Related Experiment Video
Updated: Feb 13, 2026
09:12
Three-dimensional Characterization of Interorganelle Contact Sites in Hepatocytes using Serial Section Electron Microscopy
Published on: June 9, 2022
6.3K
On the Electron-Transfer Mechanism in the Contact-Electrification Effect
Cheng Xu1,2, Yunlong Zi1,3, Aurelia Chi Wang1
1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA.
Advanced Materials (Deerfield Beach, Fla.)
|March 7, 2018
Summary
Contact electrification (CE) is dominated by electron transfer between inorganic solids. A new model explains charge retention by a surface potential barrier, resolving a long-standing debate on CE mechanisms.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Contact electrification (CE), also known as triboelectrification, is a phenomenon with a long history but lacks a conclusive mechanistic model.
- Decades of debate surround the charge identity and mechanisms responsible for CE between materials.
Purpose of the Study:
- To quantitatively investigate real-time charge transfer in CE as a function of temperature.
- To elucidate the dominant charge transfer mechanism in CE between inorganic solids.
- To propose a new model explaining charge retention in CE.
Main Methods:
- Utilizing a triboelectric nanogenerator to study real-time charge transfer.
- Investigating charge transfer dynamics at various high temperatures.
- Analyzing surface charge density evolution over time.
Main Results:
- Electron transfer was identified as the dominant charge transfer process for CE between inorganic solids.
- Experimental results align with electron thermionic emission theory for Ti-SiO2 and Ti-Al2O3 triboelectric pairs at high temperatures.
- A surface potential barrier was discovered, hindering charge backflow and explaining electrostatic charge retention.
Conclusions:
- Electron transfer is the primary mechanism in CE between inorganic solids.
- A surface potential barrier is crucial for retaining electrostatic charges generated by CE.
- The proposed electron-cloud-potential-well model provides a general explanation for CE in conventional materials.
Related Concept Videos
02:48Ionic Bonding and Electron Transfer
49.8K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
49.8K
01:14Mechanisms of Heat Transfer
1.8K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
1.8K
01:19Mechanism of heat transfer
2.0K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
2.0K
01:14Mechanisms of Heat Transfer I
6.3K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
6.3K
01:20Mechanisms of Heat Transfer II
4.6K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.6K
01:13Contact Angle
25.7K
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
25.7K