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Literatura académica sobre el tema "Microstructured surface"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de abril de 2022

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Artículos de revistas sobre el tema "Microstructured surface"

Clasen, Antje y Antonia B. Kesel. "Microstructural Surface Properties of Drifting Seeds—A Model for Non-Toxic Antifouling Solutions". Biomimetics 4, n.º 2 (13 de mayo de 2019): 37. http://dx.doi.org/10.3390/biomimetics4020037.

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A major challenge in the shipping and marine industry is the biofouling on under water surfaces. So far, biocides have been the main remedy for the prevention of the adhesion of microorganisms that is also influenced by surface topography. In recent years, research projects have explored microstructured surfaces as a non-toxic antifouling strategy. In this study, physical factors of surfaces of seeds of 43 plant species were analyzed with regards to their antifouling effects. After exposure to cold water of the North Sea during the swarming periods of the barnacles larvae, the surface microstructures of seeds without fouling of barnacles were identified and compared with each other, using a scanning electron microscope (SEM). In order to validate the findings, selected microstructured surface structure properties were transferred to technical surfaces with a 2-component silicon system and subjected to the same conditions. The results of the analyses confirmed that drifting seeds with specific microstructural surface structure properties promote biofouling defense of epibionts. These results serve as a starting point for the development of non-toxic antifouling agents based on the interaction of microstructures and geometric shapes.

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Guo, Bing, Qing Liang Zhao, Yan Hou, Cheng Ge y Xin Yu. "Ultrasonic Vibration Assisted Grinding of Microstructures on Binderless Tungsten Carbide (WC)". Key Engineering Materials 625 (agosto de 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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Sun, Jiazhen, Chenghu Yun, Bo Cui, Pingping Li, Guangping Liu, Xin Wang y Fuqiang Chu. "A Facile Approach for Fabricating Microstructured Surface Based on Etched Template by Inkjet Printing Technology". Polymers 10, n.º 11 (31 de octubre de 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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Baum, Martina J., Lars Heepe, Elena Fadeeva y Stanislav N. Gorb. "Dry friction of microstructured polymer surfaces inspired by snake skin". Beilstein Journal of Nanotechnology 5 (21 de julio de 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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Nonomura, Yoshimune, Shigeyuki Komura y Kaoru Tsujii. "Surface-Active Particles with Microstructured Surfaces". Langmuir 21, n.º 21 (octubre de 2005): 9409–11. http://dx.doi.org/10.1021/la051816m.

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Cai, Yukui, Wenlong Chang, Xichun Luo y Yi Qin. "Superhydrophobicity of microstructured surfaces on zirconia by nanosecond pulsed laser". Journal of Micromanufacturing 2, n.º 1 (9 de octubre de 2018): 5–14. http://dx.doi.org/10.1177/2516598418799933.

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This article presents a systematic approach to improve the hydrophobicity of microstructured surfaces. It includes a contact angle prediction model for microstructures obtained by nanosecond pulsed laser. Combining with the theoretical constraints for stable Cassie–Baxter state, this approach can be used to optimize microstructures dimensions for maximizing surface hydrophobicity. Laser machining experiments were conducted to evaluate the prediction model. It shows that the proposed systematic approach can accurately predict the contact angle and obtain microstructures dimensions for maximizing surface hydrophobicity. The results also indicate that the contact angle increases with the decrease of pitch of the microstructures. Superhydrophobicity with maximum contact angle of 155.7° is obtained, for the first time, on a microstructured surface (P030) of zirconia with a pitch of 30 µm machined under a laser power at 8W.

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Zhang, Dawei, Haiyang Li, Xiaoli Chen, Hongchang Qian y 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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ZHENG, Lijun. "Superhydrophobicity from microstructured surface". Chinese Science Bulletin 49, n.º 17 (2004): 1779. http://dx.doi.org/10.1360/04wb0047.

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Zheng, Lijun, Xuedong Wu, Zeng Lou y Dan Wu. "Superhydrophobicity from microstructured surface". Chinese Science Bulletin 49, n.º 17 (septiembre de 2004): 1779–87. http://dx.doi.org/10.1007/bf03183400.

