | | |
| | |
| | |
|
|---|
| 40nm | 9.0 x 109 | | |
| | |
| | |
|
|---|
| 60nm | 2.6 x 109 | | |
| | |
| | |
|
|---|
| 80nm | 1.1 x 109 | | |
| | |
| | |
|
|---|
