Relevant bibliographies by topics / Thermal Dewetting

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Academic literature on the topic 'Thermal Dewetting'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Thermal Dewetting"

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Gamboa, Arielle R., Michael P. Nitzsche, Valeria Saro-Cortes, Tianxing Ma, Lin Lei, and Jonathan P. Singer. "Thermocapillary Multidewetting of Thin Films." MRS Advances 3, no. 18 (2018): 977–82. http://dx.doi.org/10.1557/adv.2018.327.

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ABSTRACTThermocapillary dewetting of liquids and molten films has recently emerged as a viable alternative to conventional microprocessing methods. As this thermal gradient-induced mechanism is universal, it can be applied to any material. This work explores the sequential dewetting of materials with varying melting points, including polymers and metals, to create aligned morphologies. The variation in melting point allows for the dewetting of single layers at a time or mobility-limited simultaneous dewetting. As a result, a variety of multimaterial structures can be produced with built-in alignment, such as arrays of concentric circles, lines with periodic segmentation, or islands on holes. This approach employs photothermal methods to induce the necessary thermal gradient, manipulating several variables in order to influence the consequent structures. Adjusting laser power and light intensity allows for the control of temperature for selective dewetting of films; altering beam size and exposure time affects the extent of dewetting in terms of diameter size; overlap effects and simultaneous dewetting can result in complex architectures. This controlled writing of patterns also presents a technique to create both masks at low temperatures for conductive multilayers as well as templates for electrospray deposition.
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Bonvicini, Stephanie Nicole, Bo Fu, Alison Joy Fulton, Zhitai Jia, and Yujun Shi. "Formation of Au, Pt, and bimetallic Au–Pt nanostructures from thermal dewetting of single-layer or bilayer thin films." Nanotechnology 33, no. 23 (March 17, 2022): 235604. http://dx.doi.org/10.1088/1361-6528/ac5a83.

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Abstract Formation of Au, Pt, and bimetallic Au–Pt nanostructures by thermal dewetting of single-layer Au, Pt and bilayer Au–Pt thin films on Si substrates was systematically studied. The solid-state dewetting of both single-layer and bilayer metallic films was shown to go through heterogeneous void initiation followed by void growth via capillary agglomeration. For the single-layer of Au and Pt films, the void growth started at a temperature right above the Hüttig temperature, at which the atoms at the surface or at defects become mobile. Uniformly distributed Au (7 ± 1 nm to 33 ± 8 nm) and Pt (7 ± 1 nm) NPs with monodispersed size distributions were produced from complete dewetting achieved for thinner 1.7−5.5 nm thick Au and 1.4 nm thick Pt films, respectively. The NP size is strongly dependent on the initial thin film thickness, but less so on temperature and time. Thermal dewetting of Au–Pt bilayer films resulted in partial dewetting only, forming isolated nano-islands or large particles, regardless of sputtering order and total thin film thickness. The increased resistance to thermal dewetting shown in the Au–Pt bilayer films as compared to the individual Au or Pt layer is a reflection of the stabilizing effect that occurs upon adding Pt to Au in the bimetallic system. Energy dispersive x-ray spectroscopic analysis showed that the two metals in the bilayer films broke up together instead of dewetting individually. According to the x-ray diffraction analysis, the produced Au–Pt nanostructures are phase-segregated, consisting of an Au-rich phase and a Pt-rich phase.
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Kwak, Taejin, and Dongchoul Kim. "Controlling Equilibrium Morphologies of Bimetallic Nanostructures Using Thermal Dewetting via Phase-Field Modeling." Materials 14, no. 21 (November 7, 2021): 6697. http://dx.doi.org/10.3390/ma14216697.

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Herein, we report a computational model for the morphological evolution of bimetallic nanostructures in a thermal dewetting process, with a phase-field framework and superior optical, physical, and chemical properties compared to those of conventional nanostructures. The quantitative analysis of the simulation results revealed nano-cap, nano-ring, and nano-island equilibrium morphologies of the deposited material in thermal dewetting, and the morphologies depended on the gap between the spherical patterns on the substrate, size of the substrate, and deposition thickness. We studied the variations in the equilibrium morphologies of the nanostructures with the changes in the shape of the substrate pattern and the thickness of the deposited material. The method described herein can be used to control the properties of bimetallic nanostructures by altering their equilibrium morphologies using thermal dewetting.
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Pangpaiboon, Nampueng, and Nisanart Traiphol. "Dewetting Suppression of Polystyrene Thin Film Using Titanium Dioxide Nanoparticles." Key Engineering Materials 608 (April 2014): 218–23. http://dx.doi.org/10.4028/www.scientific.net/kem.608.218.