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Lazauskas, Algirdas, Viktoras Grigaliūnas y Dalius Jucius. "Recovery Behavior of Microstructured Thiol-Ene Shape-Memory Film". Coatings 9, n.º 4 (20 de abril de 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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Tesis sobre el tema "Microstructured surface"

Neumann, Stephan, Georg Jacobs, Achim Feldermann y Felix Straßburger. "Reducing Friction and Leakage by Means of Microstructured Sealing Surfaces – Example Mechanical Face Seal". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199867.

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By defined structuring of sliding surfaces at dynamic contact seals friction and leakage can be reduced. Compared to macro-structures, micro-structures have the advantage of a quasi-homogeneous influence on the fluid behavior in the sealing gap. The development of suitable microstructures based on prototypes, whose properties are studied on the test bench, is very expensive and time-consuming due to the challenging manufacturing process and measuring technologies, which are necessary to investigate the complex rheological behavior within the sealing gap. A simulation-based development of microstructured sealing surfaces offers a cost- and time-saving alternative. This paper presents a method for simulative design and optimization of microstructured sealing surfaces at the example of a microstructured mechanical face seal.

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Yang, Zhugen. "3D-Microstructured Protein Chip for Cancer Diagnosis". Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00780192.

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Protein microarrays are becoming powerful tools to screen and identify tumor markers for cancer diagnosis, because of the multiplex detection and minute volume of sample requirement. Due to the diversity and variation in different cancers, no single tumor marker is sensitive and specific enough to meet strict diagnostic criteria. Therefore, a combination of tumor markers is required to increase sensitivity and to establish distinct patterns to increase specificity. To obtain reliable tests, the development of reproducible surface chemistry and immobilization procedure are crucial steps in the elaboration of efficient protein microarrays. In this thesis, 3D micro-structured glass slides were functionalized with various surface chemistries like silane monolayer (amino, epoxy and carboxy), and polymer layers of Jeff amine, chitosan, carboxymethyl dextran (CMD), maleic anhydride-alt-methyl vinyl ether copolymer (MAMVE) for physical adsorption or covalent binding with proteins. Surface characterizations, such as X-ray photoelectron spectroscopy (XPS) and Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), confirmed the monolayer/polymer grafting on the glass slides. Colorimetric assay for determining amine density of three aminated surfaces demonstrated that APDMES had more grafting density than Jeffamine and chitosan. Contact angle measurements show that polymer surfaces were more hydrophilic than monolayer surfaces due to the increasing dosages of polar functional groups. Moreover, the parameters such as additives and pH of spotting buffer, probe concentration, blocking procedures etc, were optimized for tumor marker detection. Under the optimized conditions, antibody microarrays were validated with purified tumor antigens. The best analytical performances obtained for each tumor antigen tested were strongly dependent on functionalized surfaces, e.g. MAMVE exhibited best analytical performances for CEA andHsp60 while NHS leads to best results for PDI and CA19-9. Besides, the implemented antibody microarrays were applied to tumor marker detection from colorectal cancer sera. This evaluation shows the interest to combine several tumor markers on the same surface and the combination of tumor markers on their specific surface lead to remarkably increase the positive responses of tested cancer sera (even up to 100 %). A second type of microarrays (tumor-associated antigens - TAA microarrays) was designed to discriminate breast cancer patients from healthy donors through the detection of tumor autoantibodies. This study included a cohort of 29 breast cancer patients' and 28 healthy donors' sera. A panel of fiveTAAs (Hsp60, p53, Her2, NY-ESO-1 and Hsp70) immobilized on their respective optimized surface chemistry allowed to specifically detect over 82% of breast cancer patients.

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Zhang, Bo. "Magnetic fields near microstructured surfaces : application to atom chips". Phd thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2009/2898/.

