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Claesson, Per M.
Publications (10 of 34) Show all publications
He, Y., Boluk, Y., Pan, J., Ahniyaz, A., Deltin, T. & Claesson, P. M. (2019). Comparative study of CNC and CNF as additives in waterborne acrylate-based anti-corrosion coatings. Journal of Dispersion Science and Technology
Open this publication in new window or tab >>Comparative study of CNC and CNF as additives in waterborne acrylate-based anti-corrosion coatings
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2019 (English)In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351Article in journal (Refereed) Published
Abstract [en]

Nanocomposite coatings are of great interest as barrier coatings since synergy effects between matrix and additive properties can be achieved. This, however, requires favorable additive-matrix interactions to provide a strong interphase (interface region). In this work we elucidate the properties of two environmentally benign nanocomposite coatings based on a waterborne acrylate formulation with additives from renewable sources, i.e. either cellulose nanocrystals, CNC; or, alternatively, cellulose nanofibrils, CNF. We focus on the corrosion protective properties of these coatings and discuss the reason why the nanocomposite with CNC displays favorable corrosion protection properties whereas that with CNF does not. To this end we utilized scanning electron microscopy, water contact angle measurement, Fourier transform infrared spectroscopy and electrochemical impedance spectroscopy techniques to investigate the microstructure, surface wetting, interactions between cellulosic materials and matrix as well as corrosion protective properties of both composite coatings.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Composite coating, corrosion protection, cellulose nanocrystals, cellulose nanofibrils, electrochemical impedance spectroscopy
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-257650 (URN)10.1080/01932691.2019.1647229 (DOI)000479890700001 ()
Note

QC 20190904

Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-10-18Bibliographically approved
Kharitonov, D. S., Sommertune, J., Örnek, C., Ryl, J., Kurilo, I. I., Claesson, P. M. & Pan, J. (2019). Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy. CORROSION SCIENCE, 148, 237-250
Open this publication in new window or tab >>Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy
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2019 (English)In: CORROSION SCIENCE, Vol. 148, p. 237-250Article in journal (Refereed) Published
Abstract [en]

Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Aluminium, Alloy, Raman spectroscopy, SEM, XPS, Vanadate inhibitor
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-244484 (URN)10.1016/j.corsci.2018.12.011 (DOI)000457950400023 ()2-s2.0-85059158841 (Scopus ID)
Note

QC 20190321

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-04-04Bibliographically approved
He, Y., Boluk, Y., Pan, J., Ahniyaz, A., Deltin, T. & Claesson, P. M. (2019). Corrosion protective properties of cellulose nanocrystals reinforced waterborne acrylate-based composite coating. Corrosion Science, 155, 186-194
Open this publication in new window or tab >>Corrosion protective properties of cellulose nanocrystals reinforced waterborne acrylate-based composite coating
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2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 155, p. 186-194Article in journal (Refereed) Published
Abstract [en]

The present investigation highlights corrosion protection of carbon steel by a waterborne acrylate-based matrix coating, with and without reinforcement by cellulose nanocrystals, by using electrochemical impedance spectroscopy in 0.1 M NaCl solution over a period of 35 days. Interactions between cellulose nanocrystals and the matrix coating were demonstrated by Fourier transform infrared spectroscopy. The results show that both coatings have high barrier performance but different protective characteristics during long-term exposure. The differences can be attributed to the reinforcement effect of cellulose nanocrystals caused by hydrogen bonding interactions between cellulose nanocrystals and the matrix coating.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Waterborne organic coatings, Cellulose nanocrystals, Electrochemical impedance spectroscopy, IR spectroscopy, Interfaces, Corrosion protection performance
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-262694 (URN)10.1016/j.corsci.2019.04.038 (DOI)000471086500018 ()2-s2.0-85065617813 (Scopus ID)
Note

QC 20191018

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-18Bibliographically approved
Eriksson, M., Tuominen, M., Jarn, M., Claesson, P. M., Wallqvist, V., Butt, H. J., . . . Swerin, A. (2019). Direct Observation of Gas Meniscus Formation on a Superhydrophobic Surface. ACS Nano, 13(2), 2246-2252
Open this publication in new window or tab >>Direct Observation of Gas Meniscus Formation on a Superhydrophobic Surface
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2019 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 13, no 2, p. 2246-2252Article in journal (Refereed) Published
Abstract [en]

