Relevant bibliographies by topics / Nanoporous

Academic literature on the topic 'Nanoporous'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 July 2024

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Journal articles on the topic "Nanoporous"

Sa, Na, Sue-Sin Chong, Hui-Qiong Wang, and Jin-Cheng Zheng. "Anisotropy Engineering of ZnO Nanoporous Frameworks: A Lattice Dynamics Simulation." Nanomaterials 12, no. 18 (September 18, 2022): 3239. http://dx.doi.org/10.3390/nano12183239.

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The anisotropy engineering of nanoporous zinc oxide (ZnO) frameworks has been performed by lattice dynamics simulation. A series of zinc oxide (ZnO) nanoporous framework structures was designed by creating nanopores with different sizes and shapes. We examined the size effects of varying several features of the nanoporous framework (namely, the removal of layers of atoms, surface-area-to-volume ratio, coordination number, porosity, and density) on its mechanical properties (including bulk modulus, Young’s modulus, elastic constant, and Poisson ratio) with both lattice dynamics simulations. We also found that the anisotropy of nanoporous framework can be drastically tuned by changing the shape of nanopores. The maximum anisotropy (defined by Ymax/Ymin) of the Young’s modulus value increases from 1.2 for bulk ZnO to 2.5 for hexagon-prism-shaped ZnO nanoporous framework structures, with a density of 2.72 g/cm3, and, even more remarkably, to 89.8 for a diamond-prism-shape at a density of 1.72 g/cm3. Our findings suggest a new route for desirable anisotropy and mechanical property engineering with nanoporous frameworks by editing the shapes of the nanopores for the desired anisotropy.

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Her, Hyun Jung, Jung Min Kim, Yun Soo Lim, Jae Wan Kim, Y. J. Choi, C. J. Kang, and Yong Sang Kim. "Nanoporous Titania by Embossing with PMMA Nanopoles Made from Nanoporous Alumina Template." Materials Science Forum 544-545 (May 2007): 1017–20. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.1017.

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We produced highly uniform nanoporous thin films of the dense array of titania (TiO2) pores of 70~80 nm in diameter with nanoimprinting method. Titania in HCl and 2-propanol solution was coated on an indium tin oxide (ITO) surface and embossed with an array of PMMA nanopoles which was produced using a nanoporous alumina (Al2O3) template. Two-step anodization was introduced to produce highly uniform and dense nanopores on the aluminum surface. The polymethyl methacrylate (PMMA) was poured onto and infiltrated into the nanoporous alumina surface which was heated at 150 oC. The alumina nanopores and aluminum plate were removed by wet-etching leaving an array of PMMA nanopoles. These highly uniform nanostructured titania films will be very useful for photovoltaic and photocatalytic applications where nanostructuring of surface with controlled dimensions are essential.

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Chou, Chia-Man, Tong-You Wade Wei, Jou-May Maureen Chen, Wei-Ting Chang, Chang-Tze Ricky Yu, and Vincent K. S. Hsiao. "Preparation of Nanoporous Polymer Films for Real-Time Viability Monitoring of Cells." Journal of Nanomaterials 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/436528.

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We have demonstrated an alternative way to monitor the viability of cells adhered on a nanoporous polymer film in real time. The nanoporous polymer films were prepared by laser interference pattering. During exposure of holographic patterning, the dissolved solvents were phase separated with photocured polymer and the nanopores were created as the solvents evaporated. The diffracted spectra from the nanoporous polymer film responded to each activity of the cell cycle, from initial cell seeding, through growth, and eventual cell death. This cell-based biosensor uses a nanoporous polymer film to noninvasively monitor cell viability and may prove useful for biotechnological applications.

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MO, YANG, and TAN FEI. "NANOPOROUS MEMBRANE FOR BIOSENSING APPLICATIONS." Nano LIFE 02, no. 01 (March 2012): 1230003. http://dx.doi.org/10.1142/s1793984411000323.

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Synthetic nanoporous membranes have been used in numerous biosensing applications, such as glucose detection, nucleic acid detection, bacteria detection, and cell-based sensing. The increased surface affinity area and enhanced output sensing signals make the nanoporous membranes increasingly attractive as biosensing platforms. Surface modification techniques can be used to improve surface properties for realizable bioanalyte immobilization, conjugation, and detection. Combined with realizable detection techniques such as electrochemical and optical detection methods, nanoporous membrane–based biosensors have advantages, including rapid response, high sensitivity, and low cost. In this paper, an overview of nanoporous membranes for biosensing application is given. Types of nanoporous membranes including polymer membranes, inorganic membranes, membranes with nanopores fabricated using nanolithography, and nanotube-based membranes are introduced. The fabrication techniques of nanoporous membranes are also discussed. The key requirements of nanoporous membranes for biosensing applications include surface functionality for bioanalyte immobilization, biocompatibility, mechanical and chemical stability, and anti-biofouling capability. The recent advances and development of nanoporous membrane–based biosensors are discussed, especially for the sensing mechanism and surface functionalization strategies. Finally, the challenges and future development of nanoporous membrane for biosensing applications are discussed.

