IJS KOLOKVIJ, sreda, 02. 03. 2016; ob 13. uri; prof. dr. Alan K. Soper

[Primoz Ziherl]

Vabimo vas na 10. predavanje iz sklopa "Kolokviji na IJS" v letu 2015/16, ki bo v sredo, 02. marca 2016, ob 13. uri v Veliki predavalnici Instituta »Jožef Stefan«  na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu http://www.ijs.si/ijsw/Koledar_prireditev <http://www.ijs.si/ijsw/Koledar_prireditev>, posnetke preteklih predavanj pa na http://videolectures.net/kolokviji_ijs <http://videolectures.net/kolokviji_ijs>. 
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prof. dr. Alan K. Soper
Rutherford Appleton Laboratory, Didcot, Velika Britanija 
 
 
Druga kritična točka v podhlajeni vodi: Dejstvo ali utvara?
 
Značaj vode kot snovi je se naprej v osrčju mnogih razprav in protislovij. Visoko na seznamu protislovij je zamisel, da ima podhlajena voda drugo kritično točko, po katero, če seveda obstaja, bi se voda delila na dve različni kapljevinasti fazi, in sicer na visokogostotno in na nizkogostotno kapljevino. Čeprav druge kritične točke doslej še niso neposredno zaznali, je lani kljub teoretičnim in eksperimentalnim zadržkom strokovne javnosti izšel članek [Wang et al., J. Phys. Chem. Lett. 6, 2009 (2015)], v katerem avtorji trdijo, da so ta prehod opazili pri vodi, ujeti v porozno matriko iz kremenice, znano pod kratico MCM-41. Posvetili se bomo argumentum za in proti drugi kritični točki pri vodi in izpostavili dodatne dokaze, da ima ta scenarij resne pomanjkljivosti.

Predavanje bo v angleščini.

Lepo vabljeni!

 
 
 

We invite you to the 10th Institute colloquium in the academic year 2015/16. The colloquium will be held on Wednesday March 02, 2016 at 1 PM in the main Institute lecture hall, Jamova 39, Ljubljana. To read the abstract click  http://www.ijs.si/ijsw/Koledar_prireditev <http://www.ijs.si/ijsw/Koledar_prireditev>. Past colloquia are posted on  http://videolectures.net/kolokviji_ijs <http://videolectures.net/kolokviji_ijs>.
 
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prof. dr. Alan K. Soper
Rutherford Appleton Laboratory, Didcot, United Kingdom 
 
 
Second critical point in supercooled water: Fact or fiction?
 
 
The nature of water substance continues to attract a large amount of debate and controversy. High on the list of controversies is the idea that supercooled water has a second critical point, below which, if it existed, water would phase separate into two distinct liquids, high density liquid and low density liquid. Although no direct observation of this second critical point has been made to date, a paper last year [Wang et al., J. Phys. Chem. Lett. 6, 2009 (2015)] claimed to have observed this transition in water confined in a porous silica matrix, MCM-41. This was despite several theoretical and experimental objections that had been voiced before this work was published. This talk will look at the arguments for and against the second critical point scenario for water, and highlight yet further evidence that this scenario may have serious flaws.
 
Cordially invited!
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