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Surface-Modified and Unmodified Calcite: Effects of Water and Saturated Aqueous Octanoic Acid Droplets on Stability and Saturated Fatty Acid Layer Organization
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-6181-1347
Karlstad University, Sweden.ORCID iD: 0000-0002-6394-6990
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0003-1634-6789
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0002-4746-6559
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2021 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 37, no 48, p. 14135-Article in journal (Refereed) Published
Abstract [en]

A profound understanding of the properties of unmodified and saturated fatty acid-modified calcite surfaces is essential for elucidating their resistance and stability in the presence of water droplets. Additional insights can be obtained by also studying the effects of carboxylic acid-saturated aqueous solutions. We elucidate surface wettability, structure, and nanomechanical properties beneath and at the edge of a deposited droplet after its evaporation. When calcite was coated by a highly packed monolayer of stearic acid, a hydrophilic region was found at the three-phase contact line. In atomic force microscopy mapping, this region is characterized by low adhesion and a topographical hillock. The surface that previously was covered by the droplet demonstrated a patchy structure of about 6 nm height, implying stearic acid reorganization into a patchy bilayer-like structure. Our data suggest that during droplet reverse dispensing and droplet evaporation, pinning of the three-phase contact line leads to the transport of dissolved fatty carboxylic acid and possibly calcium bicarbonate Ca(HCO3)2 molecules to the contact line boundary. Compared to the surface of intrinsically hydrophobic materials, such as polystyrene, the changes in contact angle and base diameter during droplet evaporation on stearic acid-modified calcite are strikingly different. This difference is due to stearic acid reorganization on the surface and transport to the water-air interface of the droplet. An effect of the evaporating droplet is also observed on unmodified calcite due to dissolution and recrystallization of the calcite surface in the presence of water. In the case where a water droplet saturated with octanoic acid is used instead of water, the stearic acid-coated calcite remains considerably more stable. Our findings are discussed in terms of the coffee-ring effect. © 2021 The Authors. 

Place, publisher, year, edition, pages
American Chemical Society , 2021. Vol. 37, no 48, p. 14135-
Keywords [en]
Calcite, Contact angle, Drops, Evaporation, Magnetic bubbles, Phase interfaces, Saturated fatty acids, Calcite surface, Droplet evaporation, Effect of water, Octanoic acids, Presence of water, Property, Reorganisation, Surface-modified, Three-phase contact line, Water droplets, Stearic acid
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:ri:diva-57359DOI: 10.1021/acs.langmuir.1c02387Scopus ID: 2-s2.0-85120076956OAI: oai:DiVA.org:ri-57359DiVA, id: diva2:1622528
Note

Funding text 1: This work was funded by the Omya International AG. A.S. is a researcher at Pro2BE at the Karlstad University, the research environment on Processes and Products for a Circular Biobased Economy.

Available from: 2021-12-22 Created: 2021-12-22 Last updated: 2023-06-08Bibliographically approved

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Wojas, NataliaSwerin, AgneWallqvist, VivecaJärn, Mikael

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