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. 2018 Jun 1;8(2):52. doi: 10.3390/bios8020052

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

(A) shows a tetra electrode quartz crystal microbalance QCM design and its placement in plexiglass measuring cell, reproduced with permission from [102]; (B) another deign of tetra electrode QCM placed in polydimethylsiloxane (PDMS) chamber, reproduced with permission from [103].