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Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
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Liquid Spreading Induced by In Situ Generation of Metallic Nanoparticles.

Nitish Singh1, Yashaswini Jain1, Kaushal Kishore1

  • 1Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 5, 2020
PubMed
Summary

A novel depinning mechanism was discovered where in situ generated gold nanoparticles reduce liquid drop pinning on functionalized gels. This allows the drop to spread, controlled by salt concentration and substrate interactions.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Liquid drop spreading on solid substrates is governed by surface energy, substrate topography, and external forces.
  • Pinning effects often limit droplet dynamics, hindering controlled spreading.

Purpose of the Study:

  • To introduce a novel mechanism for liquid drop depinning and spreading.
  • To investigate the role of in situ generated species in overcoming pinning effects.

Main Methods:

  • Utilized fluoro-carbon (FC) functionalized agarose and pHEMA gels soaked with chloroauric acid as substrates.
  • Dispensed poly(dimethylsiloxane) (PDMS) drops containing a cross-linking agent onto the prepared substrates.
  • Varied salt concentration to observe effects on drop spreading diameter and contact angle.

Main Results:

  • Droplet spreading increased with rising salt concentration, accompanied by a decrease in contact angle.
  • The Si-H group in the cross-linking agent reduced the salt, triggering in situ gold nanoparticle generation.
  • Generated gold nanoparticles effectively mitigated the pinning effect, enabling enhanced drop spreading.

Conclusions:

  • In situ generation of gold nanoparticles provides a novel route to control liquid drop spreading by mitigating pinning.
  • The chemical reaction between droplet constituents and substrate-derived species offers a new paradigm for dynamic surface modification.