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Microfabricated solid-state surfaces, also called atom chip', have become a well-established technique to trap and manipulate atoms. This has simplified applications in atom interferometry, quantum information processing, and studies of many-body systems. Magnetic trapping potentials with arbitrary geommetries are generated with atom chip by miniaturized current-carrying conductors integrated on a solid substrate. Atoms can be trapped and cooled to microKelvin and even nanoKelvin temperatures in such microchip trap. However, cold atoms can be significantly perturbed by the chip surface, typically held at room temperature. The magnetic field fluctuations generated by thermal currents in the chip elements may induce spin flips of atoms and result in loss, heating and decoherence. In this thesis, we extend previous work on spin flip rates induced by magnetic noise and consider the more complex geometries that are typically encountered in atom chips: layered structures and metallic wires of finite cross-section. We also discuss a few aspects of atom chips traps built with superconducting structures that have been suggested as a means to suppress magnetic field fluctuations. The thesis describes calculations of spin flip rates based on magnetic Green functions that are computed analytically and numerically. For a chip with a top metallic layer, the magnetic noise depends essentially on the thickness of that layer, as long as the layers below have a much smaller conductivity. Based on this result, scaling laws for loss rates above a thin metallic layer are derived. A good agreement with experiments is obtained in the regime where the atom-surface distance is comparable to the skin depth of metal. Since in the experiments, metallic layers are always etched to separate wires carrying different currents, the impact of the finite lateral wire size on the magnetic noise has been taken into account. The local spectrum of the magnetic field near a metallic microstructure has been investigated numerically with the help of boundary integral equations. The magnetic noise significantly depends on polarizations above flat wires with finite lateral width, in stark contrast to an infinitely wide wire. Correlations between multiple wires are also taken into account. In the last part, superconducting atom chips are considered. Magnetic traps generated by superconducting wires in the Meissner state and the mixed state are studied analytically by a conformal mapping method and also numerically. The properties of the traps created by superconducting wires are investigated and compared to normal conducting wires: they behave qualitatively quite similar and open a route to further trap miniaturization, due to the advantage of low magnetic noise. We discuss critical currents and fields for several geometries.
Mikrotechnologische Oberflächen, sogenannte Atomchips, sind eine etablierte Methode zum Speichern und Manipulieren von Atomen geworden. Das hat Anwendungen in der Atom-Interferometrie, Quanteninformationsverarbeitung und Vielteilchensystemen vereinfacht. Magnetische Fallenpotentiale mit beliebigen Geometrien werden durch Atomchips mit miniaturisierten stromführenden Leiterbahnen auf einer Festkörperunterlage realisiert. Atome können bei Temperaturen im $mu$ K oder sogar nK-Bereich in einer solchen Falle gespeichert und gekühlt werden. Allerdings können kalte Atome signifikant durch die Chip-Oberfläche gestört werden, die sich typischerweise auf Raumtemperatur befindet. Die durch thermische Ströme im Chip erzeugten magnetischen Feldfluktuationen können Spin-Flips der Atome induzieren und Verlust, Erwärmung und Dekohärenz zur Folge haben. In dieser Dissertation erweitern wir frühere Arbeiten über durch magnetisches Rauschen induzierte Spin-Flip-Ratenund betrachten kompliziertere Geometrien, wie sie typischerweise auf einem Atom-Chip anzutreffen sind: Geschichtete Strukturen und metallische Leitungen mit endlichem Querschnitt. Wir diskutieren auch einige Aspekte von Aomchips aus Supraleitenden Strukturen die als Mittel zur Unterdrückung magnetischer Feldfluktuationen vorgeschlagen wurden. Die Arbeit beschreibt analytische und numerische Rechnungen von Spin-Flip Raten auf Grundlage magnetischer Greensfunktionen. Für einen Chip mit einem metallischen Top-Layer hängt das magnetische Rauschen hauptsächlich von der Dicke des Layers ab, solange die unteren Layer eine deutlich kleinere Leitfähigkeit haben. Auf Grundlage dieses Ergebnisses werden Skalengesetze für Verlustraten über einem dünnen metallischen Leiter hergeleitet. Eine gute Übereinstimmung mit Experimenten wird in dem Bereich erreicht, wo der Abstand zwischen Atom und Oberfläche in der Größenordnung der Eindringtiefe des Metalls ist. Da in Experimenten metallische Layer immer geätzt werden, um verschiedene stromleitende Bahnen vonenander zu trennen, wurde der Einfluß eines endlichen Querschnittsauf das magnetische Rauschen berücksichtigt. Das lokale Spektrum des magnetischen Feldes in der Nähe einer metallischen Mikrostruktur wurde mit Hilfe von Randintegralen numerisch untersucht. Das magnetische Rauschen hängt signifikant von der Polarisierung über flachen Leiterbahnen mit endlichem Querschnitt ab, im Unterschied zu einem unendlich breiten Leiter. Es wurden auch Korrelationen zwischen mehreren Leitern berücksichtigt. Im letzten Teil werden supraleitende Atomchips betrachtet. Magnetische Fallen, die von supraleitenden Bahnen im Meissner Zustand und im gemischten Zustand sind werden analytisch durch die Methode der konformen Abbildung und numerisch untersucht. Die Eigenschaften der durch supraleitende Bahnen erzeugten Fallen werden erforscht und mit normal leitenden verglichen: Sie verhalten sich qualitativ sehr ähnlich und öffnen einen Weg zur weiteren Miniaturisierung von Fallen, wegen dem Vorteil von geringem magnetischem Rauschen. Wir diskutieren kritische Ströme und Felder für einige Geometrien.

