Working at the molecular level, the researchers relied on the tendency of certain combinations of molecules to repel each other at close contact, effectively suspending one surface above another by a microscopic distance.
"The emerging technology of nanomechanics has the potential to improve medicine and other fields," said Duane Alexander, M.D., director of the NIH?s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD). "By reducing the friction that hinders motion and contributes to wear and tear, the new technique provides a theoretical means for improving machinery at the microscopic and even molecular level."
The study appears in the Jan.8 issue of Nature.
The research was conducted by Jeremy N. Munday and Federico Capasso of Harvard University, and V. Adrian Parsegian, Ph.D., head of the Section on Molecular Biophysics at the NICHD.
Dr. Parsegian explained that, analogous to the way like poles of magnets repel each other, certain combinations of molecules generate repulsive electrical forces that will prevent them from coming in contact with each other under certain conditions.
In their study, the researchers brought a tiny gold-plated sphere in contact with a flat glass surface, separating them with a liquid known as bromobenzene. At close distances, the molecular forces of the two surfaces, when in the presence of bromobenzene, repelled each other, so that the molecules of gold and glass never came in direct contact with each other and were separated by a few nanometers.
The NICHD sponsors research on development, before and after birth; maternal, child, and family health; reproductive biology and population issues; and medical rehabilitation. For more information, visit the Institute?s Web site at http://www.nichd.nih.gov/.