Relevant bibliographies by topics / Microstructured

Academic literature on the topic 'Microstructured'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Microstructured"

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Gong, Jian Liang, Bin Gang Xu, Hua Yang Yu, and Xiao Ming Tao. "Novel Honeycomb-Microstructured Asphalt Composite Coatings for Sustainable Photocatalytic Application." Advanced Materials Research 905 (April 2014): 310–13. http://dx.doi.org/10.4028/www.scientific.net/amr.905.310.

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The microstructure of asphalt materials on photocatalytic performance was studied in this work. Firstly, asphalt composite coatings with highly ordered honeycomb microstructures were fabricated by a bottom-up approach through adjusting the solution concentration and the content of polystyrene (PS) additive. Further incorporation of titanium dioxide (TiO2) nanoparticles endows the porous coatings with photocatalytic functionality. SEM images demonstrate that TiO2nanoparticles disperse and decorate on the pore walls of coating. In comparison to the compact coatings prepared by traditional method, the obtained honeycomb microstructured asphalt/PS/TiO2coatings possess an enhanced and sustainable efficiency of removing NOx. Specifically, when introducing porous microstructures to the coating, the NOxreduction efficiency is 16% higher than that of traditional compact sample and shows no attenuation in continuous use.
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Zhao, Chang Song, Jun Yong Wu, Fan Zhong Chu, Kai Rui Zhao, and Lei Yu. "Study on Preparation of Microstructured Optical Membrane." Key Engineering Materials 861 (September 2020): 159–64. http://dx.doi.org/10.4028/www.scientific.net/kem.861.159.

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Micro-structured optical film is one of the micro-optical elements and has a great market demand. This article studies the microstructured optical film formed by UV imprinting: The influence of embossing pressure on microstructure replication accuracy was explored. The larger the pressure, the better the material filling. When the pressure is 5N, the microstructure replication is complete; The relationship between the radiation intensity and warpage deformation was explored, and the decrease in the intensity of the UV light source can effectively reduce the warpage deformation; The influence of the material formula on the optical properties of the product was explored. When the oligomer content was 55%, the film had a high light transmittance. At the same time, the prepared film was subjected to an apparent inspection with good microstructure replication accuracy.Microstructured optical elements are widely used in optical fields such as semiconductors, lasers, beam shaping [1-2] and solar energy [3-5] due to their unique advantages such as small size and high performance. As a key component in many industries, it has a high market demand rate. However, the microstructure forming process is complicated, the manufacturing cost is high, and the accuracy is difficult to guarantee, which has restricted its development. With the advancement of science and technology and the increase in market demand, more and more researchers and enterprises have put their eyes on the research of preparing micro-structured optical elements.At present, the commonly used microstructures are mainly icrolens array [6-8], and the processing methods include micro-imprinting [9-10], etching [11], electron beam direct writing, and micro-injection [12], etc. This article studies the UV-curing embossing process in micro-embossing. This processing method has the advantages of fast molding, high efficiency, and environmental protection. And this process is conducive to mass production and has a broad market application prospect.In this paper, the forming process and material formulation of microstructured optical film prepared by light-cured micro-imprinting were investigated, and the microstructure morphology of the preparation was analyzed apparently.
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Sun, Jiazhen, Chenghu Yun, Bo Cui, Pingping Li, Guangping Liu, Xin Wang, and Fuqiang Chu. "A Facile Approach for Fabricating Microstructured Surface Based on Etched Template by Inkjet Printing Technology." Polymers 10, no. 11 (October 31, 2018): 1209. http://dx.doi.org/10.3390/polym10111209.

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Microstructures are playing an important role in manufacturing functional devices, due to their unique properties, such as wettability or flexibility. Recently, various microstructured surfaces have been fabricated to realize functional applications. To achieve the applications, photolithography or printing technology is utilized to produce the microstructures. However, these methods require preparing templates or masks, which are usually complex and expensive. Herein, a facile approach for fabricating microstructured surfaces was studied based on etched template by inkjet printing technology. Precured polydimethylsiloxane substrate was etched by inkjet printing water-soluble polyacrylic acid solution. Then, the polydimethylsiloxane substrate was cured and rinsed, which could be directly used as template for fabricating microstructured surfaces. Surfaces with raised dots, lines, and squares, were facilely obtained using the etched templates by inkjet printing technology. Furthermore, controllable anisotropic wettability was exhibited on the raised line microstructured surface. This work provides a flexible and scalable way to fabricate various microstructured surfaces. It would bring about excellent performance, which could find numerous applications in optoelectronic devices, biological chips, microreactors, wearable products, and related fields.
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Zhang, Dawei, Haiyang Li, Xiaoli Chen, Hongchang Qian, and Xiaogang Li. "Effect of Surface Microstructures on Hydrophobicity and Barrier Property of Anticorrosive Coatings Prepared by Soft Lithography." Advances in Materials Science and Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/342184.

