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Academic literature on the topic 'Owens-Wendt model'
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Journal articles on the topic "Owens-Wendt model"
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MYRONYUK, Oleksiy, Denys BAKLAN, and Andrii NOVOSELTSEV. "EVALUATION OF THE SURFACE ENERGY OF SOLIDS USING TWO-COMPONENT MIXTURES OF TEST LIQUIDS." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 297, no. 3 (2021): 81–86. http://dx.doi.org/10.31891/2307-5732-2021-297-3-81-86.
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The design processes of composite materials require considering the surface energy of the phases. The choice of a series of test fluids to determine surface energy in the framework of the Zisman and Owens-Wendt models sometimes causes difficulties in the interaction of these fluids – dissolution or swelling of the substrate. The minimum number of test fluids is two, but more is used to increase accuracy. The use of mixed solvents allows to increase the number of experimental points, as well as to more accurately adjust the polarity of the medium, which is essential in determining the surface energy of substances that are unstable to the action of many solvents. The paper considered the possibility of using a mixture of a pair of test liquids that do not interact with the material and factors that may limit the accuracy of the determination. Also, on the example of stearic acid illustrates the process of determining surface energy by this method. Polypropylene and polycarbonate were chosen to determine the surface energy in the Owens-Wendt model. Test liquids used included water, ethylene glycol, dimethyl sulfoxide, ethanol, cyclohexane, glycerol and tetrahydrofuran. As a result, the use of a mixed solvent to determine the surface energy of polymers can increase the accuracy of the method by increasing the number of experimental points on the Owens-Wendt graph. Increase of the experimental points area, however, is limited to the points of individual solvents of the mixture, and the uncovered part of the graph needs to be corrected to reduce the error. It is shown that the use of only mixed solvents is inefficient due to the restriction of the zone of variability by the area between the coordinates of the individual solvents of the mixture. It has been shown that when determining the surface energy of materials that are not resistant to solvents, the accuracy can be increased by using mixed solvents, but this requires balancing the measurement range.
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Oleksiy, Myronyuk, Baklan Denys, and Nudchenko Lyudmyla. "EVALUATION OF THE SURFACE ENERGY OF DISPERSED ALUMINIUM OXIDE USING OWENS-WENDT THEORY." TECHNOLOGY AUDIT AND PRODUCTION RESERVES 2, no. 1(52) (2020): 25–27. https://doi.org/10.15587/2312-8372.2020.200756.
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<em>Knowing the value of the surface energy of powder materials allows to predict the interaction of the solid phase with liquids, the formation of stable dispersions, durable and resistant to aggressive factors of composites. The application of the Owens-Wendt model for determining the change in the surface energy of aluminium oxide modified by various water repellents is considered. Also, to determine the contact angle of the surface of the modified material, the Washburn method is used, which consists in determining the rate of capillary rise of the test fluid. This method is chosen due to low requirements in the accuracy of measuring equipment and at the same time shows a high degree of accuracy of the results.</em> <em>The object of research is a method for determining the surface energy of powder materials, using aluminium oxide modified with polymethylhydrosiloxane as an example. Surface modifications of the aluminium oxide powder are carried out in a xylene suspension.</em> <em>In the work, the determination of surface energy is carried out in accordance with the Owens-Wendt theory by the graphical method in accordance with the obtained values of the contact angle of the material according to the Washburn method. It is established the shape of the particles of aluminium oxide and their average size, and also calculated the specific surface of the material. A modifier, polymethylhydrosiloxane, is found, with the help of which it is possible to obtain a stable superhydrophobic state, and the optimal concentration by determining the contact angles of the powder material with test liquids according to the method proposed by Washburn.</em> <em>To increase the accuracy of determining the surface energy of the material according to the Washburn method, a mixture of water with ethanol is used, and the components of surface tension are calculated. It is shown that the values of the contact angle of the surface of the dispersed material obtained using a mixture as a test liquid can be used to calculate the values of the components of the surface energy of aluminium oxide. In this case, there is a lack of error in the form of the Cassie state, which is observed for hydrophobic dispersed materials when using water as a test fluid.</em>
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Yarce, Cristhian, Juan Echeverri, and Constain Salamanca. "Effect of the Surface Hydrophobicity Degree on the In Vitro Release of Polar and Non-Polar Drugs from Polyelectrolyte Matrix Tablets." Polymers 10, no. 12 (2018): 1313. http://dx.doi.org/10.3390/polym10121313.
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This work is the continuation of a series of studies focused on establishing the relationship between the surface thermodynamic properties of polyelectrolyte matrix tablets and drug release mechanisms. In this case, two model drugs with different polarity features, such as carbamazepine (non-polar) and metoprolol succinate (polar) were used in combination with polymeric material hydroxypropyl-methyl cellulose (HPMC) and two polyelectrolytes derived from maleic anhydride corresponding to the sodium salts of poly(maleic acid-alt-ethylene) and poly(maleic acid-alt-octadecene) named PAM-0Na and PAM-18Na, respectively. The polymers were obtained and characterized as reported previously. Surface studies were performed by the sessile drop method, whilst the surface free energy was determined through Owens, Wendt, Rable and Kaeble (OWRK) semi-empirical model. By contrast, the drug release studies were performed by in vitro dissolution tests, where data were analyzed through dissolution efficiency. The results showed that, depending on the drug polarity, type and polymer proportion, surface properties and drug release processes are significantly affected.
