Environmentally Friendly Fluid (Image 4)
A close-up of the "lapping" machine used to evaluate fluids during research that engineered a new, environmentally friendly fluid for use in ceramic polishing. The fluid was derived in part from green tea. The chemical is part of a slurry that polishes ceramics (made from aluminum oxide and titanium carbide) used in computer hard-drive, read-write heads. The dark-brown rings on the rotating abrasive wheel are from the "lapping swarf." The swarf is a mixture of the newly developed fluid and ceramic debris particles from the read-write head specimen. During the process, researchers add the fluid drop by drop onto the rotating wheel. Centripetal acceleration causes the swarf to move to the outer edge of the rotating wheel.
This research was supported by a National Science Foundation (NSF) Small Business Innovation Research (SBIR) Phase I grant (DMI 03-19794), awarded to John Lombardi of Ventana Research Corporation in Tucson, Ariz. Lombardi received the award to develop high-performance, environmentally benign lapping fluids for hard-drive manufacturing applications. [Image 4 of 6 related images. See Image 5.]
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The new, biodegradable machining compound for computer hard-drive manufacturing is three- to four-times more effective than toxic counterparts, and is part of a family of machining fluids that bind to polishing debris and rapidly remove tiny particles from the polishing surface. The fluids are critical because imperfections in read-write heads must be less than 10 angstroms high--larger defects can cause the head to crash into the disk, causing data loss. Ventana formulates its fluid using a combination of synthetic proteins derived from common commercial chemicals and compounds extracted from green tea and other plants. The plant chemicals in the new fluid (the same ones that form stains in coffee pots and drinking mugs) are abundant and easily extractable, and they give the new fluid its ability to bind to the particle debris formed while polishing read-write heads.
Lombardi hopes the fluid's possible biocompatibility and high affinity for ceramics and metals may lead to applications in wastewater treatment (to remove heavy-metal contaminants) and medicine (the compound may have advantages in delivering certain cancer treatments).
NSF awards SBIR grants to small businesses for risky, novel research with a potential for commercialization. Through SBIR and the related Small Business Technology Transfer (STTR) programs, NSF encourages partnerships between the small business and the academic sectors to develop a technology base for commercialization.
This excerpt was taken from NSF Press Release PR 04-053, released April 19, 2004. The complete release is available Here. (Year of image: 2003)
|Credit: Erica von Koerber, Evon Photography (Tucson, Ariz.)
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