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Enhancing the hydrophobicity of organic coatings retards their interaction with water and often leads to better protectiveness over metal corrosion. In this study, a soft lithography method was used to prepare epoxy coatings which showed surface microstructures in high replication to sandpapers. The effect of microstructures on coating’s hydrophobicity and barrier property was investigated. Compared to flat coatings, the microstructured coatings showed much higher water contact angles, which further increased with finer sandpapers. Determined by electrochemical impedance spectroscopy (EIS), the flat coating exhibited a higher anticorrosive performance than the microstructured coatings. With the use of finer sandpaper, the groove size of the corresponding microstructured coating was reduced. And a lower anticorrosive performance was observed since more defects might be formed in a given area of coating during the imprinting process. As the groove size of the coatings was further decreased to 5.7 µm, the microstructures became too small for water to easily penetrate through. Therefore, trapped air acted as an additional barrier and contributed to an increased anticorrosive performance compared to other microstructured coatings.
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Talmon, Yeshayahu. "Cryo-TEM of amphiphilic polymer and amphiphile/polymer solutions." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 876–77. http://dx.doi.org/10.1017/s0424820100150216.

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To achieve complete microstructural characterization of self-aggregating systems, one needs direct images in addition to quantitative information from non-imaging, e.g., scattering or Theological measurements, techniques. Cryo-TEM enables us to image fluid microstructures at better than one nanometer resolution, with minimal specimen preparation artifacts. Direct images are used to determine the “building blocks” of the fluid microstructure; these are used to build reliable physical models with which quantitative information from techniques such as small-angle x-ray or neutron scattering can be analyzed.To prepare vitrified specimens of microstructured fluids, we have developed the Controlled Environment Vitrification System (CEVS), that enables us to prepare samples under controlled temperature and humidity conditions, thus minimizing microstructural rearrangement due to volatile evaporation or temperature changes. The CEVS may be used to trigger on-the-grid processes to induce formation of new phases, or to study intermediate, transient structures during change of phase (“time-resolved cryo-TEM”). Recently we have developed a new CEVS, where temperature and humidity are controlled by continuous flow of a mixture of humidified and dry air streams.
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Bongarala, Manohar, Han Hu, Justin A. Weibel, and Suresh V. Garimella. "Microlayer evaporation governs heat transfer enhancement during pool boiling from microstructured surfaces." Applied Physics Letters 120, no. 22 (May 30, 2022): 221602. http://dx.doi.org/10.1063/5.0090156.

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Enhancement of the rate of boiling heat transfer, a critically significant need across a range of industrial transport processes, can be achieved by the introduction of surface microstructures. However, the precise mechanism of such enhancement is not definitively understood. We establish microlayer evaporation from the imbibed liquid layer underneath the growing vapor bubbles as the key mechanism of enhancement in boiling heat transfer coefficient for microstructured surfaces. We experimentally characterize nucleate boiling heat transfer performance on silicon surfaces custom-fabricated with controlled microstructures using HFE-7100 as the working fluid. We then undertake an analytical prediction of the microlayer evaporation from the microstructured surface. A clear dependence of the measured boiling heat transfer coefficients from microstructures of different dimensions on the predicted evaporation heat transfer coefficients allows us to conclude that microlayer evaporation governs the boiling enhancement from microstructured surfaces.
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Hu, Guohong, Fengli Huang, Chengli Tang, Jinmei Gu, Zhiheng Yu, and Yun Zhao. "High-Performance Flexible Piezoresistive Pressure Sensor Printed with 3D Microstructures." Nanomaterials 12, no. 19 (September 29, 2022): 3417. http://dx.doi.org/10.3390/nano12193417.

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Flexible pressure sensors have been widely used in health detection, robot sensing, and shape recognition. The micro-engineered design of the intermediate dielectric layer (IDL) has proven to be an effective way to optimize the performance of flexible pressure sensors. Nevertheless, the performance development of flexible pressure sensors is limited due to cost and process difficulty, prepared by inverted mold lithography. In this work, microstructured arrays printed by aerosol printing act as the IDL of the sensor. It is a facile way to prepare flexible pressure sensors with high performance, simplified processes, and reduced cost. Simultaneously, the effects of microstructure size, PDMS/MWCNTs film, microstructure height, and distance between the microstructures on the sensitivity and response time of the sensor are studied. When the microstructure size, height, and distance are 250 µm, 50 µm, and 400 µm, respectively, the sensor shows a sensitivity of 0.172 kPa−1 with a response time of 98.2 ms and a relaxation time of 111.4 ms. Studies have proven that the microstructured dielectric layer printed by aerosol printing could replace the inverted mold technology. Additionally, applications of the designed sensor are tested, such as the finger pressing test, elbow bending test, and human squatting test, which show good performance.
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Baum, Martina J., Lars Heepe, Elena Fadeeva, and Stanislav N. Gorb. "Dry friction of microstructured polymer surfaces inspired by snake skin." Beilstein Journal of Nanotechnology 5 (July 21, 2014): 1091–103. http://dx.doi.org/10.3762/bjnano.5.122.

