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[交流] 2025年巴黎高科 - CSC合作公派读博项目 - 课题No.55

2025年巴黎高科 - CSC合作公派读博项目 - 课题No.55
2025 巴黎高科 - CSC公派博士项目（12月8日截止）
网申通道：https://paristech.kosmopolead.com/phd
申请攻略：https://paristech.fr/fr/paristech-csc-phd-program-how-apply
课题55详情:

TITLE: WATCHING INTERFACIAL CHARGE DYNAMICS FOLLOWING LIQUID
AND SOLID TRIBOELECTRIFICATION
Topic number : 2024_055
Field : Energy, Processes
Subfield:
ParisTech School: ESPCI Paris - PSL
Research team :
Research team website: https://blog.espci.fr/jcomtet/
Research lab: SIMM - Sciences et ingénierie de la matière molle
Lab location: Paris
Lab website: https://www.simm.espci.fr/-Home-.html
Contact point for this topic: jean.comtet@espci.fr
Advisor 1: Jean Comtet - jean.comtet@espci.fr
Advisor 2:
Advisor 3:
Advisor 4:
Short description of possible research topics for a PhD:
The universally-known triboelectric effect results in the charging of solid
surfaces following mechanical contact. This ubiquitous phenomenon has
macroscopic consequences, both mundane and fundamental (tribocharging
leads to dust aggregation, which might be responsible for initial
planetary formation [1]). Very recently, triboelectricity has also seen a
surge of interest in the context of the development of novel energy
harvesting devices with exceptional performances [2]. However, the
origin of this surface charging remains fundamentally misunderstood,
being indistinctively attributed to the transfer of minute quantities of
electrons, ions or matter between surfaces [3]. We demonstrated recently
the possibility to map the spatial distribution and temporal evolution of
surface charges deposited during liquid triboelectrification, for which
charge separation occurs due to the sliding motion of droplets on
hydrophobic surfaces. Such spatio-temporal mapping allowed us to
evidence the occurrence of spatially heterogenous charging patterns as
well as a peculiarly high mobility of surface trapped charges, giving novel
insights on their physicochemical nature. The aim of this PhD is to clarify
the role of ion/surface interaction during liquid tribocharging and extend
these approaches to the case of solid triboelectrification between
insulating dielectric materials, whereby charge separation occurs during
frictional sliding. By coupling well-controlled tribological solicitations
with spatially and temporally resolved mapping of deposited surface
charges, we will attempt to relate the local frictional solicitations to the
surface electrification processes, hoping to obtain novel insight on these
fundamentally misunderstood electrification processes, with both
fundamental and practical implications. [1] T. Steinpilz et al., “Electrical
charging overcomes the bouncing barrier in planet formation,” Nature
Physics, vol. 16, no. 2, pp. 225–229, 2020. [2] W. Xu et al., “A dropletbased
electricity generator with high instantaneous power density,”
Nature, vol. 578, no. 7795, pp. 392–396, 2020. [3] D. J. Lacks and T.
Shinbrot, “Long-standing and unresolved issues in triboelectric
charging,” Nature Review Chemistry, 2019. [4] Li, Xiaomei, et al.
"Spontaneous charging affects the motion of sliding drops." Nature
Physics 18.6 (2022): 713-719.
Required background of the student:
tribology, soft matter, physics
A list of (5 max.) representative publications of the group: (Related
to the research topic)
1. T. Steinpilz et al., “Electrical charging overcomes the bouncing barrier
in planet formation,” Nature Physics, vol. 16, no. 2, pp. 225–229, 2020.
2. W. Xu et al., “A droplet-based electricity generator with high
instantaneous power density,” Nature, vol. 578, no. 7795, pp. 392–396,
2020.
3. D. J. Lacks and T. Shinbrot, “Long-standing and unresolved issues in
triboelectric charging,” Nature Review Chemistry, 2019.
4. Li, Xiaomei, et al. "Spontaneous charging affects the motion of sliding
drops." Nature Physics 18.6 (2022): 713-719.

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