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Добірка наукової літератури з теми "Wettability of vegetal surfaces"

Автор: Grafiati

Опубліковано: 29 березня 2025

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Статті в журналах з теми "Wettability of vegetal surfaces"

Tita, SPS, R. Medeiros, JR Tarpani, E. Frollini, and V. Tita. "Chemical modification of sugarcane bagasse and sisal fibers using hydroxymethylated lignin: Influence on impact strength and water absorption of phenolic composites." Journal of Composite Materials 52, no. 20 (January 25, 2018): 2743–53. http://dx.doi.org/10.1177/0021998317753886.

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Chemical modification of fiber surfaces can increase wettability of composites reinforced by vegetal fibers and, consequently, the dispersion of the fiber in the matrix and mechanical properties can be improved. Although there are some studies about agents for chemical modifications of vegetal fiber surfaces, there are few data and discussion about the usage of lignin. In the present work, chemical modifications of sugarcane bagasse and sisal fibers using lignin (previously hydroxymethylated) were carried out under different reaction times (15, 30, and 60 min). The composition (holocellulose, hemicelluloses, cellulose, and lignin contents) of the treated and untreated fibers was evaluated. Phenolic composites were prepared using unmodified and modified fibers via compression molding process under temperature. Izod impact, water absorption tests, and scanning electron microscopy were performed to evaluate composite properties. The resin and lignin were characterized by size exclusion chromatography. Results showed that there was a tendency of reducing water absorption for composites prepared from modified fibers. Impact strengths of composites reinforced with sugarcane bagasse with modified fibers were similar to the ones with unmodified fibers (around 20 J/m). However, impact strengths for composites reinforced with modified sisal fibers (around 104 J/m for 15 min of reaction time) were higher than the ones with unmodified fibers (around 95 J/m). Therefore, the usage of lignin as a modifier agent of vegetal fiber surfaces to increase fiber–matrix adhesion for phenolic composites is a strategic alternative for improving products through simple, eco-friendly, and low-cost procedures.

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Osorio, Fernando, Gonzalo Valdés, Olivier Skurtys, Ricardo Andrade, Ricardo Villalobos-Carvajal, Andrea Silva-Weiss, Wladimir Silva-Vera, Begoña Giménez, Marcela Zamorano, and Johana Lopez. "Surface Free Energy Utilization to Evaluate Wettability of Hydrocolloid Suspension on Different Vegetable Epicarps." Coatings 8, no. 1 (December 30, 2017): 16. http://dx.doi.org/10.3390/coatings8010016.

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Surface free energy is an essential physicochemical property of a solid and it greatly influences the interactions between vegetable epicarps and coating suspensions. Wettability is the property of a solid surface to reduce the surface tension of a liquid in contact with it such that it spreads over the surface and wets it, resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by an energy balance between adhesive and cohesive work. The spreading coefficient (Scf/food) is the difference between the work of adhesion and the work of cohesion. Surface wettability is measured by the contact angle, which is formed when a droplet of a liquid is placed on a surface. The objective of this work was to determine the effect of hydroxypropyl methylcellulose (HPMC), κ-carrageenan, glycerol, and cellulose nanofiber (CNF) concentrations on the wettability of edible coatings on banana and eggplant epicarps. Coating suspension wettability on both epicarps were evaluated by contact angle measurements. For the (Scf/food) values obtained, it can be concluded that the surfaces were partially wet by the suspensions. Scf/food on banana surface was influenced mainly by κ-carrageenan concentration, HPMC-glycerol, κ-carrageenan-CNF, and glycerol-CNF interactions. Thus, increasing κ-carrageenan concentrations within the working range led to a 17.7% decrease in Scf/banana values. Furthermore, a HPMC concentration of 3 g/100 g produced a 10.4% increase of the Scf/banana values. Finally, Scf/fruit values for banana epicarps were higher (~10%) than those obtained for eggplant epicarp, indicating that suspensions wetted more the banana than the eggplant surface.

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Bartman, Marcin, Sebastian Balicki, Lucyna Hołysz, and Kazimiera A. Wilk. "Surface Properties of Graffiti Coatings on Sensitive Surfaces Concerning Their Removal with Formulations Based on the Amino-Acid-Type Surfactants." Molecules 28, no. 4 (February 20, 2023): 1986. http://dx.doi.org/10.3390/molecules28041986.

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Water-in-oil (w/o) nanoemulsions stabilized with amino acid surfactants (AAS) are one example of nanotechnology detergents of the “brush on, wipe off”-type for removing graffiti coatings from different sensitive surfaces. The high-pressure homogenization (HPH) process was used to obtain the nanostructured fluids (NSFs), including the non-toxic and eco-friendly components such as AAS, esterified vegetable oils, and ethyl lactate. The most effective NSF detergent was determined by response surface methodology (RSM) optimization. Afterwards, several surface properties, i.e., topography, wettability, surface free energy, and the work of water adhesion to surfaces before and after their coverage with the black graffiti paint, as well as after the removal of the paint layers by the eco-remover, were determined. It was found that the removal of graffiti with the use of the NSF detergent is more dependent on the energetic properties and microporous structure of the paint coatings than on the properties of the substrates on which the layers were deposited. The use of NSFs and knowledge of the surface properties could enable the development of versatile detergents that would remove unwanted contamination from various surfaces easily and in a controlled way.