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Effects of titanium dioxide nanoparticles on thermal stability of polymeric thin film are investigated in this study. Polystyrene with molecular weight of 52,000 g/mol is used as a base polymer. The concentrations of titanium dioxide nanoparticles in polystyrene are varied from 0-0.20 wt.%. Films are fabricated by spin casting on Si wafer substrate and annealed at 180 °C and 190 °C for various times in order to study dynamics of dewetting. Film morphologies are analysed by optical microscopy and atomic force microscopy. Dewetting areas of each film as a function of annealing time are determined. It is found that addition of titanium dioxide nanoparticles suppresses dewetting in polystyrene film with thicknesses of ~30 nm and ~100 nm. The same titanium dioxide amounts, on the other hand, accelerate dewetting process in the film with thickness of ~265 nm. Mechanisms of dewetting suppression in polymeric film by titanium dioxide nanoparticles are discussed.
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Andrikaki, Sonia, Katerina Govatsi, Spyros N. Yannopoulos, George A. Voyiatzis, and Konstantinos S. Andrikopoulos. "Thermal dewetting tunes surface enhanced resonance Raman scattering (SERRS) performance." RSC Advances 8, no. 51 (2018): 29062–70. http://dx.doi.org/10.1039/c8ra05451g.

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Beshr, M., E. Dexter, P. E. Tierney, A. D. Meade, S. Murphy, and G. Amarandei. "Towards plasmon mapping of SERS-active Ag dewetted nanostructures using SPELS." Journal of Physics: Conference Series 2172, no. 1 (February 1, 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2172/1/012012.

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Abstract Thermal dewetting of silver thin flm can lead to SERS-active Ag nanoparticles. Here, we report our progress towards using scanning probe energy loss spectroscopy (SPELS) to map the plasmonic behaviour of SERS-active Ag nanoparticles (NP) by investigating NPs produced through the dewetting study of Ag thin flms on SiO2/Si and Ti/SiO2/Si substrates. The nanoparticles size and spatial distribution were controlled by the deposition and thermal annealing parameters. The results of preliminary SPELS measurements of these structures, alongside SERS data show that there is a correlation between the Raman enhancement and the nanoparticle size and interparticle spacing.
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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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Potejanasak, Potejana, Masahiko Yoshino, Motoki Terano, and Masahiro Mita. "Efficient Fabrication Process of Metal Nanodot Arrays Using Direct Nanoimprinting Method with a Polymer Mold." International Journal of Automation Technology 9, no. 6 (November 5, 2015): 629–35. http://dx.doi.org/10.20965/ijat.2015.p0629.

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A new fabrication process of metal nanodot arrays using the thermal dewetting method was developed in this study. This process was comprised of three steps: thin Au film deposition on a quartz glass substrate, groove patterning by direct nanoimprinting, and self-organization of metal nanodot arrays by thermal dewetting. A new idea to utilize a polymer film mold for groove patterning by direct nanoimprinting was examined. The polymer film mold was prepared by hot-embossing groove patterns of a mother mold on a cyclo olefin polymer (COP) film. The mother mold was prepared from a silicon wafer. The polymer film mold was used for direct nanoimprinting on a metal film deposited on a quartz substrate. The experimental results revealed that the COP film mold can effectively form a micro groove pattern on the Au film despite the COP film mold being softer than the Au film. The micro groove on the Au film was also found to be effective in aligning the nanodots in lines. The micro groove patterning using the COP film mold was also confirmed to be useful in controlling the dot size and alignment during the thermal dewetting process.
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Potejanasak, Potejana, Masahiko Yoshino, and Motoki Terano. "Fabrication of Metallic Nanodot Arrays Using Nano-Chemical Stamping Technique with a Polymer Stamp." International Journal of Automation Technology 10, no. 5 (September 5, 2016): 794–803. http://dx.doi.org/10.20965/ijat.2016.p0794.

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The aim of this study is to develop metallic nanodot arrays with controlled morphology and alignment. To produce gold nanodot arrays with high throughput, the authors propose a new efficient fabrication process based on the templated thermal dewetting method, using a nano-chemical stamping technique with a polymer mold. This process comprises four steps: sputter etching on a quartz glass substrate, patterning of micrometer size by printing with acetone on the substrate by stamping with a polymer film stamp, deposition of a thin Au film on the substrate, and self-organization of the metal nanodot arrays by thermal dewetting. A new method, using a cyclo-olefin polymer film mold for chemical patterning by nano-chemical stamping, was examined. Since the acetone stamped on the substrate reduces the surface energy and affects the contact angle of the gold nanodots, the gold nanodots are distributed along the stamped pattern. It is found that the pattern stamped with acetone on the substrate works as a template for the thermal dewetting process. The nano-chemical stamping technique is useful in controlling the size and distribution of the nanodots.
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Clarke, Christian, Deming Liu, Fan Wang, Yongtao Liu, Chaohao Chen, Cuong Ton-That, Xiaoxue Xu, and Dayong Jin. "Large-scale dewetting assembly of gold nanoparticles for plasmonic enhanced upconversion nanoparticles." Nanoscale 10, no. 14 (2018): 6270–76. http://dx.doi.org/10.1039/c7nr08979a.

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Dissertations / Theses on the topic "Thermal Dewetting"

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Nguyen, Nhat Truong [Verfasser], and Patrik [Gutachter] Schmuki. "Organized Thermal Dewetting of Noble Metals: Establishing Enhanced Co-Catalytic Activity for Photocatalysis on TiO2 Nanotubes / Nhat Truong Nguyen ; Gutachter: Patrik Schmuki." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1143231988/34.

