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Iceland spar calcite: Humidity and time effects on surface properties and their reversibility
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. RISE Res Inst Sweden, Div Biosci & Mat Surface Proc & Formulat, Box 5607, SE-11486 Stockholm, Sweden.ORCID iD: 0000-0002-6181-1347
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. RISE Res Inst Sweden, Div Biosci & Mat Surface Proc & Formulat, Box 5607, SE-11486 Stockholm, Sweden.
RISE Res Inst Sweden, Div Biosci & Mat Surface Proc & Formulat, Box 5607, SE-11486 Stockholm, Sweden..
RISE Res Inst Sweden, Div Biosci & Mat Surface Proc & Formulat, Box 5607, SE-11486 Stockholm, Sweden..
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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 degrees 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 angstrom, and trenches, depth about -3.5 angstrom, 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
ACADEMIC PRESS INC ELSEVIER SCIENCE , 2019. Vol. 541, p. 42-55
Keywords [en]
Iceland spar calcite, Calcium carbonate minerals, Humidity effects, Reversibility of aging effects, Recrystallization, Surface wettability, Surface topography, Nanomechanical properties, Capillary forces, Van der Waals forces
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246229DOI: 10.1016/j.jcis.2019.01.047ISI: 000460080700005PubMedID: 30682592Scopus ID: 2-s2.0-85060193864OAI: oai:DiVA.org:kth-246229DiVA, id: diva2:1302322
Note

QC 20190404

Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04Bibliographically approved

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Wojas, NataliaSwerin, AgneClaesson, Per M.

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