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Petryk, Mykhaylo, and Dmytro Mykhalyk. "High-performance intellectual information technologies for the study of filtration systems in different-sized nanoporous particles media." Scientific journal of the Ternopil national technical university 108, no. 4 (2022): 16–26. http://dx.doi.org/10.33108/visnyk_tntu2022.04.016.

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In the paper, the technologies for the high-performance intellectual nanoporous filtration systems based on the mathematical model of the two-level transport «filtration-consolidation» in the system of nanopores in two intraparticle spaces, which includes two subspaces of different-sized nanoporous particles are developed.

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Nasr Esfahani, Mohammad, and Masoud Jabbari. "Molecular Dynamics Simulations of Deformation Mechanisms in the Mechanical Response of Nanoporous Gold." Materials 13, no. 9 (April 30, 2020): 2071. http://dx.doi.org/10.3390/ma13092071.

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The mechanical behaviour of nanoporous gold has so far been the subject of studies for bicontinuous morphologies, while the load transfer between ligaments is the primary challenge for using nanoporous structures—especially membranes with nanopores—in single-molecule sensors. This work studies the pore shape effect on deformation mechanisms of nanoporous gold membranes through molecular dynamics simulations. Tension and compression tests are carried out for nanoporous gold with circular, elliptical, square and hexagonal pore shapes. A significant pore shape effect on the mechanical properties is observed with distinct load transfer capabilities. A uniform stress transfer between ligaments constitutes a distinguished set of mechanical responses for structures with the hexagonal pore shape under tension, while a unique stress distribution in nanoporous with the circular pore shape introduces a high strength and ductile structure under compression. Further to shed light on the existing experimental observations, this work provides a comprehensive study on load transfer capabilities in the mechanical behaviour of nanoporous gold for sensing applications.

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Tsunekane, Masafumi, Kyosuke Yoshimi, and Kouichi Maruyama. "Attempt to Control Spatial Distribution of Nano-Gold Particles Using Nanoporous Surfaces of FeAl Single Crystal." Advanced Materials Research 26-28 (October 2007): 185–88. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.185.

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In this study, the distribution of colloidal nano-gold particles on the nanoporous surfaces of FeAl single crystals was investigated. Colloidal nano-gold particles were dropped onto the nanoporous surface, and their distribution was observed by TEM. Some of nano-gold particles located at the edges of nanopores. A few additional attempts to improve the wettability of the surfaces were made using surface treatments. As a result, the frequency of nano-gold particles put into nanopores was achieved up to 98.3%.

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Suciu, Claudiu Valentin, and Shuuhei Fukui. "Rheological Model for a Nanoporous-Elasto-Hydrodynamic Composite Material." Materials Science Forum 750 (March 2013): 100–103. http://dx.doi.org/10.4028/www.scientific.net/msf.750.100.

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This work proposes a rheological model for a nanoporous-elasto-hydrodynamic composite material (NPEHDCM), which can be obtained by mixing a colloid, consisted of water and water-repellent nanoporous silica micro-particles, with an adequate jellification agent. Hydrogel is modeled as a biphasic mixture consisted of a nanoporous hydrophilic isotropic and linear elastic solid matrix, and a liquid phase (water). At dynamic pressurization, water molecules exude from the hydrogel matrix and forcedly penetrate the nanopores of hydrophobic silica particles. Based on the proposed rheological model, the NPEHDCM can be suitably designed.

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Brüggemann, Dorothea. "Nanoporous Aluminium Oxide Membranes as Cell Interfaces." Journal of Nanomaterials 2013 (2013): 1–18. http://dx.doi.org/10.1155/2013/460870.

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Nanoporous anodic aluminium oxide (AAO) has become increasingly important in biomedical applications over the past years due to its biocompatibility, increased surface area, and the possibility to tailor this nanomaterial with a wide range of surface modifications. AAO nanopores are formed in an inexpensive anodisation process of pure aluminium, which results in the self-assembly of highly ordered, vertical nanochannels with well-controllable pore diameters, depths, and interpore distances. Because of these outstanding properties AAO nanopores have become excellent candidates as nanostructured substrates for cell-interface studies. In this comprehensive review previous surveys on cell adhesion and proliferation on different AAO nanopore geometries and surface modifications are highlighted and summarised tabularly. Future applications of nanoporous alumina membranes in biotechnology and medicine are also outlined, for instance, the use of nanoporous AAO as implant modifications, coculture substrates, or immunoisolation devices.

