Готові списки джерел за темами / Dewetting processes

Добірка наукової літератури з теми "Dewetting processes"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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Статті в журналах з теми "Dewetting processes"

Callegari, G., A. Calvo, and J. P. Hulin. "Dewetting processes in a cylindrical geometry." European Physical Journal E 16, no. 3 (February 7, 2005): 283–90. http://dx.doi.org/10.1140/epje/i2004-10082-4.

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Edwards, Andrew M. J., Rodrigo Ledesma-Aguilar, Michael I. Newton, Carl V. Brown, and Glen McHale. "Not spreading in reverse: The dewetting of a liquid film into a single drop." Science Advances 2, no. 9 (September 2016): e1600183. http://dx.doi.org/10.1126/sciadv.1600183.

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Wetting and dewetting are both fundamental modes of motion of liquids on solid surfaces. They are critically important for processes in biology, chemistry, and engineering, such as drying, coating, and lubrication. However, recent progress in wetting, which has led to new fields such as superhydrophobicity and liquid marbles, has not been matched by dewetting. A significant problem has been the inability to study the model system of a uniform film dewetting from a nonwetting surface to a single macroscopic droplet—a barrier that does not exist for the reverse wetting process of a droplet spreading into a film. We report the dewetting of a dielectrophoresis-induced film into a single equilibrium droplet. The emergent picture of the full dewetting dynamics is of an initial regime, where a liquid rim recedes at constant speed and constant dynamic contact angle, followed by a relatively short exponential relaxation of a spherical cap shape. This sharply contrasts with the reverse wetting process, where a spreading droplet follows a smooth sequence of spherical cap shapes. Complementary numerical simulations and a hydrodynamic model reveal a local dewetting mechanism driven by the equilibrium contact angle, where contact line slip dominates the dewetting dynamics. Our conclusions can be used to understand a wide variety of processes involving liquid dewetting, such as drop rebound, condensation, and evaporation. In overcoming the barrier to studying single film-to-droplet dewetting, our results provide new approaches to fluid manipulation and uses of dewetting, such as inducing films of prescribed initial shapes and slip-controlled liquid retraction.

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Scandurra, Antonino, Maria Censabella, Stefano Boscarino, Guglielmo Guido Condorelli, Maria Grazia Grimaldi, and Francesco Ruffino. "Fabrication of Cu(II) oxide-hydroxide nanostructures onto graphene paper by laser and thermal processes for sensitive nano-electrochemical sensing of glucose." Nanotechnology 33, no. 4 (November 2, 2021): 045501. http://dx.doi.org/10.1088/1361-6528/ac2d0b.

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Abstract Glucose electrochemical sensors based on nanostructures of CuO/Cu(OH)2 onto graphene paper were prepared by thermal (solid) and nanosecond pulsed laser (molten phase) dewetting of a CuO layer 6 nm thin deposited by sputtering. Dewetted systems, obtained without the use of any binder, act as array of nanoelectrodes. Solid state and molten phase dewetting produce nanostructures of copper oxide-hydroxide with different average size, shape and surface composition. Molten phase dewetting originates particles with size below 100 nm, while solid state dewetting produces particles with average size of about 200 nm. Moreover, molten phase dewetting produce drop-shaped nanostructures, conversely nanostructures derived from solid state dewetting are multifaceted. X-ray photoelectron spectroscopy (XPS) characterization revealed that the surface of nanostructures is formed by a copper(II) species CuO and Cu(OH)2. Shape of anodic branch of the cyclic voltammograms of glucose in alkali solution evidenced a convergent diffusion mechanism. Analytical performances in amperometric mode are as good as or better than other sensors based on copper oxide. Amperometric detection of glucose was done at potential as low as 0.4 V versus saturated calomel electrode by both types of electrodes. Linear range from 50 μM to 10 mM, sensitivity ranging from 7 to 43 μA cm−2 mM−1 and detection limit of 7 μM was obtained. Good analytical performances were obtained by laser dewetted electrodes with a low copper content up to 1.2 by atoms percentage of the surface. Analytical performance of the proposed electrodes is compliant for the determination of glucose both in blood serum, saliva or tear.

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Reiter, Guenter. "Unstable thin polymer films: rupture and dewetting processes." Langmuir 9, no. 5 (May 1993): 1344–51. http://dx.doi.org/10.1021/la00029a031.

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Rezende, C. A., L. T. Lee, and F. Galembeck. "Atomic Force Microscopy Applied to the Study of Dewetting Patterns of Thin Films from Polymer Solutions." Microscopy and Microanalysis 11, S03 (December 2005): 110–13. http://dx.doi.org/10.1017/s1431927605051019.

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Stable and defect-free films are required for many technological applications, while controlled dewetting processes are important for producing thin film microstructuring for microelectronics, optical devices and biochip technology. In this work, we study the dewetting features formed by drying an aqueous solution of a charged polymer deposited on a mica substrate. A rich variety of morphologies can be formed, including holes, polygonal networks, droplets and elongated structures. The dewetting behavior depends on film thickness and on the charge density on the polymer that can be controlled by surfactant addition. The various nanoscale morphological patterns that are formed may be applied as a potential method for surface nanostructuring.

