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https://hdl.handle.net/2440/98895
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Type: | Journal article |
Title: | A microtensiometer capable of measuring water potentials below -10 MPa |
Author: | Pagay, V. Santiago, M. Sessoms, D. Huber, E. Vincent, O. Pharkya, A. Corso, T. Lakso, A. Stroock, A. |
Citation: | Lab on a Chip: miniaturisation for chemistry, physics, biology, materials science and bioengineering, 2014; 14(15):2806-2817 |
Publisher: | Royal Society of Chemistry |
Issue Date: | 2014 |
ISSN: | 1473-0197 1473-0189 |
Statement of Responsibility: | Vinay Pagay, Michael Santiago, David A. Sessoms, Erik J. Huber, Olivier Vincent, Amit Pharkya, Thomas N. Corso, Alan N. Lakso and Abraham D. Stroock |
Abstract: | Tensiometers sense the chemical potential of water (or water potential, Ψw) in an external phase of interest by measuring the pressure in an internal volume of liquid water in equilibrium with that phase. For sub-saturated phases, the internal pressure is below atmospheric and frequently negative; the liquid is under tension. Here, we present the initial characterization of a new tensiometer based on a microelectromechanical pressure sensor and a nanoporous membrane. We explain the mechanism of operation, fabrication, and calibration of this device. We show that these microtensiometers operate stably out to water potentials below -10 MPa, a tenfold extension of the range of current tensiometers. Finally, we present use of the device to perform an accurate measurement of the equation of state of liquid water at pressures down to -14 MPa. We conclude with a discussion of outstanding design considerations, and of the opportunities opened by the extended range of stability and the small form factor in sensing applications, and in fundamental studies of the thermodynamic properties of water. |
Keywords: | Silicon Water Membranes, Artificial Calibration Microchemistry Equipment Design Materials Testing Transducers, Pressure Surface Properties Algorithms Porosity Thermodynamics Mechanical Phenomena Electrochemical Techniques Lab-On-A-Chip Devices Printing, Three-Dimensional |
Rights: | © The Royal Society of Chemistry 2014 |
DOI: | 10.1039/c4lc00342j |
Published version: | http://dx.doi.org/10.1039/c4lc00342j |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 3 |
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