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Wang, Ya, Hai Wang, and Wei Wan. "The Incorporation of Carbon Element into Nanoporous Anodic Alumina by Pulse Anodization." Journal of Nanoscience and Nanotechnology 19, no. 6 (June 1, 2019): 3621–26. http://dx.doi.org/10.1166/jnn.2019.16126.

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The incorporation of carbon element into nanoporous anodic aluminum oxides from oxalic acid electrolyte was studied. The carbon element content in nanoporous anodic alumina by pulse anodization reaches up to ∼20 at.%, while it remains ∼7 at.% under constant anodization. It was proposed that the ionic dynamics in nanopores governs the carbon-containing anions incorporation into nanoporous anodic oxides. For the same 20 V resting voltage, the content of carbon element remains unchanged in a broad range of working voltages: 40–150 V. X-ray photoelectron analysis further revealed that the sp2/sp3 and C–O/C═O ratios increased significantly as the working voltage increased. The color exhibited by the nanoporous anodic alumina was related to the chemical states of the carbon present in the alumina, and not the carbon content.

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Dissertations / Theses on the topic "Nanoporous"

Pugh, Dylan Vicente. "Nanoporous Platinum." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/27256.

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Dealloying is a corrosion process in which one or more elements are selectively removed from an alloy leading to a 3-dimensional porous structure of the more noble element(s). These porous structures have been known to cause stress corrosion cracking in noble metal alloy systems but more recent interest in using the corrosion process to produce porous metals has developed. Applications for these structures range from high surface area electrodes for biomedical sensors to use as skeletal structures for fundamental studies (e.g. low temperature heat exchangers or sensitivity of surface diffusivity to chemical environment). In this work we will review our current understanding of alloy corrosion including our most recent results demonstrating a more accurate method for calculating alloy critical potential based on potential hold experiments. The critical potentials calculated through the potential hold method were â 0.030VMSE, 0.110VMSE, and 0.175VMSE for Cu80Pt20, Cu75Pt25 Cu71Pt29 respectively. We will present the use of porous metals for making surface diffusivity measurements in the Pt systems as a function of chemical environment. A review of the use of small angle neutron scattering to make accurate measurements of pore size is presented and the sensitivity of pore size to electrolyte, electrolyte composition, applied potential and temperature will be explained. The production of porous Pt with pore sizes ranging from 2-200nm is demonstrated.
Ph. D.

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Nguyen, Thanh Xuan. "Characterization of nanoporous carbons /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19108.pdf.

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Wilke, Kyle (Kyle L. ). "Evaporation from nanoporous membranes." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104571.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 56-58).
Cooling demands of advanced electronics are increasing rapidly, often exceeding capabilities of conventional thermal management techniques. Thin film evaporation has emerged as one of the most promising thermal management solutions. High heat transfer rates can be achieved in thin films of liquids due to a small conduction resistance through the film to the evaporating interface. In this thesis, we investigated evaporation from nanoporous membranes. The capillary wicking of the nanopores supplies liquid to the evaporating interface, passively maintaining the thin film. Different evaporation regimes were predicted through modeling and were demonstrated experimentally. Good agreement was shown between the predicted and observed transitions between regimes. Improved heat transfer performance was demonstrated in the pore level evaporation regime over other regimes, with heat transfer rates up to one order of magnitude larger for a given superheat in comparison to the flooding regime. An improved experimental setup for investigating thin film evaporation from nanopores was developed, where a biphilic membrane, i.e., a membrane with two wetting behaviors, was used for enhanced experimental control to allow characterization of the importance of different design parameters. This improved setup was then used to demonstrate the dependence of thin film evaporation on the location of the meniscus within the nanopores. This dependence on meniscus location within the pore was also shown to increase with increasing superheat. We observed a 46% reduction in heat transfer rates at a superheat of 15 °C for an L* of 14.67 compared to an L* of 2, where L* is the ratio of the depth of the meniscus within the pore to the pore radius. This work provides practical insights for the design of devices based on nanoporous evaporation. Heat transfer regimes can be predicted based on fluid supply conditions, evaporative heat flux, and membrane geometry. Furthermore, the biphilic membrane serves as a valuable experimental platform for testing the role of membrane geometry on heat transfer performance in the pore level evaporation regime. Future work will focus on demonstrating the importance of different parameters and using experimental results to either validate existing models for evaporation from nanopores or develop more suitable ones.
by Kyle Wilke.
S.M.

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Crowson, Douglas A. "Stability of Nanoporous Metals." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28111.