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Conradi, Marjetka, Bojan Podgornik, Maja Remškar, Damjan Klobčar, and Aleksandra Kocijan. "Tribological Evaluation of Vegetable Oil/MoS2 Nanotube-Based Lubrication of Laser-Textured Stainless Steel." Materials 16, no. 17 (August 26, 2023): 5844. http://dx.doi.org/10.3390/ma16175844.

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In the present work, the functionalisation of austenitic stainless steel, AISI 316L surfaces via nanosecond Nd:YAG laser texturing in order to modify the surface morphology with crosshatch and dimple patterns is presented. A tribological analysis under lubrication with sunflower and jojoba oil with and without the addition of a solid lubricant, MoS2 nanotubes, was performed. In conjunction with friction/wear response laser-textured surface wettability, oil spreadability and oil retention capacity were also analysed. It was shown that the crosshatch pattern generally exhibited lower friction than the dimple pattern, with the addition of MoS2 nanotubes not having any significant effect on the coefficient of friction under the investigated contact conditions. This was found in addition to the better oil spreadability and oil retention capacity results of the crosshatch-textured surface. Furthermore, texturing reduced the wear of the stainless-steel surfaces but led to an approximately one order of magnitude larger wear rate of the steel counter-body, primarily due to the presence of hard bulges around the textured patterns. Overall, the crosshatch pattern showed better oil retention capacity and lower friction in combination with different vegetable oils, thus making it a promising choice for improving tribological performance in various environmentally friendly applications.

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Wang, Bingjie, Ziqiong Geng, Bo Pan, Lei Jiang, and Yong Lin. "Effect of Vegetable Oil Adjuvant on Wetting, Drift, and Deposition of Pesticide Droplets from UAV Sprayers on Litchi Leaves." Agronomy 15, no. 2 (January 24, 2025): 293. https://doi.org/10.3390/agronomy15020293.

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The spatial transportation of pesticide spray droplets and their deposition and retention on plant leaf surfaces are critical factors contributing to pesticide loss. Adding adjuvants to pesticide solutions to improve their wettability and deposition behavior can enhance the targeted deposition efficiency of pesticides sprayed by unmanned aerial vehicle (UAV) sprayers. In this study, Maifei(MF), a prevalent vegetable oil adjuvant, was selected to analyze its effects on the physicochemical properties of water and 10% difenoconazole water-dispersible granules (D) and the wetting performance of droplets on litchi leaves. The changes in the drift and deposition of the spray solutions with or without MF were tested using a UAV sprayer, DJI T40. The results indicated that the addition of MF to water or D significantly decreased the surface tension (by 58.33% and 23.10%, respectively), wetting time (by 97.81% and 90.95%, respectively), and contact angle (by 40.95% to 70.75% for the adaxial and abaxial surfaces of litchi leaves), achieving the best effects at a 1% MF addition. Moreover, during the drift test, the addition of 1% MF to the solutions significantly reduced the cumulative drift rate (CDR) (by 48.10%). Finally, owing to the weakened spray drift risk and improved wettability of the droplets on litchi leaves with a 1% MF addition, the droplet deposition and penetration in the litchi canopy significantly improved, demonstrating an increased droplet density of 38.17% for the middle layers of the litchi and 15.75% for the lower layers, corresponding to increased coverage by 59.49% and 12.78%, respectively. Hence, MF can improve the interfacial properties of the spray solution on litchi leaves, reduce the drift risk, and promote deposition, thereby facilitating the efficient transfer and deposition of pesticide droplets from UAV sprayers.

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Ashokkumar, Saranya, Jens Adler-Nissen, and Per Møller. "Factors affecting the wettability of different surface materials with vegetable oil at high temperatures and its relation to cleanability." Applied Surface Science 263 (December 2012): 86–94. http://dx.doi.org/10.1016/j.apsusc.2012.09.002.

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Baldin, Vitor, Leonardo Rosa Ribeiro da Silva, Rogério Valentim Gelamo, Andres Bustillo Iglesias, Rosemar Batista da Silva, Navneet Khanna, and Alisson Rocha Machado. "Influence of Graphene Nanosheets on Thermo-Physical and Tribological Properties of Sustainable Cutting Fluids for MQL Application in Machining Processes." Lubricants 10, no. 8 (August 21, 2022): 193. http://dx.doi.org/10.3390/lubricants10080193.

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The growing need to increase productivity and pressures for more sustainable manufacturing processes lead to a shift to less harmful lubrication systems that are less harmful to nature and the people involved. The minimal quantity lubrication system (MQL) stands out in this respect, especially in interrupted cutting processes such as milling, due to the cutting interface’s highly dynamic and chaotic nature. Using graphene sheets in cutting fluids also increases the efficiency of machining processes. This work investigates the influence on thermophysical and tribological properties of concentrations of 0.05 wt% and 0.1 wt% of graphene sheets in two vegetable-based and one mineral-based cutting fluids. The fluids are first characterized (viscosity, thermal conductivity, diffusivity, and wettability) and tested in reciprocating and ramp milling tests; all experiments are based on norms. The results show that the experiments with cutting fluids (with and without graphene) showed better tribological behavior than those in dry conditions. The graphene sheets alter the thermo-physical and tribological properties of the cutting fluids. The MQL15 vegetable-based fluid showed better lubricating properties in the milling tests, with better conditions for tribosystem chip–tool–workpiece interfaces, which makes the friction coefficient, and wear rate stable. Vegetable-based cutting fluids, even in minimum quantities and with graphene nanoparticles, have a high potential for increasing the efficiency and sustainability of the milling process.

