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Yin, H., Ringman, R., Moghaddam, M. S., Tuominen, M., Dédinaité, A., Wålinder, M., . . . Bardage, S. (2023). Susceptibility of surface-modified superhydrophobic wood and acetylated wood to mold and blue stain fungi. Progress in organic coatings, 182, Article ID 107628.
Open this publication in new window or tab >>Susceptibility of surface-modified superhydrophobic wood and acetylated wood to mold and blue stain fungi
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2023 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 182, article id 107628Article in journal (Refereed) Published
Abstract [en]

The susceptibility of surface-modified wood, surface-modified acetylated wood and acetylated wood to mold and blue stain fungi was investigated. The surface modifications were based on fluorinated and non-fluorinated silicone nanofilaments for increased hydrophobicity. Results showed an increased mold resistance of the surface-modified superhydrophobic wood with mold appearing later or with less intensity on the modified surfaces than on the untreated wood in accelerated mold chamber tests due to the increased water resistance of the samples. All acetylated wood samples exhibited good mold resistance as the available water in acetylated wood was reduced. The surface modifications on acetylated wood had a slightly negative effect on mold resistance due to side effects from the modification. The surface-modified wood showed high blue stain fungi coverage, whereas almost no blue stain fungi were observed on the acetylated wood and surface-modified acetylated wood. The surface-modified superhydrophobic wood showed high mold coverage after conditioning in a high-humidity environment or after exposure to UV irradiation. Meanwhile, the acetylated wood and surface-modified superhydrophobic acetylated wood showed a small amount of mold coverage in these conditions.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Mold, Blue stain, Acetylated wood, Superhydrophobic surface modifications, Silicone nanofilaments
National Category
Wood Science
Identifiers
urn:nbn:se:kth:diva-328273 (URN)10.1016/j.porgcoat.2023.107628 (DOI)000989564000001 ()2-s2.0-85153096634 (Scopus ID)
Note

QC 20230607

Available from: 2023-06-07 Created: 2023-06-07 Last updated: 2023-06-07Bibliographically approved
Ernstsson, M., Dédinaité, A., Rojas, O. J. & Claesson, P. M. (2023). Two different approaches to XPS quantitative analysis of polyelectrolyte adsorption layers. Surface and Interface Analysis, 55(1), 26-40
Open this publication in new window or tab >>Two different approaches to XPS quantitative analysis of polyelectrolyte adsorption layers
2023 (English)In: Surface and Interface Analysis, ISSN 0142-2421, E-ISSN 1096-9918, Vol. 55, no 1, p. 26-40Article in journal (Refereed) Published
Abstract [en]

X-ray photoelectron spectroscopy (XPS) was employed to quantify adsorption of polyelectrolytes from aqueous solutions of low ionic strength onto mica, glass, and silica. Silica surfaces were conditioned in base or in acid media as last pre-treatment step (silica-base last or silica-acid last, respectively). Consistency in the determined adsorbed amount, Γ, was obtained independent of the choice of XPS mode and with the two quantification approaches used in the data evaluation. Under the same adsorption conditions, the adsorbed amount, Γ, varied as Γmica > Γsilica-base last ≈ Γglass > Γsilica-acid last. In addition, the adsorbed amount increased with decreasing polyelectrolyte charge density (100% to 1% of segments being charged) for all substrates. Large adsorbed amount was measured for low-charge density polyelectrolytes, but the number of charged segments per square nanometer was low due to steric repulsion between polyelectrolyte chains that limited the adsorption. The adsorbed amount of highly charged polyelectrolytes was controlled by electrostatic interactions and thus limited to that needed to neutralize the substrate surface charge density. For silica, the adsorbed amount depended on the cleaning method, suggesting that this process influenced surface concentration and fraction of different silanol groups. Our results demonstrate that for silica, a higher density and/or more acidic silanol groups are formed using base, rather than acid, treatment in the last step.