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The microstructure investigated in this study was inspired by the anisotropic microornamentation of scales from the ventral body side of the California King Snake (Lampropeltis getula californiae). Frictional properties of snake-inspired microstructured polymer surface (SIMPS) made of epoxy resin were characterised in contact with a smooth glass ball by a microtribometer in two perpendicular directions. The SIMPS exhibited a considerable frictional anisotropy: Frictional coefficients measured along the microstructure were about 33% lower than those measured in the opposite direction. Frictional coefficients were compared to those obtained on other types of surface microstructure: (i) smooth ones, (ii) rough ones, and (iii) ones with periodic groove-like microstructures of different dimensions. The results demonstrate the existence of a common pattern of interaction between two general effects that influence friction: (1) molecular interaction depending on real contact area and (2) the mechanical interlocking of both contacting surfaces. The strongest reduction of the frictional coefficient, compared to the smooth reference surface, was observed at a medium range of surface structure dimensions suggesting a trade-off between these two effects.
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Guo, Bing, Qing Liang Zhao, Yan Hou, Cheng Ge, and Xin Yu. "Ultrasonic Vibration Assisted Grinding of Microstructures on Binderless Tungsten Carbide (WC)." Key Engineering Materials 625 (August 2014): 475–79. http://dx.doi.org/10.4028/www.scientific.net/kem.625.475.

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Microstructured optical elements made of glass are generally replicated by hot pressing with super-hard materials, such as binderless tungsten carbide (WC) and precision ceramic. However, in grinding of microstructures, problems frequently occur in terms of rough ground surface, chipping and rounding of micro-structures edges when compared to conventional grinding. In order to overcome these technological constraints, a promising precision grinding method for microstructured surfaces that applies ultrasonic vibration to improve the surface quality, and protect the edges and tips of microstructured surfaces is presented. The experimental investigation of ultrasonic vibration assisted grinding of microstructures on binderless WC is researched. The effects of ultrasonic vibration on surface roughness, form accuracy and edge radius were analyzed. The morphology of surface and array edges was examined with a scanning electron microscope (SEM), while the surface roughness was measured by a laser interferometer. And a contact probe profilometer was used to assess the form of array and radius of microstructured edges. Experimental results showed that the application of ultrasonic vibration leads to significant improvements of the surface roughness and edges of microstructures compared with traditional precision grinding processes. A micro cylinder lens array of binderless WC with surface roughness of 78nm and edge radius of less than 1μm was obtained. The novel grinding method is feasible and applicable in machining higher form accuracy microstructures.
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Lazauskas, Algirdas, Viktoras Grigaliūnas, and Dalius Jucius. "Recovery Behavior of Microstructured Thiol-Ene Shape-Memory Film." Coatings 9, no. 4 (April 20, 2019): 267. http://dx.doi.org/10.3390/coatings9040267.

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In this work, surface microstructurization was coupled with shape-memory polymer to generate reversibly tunable surface properties. A photopolymerizable thiol-ene composition comprising a mixture of pentaerythritol tetrakis(3-mercaptopropionate) (PETMP), 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (TTT) and 2,2-dimethoxy-2-phenylacetophenone (DMPA) was used to prepare microstructured thiol-ene shape-memory film via casting and UV polymerization on the electron beam lithography fabricated arrays of 1 µm and 2 µm square pits. The mechanical deformation via compression and recovery of the surface microstructure were investigated. Results show that, after heat treatment of the deformed thiol-ene film, the recovery yields for microstructures were not worse than 90% ± 2% and 93% ± 2% for structures imprinted with 1 µm and 2 µm square pit micro imprint stamps. Additionally, heat treatment of deformed thiol-ene film resulted in the recovery of intense diffraction colors and laser diffraction patterns. This study opens up an avenue of incorporating microstructured shape-memory films for new products, e.g., optical security devices, superhydrophobic coatings, medical diagnostics and biosensors.
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Dissertations / Theses on the topic "Microstructured"

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Wan, Yu Shan Susanna. "Zeolite microstructured reactors." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405836.

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Jin, Chuhang. "Microstructured Terahertz Fiber." Thesis, KTH, Tillämpad fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265667.

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Aqil, Sanaa. "Wetting of microstructured surfaces." Thesis, Nottingham Trent University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431843.

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Suhailin, Fariza Hanim Binti. "Microstructured silicon fibre devices." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/405516/.

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Silicon photonics is an advanced platform for the development of compact integrated optical devices. Major breakthroughs such as light generation, signal amplification and high-speed modulation have been demonstrated in silicon waveguides due to their large nonlinear effects. Recent fabrication methods have enabled the infiltration of crystalline and amorphous semiconductor materials inside silica capillaries to combine the excellent optoelectronic properties of silicon with the waveguiding capabilities of fibres. This new class of waveguide maintains many of the advantageous properties of commercial silica glass fibres such as robustness and flexibility, as well as offering the potential for seamless integration within existing networks. Furthermore, the silicon fibre platform can also be post-processed to fabricate novel micron-scale devices, beyond what is achievable in their planar counterparts. In this thesis, two forms of fibre-based semiconductor devices have been investigated; tapered silicon core waveguides and whispering gallery mode microresonators. These devices were fabricated as a unique approach to enhance the light-matter interactions for the development of all-optical signal processing devices. Improvements in the crystallinity and the optical transmission properties of polysilicon core fibres were achieved via fibre tapering, enabling the first demonstration of nonlinear propagation in this material. Moreover, different forms of resonators were fabricated from amorphous and polycrystalline silicon core fibres. Ultrafast all-optical modulation via the Kerr nonlinearity is demonstrated at picoseconds switching speeds using pure amorphous silicon resonators and in hybrid silica glass and polysilicon core resonators.
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Dubert, Diana Cristina. "Catalyser production with microstructured components." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/79151.

