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Wang, D., Zhao, J., Claesson, P. M., Christakopoulos, P., Rova, U., Matsakas, L., . . . Shi, Y. (2024). A strong enhancement of corrosion and wear resistance of polyurethane-based coating by chemically grafting of organosolv lignin. Materials Today Chemistry, 35, Article ID 101833.
Open this publication in new window or tab >>A strong enhancement of corrosion and wear resistance of polyurethane-based coating by chemically grafting of organosolv lignin
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2024 (English)In: Materials Today Chemistry, E-ISSN 2468-5194, Vol. 35, article id 101833Article in journal (Refereed) Published
Abstract [en]

Corrosion and wear pose significant challenges to equipment operating in harsh environments. Thus, protective coatings are needed. Anti-corrosion and anti-wear coatings are traditionally fossil-based and often contain environmentally harmful additives. Achieving anti-corrosion and anti-wear coatings based on environmentally benign and sustainable materials is important and a significant challenge. This work focused on the development of organosolv lignin-based polyurethane (OS_lignin-PU) coatings. The coatings were synthesised and evaluated for corrosion protection using electrochemical impedance spectroscopy (EIS) and for wear properties using nanoindentation and nano scratch measurements. EIS revealed that the optimal lignin content for corrosion protection purposes in the OS_lignin-PU coatings was 15 wt%. Moreover, addition of 15 wt% lignin to the OS_lignin-PU coatings also enhanced their wear resistance, as evidenced by reduced thickness loss during tribometer tests. The nano scratch measurements revealed that OS_lignin-PU coatings containing 15 wt% lignin exhibited the lowest scratch depth and friction coefficient. It is found that the developed lignin-containing coating exhibits remarkable corrosion and wear resistance, making it a promising sustainable material in various applications for pursuing sustainable development.

Place, publisher, year, edition, pages
Elsevier BV, 2024
Keywords
Anti-corrosion, Coating, Organosolv lignin, Polyurethane, Wear resistance
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-341607 (URN)10.1016/j.mtchem.2023.101833 (DOI)2-s2.0-85179131576 (Scopus ID)
Note

QC 20231227

Available from: 2023-12-27 Created: 2023-12-27 Last updated: 2024-02-12Bibliographically approved
Eriksson, M., Claesson, P. M., Jarn, M., Wallqvist, V., Tuominen, M., Kappl, M., . . . Swerin, A. (2024). Effects of Gas Layer Thickness on Capillary Interactions at Superhydrophobic Surfaces. Langmuir, 40(9), 4801-4810
Open this publication in new window or tab >>Effects of Gas Layer Thickness on Capillary Interactions at Superhydrophobic Surfaces
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2024 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 40, no 9, p. 4801-4810Article in journal (Refereed) Published
Abstract [en]

Strongly attractive forces act between superhydrophobic surfaces across water due to the formation of a bridging gas capillary. Upon separation, the attraction can range up to tens of micrometers as the gas capillary grows, while gas molecules accumulate in the capillary. We argue that most of these molecules come from the pre-existing gaseous layer found at and within the superhydrophobic coating. In this study, we investigate how the capillary size and the resulting capillary forces are affected by the thickness of the gaseous layer. To this end, we prepared superhydrophobic coatings with different thicknesses by utilizing different numbers of coating cycles of a liquid flame spraying technique. Laser scanning confocal microscopy confirmed an increase in gas layer thickness with an increasing number of coating cycles. Force measurements between such coatings and a hydrophobic colloidal probe revealed attractive forces caused by bridging gas capillaries, and both the capillary size and the range of attraction increased with increasing thickness of the pre-existing gas layer. Hence, our data suggest that the amount of available gas at and in the superhydrophobic coating determines the force range and capillary growth.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2024
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-344470 (URN)10.1021/acs.langmuir.3c03709 (DOI)001174403900001 ()38386540 (PubMedID)2-s2.0-85186451464 (Scopus ID)
Note

