The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Agne Swerin - One of the best experts on this subject based on the ideXlab platform.
-
New approaches for studying wood wettability and liquid penetration by using Wilhelmy Plate Method
2016Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:New approaches for studying wood wettability and liquid penetration by using Wilhelmy Plate Method
-
Wettability and swelling of acetylated and furfurylated wood analyzed by multicycle Wilhelmy Plate Method
Holzforschung, 2015Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:The wetting, dimensional stability and sorption properties of a range of modified wood samples obtained either by acetylation or furfurylation were compared with those of unmodified samples of the ...
-
Wettability and liquid sorption of wood investigated by Wilhelmy Plate Method
Wood Science and Technology, 2013Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:The wettability of Scots pine veneers was investigated with different approaches using the Wilhelmy Plate Method. The probe liquids were water and octane, which differ; in that, water is able to swell the wood sample, whereas octane does not. Novel approaches based on the Wilhelmy Plate Method to study wettability, liquid penetration, and swelling behavior of wood veneers are introduced. First, immersion to constant depth was performed, and liquid uptake with time was evaluated. Different kinetic regimes, the fastest one associated with contact angle changes and the slowest regime associated with liquid sorption by capillary and diffusion, were observed. Two other approaches, imbibition at constant depth (with initial deeper immersion) and full immersion, were utilized in order to keep the contact angle constant during measurements. Dynamic wettability studies were done by a multi-cycle (10–20 cycles) Wilhelmy Method. Based on this, the time-dependent swelling of wood and changes in sample perimeter could be obtained. Generally, water showed higher absorption than octane. In all wettability studies, and for both probe liquids, the penetration process starts with a fast initial sorption, which is followed by swelling in the case of water.
-
Multicycle Wilhelmy Plate Method for wetting properties, swelling and liquid sorption of wood.
Langmuir, 2013Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:A multicycle Wilhelmy Plate Method has been developed to investigate wetting properties, liquid sorption, and swelling of porous substrates such as wood. The use of the Method is exemplified by studies of wood veneers of Scots pine sapwood and heartwood, which were subjected to repeated immersion and withdrawal in a swelling liquid (water) and in a nonswelling liquid (octane). The swelling liquid changes the sample dimensions during measurements, in particular its perimeter. This, in turn, influences the force registered. A model based on a linear combination of the measured force and final change in sample perimeter is suggested, and validated to elucidate the dynamic perimeter change of wood veneer samples. We show that pine heartwood and pine sapwood differ in several respects in their interaction with water. Pine heartwood showed (i) lower liquid uptake, (ii) lower swelling, (iii) higher contact angle, and (iv) lower level of dissolution of surface active components (extractives) than pine sapwood. We conclude that the Method is also suitable for studying wetting properties of other porous and swellable materials. The wettability results were supported by surface chemical analysis using X-ray photoelectron spectroscopy, showing higher extractives and lignin content on heartwood than on sapwood surfaces.
-
Multicycle Wilhelmy Plate Method for Wetting Properties, Swelling and Liquid Sorption of Wood
2013Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus E.p. Wålinder, Agne SwerinAbstract:A multicycle Wilhelmy Plate Method has been developed to investigate wetting properties, liquid sorption, and swelling of porous substrates such as wood. The use of the Method is exemplified by studies of wood veneers of Scots pine sapwood and heartwood, which were subjected to repeated immersion and withdrawal in a swelling liquid (water) and in a nonswelling liquid (octane). The swelling liquid changes the sample dimensions during measurements, in particular its perimeter. This, in turn, influences the force registered. A model based on a linear combination of the measured force and final change in sample perimeter is suggested, and validated to elucidate the dynamic perimeter change of wood veneer samples. We show that pine heartwood and pine sapwood differ in several respects in their interaction with water. Pine heartwood showed (i) lower liquid uptake, (ii) lower swelling, (iii) higher contact angle, and (iv) lower level of dissolution of surface active components (extractives) than pine sapwood. We conclude that the Method is also suitable for studying wetting properties of other porous and swellable materials. The wettability results were supported by surface chemical analysis using X-ray photoelectron spectroscopy, showing higher extractives and lignin content on heartwood than on sapwood surfaces
Joao A P Coutinho - One of the best experts on this subject based on the ideXlab platform.
-
Surface Tension of Decane Binary and Ternary Mixtures with Eicosane, Docosane, and Tetracosane
Journal of Chemical & Engineering Data, 2005Co-Authors: Antonio J Queimada, Ana I Caco, Isabel M Marrucho, Joao A P CoutinhoAbstract:A tensiometer operating on the Wilhelmy Plate Method was employed to measure liquid-vapor interfacial tensions of three binary mixtures and one ternary mixture of decane with eicosane, docosane, and tetracosane. Tensions of binary mixtures n-C10H22 + n-C20H42, n-C10H22 + n-C22H46, and n-C10H22 + n-C24H50 and the ternary n-C10H22 + n-C20H42 + n-C24H50 were measured from 293.15 K (or above the solution melting temperature) up to 343.15 K. An average absolute deviation of 1.3% was obtained in comparison with pure component literature data. No mixture information for the reported systems was found in the literature. Results were modeled with a recently proposed corresponding states model. The average absolute deviation was found to be 1.2%.