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La tesis describe un método completamente nuevo sobre la aplicación de este micro-tecnología en la producción de los catalizadores, específicamente NH4-dawsonite. Las soluciones acuosas utilizadas para precipitar el material se define como nonahidrato nitrato de aluminio y carbonato de amonio. La preparación del mineral análogo se realizó por primera vez dentro de un micro-mezclador de acero inoxidable (CPMM 1200/8) con un volumen de 78μl y un principio de mezcla “split-recombine”, optimizando los parámetros del proceso para un tiempo de producción continuo que, en este caso, es significativamente afectado por la obstrucción del micro-canal. Además, la síntesis se realizó dentro del micro-sistema presurizado y se han propuesto otro tres diferentes geometrías del micro-canal: en forma de T de acero inoxidable, el poly (metylmetacrylate) (PMMA) spilt-recombine del micromixer Caterpillar y en forma de Y la unión de PMMA dos regímenes diferentes de mezcla (perfecta (spilt-recombine) / imperfecto (T / Y en forma de microsistemas)) con el objetivo de minimizar la obstrucción del canal. El enfoque de unión-Y se ha demostrado ser la mejor alternativa para reducir al mínimo la deposición de partículas en la pared del canal, lo que implica un mejor control del fenómeno de obstrucción, al estar totalmente eliminado. Esto representa un paso adelante en el proceso de intensificación con beneficios en la industria. Al superar este paso, la posibilidad de transferir esta nueva tecnología en la industria es cada vez más tangible a convertirse en realidad.
The thesis presents a new approach regarding the application of microtechnology in production of catalysts, specifically NH4-dawsonite by using microreactor technology. The aqueous solutions used to precipitate the material were defined as aluminium nitrate nonahydrate and ammonium carbonate. The mineral analogue preparation was first held within a 78μl volume split-recombine stainless steel micromixer (CPMM 1200/8 mixer) by optimizing the process parameters for a continuous time of production which in the present case is significantly affected by the channel clogging. Further, the synthesis was carried out within a pressurized micro-system and different geometries of the microchannel: T-shaped stainless steel, poly(metylmetacrylate) (PMMA) spilt-recombine Caterpillar micromixer and Y-shaped PMMA junction with two different mixing regimes (perfect (spli-recombine)/imperfect (T/Y-shaped microsystem)) with the aim of minimizing the clogging. The Y-junction approach was demonstrated to be a great alternative for minimizing the particle deposition on channel’s wall, clogging phenomenon being totally removed. This represents a significant step forward in process intensification with benefits within the industry. Over passing this step the possibility to transfer this new technology into industry is more and more tangible to become reality.
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Ager, C. D. "Plasmons in microstructured semiconductor 2DEGs." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385904.

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Li, Qingquan. "Microstructured optical fibres in chalcogenide glass." Thesis, University of Nottingham, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602615.

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Chalcogenide glasses offer transmission windows within the far-visible, near- and midinfrared (IR) range. They exhibit potentially excellent linear and large non linear optical properties, photosensitivity and their low phonon energies are conducive to efficient dopant rare earth transitions. These properties enable many potential infrared applications: large-scale optics; fibreoptics; integrated optics; optical imaging; optical data storage and all-optical switching. Two lines of experimental work were followed in this project based on chalcogenide glasses, as below: (1) Antimony was used to replace arsenic, to fOIm the ternary Ge-Sb-Se glass system. Nine compositions of Ge-Sb-Se glasses were synthesised and characterised to reveal their glass forming abilities, thermal properties and optical properties. Glass pairs, with close thermal propeIties and relatively high refractive index contrast, were developed for fabricating core-clad. structure step index fibre and micro structured optical fibres (MOFs). (2) Fabrication of an all-solid chalcogenide glass micro structured fibre (MOF), which was designed as a mimic of the holey suspended structure silica MOF, was canied out. A cane-drawing technique and a real-time contactless diameter monitor of the chalcogenide canes were developed to improve the precision of the fabrication. Stacking equipment was designed to improve the technique of the chalcogenide preform stacking.
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Chang, Jean H. "Tunable wettability of microstructured polypyrrole films." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62526.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 85-90).
This thesis presents the development of the conducting polymer polypyrrole as a viable material for applications requiring switchable wettability. A fabrication procedure that produces robust microstructured polypyrrole (PPy) that quickly and reversibly switches between the superhydrophobic and superhydrophilic states is discussed. The polymer is doped with perfluorooctanesulfonate ions which diffuse in and out of the film upon an electric stimulus, causing a change in the material's surface energy. The effect of changing different deposition parameters on the switchable wettability of the polymer is also investigated. A post-deposition thermal treatment that improves the electrochemical properties of polypyrrole is presented. Finally, a device that allows for the in situ wettability switch of PPy is developed, eliminating the need for polypyrrole to be immersed in an electrolyte in order to switch between wetting states. A wettability gradient created on the surface of PPy using the device is used to demonstrate a possible application requiring induced fluid movement. Electrochemical techniques are used to synthesize and characterize the polymers, and scanning electron microscopy is used to examine the surface morphology of the films.
by Jean H. Chang.
S.M.
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Constantinou, A. "CO2 absorption in microstructured membrane reactors." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1348316/.

