Mercury adhesion and wetting to plastics/polycarbonate/glass

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SUMMARY

This discussion focuses on the compatibility of mercury with various materials in the context of a Magnetohydrodynamic (MHD) system. Mercury exhibits low adhesion to most surfaces, including polycarbonate and glass, making these materials suitable for minimizing friction in the system. However, mercury reacts with copper, forming an amalgam, necessitating the use of alternative coatings such as palladium or platinum to ensure electrode integrity. The feasibility of electroplating these metals onto copper is also considered for optimal performance.

PREREQUISITES
  • Understanding of Magnetohydrodynamics (MHD) systems
  • Knowledge of material compatibility, specifically with mercury
  • Familiarity with electroplating techniques
  • Basic principles of surface adhesion and friction
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  • Research the properties of polycarbonate and glass in relation to mercury adhesion
  • Investigate alternative materials for electrodes that are compatible with mercury
  • Learn about electroplating processes for palladium and platinum on copper
  • Explore methods to minimize surface adhesion in liquid metal systems
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Researchers and engineers working on MHD systems, materials scientists, and anyone involved in the design and optimization of systems utilizing mercury as a working fluid.

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Hi, I am starting to make some experiments with my project and part of it involves developing a small MHD system. Now for test purposes and ease of manufacturing I have decided I want to use some clear see through plastic which would help me see whether my experiment is working as planned. My question is since I am making a loop in which mercury will travel under MHD flow, I obviously need as low surface adhesion/friction as possible. I know that mercury has a very low adhesion to most surfaces naturally, my question is does mercury "live well" with polycarbonate glass and will it not wet the glass surface as I need the mercury to not attach to the walls and slow down.?

I will also need to insert electrodes into my system , is copper ok with mercury or does ti react with it? All in all I need my materials such that the mercury doesn't wet itself to the walls and at the same time that I have electrodes with which the mercury has good contact,

Any suggestions are appreciated, thanks.
 
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Mercury will form an amalgam with copper.
 
I guess I will need to coat the copper electrodes with some other metal right ?

The only metals that have high conductivity and are compatible with mercury seem to be the pgm group like palladium or platinum, I wonder how complicated it would be to electroplate one of these on a thin copper sheet.
 
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