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Bostanci, Huseyin. "HIGH HEAT FLUX SPRAY COOLING WITH AMMONIA ON ENHANCED SURFACES". Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3209.

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Many critical applications today, in electronics, optics and aerospace fields, among others, demand advanced thermal management solutions for the acquisition of high heat loads they generate in order to operate reliably and efficiently. Current competing technologies for this challenging task include several single and two phase cooling options. When these cooling schemes are compared based on the high heat flux removal (100-1000 W/cm2) and isothermal operation (within several oC across the cooled device) aspects, as well as system mass, volume and power consumption, spray cooling appears to be the best choice. The current study focused on high heat flux spray cooling with ammonia on enhanced surfaces. Compared to some other commonly used coolants, ammonia possesses important advantages such as low saturation temperature, and high heat absorbing capability. Moreover, enhanced surfaces offer potential to greatly improve heat transfer performance. The main objectives of the study were to investigate the effect of surface enhancement on spray cooling performance, and contribute to the current understanding of spray cooling heat transfer mechanisms. These objectives were pursued through a two stage experimental study. While the first stage investigated enhanced surfaces for the highest heat transfer coefficient at heat fluxes of up to 500 W/cm2, the second stage investigated the optimized enhanced surfaces for critical heat flux (CHF). Surface modification techniques were utilized to obtain micro scale indentations and protrusions, and macro (mm) scale pyramidal, triangular, rectangular, and square pin fins. A third group, multi-scale structured surfaces, combined macro and micro scale structures. Experimental results indicated that micro- and macrostructured surfaces can provide heat transfer coefficients of up to 534,000 and 426,000 W/m2oC at 500 W/cm2, respectively. Multi-scale structured surfaces offered even a better performance, with heat transfer coefficients of up to 772,000 W/m2oC at 500 W/cm2, corresponding to a 161% increase over the reference smooth surface. In CHF tests, the optimized multi-scale structured surface helped increase maximum heat flux limit by 18%, to 910 W/cm2 at nominal liquid flow rate. During the additional CHF testing at higher flow rates, most heaters experienced failures before reaching CHF at heat fluxes above 950 W/cm2. However, the effect of flow rate was still characterized, suggesting that enhanced surfaces can achieve CHF values of up to 1,100 W/cm2 with 67% spray cooling efficiency. The results also helped shed some light on the current understanding of the spray cooling heat transfer mechanisms. Data clearly proved that in addition to fairly well established mechanisms of forced convection in the single phase regime, and free surface evaporation and boiling through secondary nucleation in the two phase regime, enhanced surfaces can substantially improve boiling through surface nucleation, which can also be supported by the concept of three phase contact lines, the regions where solid, liquid and vapor phases meet. Furthermore, enhanced surfaces are capable of retaining more liquid compared to a smooth surface, and efficiently spread the liquid film via capillary force within the structures. This unique advantage delays the occurrence of dry patches at high heat fluxes, and leads to higher CHF.
Ph.D.
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering PhD

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Wunderlich, Philipp Verfasser], Ulrich [Akademischer Betreuer] [Simon y Dirk Uwe [Akademischer Betreuer] Sauer. "Surface-modified microstructured carbon electrodes for lithium-oxygen batteries / Philipp Wunderlich ; Ulrich Simon, Dirk Uwe Sauer". Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1220082635/34.

