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Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
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Updated: Jun 22, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Published on: October 12, 2019

Structural superlubricity at the interface of penta-BN₂.

Hao Wang¹, Hanyue Zhang², Xinqi Zhang¹

¹State Key Laboratory of Solidification Processing, Center for Advanced Lubrication and Seal Materials, School of Material Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China. xlfan@nwpu.edu.cn.

Physical Chemistry Chemical Physics : PCCP

|July 1, 2024

Summary

Two-dimensional penta-boron nitride (penta-BN₂) exhibits robust superlubricity at incommensurate interfaces. This novel 2D material demonstrates excellent stability, making it a promising candidate for advanced solid lubrication applications.

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Area of Science:

Materials Science
Tribology
Condensed Matter Physics

Background:

Two-dimensional (2D) materials are utilized as solid lubricants due to their low interlayer shear resistance.
Penta-boron nitride (penta-BN₂) is a 2D material with exceptional thermal and mechanical stability.
Understanding friction in 2D materials is crucial for developing advanced lubrication technologies.

Purpose of the Study:

To investigate the frictional properties of penta-BN₂ at both commensurate and incommensurate interfaces.
To explore the mechanisms behind the superlubricity observed in penta-BN₂.
To assess the influence of various parameters on the tribological behavior of penta-BN₂.

Main Methods:

Molecular dynamics (MD) simulations were employed to model the tribological behavior.
Analysis of potential energy surface (PES) fluctuations, interlayer binding energy, and out-of-plane motion.
Systematic variation of interface commensurability, Moiré pattern size, normal force, temperature, and sliding velocity.

Main Results:

Robust superlubricity was achieved at the incommensurate contacting interface of penta-BN₂.
Ultra-low friction is attributed to PES fluctuations, low interlayer binding energy, and significant out-of-plane motion.
Friction anisotropy is more pronounced at commensurate interfaces compared to incommensurate ones.

Conclusions:

Two-dimensional penta-BN₂ is a highly promising solid lubricant material.
The findings enrich the landscape of 2D materials for lubrication applications.
Penta-BN₂ offers a unique combination of stability and low friction properties.