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A study of the stability of bicontinuous nanoporous metals is presented. Atomic scale simulations are used to probe the dominant mechanisms of geometric relaxation in these materials. A method is presented for generating model bicontinuous metal / void structures for use in atomistic simulations of bicontinuous nanoporous solids. The structures are generated with periodic boundary conditions using a phase-field model to simulate the spinodal decomposition of an ideal system. One phase in the model is then associated with the pore volume while the other phase is associated with the metal ligaments. Small angle neutron scattering was used to quantitatively compare experimental samples to those generated by the phase field method. EAM results using model structures with experimentally accessible length scales are presented which demonstrate the potential of such simulations in understanding the behavior of nanoporous metals. Simulated relaxations of these structures, as well as the relaxation of model spherical clusters, indicate that the surface relaxation effect dominates the overall dimensional relaxation of np-metals post processing. Capillary effects play a secondary role in the overall relaxation. The simulation results presented also identify a maximum surface area to volume ratio necessary to maintain mechanical stability beyond which the pore structure collapses.
Ph. D.

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Cooney, D. T. P. "Nanoporous materials from block copolymers." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597952.

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This project assesses the potential for block copolymers (BCPs) to be used in making nanoporous membranes. BCPs self assemble to produce structured phase morphologies based on their molecular composition. One such structure is composed of cylinders of one polymer phase in a matrix of another. It is proposed that nanoporous products could be produced by selectivity removing the material forming the cylindrical phase in an aligned BCP sample. Methods of inducing good phase alignment in BCP samples are reviewed. The effects of high shear rates on the orientation of a cylindrical phase formed by a triblock copolymer are investigated using the Cambridge Multipass Rheometer and a customised X-ray diffraction system. A new X-ray collection technique is developed and used to show that high shear rates can destroy phase orientation in a BCP melt. BCP etching is investigated. The removal of a cylindrical poly(lactide) phase in a P(S-b-LA) BCP by hydrolysis is examined. The method is shown to produce complete removal of the PLA phase, with the etch considered to be reaction limited. Diffusion of acid and alkali through such etched samples is observed in a specially designed cell. Transport in aqueous conditions is established through samples up to 7 mm long, proving pore continuity in the material and establishing the practical validity of the proposed idea. Thin films of BCP aligned using electric fields are obtained and etched. Acid transport through the films indicates porosity has been introduced. Size exclusion experiments using gold colloids prove that small particles are transmitted by these films, whilst large particles are retained. These experiments establish that size separation could be conducted using BCP products, as proposed, and form the basis for future work in developing such products.

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Preuss, Frida, Julia Asp, Sofia Larsson, and Stephanie Kylington. "Separation of Nanoporous Silica Particles." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277106.

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In this study a sample of particles in a size region of 0.05-10 μm were run through a centrifugation process with the ambition to make it monodisperse. The product requirements were stated as follows, particles within the size range of 2 to 3.8 μm should be isolated and separated from the sample with a D90/D10 < 1.4 where the D90/D50/D10 values should be approximately 3.8 μm/2.5 μm/2 μm. It was found that two layers of sucrose with a 50/50 volume distribution of 45w% sucrose solution and 60w% sucrose solution respectively, was the most efficient density gradient arrangement for separation of this particular sample. The optimal time and RPM combination was found to be 5 min 3000 RPM with a fast acceleration and slower deceleration, ratio 9:6. Two centrifugation rounds on the same sample improved D90/D10 drastically. The effect of centrifugation rounds on D90/D10 was not investigated further than 3 rounds, however this would be a good starting point for further studies. The upscaled test runs indicated a positive result, i.e. the yields with respect to both mass and purity were reproducible. It is worth mentioning that the upscale was only in the volume, sample load volume and surface area factors. The gradient height or particle travel distance remained the same.

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Odunsi, Oluwatoni Yewande. "Hydrogen storage on nanoporous carbons." Thesis, University of Bath, 2007. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437723.

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Morgado, Lopes André. "Reactive transport through nanoporous materials." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0560/document.