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The objective of this work is to study experimentally and theoretically novel multiphase microreactors and characterize them in relation to hydrodynamics and mass transfer, in order to evaluate, understand and improve their performance. In order to achieve this CO2 absorption in sodium hydroxide and amine solutions an example of a fast gas-liquid reaction has been investigated in a single microstructured metallic mesh reactor, CRL reactor, PTFE single channel membrane reactor and the silicon nitride mesh reactor. CO2 absorption in sodium hydroxide solution was initially studied experimentally and theoretically in a metal microstructured mesh reactor. The differential mass balances to describe the concentration profiles of components in the three domains (gas/membrane/liquid), were solved with Comsol Multiphysics (modeling software for finite element analysis of partial differential equations). The model indicated that the carbon dioxide is consumed within few microns from the gas – liquid interface, and the dominant resistance for mass transfer is located in the mesh because it is wetted by the liquid reactant. In order to overcome the limitation of the extra resistance to the mass transfer in the metallic mesh, PTFE membranes were used in the single channel reactor, which are considered as hydrophobic to aqueous solutions of NaOH and amines. Monoethanolamine solution (MEA) absorbed more CO2 than diethanolamine (DEA) since the reaction rate constant for MEA is higher than DEA. 8 channel (PTFE) microreactor showed much higher CO2 removal efficiency than the metallic mesh microreactor. Furthermore the model indicated partial-wetting of the PTFE membrane when NaOH solution was used as an absorbent. In order to enhance mass transfer staggered herringbones were used on the floor of the liquid side of the single channel PTFE microreactor. No enhancement of mass transfer was observed with the use of staggered herringbones. A possible reason for that is that a limit for the fast second-order reaction is reached for enhancement and that the apparent reaction rate is independent from mass transfer for our case, or that the herringbones are far away from the reaction zone and cannot create the appropriate stirring for enhancement. In order to increase throughput, carbon dioxide absorption in sodium hydroxide solution was performed in the metallic mesh ‘scale-out’ reactor (with 4 meshes). CO2 removal efficiency for the ‘scale-out’ reactor was significantly lower than the single mesh reactor, which is probably due to breakthrough of liquid in the gas phase (stagnant liquid) or uneven flow distribution in each plate of the ‘scale-out’ reactor. Finally a silicon nitride mesh reactor developed by Bayer Technology Services and FluXXion was used for CO2 absorption in aqueous solutions of NaOH and DEA. The silicon nitride mesh reactor showed better performance than the PTFE single channel reactor, the metallic 8 channel reactor and the CRL mesh reactor when NaOH was used, due to the very thin membrane of 1 μm thickness, which makes the resistance to mass transfer very small.
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Otero, Gruer Fermin. "Multiscale numerical modelling of microstructured reinforced composites." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/392625.