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Ma, Cha, Yu Ping Yang, and Long Li. "Study on Drilling Fluid Technology of Eliminating Bit Balling by Changing Wettability." Advanced Materials Research 542-543 (June 2012): 1083–86. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.1083.

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Using triethanolamine, vegetable fatty acid, alkyl polyoxyethylene alkyl ether sulfuric acid ester and dimethyl sulfate as raw materials, a new kind of anti-balling additive for drilling engineering (WORB) was synthesized. The wetting property and anti-balling performance of WORB were investigated according to the experiments of wettability, surface tension and absorption effect. The results indicate that the adsorption of WORB on the surface of the cuttings is monolayer adsorption, which can avoid repeated cutting caused by the agglomeration of cuttings. WORB can alter the wettability of rock surface and the inner pores of the rock to reduce the surface tension of the rocks. Moreover, WORB can form multilayer chemical and physical adsorption on the surface of drill bits and BHA in the form of oriented adsorption of organic phosphine.

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Orkoula, Malvina G., Petros G. Koutsoukos, Michel Robin, Olga Vizika, and Louis Cuiec. "Wettability of CaCO3 surfaces." Colloids and Surfaces A: Physicochemical and Engineering Aspects 157, no. 1-3 (October 1999): 333–40. http://dx.doi.org/10.1016/s0927-7757(99)00047-3.

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Vargha-Butler, E. I., E. Kiss, C. N. C. Lam, Z. Keresztes, E. Kálmán, L. Zhang, and A. W. Neumann. "Wettability of biodegradable surfaces." Colloid & Polymer Science 279, no. 12 (December 1, 2001): 1160–68. http://dx.doi.org/10.1007/s003960100549.

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Дисертації з теми "Wettability of vegetal surfaces"

Bami, Chatenet Yann. "Modélisation analytique du mouillage sur des topographies multi-échelles complexes pour le design biomimétique de surfaces superhydrophobes." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0053.

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Une goutte d’eau roule sur une feuille de lotus sacré mais elle adhère à un pétale de rose. Ces deux surfaces présentent, aux échelles micrométrique et nanométrique, une morphologie complexe. Quel est alors le lien entre leur mouillabilité et leur morphologie multi-échelles ? L’objectif de cette thèse est de mener une approche biomimétique pour la conception de surfaces superhydrophobes tout en comprenant les stratégies mises en œuvre par le vivant. Dans une première partie, nous caractérisons des surfaces végétales dont le régime de mouillage est observé directement par microscopie confocale à balayage laser. Nous démontrons que le lotus sacré produit un mouillage en régime mixte métastable caractérisable par une profondeur d’ancrage non nulle des lignes triples à l’équilibre. De plus, nous observons un régime hiérarchique de Wenzel-Wenzel sur le pétale de rose, à rebours des hypothèses de la littérature. De ces observations, nous tirons des questionnements clés que nous confrontons aux modèles actuels de la littérature. Dans une seconde partie, nous adaptons deux approches des phénomènes capillaires à l’étude du piégeage d’air sur une topographie multi-échelles et introduisons la paramétrisation nécessaire à l’étude des régimes de mouillage mixte et de leur robustesse. Nous prédisons la profondeur d’ancrage à l’équilibre sur le lotus sacré en mettant en lumière le rôle de sa topographie nanométrique. Enfin, nous décrivons les mécanismes gouvernant les mouvements à l’avancée et à la reculée et leurs propagations par récurrence à travers les échelles topographiques constituant une surface en introduisant la notion de mouvement précurseur. Nous démontrons l’effet de la profondeur d’ancrage à l’équilibre sur l’hystérèse d’angle de contact et le rôle des sous-échelles topographiques sur la robustesse du régime de piégeage d’air. À travers l’étude expérimentale de surfaces fabriquées par photolithographie, nous confrontons ce modèle à la réalité. Enfin, dans une troisième partie, nous transposons les conclusions issues de ce modèle en un cahier des charges pour la conception de surfaces superhydrophobes robustes, déclinons la stratégie mise en œuvre par la feuille du lotus sacré et proposons deux voies de fabrication de surfaces déperlantes, par recristallisation de cire naturelle et polymérisation deux-photons
A drop of water rolls on the sacred lotus leaf but stay fiercely anchored onto a rose petal. Both surfaces display a complex morphology at the micrometric and nanometric scales. Therefore, one could ask: how are their wettability and their morphology related? The purpose of this dissertation is to carry out a biomimetic approach in order to conceive superhydrophobic surfaces and to better understand nature’s strategies. In a first part, vegetal surfaces have been characterized by directly observing the wetting state they produce with the help of confocal microscopy. We demonstrate the fact that the sacred lotus produces a metastable mixed-state wetting that is characterized by a finite equilibrium anchorage depth of triple lines. On the other hand, a Wenzel-Wenzel hierarchical wetting state is observed on the rose petal, in spite of what literature suggests. From these experiments, key questions have been highlighted and confronted to the current models available within the literature. In a second part, two approaches to capillary phenomena have been adapted to the study of a composite wetting state produced by a multiscale topography. We introduce a complete parameterization allowing us to tackle the problem of the mixed-state wetting and its stability, to predict the value of the equilibrium anchorage depth on the sacred lotus leaf and to identify the contribution of its nanoscale topography to its wetting. Then, we thoroughly describe the mechanisms underlying the advancing and receding motions of triple lines and their recursive propagation across every topographical scale constituting a surface by introducing the notion of precursor motion. We highlight the effect of the equilibrium anchorage depth on the contact angle hysteresis and the role played by topographical subscales on the robustness of the composite wetting state. Through the experimental study of model surfaces manufactured by photolithography, we compare our predictions to reality. Eventually, in a third part, the conclusions drawn from our model are transposed into technical specifications for the conception of robust superhydrophobic surfaces, the strategy of the sacred lotus leaf is thoroughly described and two promising manufacturing processes are proposed through the recrystallization of natural wax and two-photon polymerization