QC 20240318

Available from: 2024-03-18 Created: 2024-03-18 Last updated: 2024-03-18Bibliographically approved
Wang, D., Zhao, J., Claesson, P. M., Zhang, F., Pan, J. & Shi, Y. (2024). Green synergy: Eco-friendly, high-performance anti-corrosion and wear-resistant coatings utilizing organosolv lignin and polydimethylsiloxane. Progress in organic coatings, 190, Article ID 108365.
Open this publication in new window or tab >>Green synergy: Eco-friendly, high-performance anti-corrosion and wear-resistant coatings utilizing organosolv lignin and polydimethylsiloxane
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2024 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 190, article id 108365Article in journal (Refereed) Published
Abstract [en]

Corrosion and wear remain significant challenges for materials, causing substantial economic losses and safety risks. Anti-corrosion and anti-wear coatings provide an effective solution. However, traditional coatings are often fossil-based and contain heavy metals, posing environmental concerns. The drive for eco-friendly coatings has led to the exploration of green materials. This study combined lignin, an abundant organic material, and polydimethylsiloxane (PDMS), a known hydrophobic material, to address the challenges. Organosolv lignin was functionalised with (3-Aminopropyl)triethoxysilane (APTES), then chemically grafted on PDMS for the final coating synthesis. The optimised coating achieved through an eco-friendly process, exhibiting enhanced hydrophobicity and barrier properties, showing excellent long-term corrosion resistance in NaCl solution. The optimal coating formulation contained 15 wt% lignin and 40 wt% PDMS, demonstrating a high corrosion resistance (measured impedance of 1010 Ω·cm2), which remains effective even after 3 weeks of immersion in 1 M NaCl solution. This coating also showed good wear resistance, with a low friction coefficient evident from nano scratch tests.

Place, publisher, year, edition, pages
Elsevier BV, 2024
Keywords
Anti-corrosion, Coating, Organosolv lignin, Polydimethylsiloxane, Wear resistance
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-344599 (URN)10.1016/j.porgcoat.2024.108365 (DOI)001207347100001 ()2-s2.0-85187216477 (Scopus ID)
Note

QC 20240503

Available from: 2024-03-20 Created: 2024-03-20 Last updated: 2024-05-03Bibliographically approved
Wärnheim, A., Kotov, N., Dobryden, I., Telaretti Leggieri, R., Edvinsson, C., Heydari, G., . . . Claesson, P. M. (2024). Nanomechanical and nano-FTIR analysis of polyester coil coatings before and after artificial weathering experiments. Progress in organic coatings, 190, Article ID 108355.
Open this publication in new window or tab >>Nanomechanical and nano-FTIR analysis of polyester coil coatings before and after artificial weathering experiments
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2024 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 190, article id 108355Article in journal (Refereed) Published
Abstract [en]

Local heterogeneities can have significant effects on the performance of anti-corrosion coatings. Even small features can act as initiation points for damage and result in corrosion of the substrate material. Analysis methods with high spatial resolution and the ability to collect information relevant to crosslinking and degradation behavior of these coatings are therefore highly relevant. In this work, we demonstrate the utility of nanomechanical AFM measurements and nano-FTIR in investigating the nanoscale mechanical and chemical properties of two polyester coil coating clearcoats before and after weathering. On the nanoscale, weathering led to a stiffer and less deformable coating with less variation in the nanomechanical properties. Chemical degradation was quantified using changes in band ratios in the IR-spectra. Macro and nano-scale measurements showed similar trends with the latter measurements showing larger heterogeneity. Our results demonstrate the usefulness of the described analysis techniques and will pave the way for future studies of local properties in other coating systems and formulations.

