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Liquid crystal lubricants promise close-to-zero frictional losses


November 11, 2008

 One of the testing machines in which the researchers examine liquid crystals as lubrican...

One of the testing machines in which the researchers examine liquid crystals as lubricants: With which lubricant does the machine consume the least amount of energy?

November 12, 2008 Lubrication enables all of the world’s machinery to function, but even then, at least a quarter of all the energy is lost to friction. Despite some ingenious lubrication methods, at least 15% of the power made in a car engine is lost to friction. In most machinery, frictional losses are much higher than 15% and the heat resultant from friction generates trillions of dollars of repair and maintenance every year. Now a breakthrough in lubricant design employing liquid crystals promises a vast reduction in friction and some quite remarkable lubricants are about five years from market – oils that could reduce friction to almost zero.

Lubricants in bearings and gear units ensure that not too much energy is lost through friction. This new lubricant, developed by researchers at the Fraunhofer Institute for Mechanics of Materials IWM in Germany, uses liquid crystals like the ones used in LCD (Liquid Crystal Display) monitors. The big difference from normal lubricants is that molecules in liquid crystals have a certain orientation – you might compare them to matches with their heads all pointing in the same direction.

In a joint project with the Fraunhofer Institute for Applied Polymer Research IAP in Potsdam and the Mainz-based company Nematel, the IWM researchers are investigating which liquid crystals are most suitable for use as lubricants, and under what conditions. Their testing unit exerts a certain amount of force on a clamped metal cylinder that is moved back and forth over a supporting contact surface to enable them to measure the lubricant that yields the smallest amount of energy loss.

While the friction hardly changes when using conventional oil, it quickly drops to almost zero when liquid crystals are used. “Liquid crystals have not been suitable as a lubricant for ball bearings until now, as the contact pressure is too high – the friction does not drop far enough, says Fraunhofer’s Dr. Andreas Kailer. “For slide bearings, on the other hand, liquid crystals are the perfect solution.” Since liquid crystals have been produced mainly for monitors up to now, they have to be ultra-pure – which makes them very expensive. So the researchers now plan to simplify the synthesis process, since less pure substances are also suitable as lubricants,. “We hope to be able to market a liquid crystal lubricant in three to five years’ time,” says Kailer.

One of our favourite writers, engineer and journalist Kevn Cameron explains frictional losses particularly well here and if you like his stuff (highly recommended), check out the book of the best of his writings – he is perhaps, as one of the testimonials opines, “the finest technical writer the internal combustion press has ever known.”

About the Author
Mike Hanlon After Editing or Managing over 50 print publications primarily in the role of a Magazine Doctor, Mike embraced the internet full-time in 1995 and became a "start-up all-rounder" – quite a few start-ups later, he founded Gizmag in 2002. Now he can write again.   All articles by Mike Hanlon

The most surprising statement in this report is that "the friction hardly changes when using conventional oil, it quickly drops to almost zero when liquid crystals are used." Since when did conventional lubricants begin to "hardly change" friction? This appears to contradict over a century of lubricants research and empirical experience.

29th July, 2011 @ 12:04 pm PDT

In machine tooling the big effort is in keeping chips from attaching themselves to the tools. It isn't so much about cooling. For example a large drill press could cool just fine if the bit and part are under a cascade of nothing but water. But the lubes that area added act to keep those chips from sticking to the tools. If you remove a tool that is freshly used you can find chips that are stuck on the tools but they are not welded on as such and you can usually get them off without too much cleaning.

Jim Sadler
7th April, 2015 @ 05:47 pm PDT
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