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Melberg, Brita. "Nanostructured surfaces with patterned wettability." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19410.

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This project aims at the fabrication of a rough polydimethylsiloxane(PDMS) surface with patterned smooth areas. The idea is that such a surface will allow for water capturing on the smooth areas of the surface. The applications for this kind of surface are many, but especially the prospects of a surface able to trap droplets of cells in suspension by simply dipping the surface into the suspension is intriguing.From a previous project[1], and another student’s master’s thesis[2], the use of an etched copper surface seemed promising for the fabrication of a rough mold. This was abandoned after sandpaper turned out to be an even better mold, giving superhydrophobic PDMS(162, 33 ± 1, 40degrees).The negative photoresist SU-8 5 was used to pattern the sandpaper with small, circular features on the P1000 sandpaper(400μm and 1mm in diameter). The PDMS replica from this mold was a rough surface with smooth wells. This was not able to capture water droplets effectively, partly because air bubbles were trapped in the wells during the immersion in water. To avoid this, another mold was procured by the silanization of the previously made PDMS surface. The PDMS replica of the silanized PDMS had smooth pillars instead of wells, and did not succeed in trapping water droplets either. In fact, the smooth wells seemed to better at capturing the water.This project has succeeded in producing high enough roughness on PDMS to alter the contact angle with water by ∼ 61 degrees to a contact angle exceeding the lower limit for superhydrophobic surfaces by ∼ 12 degrees. The use of a sandpaper mold has proven to is simple, inexpensive and effective at producing PDMS with high contact angles.

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Hobæk, Thor Christian. "Nanostructured PDMS surfaces with patterned wettability." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-21045.

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In this study, a surface with patterned wettability by means of surface structuring, rather than through modifying the surface chemistry, was developed. The device presented in this thesis was inspired by the Namib Desert Bettle, which collects water from the fog by having hydrophilic spots surrounded by hydrophobic wax-coated regions on its back. Besides water collection, controlling the wetting behaviour locally on the surface may find applications within droplet-based microfluidics, or fabrication of DNA, protein or cell microarrays. Spatial wetting contrast was achieved through replica moulding of the elastomer polydimethylsiloxane (PDMS), using a copper and/or the epoxy-based SU-8 photoresist surface as a template. Different types of surface roughness was produced and characterized on polycrystalline copper, through etching, oxidation, electrodeposition, or a combination. Regions with no surface roughness was patterned on the template moulds through conventional UV-photolithography processing of SU-8. The PDMS replicas were then tested for the ability to capture water droplets selectively on the patterned spots. Through characterization of the surface roughness by atomic force microscopy (AFM) and scanning electron microscopy (SEM), copper plates etched with a solution of CuCl2 and HCl produced the highest amount of surface roughness, with longer etching times leading to increased surface roughness. To characterize the hydrophobicity, the contact angle was measured for droplets deposited on the rough PDMS surfaces. Through surface structuring, the contact angle was increased from 101.8 ± 3.6◦ for a flat surface, to 154.7 ± 5.3◦ for the PDMS surface with the highest roughness. The polarity of surface roughness was also found to play an important role in the wetting behaviour, with a higher number of peaks than valleys being preferable. The fabricated PDMS surfaces showed spatial wetting contrast, as demonstrated in the cover photo. The device needs further optimization in terms of increasing the hydrophobicity of the rough regions, as well as changing the pattern geometries. However, the discoveries made in this study may be useful for further development and integration with droplet-moving mechanisms, for future lab-on-a-chip applications within medical diagnostics or chemical analysis.

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Badge, Ila. "Tuning Wettability And Adhesion Of Structured Surfaces." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1393716842.

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Zhang, Xueyun. "Wettability tuning by surface modification /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CBME%202009%20ZHANG.

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Falah, Toosi Salma. "Superhydrophobic polymeric surfaces : fabrication, wettability, and antibbacterial activity." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62353.

