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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 2 | Copyright
Atmos. Meas. Tech., 9, 655-668, 2016
https://doi.org/10.5194/amt-9-655-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 26 Feb 2016

Research article | 26 Feb 2016

Piezoelectric crystal microbalance measurements of enthalpy of sublimation of C2–C9 dicarboxylic acids

F. Dirri1, E. Palomba1, A. Longobardo1, and E. Zampetti2 F. Dirri et al.
  • 1Institute for Space Astrophysics and Planetology, Research Area of Tor Vergata, Via Fosso del Cavaliere 100, Rome, Italy
  • 2Institute of Atmospheric Pollution Research, Research Area of Rome 1, Via Salaria km 29,300 Monterotondo, Rome, Italy

Abstract. We present here a novel experimental set-up that is able to measure the enthalpy of sublimation of a given compound by means of piezoelectric crystal microbalances (PCMs). The PCM sensors have already been used for space measurements, such as for the detection of organic and non-organic volatile species and refractory materials in planetary environments. In Earth atmospherics applications, PCMs can be also used to obtain some physical–chemical processes concerning the volatile organic compounds (VOCs) present in atmospheric environments. The experimental set-up has been developed and tested on dicarboxylic acids. In this work, a temperature-controlled effusion cell was used to sublimate VOC, creating a molecular flux that was collimated onto a cold PCM. The VOC recondensed onto the PCM quartz crystal, allowing the determination of the deposition rate. From the measurements of deposition rates, it has been possible to infer the enthalpy of sublimation of adipic acid, i.e. ΔHsub : 141.6 ± 0.8kJmol−1, succinic acid, i.e. 113.3 ± 1.3kJmol−1, oxalic acid, i.e. 62.5±3.1kJmol−1, and azelaic acid, i.e. 124.2±1.2kJmol−1. The results obtained show an accuracy of 1% for succinic, adipic, and azelaic acid and within 5% for oxalic acid and are in very good agreement with previous works (within 6% for adipic, succinic, and oxalic acid and within 11% or larger for azelaic acid).

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A novel experimental set-up based on piezoelectric crystal microbalances has been used to monitor the sublimation processes concerning some volatile organic compounds present in the terrestrial atmosphere. The experimental set-up has been developed and tested on dicarboxylic acids. By means of the molecular flux, it has been possible to infer the enthalpy of sublimation of oxalic, succinic, adipic and azelaic acid. The results obtained are in very good agreement with previous works.
A novel experimental set-up based on piezoelectric crystal microbalances has been used to...
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