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Bioinspired Superhydrophobic Nano And Microstructured Surfaces For Drag Reduction And Optoelectronics
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Book Synopsis Bioinspired Superhydrophobic Nano- and Microstructured Surfaces for Drag Reduction and Optoelectronics by : Felix Vüllers
Download or read book Bioinspired Superhydrophobic Nano- and Microstructured Surfaces for Drag Reduction and Optoelectronics written by Felix Vüllers and published by KIT Scientific Publishing. This book was released on 2018-08-29 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inspired by superhydrophobic leaves of water plants, a flexible superhydrophobic self-cleaning, transparent thin polymeric nanofur film was fabricated through highly scalable hot embossing and hot pulling techniques. Nanofur can retain an air film underwater, whose stability against external stimuli such as high pressure and movement through fluids is investigated. Additionally, the optical properties of nanofur are investigated and exploited to enhance the efficiency of optoelectronic devices.
Book Synopsis Bioinspired Superhydrophobic Nano- and Microstructured Surfaces for Drag Reduction and Optoelectronics by : Felix Vüllers
Download or read book Bioinspired Superhydrophobic Nano- and Microstructured Surfaces for Drag Reduction and Optoelectronics written by Felix Vüllers and published by . This book was released on 2020-10-09 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inspired by superhydrophobic leaves of water plants, a flexible superhydrophobic self-cleaning, transparent thin polymeric nanofur film was fabricated through highly scalable hot embossing and hot pulling techniques. Nanofur can retain an air film underwater, whose stability against external stimuli such as high pressure and movement through fluids is investigated. Additionally, the optical properties of nanofur are investigated and exploited to enhance the efficiency of optoelectronic devices. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
Book Synopsis NMR micro-detectors tailored for multinuclear and electrochemistry lab-on-a-chip applications by : Davoodi, Hossein
Download or read book NMR micro-detectors tailored for multinuclear and electrochemistry lab-on-a-chip applications written by Davoodi, Hossein and published by KIT Scientific Publishing. This book was released on 2022-01-14 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work offers three solutions tailored to specific applications to overcome NMR challenges in the micro-domain. As the first sub-topic of this work, different potential electrode designs, compatible with NMR technique, are suggested and experimentally evaluated. As the second focus point, this work tackles multinuclear detection challenges. In parallel, a low-cost, broadband insert is discussed to enhance the sensitivity of standard NMR coils when a small sample volume is available.
Book Synopsis Innovative micro-NMR/MRI functionality utilizing flexible electronics and control systems by : Nassar, Omar
Download or read book Innovative micro-NMR/MRI functionality utilizing flexible electronics and control systems written by Nassar, Omar and published by KIT Scientific Publishing. This book was released on 2023-08-15 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advantages offered by the flexible electronics and control systems technologies were utilized for tackling the challenges facing two crucial Magnetic Resonance (MR) applications. The first application is in the field of interventional Magnetic Resonance Imaging (MRI), and the other application is in the field of Nuclear Magnetic Resonance spectroscopy (NMR).
Book Synopsis Photon upconversion heterostructures made from surface-anchored metal-organic frameworks by : Oldenburg, Michael
Download or read book Photon upconversion heterostructures made from surface-anchored metal-organic frameworks written by Oldenburg, Michael and published by KIT Scientific Publishing. This book was released on 2019-01-22 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Elastocaloric Cooling Devices Based on Shape Memory Alloy Films by : Brüderlin, Florian
Download or read book Advanced Elastocaloric Cooling Devices Based on Shape Memory Alloy Films written by Brüderlin, Florian and published by KIT Scientific Publishing. This book was released on 2022-11-15 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elastocaloric cooling is an emerging solid-state cooling technology with the potential to provide environmentally friendly, efficient cooling. The elastocaloric effect in superelastic shape memory alloy films is used to develop advanced cooling devices for small-scale applications. Cascaded and parallelized devices are developed to increase device temperature span and cooling capacity. The concepts are proven experimentally, a maximum temperature span of 27° C is achieved in a cascaded device.
