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Colloidal precipitates

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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[Ag25(SR)18](-): The "Golden" Silver Nanoparticle.

Chakra P Joshi¹, Megalamane S Bootharaju¹, Mohammad J Alhilaly¹

¹Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Research Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.

Journal of the American Chemical Society

|September 1, 2015

Summary

This summary is machine-generated.

Researchers synthesized a silver nanocluster, [Ag25(SR)18](-), structurally identical to its gold counterpart. This breakthrough enables direct comparison of silver and gold properties, addressing long-standing scientific questions.

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Area of Science:

Nanotechnology
Materials Science
Inorganic Chemistry

Background:

Silver and gold nanoparticles exhibit distinct properties but lack direct molecular analogues for comparative studies.
Understanding fundamental differences between silver and gold is crucial for applications in catalysis, optics, and medicine.

Purpose of the Study:

To synthesize and structurally characterize a silver nanocluster ([Ag25(SR)18](-)) that serves as a molecular analogue to a known gold nanocluster ([Au25(SR)18](-)).
To establish a nanoparticle platform for investigating the intrinsic differences between silver and gold.

Main Methods:

Synthesis of silver nanoparticles with precise molecular formula [Ag25(SR)18](-).
Single-crystal structure determination of the synthesized silver nanocluster.
Comparative analysis of structural, electronic, and optical properties with its gold analogue.

Main Results:

Successful synthesis and structural determination of [Ag25(SR)18](-), revealing identical metal atom count, ligand number, and atomic arrangement to [Au25(SR)18](-).
Observed similarities in optical absorption spectra between the silver and gold nanoclusters.
Established [Ag25(SR)18](-) as the first silver nanoparticle with a virtually identical gold analogue.

Conclusions:

The synthesized [Ag25(SR)18](-) nanocluster provides an unprecedented molecular analogue for gold nanoclusters.
This silver-gold nanoparticle system offers a unique platform to investigate fundamental differences in nobility, catalysis, and optical properties.
Opens new avenues for designing and understanding metal nanocluster behavior.