Place, publisher, year, edition, pages
Wiley, 2023
Keywords
adsorption, ESCA, glass, mica, polyelectrolyte, quantification, silica, surface conditioning, XPS, Ionic strength, Polyelectrolytes, Substrates, X ray photoelectron spectroscopy, Adsorbed amount, Adsorption layer, Low ionic strength, Polyelectrolyte adsorption, Silanol groups, Silica surface, Surface and interface analysis
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-328941 (URN)10.1002/sia.7154 (DOI)000878227300001 ()2-s2.0-85141359214 (Scopus ID)
Note

QC 20230614

Available from: 2023-06-14 Created: 2023-06-14 Last updated: 2023-06-14Bibliographically approved
Bełdowski, P., Przybyłek, M., Bełdowski, D., Dédinaité, A., Sionkowska, A., Cysewski, P. & Claesson, P. M. (2022). Collagen type II-hyaluronan interactions - the effect of proline hydroxylation: a molecular dynamics study. Journal of materials chemistry. B, 10(46), 9713-9723
Open this publication in new window or tab >>Collagen type II-hyaluronan interactions - the effect of proline hydroxylation: a molecular dynamics study
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2022 (English)In: Journal of materials chemistry. B, ISSN 2050-750X, E-ISSN 2050-7518, Vol. 10, no 46, p. 9713-9723Article in journal (Refereed) Published
Abstract [en]

Hyaluronan-collagen composites have been employed in numerous biomedical applications. Understanding the interactions between hyaluronan and collagen is particularly important in the context of joint cartilage function and the treatment of joint diseases. Many factors affect the affinity of collagen for hyaluronan. One of the important factors is the ratio of 3- or 4-hydroxy proline to proline residues. This article presents the results from molecular dynamics calculations of HA-collagen type II interactions with hyaluronan. The applied protocol employed docking and geometry optimization of complexes built using collagen structures with different numbers of hydroxyl groups attached to proline moieties. It was established that the hydroxyproline/proline ratio affects both structural and energetic features of the collagen-hyaluronan complex. Proline hydroxylation was found to significantly influence the number of all identified types of molecular forces, hydrophobic interactions, water bridges and hydrogen bonds, which can be formed between collagen and hyaluronan. Importantly, an increase in the hydroxyproline/proline ratio in the collagen chain increases the binding affinity for hyaluronan. This is illustrated by the linear correlation between the binding free energy and the hydroxylation degree. A comparison of the results obtained for 3 and 4 hydroxylation of proline indicates that the hydroxyl group attachment position plays a minor role in complex stabilization. However, a slightly stronger affinity was observed for 4 hydroxylation. In order to evaluate the effect of the aqueous environment on the collagen-hyaluronan complex stability, the enthalpic and entropic contributions to the free energy of solvation were analyzed.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2022
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-328854 (URN)10.1039/d2tb01550a (DOI)000890586000001 ()36413305 (PubMedID)2-s2.0-85142685417 (Scopus ID)
Note

QC 20230614

Available from: 2023-06-14 Created: 2023-06-14 Last updated: 2023-06-14Bibliographically approved
Li, S., Macakova, L., Beldowski, P., Claesson, P. M. & Dédinaité, A. (2022). Phospholipids and Hyaluronan: From Molecular Interactions to Nano- and Macroscale Friction. COLLOIDS AND INTERFACES, 6(3), Article ID 38.
Open this publication in new window or tab >>Phospholipids and Hyaluronan: From Molecular Interactions to Nano- and Macroscale Friction
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2022 (English)In: COLLOIDS AND INTERFACES, ISSN 2504-5377, Vol. 6, no 3, article id 38Article in journal (Refereed) Published
Abstract [en]

Phospholipids and hyaluronan are two key biomolecules that contribute to the excellent lubrication of articular joints. Phospholipids alone and in combination with hyaluronan have also displayed low friction forces on smooth surfaces in micro- and nanosized tribological contacts. In an effort to develop aqueous-based lubrication systems, it is highly relevant to explore if these types of molecules also are able to provide efficient lubrication of macroscopic tribological contacts involving surfaces with roughness larger than the thickness of the lubricating layer. To this end, we investigated the lubrication performance of hyaluronan, the phospholipid 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), and mixtures of these two components using glass surfaces in a mini-traction machine. We compared our data with those obtained using flat silica surfaces in previous atomic force microscopy studies, and we also highlighted insights on hyaluronan-phospholipid interactions gained from recent simulations. Our data demonstrate that hyaluronan alone does not provide any lubricating benefit, but DPPC alone and in mixtures with hyaluronan reduces the friction force by an order of magnitude.