Book Synopsis In Situ Characterization and Modelling of Drying Dynamics for Scalable Printing of Hybrid Perovskite Photovoltaics by : Ternes, Simon
Download or read book In Situ Characterization and Modelling of Drying Dynamics for Scalable Printing of Hybrid Perovskite Photovoltaics written by Ternes, Simon and published by KIT Scientific Publishing. This book was released on 2023-03-27 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid perovskite photovoltaics could play a vital role in future’s renewable energy production. However, there are still severe challenges when scaling the technology. In this work, perovskite solution films drying in laminar and slot-jet air flows are investigated extensively by optical in situ characterization. The main results are a quantitative model of perovskite drying dynamics and a novel in situ imaging technique – yielding valuable predictions for large-scale perovskite fabrication.
Book Synopsis Power Generation by Resonant Self-Actuation by : Joseph, Joel
Download or read book Power Generation by Resonant Self-Actuation written by Joseph, Joel and published by KIT Scientific Publishing. This book was released on 2023-12-28 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die Forschung im Bereich der Mikro-Energiegewinnungssysteme wurde durch den Bedarf an autarken, stabilen Energiequellen für vernetzte drahtlose Sensoren vorangetrieben. Abwärme, insbesondere bei Temperaturen unter 200 °C, stellt eine vielversprechende, aber mit den derzeitigen Umwandlungstechnologien schwer zu gewinnende Energiequelle dar. - Research into micro energy harvesting systems has been driven by the need for self-sustaining, stable power sources for interconnected wireless sensors. Waste heat, particularly at temperatures below 200 °C, presents a promising but challenging energy source to recover using current conversion technology.
Book Synopsis Bioinspired Superhydrophobic Surfaces by : Frédéric Guittard
Download or read book Bioinspired Superhydrophobic Surfaces written by Frédéric Guittard and published by CRC Press. This book was released on 2017-10-06 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials with superhydrophobic or related properties are one of the most studied subjects from a theoretical point of view and also for the large range of possible applications, for example, anticorrosion, antibacteria, optical devices, and sensors. The study of natural species with special wettability has shown us the importance of surface structures and the surface energy of the resulting surface properties. Various strategies can be used to reproduce superhydrophobic phenomena in the laboratory. General reviews on superhydrophobic properties already exist but, to our knowledge, do not focus on metallic and inorganic materials. Here, we focus especially on the strategies implemented for reaching superhydrophobic or related properties using metallic and inorganic materials. Indeed, these materials present unique properties, for example, thermal and mechanical resistance, chemical and ageing resistance, and optical (transparency, antireflection, photoluminescence) and electrical properties (conducting, semiconducting, insulating). This book will be useful for graduate students of materials chemistry and physics and for researchers in surface science, nanostructures, and bioinspired or biomimetic materials.
Book Synopsis Superhydrophobic Surfaces by : Mehdi Khodaei
Download or read book Superhydrophobic Surfaces written by Mehdi Khodaei and published by . This book was released on 2020 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past decade, the superhydrophobic surfaces, bio-inspired non-wettable surfaces, have aroused worldwide interest. The super water-repellant surface has special characteristics such as low surface energy as well as hierarchical micro/nano surface roughness. These surfaces have many practical applications, from industrial to biomedical applications, including water/oil separation, self-cleaning, drag reduction, anti-fogging, anti-bacterial, anti-fouling, anti-icing, corrosion resistance, as well as many applications in industries such as marine, oil, and gas, aerospace, biomedicine etc. This book presents knowledge on the field of application of superhydrophobic surfaces. Superhydrophobicity has become a hot topic in the academics as well as industries in different engineering and biomedicine research fields.
