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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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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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Color Transferability from Solution to Solid Using Silica Coated Silver Nanoparticles.

Julia Danischewski1, Destiny Donelson1, Maleeha Farzansyed1

  • 1Chemistry Department, Skidmore College, Saratoga Springs, New York12866-1632, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 26, 2023
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Summary
This summary is machine-generated.

Intrinsic color changes in nanoparticle-polymer composites can mislead sensor interpretations. This study reveals how silica shell thickness on silver nanoparticles affects color shifts, crucial for accurate plasmonic sensor design.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Interpreting color changes in sensors is vital for accurate results.
  • Intrinsic color variations in nanocomposites can lead to erroneous conclusions.
  • Understanding these intrinsic changes is key to developing reliable plasmonic sensors.

Purpose of the Study:

  • To investigate the intrinsic color changes during nanoparticle embedding in polymers.
  • To develop a safer and faster method for coating silver nanoparticles with silica.
  • To identify critical factors influencing the synthesis of silica-coated silver nanoparticles.

Main Methods:

  • Developed a novel, safer, and faster silica coating method for silver nanoparticles.
  • Utilized a seven-factor Plackett-Burman design to optimize synthesis parameters.
  • Characterized silver nanodisks with varying silica shell thicknesses.

Main Results:

  • Increasing silica shell thickness reduced the sensitivity of localized surface plasmon resonance (LSPR) to refractive index changes.
  • A significant color shift (up to 72 nm) was observed for bare nanoparticles embedded in poly(vinyl alcohol).
  • No perceptible color change occurred when nanoparticles were coated with a 25-nm silica shell.

Conclusions:

  • The intrinsic color changes in polymeric nanocomposites are directly related to nanoparticle surface modifications.
  • Silica shell coating effectively mitigates LSPR-based color shifts, impacting sensor performance.
  • Understanding these preparation-induced color origins is essential for designing and correctly utilizing plasmonic sensors.