Place, publisher, year, edition, pages
MDPI AG, 2022
Keywords
phospholipid, hyaluronan, mini-traction machine, lubrication, friction
National Category
Biochemistry and Molecular Biology Computational Mathematics Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-319831 (URN)10.3390/colloids6030038 (DOI)000858129600001 ()2-s2.0-85133138231 (Scopus ID)
Note

QC 20221012

Available from: 2022-10-12 Created: 2022-10-12 Last updated: 2022-10-12Bibliographically approved
Yin, H., Sedighi Moghaddam, M., Tuominen, M., Dédinaité, A., Wålinder, M. & Swerin, A. (2022). Wettability performance and physicochemical properties of UV exposed superhydrophobized birch wood. Applied Surface Science, 584, Article ID 152528.
Open this publication in new window or tab >>Wettability performance and physicochemical properties of UV exposed superhydrophobized birch wood
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2022 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 584, article id 152528Article in journal (Refereed) Published
Abstract [en]

The effect of prolonged ultraviolet (UV) irradiation on the performance of superhydrophobized birch and acetylated birch wood was investigated. The surface modification of the wood was based on a newly developed method using silicone nanofilaments. The combination of surface modification and acetylation of wood showed good wetting resistance also after 600 h of UV exposure, with water contact angles greater than 140 degrees and water uptake 30 times lower by weight than that of the non-surface-modified wood as determined by multicycle Wilhelmy plate measurements. Scanning electron microscopy images revealed that the silicone nanofilaments can still be observed on the wood samples after UV irradiation. The surface-modified wood samples exhibited significant color change after UV exposure. FTIR spectra showed that lignin was degraded on both the nonsurface-modified wood surfaces and the wood surface-modified with the silicone nanofilaments.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
UV irradiation, Superhydrophobicity, Acetylated wood, Surface modification, Lignin degradation, Wettability
National Category
Wood Science
Identifiers
urn:nbn:se:kth:diva-311303 (URN)10.1016/j.apsusc.2022.152528 (DOI)000773634800006 ()2-s2.0-85123687684 (Scopus ID)
Note

QC 20220422

Available from: 2022-04-22 Created: 2022-04-22 Last updated: 2023-02-12Bibliographically approved
Beldowski, P., Przybylek, M., Raczynski, P., Dédinaité, A., Gorny, K., Wieland, F., . . . Claesson, P. M. (2021). Albumin-Hyaluronan Interactions: Influence of Ionic Composition Probed by Molecular Dynamics. International Journal of Molecular Sciences, 22(22), Article ID 12360.
Open this publication in new window or tab >>Albumin-Hyaluronan Interactions: Influence of Ionic Composition Probed by Molecular Dynamics
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2021 (English)In: International Journal of Molecular Sciences, ISSN 1661-6596, E-ISSN 1422-0067, Vol. 22, no 22, article id 12360Article in journal (Refereed) Published
Abstract [en]

The lubrication mechanism in synovial fluid and joints is not yet fully understood. Nevertheless, intermolecular interactions between various neutral and ionic species including large macromolecular systems and simple inorganic ions are the key to understanding the excellent lubrication performance. An important tool for characterizing the intermolecular forces and their structural consequences is molecular dynamics. Albumin is one of the major components in synovial fluid. Its electrostatic properties, including the ability to form molecular complexes, are closely related to pH, solvation, and the presence of ions. In the context of synovial fluid, it is relevant to describe the possible interactions between albumin and hyaluronate, taking into account solution composition effects. In this study, the influence of Na+, Mg2+, and Ca2+ ions on human serum albumin-hyaluronan interactions were examined using molecular dynamics tools. It was established that the presence of divalent cations, and especially Ca2+, contributes mostly to the increase of the affinity between hyaluronan and albumin, which is associated with charge compensation in negatively charged hyaluronan and albumin. Furthermore, the most probable binding sites were structurally and energetically characterized. The indicated moieties exhibit a locally positive charge which enables hyaluronate binding (direct and water mediated).