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Oliveira, Bruno M. C., Ruben F. Santos, and Manuel F. Vieira. "In Situ Annealing Behavior of Cu Thin Films Deposited over Co-W Diffusion Barrier Layers." Applied Sciences 12, no. 19 (September 28, 2022): 9778. http://dx.doi.org/10.3390/app12199778.

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The development of new materials for the electronics industry has been in focus in recent years, as circuit miniaturization poses challenges for conventional solutions. Dewetting of Cu films over diffusion-barrier layers has fostered an interest in developing new solutions with lower interfacial energies, to withstand processing and service life. Co-W is a candidate material for seedless Cu-interconnect deposition, but its behavior during annealing is still not properly addressed. This study used an in situ scanning-electron-microscopy (SEM) approach to assess how heating rates affect dewetting behavior, as well as to determine the limits of annealing of 40 nm-thick Cu films deposited over this substrate. The 10 °C/min heating rate used showed copper dewetting starting at 450 °C, whereas the higher 30 °C/min rate induced dewetting at 400 °C. The Cu film deposited over Ta exhibited slightly different dewetting, with its onset starting earlier, but developing a slower progression throughout the temperature range analyzed in the annealing treatments.

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Singh, Satya Pal. "Spinodal Theory: A Common Rupturing Mechanism in Spinodal Dewetting and Surface Directed Phase Separation (Some Technological Aspects: Spatial Correlations and the Significance of Dipole-Quadrupole Interaction in Spinodal Dewetting)." Advances in Condensed Matter Physics 2011 (2011): 1–14. http://dx.doi.org/10.1155/2011/526397.

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The emerging structures in spinodal dewetting of thin nano films and spinodal decomposition of binary mixtures are found to be similar with certain differences attributed to the nonlinearities inherent in the wetting forces. This paper deals with the technological aspects of the spinodal processes by giving a brief account of the theory and to correlate the two phenomena termed as spinodal dewetting of thin nanofilms and surface-directed phase separation. The MC simulation micrographs at early stage of spinodal dewetting of a (linear) polymer film confined between two hard walls (using FENE potential between the beads on same chain and Morse potential between inter and intra chain beads) show similarities with surface-directed phase separation (using metropolis algorithm) in creation of holes. The spinodal dewetting is also criticized on the basis of global minimization of free energy emerging from dipole-quadrupole interactions. A novel molecular scale-driving mechanism coming from asymmetric interface formation in spinodal processes is also proposed. It can be believed that the modeling done with the films under confinement of two walls works as a classical mathematical ansatz to the dipole-quadrupole interaction coming from quantum origins and giving rise to lateral interactions in the process reflecting a colossal behavior in thin nano films though weak in nature.

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Karapanagiotis, Ioannis, D. Fennell Evans, and William W. Gerberich. "Nucleation Processes for Dewetting Initiation of Thin Polymer Films." Langmuir 17, no. 11 (May 2001): 3266–72. http://dx.doi.org/10.1021/la0012337.

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Wu, Yihong, Peiwen Qiao, Towchong Chong, Teck-Seng Low, Hong Xie, Ping Luo, Zaibing Guo, and Jinjun Qiu. "Dewetting of resist/metal bilayers in resist stripping processes." Applied Physics Letters 78, no. 21 (May 21, 2001): 3361–63. http://dx.doi.org/10.1063/1.1374234.

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KINEFUCHI, Ikuya, Kenkichi MURATA, Yuta YOSHIMOTO, and Shu TAKAGI. "Measurement of dewetting processes using environmental scanning electron microscopy." Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP 2019 (2019): wakate_2. http://dx.doi.org/10.1299/jsmeiip.2019.wakate_2.

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Більше джерел

Дисертації з теми "Dewetting processes"

Sprittles, James Edward. "Dynamic wetting/dewetting processes in complex liquid-solid systems." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1095/.

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In this thesis, the phenomenon of a microdrop impacting onto and spreading over surfaces of constant and variable wettability is investigated. The study is motivated by wide-ranging industrial applications of ink-jet printing technologies, in particular used by our industrial sponsor Kodak Ltd. Mathematical models for dynamic wetting phenomena are incorporated into a specially developed finite element based numerical platform. By examining different models, it was found for the first time that the interface formation model is capable of describing the experimentally observed non-uniqueness of the relationship between the contact-line speed and the dynamic contact angle. It is shown that, the interface formation model naturally captures the effect which variations in the wettability of the solid surface have on an adjacent flow, so that the model can be used, without any ad-hoc alterations, to consider the spreading of microdrops on such solids. An investigation of the effect that variation of the model's parameters has on the characteristics of the impact and spreading of microdrops has been carried out.

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Частини книг з теми "Dewetting processes"

Duffar, Thierry, and Lamine Sylla. "Vertical Bridgman Technique and Dewetting." In Crystal Growth Processes Based on Capillarity, 355–411. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9781444320237.ch6.

