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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260307T025037Z
UID:https://www.mpsd.mpg.de/events/15343/42308
DTSTART:20180918T130000Z
DTEND:20180918T140000Z
CLASS:PUBLIC
CREATED:20180913T113749Z
DESCRIPTION:Water\, due to its unique hydrogen bonds\, is one of the materi
 als exhibiting diverse phases\, crystal morphologies\, and phase transform
 ation. As a result of interplay between environmental conditions and molec
 ular kinetics\, more than 25 crystalline and amorphous ices have been repo
 rted with various growing morphologies from polyhedron to needle. Dynamic 
 diamond anvil cell (dDAC)\, which may simply resolve the interference of m
 acroscopic driving force and microscopic kinetics by changing compression 
 rate\, is essential to study complex phase transition behaviour of water. 
 In the present study\, we haveinvestigated the effect of compression rate 
 on crystal growth and the multiple freezing-melting pathways of H2O under 
 far-from-equilibrium condition by using dDAC at room temperature. First\, 
 we reveal the origin of shock growth of ice VI single crystal. Under rapid
  compression (strain rate &gt\; ~0.1 /s)\, we observed a morphological tra
 nsition in ice VI growth from three-dimension (3-d) to twodimension (2-d) 
 with one-order higher growth speed. It is found that local growth conditio
 n and interface kinetics can be affected by compression rate\, which facil
 itate the 2-d shock growth. Secondly\, we explore five different pathways 
 of freezing and melting of deeply supercompressed water and ice via metast
 able phases. We will discuss the mechanism of freezing and melting by calc
 ulating driving force and interfacial free energy based on the classical n
 ucleation theory\, and comparing structure of supercompressed water and st
 able and metastable ices obtained from Raman spectroscopy.\nVortragende(r)
 : Yong-Jae Kim
LAST-MODIFIED:20180913T113749Z
LOCATION:CFEL (Bldg. 99)\, Raum: Seminar Room IV\, O1.111
ORGANIZER;CN=Andrea Cavalleri:mailto:
SUMMARY:MPSD Seminar: Study of pressure-induced abnormal ice growth and mul
 tipath water-ice transition with dynamic diamond anvil cell
URL;VALUE=URI:https://www.mpsd.mpg.de/events/15343/42308
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