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Iceland spar calcite: Humidity and time effects on surface properties and their reversibility
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-6181-1347
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-6394-6990
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.ORCID iD: 0000-0003-1634-6789
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. Omya International AG, Switzerland.ORCID iD: 0000-0002-4746-6559
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2019 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 541, p. 42-55Article in journal (Refereed) Published
Abstract [en]

Understanding the complex and dynamic nature of calcite surfaces under ambient conditions is important for optimizing industrial applications. It is essential to identify processes, their reversibility, and the relevant properties of CaCO3 solid-liquid and solid-gas interfaces under different environmental conditions, such as at increased relative humidity (RH). This work elucidates changes in surface properties on freshly cleaved calcite (topography, wettability and surface forces) as a function of time (≤28 h) at controlled humidity (≤3–95 %RH) and temperature (25.5 °C), evaluated with atomic force microscopy (AFM) and contact angle techniques. In the presence of humidity, the wettability decreased, liquid water capillary forces dominated over van der Waals forces, and surface domains, such as hillocks, height about 7.0 Å, and trenches, depth about −3.5 Å, appeared and grew primarily in lateral dimensions. Hillocks demonstrated lower adhesion and higher deformation in AFM experiments. We propose that the growing surface domains were formed by ion dissolution and diffusion followed by formation of hydrated salt of CaCO3. Upon drying, the height of the hillocks decreased by about 50% suggesting their alteration into dehydrated or less hydrated CaCO3. However, the process was not entirely reversible and crystallization of new domains continued at a reduced rate.

Place, publisher, year, edition, pages
2019. Vol. 541, p. 42-55
Keywords [en]
Calcium carbonate minerals, Capillary forces, Humidity effects, Iceland spar calcite, Nanomechanical properties, Recrystallization, Reversibility of aging effects, Surface topography, Surface wettability, Van der Waals forces, Atomic force microscopy, Calcite, Calcium carbonate, Contact angle, Crystallization, Humidity control, Hydration, Phase interfaces, Surface properties, Wetting, Aging effects, Capillary force, Iceland spars, Nanomechanical property
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-37696DOI: 10.1016/j.jcis.2019.01.047Scopus ID: 2-s2.0-85060193864OAI: oai:DiVA.org:ri-37696DiVA, id: diva2:1284847
Note

 Funding details: Vetenskapsrådet, VR, 2015-05080; Funding text 1: Omya International AG provided financial funding of this research. Per M. Claesson acknowledges a grant from the Swedish Research Council (VR) [grant number 2015-05080 ].

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-06-17Bibliographically approved

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Wojas, NataliaSwerin, AgneWallqvist, VivecaJärn, Mikael

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