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Le but de cette thèse est d’étudier le comportement des asphaltènes dans des condition de hydrotraitement, y compris les propriétés de transport et d’adsorption. La chromatographie d'exclusion stérique inverse (ISEC) ainsi que la spectroscopie d'impédance sont utilisées pour déterminer des paramètres topologiques de solides poreux d’alumine (porosité, taille de pores, tortuosité). Des coefficients de diffusion effectifs de polystyrènes de différentes tailles sont aussi étudiés par chromatographie liquide en conditions non-adsorbantes: les molécules de petites tailles pénètrent plus profondément dans le milieu poreux donc elles prennent plus de temps pour traverser la colonne, tandis que les molécules ayant une taille supérieure à la taille du pore ne sondent que la macroporosité. Avec l'utilisation des méthodes dynamique et «peak parking», il est possible de modéliser le transport des molécules de différentes tailles, et cela aidera à prédire le comportement de molécules d’une taille quelconque. Les colonnes ont été assemblées au laboratoire à partir de poudres et de monolithes d’alumine. Les caractéristiques d'adsorption des asphaltènes modèles sont déterminées et comparées avec une fraction d’asphaltènes extraite d’un brut. Un phénomène de dimérisation ainsi qu’une très forte adsorption sur la surface de l’alumine sont observés avec la molécule modèle. La méthode dynamique a été utilisée avec des colonnes courtes dans des conditions de saturation. Une influence apparente du débit dans l’importance et le mécanisme d’adsorption a pu être constatée
This work aims to study the complex behaviors of asphaltenes within the hydrotreatment catalytic porous system including transport properties and adsorption. Inverse size-exclusion chromatography (ISEC) and impedance spectroscopy are used to determine the topological characteristics of different alumina porous solids (porosity, pore size, tortuosity). The effective diffusion coefficient of polystyrenes of different sizes was studied via chromatography in non-adsorbing conditions. Elution peaks are used to determine the effect of molecule size on the accessible pore volume and the transport properties therein: molecules of relatively small sizes penetrate further into the porous medium, thus taking more time to navigate the chromatographic setup, while larger molecules traverse much faster, through the macroporosity. The liquid chromatography technique is divided in two different methods. Both methods yield diffusion coefficient values which are modelled, predicting the behavior of molecules of any size. Columns were assembled manually from alumina powders or monoliths. A synthesized asphaltene model molecule was used and its adsorption behavior was determined and compared to an asphaltene fraction recovered from crude oil. The asphaltene model molecule shows a dimerization behavior as well as extremely strong interactions with the alumina surface. Dynamic method was attempted in short alumina columns at saturation conditions and an apparent influence of the flow rate on the extent and mechanics of adsorption was observed

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Freeman, Christopher J. "Biosensing and Catalysis Applications of Nanoporous Gold (NPG) and Platinum-Speckled Nanoporous Gold (NPG-Pt) Electrodes." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5473.

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The importance of porous materials has risen substantially in the last few decades due to their ability to reduce the size and cost of bioanalytical devices and fuel cells. First, this work aims to describe the fabrication of nanoporous gold (NPG) electrodes that are resistant to electrode passivation due to fibrinogen biofouling in redox solutions. The effect on potentiometric and voltammetric experiments was seen as a deviation from ideal behavior on planar gold electrodes, whereas NPG electrodes were consistently behaving in a Nernstian fashion at low concentrations of ferri-ferrocyanide (£100 mM). An improvement in electrode behavior on NPG electrodes versus planar gold was seen in solutions containing ascorbic acid as well as blood plasma. Second, cost effective NPG electrodes were fabricated using a glass substrate to test the response in the presence of a variety of redox molecules. The optical transparency of these electrodes allowed for microdroplet measurements to be made using an inverted microscope in several redox solutions for validation and subsequent biological applicability. Nernstian behavior was demonstrated for all one- and two-electron transfer systems in both poised and unpoised solutions. All experiments were conducted using volumes between 280 and 1400 pL producing rapid results in less than one minute. Third, in order to decrease the requirement for complex instrumentation, microdroplet fabrication technique was used to create mini-nanoporous gold (mNPG) electrodes on glass capillary tubes. The cylindrical shape of the electrodes allowed for testing in sample volumes of 100 mL. The response to ferri-ferrocyanide, ascorbic acid, cysteine, and uric acid was then investigated with Nernstian behavior shown. However, the mNPG electrodes were insensitive to glucose and hydrogen peroxide. In order to increase the sensitivity of the electrodes, a minimal amount of platinum was electrodeposited onto the NPG surface using a low concentration of platinum salt (0.75 mM) for a short deposition time (2 seconds) producing a Nernstian response to both glucose and hydrogen peroxide. Lastly, to test the viability of crossover applications, the platinum incorporated NPG electrode was employed as a fuel cell anode material, testing their oxidation capability with methanol, ethanol, and formic acid.

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Bera, Chandan. "Thermo electric properties of nanocomposite materials." Phd thesis, Ecole Centrale Paris, 2010. http://tel.archives-ouvertes.fr/tel-00576360.