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Georgiev, Georgi As, Stanislav Baluschev, Petar Eftimov, Mihaela Bacheva, and Katharina Landfester. "Addressing the Apparent Controversies Between the Contact Angle-Based Models for Estimation of Surface Free Energy: A Critical Review." Colloids and Interfaces 8, no. 6 (2024): 62. http://dx.doi.org/10.3390/colloids8060062.
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The most popular contact angle (CA)-based approaches for determination of solid surface free energy (SFE) are considered: (i) single liquid methods, mainly of Neumann and Chibowski, (ii) the multiple liquids approach of Owens–Wendt–Rabel–Kaelble (OWRK), and (iii) van Oss-Chaudhury–Good (vOCG) acid–base model. Evaluations based on Neumann and Chibowski models agree between each other. Under the assumption of equilibrium “wet wetting” (i.e., presence of saturated precursor film ahead of the drop), the model of Chibowski transforms in Lipatov’s interfacial equilibrium rule, i.e., the Antonow rule derived for the ternary point solid–liquid–gas. Very good agreement is observed between single and multiple liquids models where OWRK/vOCG values can be viewed as a mean of the individual SFE adopted by the solid with each of the wetting probes. Both approaches (single and multiple liquids) can be used in conjunction to evaluate SFE dispersion and polar components and to elucidate hydrophobicity and hydrophilicity. The implementation of apparently fully non-polar liquids (diiodomethane, bromonaphthalene) in OWRK and vOCG is practically and theoretically suspect. CA-based estimates represent apparent SFE determined by the interactions of both the solid surface and the probing liquid, which are very useful to elucidate the energy, chemistry and dynamics of the solid surface.
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Brleković, Filip, Katarina Mužina, and Stanislav Kurajica. "The Influence of Alkaline Pretreatment of Waste Nutshell for Use in Particulate Biocomposites." Journal of Composites Science 8, no. 1 (2024): 26. http://dx.doi.org/10.3390/jcs8010026.
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The aim of this work was to determine how different types of alkaline pretreatment influence the properties of waste almond and hazelnut nutshell, as well as their compatibility with model inorganic geopolymer matrixes for the formation of biocomposites with potential use in civil engineering. For alkaline pretreatment, 3, 6 and 9% NaOH water solutions and milk of lime were used under different temperature and time conditions. The rise in the crystallinity index was confirmed by X-ray powder diffraction analysis, while the corroboration of the removal of amorphous and undesirable components was demonstrated through Fourier-transform infrared spectroscopy. Furthermore, the effectiveness of the pretreatments was confirmed via simultaneous differential thermal and thermogravimetric analysis, and the positive change in the morphology of the surface of the waste nutshell (WN) and the deposition of the desired phases was established using scanning electron microscopy. Surface free energy and adhesion parameters were calculated using the Owens, Wendt, Rabel and Kaelble method for WN as fillers and geopolymers as model novel inorganic binders. This research indicates that the 6% NaOH treatment is the optimal pretreatment process for preparing WN as the filler in combination with potassium and metakaolin geopolymer that has been cured at room temperature.
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Ha, Jung-Hong, Hyeon-Cheol Kim, Young Kim, and Tae-Yub Kwon. "An Evaluation of Wetting and Adhesion of Three Bioceramic Root Canal Sealers to Intraradicular Human Dentin." Materials 11, no. 8 (2018): 1286. http://dx.doi.org/10.3390/ma11081286.
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Root canal sealers should have good wetting and adhesion with intraradicular dentin. This study evaluated the wetting and adhesion properties of three bioceramic root canal sealers on dentin using contact angle (CA) measurements and calculations based on the Owens–Wendt–Rabel–Kälble (OWRK) model and compared the properties with those of a resin sealer. Three bioceramic sealers (EndoSequence BC Sealer (BC); Endoseal MTA (EM); and MTA Fillapex (MF)) were tested, together with one epoxy resin-based sealer (AH Plus (AP)). Disc-shaped sealer specimens and human premolar teeth with flat and polished intraradicular dentin surfaces were prepared (n = 12). The CAs of two liquids (water and methylene iodide) were measured on the surfaces using the sessile drop method. The wetting and adhesion properties of the four sealers were calculated using the wetting envelope and isogram diagram, respectively. Group BC showed the best wettability among the four sealer groups. The best adhesion was achieved for group EM, followed by group BC, with a significant difference being present between the two groups (p < 0.05). The OWRK-based calculation indicated that the bioceramic BC and EM sealers showed superior wetting and adhesion properties to the AP sealers.
