Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles

Dette HP, Koop T (2015)
The Journal of Physical Chemistry A 119(19): 4552-4561.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
Abstract / Bemerkung
Recent experiments suggest that organic aerosol particles may transform into a glassy state at room temperature under dry conditions. Information on glass forming processes in mixed inorganic/organic aerosol particles is sparse, however, because inorganic crystal nucleation is usually very likely in such mixtures. Here we investigate the glass transition temperatures T-g of various organics (trehalose, sucrose, citric acid, sorbitol, and glycerol as well as 3-MBTCA) in binary mixtures with either NaNO3 or NH4HSO4 at different mass fractions. The glassy samples were prepared with the MARBLES technique by atomizing dilute aqueous solutions into aerosol particles and subsequent diffusion drying. The resulting aerosol particles were collected and their phase behavior was investigated using differential scanning calorimetry. At small and intermediate inorganic mass fractions salt crystallization did not occur. Instead, the single-phase mixtures remained in an amorphous state upon drying such that determination of their T-g was possible. From these measurements the T-g value of pure NaNO3 and pure NH4HSO4 could be inferred through extrapolation, resulting in values of T-g(NaNO3) approximate to 290 K and T-g(NH4HSO4) approximate to 220 K. Upon drying of NH4HSO4/3-MBTCA mixtures, phase-separated samples formed in which the inorganic-rich and organic-rich phases each show an independent glass transition. Our measurements provide a route toward establishing T-g values of inorganic salts that usually crystallize readily, and they may explain the reported contradicting observations of NaNO3 aerosol particles to either crystallize or remain amorphous upon drying at room temperature.
Erscheinungsjahr
Zeitschriftentitel
The Journal of Physical Chemistry A
Band
119
Zeitschriftennummer
19
Seite
4552-4561
ISSN
PUB-ID

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Dette HP, Koop T. Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles. The Journal of Physical Chemistry A. 2015;119(19):4552-4561.
Dette, H. P., & Koop, T. (2015). Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles. The Journal of Physical Chemistry A, 119(19), 4552-4561. doi:10.1021/jp5106967
Dette, H. P., and Koop, T. (2015). Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles. The Journal of Physical Chemistry A 119, 4552-4561.
Dette, H.P., & Koop, T., 2015. Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles. The Journal of Physical Chemistry A, 119(19), p 4552-4561.
H.P. Dette and T. Koop, “Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles”, The Journal of Physical Chemistry A, vol. 119, 2015, pp. 4552-4561.
Dette, H.P., Koop, T.: Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles. The Journal of Physical Chemistry A. 119, 4552-4561 (2015).
Dette, Hans Peter, and Koop, Thomas. “Glass Formation Processes in Mixed Inorganic/Organic Aerosol Particles”. The Journal of Physical Chemistry A 119.19 (2015): 4552-4561.

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Shiraiwa M, Li Y, Tsimpidi AP, Karydis VA, Berkemeier T, Pandis SN, Lelieveld J, Koop T, Pöschl U., Nat Commun 8(), 2017
PMID: 28429776
Thermodynamic and structural properties of binary calcium silicate glasses: insights from molecular dynamics.
Jabraoui H, Malki M, Hasnaoui A, Badawi M, Ouaskit S, Lebègue S, Vaills Y., Phys Chem Chem Phys 19(29), 2017
PMID: 28702537
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