The formation of a bridging gas meniscus via cavitation or nanobubbles is considered the most likely origin of the submicrometer long-range attractive forces measured between hydrophobic surfaces in aqueous solution. However, the dynamics of the formation and evolution of the gas meniscus is still under debate, in particular, in the presence of a thin air layer on a superhydrophobic surface. On superhydrophobic surfaces the range can even exceed 10 mu m. Here, we report microscopic images of the formation and growth of a gas meniscus during force measurements between a superhydrophobic surface and a hydrophobic microsphere immersed in water. This is achieved by combining laser scanning confocal microscopy and colloidal probe atomic force microscopy. The configuration allows determination of the volume and shape of the meniscus, together with direct calculation of the Young-Laplace capillary pressure. The long-range attractive interactions acting on separation are due to meniscus formation and volume growth as air is transported from the surface layer.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
Keywords
superhydrophobicity, wetting, laser scanning confocal microscopy, AFM colloidal probe, capillary forces
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-247848 (URN)10.1021/acsnano.8b08922 (DOI)000460199400122 ()30707561 (PubMedID)2-s2.0-85061527266 (Scopus ID)
Note

QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-23Bibliographically approved
Dedinaite, A. & Claesson, P. M. (2019). How synergistic aqueous lubrication is mediated by natural and synthetic molecular aggregates. In: IOP Conference Series: Materials Science and Engineering. Paper presented at 18th International Conference Baltic Polymer Symposium 2018, BPS 2018, 12 September 2018 through 14 September 2018. Institute of Physics Publishing (1)
Open this publication in new window or tab >>How synergistic aqueous lubrication is mediated by natural and synthetic molecular aggregates
2019 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Nature lubricates in aqueous environment, and thus the example of a human synovial joint with its seamless function has been a fascination for scientists since the times of the birth of modern science. Here, inspired by nature, we investigate the mechanistic function of three different types of synergistic molecular aggregates. Firstly, we show how simple phospholipids lubricate hydrophilic model surfaces of silica and how this lubrication is facilitated further by the presence of an anionic polysaccharide, hyaluronan, due to the enhanced surface build-up of lubricant material. Next, we mimic natural polylectrolytesurfactant aggregation by employing a highly positively charged polyelectrolyte and anionic surfactant that strongly associate both in the bulk and at the surfaces by building structured aggregates that lubricate due to hydration lubrication. This occurs despite of the presence of strong attraction between the lubricated surfaces. This is an example of synergistic lubrication due to particular internal structural arrangement of the aggregates. Finally, we investigate the case of synergistic lubrication due to preferential surface ordering of two biological polyelectrolytes, cartilage oligomeric matrix protein and lubricin, that leads to favourable lubrication.

Place, publisher, year, edition, pages
Institute of Physics Publishing, 2019
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-255929 (URN)10.1088/1757-899X/500/1/012030 (DOI)2-s2.0-85064873793 (Scopus ID)
Conference
18th International Conference Baltic Polymer Symposium 2018, BPS 2018, 12 September 2018 through 14 September 2018
Note

QC 20190821

Available from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-08-21Bibliographically approved
Wojas, N., Swerin, A., Wallqvist, V., Jarn, M., Schoelkop, J., Gane, P. A. C. & Claesson, P. M. (2019). Iceland spar calcite: Humidity and time effects on surface properties and their reversibility. Journal of Colloid and Interface Science, 541, 42-55
Open this publication in new window or tab >>Iceland spar calcite: Humidity and time effects on surface properties and their reversibility
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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
Keywords
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:nbn:se:kth:diva-246229 (URN)10.1016/j.jcis.2019.01.047 (DOI)000460080700005 ()30682592 (PubMedID)2-s2.0-85060193864 (Scopus ID)
Note

QC 20190404

Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04Bibliographically approved
Zander, T., Wieland, D. C., Raj, A., Salmen, P., Dogan, S., Dédinaité, A., . . . Willumeit-Roemer, R. (2019). Influence of high hydrostatic pressure on solid supported DPPC bilayers with hyaluronan in the presence of Ca2+ ions. Soft Matter, 15(36), 7295-7304
Open this publication in new window or tab >>Influence of high hydrostatic pressure on solid supported DPPC bilayers with hyaluronan in the presence of Ca2+ ions
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2019 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 15, no 36, p. 7295-7304Article in journal (Refereed) Published
Abstract [en]