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Widyaya, Vania Tanda [Verfasser] y Karen [Akademischer Betreuer] Lienkamp. "Three-dimensional, bioactive microstructured surface-attached polymer network by microcontact printing - simultaneous antimicrobial activity, protein repellency, and cell compatibility". Freiburg : Universität, 2019. http://d-nb.info/1205663304/34.

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Yata, Vishnu Vardhan Reddy. "Investigation of Spray Cooling Schemes for Dynamic Thermal Management". Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984153/.

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This study aims to investigate variable flow and intermittent flow spray cooling characteristics for efficiency improvement in active two-phase thermal management systems. Variable flow spray cooling scheme requires control of pump input voltage (or speed), while intermittent flow spray cooling scheme requires control of solenoid valve duty cycle and frequency. Several testing scenarios representing dynamic heat load conditions are implemented to characterize the overall performance of variable flow and intermittent flow spray cooling cases in comparison with the reference, steady flow spray cooling case with constant flowrate, continuous spray cooling. Tests are conducted on a small-scale, closed loop spray cooling system featuring a pressure atomized spray nozzle. HFE-7100 dielectric liquid is selected as the working fluid. Two types of test samples are prepared on 10 mm x 10 mm x 2 mm copper substrates with matching size thick film resistors attached onto the opposite side, to generate heat and simulate high heat flux electronic devices. The test samples include: (i) plain, smooth surface, and (ii) microporous surface featuring 100 μm thick copper-based coating prepared by dual stage electroplating technique. Experimental conditions involve HFE-7100 at atmospheric pressure and 30°C and ~10°C subcooling. Steady flow spray cooling tests are conducted at flow rates of 2 - 5 ml/cm².s, by controlling the heat flux in increasing steps, and recording the corresponding steady-state temperatures to obtain cooling curves in the form of surface superheat vs. heat flux. Variable flow and intermittent flow spray cooling tests are done at selected flowrate and subcooling conditions to investigate the effects of dynamic flow conditions on maintaining the target surface temperatures defined based on reference steady flow spray cooling performance.

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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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Rjiba, Narjes. "Fibre de coton : microstructures et propriétés de surface". Mulhouse, 2007. http://www.theses.fr/2007MULH0873.

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Le principal objectif de ce travail était de caractériser d'un point de vue physico-chimique la surface de la fibre de coton. Une fibre brute et une fibre extraite à l'éthanol ont été analysées. Cette caractérisation a été principalement menée par chromatographie gazeuse inverse (IGC), permettant de déterminer l'énergie de surface de ces fibres en fonction de la température ainsi que leur morphologie de surface à une échelle moléculaire, avant et après traitement. Il a été montré que l'énergie de surface de la fibre brute dépend fortement de la présence de cires et de pectines qui recouvrent un tel type de fibre. En particulier, la fusion des cires en surface des fibres est nettement mise en évidence dans une gamme de températures comprises entre 50 et 90°C. La nano-morphologie de la surface de la fibre de coton est aussi très affectée par la présence des cires : une extraction à l'éthanol conduisant à une surface plus homogène d'un point de vue topographique. Dans la de Kième partie de ce travail, pour confirmer les résultats obtenus par IGC, la fibre de coton a été caractérisée par d'autres techniques microscopiques (microscopies électronique et à force atomique) et spectroscopiques (spectroscopie de photoélectrons, spectroscopies vibrationnelles,. . . )
The aim of this work was to characterize the surface of the cotton fibre from a physical and chemical point of view. Raw and ethanol extracted fibres were particularly analysed. This characterization was mainly performed by means of inverse gas chromatography (IGC), which allowed us to determine the surface energy of the fibres as a function of temperature as well as their surface morphology at a molecular scale, before and alter treatment. It was shown that the thermodynamic surface energy of the raw cotton fibre strongly depends on the presence of waxes and pectins which usually cover such a type of fibre. In particular, the melting of waxes on the fibre surface, in a range of temperatures from 50 to 90°C, is clearly pointed out. The nano-morphological aspects of the cotton fibre surface are also greatly affected by the presence of waxes: ethanol extraction leading to a more homogeneous surface from a topographical point of view. To confirm the results obtained by IGC, the characterization of cotton fibres was completed, in the second part of this work, by means of other microscopical (electronic and atomic force microscopies ) and spectroscopie (X-ray photoelectron spectroscopy, vibrational spectroscopies,. . . ) techniques

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Agarwal, Vivek. "Microstructure studies in surfactant systems /". View online ; access limited to URI, 2004. http://wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3160026.