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Cette thèse présente une étude théorique du transport de chaleur dans les matériaux composites nano poreux et nano fils ainsi qu'une étude théorique des propriétés thermoélectriques de l'alliage Si0:8Ge0:2 confrontée à des mesures expérimentales réalisées pour une partie, dans le cadre de l'étude.La première étude démontre que les alliages poreux affichent des réductions de conductivité thermique à des dimensions de pores beaucoup plus grandes que les matériaux poreux non alliés de même porosité nominale. Si on considère une taille de pores de 1000nm, la conductivité thermique de l'alliage Si0:5Ge0:5 avec 0:1 de porosité est deux fois plus faible que la conductivité thermique d'un matériau non poreux, alors que les pores plus petits que 100 nm sont nécessaires pour obtenir la même réduction relative dans le Si ou Ge pur. Nos résultats indiquent que les alliages nano poreux devraient être avantageux devant les matériaux nano poreux non alliés, et ceux pour les applications nécessitant une faible conductivité thermique, tels que les nouveaux matériaux thermoélectriques.La deuxième étude théorique sur la conductance thermique de nano fils révèle l'effet de la structure sur le transport des phonons. Avec un modèle théorique qui considère la dépendance en fréquence du transport des phonons, nous sommes en mesure quantitativement de rendre compte des résultats expérimentaux sur des nano fils droits et coudés dans la gamme de température qui montre qu'un double coude sur un fil réduit sa conductance thermique de 40% à la température de 5K. Enfin, nous avons procédé à une approche théorique des propriétés thermoélectriques des alliages SiGe frittés, en les comparant aux mesures expérimentales nouvelles et antérieures, tout en évaluant leur potentiel d'amélioration. L'approche théorique a été validée par comparaison de la mobilité prévue et la conductivité thermique prévues, en faisant varier la quantité de Ge et les concentrations de dopage, dans une gamme de température comprise entre 300 et 1000K. Nos calculs suggèrent qu'une optimisation par rapport à l'état de l'art actuel est possible pour le matériau de type n et type p, conduisant potentiellement à une augmentation de 6% (5%) du ZT _a 1000K et 25% (4%) _a température ambiante. Même des améliorations plus grandes devraient être possibles si la probabilité de diffusion des phonons aux joints de grains pouvait être augmentée au-delà de sa valeur actuelle de 10%.

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Books on the topic "Nanoporous"

Wittstock, Arne, Jürgen Biener, Jonah Erlebacher, and Marcus Bäumer, eds. Nanoporous Gold. Cambridge: Royal Society of Chemistry, 2012. http://dx.doi.org/10.1039/9781849735285.

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Losic, Dusan, and Abel Santos, eds. Nanoporous Alumina. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8.

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Kärger, Jörg, Douglas M. Ruthven, and Doros N. Theodorou. Diffusion in Nanoporous Materials. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527651276.

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Losic, Dusan, and Abel Santos, eds. Electrochemically Engineered Nanoporous Materials. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20346-1.

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Pinnavaia, Thomas J., and M. F. Thorpe, eds. Access in Nanoporous Materials. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/b113475.

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J, Pinnavaia Thomas, Thorpe M. F, and Symposium on Access in Nanoporous Materials (1995 : Michigan State University), eds. Access in nanoporous materials. New York: Plenum Press, 1995.

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service), ScienceDirect (Online, ed. Advances in nanoporous materials. Amsterdam: Elsevier Science, 2009.

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Kaneko, Katsumi, and Francisco Rodríguez-Reinoso, eds. Nanoporous Materials for Gas Storage. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3504-4.

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Stevens, Christian V., Feng-Shou Xiao, and Liang Wang, eds. Nanoporous Catalysts for Biomass Conversion. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781119128113.

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Conner, Wm Curtis, and Jacques Fraissard, eds. Fluid Transport in Nanoporous Materials. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4382-1.

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Book chapters on the topic "Nanoporous"

Patarin, J., O. Spalla, and F. Di Renzo. "Nanoporous Media." In Nanomaterials and Nanochemistry, 569–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72993-8_26.

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Ding, Yi, and Zhonghua Zhang. "Nanoporous Metals." In Springer Handbook of Nanomaterials, 779–818. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20595-8_21.

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Cheetham, A. K., and P. M. Forster. "Nanoporous Materials." In The Chemistry of Nanomaterials, 589–619. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/352760247x.ch18.

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Jäntschi, Lorentz, and Sorana D. Bolboacă. "Nanoporous Carbon." In New Frontiers in Nanochemistry, 313–25. Includes bibliographical references and indexes. | Contents: Volume 1. Structural nanochemistry – Volume 2. Topological nanochemistry – Volume 3. Sustainable nanochemistry.: Apple Academic Press, 2020. http://dx.doi.org/10.1201/9780429022944-28.

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Ling, Zhiyuan, and Yi Li. "Mechanisms of Nanoporous Alumina Formation and Self-organized Growth." In Nanoporous Alumina, 1–30. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8_1.

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Kumeria, Tushar, and Abel Santos. "Nanoporous Alumina Membranes for Chromatography and Molecular Transporting." In Nanoporous Alumina, 293–318. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8_10.

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Aw, Moom Sinn, Manpreet Bariana, and Dusan Losic. "Nanoporous Anodic Alumina for Drug Delivery and Biomedical Applications." In Nanoporous Alumina, 319–54. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8_11.

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Cheng, Chuan, and A. H. W. Ngan. "Theoretical Pore Growth Models for Nanoporous Alumina." In Nanoporous Alumina, 31–60. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8_2.

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Zaraska, Leszek, Ewa Wierzbicka, Elżbieta Kurowska-Tabor, and Grzegorz D. Sulka. "Synthesis of Nanoporous Anodic Alumina by Anodic Oxidation of Low Purity Aluminum Substrates." In Nanoporous Alumina, 61–106. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8_3.