Place, publisher, year, edition, pages
Elsevier BV, 2024
National Category
Materials Engineering
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-326839 (URN)10.1016/j.porgcoat.2024.108355 (DOI)001223181600001 ()2-s2.0-85188822290 (Scopus ID)
Funder
Swedish Foundation for Strategic Research, FID18-0034
Note

QC 20230522

Available from: 2023-05-12 Created: 2023-05-12 Last updated: 2024-05-27Bibliographically approved
Wojas, N., Tyrode, E., Corkery, R., Ernstsson, M., Wallqvist, V., Järn, M., . . . Claesson, P. M. (2023). Calcite Surfaces Modified with Carboxylic Acids (C2 to C18): Layer Organization, Wettability, Stability, and Molecular Structural Properties. Langmuir, 39(42), 14840-14852
Open this publication in new window or tab >>Calcite Surfaces Modified with Carboxylic Acids (C2 to C18): Layer Organization, Wettability, Stability, and Molecular Structural Properties
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2023 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 39, no 42, p. 14840-14852Article in journal (Refereed) Published
Abstract [en]

A fundamental understanding of the interactions between mineral surfaces and amphiphilic surface modification agents is needed for better control over the production and uses of mineral fillers. Here, we controlled the carboxylic acid layer formation conditions on calcite surfaces with high precision via vapor deposition. The properties of the resulting carboxylic acid layers were analyzed using surface-sensitive techniques, such as atomic force microscopy (AFM), contact angle measurements, angle resolved X-ray photoelectron spectroscopy (XPS), and vibrational sum-frequency spectroscopy. A low wettability was achieved with long hydrocarbon chain carboxylic acids such as stearic acid. The stearic acid layer formed by vapor deposition is initially patchy, but with increasing vapor exposure time, the patches grow and condense into a homogeneous layer with a thickness close to that expected for a monolayer as evaluated by AFM and XPS. The build-up process of the layer occurs more rapidly at higher temperatures due to the higher vapor pressure. The stability of the deposited fatty acid layer in the presence of a water droplet increases with the chain length and packing density in the adsorbed layer. Vibrational sum frequency spectroscopy data demonstrate that the stearic acid monolayers on calcite have their alkyl chains in an all-trans conformation and are anisotropically distributed on the plane of the surface, forming epitaxial monolayers. Vibrational spectra also show that the stearic acid molecules interact with the calcite surface through the carboxylic acid headgroup in both its protonated and deprotonated forms. The results presented provide new molecular insights into the properties of adsorbed carboxylic acid layers on calcite.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2023
National Category
Physical Chemistry Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:kth:diva-339501 (URN)10.1021/acs.langmuir.3c01252 (DOI)37824837 (PubMedID)2-s2.0-85175357225 (Scopus ID)
Note

QC 20231114

Available from: 2023-11-14 Created: 2023-11-14 Last updated: 2023-11-28Bibliographically approved
Eriksson, M., Claesson, P. M., Jaern, M., Wallqvist, V., Tuominen, M., Kappl, M., . . . Swerin, A. (2023). Effects of liquid surface tension on gas capillaries and capillary forces at superamphiphobic surfaces. Scientific Reports, 13(1)
Open this publication in new window or tab >>Effects of liquid surface tension on gas capillaries and capillary forces at superamphiphobic surfaces
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2023 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 13, no 1Article in journal (Refereed) Published
Abstract [en]

The formation of a bridging gas capillary between superhydrophobic surfaces in water gives rise to strongly attractive interactions ranging up to several micrometers on separation. However, most liquids used in materials research are oil-based or contain surfactants. Superamphiphobic surfaces repel both water and low-surface-tension liquids. To control the interactions between a superamphiphobic surface and a particle, it needs to be resolved whether and how gas capillaries form in non-polar and low-surface-tension liquids. Such insight will aid advanced functional materials development. Here, we combine laser scanning confocal imaging and colloidal probe atomic force microscopy to elucidate the interaction between a superamphiphobic surface and a hydrophobic microparticle in three liquids with different surface tensions: water (73 mN m(-1)), ethylene glycol (48 mN m(-1)) and hexadecane (27 mN m(-1)). We show that bridging gas capillaries are formed in all three liquids. Force-distance curves between the superamphiphobic surface and the particle reveal strong attractive interactions, where the range and magnitude decrease with liquid surface tension. Comparison of free energy calculations based on the capillary menisci shapes and the force measurements suggest that under our dynamic measurements the gas pressure in the capillary is slightly below ambient.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-329912 (URN)10.1038/s41598-023-33875-9 (DOI)000984431900042 ()37100810 (PubMedID)2-s2.0-85153917455 (Scopus ID)
Note