Book Synopsis Investigation of Interfacial Phenomena on Bio-inspired Micro/nano-engineered Superhydrophobic Surfaces by :
Download or read book Investigation of Interfacial Phenomena on Bio-inspired Micro/nano-engineered Superhydrophobic Surfaces written by and published by . This book was released on 2013 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Superhydrophobic Surfaces by : Mehdi Khodaei
Download or read book Superhydrophobic Surfaces written by Mehdi Khodaei and published by . This book was released on 2020 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past decade, the superhydrophobic surfaces, bio-inspired non-wettable surfaces, have aroused worldwide interest. The super water-repellant surface has special characteristics such as low surface energy as well as hierarchical micro/nano surface roughness. These surfaces have many practical applications, from industrial to biomedical applications, including water/oil separation, self-cleaning, drag reduction, anti-fogging, anti-bacterial, anti-fouling, anti-icing, corrosion resistance, as well as many applications in industries such as marine, oil, and gas, aerospace, biomedicine etc. This book presents knowledge on the field of application of superhydrophobic surfaces. Superhydrophobicity has become a hot topic in the academics as well as industries in different engineering and biomedicine research fields.
Book Synopsis Bio-inspired Oleophobic/conductive Micro/nano Structures and Their Applications in Frozen Oil Adhesion Reduction by : Zihe Pan
Download or read book Bio-inspired Oleophobic/conductive Micro/nano Structures and Their Applications in Frozen Oil Adhesion Reduction written by Zihe Pan and published by . This book was released on 2016 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inspired by the excellent superhydrophobicity and self-cleaning properties of the lotus leaf, numerous superhydro-oleophobic micro/nanostructures have been developed which mimicked biological systems. These structures have broad applications in industrial processes, especially oil transportation, oil/water separation and anti-fouling applications where oil adhesion is a critical factor. Although the adhesion properties of oils have been well explored on a variety of surfaces at ambient environment, low temperature behaviors were rarely reported especially when the oil is frozen under a frigid environment. For instance, there are cases in which oils are stuck or frozen onto the walls of engines or pipelines resulting in a large drag force thus leading to excess energy consumption and potential instrument malfunction. In this research project, the initial stage was mainly focused on developing an effective approach to construct well-defined superhydro-oleophobic microstructures and investigating the effects of structures and surface chemistry on superoleophobicity. In this stage, two different chemical modification approaches were applied to both flat and micropillared PDMS: 1) vapour deposition of trichloro (1H, 1H, 2H, 2H-perfluorooctyl) silane (FDTS) on cured polydimethylsiloxane (PDMS) elastomer surface (FDTS coated PDMS); 2) blending FDTS with the liquid PDMS precursor before curing (FDTS blended PDMS). Surfaces with varied oleophobicity were fabricated to investigate the effects of superhydro-oleophobicity on the reduction of frozen oil adhesion as characterized by knock-off tests. The relationship between the oleophobicity, which ranged from oleophilic flat surfaces to superoleophobic micropillars, and the reduction of oil adhesion at low temperatures was examined. It was observed that reduced contact angle hysteresis (CAH) led to reduced adhesion strength. By blending FDTS into PDMS micropillars, 60% adhesion strength reduction compared with flat surfaces was achieved. In order to eliminate the frozen oil effectively, electrical de-freezing was proposed by passing electrical current through the top surface layer to induce joule heating effect. To achieve this, epoxy-silver flakes composite micropillars were developed, demonstrating electrical conductivity and superoleophobicity. The effects of resistivity and superoleophobicity on the reduction and elimination of frozen-oil adhesion have been systematically studied, showing that the larger the resistivity and the oleophobicity, the less force was needed to remove frozen-oil droplet. After developing the electrically conductive polymer composite micropillars for eliminating frozen oil adhesion, we have extended this work, aiming to reduce the amount of conductive Ag flakes in the composite and make stretchable multifunctional composite elastomers. Electrically conductive and superoleophobic PDMS has been fabricated by embedding Ag flakes (SFs) & Ag nanowires (SNWs) into microstructures of the FDTS-blended PDMS elastomer achieved in the first stage of this project. A series of surface analyses and characterizations showed that highly conductive and superoleophobic surfaces were indeed obtained with a relatively low surface coverage of conductive fillers. A significant improvement to the conductivity was further achieved by using SNWs to partially replace the SFs. The stretchability and conductivity were examined under external strain, which showed that the as-prepared samples are highly stretchable and reversible. The electrical resistance of the SFs/SNWs embedded surface was less dependent on the strain due to the presence of the SNWs, creating a bridging effect and allowing current to flow consistently even as the silver particles were stretched apart from each other. This research demonstrates a simple approach to transform insulating elastomers into functional composites with a desired surface oleophobicity and electrical conductivity, which is of great help for the development multifunctional superoleophobic structures and their applications in oil adhesion reduction at low temperatures.
