TY  - GEN
A1  - Caupin, Frederic
A1  - Holten, Vincent
A1  - Qiu, Chen
A1  - Guillerm, Emmanuel
A1  - Wilke, Max
A1  - Frenz, Martin
A1  - Teixeira, Jose
A1  - Soper, Alan K.
T1  - Comment on "Maxima in the thermodynamic response and correlation functions of deeply supercooled water"
T2  - Science
N2  - Kim et al. recently measured the structure factor of deeply supercooled water droplets (Reports, 22 December 2017, p. 1589). We raise several concerns about their data analysis and interpretation. In our opinion, the reported data do not lead to clear conclusions about the origins of water’s anomalies.
Y1  - 2018
U6  - https://doi.org/10.1126/science.aat1634
SN  - 0036-8075
SN  - 1095-9203
VL  - 360
IS  - 6390
PB  - American Assoc. for the Advancement of Science
CY  - Washington
ER  - 
TY  - JOUR
A1  - Holten, Vincent
A1  - Qiu, Chen
A1  - Guillerm, Emmanuel
A1  - Wilke, Max
A1  - Ricka, Jaroslav
A1  - Frenz, Martin
A1  - Caupin, Frederic
T1  - Compressibility Anomalies in Stretched Water and Their Interplay with Density Anomalies
JF  - The journal of physical chemistry letters
N2  - Water keeps puzzling scientists because of its numerous properties which behave oppositely to those of usual liquids: for instance, water expands upon cooling, and liquid water is denser than ice. To explain this anomalous behavior, several theories have been proposed, with different predictions for the properties of supercooled water (liquid at conditions where ice is stable). However, discriminating between those theories with experiments has remained elusive because of spontaneous ice nucleation. Here we measure the sound velocity in liquid water stretched to negative pressure and derive an experimental equation of state, which reveals compressibility anomalies. We show by rigorous thermodynamic relations how these anomalies are intricately linked with the density anomaly. Some features we observe are necessary conditions for the validity of two theories of water.
Y1  - 2017
U6  - https://doi.org/10.1021/acs.jpclett.7b02563
SN  - 1948-7185
VL  - 8
SP  - 5519
EP  - 5522
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - GEN
A1  - Qiu, Chen
A1  - Krüger, Yves
A1  - Wilke, Max
A1  - Marti, Dominik
A1  - Rička, Jaro
A1  - Frenz, Martin
T1  - Exploration of the phase diagram of liquid water in the low-temperature metastable region using synthetic fluid inclusions
N2  - We present new experimental data of the low-temperature metastable region of liquid water derived from high-density synthetic fluid inclusions (996–916 kg m−3) in quartz. Microthermometric measurements include: (i) prograde (upon heating) and retrograde (upon cooling) liquid–vapour homogenisation. We used single ultrashort laser pulses to stimulate vapour bubble nucleation in initially monophase liquid inclusions. Water densities were calculated based on prograde homogenisation temperatures using the IAPWS-95 formulation. We found retrograde liquid–vapour homogenisation temperatures in excellent agreement with IAPWS-95. (ii) Retrograde ice nucleation. Raman spectroscopy was used to determine the nucleation of ice in the absence of the vapour bubble. Our ice nucleation data in the doubly metastable region are inconsistent with the low-temperature trend of the spinodal predicted by IAPWS-95, as liquid water with a density of 921 kg m−3 remains in a homogeneous state during cooling down to a temperature of −30.5 °C, where it is transformed into ice whose density corresponds to zero pressure. (iii) Ice melting. Ice melting temperatures of up to 6.8 °C were measured in the absence of the vapour bubble, i.e. in the negative pressure region. (iv) Spontaneous retrograde and, for the first time, prograde vapour bubble nucleation. Prograde bubble nucleation occurred upon heating at temperatures above ice melting. The occurrence of prograde and retrograde vapour bubble nucleation in the same inclusions indicates a maximum of the bubble nucleation curve in the ϱ–T plane at around 40 °C. The new experimental data represent valuable benchmarks to evaluate and further improve theoretical models describing the p–V–T properties of metastable water in the low-temperature region.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 327 
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-394993
ER  -