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Most of the existing materials around us can be considered composite materials, since they are composed by several phases or components at certain spatial scale. The physical and chemical properties of composites, as occurs with structures composed by two or more materials, is defined by the response provided by their constituents. Therefore, a good characterization of the composite requires considering the performance of its components. In the last decades, several methods have been proposed with this approach to characterize composite materials, most of them based on multiscale techniques. Nowadays, multiscale homogenization analysis is a popular topic in the simulation of composite materials. This is because the complexity of new composites demands of advanced analysis techniques for their correct characterization, and thanks to the continuous increase of computational capacity. However, the computational cost when multiscale procedures are taken to the non-linear range and are applied to real-size structures is still excessively high. In this context, this work presents a comprehensive homogenization formulation for an efficient non-linear multiscale modeling of composite structures. The development of a composite multiscale constitutive model is addressed from two different homogenization approaches. The first one corresponds to a phenomenological homogenization procedure for the non-linear analysis of carbon nanotubes reinforced composites. The second one is a general two-scale homogenization procedure to analyze three-dimensional composite structures. Carbon nanotubes (CNTs) have been regarded as ideal reinforcements for high-performance composites. The formulation developed takes into account explicitly the performance of the interface between the matrix and the CNTs. The load is transferred to the nanotubes through the considered interface. The composite non-linear behavior results from the non-linearities of its constituents, and in case of interface damage, it also becomes non-linear the law defined to couple the interface with the CNTs. The formulation is validated studying the elastic response and non-linear behavior of several composites. In the context of multiscale homogenization, a first-order and an enhanced-first-order formulation is developed. The results obtained for laminate composites using the first-order formulation are compared with other microscopic formulations, showing that the homogenization method is an excellent alternative when microstructural effects must be taken into account. Then, a strategy to conduct non-linear multiscale analysis in an efficient way is proposed. The procedure conserves the dissipated energy through the scales and is mesh independent. The analysis of academic examples is used to show the capacity of the non-linear strategy. Finally, the simulation of an industrial composite component proves the performance and benefits of the non-linear homogenization procedure developed.
La obra de fábrica es un material de construcción tradicional que ha sido utilizado a lo largo de la historia y que sigue siendo utilizado hoy en día. La obra de fábrica constituye la principal técnica de construcción adoptada en estructuras históricas, y una comprensión profunda de su comportamiento es de vital importancia para la conservación de nuestro patrimonio cultural. A pesar de su amplio uso, la obra de fábrica ha sido utilizada frecuentemente adoptando un enfoque empírico, debido a un escaso conocimiento del comportamiento mecánico complejo de este tipo de material compuesto. Los métodos numéricos avanzados son herramientas atractivas para entender y predecir el comportamiento de la obra de fábrica hasta su fallo, permitiendo estimar la resistencia residual y la seguridad de las estructuras. Durante los últimos años, han sido propuestos diferentes modelos computacionales, basados bien en una micro-modelización completa de los constituyentes del material (ladrillos y juntas de mortero), o bien en macro-modelos fenomenológicos. A partir de estos dos enfoques, los métodos de homogenización computacional han emergido recientemente como una herramienta prometedora que puede combinar las ventajas de la micro- y macro-modelización. El problema se divide en dos pasos: la escala estructural se trata como un medio homogéneo equivalente, mientras el comportamiento complejo de la microestructura heterogénea se tiene en cuenta mediante la resolución de un problema micro-mecánico reconducible a una muestra representativa de la microestructura. El objetivo de esta investigación es el desarrollo de una técnica de homogenización computacional multi-escala para el análisis de estructuras de obra de fábrica sometidas a cargas horizontales cuasi-estáticas que actúan en el plano y fuera del plano. Se adopta la teoría clásica del medio continuo de Cauchy en ambas las escalas, utilizando así la homogeneización computacional del primer orden. Debido a la naturaleza frágil de los componentes de la obra de fábrica, el estudio contempla también el problema de la localización de la deformación en el marco del enfoque numérico de fisura distribuida. En este contexto, la presente investigación propone una extensión de la regularización basada en la energía de fractura para el problema de homogenización en dos escalas, permitiendo el uso de la homogenización computacional del primer orden en problemas que implican la localización de la deformación. El método se plantea en primer lugar para el caso continuo general, y a continuación se aplica al análisis de muros de corte cargados en su plano y hechos de fábrica de ladrillos con aparejo periódico. Posteriormente, el método se extiende al caso de estructuras tipo placa para el análisis de muros de obra de fábrica cargados fuera de su plano. Para este propósito, se desarrolla una nueva técnica de homogenización basada en la teoría de placas gruesas. En ambos los casos de carga en el plano y fuera del plano, la precisión del método propuesto se valida mediante la comparación con ensayos experimentales y análisis de micro-modelización. También se validan las propiedades de regularización. Los resultados obtenidos muestran cómo la homogeneización computacional pueda resultar una herramienta válida para una evaluación precisa de la respuesta estructural de las estructuras de obra de fábrica, teniendo en cuenta el comportamiento complejo de la micro-estructura.
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Books on the topic "Microstructured"

1

Jüri, Engelbrecht, and SpringerLink (Online service), eds. Microstructured Materials: Inverse Problems. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011.

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Large, Maryanne C. J., Leon Poladian, Geoff W. Barton, and Martijn A. van Eijkelenborg. Microstructured Polymer Optical Fibres. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-68617-2.

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Ganghoffer, J. F., and Franco Pastrone, eds. Mechanics of Microstructured Solids. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00911-2.

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Böhm, Helmut J., ed. Mechanics of Microstructured Materials. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6.

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Janno, Jaan, and Jüri Engelbrecht. Microstructured Materials: Inverse Problems. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21584-1.

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Kashid, Madhvanand N., Albert Renken, and Lioubov Kiwi-Minsker, eds. Microstructured Devices for Chemical Processing. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527685226.

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Ganghoffer, Jean-François, and Franco Pastrone, eds. Mechanics of Microstructured Solids 2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-05171-5.

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Davis, H. Ted. Statistical Thermodynamics and Differential Geometry of Microstructured Materials. New York, NY: Springer New York, 1993.

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Ted, Davis H., and Nitsche, Johannes C. C., 1925-, eds. Statistical thermodynamics and differential geometry of microstructured materials. New York: Springer-Verlag, 1993.

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Sumbatyan, Mezhlum A., ed. Wave Dynamics, Mechanics and Physics of Microstructured Metamaterials. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17470-5.

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Book chapters on the topic "Microstructured"

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Lægsgaard, Jesper, Anders Bjarklev, Tanya Monro, and Tanya Monro. "Microstructured optical fibers." In Handbook of Optoelectronics, 711–40. Second edition. | Boca Raton : Taylor & Francis, CRC Press,: CRC Press, 2017. http://dx.doi.org/10.1201/9781315157009-20.

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Böhm, Helmut J. "A Short Introduction to Continuum Micromechanics." In Mechanics of Microstructured Materials, 1–40. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_1.

