Title: Solving Triboelectricity

Speaker: Yong-Hyun Kim (Department of Physics, KAIST)

Time and location: Nov. 23rd (Wed) 17:00 PM-18:00 PM, Science Building AB101

Abstract

Triboelectricity has a history of more than 2600 years to the ages of Thales and Plato in ancient Greece. The friction-driven static electrification is familiar and fundamental in daily life, industry, and technology, but its origin has long been unknown. It is very mysterious, in spite of the state-of-the-art quantum mechanics and condensed matter physics, why we do not know which material will be charged positively or negatively when two materials are rubbed. We jumped into this problem after we realized an abrupt temperature drop at the interface of two materials could cause significant thermoelectricity [1]. Recently we have finally arrived at a quantitative explanation about origin of triboelectricity using heat transfer solutions and electronic structure calculations [2]. Here I will introduce how we formulate a theory of triboelectricity based on thermoelectric physics between two rubbing materials, which leads us to profound understandings and new discoveries on the fundamental phenomenon.

[1] E.-S. Lee, S. Cho, H.-K. Lyeo, and Y.-H. Kim, Seebeck effect at the atomic scale, Phys. Rev. Lett. 112, 136601 (2014).

[2] E.-C. Shin, J.-H. Ko, H.-K. Lyeo, and Y.-H. Kim, Derivation of a governing rule in triboelectric charging and series from thermoelectricity, Phys. Rev. Research 4, 023131 (2022)

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