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Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
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Metallic Bond-Enabled Wetting Behavior at the Liquid Ga/CuGa2 Interfaces.

Yuntao Cui, Fei Liang, Zhenze Yang1

  • 1School of Future Technology , University of Chinese Academy of Sciences , Beijing 100049 , China.

ACS Applied Materials & Interfaces
|March 7, 2018
PubMed
Summary

Gallium-based liquid metal rapidly wets CuGa2 surfaces due to strong metallic bonding. This study establishes a model explaining this wetting behavior, crucial for understanding liquid metal-interface interactions.

Keywords:
density functional theoryfirst-principlesgallium-based liquid metalintermetallic compoundmetallic bond wetting force

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Area of Science:

  • Materials Science
  • Surface Science
  • Physical Chemistry

Background:

  • Interface interactions significantly influence material properties like contact angle and adsorption.
  • Wetting phenomena at liquid metal (LM) and intermetallic interfaces are not fully understood.

Purpose of the Study:

  • To investigate the wetting behavior of gallium-based liquid metals on CuGa2 surfaces.
  • To elucidate the underlying mechanism of rapid spreading and puddle formation.
  • To quantitatively evaluate interface forces using a theoretical model.

Main Methods:

  • Density functional theory (DFT) calculations.
  • First-principles calculations to determine work function, density of states, and adsorption energy.
  • Development of a metallic bond-enabled wetting model.

Main Results:

  • Gallium-based liquid metal droplets transform into puddles on CuGa2 surfaces.
  • Formation of intermetallic CuGa2 on Cu surfaces induces stable metallic bonding and wetting.
  • Calculated work function of CuGa2 (010) (4.47 eV) is comparable to liquid Ga (4.32 eV), facilitating electron exchange.
  • Adsorption energy of Ga on CuGa2 is higher than In and Sn, indicating stronger interaction.
  • Wetting force is proportional to gallium adatom adsorption energy and increases with gallium content.

Conclusions:

  • Metallic bonding, driven by electron exchange and hybridization between Ga and CuGa2, is the primary cause of the observed wetting behavior.
  • The established wetting model accurately predicts interface forces, showing good agreement with experimental data.
  • Findings provide insights into the fundamental mechanisms governing liquid metal-intermetallic interactions.