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Vree, Christian. "Topographie, Struktur und Dynamik thermisch aufgedampfter Polymerfilme." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B497-3.

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Books on the topic "Thermal Dewetting"

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Damman, P. Instability of thin films. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198789352.003.0008.

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We will first discuss the stability of liquid films deposited on solid surfaces with an emphasis on the nature of intermolecular forces and thermal fluctuations that conspire to generate complex morphologies. We will see how the global dewetting dynamics is driven by the solid–fluid interface and that dewetting can be a powerful tool to study the nanorheology of complex fluids, such as polymer melts in ultra thin films. In the second part, we will consider thin elastic sheets constrained by mechanical forces. The canonical example of such a system is given by a simple paper ball. We will see how the global geometry of these constraints drastically affects the final shape adopted by the sheet.
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Conference papers on the topic "Thermal Dewetting"

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O’Keeffe, Niall, Cormac Eason, Ryan Enright, and Mark Davies. "Effective Wetting and Dewetting of a Superhydrophobic Surface Under Dynamic Thermal Conditions." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88598.

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In this paper the interfacial characteristics of a liquid flowing over a 1cm2 array of hydrophobic cylindrical micropillars located within a microchannel are investigated. The microchannel was 12mm wide and 32mm long with an average channel height of approximately 83μm. Hydrophobic coating of the channel was achieved via a controlled flow of a trichlorosilane and ethanol solution. A method to remove lodged gas bubbles from a microchannel was successfully demonstrated, while maintaining the favorable Cassie-Baxter wetting state (gas/vapor layer present) of the micropillar structures. This was achieved using degassed water to dissolve low-curvature gas bubbles, while ohmically heating the silicon substrate to reassert and maintain the Cassie-Baxter wetting state of the hydrophobic micropillars. During this experimentation it was discovered that the part wetting and dewetting of a superhydrophobic (SH) surface within a microchannel could be achieved using similar methods. The onset of surface wetting (Wenzel wetting state) was achieved by pumping degassed water through the microchannel. Surface dewetting was then accomplished through substrate heating by the increase in the trapped gas layer pressure, the water vapor pressure and outgassing from the lightly degassed fluid. These reactions force the gas/vapor layer to expand laterally throughout the micropillar array, thus restoring the Cassie-Baxter wetting state. The reported results demonstrate a low-power method for effectively reversing the Wenzel wetting state of a SH surface under microchannel flow conditions and may prove to be a useful technique for manipulating fluid flow within microfluidic devices.
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Chang, T. W., H. Jin, and G. L. Liu. "Light trapping and enhancing gold nanoparticle array substrates made by thermal dewetting technique." In SPIE NanoScience + Engineering, edited by Hooman Mohseni, Massoud H. Agahi, and Manijeh Razeghi. SPIE, 2012. http://dx.doi.org/10.1117/12.930035.

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Okubo, Kyohei, Yusuke Niimura, Naoto Oonishi, Loan Le Thi Ngoc, and Edwin T. Carlen. "Nanofabrication technology for single-crystalline metal nanoparticle ensembles using nanotemplate-guided thermal dewetting." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2018. http://dx.doi.org/10.1364/jsap.2018.18p_211b_11.

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Kim, Tae Jin, Phillip Glass, and Carlos H. Hidrovo. "Thermo-Wetting and Friction Reduction Characterization of Microtextured Superhydrophobic Surfaces." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44358.

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Microtextured superhydrophobic surfaces have become ubiquitous in a myriad of engineering applications. These surfaces have shown potential in friction reduction applications and could be poised to make a big impact in thermal management applications. For instance higher heat transfer rate with less pumping power might be achievable through the aid of superhydrophobic surfaces. However, past and current research on superhydrophobic surface has focused mainly on modifying either the chemical component or the roughness factors of such surfaces. The purpose of this paper is to account for the thermal effects of the heated fluid flowing in superhydrophobic microfluidic channels. Herein we characterize the wetting behavior as a function of temperature of microtextured superhydrophobic surfaces, for both active and passive thermal management applications. A series of PDMS microtextured samples were fabricated using micromachining and soft lithography techniques. Flow measurements were performed using the superhydrophobic microfluidic channel. The channel surface roughness was large enough to induce the Cassie-Baxter state, a phenomenon in which a liquid rests on top of a textured surface with a gas layer trapped underneath the liquid layer. This gas layer induces a two-phase flow, and friction reduction can be achieved for the liquid channel flow. With this channel, flow rates were measured by varying the equilibrium temperature of the substrate. The temperature in the constant pressure source was controlled by circulating the water through a water-bath. As the heating reached a certain threshold the curvature of the liquid-gas interface was reversed and dewetting of the penetrated liquid layer was observed. This result suggests that the Cassie state in fluid flow can be prolonged even under increased pressure drops by increasing the temperature in the gas layer.
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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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