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Más fuentes

Libros sobre el tema "Microstructured surface"

Tsukruk, Vladimir V. y Kathryn J. Wahl, eds. Microstructure and Microtribology of Polymer Surfaces. Washington, DC: American Chemical Society, 1999. http://dx.doi.org/10.1021/bk-2000-0741.

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Li, J. M. Image-Based Fractal Description of Microstructures. Boston, MA: Springer US, 2003.

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Walgraef, D. Patterns, Defects and Microstructures in Nonequilibrium Systems: Applications in Materials Science. Dordrecht: Springer Netherlands, 1987.

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NATO Advanced Research Workshop on Spectroscopy of Semiconductor Microstructures (1989 Venice, Italy). Spectroscopy of semiconductor microstructures. New York: Plenum Press, 1989.

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Nastasi, Michael. Mechanical Properties and Deformation Behavior of Materials Having Ultra-Fine Microstructures. Dordrecht: Springer Netherlands, 1993.

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Torquato, Salvatore. Random Heterogeneous Materials: Microstructure and Macroscopic Properties. New York, NY: Springer New York, 2002.

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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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Mason, Stephen. The microstructure, mechanical properties and surface transformations of a syalon ceramic. [s.l.]: typescript, 1988.

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Polymer interfaces: Structure and strength. Munich: Hanser Publishers, 1994.

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Jennings, Hamlin. The Modelling of Microstructure and its Potential for Studying Transport Properties and Durability. Dordrecht: Springer Netherlands, 1996.

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Capítulos de libros sobre el tema "Microstructured surface"

Kong, Lingbao, Zhongchen Cao y Laiting Ho. "Bonnet Polishing of Microstructured Surface". En Micro/Nano Technologies, 371–420. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0098-1_11.

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Kong, Lingbao, Zhongchen Cao y Laiting Ho. "Bonnet Polishing of Microstructured Surface". En Micro/Nano Technologies, 1–50. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6588-0_11-1.

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Xie, Jin. "Precision Grinding for Functional Microstructured Surface". En Micro/Nano Technologies, 301–31. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0098-1_9.

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Xie, J. "Precision Grinding for Functional Microstructured Surface". En Micro/Nano Technologies, 1–33. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6588-0_9-1.

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Xie, J. "Precision Grinding for Functional Microstructured Surface". En Micro/Nano Technologies, 1–33. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6588-0_9-2.

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Xie, J. "Precision Grinding for Functional Microstructured Surface". En Micro/Nano Technologies, 1–31. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6588-0_9-3.

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Adolph, Torsten, Willi Schönauer, Roman Koch y Gunter Knoll. "Capability of FDEM for Journal Bearings with Microstructured Surface". En High Performance Computing in Science and Engineering, Garching/Munich 2009, 175–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13872-0_15.

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Sharma, D. K. y S. M. Tripathi. "Theoretical Implications for Surface Plasmon Resonance Based on Microstructured Optical Fiber". En Springer Proceedings in Physics, 43–52. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6467-3_6.

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Sharma, Dinesh Kumar y Saurabh Mani Tripathi. "Surface Plasmon Resonance Based Microstructured Optical Fiber Sensor in IR Regime Using ITO Layer". En Springer Proceedings in Physics, 727–30. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9259-1_168.

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Actas de conferencias sobre el tema "Microstructured surface"

Fu, Yangyang, Huihui Wang, Bocong Zheng, Peng Zhang, Qi Hua Fan, Xinxin Wang y John P. Verboncoeur. "Microplasma Formation Around a Microstructured Surface". En 2021 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2021. http://dx.doi.org/10.1109/icops36761.2021.9588403.

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Nagayama, Gyoko, Ryuji Ando y Takaharu Tsuruta. "Microscopic Wetting at Microstructured Surface of Porous Silicon". En ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18452.

