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730785

Sigma-Aldrich

Silver, dispersion

nanoparticles, 10 nm particle size (TEM), 0.02 mg/mL in aqueous buffer, contains sodium citrate as stabilizer

Synonym(s):

Colloidal silver

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About This Item

Linear Formula:
Ag
CAS Number:
7440-22-4
Molecular Weight:
107.87
MDL number:
MFCD00003397
UNSPSC Code:
12352302
PubChem Substance ID:
329764594
NACRES:
NA.23
Pricing and availability is not currently available.

form

nanoparticles

contains

sodium citrate as stabilizer

concentration

0.02 mg/mL in aqueous buffer

refractive index

n20/D 1.333

particle size

10 nm (TEM)

density

0.997 g/mL at 25 °C

fluorescence

λem 388 nm FWHM 59 nm

storage temp.

2-8°C

SMILES string

[Ag]

InChI

1S/Ag

InChI key

BQCADISMDOOEFD-UHFFFAOYSA-N

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General description

Our silver nanoparticles (10 nm in diameter) are spherical nanoparticles of metallic silver dispersed in an aqueous buffer. The particles have high electronic conductivity, high surface area, and, because of their tightly controlled particle size, fluoresce at 388 nm with a FWHM of only 50 nm.

Application

AgNPs dispersion can be used for a variety of applications such as optoelectronics, energy harvesting, and surface enhanced Raman spectroscopy (SERS).[1]

Pictograms

Environment
GHS09

Signal Word

Warning

Hazard Statements

H410

Precautionary Statements

P273 - P391 - P501

Hazard Classifications

Aquatic Acute 1 - Aquatic Chronic 1

Storage Class Code

12 - Non Combustible Liquids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
MKCX2381
MKCT9115
MKCW1299
MKCS5195
MKCN0590

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Charlene Andraos et al.
International journal of toxicology, 39(5), 397-421 (2020-07-17)
Despite several studies addressing nanoparticle (NP) interference with conventional toxicity assay systems, it appears that researchers still rely heavily on these assays, particularly for high-throughput screening (HTS) applications in order to generate "big" data for predictive toxicity approaches. Moreover, researchers
Plasmonic effects of quantum size metal nanoparticles on Synthesis of highly monodisperse citrate-stabilized silver nanoparticles of up to 200 nm: kinetic control and catalytic properties
Bastus NG, et al.
Chemistry of Materials, 7(6), 2069-2083 (2017)
Synthesis and characterization of stable aqueous dispersions of silver nanoparticles through the Tollens process
Yin Y, et al.
Journal of Materials Chemistry, 12(3), 522-527 (2002)
Direct synthesis of narrowly dispersed silver nanoparticles using a single-source precursor
Lin X, et al.
Langmuir, 19(24), 10081-10085 (2003)
Direct synthesis of narrowly dispersed silver nanoparticles using a single-source precursor
Lin XZ, et al.
Langmuir, 19(24), 10081-10085 (2003)
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Questions

1–5 of 5 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

      Helpful?

  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Helpful?

  3. it can able to scatter light when it absorbs particular wavelength of light?

    1 answer

    1. Yes, this item is a silver dispersion. Silver nanoparticles do scatter light. The product specification range is 380-405 nm. As reported in the Properties section, the fluorescence λem is 388 nm with the FWHM at 59 nm and a refractive index of n20/D 1.333.

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  4. Hi, I see that this silver colloidal is water based, but I could not find the information of which materials it is soluble. For example, is it soluble in chloroform or DMSO?

    1 answer

    1. The product is a dispersion of silver nanoparticles in an aqueous buffer. Aqueous dispersants appear to be the the standard format. Please check the literature for further diluting in organic solvents or DMSO:

      https://www.sigmaaldrich.com/search/730785?focus=papers&page=1&perpage=30&sort=relevance&term=730785&type=citation_search
      https://www.sigmaaldrich.com/search/730785aldrich?facet=facet_content_type%3ATechnical%20Article&focus=sitecontent&page=1&perpage=30&sort=relevance&term=730785aldrich&type=site_content

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  5. sulla descrizione del prodotto è indicato che sono sospese in buffer acquoso. Di quale buffer si tratta? e a che pH sono? grazie

    1 answer

    1. The buffer used for product 730785 is a 2mM sodium citrate buffer. The pH of the solution is 6.9.

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