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Böhm, Helmut J. "Modeling the Mechanical Behavior of Short Fiber Reinforced Composites." In Mechanics of Microstructured Materials, 41–56. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_2.

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Hattiangadi, A., and T. Siegmund. "Thermomechanical Cohesive Zone Models for the Analysis of Composite Failure under Thermal Gradients and Transients." In Mechanics of Microstructured Materials, 57–86. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_3.

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Llorca, Javier. "Deformation and Damage in Particle-Reinforced Composites: Experiments and Models." In Mechanics of Microstructured Materials, 87–124. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_4.

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McHugh, Peter E. "Introduction to Crystal Plasticity Theory." In Mechanics of Microstructured Materials, 125–71. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_5.

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Pyrz, Ryszard. "Microstructural Description of Composites, Statistical Methods." In Mechanics of Microstructured Materials, 173–233. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_6.

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Siegmund, T., R. Cipra, J. Liakus, B. Wang, M. LaForest, and A. Fatz. "Processing-Microstructure-Property Relationships in a Short Fiber Reinforced Carbon-Carbon Composite System." In Mechanics of Microstructured Materials, 235–58. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_7.

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Giessen, Erik. "Discrete Dislocation Plasticity." In Mechanics of Microstructured Materials, 259–82. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_8.

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Giessen, Erik. "Creep Rupture in Polycrystalline Materials." In Mechanics of Microstructured Materials, 283–306. Vienna: Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2776-6_9.

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Conference papers on the topic "Microstructured"

1

Maikowske, Stefan, Juergen J. Brandner, and Roland Dittmeyer. "Efficient Heat Transfer by Phase Transition in Microstructured Devices." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44116.

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Devices with microchannels or similar structures with dimensions in the range of a few 100 micrometers, so-called microstructured devices, have become a powerful tool in modern process engineering for transferring huge amounts of thermal energy. The high internal surface of these devices, caused by small characteristic channel dimensions, lead to very high specific heat transfer rates. Additional increase of these high heat transfer capabilities is enabled by taking advantage of the latent heat of evaporation. During fundamental research activities phase transition and accompanying phenomena in arrays out of straight microchannels as well as novel microstructures were investigated to obtain new and additional information about these processes. A novel microstructure which is based on a new innovative design away from straight channels is able to enhance evaporation. This design, based on semicircular and semi-elliptical microstructures, leads to mixing effects as well as flow acceleration by pressure release effects including increased heat transfer properties. This novel microstructure reaches highly enhanced evaporation performance compared to linear microchannels.
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Peyghambarian, N., A. Schulzgen, L. Li, V. Temyanko, P. Polynkin, A. Polynkin, D. Panasenko, M. Mansuripur, A. Mafi, and J. Moloney. "Microstructured fiber lasers." In 2005 IEEE LEOS Annual Meeting. IEEE, 2005. http://dx.doi.org/10.1109/leos.2005.1548063.

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"OWL - Microstructured fibers." In 2005 Optical Fiber Communications Conference Technical Digest. IEEE, 2005. http://dx.doi.org/10.1109/ofc.2005.192871.

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Mergo, Pawel, Jan Wójcik, Lidia Czyzewska, and Aleksander Walewski. "Microstructured polarizing fiber." In Congress on Optics and Optoelectronics, edited by Jan Rayss, Brian Culshaw, and Anna G. Mignani. SPIE, 2005. http://dx.doi.org/10.1117/12.626096.

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Treccani, Laura, and Kurosch Rezwan. "Microstructuring and Biofunctionalization of Alumina Surfaces to Enhance Abrasion Resistance and Suppress Bacterial Biofilm Growth." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72189.

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The design and fabrication of alumina microstructured surfaces that simultaneously present high mechanical and chemical features and do not suffer biofouling are here reported. An aerosol based patterning technique was employed to fabricate alumina microstructures directly on alumina surfaces with the aim to enhance wear and chemical resistance. Microstructured alumina surfaces were subsequently biofunctionalised with antibacterial biomolecules to inhibit bacterial adhesion. Lysozyme, an antibacterial enzyme commonly found in body secretions, was used as antibacterial agent and directly deposited onto microstructured alumina surfaces. Lysozyme-biofunctionalised microstructured alumina surfaces were tested at flow condition using abrasive particles and viable bacteria. The very preliminary results showed that alumina microstructures presented high resistance against mechanical abrasion and that bacterial biofilm formation could be suppressed. In particular alumina microstructures protected lysozyme molecules from desorption and loss of enzymatic activity. Such biofunctionalised microstructures present a promising system for fundamental research in the field of biomolecule adsorption on surfaces and maybe a feasible alternative e. g. to protect surfaces of water transport systems where abrasive particles and microorganisms are present.
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Argueta-Diaz, Victor, and Brianna Fitzpatrick. "PDMS-based microstructured biosensor." In Organic Photonic Materials and Devices XXI, edited by Christopher E. Tabor, François Kajzar, and Toshikuni Kaino. SPIE, 2019. http://dx.doi.org/10.1117/12.2506291.

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Troles, J., and L. Brilland. "Chalcogenide microstructured optical fibers." In 2012 Photonics Global Conference (PGC). IEEE, 2012. http://dx.doi.org/10.1109/pgc.2012.6458078.