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Тези доповідей конференцій з теми "Dewetting processes"

Stephan, Peter. "INFLUENCES OF DYNAMIC WETTING AND DEWETTING PROCESSES ON EVAPORATIVE HEAT TRANSFER." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.kn.000025.

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Marlow, Frank, and Mulda Muldarisnur. "Colloidal crystal formation: nano-dewetting and the assembly process." In SPIE Photonics Europe, edited by Dario Gerace, Gabriel Lozano, Christelle Monat, and Sergei G. Romanov. SPIE, 2016. http://dx.doi.org/10.1117/12.2230667.

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Dwiyantoro, Bambang Arip, and Shiu-Wu Chau. "The dynamic behavior of droplet formation on micropillar surface during a dewetting process." In 2012 IEEE 12th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2012. http://dx.doi.org/10.1109/nano.2012.6322040.

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Dwiyantoro, Bambang Arip. "Modeling of the dependence of nanodroplet size on the parameters governing the dewetting process on square micropillar." In 5TH NANOSCIENCE AND NANOTECHNOLOGY SYMPOSIUM (NNS2013). AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4866731.

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Bakhtiyarov, Sayavur I., and Dennis A. Siginer. "Rheometric Studies of New Class Ionic Liquid Nanolubricants." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72545.

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The traditional lubricating materials used in space, such as mineral oils, polyol ester, PFPE, Pennzane, etc. have limited lifetimes in vacuum due to the catalytic degradation on metal surfaces, high vaporization at high temperatures, dewetting, and other disadvantages. The lubricants for the space applications must have vacuum stability (i.e. low vapor pressure), high viscosity index (wide liquid range), low creep tendency, good elastohydrodynamic and boundary lubrication properties, radiation atomic oxygen resistance, optical or infrared transparency. Thermophysical and chemical analyses are another important required set of tests for the newly developed space lubricants. Some of these properties for liquid lubricants are base oil and additive volatility, creep, surface tension, viscosity, chemical composition, weight loss, density, vapor pressure, etc. Unfortunately, the properties such as non-linearity in the rheological behavior of the lubricants were not studied well for newly developed systems. The rheological properties are crucial to analyzing thermodynamic and energy dissipative aspects of the lubrication process. The rheological measurements for the newly developed ionic liquid nanolubricant were conducted using rotational rheometer AES G-2 of “parallel-plates” mode.

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Herescu, Alexandru, and Jeffrey S. Allen. "Film Deposition in Non-Wetting Tubes: An Experimental Film Thickness Law." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50217.

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Deposition of a liquid film on non-wetting tubular surfaces gives rise to the unexpected behavior of simultaneously coexisting thick and thin films. Experiments show that a discontinuity in the film thickness, a jump between the thick and thin films being laid from the meniscus towards the bounding moving contact line, occurs after a considerably thicker than the expected Bretherton film is deposited. Bretherton assumed the film to be uniform and, unlike the case of a non-wetting surface, the visco-capillary deposition process was not affected by the presence of a contact line. In reality this phenomenon lies at the confluence between a dewetting process and the deposition itself, being the result of the influence claimed by the dynamics of the zone adjacent to the moving contact line. The film thickness is calculated directly from the experimental data and a correlation is obtained by matching the measured and the theoretical shock velocities associated with the hydraulic jump. The non-wetting film is significantly thicker than Bretherton’s prediction and follows in turn a different law which is determined experimentally. The non-wetting film thickness is found to vary as hR4/3, hR being the Ca-dependent non-dimensional Bretherton film thickness.

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Arcondéguy, A., G. Montavon, A. Denoirjean, B. Pateyron, A. Grimaud, G. Gasgnier, C. Huguet, and M. P. Planche. "Flame-Spray Parameter Optimization to Manufacture Glaze Coatings Onto Thermally Sensitive Substrates." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1315.

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Abstract Glazes are attractive materials as they can be applied onto metallic or ceramic substrates to confer on them specific properties. They find numerous applications, from art ornamenting to protection against corrosion. Conventional process (vitreous glazing) requires a high temperature treatment (up to 1400 °C in some cases) to fuse glazes after their application on the surface to be covered. This treatment cannot be hence applied onto heat-sensitive substrates without severe degradation. Previous studies showed that manufacturing glaze layers by flame spraying prevents the substrate from thermal degradation. The coating formation mechanisms are different from the ones encountered with crystallized ceramic materials: the high surface tension of glazes prevents the particles from being totally spread (i.e., "dewetting" phenomena). Effects of glaze powder characteristics (chemical composition, particles morphology) on coatings structures were also studied. Furthermore, chemical analyses proved that flame spraying did not modify glaze compositions. The most adapted powder to flame spraying has been hence selected. This contribution describes the coating formation mechanism and discusses the influence of the feedstock powder physical properties on coating characteristics. It also estimates effects of spraying parameters on coatings morphology.

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