What is it about?

Surface atomic or molecular undercoordination shortens and stiffens the H-O bond but lengthens and softens the O:H nonbond by the O—O repulsion and polarization. The soft O:H phonon adaptivity and the dipolar repulsivity make the contact interface superlubricity, super hydrophobicity, and superfluidity, and ice frictionless, a mimic of the maglev.

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Why is it important?

Consideration of surface molecular undercoordination and its effect on the bonding phonons and electronic polarization leads to groundbreaking understanding of the slipperiness of ice and extends to quantum friction that is of particular interest of industrial sectors.

Perspectives

The interface elastic Coulomb repulsivity and soft phonon elastic adaptivity dictate the superlubricity of ice, wet and dry frictions, which also reconciles the superhydrophobicity, superlubricity, and supersolidity at contacting interface.

Dr Chang Qing Sun
NTU

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This page is a summary of: From ice superlubricity to quantum friction: Electronic repulsivity and phononic elasticity, Friction, December 2015, Tsinghua University Press,
DOI: 10.1007/s40544-015-0097-z.
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