DRY CLEANING

Written by Science Knowledge on 3:39 AM

A WASHING MACHINE THAT SWAPS WATER FOR DIRT-BUSTING PLASTIC

Clean your clothes without putting them—or your utility bills—through the wringer. Xeros’s prototype washing machine uses 90 percent less water than ordinary models, which also eliminates energy-intensive spin cycles and dryer blasts. The machine replaces all but one tenth of the usual water and about one third of the usual detergent with 0.1-inch plastic beads, reusable for hundreds of washes. The beads are made of the same nylon as many carpets, because the properties that make nylon easy to stain also make it a great scrubber: Its polarized molecules attract soil, and in the humidity created by a little water, the polymer chains separate slightly to absorb grime and lock it into the beads’ cores.

Nylon beads sit in the outer of two nested drums. When both drums rotate, the absorbent beads fall through the mesh of the inner drum to tumble with your laundry, where they dislodge and trap dirt. After the wash cycle finishes, the outer drum stops moving and centripetal force pushes the beads back through the mesh into the outer drum, where they await your next mess.

Xeros aims to put machines in commercial laundries next year, where they will use eight gallons of water instead of 80 for each 45-pound load. They may be cleaning your favorite T-shirts at home within several years.

Source of Information : Popular Science November 2009

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In its broadest sense, science (from the Latin scientia, meaning "knowledge") refers to any systematic knowledge or practice. In its more usual restricted sense, science refers to a system of acquiring knowledge based on scientific method, as well as to the organized body of knowledge gained through such research.

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