The molecular mechanisms responsible for outstanding lubrication of natural systems, like articular joints, have been the focus of scientific research for several decades. One essential aspect is the lubrication under pressure, where it is important to understand how the lubricating entities adapt under dynamic working conditions in order to fulfill their function. We made a structural investigation of a model system consisting of two of the molecules present at the cartilage interface, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and hyaluronan, at high hydrostatic pressure. Phospholipid layers are found at the cartilage surfaces and are able to considerably reduce friction. Their behavior under load and varied solution conditions is important as pressures of 180 bar are encountered during daily life activities. We focus on how divalent ions, like Ca2+, affect the interaction between DPPC and hyaluronan, as other investigations have indicated that calcium ions influence their interaction. It could be shown that already low amounts of Ca2+ strongly influence the interaction of hyaluronan with DPPC. Our results suggest that the calcium ions increase the amount of adsorbed hyaluronan indicating an increased electrostatic interaction. Most importantly, we observe a modification of the DPPC phase diagram as hyaluronan absorbs to the bilayer which results in an L-alpha-like structure at low temperatures and a decoupling of the leaflets forming an asymmetric bilayer structure.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-261946 (URN)10.1039/c9sm01066a (DOI)000487085700017 ()31483431 (PubMedID)2-s2.0-85072354344 (Scopus ID)
Note

QC 20191015

Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-15Bibliographically approved
Eriksson, M., Jarn, M., Tuominen, M., Wallqvist, V., Claesson, P. M., Teisala, H., . . . Swerin, A. (2019). Interactions at submerged liquid-repellent surfaces: Gas meniscus formation and development. Paper presented at National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL. Abstracts of Papers of the American Chemical Society, 257
Open this publication in new window or tab >>Interactions at submerged liquid-repellent surfaces: Gas meniscus formation and development
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2019 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 257Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:kth:diva-257621 (URN)000478860504588 ()
Conference
National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL
Note

QC 20190918

Available from: 2019-09-18 Created: 2019-09-18 Last updated: 2019-10-02Bibliographically approved
Niga, P., Hansson-Mille, P. M., Swerin, A., Claesson, P. M., Schoelkopf, J., Gane, P. A. C., . . . Johnson, C. M. (2019). Propofol adsorption at the air/water interface: a combined vibrational sum frequency spectroscopy, nuclear magnetic resonance and neutron reflectometry study. Soft Matter, 15(1), 38-46
Open this publication in new window or tab >>Propofol adsorption at the air/water interface: a combined vibrational sum frequency spectroscopy, nuclear magnetic resonance and neutron reflectometry study
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2019 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 15, no 1, p. 38-46Article in journal (Refereed) Published
Abstract [en]

Propofol is an amphiphilic small molecule that strongly influences the function of cell membranes, yet data regarding interfacial properties of propofol remain scarce. Here we consider propofol adsorption at the air/water interface as elucidated by means of vibrational sum frequency spectroscopy (VSFS), neutron reflectometry (NR), and surface tensiometry. VSFS data show that propofol adsorbed at the air/ water interface interacts with water strongly in terms of hydrogen bonding and weakly in the proximity of the hydrocarbon parts of the molecule. In the concentration range studied there is almost no change in the orientation adopted at the interface. Data from NR show that propofol forms a dense monolayer with a thickness of 8.4 angstrom and a limiting area per molecule of 40 angstrom(2), close to the value extracted from surface tensiometry. The possibility that islands or multilayers of propofol form at the air/water interface is therefore excluded as long as the solubility limit is not exceeded. Additionally, measurements of the 1H NMR chemical shifts demonstrate that propofol does not form dimers or multimers in bulk water up to the solubility limit.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-241311 (URN)10.1039/c8sm01677a (DOI)000454838800015 ()30516226 (PubMedID)2-s2.0-85058894693 (Scopus ID)
Note

QC 20190125

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-04-09Bibliographically approved
Claesson, P. M., Dobryden, I., He, Y. & Li, G. (2019). Surface Nanomechanics of Coatings and Hydrogels. In: IOP Conference Series: Materials Science and Engineering. Paper presented at 18th International Conference Baltic Polymer Symposium 2018, BPS 2018, 12 September 2018 through 14 September 2018. Institute of Physics Publishing (1)
Open this publication in new window or tab >>Surface Nanomechanics of Coatings and Hydrogels
2019 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Due to the increasing use of nanostructured materials and thin coatings as barrier materials, it has become of high importance to measure and understand material properties on the nm to 100 nm length scales. In this article we demonstrate and discuss how atomic force microscopy techniques can be used to this end. It is demonstrated that the classical analysis based on the assumption of a purely elastic material response is a fair approximation for relatively stiff coatings (elastic modulus order of GPa), whereas viscous responses must be considered for soft materials (apparent modulus order of MPa) such as hydrogels.

Place, publisher, year, edition, pages
Institute of Physics Publishing, 2019
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:kth:diva-255930 (URN)10.1088/1757-899X/500/1/012025 (DOI)2-s2.0-85064865835 (Scopus ID)
Conference
18th International Conference Baltic Polymer Symposium 2018, BPS 2018, 12 September 2018 through 14 September 2018
Note

QC 20190816

Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved
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