-
Measurement and modeling of surface tensions of asymmetric systems: heptane, eicosane, docosane, tetracosane and their mixtures
Fluid Phase Equilibria, 2003Co-Authors: Antonio J Queimada, Ana I Caco, Isabel M Marrucho, Filipa A.e Silva, Joao A P CoutinhoAbstract:To extend the surface tension database for heavy or asymmetric n-alkane mixtures, measurements were performed using the Wilhelmy Plate Method. Measured systems included the binary mixtures heptane + eicosane, heptane + docosane and heptane + tetracosane and the ternary mixture heptane + eicosane + tetracosane at temperatures from 313.15 K (or above the melting point of the mixture) up to 343.15 K. All the measurements were performed at atmospheric pressure. Using these data, along with data previously measured by us and collected from the literature, a recently proposed corresponding states model was assessed. It is shown that using a new generalized combining rule for the critical temperature, the data can be described with deviations of about 1% that is within the experimental uncertainty of the measurements. © 2003 Elsevier B.V. All rights reserved.
-
surface tension of heptane decane hexadecane eicosane and some of their binary mixtures
Journal of Chemical & Engineering Data, 2002Co-Authors: Lara I Rolo, Ana I Caco, Antonio J Queimada, Isabel M Marrucho, Joao A P CoutinhoAbstract:Surface tension measurements were performed by the Wilhelmy Plate Method. Measured systems included pure heptane, decane, hexadecane, eicosane, and some of their binary mixtures at temperatures from 293.15 K to 343.15 K with an average absolute deviation of 1.6%. The results were compared with a new corresponding states model. The average absolute deviation was found to be 1.0%.
Magnus Wålinder - One of the best experts on this subject based on the ideXlab platform.
-
Liquid sorption and swelling behaviour of Norway spruce heartwood and sapwood veneers studied by the multicycle Wilhelmy Plate Method
2020Co-Authors: Tinh Sjökvist, Magnus Wålinder, Åsa BlomAbstract:The durability of coated wood in outdoor exposure is strongly influenced by the watersorption and liquid permeability properties of the wood substrate. Those properties mayalso influence the abilit ...
-
Liquid sorption characterisation of Norway spruce heartwood and sapwood using a multicycle Wilhelmy Plate Method
International Wood Products Journal, 2018Co-Authors: Tinh Sjökvist, Magnus Wålinder, Åsa BlomAbstract:A multicycle Wilhelmy Plate Method was applied to study the water and octane sorption behaviour of small Norway spruce veneers. Dry heart- and sapwood samples of varying density were investigated. ...
-
New approaches for studying wood wettability and liquid penetration by using Wilhelmy Plate Method
2016Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:New approaches for studying wood wettability and liquid penetration by using Wilhelmy Plate Method
-
Wettability and swelling of acetylated and furfurylated wood analyzed by multicycle Wilhelmy Plate Method
Holzforschung, 2015Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:The wetting, dimensional stability and sorption properties of a range of modified wood samples obtained either by acetylation or furfurylation were compared with those of unmodified samples of the ...
-
Wettability and liquid sorption of wood investigated by Wilhelmy Plate Method
Wood Science and Technology, 2013Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:The wettability of Scots pine veneers was investigated with different approaches using the Wilhelmy Plate Method. The probe liquids were water and octane, which differ; in that, water is able to swell the wood sample, whereas octane does not. Novel approaches based on the Wilhelmy Plate Method to study wettability, liquid penetration, and swelling behavior of wood veneers are introduced. First, immersion to constant depth was performed, and liquid uptake with time was evaluated. Different kinetic regimes, the fastest one associated with contact angle changes and the slowest regime associated with liquid sorption by capillary and diffusion, were observed. Two other approaches, imbibition at constant depth (with initial deeper immersion) and full immersion, were utilized in order to keep the contact angle constant during measurements. Dynamic wettability studies were done by a multi-cycle (10–20 cycles) Wilhelmy Method. Based on this, the time-dependent swelling of wood and changes in sample perimeter could be obtained. Generally, water showed higher absorption than octane. In all wettability studies, and for both probe liquids, the penetration process starts with a fast initial sorption, which is followed by swelling in the case of water.
Maziar Sedighi Moghaddam - One of the best experts on this subject based on the ideXlab platform.
