Open AccessEnhancement and maximum in the isobaric specific-heat capacity measurements of deeply supercooled water using ultrafast calorimetry
Author(s) -
Harshad Pathak,
Alexander Späh,
Niloofar Esmaeildoost,
Jonas A. Sellberg,
Kyung Hwan Kim,
Fivos Perakis,
Katrin AmannWinkel,
Marjorie Ladd-Parada,
Jayanath Koliyadu,
Thomas J Lane,
Cheolhee Yang,
H. Lemke,
Alexander Roland Oggenfuss,
Philip J. M. Johnson,
Yunpei Deng,
Serhane Zerdane,
Roman Mankowsky,
P. Beaud,
Anders Nilsson
Publication year - 2021
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.2018379118
Subject(s) - supercooling , calorimetry , heat capacity , thermodynamics , isobaric process , evaporation , work (physics) , materials science , freezing point , water model , chemical physics , liquid water , chemistry , molecular dynamics , physics , computational chemistry
Significance The importance of molecular understanding of the structure, dynamics. and properties of liquid water is recognized in many scientific disciplines. Here, we study experimentally the structure and thermodynamics of bulk liquid water as it is supercooled by evaporation down to ∼228 K. The unique aspect of this work is the use of ultrafast calorimetry that enables us to determine the specific-heat capacity of water to unprecedentedly low temperatures. The observed maximum of about 218 J/mol/K at 229 K is consistent with the liquid–liquid critical point model and supports a proposed fragile-to-strong transition at ∼220 K to explain the steep decrease in the estimated self-diffusion coefficient below 235 K.