A Compact, Low-cost Microliter-range Liquid Dispenser based on Expandable Microspheres
2006 (English)In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 16, no 12, 2740-2746 p.Article in journal (Refereed) Published
This work presents a new low-cost liquid dispenser for the dispensing of microliters to milliliter volumes. The dispensing mechanism is based on a thermal actuator where highly expandable microspheres expand into a liquid reservoir consequently displacing any stored liquid. All device components are made out of low-cost materials and the fabrication process has the potential for high volume batch manufacturing. The device utilizes the property of the expandable microspheres to form a heat insulating layer between the heat source and the delivered liquid. Moreover, it does not require any feed back or complicated flow metering. The device was successfully tested showing a mean dispensed volume of 101 mu 1 with a standard deviation of 3.2% and with a maximum temperature of 59 degrees C in the liquid during actuation. It was shown that the dispenser is strong enough to deliver against counter pressures as high as 75 kPa. The device can also function as a low flow rate dispenser as demonstrated in a microfluidic dye laser application. The flow rate can be controlled between 1 mu 1 h(-1) and 2400 mu 1 h(-1) by adjusting the actuation power.
Place, publisher, year, edition, pages
2006. Vol. 16, no 12, 2740-2746 p.
FLOW-CONTROL; VALVE; Actuators; Dye lasers; Fluidics; Pressure effects; Reservoirs (water); Thermal insulating materials; Expandable microspheres; Heat insulating layers; Milliliter volumes; Volume batch manufacturing; Dispensers
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-7458DOI: 10.1088/0960-1317/16/12/030ISI: 000242475200030ScopusID: 2-s2.0-33846117051OAI: oai:DiVA.org:kth-7458DiVA: diva2:12489
QC 201006232007-09-102007-09-102015-09-23Bibliographically approved