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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