AI Article Synopsis
- Researchers studied low-entropy water clusters and small bulk water domains in a hydrophobic solvent across temperatures 235-333 K, using nuclear magnetic resonance spectroscopy.
- They identified singularity temperatures at around 300, 250, 235, and 225 K and proposed a model explaining these temperatures through tetrahedral structures and disordered normal-liquid structures in water.
- Findings indicated that as temperature decreased, low-entropy structures became more dominant, with all local water structures converging to a tetrahedral configuration below 225 K, and the phase transition rate significantly increasing at 235 K.
Article Abstract
The properties of low-entropy water clusters and small bulk water domains in a hydrophobic solvent over a wide temperature range (235-333 K), including supercooling temperatures, were investigated. H nuclear magnetic resonance spectroscopy showed singularity temperatures at ∼300, 250, 235, and 225 K. We proposed a model to understand these singularity temperatures in which the low-entropy water cluster is a locally favored tetrahedral structure (LFTS) and the small bulk water domain contains a mixture of disordered normal-liquid structure (DNLS) and LFTS. The model showed that the LFTS and DNLS populations change with applied temperature. Above ∼300 K, all local water structures become a DNLS. The population of LFTS increases with cooling and becomes dominant below ∼250 K. At ∼225 K, all local water structures converge to LFTS. The phase-transition rate of the low-entropy water clusters and small bulk water domains increases significantly at ∼235 K. The phase transition of the low-entropy water clusters showed primary ice nucleation. Low-entropy water clusters in a hydrophobic solvent are a unique water morphology and a probe material for water investigations.
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| http://dx.doi.org/10.1021/acs.jpclett.0c00631 | DOI Listing |
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