Material Type  

 학위논문

 

0016932817

Date and Time of Latest Transaction  

20240214100549

ISBN  

9798379842406

DDC  

621

Author  

Tao, Hongcheng.

Title/Author  

Air Breakdown in Contact Electrification - [electronic resource]

Publish Info  

[S.l.] : Purdue University., 2022

Publish Info  

Ann Arbor : ProQuest Dissertations & Theses, 2022

Material Info  

1 online resource(92 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

General Note  

Advisor: Gibert, James.

학위논문주기  

Thesis (Ph.D.)--Purdue University, 2022.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Abstracts/Etc  

요약Contact electrification of solids in a gas medium involves two stages, i.e., surface charge deposition immediately at separation, and dissipation due to dielectric breakdown of the medium as the gap increases. The presumption that such gas breakdown obeys Paschen's law, which is conventionally determined for gas between electrodes with constant charge supply, is widely accepted yet unverified. The present work experimentally validates such dependence of the breakdown voltage of air between charged dielectric surfaces on both its pressure and the gap distance. Sample surfaces are brought to cycles of contact electrification in a vacuum chamber and charge relaxation due to air breakdown is monitored with measurements of the Coulomb attraction by fixing either the air pressure or gap distance and varying the other. The results indicate thresholds of pressure and distance to facilitate investigations of the raw amount of charge transfer prior to any breakdown discharge, which is adopted to examine the saturation trend of surface charge density in the contact electrification of multiple material combinations using the same test apparatus. Comparatively consistent results are obtained in repeated tests for a variety of contact pairs, while a reduction of saturated surface charge density is observed for PTFE against PDMS after breakdown discharge in low-pressure air, which is preliminarily attributed to alternations of PTFE surfaces caused by accelerated cation strikes during air breakdown, based on SEM images and estimations of particle energy in Townsend avalanches. Conclusions on both the general raw level of surface charge density and the air breakdown during separation in contact electrification are applied to complement models of vibro-impact triboelectric energy harvesters for predicting their performance under various air pressures and physical dimensions in order to either prevent or exploit air breakdown to enhance the power output.

Subject Added Entry-Topical Term  

Fractals.

Subject Added Entry-Topical Term  

Polyvinyl alcohol.

Subject Added Entry-Topical Term  

Energy.

Subject Added Entry-Topical Term  

Electrons.

Subject Added Entry-Topical Term  

Electrodes.

Subject Added Entry-Topical Term  

Radiation.

Subject Added Entry-Topical Term  

Electric fields.

Subject Added Entry-Topical Term  

Cosmic rays.

Subject Added Entry-Topical Term  

Avalanches.

Subject Added Entry-Topical Term  

Microscopy.

Subject Added Entry-Topical Term  

Astronomy.

Subject Added Entry-Topical Term  

Atomic physics.

Subject Added Entry-Topical Term  

Electromagnetics.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Polymer chemistry.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 85-01B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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소장사항  

202402 2024

Control Number  

joongbu:643409