25.2 Perspectives
499
liquid and solid, varying from conductors to insulators under any applied perturbations, and provides quantitative information about bonding dynamics and
consistent insight into the physics behind observations.
(4) As an independent degree of freedom that laid foundation of defect physics, surface chemistry, and nanoscience and nanotechnology, atomic and molecular
undercoordination has yet received deserved attention. Atomic CN reduction
shortens and stiffens bonds between the undercoordinated atoms, which modify
electrons in various energy bands, and dictate the performance of substance.
(5) It is necessary to take liquid water as crystal with numbers of protons and
lone pairs and the O:H–O configuration conservation and molecular and proton motion restriction. Charge injection by solvation does not form new
bonds between the solute and solvent unless acid and base solvation occurs,
which breaks the conservation rule of pure water by forming the (H 3 O
+ ;
HO
− ):4H 2 O motifs. New kinds of intermolecular H↔H and O:⇔:O repulsive
interactions need particular attention.
(6) The O:H–O segmental specific heat disparity derived QS phase may apply to
negative thermal expansion of substance with multiple interaction potentials
being involved, such as ZrWO 8 and graphite. Each potential corresponds to a
specific heat and the superposition of such specific heat curves specifies the
structural phases of different specific heat ratios.
Understanding and strategies may extend to wherever the regular chemical bonds
and the segmented hydrogen bonds are involved. It would be very promising for
one to keep arm and mind open, and always move and look forward to developing
experimental strategies and innovating ideas toward resolution to the wonders.
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