Place, publisher, year, edition, pages
MDPI AG, 2021
Keywords
hyaluronic acid, hyaluronan, human serum albumin, molecular dynamics simulations, hydrogen bonds, water mediated interactions, ionic interactions
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-306569 (URN)10.3390/ijms222212360 (DOI)000727389000001 ()34830249 (PubMedID)2-s2.0-85118985208 (Scopus ID)
Note

QC 20211220

Available from: 2021-12-20 Created: 2021-12-20 Last updated: 2022-06-25Bibliographically approved
Dobryden, I., Steponaviciute, M., Hedman, D., Klimkevicius, V., Makuska, R., Dédinaité, A., . . . Claesson, P. M. (2021). Local Wear of Catechol-Containing Diblock Copolymer Layers: Wear Volume, Stick-Slip, and Nanomechanical Changes. The Journal of Physical Chemistry C, 125(38), 21277-21292
Open this publication in new window or tab >>Local Wear of Catechol-Containing Diblock Copolymer Layers: Wear Volume, Stick-Slip, and Nanomechanical Changes
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2021 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 125, no 38, p. 21277-21292Article in journal (Refereed) Published
Abstract [en]

Polymers containing catechol groups have gained a large interest, as they mimic an essential feature of mussel adhesive proteins that allow strong binding to a large variety of surfaces under water. This feature has made this class of polymers interesting for surface modification purposes, as layer functionalities can be introduced by a simple adsorption process, where the catechol groups should provide a strong anchoring to the surface. In this work, we utilize an AFM-based method to evaluate the wear resistance of such polymer layers in water and compare it with that offered by electrostatically driven adsorption. We pay particular attention to two block copolymer systems where the anchoring group in one case is an uncharged catechol-containing block and in the other case a positively charged and catechol-containing block. The wear resistance is evaluated in terms of wear volume, and here, we compare with data for similar copolymers with statistical distribution of the catechol groups. Monitoring of nanomechanical properties provides an alternative way of illustrating the effect of wear, and we use modeling to show that the stiffness, as probed by an AFM tip, of the soft layer residing on a hard substrate increases as the thickness of the layer decreases. The stick-slip characteristics are also evaluated.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-303898 (URN)10.1021/acs.jpcc.1c06859 (DOI)000704295900056 ()2-s2.0-85116679792 (Scopus ID)
Note

QC 20211022

Available from: 2021-10-22 Created: 2021-10-22 Last updated: 2022-06-25Bibliographically approved
Yin, H., Moghaddam, M. S., Tuominen, M., Dédinaité, A., Wålinder, M. & Swerin, A. (2021). Non-fluorine surface modification of acetylated birch for improved water repellence. Holzforschung, 75(9), 857-868
Open this publication in new window or tab >>Non-fluorine surface modification of acetylated birch for improved water repellence
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2021 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 75, no 9, p. 857-868Article in journal (Refereed) Published
Abstract [en]

In this work, a non-fluorinated surface treatment, i.e., hydrophobized silicone nanofilaments, was applied on both birch and acetylated birch wood samples via a gas-phase based reaction. A superhydrophobic behavior was observed on both the surface-modified samples as revealed by the static water contact angles (CAs) greater than 160 degrees, also valid for samples prepared with the shortest reaction time of 1 h. The dynamic wettability behavior of the samples was studied by a multicycle Wilhelmy plate method. The surface-modified acetylated birch exhibited a pronounced enhanced water resistance, resulting in very low water uptake of 3 +/- 1 wt% after 100 cycles, which was not only about 29 and 5 times lower than that of the non-surface-modified birch and acetylated birch, respectively, but also three times lower than that of the surface-modified birch. Moreover, the aesthetic appearance of the acetylated wood was maintained as the surface modification only resulted in a small color change. This work shows the potential of preparing super water-repellent wood by non-fluorinated surface modification.

Place, publisher, year, edition, pages
Walter de Gruyter GmbH, 2021
Keywords
acetylated wood, multicycle Wilhelmy plate method, non-fluorine surface modification, silicone nanofilaments, superhydrophobic coating
National Category
Wood Science
Identifiers
urn:nbn:se:kth:diva-301994 (URN)10.1515/hf-2020-0236 (DOI)000692441300008 ()2-s2.0-85104404837 (Scopus ID)
Note

