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Improving Hydrophobicity of Glass Surface Using Dielectric Barrier Discharge Treatment in Atmospheric Air

Plasma Science and Technology 2007年第5期9卷 582-586页

作者：方志邱毓昌王辉 e.kuffel State Key Laboratory of electrical Insulation and Power equipment Xi'an Jiaotong UniversityXi'an 710049China School of AutomationNanjing University of TechnologyNanjing 210009China State Key Laboratory of electrical Insulation and Power equipment Xi'an Jiaotong UniversityXi'an 710049China Department of electrical and Computer engineering University of ManitobaWinnipeg R3T 2N2Canada

Non-thermal plasmas under atmospheric pressure are of great interest in industrial applications, especially in material surface treatment. In this paper, the treatment of a glass surface for improving hydrophobicity using the non-thermal plasma generated by dielectric barrier discharge （DBD） at atmospheric pressure in ambient air is conducted, and the surface properties of the glass before and after the DBD treatment are studied by using contact angle measurement, surface resistance measurement and wet flashover voltage tests. The effects of the applied voltage and time duration of DBD on the surface modification are studied, and the optimal conditions for the treatment are obtained. It is found that a layer of hydrophobic coating is formed on the glass surface after spraying a thin layer of silicone oil and undergoing the DBD treatment, and the improvement of hydrophobicity depends on DBD voltage and treating time. It seems that there exists an optimum treating time for a certain applied voltage of DBD during the surface treatment, The test results of thermal aging and chemical aging show that the hydrophobic layer has quite stable characteristics. The interaction mechanism between the DBD plasma and the glass surface is discussed. It is concluded that CHa and large molecule radicals can react with the radicals in the glass surface to replace OH, and the hydrophobicity of the glass surface is improved accordingly.

关键词： non-thermal plasma dielectric barrier discharge (DBD) surface treatment,hydrophobicity

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Insulator Surface Charge Measurement Using an Improved Capacitive Probe

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Plasma Science and Technology 2006年第5期8卷 565-568页

作者：汪沨邱毓昌李欣然 PFeIFFeR W kuffel e State Key Lab for electrical Insulation and Apparatus Xi'an Jiaotong University Xi'an 710049 China School of Electrical and Information Engineering Hunan University Changsha 410082 China State Key Lab for electrical Insulation and Apparatus Xi'an Jiaotong University Xi'an 710049 China School of electrical and Information engineering Hunan University Changsha 410082 China Technische Universitat Darmstadt 64283 Darmstadt Germany Dept. of electrical engineering and Computer Science University of Manitoba Winnipeg Canada

A surface charge measuring system using the capacitive probe method is analysed. The present study shows that the measuring system cannot have a steady-state output and that the error resulting from the finite leakage resistance of the measuring system will be accumulated during the measuring process. Based on the theoretical analysis a new type probe with a low charge leakage and high resolution is designed. The surface charge accumulated on the Teflon insulator under a DC voltage is measured using this new probe and some phenomena of the surface charging are reported.

关键词： surface charge, insulator capacitive probe

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Calculation of electron Swarm Parameters of SF_6/N_2 in a Uniform Field Using an Improved Monte Carlo Collision Simulation Method

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Plasma Science and Technology 2008年第1期10卷 39-42页

作者：汪沨 W.PFeIFFeR N.KOUZICHINe 邱毓昌 e.kuffel 李肯立 School of electrical and Information engineering Hunan University Changsha 410082. China Technische Universitt Darmstadt 64283 Darmstadt Germany School of electrical engineering Xi'an Jiaotong University Xi'an 710049 China Department of electrical engineering and Computer Science University of Manitoba Winnipeg Canada School of Computor and Communication Huna University Changsha 410084 China

The electron swarm parameters of SF6/N2 are calculated in the present study using an improved Monte Carlo collision simulation method （MCS）. And some improved sampling techniques are also adopted. The simulation res... 详细信息

关键词： Monte Carlo collision simulation gas discharge swarm parameter

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THeOReTICAL ANALYSIS OF CHARGe ACCUMULATION ON INSULATOR SURFACe UNDeR IMPULSe VOLTAGe IN A GAS INSULATeD SWITCHGeAR

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Academic Journal of Xi'an Jiaotong University 2002年第2期14卷 113-116,127页

作者：汪沨邱毓昌张乔根 kuffel e State Key Laboratory of electrical Insulation for Power equipment Xi'an Jiaotong University Department of electrical engineering University of Manitoba

Objective To investigate the process and mechanism of insulator surface charge accumulation under impulse voltage, a dynamic equation was established for describing the relationship between surface charge density and applied voltage. Results The established equation is more generalized in comparison with that given by other previous investigators. Constants A, B for typical electrodes used in the present equation are specified. The process and mechanism of surface charge accumulation under impulse voltage are studied and the factors that influence surface charge accumulation discussed. Conclusion The present theoretical studies help to explain why surface charging can be accomplished instantly under impulse voltage, and determine the factors influencing surface charge accumulation. The findings confirmed some surface charging phenomena observed in GIS by some previous investigators.

关键词： insulator surface charge impulse voltage

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