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-09-11Bibliographically approved
Simatos, D., Jacobs, I. E., Dobryden, I., Nguyen, M., Savva, A., Venkateshvaran, D., . . . Sirringhaus, H. (2023). Effects of Processing-Induced Contamination on Organic Electronic Devices. Small Methods, 7(11), Article ID 2300476.
Open this publication in new window or tab >>Effects of Processing-Induced Contamination on Organic Electronic Devices
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2023 (English)In: Small Methods, E-ISSN 2366-9608, Vol. 7, no 11, article id 2300476Article in journal (Refereed) Published
Abstract [en]

Organic semiconductors are a family of pi-conjugated compounds used in many applications, such as displays, bioelectronics, and thermoelectrics. However, their susceptibility to processing-induced contamination is not well understood. Here, it is shown that many organic electronic devices reported so far may have been unintentionally contaminated, thus affecting their performance, water uptake, and thin film properties. Nuclear magnetic resonance spectroscopy is used to detect and quantify contaminants originating from the glovebox atmosphere and common laboratory consumables used during device fabrication. Importantly, this in-depth understanding of the sources of contamination allows the establishment of clean fabrication protocols, and the fabrication of organic field effect transistors (OFETs) with improved performance and stability. This study highlights the role of unintentional contaminants in organic electronic devices, and demonstrates that certain stringent processing conditions need to be met to avoid scientific misinterpretation, ensure device reproducibility, and facilitate performance stability. The experimental procedures and conditions used herein are typical of those used by many groups in the field of solution-processed organic semiconductors. Therefore, the insights gained into the effects of contamination are likely to be broadly applicable to studies, not just of OFETs, but also of other devices based on these materials.

Place, publisher, year, edition, pages
Wiley, 2023
Keywords
contaminants, glovebox systems, organic electronics, pipettes, silicones, syringes, water uptake
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-348560 (URN)10.1002/smtd.202300476 (DOI)001057448200001 ()2-s2.0-85169419699 (Scopus ID)
Note

QC 20240626

Available from: 2024-06-26 Created: 2024-06-26 Last updated: 2024-06-26Bibliographically approved
Nguyen, M., Kraft, U., Tan, W. L., Dobryden, I., Broch, K., Zhang, W., . . . Sirringhaus, H. (2023). Improving OFF-State Bias-Stress Stability in High-Mobility Conjugated Polymer Transistors with an Antisolvent Treatment. Advanced Materials, 35(16), Article ID 2205377.
Open this publication in new window or tab >>Improving OFF-State Bias-Stress Stability in High-Mobility Conjugated Polymer Transistors with an Antisolvent Treatment
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2023 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 35, no 16, article id 2205377Article in journal (Refereed) Published
Abstract [en]

Conjugated polymer field-effect transistors are emerging as an enabling technology for flexible electronics due to their excellent mechanical properties combined with sufficiently high charge-carrier mobilities and compatibility with large-area, low-temperature processing. However, their electrical stability remains a concern. ON-state (accumulation mode) bias-stress instabilities in organic semiconductors have been widely studied, and multiple mitigation strategies have been suggested. In contrast, OFF-state (depletion mode) bias-stress instabilities remain poorly understood despite being crucial for many applications in which the transistors are held in their OFF-state for most of the time. Here, a simple method of using an antisolvent treatment is presented to achieve significant improvements in OFF-state bias-stress and environmental stability as well as general device performance for one of the best performing polymers, solution-processable indacenodithiophene-co-benzothiadiazole (IDT-BT). IDT-BT is weakly crystalline, and the notable improvements to an antisolvent-induced, increased degree of crystallinity, resulting in a lower probability of electron trapping and the removal of charge traps is attributed. The work highlights the importance of the microstructure in weakly crystalline polymer films and offers a simple processing strategy for achieving the reliability required for applications in flexible electronics.