-
Wettability of welded wood-joints investigated by the Wilhelmy Method : part 2. Effect of wollastonite additive
Holzforschung, 2020Co-Authors: Mojgan Vaziri, Maziar Sedighi Moghaddam, Olov Karlsson, Lars Abrahamsson, Dick SandbergAbstract:The effect of wollastonite on the wetting properties of welded Scots pine-joints was studied using the multicycle Wilhelmy Plate Method and by observation of the chemical composition of the welded ...
-
New approaches for studying wood wettability and liquid penetration by using Wilhelmy Plate Method
2016Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:New approaches for studying wood wettability and liquid penetration by using Wilhelmy Plate Method
-
Wettability and swelling of acetylated and furfurylated wood analyzed by multicycle Wilhelmy Plate Method
Holzforschung, 2015Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:The wetting, dimensional stability and sorption properties of a range of modified wood samples obtained either by acetylation or furfurylation were compared with those of unmodified samples of the ...
-
Wettability and liquid sorption of wood investigated by Wilhelmy Plate Method
Wood Science and Technology, 2013Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:The wettability of Scots pine veneers was investigated with different approaches using the Wilhelmy Plate Method. The probe liquids were water and octane, which differ; in that, water is able to swell the wood sample, whereas octane does not. Novel approaches based on the Wilhelmy Plate Method to study wettability, liquid penetration, and swelling behavior of wood veneers are introduced. First, immersion to constant depth was performed, and liquid uptake with time was evaluated. Different kinetic regimes, the fastest one associated with contact angle changes and the slowest regime associated with liquid sorption by capillary and diffusion, were observed. Two other approaches, imbibition at constant depth (with initial deeper immersion) and full immersion, were utilized in order to keep the contact angle constant during measurements. Dynamic wettability studies were done by a multi-cycle (10–20 cycles) Wilhelmy Method. Based on this, the time-dependent swelling of wood and changes in sample perimeter could be obtained. Generally, water showed higher absorption than octane. In all wettability studies, and for both probe liquids, the penetration process starts with a fast initial sorption, which is followed by swelling in the case of water.
-
Multicycle Wilhelmy Plate Method for wetting properties, swelling and liquid sorption of wood.
Langmuir, 2013Co-Authors: Maziar Sedighi Moghaddam, Per M. Claesson, Magnus Wålinder, Agne SwerinAbstract:A multicycle Wilhelmy Plate Method has been developed to investigate wetting properties, liquid sorption, and swelling of porous substrates such as wood. The use of the Method is exemplified by studies of wood veneers of Scots pine sapwood and heartwood, which were subjected to repeated immersion and withdrawal in a swelling liquid (water) and in a nonswelling liquid (octane). The swelling liquid changes the sample dimensions during measurements, in particular its perimeter. This, in turn, influences the force registered. A model based on a linear combination of the measured force and final change in sample perimeter is suggested, and validated to elucidate the dynamic perimeter change of wood veneer samples. We show that pine heartwood and pine sapwood differ in several respects in their interaction with water. Pine heartwood showed (i) lower liquid uptake, (ii) lower swelling, (iii) higher contact angle, and (iv) lower level of dissolution of surface active components (extractives) than pine sapwood. We conclude that the Method is also suitable for studying wetting properties of other porous and swellable materials. The wettability results were supported by surface chemical analysis using X-ray photoelectron spectroscopy, showing higher extractives and lignin content on heartwood than on sapwood surfaces.
Laurent Vonna - One of the best experts on this subject based on the ideXlab platform.
-
role of trapped air in the attachment of staphylococcus aureus on superhydrophobic silicone elastomer surfaces textured by a femtosecond laser
Langmuir, 2020Co-Authors: Mihaela Mateescu, Stephan Knopf, Frederic Mermet, Philippe Lavalle, Laurent VonnaAbstract:Surface texturing is an easy way to control wettability as well as bacterial adhesion. Air trapped in the surface texture of an immersed sample was often proposed as the origin of the low adhesion of bacteria to surfaces showing superhydrophobic properties. In this work, we identified two sets of femtosecond laser processing parameters that led to extreme superhydrophobic textures on a silicone elastomer but showed opposite behavior against Staphylococcus aureus (S. aureus, ATCC 25923) over a short incubation times (6 h). The main difference from most of the previous studies was that the air trapping was not evaluated from the extrapolation of the results of the classical sessile drop technique but from the drop rebound and Wilhelmy Plate Method. Additionally, all wetting tests were performed with bacteria culture medium and at 37 °C in the case of the Wilhelmy Plate Method. Following this approach, we were able to study the formation of the liquid/silicone interface and the associated air trapping for immersed samples that is, by far, most representative of the cell culture conditions than those associated with the sessile drop technique. Finally, the conversion of these superhydrophobic coatings into superhydrophilic ones revealed that air trapping is not a necessary condition to avoid Staphylococcus aureus retention on one of these two textured surfaces at short incubation times.
