Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 2279-2288 |
| Number of pages | 10 |
| Journal | Crystal Growth and Design |
| Volume | 19 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 3 Apr 2019 |
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Understanding the hydration process of salts : the impact of a nucleation barrier. / Sögütoglu, Leyla; Steiger, M.; Houben, Jelle; Biemans, D.; Fischer, Hartmut R.; Donkers, Pim; Huinink, Henk (Corresponding author); Adan, Olaf.
In: Crystal Growth and Design, Vol. 19, No. 4, 03.04.2019, p. 2279-2288.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Understanding the hydration process of salts
T2 - the impact of a nucleation barrier
AU - Sögütoglu, Leyla
AU - Steiger, M.
AU - Houben, Jelle
AU - Biemans, D.
AU - Fischer, Hartmut R.
AU - Donkers, Pim
AU - Huinink, Henk
AU - Adan, Olaf
PY - 2019/4/3
Y1 - 2019/4/3
N2 - The solid-state hydration of salts has gained particular interest within the frame of thermochemical energy storage. In this work, the water vapor pressure–temperature (p–T) phase diagram of the following thermochemical salts was constructed by combining equilibrium and nonequilibrium hydration experiments: CuCl2, K2CO3, MgCl2·4H2O, and LiCl. The hydration of CuCl2 and K2CO3 involves a metastable zone of ca. 10 K, and the induction times preceding hydration are well-described by classical homogeneous nucleation theory. It is further shown for K2CO3 (metastable) and MgCl2·4H2O (not metastable) through solubility calculations that the phase transition is not mediated by bulk dissolution. We conclude that the hydration proceeds as a solid–solid phase transition, mobilized by a wetting layer, where the mobility of the wetting layer increases with increasing vapor pressure. In view of heat storage application, the finding of metastability in thermochemical salts reveals the impact of nucleation and growth processes on the thermochemical performance and demonstrates that practical aspects like the output temperature of a thermochemical salt are defined by its metastable zone width (MZW) rather than its equilibrium phase diagram. Manipulation of the MZW by e.g. prenucleation or heterogeneous nucleation is a potential way to raise the output temperature and power on material level in thermochemical applications.
AB - The solid-state hydration of salts has gained particular interest within the frame of thermochemical energy storage. In this work, the water vapor pressure–temperature (p–T) phase diagram of the following thermochemical salts was constructed by combining equilibrium and nonequilibrium hydration experiments: CuCl2, K2CO3, MgCl2·4H2O, and LiCl. The hydration of CuCl2 and K2CO3 involves a metastable zone of ca. 10 K, and the induction times preceding hydration are well-described by classical homogeneous nucleation theory. It is further shown for K2CO3 (metastable) and MgCl2·4H2O (not metastable) through solubility calculations that the phase transition is not mediated by bulk dissolution. We conclude that the hydration proceeds as a solid–solid phase transition, mobilized by a wetting layer, where the mobility of the wetting layer increases with increasing vapor pressure. In view of heat storage application, the finding of metastability in thermochemical salts reveals the impact of nucleation and growth processes on the thermochemical performance and demonstrates that practical aspects like the output temperature of a thermochemical salt are defined by its metastable zone width (MZW) rather than its equilibrium phase diagram. Manipulation of the MZW by e.g. prenucleation or heterogeneous nucleation is a potential way to raise the output temperature and power on material level in thermochemical applications.
UR - http://www.scopus.com/inward/record.url?scp=85063874845&partnerID=8YFLogxK
U2 - 10.1021/acs.cgd.8b01908
DO - 10.1021/acs.cgd.8b01908
M3 - Article
VL - 19
SP - 2279
EP - 2288
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 4
ER -