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Argueta-Diaz, Victor, and Brianna Fitzpatrick. "PDMS Microstructured Interferometric Sensor." In Frontiers in Optics. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/fio.2019.jtu3a.6.

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Fülöp, József A., Gábor Almási, Gergő Krizsán, Nelson M. Mbithi, Mátyás I. Mechler, Priyo S. Nugraha, László Pálfalvi, et al. "Microstructured Intense THz Sources." In Terahertz Science and Applications. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/tsa.2019.tth4d.4.

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Troles, Johann, and Laurent Brilland. "Microstructured chalcogenide glass fibers." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/assl.2015.am4a.6.

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Reports on the topic "Microstructured"

1

Bellinger, Steven L. Wide-Bandgap Microstructured Semiconductor Neutron Detector Final Technical Report. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1423867.

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Miller, Gregory H., and Gregory Forest. Modeling and Algorithmic Approaches to Constitutively-Complex, Microstructured Fluids. Office of Scientific and Technical Information (OSTI), May 2014. http://dx.doi.org/10.2172/1150221.

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Stritzinger, Laurel Elaine Winter, Ross David Mcdonald, Neil Harrison, P. J. W. Moll, A. Shekhter, B. J. Ramshaw, and Eric Dietzgen Bauer. Electric Field Effects on the Hidden Order of Microstructured URu2Si2. Office of Scientific and Technical Information (OSTI), March 2017. http://dx.doi.org/10.2172/1351216.

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Asenath-Smith, Emily, Ross Lieblappen, Susan Taylor, Reed Winter, Terry Melendy, Robert Moser, and Robert Haehnel. Observation of crack arrest in ice by high aspect ratio particles during uniaxial compression. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43145.

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In nature, ice frequently contains dissolved solutes or entrapped particles, which modify the microstructure and mechanical properties of ice. Seeking to understand the effect of particle shape and geometry on the mechanical properties of ice, we performed experiments on ice containing 15 wt% silica spheres or rods. Unique to this work was the use of 3-D microstructural imaging in a -10ºC cold room during compressive loading of the sample. The silica particles were present in the ice microstructure as randomly dispersed aggregates within grains and at grain boundaries. While cracks originated in particle-free regions in both sphere- and rod-containing samples, the propagation of cracks was quite different in each type of sample. Cracks propagated uninhibited through aggregates of spherical particles but were observed to arrest at and propagate around aggregates of rods. These results imply that spherical particles do not inhibit grain boundary sliding or increase viscous drag. On the other hand, silica rods were found to span grains, thereby pinning together the microstructure of ice during loading. These results provide insights into mechanisms that can be leveraged to strengthen ice.
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Allen, Jeffrey, Robert Moser, Zackery McClelland, Md Mohaiminul Islam, and Ling Liu. Phase-field modeling of nonequilibrium solidification processes in additive manufacturing. Engineer Research and Development Center (U.S.), December 2021. http://dx.doi.org/10.21079/11681/42605.

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This project models dendrite growth during nonequilibrium solidification of binary alloys using the phase-field method (PFM). Understanding the dendrite formation processes is important because the microstructural features directly influence mechanical properties of the produced parts. An improved understanding of dendrite formation may inform design protocols to achieve optimized process parameters for controlled microstructures and enhanced properties of materials. To this end, this work implements a phase-field model to simulate directional solidification of binary alloys. For applications involving strong nonequilibrium effects, a modified antitrapping current model is incorporated to help eject solute into the liquid phase based on experimentally calibrated, velocity-dependent partitioning coefficient. Investigated allow systems include SCN, Si-As, and Ni-Nb. The SCN alloy is chosen to verify the computational method, and the other two are selected for a parametric study due to their different diffusion properties. The modified antitrapping current model is compared with the classical model in terms of predicted dendrite profiles, tip undercooling, and tip velocity. Solidification parameters—the cooling rate and the strength of anisotropy—are studied to reveal their influences on dendrite growth. Computational results demonstrate effectiveness of the PFM and the modified antitrapping current model in simulating rapid solidification with strong nonequilibrium at the interface.
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Moore, A. S., C. A. Thomas, and T. M. Reese. Microstructure Filled Hohlraums. Office of Scientific and Technical Information (OSTI), February 2017. http://dx.doi.org/10.2172/1345335.

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Aker, P. M. Optical Imaging in Microstructures. Office of Scientific and Technical Information (OSTI), April 2001. http://dx.doi.org/10.2172/833829.

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Owen, Steven, Corey Ernst, Judith Brown, Hojun Lim, Kevin Long, Nathan Moore, Corbett Battaile, and Theron Rodgers. Mesh Generation for Microstructures. Office of Scientific and Technical Information (OSTI), July 2019. http://dx.doi.org/10.2172/1762957.

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9

Gregg, Michael C., and Jack B. Miller. Modular Microstructure Profiler (MMP). Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada605602.

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Olson, Gregory B. Dynamic Microstructure Design Consortium. Fort Belvoir, VA: Defense Technical Information Center, March 2011. http://dx.doi.org/10.21236/ada544619.

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