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On-chip particle-laden droplet dispensing by disposable inkjet system

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5 Author(s)

We succeeded in dispensing micro-droplet by a disposable on-chip inkjet mechanism. Novelty of this paper is summarized as follows. (1) We employed a glass plate bonded Poly-dimethylsiloxane (PDMS) membrane to obtain leaf spring structure whose spring coefficient is 14 times of the conventional PDMS membrane. As a result, we succeeded in dispensing droplets continuously (up to 10 Hz) by vibrating the membrane using the multilayers piezoelectric actuator attached to the PDMS disposable chip. (2) The nozzle for droplet dispensing was fabricated by thick photoresist (SU-8) to obtain the hydrophobic surface which prevents any undesired satellite droplets produced. Consequently the accuracy of position of the droplet dispensing was achieved ± 5 ¿m. The size of the droplet produced from the disposable nozzle (diameter = 100 ¿m) was in the range of 95-105 ¿m at the applied voltage of 105 V.

Published in:

Micro-NanoMechatronics and Human Science, 2009. MHS 2009. International Symposium on

Date of Conference:

9-11 Nov. 2009

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