1. Introduction - 2. Development
Applications - 4. Links
5. Liquid metal Elastic Stretchable wire - 6. Practical issues
Resistance of Liquid Metals and other metals
Before you worry that the resistance of liquid metals is too high, consider the applications and the overall effect. For example, if I am only using liquid metal to "tune" the end of an element then the effect on the overall resistance is less. There are other advantages, like being able to tune to reduce SWR loss.
The following table is a comparison of different metals. I converted this information from various sources and verified it, so I believe it is generally correct. If you see any errors, let me know.
Ohms mm2/m gives you a good idea of the resistance for 3
feet of a liquid metal in the 1/16 inch id tubing that I am using.
It is interesting that liquid Mercury has about twice the resistance of
Galinstan liquid metal. The metals that make up the Galinstan each
have less resistance than the alloy, so I wonder if a better compromise
of resistance vs. melting point could be made. It might not hurt
it to freeze in certain applications.
||Ohms mm2/m||Times better
|Galinstan liquid metal
(Gallium, Indium, Tin)
* Caution: Gallium based liquid metals will dissolve quickly into
aluminum, and can ruin the aluminum. Interestingly a very small amount
can be used to "weld" two pieces of aluminum together.
Links & more
Liquid Metal Antenna group on Yahoo!
See the Main page of Ham Domain.com - or - About me on hamdomain.com
© Copyright 2005 - Michael John Lake - Make copies for personal use only.