Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4902131
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Funding
- Swiss National Science Foundation (SNF)
- Engineering and Physical Sciences Research Council (EPSRC)
- Biotechnology and Biological Sciences Research Council (BBSRC)
- European Research Council (ERC)
- Frances and Augustus Newman Foundation
- BBSRC [BB/J002119/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/J002119/1] Funding Source: researchfish
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We present an approach for interfacing an electromechanical sensor with a microfluidic device for the accurate quantification of the dry mass of analytes within microchannels. We show that depositing solutes onto the active surface of a quartz crystal microbalance by means of an on-chip microfluidic spray nozzle and subsequent solvent removal provides the basis for the real-time determination of dry solute mass. Moreover, this detection scheme does not suffer from the decrease in the sensor's quality factor and the viscous drag present if the measurement is performed in a liquid environment, yet allows solutions to be analysed. We demonstrate the sensitivity and reliability of our approach by controlled deposition of nanogram levels of salt and protein from a micrometer-sized channel. (c) 2014 AIP Publishing LLC.
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