QC 20210916

Available from: 2021-09-16 Created: 2021-09-16 Last updated: 2023-02-12Bibliographically approved
Yang, J., Liu, X., Tang, J., Dédinaité, A., Liu, J., Miao, R., . . . Fang, Y. (2021). Robust and Large-Area Calix[4]pyrrole-Based Nanofilms Enabled by Air/DMSO Interfacial Self-Assembly-Confined Synthesis. ACS Applied Materials and Interfaces, 13(2), 3336-3348
Open this publication in new window or tab >>Robust and Large-Area Calix[4]pyrrole-Based Nanofilms Enabled by Air/DMSO Interfacial Self-Assembly-Confined Synthesis
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2021 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 13, no 2, p. 3336-3348Article in journal (Refereed) Published
Abstract [en]

The modular construction of defect-free nanofilms with a large area remains a challenge. Herein, we present a scalable strategy for the preparation of calix[4]pyrrole (C[4]P)-based nanofilms through acryl hydrazone reaction conducted in a tetrahydrazide calix[4]pyrrole (CPTH)-based self-assembled layer at the air/DMSO interface. With this strategy, robust, regenerable, and defect-free nanofilms with an exceptionally large area (similar to 750 cm(2)) were constructed. The thickness and permeability of the film systems can be fine-tuned by varying the precursor concentration or by changing another building block. A typical nanofilm (C[4]P-TFB, similar to 67 nm) depicted high water flux (39.9 L m(2) h(-1) under 1 M Na2SO4), narrow molecular weight cut-off value (similar to 200 Da), and promising antifouling properties in the forward osmosis (FO) process. In addition, the nanofilms are stable over a wide pH range and tolerable to different organic solvents. Interestingly, the introduction of C[4]P endowed the nanofilms with both outstanding mechanical properties and unique group-selective separation capability, laying the foundation for wastewater treatment and pharmaceutical concentration.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
Keywords
calix[4]pyrrole, nanofilms, air/liquid interfacial self-assembly, forward osmosis, molecular separation
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-291783 (URN)10.1021/acsami.0c16831 (DOI)000612551400114 ()33356087 (PubMedID)2-s2.0-85099045093 (Scopus ID)
Note

QC 20210323

Available from: 2021-03-23 Created: 2021-03-23 Last updated: 2022-06-25Bibliographically approved
Zander, T., Garamus, V. M., Dédinaité, A., Claesson, P. M., Beldowski, P., Gorny, K., . . . Willumeit-Roemer, R. (2020). Influence of the Molecular Weight and the Presence of Calcium Ions on the Molecular Interaction of Hyaluronan and DPPC. Molecules, 25(17), Article ID 3907.
Open this publication in new window or tab >>Influence of the Molecular Weight and the Presence of Calcium Ions on the Molecular Interaction of Hyaluronan and DPPC
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2020 (English)In: Molecules, ISSN 1431-5157, E-ISSN 1420-3049, Vol. 25, no 17, article id 3907Article in journal (Refereed) Published
Abstract [en]

Hyaluronan is an essential physiological bio macromolecule with different functions. One prominent area is the synovial fluid which exhibits remarkable lubrication properties. However, the synovial fluid is a multi-component system where different macromolecules interact in a synergetic fashion. Within this study we focus on the interaction of hyaluronan and phospholipids, which are thought to play a key role for lubrication. We investigate how the interactions and the association structures formed by hyaluronan (HA) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) are influenced by the molecular weight of the bio polymer and the ionic composition of the solution. We combine techniques allowing us to investigate the phase behavior of lipids (differential scanning calorimetry, zeta potential and electrophoretic mobility) with structural investigation (dynamic light scattering, small angle scattering) and theoretical simulations (molecular dynamics). The interaction of hyaluronan and phospholipids depends on the molecular weight, where hyaluronan with lower molecular weight has the strongest interaction. Furthermore, the interaction is increased by the presence of calcium ions. Our simulations show that calcium ions are located close to the carboxylate groups of HA and, by this, reduce the number of formed hydrogen bonds between HA and DPPC. The observed change in the DPPC phase behavior can be attributed to a local charge inversion by calcium ions binding to the carboxylate groups as the binding distribution of hyaluronan and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine is not changed.

Place, publisher, year, edition, pages
MDPI AG, 2020
Keywords
phospholipid, hyaluronan, molecular interaction, phase behavior, binding distribution
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-283153 (URN)10.3390/molecules25173907 (DOI)000570338200001 ()32867196 (PubMedID)2-s2.0-85090106202 (Scopus ID)
Note

QC 20201006

Available from: 2020-10-06 Created: 2020-10-06 Last updated: 2023-08-28Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-2288-819X

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