About: What influences the acidity of the ice surface?

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The freezing of aqueous solutions of most of the organic compounds causes ice and solute molecules to separate at the surface of ice crystals. The ice surface acidity, or rather proton availability is thus an important but not well understood phenomenon. It was previously found that acidity increases in the frozen solutions of acids by three orders of magnitude compared to that of the corresponding solutions.1 Now we report that the acidity is altered by the presence of ions according to their distribution coefficients between the ice and unfrozen water layers. We determined their relative magnitudes and utilized molecular probes to evaluate the surface acidity using a UV-Vis diffuse reflectance spectroscopy. The observed acidity changes are then explained in terms of the Workman-Reynolds effect and eutectic compositions.2 (1) Heger, D.; Klanova, J.; Klan, P. Journal of Physical Chemistry B 2006, 110, 1277. (2) Workman, E. J.; Reynolds, S. E. Phys. Rev. 1950, 78, 254. The freezing of aqueous solutions of most of the organic compounds causes ice and solute molecules to separate at the surface of ice crystals. The ice surface acidity, or rather proton availability is thus an important but not well understood phenomenon. It was previously found that acidity increases in the frozen solutions of acids by three orders of magnitude compared to that of the corresponding solutions.1 Now we report that the acidity is altered by the presence of ions according to their distribution coefficients between the ice and unfrozen water layers. We determined their relative magnitudes and utilized molecular probes to evaluate the surface acidity using a UV-Vis diffuse reflectance spectroscopy. The observed acidity changes are then explained in terms of the Workman-Reynolds effect and eutectic compositions.2 (1) Heger, D.; Klanova, J.; Klan, P. Journal of Physical Chemistry B 2006, 110, 1277. (2) Workman, E. J.; Reynolds, S. E. Phys. Rev. 1950, 78, 254. (en)
Title	What influences the acidity of the ice surface? What influences the acidity of the ice surface? (en)
skos:prefLabel	What influences the acidity of the ice surface? What influences the acidity of the ice surface? (en)
skos:notation	RIV/00216224:14310/11:00050136!RIV12-GA0-14310___
http://linked.open...avai/predkladatel	Přírodovědecká fakulta
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GP203/09/P445)
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Klán, Petr Heger, Dominik Surman, František Krausková, Ľubica Filipová, Lenka
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	241695
http://linked.open...ai/riv/idVysledku	RIV/00216224:14310/11:00050136
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	freezing aqueous solution pH jump (en)
http://linked.open.../riv/klicoveSlovo	freezing aqueous solution pH jump
http://linked.open...ontrolniKodProRIV	[74ACA6637AF6]
http://linked.open...in/vavai/riv/obor	BJ
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Luminescence and Electrochemical Study of Compounds in Ice
http://linked.open...UplatneniVysledku	2011
http://linked.open...iv/tvurceVysledku	Klán, Petr Heger, Dominik Filipová, Lenka Krausková, Ľubica Surman, František
http://localhost/t...ganizacniJednotka	14310

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