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This PhD thesis studies fabrication of superhydrophobic polymeric surfaces, their wetting properties, and their antibacterial activities as potential application to medical sciences. A femtosecond laser technique was used to fabricate mico/nano- structures on the surface of PTFE and PU. The effect of laser parameters (fluence, scanning speed, and overlap) on the wettability of the resulted micro/nano-patterns was studied. Two techniques were used to laser-scan the surface, namely uniaxial and biaxial scan. Uniaxial scan creates channeled morphology with direction-dependent wettability. To produce uniform wettability independent of direction, biaxial scanning was examined, which creates well-defined pillars with very high contact angle (CA) and very low contact angle hysteresis (CAH). To facilitate and speed up the surface micro/nano-structuring, laser-ablation was coupled with thermal imprinting. The metallic femtosecond laser-ablated templates were employed to imprint micron/submicron periodic structures onto the surface of several polymers. The CA of imprinted polymers increased to above 160°, while their CAH varied significantly depending on the surface thermophysical and chemical properties. A unique technique was developed to create superomniphobic patterns on HDPE through hot embossing. The filefish skin dual scale superoleophobic patterns were used as a biological model to develop angled microfiber arrays on HDPE. The obtained bioinspired surface is highly capable of repelling both water and liquids with low surface tensions that meets the superomniphobic criteria. The effect of superhydrophobicity on protein adsorption and bacterial adhesion of laser-ablated PTFE substrates were investigated. Samples were incubated in Gram negative (E.coli) and Gram positive (S.aureus) bacteria cultures, BSA solution, IgG solution, and blood plasma for 4 hours. All superhydrophobic surfaces were found to be more resistant to protein /bacteria adhesion compared to the corresponding smooth samples. However, some of the most superhydrophobic PTFE surfaces were found to exhibit the highest adherence with protein/bacteria; while some other did not allow any adsorption/adherence of protein/bacteria respectively towards the end of the incubation. Besides the CA, CAH, average height of pillars, and spacing distance between iii the pillars, this study showed that there are other roughness factors, which play crucial role in the durability of the superhydrophobic surfaces such as the distribution of pillar heights.
Applied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate

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Plaisance, Marc Charles. "Cellular Response to Surface Wettability Gradient on Microtextured Surfaces." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/53730.

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Objective: Topography, chemistry, and energy of titanium (Ti) implants alter cell response through variations in protein adsorption, integrin expression, and downstream cell signaling. However, the contribution of surface energy on cell response is difficult to isolate because altered hydrophilicity can result from changes in surface chemistry or microstructure. Our aim was to examine a unique system of wettability gradients created on microstructured Ti on osteoblast maturation and phenotype. Method: A surface energy gradient was created on sand-blasted/acid-etched (SLA) Ti surfaces. Surfaces were treated with oxygen plasma for 2 minutes, and then allowed to age for 1, 12, 80, or 116 hours to generate a wettability gradient. Surfaces were characterized by contact angle and SEM. MG63 cells were cultured on SLA or experimental SLA surfaces to confluence on TCPS. Osteoblast differentiation (IBSP, RUNX2, ALP, OCN, OPG) and integrin subunits (ITG2, ITGA5, ITGAV, ITGB1) measured by real-time PCR (n=6 surfaces per variable analyzed by ANOVA/Bonferroni’s modified Student’s t-test). Result: After plasma treatment, SLA surface topography was retained. A gradient of wettability was obtained, with contact angles of 32.0° (SLA116), 23.3° (SLA80), 12.5° (SLA12), 7.9° (SLA1). All surfaces were significantly more hydrophilic than the original SLA surface (126.8°). Integrin expression was affected by wettability. ITGA2 was higher on wettable surfaces than on SLA, but was highest on SLA1. ITGAV and ITGB1 were decreased on hydrophilic surfaces, but ITGA5 was not affected. IBSP, RUNX2, and ALP increased and OPG decreased with increasing wettability. OCN decreased with increasing wettability, but levels on the most wettable surface were similar to SLA. Conclusion: Here we elucidated the role of surface energy on cell response using surfaces with the same topography and chemistry. The results show that osteoblastic maturation was regulated in a wettability-dependent manner and suggest that the effects are mediated by integrins.

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Shirafkan, Abbas. "Wettability and hydrophilicity of rigid and soft contact lens surfaces." Thesis, City University London, 1997. http://openaccess.city.ac.uk/8385/.

