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Publications (10 of 18) Show all publications
Eriksson, M. & Swerin, A. (2020). Forces at superhydrophobic and superamphiphobic surfaces. Current Opinion in Colloid & Interface Science, 47, 46-57
Open this publication in new window or tab >>Forces at superhydrophobic and superamphiphobic surfaces
2020 (English)In: Current Opinion in Colloid & Interface Science, ISSN 1359-0294, E-ISSN 1879-0399, Vol. 47, p. 46-57Article, review/survey (Refereed) Published
Abstract [en]

Forces exerted at surfaces and interphases due to formation of gaseous (air or vapor) bridges describe the extreme liquid repellence in superhydrophobicity (SH) and amphiphobicity. The neighboring research areas of liquid capillary bridges and that of interactions between hydrophobic surfaces are highly valuable reference systems. We review recent findings with particular focus on the three-phase contact line and surface forces. Although macroscopic contact angles (>150°), low contact angle hysteresis (<10°, but can be high; parahydrophobic or petal type) and low roll-off angle (≤5–10°) are adequate criteria for SH and superamphiphobicity (SA) for most studies, a detailed understanding requires a view related to mechanisms. Experimental studies of liquid drop–substrate and particle–substrate adhesion in hydrophobic, SH, and SA systems are summarized by relating measured forces to the wetting tension, γcosθ. A low wetting tension value is a necessary but not sufficient criterion for SH and SA systems. The picture emerging from detailed force distance studies is that extreme liquid repellence in SH and SA systems is a progression of liquid repellence due to hydrophobicity, in which force curves can be explained by capillary forces of constant volume of the gaseous capillary. In SH and SA, neither the capillary force equation assuming constant volume nor constant pressure of the gaseous capillary explains experimental force measurements as the capillary increases in both volume and pressure. In recent experimental studies, a transition is observed into nonconstant volume and pressure which suggests an SH and SA wetting transition from constant volume or pressure to a capillary growth as driven by the γA and the PV works but also by forces at the three-phase contact SLV (solid-liquid-vapor) line, viz. pinning forces, Fpin and Fdepin, and line energy, (τL)SLV, terms. Supported by calculations of the different contributions, we suggest this transition being an appropriate definition for the onset of (appreciable) SH and SA.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Capillary force, Contact angle, Hydrophobicity, Laplace pressure, Line tension, Pinning, Superamphiphobicity, Superhydrophobicity, Surface force, Wetting
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-267779 (URN)10.1016/j.cocis.2019.11.012 (DOI)2-s2.0-85077750466 (Scopus ID)
Note

QC 20200304

Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04Bibliographically approved
Koppolu, R., Lahti, J., Abitbol, T., Swerin, A., Kuusipalo, J. & Toivakka, M. (2019). Continuous Processing of Nanocellulose and Polylactic Acid into Multilayer Barrier Coatings. ACS Applied Materials and Interfaces, 11(12), 11920-11927
Open this publication in new window or tab >>Continuous Processing of Nanocellulose and Polylactic Acid into Multilayer Barrier Coatings
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 12, p. 11920-11927Article in journal (Refereed) Published
Abstract [en]

Recent years have seen an increased interest toward utilizing biobased and biodegradable materials for barrier packaging applications. Most of the abovementioned materials usually have certain shortcomings that discourage their adoption as a preferred material of choice. Nanocellulose falls into such a category. It has excellent barrier against grease, mineral oils, and oxygen but poor tolerance against water vapor, which makes it unsuitable to be used at high humidity. In addition, nanocellulose suspensions' high viscosity and yield stress already at low solid content and poor adhesion to substrates create additional challenges for high-speed processing. Polylactic acid (PLA) is another potential candidate that has reasonably high tolerance against water vapor but rather a poor barrier against oxygen. The current work explores the possibility of combining both these materials into thin multilayer coatings onto a paperboard. A custom-built slot-die was used to coat either microfibrillated cellulose or cellulose nanocrystals onto a pigment-coated baseboard in a continuous process. These were subsequently coated with PLA using a pilot-scale extrusion coater. Low-density polyethylene was used as for reference extrusion coating. Cationic starch precoating and corona treatment improved the adhesion at nanocellulose/baseboard and nanocellulose/PLA interfaces, respectively. The water vapor transmission rate for nanocellulose + PLA coatings remained lower than that of the control PLA coating, even at a high relative humidity of 90% (38 degrees C). The multilayer coating had 98% lower oxygen transmission rate compared to just the PLA-coated baseboard, and the heptane vapor transmission rate reduced by 99% in comparison to the baseboard. The grease barrier for nanocellulose + PLA coatings increased 5-fold compared to nanocellulose alone and 2-fold compared to PLA alone. This approach of processing nanocellulose and PLA into multiple layers utilizing slot-die and extrusion coating in tandem has the potential to produce a barrier packaging paper that is both 100% biobased and biodegradable.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
Keywords
nanocellulose, polylactic acid, barrier coatings, roll-to-roll process, multilayer coatings
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-249810 (URN)10.1021/acsami.9b00922 (DOI)000462950600091 ()30829474 (PubMedID)2-s2.0-85063139115 (Scopus ID)
Note