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Surface wettability is an important factor for micro/nanoscale thermal fluidic systems and it has attracted much interest for both fundamental research and practical applications. As one of the most attractive materials with controllable wettability, porous silicon is easy to be produced by the electrochemical etching. In this study, the effects of the microstructures of porous silicon on the wetting behavior of a pure water droplet were investigated experimentally. The solid-liquid contacting surface of the porous silicon substrate was prepared by varying both the geometrical microstructure and the chemical composition. The anodic etching was applied to the n type silicon substrate of orientation (100) and the geometrical microstructures of porous silicon were controlled by varying the fabrication conditions of the electrochemical etching. The pores of diameter ranging from 1–6 micrometers and the porosity up to 0.8 were obtained. Also, the surface chemical composition was controlled by coating the SiO2 layer or the CYTOP fluoropolymer layer directly on the porous silicon surface. The contact angle of the pure water droplet was measured at the prepared porous silicon surface in a room with constant temperature and humidity. The effects of the microstructures on the contact angle were discussed and the results were compared to both the classical theoretical models and a modified model based on the molecular dynamics simulations.

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Webb, Rebecca N., Julie A. Horvath y Allen G. Boartfield. "Enhanced Heat Collection Element Performance Through Surface Geometry". En ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54454.

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Concentrated solar power produces electricity by using a mirror to focus sunlight on a fluid filled tube known as a heat collection element. The fluid inside the element is then used as a heat source for steam generation in a conventional steam turbine power plant. It is possible that adding microstructures to the surface of the conventionally smooth heat collection element could improve system efficiency, motivating the need for an improved understanding of the radiation characteristics of a microstructured surface. The goal of this work was to experimentally determine the impact of different microscale geometries on net radiative heat gain when angle of incidence was varied. Five test pieces, one with a smooth surface and four with microstructured surfaces were compared experimentally for a given infrared energy input and flow rate and five different angles of incidence. Over the entire range of angles the microstructured test pieces absorbed more energy than the smooth test piece.

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Maikowske, Stefan, Juergen J. Brandner y Roland Dittmeyer. "Efficient Heat Transfer by Phase Transition in Microstructured Devices". En 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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Liu, Tingyi Leo y Chang-Jin C. J. Kim. "Microstructured SiO2 surface repellant to liquids without coating". En 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII). IEEE, 2013. http://dx.doi.org/10.1109/transducers.2013.6627091.

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Brückner, Frank, Tina Clausnitzer, Oliver Burmeister, Daniel Friedrich, Ernst-Bernhard Kley, Karsten Danzmann, Andreas Tünnermann y Roman Schnabel. "100% reflectivity from a monolithic dielectric microstructured surface". En MOEMS-MEMS 2008 Micro and Nanofabrication, editado por Thomas J. Suleski, Winston V. Schoenfeld y Jian J. Wang. SPIE, 2008. http://dx.doi.org/10.1117/12.767775.

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Bitzer, M., J. Zosel y M. Gebhardt. "Replication and surface enhancement of microstructured optical components". En Optical Systems Design 2005. SPIE, 2005. http://dx.doi.org/10.1117/12.625172.

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Aili, Abulimiti, Qiaoyu Ge y TieJun Zhang. "Condensation of Low-Surface-Tension Fluids on Microstructured Surfaces at Low Temperature". En ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71675.

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Filmwise condensation of a low surface tension fluid (i.e. refrigerant) on microstructured aluminum surfaces is studied to investigate the effect of the structures on condensation heat transfer at low temperature. The hypothesis is that the structures may cause thinning of the condensate film at micro-scales, thus resulting in an enhancement of condensation heat transfer. However, the structures may also decrease the mobility of the condensate near the surface due to increased friction, thus potentially leading to performance deterioration. The aim of this work is to investigate which of the two counteracting mechanisms dominate during filmwise condensation. Condensation experiments are carried out in a low-temperature vacuum chamber. Compared with the Nusselt model of condensation, the microstructured surfaces, either coated or uncoated, show similar performance, with potentially slight enhancement at low subcooling degree and slight deterioration at high subcooling degree. When the microstructured and silane-coated surface is infused with a non-volatile and very low-surface-tension lubricant oil, the lubricant is displaced by the condensate and there is almost no change in the condensation performance. Our results show that, unlike the case of dropwise condensation of high-surface tension fluids, microstructured and coated surfaces with/without infusing oil is not exciting to enhanced filmwise condensation of low-surface-tension fluids.

