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The levitation of microdroplets of about 30 mum in diameter was achieved inside 100-mum wide trenches machined by electroerosion in permanent magnets. A low-cost mass production technique with thick permanent micromagnets electroplated above silicon was also implemented into various matrix configurations. The devices were tested with diamagnetic latex microbeads of mean diameter 3 mum in a paramagnetic buffered solution. Trapping and arraying of microparticles in stable spatial levitation within magnetic wells were successfully achieved. Contactless passive levitation brings amazing possibilities to bio-chips, including fast arraying of unlabelled cells or microbeads on micromagnets, and contamination-free biochemical micro-reactors.
Date of Conference: 8-12 May 2006