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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

2.9K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

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The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Comparative Analysis of Commercial Colloidal Silver Products.

Ajeet Kumar1, Dan V Goia2

  • 1Ames Electronic Materials Division, South Plainfield, NJ 07080, USA.

International Journal of Nanomedicine
|December 30, 2020
PubMed
Summary

Many colloidal silver supplements contain only ionic silver, not silver nanoparticles as claimed. This misrepresentation by manufacturers impacts consumer understanding of efficacy and safety.

Keywords:
UV-Vis analysisantimicrobialbio-activecolloidal silvernanodispersionsupplement

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Analytical Chemistry

Background:

  • The COVID-19 pandemic spurred demand for supplements with antimicrobial properties.
  • Colloidal silver, with known antibacterial and antiviral effects, gained popularity.
  • The unregulated supplement industry lacks standards, hindering product quality assessment.

Purpose of the Study:

  • To scientifically evaluate commercial colloidal silver products sold online.
  • To assess the accuracy of manufacturer claims regarding silver nanoparticle content.

Main Methods:

  • Analyzed 14 popular colloidal silver products from Amazon.
  • Employed advanced analytical techniques: UV-Vis, Field Emission Scanning Electron Microscopy (FE-SEM), and Atomic Absorption Spectroscopy (AAS).
  • Investigated silver nanoparticle size, shape, and dispersion.

Main Results:

  • Silver concentrations in products generally matched manufacturer claims.
  • UV-Vis, FE-SEM, and STEM analyses indicated the absence of silver nanoparticles in most samples.
  • 70% of evaluated products contained only ionic silver, not silver nanoparticles.

Conclusions:

  • Significant misrepresentation exists, with many products labeled 'colloidal silver' lacking silver nanoparticles.
  • Ionic silver and silver nanoparticles differ substantially in action, efficacy, and safety.
  • This study establishes a scientific protocol for characterizing silver supplements and addresses consumer safety concerns.