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In the last two decades an abundance of contact lens materials with unknown surface properties have been introduced as well as new contact lens design. Recent studies have identified the importance of physical and chemical interactions between materials and liquids. The purpose of this experimental research work was to investigate the relationship between a contact lens surface and a liquid. The wettability and hydrophilicity of both soft and rigid contact lens surfaces were determined using two novel techniques and an established method. The two novel techniques were the un-separated adherent quid/laser method and the adherent liquid/ maximum force method whereas the established technique involved monitoring the receding wetting angle and interface are a diameter of a sessile drop. Contact lens surface preparation and the method of removing a liquid from hydrated surfaces were found to be important variables when determining wettability or hydrophilicity. Experiments showed that the use of surface tension to remove liquid from hydrated surfaces significantly improved the reproducibility of subsequent measurements. Variation of the sessile drop wetting angle and interface area diameter with evaporation time demonstrated different values for different contact lenses. The clinical consequence of monitoring the receding values would be; if a material to spread tear break up time occurs the dry patches will be advanced on PMMA, rather than Paraperm contact lens. Surface hydrophilicity, if defined in terms of the maximum adherent force, describes the ability of a lens surface to attract a liquid, whereas wettability may be defined as the ability of a liquid to spread on a contact lens surface. The wettability and hydrophilicity, therefore, are two different issues. When a wetting angle is 01, or close to 0" the surface is described as wettable. Results demonstrated that Equalens had a greater surface wettability and hydrophilicity than the PMMA for pre-wear, but the post-wear hydrophilicity for PMMA was greater than Equalens. The use of each measurement method, therefore, resulted in a value that is intrinsically related to measurement method and definition. The clinical consequenceo f the valuesi s to help practitioners prescribea lens material either on wettability or hydrophilicity values. In contact lens practice, a lens surface is required to maintain a stable tear film and produce a long tear film break up time. A combination of hydrophilicty and wetting angle values can help to determine the requirement of wettability and hydrophilicity in the contact lens industry and also in practice. It can be concluded that no single test can fully describe the surface properties of contact lens surface materials, but it is proposed that information and results from a series of tests provides the most useful clinical description.

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Sernek, Milan. "Comparative Analysis of Inactivated Wood Surfaces." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27429.

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A wood surface, which is exposed to a high temperature condition, can experience inactivation. Surface inactivation results in reduced ability of an adhesive to properly wet, flow, penetrate, and cure. Thus, an inactivated wood surface does not bond well with adhesives. The changes in surface chemistry, wettability, and adhesion of inactivated wood surfaces, including heartwood of yellow-poplar (Liriodendron tulipifera) and southern pine (Pinus taeda), were studied. Wood samples were dried from the green moisture content condition in a convection oven at five different temperature levels ranging from 50 to 200 Â°C. The comparative characterization of the surface was done by X-ray photoelectron spectroscopy (XPS), sessile drop wettability, and fracture testing of adhesive bonds. The oxygen to carbon ratio (O/C) decreased and the C1/C2 ratio increased with drying temperature. The C1 component is related to carbon-carbon or carbon-hydrogen bonds, and the C2 component represents single carbon-oxygen bond. A low O/C ratio and a high C1/C2 ratio reflected a high concentration of non-polar wood components (extractives/VOCs) on the wood surface, which modified the wood surface from hydrophilic to more hydrophobic. Wettability was directly related to the O/C ratio and inversely related to the C1/C2 ratio. Contact angle decreased with time and increased with the temperature of exposure. Southern pine had a lower wettability than yellow-poplar, which was due to a greater concentration of non-polar hydrocarbon-type extractives and heat-generated volatiles on the surface. Solvent extraction prior to drying did not improved wettability, whereas, extraction after drying improved wettability. A contribution of extractives migration and VOCs generation played a significant role in the heat-induced inactivation process of southern pine. The maximum strain energy release rate (Gmax) showed that surface inactivation was insignificant for yellow-poplar when exposed to drying temperatures < 187Â°C. The southern pine was most susceptible to inactivation at drying temperatures > 156Â°C, particularly when bonded with phenol-formaldehyde (PF) adhesive. Chemical treatments improved the wettability of inactivated wood surfaces, but an improvement in adhesion was not evident for specimens bonded with polyvinyl-acetate (PVA) adhesive. NaOH surface treatment was most effective for improving adhesion of the PF adhesive bond.
Ph. D.

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Tow, Emily Winona. "Bubble behavior in subcooled flow boiling on surfaces of variable wettability." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75682.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 59).
Flow boiling is important in energy conversion and thermal management due to its potential for very high heat fluxes. By improving understanding of the conditions leading to bubble departure, surfaces can be designed that increase heat transfer coefficients in flow boiling. Bubbles were visualized during subcooled nucleate flow boiling of water on a surface of variable wettability. Images obtained from the videos were analyzed to find parameters influencing bubble size at departure. A model was developed relating the dimensions of the bubble at departure to its upstream and downstream contact angles based on a rigid-body force balance between momentum and surface tension and assuming a skewed truncated spherical bubble shape. Both experimental and theoretical results predict that bubble width and height decrease with increasing flow speed and that the width increases with the equilibrium contact angle. The model also predicts that the width and height increase with the amount of contact angle hysteresis and that the height increases with equilibrium contact angle, though neither of these trends were clearly demonstrated by the data. Several directions for future research are proposed, including modifications to the model to account for deviations of the bubbles from the assumed geometry and research into the parameters controlling contact angle hysteresis of bubbles in a flow. Additionally, observations support that surfaces with periodically-varying contact angle may prevent film formation and increase the heat transfer coefficients in both film and pool boiling.
by Emily W. Tow.
S.B.

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Книги з теми "Wettability of vegetal surfaces"

1937-, Berg John C., ed. Wettability. New York: M. Dekker, 1993.

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International Symposium on Contact Angle, Wettability and Adhesion (3rd 2002 Providence, R.I.). Contact angle, wettability and adhesion. Edited by Mittal K. L. 1945-. Utrecht: VSP, 2003.

