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Related Concept Videos

Colloids03:22

Colloids

21.1K
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...
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Colloids and Suspensions01:17

Colloids and Suspensions

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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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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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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Molar Mass01:54

Molar Mass

86.9K
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties.
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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

101.8K
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Physical and Chemical Properties of Matter02:57

Physical and Chemical Properties of Matter

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The characteristics that enable us to distinguish one substance from another are called properties.
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Updated: Feb 4, 2026

Gold Nanoparticle Synthesis
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Published on: July 10, 2021

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Colloidal porous gold nanoparticles.

Jinhui Hu1, Ruibin Jiang, Han Zhang

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, China. rbjiang@snnu.edu.cn.

Nanoscale
|October 3, 2018
PubMed
Summary

Researchers developed a new ambient wet-chemistry method to create porous gold nanoparticles. These gold nanostructures show high surface-enhanced Raman scattering (SERS) and catalytic activity for various applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Porous gold (Au) nanostructures are crucial for catalysis, sensing, and surface-enhanced Raman scattering (SERS).
  • Traditional synthesis methods involve high-temperature dealloying and harsh chemical etching.
  • Developing simpler, more efficient synthesis routes is essential.

Purpose of the Study:

  • To report an ambient wet-chemistry method for synthesizing colloidal porous gold nanoparticles.
  • To evaluate the SERS enhancement factor and catalytic activity of the synthesized porous Au nanoparticles.
  • To offer an alternative to conventional synthesis methods.

Main Methods:

  • Growth of gold (Au) on lead sulfide (PbS) nanocrystals.
  • Simultaneous etching of PbS by the growth solution at ambient conditions.
  • Characterization of porous Au nanoparticle properties.

Main Results:

  • Successfully synthesized colloidal porous Au nanoparticles using an ambient wet-chemistry approach.
  • Achieved a high SERS enhancement factor of (1.23 ± 0.10) × 10^7 on individual particles.
  • Demonstrated catalytic activity significantly higher than previously reported porous Au materials.

Conclusions:

  • The novel ambient wet-chemistry method provides an efficient route to porous Au nanoparticles.
  • The synthesized porous Au nanoparticles exhibit excellent SERS and catalytic performance.
  • This advancement has significant implications for SERS-based applications and gold catalysis.