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Lee, Woo. "Structural Engineering of Porous Anodic Aluminum Oxide (AAO) and Applications." In Nanoporous Alumina, 107–53. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8_4.

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Conference papers on the topic "Nanoporous"

Qiao, Yu, Xinguo Kong, and Falgun B. Surani. "Nanoporous Energy Absorption Systems." In ASME 4th Integrated Nanosystems Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nano2005-87026.

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In a system consisting of hydrophobic nanoporous materials immersed in water, as the pressure increases the water can be forced into the nanopores, accompanied by a large increase in system free energy. As the pressure is reduced, however, in some nanoporous materials the defiltration is difficult and thus the excess solid-liquid interface energy can be regarded as being absorbed. Due to the ultrahigh surface area of the nanoporous material, the energy absorption efficiency of this system can be higher than that of conventional protection materials by orders of magnitude. This phenomenon has great potential in developing advanced energy absorption and damping systems such as soldier armors, protection layers, blast resistant containers, etc.

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Gan, Yong X., Surya V. Pothula, and Matthew J. Franchetti. "Plasticity of Nanoporous Ni/YSZ Anode: A Numerical Analysis." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33194.

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Thin electrolytes (YSZ) and anode-supported (nanoporous Ni-YSZ ) cells operating in the temperature range of 650–850°C are considered as promising solid oxide fuel cell systems. Understanding the thermal-mechanical deformation behavior of the Ni/YSZ interface is critical for the design and durability assessment of the YSZ high temperature fuel cells. One of the problems still remains to be solved is the microstructure instability of the nanoporous Ni at the elevated temperatures. In this work, modeling the thermal-mechanical deformation in the nanoporous Ni/YSZ interface region was performed. Nanoporous Ni thin film bounded to YSZ was considered to establish a simplified 2-D model. On the Ni/YSZ interface, the nanopores are modeled as spherical or cylindrical pores. Crystal lattice rotation due to dislocation motion was simulated and the numerical solutions to the in-plane lattice rotation for the nanoporous Ni was used to predict the microstructure evolution in the interface area of the Ni/YSZ anode.

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Hsu, Yi, and Yingtao Liu. "Investigation of Hydrophobic Nanoporous Particle Liquids for Impact Protection." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67342.

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Recently, the development of hydrophobic nanoporous liquids has drawn increased attention, especially for the applications of energy absorption and impact protection. Although significant amount of research has been conducted to synthesis and characterize materials to protect structures from impact damage, the tradition methods needed to convert kinetic energy to other forms, such as heat and cell bulking, during impact protection. Due to their high energy absorption efficiency, hydrophobic nanoporous particle liquids are one of the most attractive impact mitigation materials. When impacted, such particles directly trap liquid molecules inside the non-wetting surface of nanopores in the particles. The captured impact energy is simply stored temporarily and isolated from the original energy transmission path. In this paper we investigate the energy absorption efficiency of multiple nanoporous particles and liquids. Inorganic nanoporous silica nanoparticles are investigated as the hydrophobic materials. Nanoporous particle liquids are prepared by dispersing the nano-materials in deionized water. The effects of small molecular promoters, such as methanol and ethanol, on energy absorption efficiency, are studied in this paper. The energy absorption efficiency of these liquids is experimentally characterized using an Instron mechanical testing frame and in-house develop stainless steel hydraulic cylinder system under quasi-static load conditions.

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Oppermann, Hermann, Lothar Dietrich, Matthias Klein, and Bernhard Wunderle. "Nanoporous interconnects." In 2010 3rd Electronic System-Integration Technology Conference (ESTC). IEEE, 2010. http://dx.doi.org/10.1109/estc.2010.5643002.

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Maaroof, A. I., A. R. Gentle, M. B. Cortie, and G. B. Smith. "Nanoporous plasmonic coatings." In NanoScience + Engineering, edited by Geoffrey B. Smith and Michael B. Cortie. SPIE, 2007. http://dx.doi.org/10.1117/12.733195.

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KONDO, A., Y. TAO, H. NOGUCHI, S. UTSUMI, L. SONG, T. OHBA, H. TANAKA, et al. "NEW NANOPOROUS ADSORBENTS." In Selected Reports at the 4th Pacific Basin Conference on Adsorption Science and Technology. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812770264_0003.

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Sundaresan, Vishnu Baba, and James Patrick Carr. "Active Nanoporous Membranes for Desalination." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5193.

