Dielectric anomalous response of water at 60 °C

Martinez Maestro, L ORCID: https://orcid.org/0000-0001-6629-5313, del Valle, JC, Camarillo, E, Gonzalo, JA, Aragó, C, Marqués, M, Jaque, D, Lifante, G, García Solé, J, Santacruz-Gómez, K, Carrillo-Torres, RC and Jaque, F 2015, 'Dielectric anomalous response of water at 60 °C' , Philosophical Magazine, 95 (7) , pp. 683-690.

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Abstract

Recently, the paraelectric response of water was investigated in the range 0–100 °C. It showed an almost perfect Curie–Weiss behaviour up to 60 °C, but a slight change in slope of 1/εd versus T at 60 °C was overlooked. In this work, we report optical extinction measurements on metallic (gold and silver) nanoparticles dispersed in water, annealed at various temperatures in the range from 20 to 90 °C. An anomalous response at 60 °C is clearly detectable, which we associate to a subtle structural transformation in the water molecules at that temperature. This water anomaly is also manifested by means of a blue shift in the longitudinal surface plasmon resonance of the metallic nanoparticles for the solutions annealed at temperatures higher than about 60 °C. A reanalysis of 1/εd (T) for water in the whole temperature range leads us to conclude that the water molecule undergoes a subtle transformation from a low temperature (0–60 °C) configuration with a dipole moment μ1 = 2.18 D (close to the molecular dipole moment of ice) to a high temperature (60–100 °C) configuration with μ2 = 1.87 D (identical to the molecular dipole moment in water vapour).

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Philosophical Magazine
Publisher: Taylor & Francis
ISSN: 1478-6435
Related URLs:
Funders: Spanish Ministerio de Economía y Competitividad, DGPA-UNAM, Secretaría de Estado de Investigación Desarrollo e Innovación of the Spanish Ministerio de Economía y Competitividad
Depositing User: L Martinez Maestro
Date Deposited: 05 Dec 2019 15:34
Last Modified: 05 Dec 2019 15:34
URI: http://usir.salford.ac.uk/id/eprint/53254

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