QC 20190423

Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-12-20Bibliographically 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: 2019-12-20Bibliographically 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: 2019-12-20Bibliographically 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: 2019-12-20Bibliographically approved
Wärnheim, A., Toprak, M., Ahniyaz, A., Swerin, A. & Abitbol, T. (2019). Nanocellulose-based hybrid materials for optical applications. 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 >>Nanocellulose-based hybrid materials for optical applications
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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
American Chemical Society (ACS), 2019
National Category
Biomedical Laboratory Science/Technology
Identifiers
urn:nbn:se:kth:diva-257626 (URN)000478860502461 ()
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: 2019-12-20Bibliographically 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: 2019-12-20Bibliographically approved
Eriksson, M., Claesson, P. M., Jarn, M., Tuominen, M., Wallqvist, V., Schoelkopf, J., . . . Swerin, A. (2019). Wetting Transition on Liquid-Repellent Surfaces Probed by Surface Force Measurements and Confocal Imaging. Langmuir, 35(41), 13275-13285
Open this publication in new window or tab >>Wetting Transition on Liquid-Repellent Surfaces Probed by Surface Force Measurements and Confocal Imaging
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2019 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 35, no 41, p. 13275-13285Article in journal (Refereed) Published
Abstract [en]

Superhydrophobic surfaces in the Cassie-Baxter wetting state retain an air layer at the surface which prevents liquid water from reaching into the porous surface structure. In this work we explore how addition of ethanol, which reduces the surface tension, influences the wetting properties of superhydrophobic and smooth hydrophobic surfaces. Wetting properties are measured by dynamic contact angles, and the air layer at the superhydrophobic surface is visualized by laser scanning confocal microscopy. Colloidal probe atomic force microscopy measurements between a hydrophobic microsphere and the macroscopic surfaces showed that the presence of ethanol strongly affects the interaction forces. When the macroscopic surface is superhydrophobic, attractive forces extending up to a few micrometers are observed on retraction in water and in 20 vol % ethanol, signifying the presence of a large and growing gas capillary. Submicrometer attractive forces are observed between the probe particle and a smooth hydrophobic surface, and in this case a smaller gas capillary is formed. Addition of ethanol results in markedly different effects between superhydrophobic and hydrophobic surfaces. In particular, we show that the receding contact angle on the superhydrophobic surface is of paramount importance for describing the interaction forces.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-266002 (URN)10.1021/acs.langmuir.9b02368 (DOI)000491219300004 ()31547659 (PubMedID)2-s2.0-85073154274 (Scopus ID)
Note

QC 20191220

Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2019-12-20Bibliographically approved
Wojas, N., Swerin, A., Claesson, P. M., Wallqvist, V., Jarn, M., Gane, P., . . . Adam, M. (2018). Adsorption of water and gaseous species on calcite surfaces at different relative humidity and temperature. Paper presented at 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA. Abstract of Papers of the American Chemical Society, 255
Open this publication in new window or tab >>Adsorption of water and gaseous species on calcite surfaces at different relative humidity and temperature
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2018 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240173 (URN)000435537705728 ()
Conference
255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA
Note

QC 20181218

Available from: 2018-12-19 Created: 2018-12-19 Last updated: 2019-12-20Bibliographically approved
Swerin, A. (2018). Dimensional Scaling of Aqueous Ink Imbibition and Inkjet Printability on Porous Pigment Coated Paper-A Revisit. Industrial & Engineering Chemistry Research, 57(49), 16684-16691
Open this publication in new window or tab >>Dimensional Scaling of Aqueous Ink Imbibition and Inkjet Printability on Porous Pigment Coated Paper-A Revisit
2018 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 57, no 49, p. 16684-16691Article in journal (Refereed) Published
Abstract [en]

A recently published dimensional scaling of infiltration of water-based inkjet fluids was used to revisit published inkjet printability data on mineral-pigment-based, inkjet-receptive coated papers. The dimensional scaling was developed using simple fluids on homogeneous isotropic media and applied on uncoated papers using complex inkjet fluids but so far has not been related to printability. It is shown that the scaling can also work for coated papers using commercial dye- and pigment-based inks with a suggested relation to printability as given by the color gamut area, in which the primary factor is the product of permeability and capillary pressure. A successful scaling suggests that inkjet printability can be predicted from flow and materials parameters, namely, porosity, viscosity, imbibed volume, permeability, and capillary pressure, and would be of general applicability in other areas of inkjet printing. The results further imply the usefulness of the approach in other functional surface modification using waterborne procedures on hard or soft porous materials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240721 (URN)10.1021/acs.iecr.8b03868 (DOI)000453489000015 ()2-s2.0-85058090641 (Scopus ID)
Funder
VINNOVA, 2007-02402 2011-03362The Kempe Foundations
Note

QC 20190103

Available from: 2019-01-03 Created: 2019-01-03 Last updated: 2019-12-20Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6394-6990

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