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Daugbjerg, Thomas Schrøder, Loïc Crouzier, Alexandra Delvallée, et al. "Measurement of wettability and surface roughness for metrology and quality control in microfluidics." International Journal of Metrology and Quality Engineering 16 (2025): 2. https://doi.org/10.1051/ijmqe/2024021.
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Microfluidics is a rapidly growing technology with applications in biochemistry and life sciences. To support the ongoing growth there is a need for common metrology, quality control, and standardisation. Here measurements of wettability and surface roughness can contribute, and these quantities affect flow characteristics of devices, bonding processes in manufacturing, and special microfluidic mechanisms such as droplet formation and spreading of fluids on surfaces. To quantify wettability, an optical laboratory setup was used to measure liquid drop contact angles of three liquids on a microfluidic surface. To further quantify wettability, the Owens, Wendt, Rabel, and Kaelble model was applied to contact angle measurements to determine the total surface free energy. To quantify surface roughness, atomic force microscopy and stylus profilometry measured area roughness parameter and profile roughness parameter for four samples of microfluidic surfaces. The wettability methods successfully demonstrated measurements of contact angles, and these methods were applied to determine a value for the total surface free energy. AFM and stylus profilometry successfully determined surface roughness parameters, and the determined values agreed with the expected for the material. In conclusion, the demonstrated methods can contribute to metrology, quality control and standardisation in microfluidics.
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Tian, Yuexin, Yintao Liu, Haifeng Dong, Xiangjun Liu, and Jinjun Huang. "Revealing a Wetting–Penetration–Interlocking Mechanism for the Interfacial Reinforcement of Degradable Liquid Plugs via Silane-Induced Microstructure Engineering." Polymers 17, no. 12 (2025): 1660. https://doi.org/10.3390/polym17121660.
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Hypothesis: Poor interfacial bonding and wetting incompatibility limit the performance of degradable liquid plugs under high-pressure conditions. It is hypothesized that silane-induced interfacial engineering can build a multiscale structure that enhances adhesion via coupled wetting, penetration, and interlocking mechanisms. Experiments: A C18 silane-modified steel surface was constructed and tested for its bonding behavior with an epoxy-based degradable plug. Interfacial strength, compressive capacity, and microstructure were analyzed using mechanical tests, SEM, AFM, and contact angle measurements. Surface energy was calculated via the Owens–Wendt model. Findings: The silane-treated interface exhibited a significant enhancement in interfacial bonding strength (up to 445%) and shear strength (73.8% increase), attributed to the formation of a 391.6 nm thick infiltrated interlayer and strong chemical anchoring (Si–O–Fe bonds). Contact angle decreased from 74.0° to 53.6°, with interfacial energy increasing by 26.2%, confirming improved wettability and energy compatibility. A triadic enhancement pathway of “wetting–penetration–interlocking” was established, supported by microstructural imaging and theoretical modeling. This work provides mechanistic insights and practical guidance for the design of robust liquid plug systems in complex wellbore environments.
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DANILOV, V. E., E. V. KOROLEV, A. M. AYZENSHTADT, and V. V. STROKOVA. "Features of the Calculation of Free Energy of the Surface Based on the Model for Interfacial Interaction of Owens–Wendt–Rabel–Kaelble." Stroitel'nye Materialy 776, no. 11 (2019): 66–72. http://dx.doi.org/10.31659/0585-430x-2019-776-11-66-72.
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Honciuc, Andrei, and Oana-Iuliana Negru. "NanoTraPPED—A New Method for Determining the Surface Energy of Nanoparticles via Pickering Emulsion Polymerization." Nanomaterials 11, no. 12 (2021): 3200. http://dx.doi.org/10.3390/nano11123200.
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Surface energy with its polar and disperse components describes the physicochemical state of nanoparticles’ (NPs) surfaces, and can be a valuable parameter for predicting their bulk behavior in powders. Here, we introduce a new method, namely, Nanoparticles Trapped on Polymerized Pickering Emulsion Droplets (NanoTraPPED), for measuring the surface energy of a series of silica NPs bearing various surface functional groups. The method consists in creating Pickering emulsions from vinyl bearing monomers, immiscible with water, whereas NPs of interest have a stabilizing role, and in the process, become trapped at the monomer/water interface of emulsion droplets. The Pickering emulsion is polymerized, and polymer microspheres (colloidosomes) decorated with NPs are obtained. NanoTraPPED relies on measuring contact angles from the immersion depth of nanoparticles at the interface of various polymer colloidosomes with the electron microscope. The contact angle values are used as input for the Owens-Wendt-Rabel-Kaelble (OWRK) model, to quantitatively determine the total surface energy with water γNP/water, air γNP, and the corresponding polar and dispersive interaction components of NPs carrying -NH2, -SH, -OH, -CN and -C8 surface functional groups, ranking these according to their polarity. Our findings were confirmed independently by calculating the interfacial desorption energies of NPs from contact angles.