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R, Jones William, Herrera-Fierro Pilar, and United States. National Aeronautics and Space Administration., eds. Spontaneous dewetting of a perfluoropolyether. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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1940-, Jones William R., Herrera-Fierro Pilar, and United States. National Aeronautics and Space Administration., eds. Spontaneous dewetting of a perfluoropolyether. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Klintström, Stefan Welin. Ellipsometry and wettability gradient surfaces. Linköping University, 1992.

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Gas Wettability of Reservoir Rock Surfaces with Porous Media. Elsevier, 2018. http://dx.doi.org/10.1016/c2017-0-02303-0.

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Chen, Yuan, Zheng Yongmei, Cheng Qunfeng, and Hou Yongping. Bio-Inspired Wettability Surfaces: Developments in Micro- and Nanostructures. Jenny Stanford Publishing, 2015.

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Jiang, Guancheng. Gas Wettability of Reservoir Rock Surfaces with Porous Media. Elsevier Science & Technology Books, 2018.

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Bio-Inspired Wettability Surfaces: Developments in Micro- and Nanostructures. Taylor & Francis Group, 2015.

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Gas Wettability of Reservoir Rock Surfaces with Porous Media. Elsevier Science & Technology, 2018.

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Частини книг з теми "Wettability of vegetal surfaces"

Perz, Susan V., Christopher S. McMillan, and Michael J. Owen. "Wettability of Fluorosilicone Surfaces." In Fluorinated Surfaces, Coatings, and Films, 112–28. Washington, DC: American Chemical Society, 2001. http://dx.doi.org/10.1021/bk-2001-0787.ch009.

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Katz, Joseph L., Jin Sheng Sheu, and Jer Ru Maa. "Nucleation on Smooth Surfaces." In Modern Approaches to Wettability, 423–34. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-1176-6_16.

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Busscher, H. J. "Wettability of Surfaces in the Oral Cavity." In Modern Approaches to Wettability, 249–61. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-1176-6_9.

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Christenson, H. K. "The Long-Range Attraction between Macroscopic Hydrophobic Surfaces." In Modern Approaches to Wettability, 29–51. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-1176-6_2.

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Schrader, Malcolm E. "High- and Medium-Energy Surfaces: Ultrahigh Vacuum Approach." In Modern Approaches to Wettability, 53–71. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-1176-6_3.

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Joud, Jean-Charles, and Marie-Geneviève Barthés-Labrousse. "Experimental Determination through Wettability Measurements." In Physical Chemistry and Acid-Base Properties of Surfaces, 45–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119145387.ch5.

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Ozbay, Ridvan, Ali Kibar, and Chang-Hwan Choi. "Bubble Adhesion to Superhydrophilic Surfaces." In Advances in Contact Angle, Wettability and Adhesion, 149–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119117018.ch6.

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Papadopoulou, Evie L. "Pulsed Laser Deposition of Surfaces with Tunable Wettability." In Self-Cleaning Materials and Surfaces, 253–76. Chichester, UK: John Wiley & Sons Ltd, 2013. http://dx.doi.org/10.1002/9781118652336.ch9.

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Joud, Jean-Charles, and Marie-Geneviève Barthés-Labrousse. "Wettability of an Ideal Surface: Overview." In Physical Chemistry and Acid-Base Properties of Surfaces, 1–8. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119145387.ch1.

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Lee, Junghoon, Junghoon Lee, and Chang-Hwan Choi. "Superhydrophobic Surfaces for Anti-Corrosion of Aluminum." In Advances in Contact Angle, Wettability and Adhesion, 267–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119459996.ch12.

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Тези доповідей конференцій з теми "Wettability of vegetal surfaces"

Orlova, E. G., D. S. Nikitin, and S. A. Myazina. "Wettability of nanocomposite ceramic surfaces." In INTERNATIONAL YOUTH SCIENTIFIC CONFERENCE “HEAT AND MASS TRANSFER IN THE THERMAL CONTROL SYSTEM OF TECHNICAL AND TECHNOLOGICAL ENERGY EQUIPMENT” (HMTTSC 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5120680.

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Kita, Yutaku, Coinneach MacKenzie-Dover, Alexandros Askounis, Yasuyuki Takata, and Khellil Sefiane. "DROP MOBILITY ON SUPERHYDROPHOBIC SURFACES WITH WETTABILITY CONTRASTS." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.cod.023512.

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Parin, Riccardo, Stefano Bortolin, Alessandro Martucci, and Davide Del Col. "EXPERIMENTS OF DROPWISE CONDENSATION ON WETTABILITY CONTROLLED SURFACES." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.cod.024208.

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Song, Hyunsoo, Yongku Lee, Songwan Jin, Ho-Young Kim, and Jung Yul Yoo. "Sessile Drop Evaporation on Surfaces of Various Wettability." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52096.

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This work experimentally investigates the evaporation rates of water drops on surfaces of various wettability. By measuring the temporal evolutions of the drop radius and contact angle, we find the qualitative difference between the evaporation behavior on hydrophilic surfaces where the contact radius remains constant initially and that on the superhydrophobic surfaces where the contact angle remains constant. Also, the evaporation rate is observed to depend on the surface material although the currently available models assume that the rate is solely determined by the drop geometry. Although the theory to explain this dependence on the surface remains to be pursued by the future work, we give the empirical relations that can be used to predict the drop volume evolution for each surface.

