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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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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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Published on: October 4, 2012

Supercontinuum generation in aqueous colloids containing silver nanoparticles.

R Driben1, A Husakou, J Herrmann

  • 1Max-Born-Institut for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany.

Optics Letters
|October 14, 2009
PubMed
Summary
This summary is machine-generated.

We numerically study low-threshold supercontinuum generation in silver nanoparticle colloids. This approach enhances nonlinearity, enabling octave-spanning spectral broadening with femtosecond pulses.

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Last Updated: Jun 19, 2026

Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
12:47

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

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Area of Science:

  • Nonlinear optics
  • Materials science
  • Nanophotonics

Background:

  • Supercontinuum generation is crucial for various optical applications.
  • Enhancing material nonlinearity is key to achieving low-threshold supercontinuum generation.
  • Aqueous colloids with metal nanoparticles offer unique optical properties.

Purpose of the Study:

  • To numerically investigate low-threshold supercontinuum generation.
  • To explore the role of enhanced nonlinearity in silver nanoparticle colloids.
  • To predict spectral broadening characteristics and influencing factors.

Main Methods:

  • Numerical simulations of nonlinear optical effects.
  • Modeling of femtosecond pulse propagation in composite media.
  • Analysis of the frequency-dependent nonlinear coefficient.

Main Results:

  • Predicted octave-spanning spectral broadening.
  • Achieved low threshold (tens of GW/cm2) using enhanced nonlinearity.
  • Observed significant influence of nonlinear coefficient on spectral broadening and blueshift.

Conclusions:

  • Aqueous colloids with silver nanoparticles enable efficient low-threshold supercontinuum generation.
  • The frequency-dependent nonlinearity significantly impacts spectral broadening via self-phase modulation.
  • This method leads to substantial spectral blueshifting.