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Title: Temperature-dependent complex dielectric permittivity: a simple measurement strategy for liquid-phase samples

Journal Article · · Scientific Reports
 [1];  [2];  [2];  [1]
  1. Univ. of Delaware, Newark, DE (United States)
  2. Valencia Polytechnic University (Spain)

Microwaves (MWs) are an emerging technology for intensified and electrified chemical manufacturing. MW heating is intimately linked to a material’s dielectric permittivity. These properties are highly dependent on temperature and pressure, but such datasets are not readily available due to the limited accessibility of the current methodologies to process-oriented laboratories. We introduce a simple, benchtop approach for producing these datasets near the 2.45 GHz industrial, medical, and scientific (ISM) frequency for liquid samples. By building upon a previously-demonstrated bireentrant microwave measurement cavity, we introduce larger pressure- and temperature-capable vials to deduce temperature-dependent permittivity quickly and accurately for vapor pressures up to 7 bar. Our methodology is validated using literature data, demonstrating broad applicability for materials with dielectric constant ε' ranging from 1 to 100. We provide new permittivity data for water, organic solvents, and hydrochloric acid solutions. Finally, we provide simple fits to our data for easy use.

Research Organization:
American Institute of Chemical Engineers (AIChE), New York, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE
Grant/Contract Number:
EE0007888; EE0007888-7.6
OSTI ID:
2203487
Alternate ID(s):
OSTI ID: 2471800
Journal Information:
Scientific Reports, Vol. 13, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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