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Han, Z. J., M. Shakerzadeh, B. K. Tay, and C. M. Tan. "Protein immobilization on nanostructured surfaces with different wettability." In 2010 IEEE 3rd International Nanoelectronics Conference (INEC). IEEE, 2010. http://dx.doi.org/10.1109/inec.2010.5424833.

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Bonner, Richard W. "Dropwise Condensation on Surfaces With Graded Hydrophobicity." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88516.

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Dropwise condensation has shown the ability to increase condensation heat transfer coefficients by an order of magnitude over filmwise condensation. In standard dropwise condensation, liquid droplets forming on a sub-cooled nonwetting surface are removed from the surface by gravitational forces when the droplets reach a critical mass. The dependence on gravity for liquid removal limits the utilization of dropwise condensation in low gravity aerospace applications and horizontal surfaces. Presented in this study is a novel passive mechanism to remove droplets from a condensing surface using a surface energy gradient (wettability gradient) on the condensing surface. The wettability gradient creates a difference in contact angle across droplets condensing on the surface. The difference in contact angle across the droplets causes motion of the droplets to regions of increased wettability, without relying on additional forces. The movement of droplets away from the surface prevents flooding and allows for the condensation of new droplets on the surface. This paper presents an overall description of the wettability gradient mechanism and experimental condensation data acquired on surfaces with wettability gradients. A mechanism for creating the wettability gradients is also described, which involves varying the surface concentration of hydrophobic molecules through a self-assembled monolayer process.

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Zheng, Yongmei. "Bioinspired Wettability-Controlled Surfaces with Gradient Micro- and Nanostructures." In The 3rd World Congress on New Technologies. Avestia Publishing, 2017. http://dx.doi.org/10.11159/icnfa17.114.

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Sun, Emily Wei-Hsin, and Ian C. Bourg. "Wettability of Mineral Surfaces by Water and Carbon Dioxide." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2492.

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Anand, A. Vivek, S. Gollakota, V. Hariprasad, N. Shunmugavelu, Ashifkhan, and V. Arumugam. "Wettability characteristics of microgroove patterned SS304 stainless steel surfaces." In INTERNATIONAL CONFERENCE ON MATERIALS, MANUFACTURING AND MACHINING 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5117963.

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Coletti, C., M. J. Jaroszeski, A. Pallaoro, A. M. Hoff, S. Iannotta, and S. E. Saddow. "Biocompatibility and wettability of crystalline SiC and Si surfaces." In 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2007. http://dx.doi.org/10.1109/iembs.2007.4353678.

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Звіти організацій з теми "Wettability of vegetal surfaces"

Степанюк, Олександр Миколайович, and Руслана Михайлівна Балабай. Controlling by Defects of Switching of ZnO Nanowire Array Surfaces from Hydrophobic to Hydrophilic. Вид-во Прикарпатського нац. ун-т ім. Василя Стефаника, October 2023. http://dx.doi.org/10.31812/123456789/8487.

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The study investigated the wettability of polar and nonpolar ZnO nanowire surfaces, the effect of defects on the transition from hydrophobic to hydrophilic state of the surface of a ZnO nanowire array, and the atomic-level mechanisms of reversible wettability using first-principles density functional theory and pseudopotential methods.

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Abbott, Nicholas L., John P. Folkers, and George M. Whitesides. Manipulation of the Wettability of Surfaces on the 0.1 to 1 Micrometer Scale Through Micromachining and Molecular Self-Assembly. Fort Belvoir, VA: Defense Technical Information Center, July 1992. http://dx.doi.org/10.21236/ada254887.

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Barker, Amanda, Thomas Douglas, Erik Alberts, P. U. Ashvin Iresh Fernando, Garrett George, Jon Maakestad, Lee Moores, and Stephanie Saari. Influence of chemical coatings on solar panel performance and snow accumulation. Engineer Research and Development Center (U.S.), January 2024. http://dx.doi.org/10.21079/11681/48059.

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Solar panel performance can be impacted when panel surfaces are coated with substances like dust, dirt, snow, or ice that scatter and/or absorb light and may reduce efficiency. As a consequence, time and resources are required to clean solar panels during and after extreme weather events or whenever surface coating occurs. Treating solar panels with chemical coatings that shed materials may decrease the operating costs associated with solar panel maintenance and cleaning. This study investigates three commercial coatings for use as self-cleaning glass technologies. Optical and thermal properties (reflectivity, absorption, and transmission) are investigated for each coating as well as their surface wettability and particle size. Incoming solar radiation was continuously monitored and snow events were logged to estimate power production capabilities and surface accumulation for each panel. In terms of power output, the commercial coatings made little impact on overall power production compared to the control (uncoated) panels. This was attributable to the overall high transmission, low absorption, and low reflection of each of the commercial coatings, making their presence on the surface of solar panels have minimal impact besides to potentially shed snow While the coatings made no observable difference to increase power production compared to the control panels, the shedding results from video monitoring suggest both the hydrophilic or hydrophobic test coatings decreased snow accumulation to a greater extent than the control panels (uncoated). Controlling the wettability properties of the solar panel surfaces has the potential to limit snow accumulation when compared to uncoated panel surfaces.

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