Fast atom effect on helium gas/graphite interfacial energy transfer

Zhang, Lin; Song, Zhuorui; Zhao, Baozhen; Villarreal, Ezekiel; Ban, Heng

doi:10.1016/j.carbon.2020.01.058

Cited by 6 publications

(2 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the Monte Carlo Integration method was applied to convert the angle-resolved TAC into the TAC of all gas molecules from the hemispherical space. The probability density functions of gas velocity components with the fast atom effect are given by: [49]…”

Section: Conversion Of Tac Of the Angle-resolved Molecular Beam To Ta...mentioning

confidence: 99%

“…On the other hand, the gas molecules can have any given incident angle in the MD system, elucidating the scattering mechanism [36], and resolving the contributions by normal and planar accommodation. Most previous studies focused on bulk materials such as metal and graphite crystals [36,48,49]. Few studies reported on the thermal energy transfer between gas and two-dimensional (2D) materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal Energy Transfer between Helium Gas and Graphene Surface According to Molecular Dynamics Simulations and the Monte Carlo Method

Zhang

Ban

2022

Nanomaterials

Self Cite

View full text Add to dashboard Cite

The scattering of gases on solid surfaces plays a vital role in many advanced technologies. In this study, the scattering behavior of helium on graphene surfaces was investigated, including the thermal accommodation coefficient (TAC), outgoing zenith angle of helium, bounce number, and interaction time. First, we performed molecular dynamics simulations to describe the incident angle-resolved behaviors, and showed that the scattering is highly dependent on the zenith angle of incident helium but insensitive to the azimuthal angle. The contribution of the normal velocity component of the incident helium dominated the energy transfer. The nonlinear relationship of the parameters to the zenith angle of the incident helium could be suppressed by increasing the graphene temperature or decreasing the speed of the incident helium. Subsequently, the scattering performance considering all gas molecules in the hemispherical space was evaluated using the Monte Carlo method with angle-resolved results. The result showed that the TAC, its nominal components, and the zenith angle of the scattered helium increased with higher speeds of incident helium and lower temperatures of graphene. This study should provide a fundamental understanding of energy transfer between gas and two-dimensional materials and guidelines to tune the scattering behavior between them.

show abstract

Section: Conversion Of Tac Of the Angle-resolved Molecular Beam To Ta...mentioning

confidence: 99%