Book Synopsis Fabrication of Bioinspired Micro/Nano Topography Surfaces Through Scalable Roll Coating Process by : Sekkappan Chockalingam
Download or read book Fabrication of Bioinspired Micro/Nano Topography Surfaces Through Scalable Roll Coating Process written by Sekkappan Chockalingam and published by . This book was released on 2021 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Natural and Biomimetic Artificial Surfaces for Superhydrophobicity, Self-cleaning, Low Adhesion, and Drag Reduction by : Yong Chae Jung
Download or read book Natural and Biomimetic Artificial Surfaces for Superhydrophobicity, Self-cleaning, Low Adhesion, and Drag Reduction written by Yong Chae Jung and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Nature has developed materials, objects, and processes that function from the macroscale to the nanoscale. The emerging field of biomimetics allows one to mimic biology or nature to develop nanomaterials, nanodevices, and processes which provide desirable properties. Hierarchical structures with dimensions of features ranging from the macroscale to the nanoscale are extremely common in nature to provide properties of interest. There are a large number of objects including bacteria, plants, land and aquatic animals, and seashells with properties of commercial interest. Certain plant leaves, such as Lotus leaves, are known to be superhydrophobic and self-cleaning due to the hierarchical roughness of their leaf surfaces. The self-cleaning phenomenon is widely known as the "Lotus effect". These surfaces with high contact angle and low contact angle hysteresis with a self-cleaning effect also exhibit low adhesion and drag reduction for fluid flow. In this thesis, the theoretical mechanisms of the wetting of rough surfaces are presented followed by the characterization of natural leaf surfaces. The next logical step is to realize superhydrophobic surfaces based on understanding of the leaves. Next, a comprehensive review is presented on artificial superhydrophobic surfaces fabricated using various fabrication techniques and the influence of micro-, nano- and hierarchical structures on superhydrophobicity, self-cleaning, low adhesion, and drag reduction. An aquatic animal, such as a shark, is another model from nature for the reduction of drag in fluid flow. The artificial surfaces from the shark skin have been created, and the influence of structure on drag reduction efficiency is discussed. Furthermore, oleophobic surfaces can be used as a biomimetic coating that prevents contamination of the underwater parts of ships by biological and organic contaminants, including oil. The thesis discusses the wetting behavior of oil droplets on various superoleophobic surfaces.
Book Synopsis Superhydrophobic Surfaces by : Mehdi Khodaei
Download or read book Superhydrophobic Surfaces written by Mehdi Khodaei and published by . This book was released on 2020-07 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wetting and Wettability by : Mahmood Aliofkhazraei
Download or read book Wetting and Wettability written by Mahmood Aliofkhazraei and published by BoD – Books on Demand. This book was released on 2015-12-16 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the liquid 's surface, the molecules have fewer neighbors in comparison with the bulk volume. As a result, the energy interaction shows itself in the surface tension. Traditionally, the surface tension can be assumed as a force in the unit of the length which can be counted by the unit of Newton on squared meter, or energy on the units of the surface. The surface tension, implies the interface between liquid and vapor, which is an example of the surface tensions. The equilibrium between these surface tensions, decides that a droplet on a solid surface, would have a droplet form or will change to layer form. This book collects new developments in wetting and wettability science.
