scholarly journals Surface Hydrophobicity in Medium Voltage Terminations

2019 ◽  
pp. 94-96
Author(s):  
Kenneth Kimmo Miika Väkeväinen
Keyword(s):  
Electrical Activity ◽  
Convenient Method ◽  
Environmental Conditions ◽  
Surface Hydrophobicity ◽  
Leakage Currents ◽  
Medium Voltage ◽  
Silicone Coating ◽  
Surface Discharges ◽  
Effect Of Surface

The surface hydrophobicity in medium voltage terminations is studied in this paper to see if the performance of aged heat shrink terminations could be improved. Terminations which are used inside of unheated outdoor enclosures can often be subjected to leakage currents and surface discharges along the insulating surface if the environmental conditions inside the enclosure become harsh. The discharge phenomena on the insulating surface is generally not critical but continuous electrical activity on the surface could eventually lead to a flashover or breakdown as the materials age. The effect of surface hydrophobicity was studied by comparing the performance of heat shrink terminations over a longer time in operation. Improvements were done to aged heat shrink indoor terminations which already had signs of discharge occurrence on the termination surfaces. The results indicate that the performance of these aged terminations improved simply by increasing the surface hydrophobicity of the original installation. The improvement can be done by applying a silicone coating on the termination surface. This solution offers a convenient method for improving the performance of aged heat shrink terminations used in unheated outdoor enclosures.

Measuring Surface Hydrophobicity as Compared to Measuring a Hydrophobic Effect on Adhesion Events

1995 ◽  
Vol 58 (9) ◽  
pp. 1034-1037 ◽  
Author(s):  
H. AL-MAKHLAFI ◽  
M. LAKAMRAJU ◽  
N. PODHIPLEUX ◽  
B. SINGLA ◽  
J. MCGUlRE
Keyword(s):  
Contact Angle ◽  
Bacteriophage T4 ◽  
Hydrophobic Effect ◽  
Surface Hydrophobicity ◽  
Antimicrobial Proteins ◽  
Hydrophilic Surfaces ◽  
Measuring Surface ◽  
Simple Contact ◽  
Contact Angle Analysis ◽  
Effect Of Surface

Simple contact-angle methods are commonly used to describe surface influences on phenomena including adsorption, adhesion, fouling, and cleaning, However, for the purpose of quantitatively relating surface hydrophobicity to such phenomena, contact-angle analysis may be insufficient. Here we show that even with model hydrophobic and hydrophilic surfaces, measurement of the effect of surface hydrophobicity on adsorption of the antimicrobial proteins nisin and bacteriophage T4 lysozyme yielded conflicting results, apparently because different mechanisms govern events at the interface, depending on surface hydrophobicity. This finding is explained in terms of the presence of two competing mechanisms for attractive associations at these surfaces: hydrophobic and attractive electrostatic associations.

Patterning PETN and HMX using Dip Pen Nanolithography

2005 ◽  
Vol 896 ◽  
Author(s):  
Omkar Nafday ◽  
Brandon Weeks ◽  
Jason Haaheim ◽  
Ray Eby
Keyword(s):  
Surface Energy ◽  
Scanning Probe Microscopy ◽  
Convenient Method ◽  
Energetic Materials ◽  
Scanning Probe ◽  
Pentaerythritol Tetranitrate ◽  
High Explosives ◽  
Shock Initiation ◽  
Effect Of Surface ◽  
Dip Pen Nanolithography

AbstractRecently there has been a focused effort to develop reliable nanoscopic writing and reading capabilities. Dip-pen nanolithography (DPN) has emerged as a convenient method to deliver nanoscale materials onto a substrate by leveraging scanning probe microscopy capability. A new application for the DPN method is the field of microdetonics which is the microscale decomposition and study of reactions of explosives. Results are presented for patterning pentaerythritol tetranitrate (PETN) and cyclotetramethylene tetranitramine (HMX) on silicon and mica substrates. The ultimate goal is to pattern both energetic materials in nanoscale registry and investigate their reaction and decomposition at the nanoscale due to heating or shock initiation. In addition to patterning of high explosives, a discussion on the effect of surface energy on patterning rates is investigated. This knowledge will be applicable to inks beyond high explosives.

Effect of surface modification on interfacial nanobubble morphology and contact line tension

Soft Matter ◽  
2015 ◽  
Vol 11 (26) ◽  
pp. 5214-5223 ◽  
Author(s):  
Kaushik K. Rangharajan ◽  
Kwang J. Kwak ◽  
A. T. Conlisk ◽  
Yan Wu ◽  
Shaurya Prakash
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Modification ◽  
Contact Line ◽  
Line Tension ◽  
Surface Hydrophobicity ◽  
Saturation State ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mode Atomic Force Microscopy ◽  
Effect Of Surface

Using tapping mode atomic force microscopy, changes to interfacial nanobubble morphology and associated characteristics are analyzed as a function of surface hydrophobicity and solvent–air saturation state.

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