Immersion freezing of supercooled water drops containing glassy volcanic ash particles

Autor:	Amy Gibbs, Alison C Rust, Walther Schwarzacher, Matthew Charman
Rok vydání:	2015
Předmět:	Ice nucleation Chemistry Drop (liquid) Analytical chemistry Nucleation Mineralogy Feldspar Volcanic glass law.invention Optical microscope law visual_art Immersion Ice nucleus visual_art.visual_art_medium General Earth and Planetary Sciences Supercooling Volcanic ash
Zdroj:	Gibbs, A, Charman, M, Schwarzacher, W & Rust, A C 2015, ' Immersion freezing of supercooled water drops containing glassy volcanic ash particles ', GeoResJ, vol. 7, pp. 66-69 . https://doi.org/10.1016/j.grj.2015.06.002
ISSN:	2214-2428
DOI:	10.1016/j.grj.2015.06.002
Popis:	The freezing temperatures of hundreds of water drops with radii 20–50 lm containing known average concentrations of suspended, mostly micron- to submicron-sized, volcanic ash particles composed of SiO2-rich glass were recorded using optical microscopy. As expected, the ash suppresses supercooling, and in contrast to earlier studies of much larger ash particles, the median freezing temperature clearly scales with the available ash surface area per drop. The heterogeneous nucleation rate coefficient per unit mass of ash (jm) increases exponentially with decreasing temperature (T) (increasing supercooling) with a possible change in the slope of a plot of log jm against T at T ¼ 245 � 1 K. Although uncertainties in the ash surface area limit quantitative comparisons, we conclude that volcanic glass is a less effective ice-nucleating agent than feldspar crystals and more similar to other minerals previously studied. 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b9b1af8693c2f8c05a274d76f0d4f64 https://doi.org/10.1016/j.grj.2015.06.002 Zobrazit plný text záznamu Full Text from ScienceDirect