相关实验视频

Updated: Jun 3, 2025

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

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聚晶石墨烯的晶格导热性和声子特性

Kunwar Abhikeern1, Amit Singh1

  • 1Department of Mechanical Engineering, IIT Bombay Mumbai Maharashtra India 400076 kunwarabhikeern@iitb.ac.in amit.k.singh@iitb.ac.in.

Nanoscale advances
|January 6, 2025
PubMed
概括

这项研究表明,粒度误导显著影响多晶石墨烯 (PC-G) 的导热性 (TC). 声波散射和寿命是关键因素,显示PC-G.

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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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