| ONDRUŠKOVÁ, Gabriela, Lukáš VESELÝ, Jan ZEZULA, Johannes BACHLER, Thomas LOERTING a Dominik HEGER. Using Excimeric Fluorescence to Study How the Cooling Rate Determines the Behavior of Naphthalenes in Freeze-Concentrated Solutions: Vitrification and Crystallization. Journal of Physical Chemistry B. Washington, D.C.: American Chemical Society, 2020, roč. 124, č. 46, s. 10556-10566. ISSN 1520-6106. Dostupné z: https://dx.doi.org/10.1021/acs.jpcb.0c07817. |
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@article{1710036,
author = {Ondrušková, Gabriela and Veselý, Lukáš and Zezula, Jan and Bachler, Johannes and Loerting, Thomas and Heger, Dominik},
article_location = {Washington, D.C.},
article_number = {46},
doi = {http://dx.doi.org/10.1021/acs.jpcb.0c07817},
keywords = {Crystals; Fluorescence spectroscopy; Solution chemistry; Oligomers; Aromatic compounds},
language = {eng},
issn = {1520-6106},
journal = {Journal of Physical Chemistry B},
title = {Using Excimeric Fluorescence to Study How the Cooling Rate Determines the Behavior of Naphthalenes in Freeze-Concentrated Solutions: Vitrification and Crystallization},
url = {https://doi.org/10.1021/acs.jpcb.0c07817},
volume = {124},
year = {2020}
}
TY - JOUR
ID - 1710036
AU - Ondrušková, Gabriela - Veselý, Lukáš - Zezula, Jan - Bachler, Johannes - Loerting, Thomas - Heger, Dominik
PY - 2020
TI - Using Excimeric Fluorescence to Study How the Cooling Rate Determines the Behavior of Naphthalenes in Freeze-Concentrated Solutions: Vitrification and Crystallization
JF - Journal of Physical Chemistry B
VL - 124
IS - 46
SP - 10556-10566
EP - 10556-10566
PB - American Chemical Society
SN - 15206106
KW - Crystals
KW - Fluorescence spectroscopy
KW - Solution chemistry
KW - Oligomers
KW - Aromatic compounds
UR - https://doi.org/10.1021/acs.jpcb.0c07817
L2 - https://doi.org/10.1021/acs.jpcb.0c07817
N2 - We utilized fluorescence spectroscopy to learn about the molecular arrangement of naphthalene (Np) and 1-methylnaphthalene (MeNp) in frozen aqueous solutions. The freezing induces pronounced compound aggregation in the freeze-concentrated solution (FCS) in between the ice grains. The fluorescence spectroscopy revealed prevalent formation of a vitrified solution and minor crystallization of aromatic compounds. The FCS is shown as a specific environment, differing significantly from not only the pure compounds but also the ice surfaces. The results indicate marked disparity between the behavior of the Np and the MeNp; the cooling rate has a major impact on the former but not on the latter. The spectrum of the Np solution frozen at a faster cooling rate (ca 20 K/min) exhibited a temperature-dependent spectral behavior, whereas the spectrum of the solution frozen at a slower rate (ca 2 K/min) did not alter before melting. We interpret the observation through considering the varied composition of the FCS: Fast freezing leads to a higher water content expressed by the plasticizing effect, allowing molecular rearrangement, while slow cooling produces a more concentrated and drier environment. The experiments were conceived as generalizable for environmentally relevant pollutants and human-made freezing.
ER -
ONDRUŠKOVÁ, Gabriela, Lukáš VESELÝ, Jan ZEZULA, Johannes BACHLER, Thomas LOERTING a Dominik HEGER. Using Excimeric Fluorescence to Study How the Cooling Rate Determines the Behavior of Naphthalenes in Freeze-Concentrated Solutions: Vitrification and Crystallization. \textit{Journal of Physical Chemistry B}. Washington, D.C.: American Chemical Society, 2020, roč.~124, č.~46, s.~10556-10566. ISSN~1520-6106. Dostupné z: https://dx.doi.org/10.1021/acs.jpcb.0c07817.
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