Nano-boric Acid Tweaks Motor Oil Lubricity, Energy Efficiency

Argonne researcher Ali Erdemir performs a friction test on a metal disc coated with a solution of motor oil with nano-boric acid particles.Photo: Argonne National LaboratoryARGONNE, IL (Aug. 3, 2007) - One key to saving the environment, improving our economy and reducing our dependence on foreign oil might just be sitting in your mother's medicine cabinet. Scientists at the U.S. Department of Energy's Argonne National Laboratory have begun to combine infinitesimal particles of boric acid - known primarily as a mild antiseptic and eye cleanser - with traditional motor oils in order to improve their lubricity and by doing so, increase energy efficiency. Ali Erdemir, senior scientist in Argonne's Energy Systems Division, has spent nearly 20 years investigating the lubricious properties of boric acid. In 1991, he received an R&D 100 award - widely considered the "Oscar of technology" - for showing that microscopic particles of boric acid could dramatically reduce friction between automobile engine parts. Metals covered with a boric acid film exhibited coefficients of friction lower than that of Teflon, making Erdemir's films the slickest solids in existence at that time. "Ali was looking at large, micron-sized particles," says George Fenske, who works alongside Erdemir at Argonne. "He was just sprinkling boric acid onto surfaces." But driven by a conviction that he could fashion boric acid into an even better lubricant, Erdemir continued to chase the ultimate frontier: a perfectly frictionless material. Glimpsing the potential of nanotechnology, Erdemir went smaller - 10 times smaller - and was astonished by the behavior of much thinner boric acid films. "If you can produce or manufacture boric acid at the nanoscale, its properties become even more fantastic," he says. Motor MedicineBoric acid owes its lubricious properties to its unique natural structure. The compound consists of a stack of crystallized layers in which the atoms tightly adhere to each other. However, these layers stack themselves relatively far apart, so that the intermolecular bonds - called van der Waals forces - are comparatively weak. 

Through a simple chemical reaction, nano-boric acid can be transformed into a liquid relative of boric acid that has shown potential to increase fuel lubricity. When stressed, the compound's layers smear and slide over one another easily, like a strewn deck of playing cards. The strong bonding within each layer prevents direct contact between sliding parts, lowering friction and minimizing wear.Until recently, most of Ali Erdemir's work in boric acid lubrication had been restricted to motor oils, principally because of the relative bulk of the larger particles. The move to the nanoscale, however, has opened up other possible uses of the chemical. 

Reducing the size of the particles to as tiny as 50 nanometers in diameter - less than one-thousandth the width of a human hair - solved a number of old problems and opened up a number of new possibilities, Erdemir says. In previous tests, his team had combined the larger boric acid particles with pure poly-alpha-olefin, the principal ingredient in many synthetic motor oils. While these larger particles dramatically improved the lubricity of the pure oil, within a few weeks gravity had started to separate the mixture. By using smaller particles, Erdemir created a stable suspension of boric acid in the motor oil.

In laboratory tests, these new boric acid suspensions have reduced by as much as two-thirds the energy lost through friction as heat. The implications for fuel economy are not hard to imagine, Erdemir says. 

"You're easily talking about a 4 percent or 5 percent reduction in fuel consumption," he says. "In a given day, we consume so many millions of barrels of oil, and if you can reduce that number by even 1 percent, that will have a huge economic impact."

The substitution of liquid boric acid for sulfur-containing additives preserves the health of the car as well as that of the environment. Sulfur exhaust gradually coats the surface of a car's catalytic converter, the part that helps to reduce the toxicity of a car's emissions. Eventually, the converter becomes so choked with sulfur that it is no longer able to process any more exhaust.

Using this liquid analog of solid boric acid as a fuel additive on a large scale could greatly benefit the environment, both because it would help to increase fuel efficiency and because it would replace existing fuel lubricants that are potentially harmful to the environment, Erdemir says. By themselves, most fuels - especially diesels - contain some sulfur and other special chemical additives to boost lubricity. When burned, however, some of these additives along with sulfur may cause harmful emissions and acid rain. However, the lack of a suitable alternative complicates efforts to cut sulfur content.

Argonne is currently in talks with materials and lubricant manufacturers to bring boric acid technology to market, Erdemir says. While these new additives need to pass a battery of environmental and safety tests, they will probably be available within two years. He shares that that the compound has not only proved an effective lubricant, but was also every industrial technologist's dream: It came from naturally abundant minerals, was cheap to manufacture, and posed no health hazards or environmental threats.

(Source: Argonne National Laboratory)