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Current water desalination technologies such as reverse osmosis (RO) and nanofiltration (NF) use tortuous structures and cylindrical nanopores to reject salts by size exclusion. The selective rejection of salts dissolved in water using nanopores requires large pressure gradients across the membranes to produce reasonable flow rates. The electrical power required for generating large pressure gradients increases the operational cost for desalination and limits its application as portable units in small communities and in third-world countries. Further, recently proposed desalination methods using carbon nanotubes and nanofluidic diodes have limited lifetime due to clogging and fouling from contaminants in feed water. Thus, existing or evolving technologies are expensive, bulky and not practical where it is needed the most. In order to develop a desalination system that is not limited by the disadvantages of existing systems, this article investigates the feasibility of a novel active nanopore membrane with superior ion rejection and water transport properties. An active nanopore is a shape-changing hyperboloidal pore that is formed in a rugged electroactive composite membrane and utilizes coupled electrostatic, hydrodynamic and mechanical interactions due to reversible mechanical oscillations between the charged pore walls and dissolved ions in water for desalination. This novel approach takes advantage of the shape of the pore to create a pumping action in the hyperboloidal channel to selectively transport water molecules. In order to demonstrate the applicability of this novel concept for water desalination, the paper will use a theoretical model to model the ion rejection properties and flow rate of salt-free water through an active nanoporous membrane.

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Kim, Sungho, Ece Isenbike Ozalp, Mohamed Darwish, and Jeffrey A. Weldon. "Electrically gated nanoporous membranes." In 2017 IEEE 12th International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2017. http://dx.doi.org/10.1109/nems.2017.8017131.

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Markham, M. L., D. C. Smith, J. J. Baumberg, T. Gabriel, X. Li, I. Nandhakumar, and G. S. Attard. "Nanoporous semiconductor-based metamaterials." In 2005 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2005. http://dx.doi.org/10.1109/cleo.2005.202150.

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Gao, Tieyu, Vincent Hsiao, Yue Bing Zheng, and Tony Jun Huang. "Nanoporous Polymeric Grating-Based Biosensors." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40928.

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We demonstrate the utilization of an interferometrically created nanoporous polymeric gratings as a platform for biosensing applications. Aminopropyltriethoxysilane (APTES)-functionalized nanoporous polymeric gratings was fabricated by combining holographic interference patterning and APTES-functionalization of pre-polymer syrup. The successful detection of multiple biomolecules indicates that the biofunctionalized nanoporous polymeric gratings can act as biosensing platforms which are label-free, inexpensive, and applicable as high-throughput assays.

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Reports on the topic "Nanoporous"

Braun, Paul V., Mary Elizabeth Langham, Benjamin W. Jacobs, Markus D. Ong, Roger J. Narayan, Bonnie E. Pierson, Shaun D. Gittard, et al. Optimized nanoporous materials. Office of Scientific and Technical Information (OSTI), September 2009. http://dx.doi.org/10.2172/993630.

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Cordaro, Joseph Gabriel, Nicolas R. Myllenbeck, Matthew C. George, Michael Stuart Kent, Amalie Lucile Frischknecht, Geoffrey L. Brennecka, Greg O'Bryan, and Edward H. Feng. Triblock polymers for nanoporous membranes. Office of Scientific and Technical Information (OSTI), September 2012. http://dx.doi.org/10.2172/1055932.

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Overmyer, Donald L., Michael P. Siegal, Alan W. Staton, Paula Polyak Provencio, and William Graham Yelton. Nanoporous-carbon adsorbers for chemical microsensors. Office of Scientific and Technical Information (OSTI), November 2004. http://dx.doi.org/10.2172/920117.

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Qiao, Yu. Energy Absorption Behaviors of Nanoporous Systems. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada433350.

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Howard, Stephen L., Wayne A. Churaman, and Luke J. Currano. Nanoporous Silicon Ignition of JA2 Propellant. Fort Belvoir, VA: Defense Technical Information Center, June 2014. http://dx.doi.org/10.21236/ada606476.

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Hunt, Arlon J. New Advanced Nanoporous Materials for Industrial HeatingApplications. US: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US), March 2006. http://dx.doi.org/10.2172/895530.

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Burckel, David Bruce, Daniel Koleske, Adam M. Rowen, John Dalton Williams, Hongyou Fan, and Christian Lew Arrington. Nanoporous Silica Templated HeteroEpitaxy: Final LDRD Report. Office of Scientific and Technical Information (OSTI), November 2006. http://dx.doi.org/10.2172/1137217.

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El-Kaderi, Hani M. Nanoporous Architectures for Multifaceted Clean Energy Applications. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1413392.

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Qiao, Yu. Understanding Energy Absorption Behaviors of Nanoporous Materials. Fort Belvoir, VA: Defense Technical Information Center, May 2008. http://dx.doi.org/10.21236/ada513572.

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Costanzo, Francesco. Model-Based Simulations to Engineer Nanoporous Thin Films. Fort Belvoir, VA: Defense Technical Information Center, December 2004. http://dx.doi.org/10.21236/ada438559.

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