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Supplementary data for the manuscript "Effect of chemically induced fracturing on the ice nucleation activity of alkali feldspar" by Kiselev et al., ACP 2021

Kiselev, Alexei; Keinert, Alice [Beteiligte*r]; Gaedeke, Tilia [Beteiligte*r]; Leisner, Thomas [Beteiligte*r] ORCID iD icon; Sutter, Christoph [Beteiligte*r]; Petrishcheva, Elena [Beteiligte*r]; Abart, Rainer [Beteiligte*r]

Abstract (englisch):

Feldspar is an important constituent of airborne mineral dust. Some alkali feldspars exhibit particularly high ice nucleation (IN) activity. This has been related to structural similarities of the ice (10-10) prism planes and the (100) planes of alkali feldspar. Here the effect of generating surfaces with close to (100) orientation by means of chemically induced fracturing on the IN activity of alkali feldspar was investigated experimentally. Gem quality K-rich alkali feldspar was shifted towards more Na-rich compositions by cation exchange with an NaCl-KCl salt melt at 850°C, and a system of parallel cracks with an orientation close to (100) was induced. Droplet freezing assay experiments performed on grain mounts of the cation exchanged alkali feldspars revealed an increase of the overall density of ice nucleating active sites (INAS) with respect to the untreated feldspar. In addition, annealing at 550°C subsequent to primary cation exchange further enhanced the INAS density and lead to IN activity at exceptionally high temperatures. Although very efficient in experiment, fracturing by cation exchange is unlikely to be of relevance in the conditioning of alkali feldspars in nature. ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF)
Publikationstyp Forschungsdaten
Publikationsdatum 28.07.2021
Erstellungsdatum 30.04.2021
Identifikator DOI: 10.5445/IR/1000132261
KITopen-ID: 1000132261
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Lizenz Creative Commons Namensnennung – Weitergabe unter gleichen Bedingungen 4.0 International
Schlagwörter Atmospheric ice, supercooled water, heterogeneous nucleation, mineral dust, rock-forming minerals, perthitic feldspar, crystallization of water, ice crystal growth
Liesmich

The data represented in Figure 3 and Figure 4 of the manuscript in the table form, for detailed explanation see text

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