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Related Concept Videos

Metallic Solids02:37

Metallic Solids

16.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
16.4K
The Colloidal State01:29

The Colloidal State

179
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...
179
Colloidal precipitates01:09

Colloidal precipitates

5.7K
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...
5.7K
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

5.7K
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
5.7K
Colloids03:22

Colloids

17.1K
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...
17.1K
Precipitation Gravimetry01:03

Precipitation Gravimetry

12.6K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Related Experiment Video

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Gold Nanoparticle Synthesis
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Gold Nanoparticle Synthesis

Published on: July 10, 2021

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Gold metal liquid-like droplets.

Evgeny Smirnov1, Micheál D Scanlon, Dmitry Momotenko

  • 1Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne , Station 6, CH-1015 Lausanne, Switzerland.

ACS Nano
|September 4, 2014
PubMed
Summary

Researchers developed a simple, one-step method to create reflective, stable gold nanoparticle films around liquid droplets. These novel gold metal liquid-like droplets (MeLLDs) offer a robust solution for advanced material applications.

Keywords:
gold nanoparticlesliquid mirrorliquid−liquid interfaceoptical filterself-assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Developing simple, robust methods for nanoparticle coatings on macroscopic objects is challenging.
  • Existing techniques often lack the ability to create continuous, thick, and stable multilayer films.

Purpose of the Study:

  • To introduce a facile and rapid one-step method for creating reflective, liquid-like gold nanoparticle films.
  • To demonstrate the formation of stable, multilayer gold nanoparticle coatings on macroscopic droplets.

Main Methods:

  • Utilizing the self-assembly of gold nanoparticles at liquid-liquid interfaces during emulsification.
  • Employing redox-active molecules, specifically tetrathiafulvalene, to displace stabilizing ligands and act as a molecular glue.
  • Leveraging electrochemical reactions and electrostatic interactions between gold nanoparticles and tetrathiafulvalene radical cations.

Main Results:

  • Successfully formed gold metal liquid-like droplets (MeLLDs) by coating macroscopic droplets with continuous, reflective gold films.
  • Demonstrated that the MeLLDs are reversibly deformable and kinetically stable for over a year.
  • Established a methodology based on heterogeneous interactions and electrochemical reactions.

Conclusions:

  • The developed method provides a simple, rapid, and robust route to create advanced gold nanoparticle coatings.
  • Gold MeLLDs exhibit unique properties including deformability and long-term stability.
  • This approach opens new avenues for applications requiring stable, reflective nanoparticle films.