Place, publisher, year, edition, pages
Wiley, 2023
Keywords
bias-stress effects, electron trapping, organic field-effect transistors, solvent treatments, stability
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-331098 (URN)10.1002/adma.202205377 (DOI)000947000600001 ()36373490 (PubMedID)2-s2.0-85149933640 (Scopus ID)
Note

QC 20230705

Available from: 2023-07-05 Created: 2023-07-05 Last updated: 2023-07-05Bibliographically approved
Wang, D., Zhao, J., Zhang, F., Claesson, P. M., Pan, J. & Shi, Y. (2023). In-situ coating wear condition monitoring based on solid-liquid triboelectric nanogenerator and its mechanism study. Nano Energy, 112, Article ID 108479.
Open this publication in new window or tab >>In-situ coating wear condition monitoring based on solid-liquid triboelectric nanogenerator and its mechanism study
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2023 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 112, article id 108479Article in journal (Refereed) Published
Abstract [en]

Various more or less wear-resistant coatings have been developed and used to protect metal substrates. However, the damage caused by wear is still a problem for most coatings. It is of great importance to monitor the wear of coatings in real-time during the applications. Recently reported wear monitoring methods (image processing, luminescent layers and the use of a sensing underlayer) require complex external equipment or additional coating preparation process steps, which limit their applications. As an emerging technology, a triboelectric nanogenerator (TENG) can convert mechanical energy into electricity, and it has been applied as a self-powered sensor. In this study, a new coating wear monitoring method is developed based on a solid-liquid TENG. The developed TENG generates electric signals corresponding to different wear states, which facilitates easy monitoring of the coating's wear conditions. The results show that the surface composition change caused by wear is the main reason affecting the TENG signal output. The coating-liquid contact-separation motion generates realtime output signals that directly reflect the coating wear states without the need of any additional equipment. This study provides a promising new technology for in-situ coating wear monitoring.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Triboelectric nanogenerator, in -situ monitoring, Coating, Wear
National Category
Chemical Engineering Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-329861 (URN)10.1016/j.nanoen.2023.108479 (DOI)000998596100001 ()2-s2.0-85154563802 (Scopus ID)
Note

QC 20230626

Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-06-26Bibliographically approved
Claesson, P. M., Wojas, N., Corkery, R., Dédinaité, A., Schoelkopf, J. & Tyrode, E. (2023). The dynamic nature of natural and fatty acid modified calcite surfaces. Physical Chemistry, Chemical Physics - PCCP, 26(4), 2780-2805
Open this publication in new window or tab >>The dynamic nature of natural and fatty acid modified calcite surfaces
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2023 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, PCCP - Physical Chemistry Chemical Physics, ISSN 1463-9076, Vol. 26, no 4, p. 2780-2805Article, review/survey (Refereed) Published
Abstract [en]

Calcium carbonate, particularly in the form of calcite, is an abundant mineral widely used in both human-made products and biological systems. The calcite surface possesses a high surface energy, making it susceptible to the adsorption of organic contaminants. Moreover, the surface is also reactive towards a range of chemicals, including water. Consequently, studying and maintaining a clean and stable calcite surface is only possible under ultrahigh vacuum conditions and for limited amounts of time. When exposed to air or solution, the calcite surface undergoes rapid transformations, demanding a comprehensive understanding of the properties of calcite surfaces in different environments. Similarly, attention must also be directed towards the kinetics of changes, whether induced by fluctuating environments or at constant condition. All these aspects are encompassed in the expression “dynamic nature”, and are of crucial importance in the context of the diverse applications of calcite. In many instances, the calcite surface is modified by adsorption of fatty acids to impart a desired nonpolar character. Although the binding between carboxylic acid groups and calcite surfaces is strong, the fatty acid layer used for surface modification undergoes significant alterations when exposed to water vapour and liquid water droplets. Therefore, it is also crucial to understand the dynamic nature of the adsorbed layer. This review article provides a comprehensive overview of the current understanding of both the dynamics of the calcite surface as well as when modified by fatty acid surface treatments.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC), 2023
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-348216 (URN)10.1039/d3cp04432g (DOI)001138420200001 ()38193529 (PubMedID)2-s2.0-85182385072 (Scopus ID)
Note

QC 20240624

Available from: 2024-06-24 Created: 2024-06-24 Last updated: 2024-06-24Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3207-1570

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