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Tchahame, Joël Cabrel, Jean-Charles Beugnot, Kien Phan Huy, Vincent Laude, Alexandre Kudlinski y Thibaut Sylvestre. "Observation of surface Brillouin scattering in microstructured optical fibers". En Frontiers in Optics. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/fio.2016.ftu5i.2.

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Kagerer, Bernd, Rainer Brodmann, Juergen Valentin, Jan Filzek y Uwe Popp. "3D-confocal microscopy for surface analysis of microstructured materials". En International Symposium on Optical Science and Technology, editado por Stephen F. Sagan, Gerald F. Marshall y Leo Beiser. SPIE, 2002. http://dx.doi.org/10.1117/12.469201.

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Informes sobre el tema "Microstructured surface"

Taube, M., W. T. Chase, A. J. Davenport y A. P. Jardine. Investigation and replication of the surface microstructure of early Chinese black bronze mirrors. Office of Scientific and Technical Information (OSTI), julio de 1994. http://dx.doi.org/10.2172/10161385.

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Kruger, Jerome. Role of Surface and Thin Film Composition and Microstructure and Properties of Materials. Fort Belvoir, VA: Defense Technical Information Center, junio de 1988. http://dx.doi.org/10.21236/ada197995.

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Freibert, Franz Joseph y Alison Leslie Pugmire. Microstructural Changes with Mechanically Induced Surface δ → α’ Transformation: Concerns about Ga Stabilized delta-Pu Coupon Surface Preparations. Office of Scientific and Technical Information (OSTI), junio de 2017. http://dx.doi.org/10.2172/1361470.

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Smugeresky, J. E., D. M. Keicher, J. A. Romero, M. L. Griffith y L. D. Harwell. Laser engineered net shaping (LENS{trademark}) process: Optimization of surface finish and microstructural properties. Office of Scientific and Technical Information (OSTI), noviembre de 1997. http://dx.doi.org/10.2172/554828.

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Linch, Heidi Sue. Aging effects on the microstructure, surface characteristics and wettability of Cu pretinned with Sn-Pb solders. Office of Scientific and Technical Information (OSTI), noviembre de 1993. http://dx.doi.org/10.2172/10125229.

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Hwa, Yoon, Christopher Kumai, Nancy Yang, Joshua Yee y Thomas Devine. Effect of Microstructural Bands on the Localized Corrosion of Laser Surface-melted 316L Stainless Steel. Office of Scientific and Technical Information (OSTI), septiembre de 2021. http://dx.doi.org/10.2172/1825629.

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Bieler, T. R., D. Baars, K. T. Hartwig, C. Compton y T. L. Grimm. Relationships between deformation and microstructure evolution and minimizing surface roughness after BCP processing in RRR Nb cavitites. Office of Scientific and Technical Information (OSTI), mayo de 2009. http://dx.doi.org/10.2172/953204.

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Gourley, P. L., A. E. McDonald, M. F. Gourley y J. Bellum. Final report on LDRD project: Semiconductor surface-emitting microcavity laser spectroscopy for analysis of biological cells and microstructures. Office of Scientific and Technical Information (OSTI), agosto de 1997. http://dx.doi.org/10.2172/527562.

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Hsia, K. Jimmy, Arne J. Pearlstein, Alexander Scheeline y Jian Ku Shang. Oxide film microstructure: the link between surface preparation processes and strength/durability of adhesively bonded aluminum. Final report. Office of Scientific and Technical Information (OSTI), noviembre de 2000. http://dx.doi.org/10.2172/771280.

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Hanrahan, R. J. Jr, M. E. Hawley y G. W. Brown. The influence of surface morphology and oxide microstructure on the nucleation and growth of uranium hydride on alpha uranium. Office of Scientific and Technical Information (OSTI), diciembre de 1998. http://dx.doi.org/10.2172/296785.

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