Products

Silver Colloids & Nanoparticles

PELCO® NanoXact™ and BioPure™

Silver Colloids & Nanoparticles

Citrate stabilized silver nanoparticles have a surface that is readily displaced by other biomolecules or polymers and is the capping agent of choice when using physisorption (noncovalent interactions such as van der Waals forces) to further modify the nanoparticle surface. Citrate capped colloidal silver particles are suspended in 2mM citrate buffer, pH 7.4.

NOTE: Thiols and amines have a high affinity for the silver surface. Functionalizing silver is difficult because thiols and amines bind strongly to the silver surface. However, the silver bonds are labile and can rearrange, reducing long term stability. To avoid destabilizing try to use bidentate or tridentate molecules (i.e. those that present multiple thiols or amines to the silver surface).

 

Nanoparticles Developed for Ted Pella, Inc.

The PELCO® NanoXact™ and BioPure™ colloidal silver nanoparticles are extensively characterized (see Technical Data below) and designed to meet the rigorous research demands in today’s market. They range in size from 20 to 100nm.

The silver colloids come with comprehensive specification sheets that provide all of the physical and optical characterization data necessary to integrate the nanoparticles into Surface Enhanced Raman Spectroscopy (SERS), plasmonic and photonic applications.

 

Product Description

 

Stability and Storage

The PELCO® NanoXact™ and BioPure™ silver colloids should be stored at 4°C in the dark. The silver colloids are photosensitive.

Product testing indicates increased stability can be attained by following the storage recommendations.



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PELCO NanoXact
PELCO NanoXact Silver Colloids/Nanoparticles – Supplied at 1X Concentration in 2mM citrate buffer, pH 7.4

no. 84060-20 to 84080-100

Description

1X Concentration
NanoXact Ag Technical Data
Particle
Diameter		 Ag Mass
Concentration 		Atomic Molarity
(Ag) 		Particle
Concentration 		Ag
Mass Percent 		Max
Optical Density 		Peak
Wave-length
(mg/mL) 0.005 (mmol/L) (particles/mL) (%) (cm-1) nm
20 0.02 0.185 4.50 x 1011 0.002 2.46 405
30 0.02 0.185 1.30 x 1011 0.002 2.49 405
40 0.02 0.185 5.70 x 1010 0.002 2.54 410
50 0.02 0.185 2.90 x 1010 0.002 2.39 420
60 0.02 0.185 1.70 x 1010 0.002 2.03 435
70 0.02 0.185 1.10 x 1010 0.002 1.74 440
80 0.02 0.185 7.10 x 109 0.002 1.34 450
100 0.02 0.185 3.60 x 109 0.002 0.89 500

 

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BioPure Silver Colloids/Nanoparticles, Citrate Capped Silver Colloids
PELCO BioPure Silver Colloids/Nanoparticles – Supplied at 50X Concentration in 2mM citrate buffer, pH 7.4

no. 85010-20 to 85030-100

Description

50X Concentration
Biopure Ag Technical Data
Particle Diameter Ag Mass Concentration Atomic Molarity Ag Particle Concentration Ag Mass Percent Max Optical Density Peak Wave Lenght
(mg/mL) 0.005 (mmol/L) (particles/mL) (%) (cm-1) nm
20 1.0 9.25 2.25 x 1013 0.01 123 405
30 1.0 9.25 6.50 x 1012 0.01 125 405
40 1.0 9.25 2.85 x 1012 0.01 127 410
50 1.0 9.25 1.45 x 1012 0.01 120 420
60 1.0 9.25 8.50 x 1011 0.01 101 435
70 1.0 9.25 5.50 x 1011 0.01 87 440
80 1.0 9.25 3.55 x 1011 0.01 67 450
100 1.0 9.25 1.80 x 1011 0.01 45 500

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