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Relevant bibliographies by topics / Nanotechnology, alumni

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Academic literature on the topic 'Nanotechnology, alumni'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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Journal articles on the topic "Nanotechnology, alumni"

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Kim, Hyehee, Sen Gao, Myung Gwan Hahm, Chi Won Ahn, Hyun Young Jung, and Yung Joon Jung. "Graphitic Nanocup Architectures for Advanced Nanotechnology Applications." Nanomaterials 10, no. 9 (2020): 1862. http://dx.doi.org/10.3390/nano10091862.

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The synthesis of controllable hollow graphitic architectures can engender revolutionary changes in nanotechnology. Here, we present the synthesis, processing, and possible applications of low aspect ratio hollow graphitic nanoscale architectures that can be precisely engineered into morphologies of (1) continuous carbon nanocups, (2) branched carbon nanocups, and (3) carbon nanotubes–carbon nanocups hybrid films. These complex graphitic nanocup-architectures could be fabricated by using a highly designed short anodized alumina oxide nanochannels, followed by a thermal chemical vapor deposition of carbon. The highly porous film of nanocups is mechanically flexible, highly conductive, and optically transparent, making the film attractive for various applications such as multifunctional and high-performance electrodes for energy storage devices, nanoscale containers for nanogram quantities of materials, and nanometrology.

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Virk, Hardev Singh. "Heavy Ion Tracks Route to Nanotechnology." Advanced Materials Research 67 (April 2009): 115–20. http://dx.doi.org/10.4028/www.scientific.net/amr.67.115.

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Heavy ion tracks recorded in dielectric materials were found to have a width of 5-10 nm using SEM. Heavy ion beams were used for irradiation of Polymers and Muscovite mica to create Ion Track Filters (ITFs) using UNILAC facility at Darmstadt, Germany. The electrochemically etched pores of ITFs used would act as a template. The simple principle of electroplating is used to create heterostructures. The rate of deposition of metallic film depends upon current density, inter-electrode distance, cell voltage, electrolyte concentration and temperature etc. The use of ITFs looks quite promising in the fabrication of micro and nanostructures. The morphology of such structures produced through electrochemical methods and replicas of etched tracks in ITFs have been investigated in detail. The efficacy of the technique was tested for growth of quantum dots, fibers, cones, whiskers, micro and nano wires. A 3-dimensional ensemble of Cu-Se was grown electrochemically using ITF of Makrofol-KG. Replication of etched pores in ITFs has been used to develop microtubules. Presently, we are engaged to develop quantum dots, nanorods and nanowires of copper, iron and bismuth using Anodic Alumina Membranes (AAM), Polycarbonate ITFs and Reverse Micelle technique. The preliminary results of our investigations will be presented at NADPA-2008.

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Taha, Mohd Raihan. "Recent Developments in Nanomaterials for Geotechnical and Geoenvironmental Engineering." MATEC Web of Conferences 149 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201814902004.

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Nanotechnology has provided enormous benefits to the industrial and developed world. Most fields of knowledge have been tapping, using, and applying the advantages of nanotechnology to improve systems and living standards. This cannot be said for civil engineering and construction particularly geotechnical engineering. Actually, soil mechanics have been involved with nano scale dimensions and materials for a very long time, i.e. before the term nanotechnology and nanomaterials were coined. From the basic clay structure and the water molecules which give rise to soil plasticity/cohesiveness, geotechnical engineers were exposed to these phenomena since the early days of the subject. Currently, developments in nanotechnology and nanomaterials in geotechnical engineering has been limited to its use as an improvement and clean-up materials. Recent results have shown that the use of a small amount of nanomaterials (<1% of dry weight of the original soil) have resulted in significant change and improvement in soil properties. This is important since efficient use of materials is one of the facets of sustainability related to prolonging the life of our depleting natural resources. Experiences with nano-soil, nano-clay, nano-silica, nano-alumina, nano-magnesium, carbon nanotube and nanofibers, and nano-lime will all be discussed with respect to its use in soil improvement and soil remediation.

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Svarovskaya, Natalia, Elena Glazkova, Olga Bakina, Sergey Kazantsev, Aleksandr Lozhkomoev та Marat Lerner. "Hierarchical γ-alumina: From Pure Phase to Nanocomposites". Recent Patents on Nanotechnology 14, № 2 (2020): 92–101. http://dx.doi.org/10.2174/1872210514666191213150838.

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Recent advances in nanotechnology make it possible to create nanomaterials based on γ-alumina with novel hierarchical structure and physicochemical properties. Hierarchical &#947;-alumina can be synthesized using chemical or physical methods. The nanostructures based on &#947;-alumina exhibit unique properties, which are utilized in the design of efficient applications. These superior properties are often due to their hierarchical organizations from the nanosize scale to the macroscopic level. The present review is devoted to the contemporary state of the studies on the methods to produce hierarchical &#947;-alumina. We tried to summarize herein the literature data on the methods of synthesis of hierarchical &#947;-AlOOH and &#947;-Al2O3 with controlled morphology and the application of these methods for the synthesis of hierarchical &#947;-AlOOH and &#947;-Al2O3 nanocomposites.

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Myatiev, A. A., A. V. Goziyan, E. S. Lukin, D. S. Prokhorenkov, and A. L. Pomadchik. "Analysis for potential possibilities of nanotechnology for obtaining competitive alumina ceramics." Russian Journal of Non-Ferrous Metals 54, no. 6 (2013): 532–36. http://dx.doi.org/10.3103/s1067821213060175.

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Basily, Iskander K., Amira L. Shafik, Ali A. Sarhan, and Mona B. Mohamed. "Nanotechnology Role for the Production of Clean Fuel E-85 and Petrochemical Raw Materials." Journal of Nanotechnology 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/439531.

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There have been a number of substantive technical changes that can be described as revolutionary process and evolutionary process. One of these approaches is the use of nanotechnology in the two-stage pyrolysis of petroleum residues of the heavy distillates separated from the Arabian crude oil. Two-stage catalytic pyrolysis technique proved to be an excellent method for the production of unsaturated hydrocarbons (which easily can be converted to alcohol, by addition of H2O, for the production of E-85, i.e., clean fuel) regardless the type of feed stocks used. Basically, the catalysts are arranged into three large groups; amorphous and crystalline alumino-silicates, alkaline or alkaline earth alumino compounds, and different metal oxides on different catalyst carriers such as Zeolites. The high yield of ethylene (30–40%) brought by different catalysts at temperatures of 700–750°C appear to justify the intensive research work in this field.

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Abdallah, Reham M., and Neven S. Aref. "Development of Newly Formulated Nanoalumina-/Alkasite-Based Restorative Material." International Journal of Dentistry 2021 (July 26, 2021): 1–6. http://dx.doi.org/10.1155/2021/9944909.

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Purpose. Nanotechnology offers considerable scope in dentistry to improve dental treatment, care, and prevention of oral diseases through the use of nanosized biomaterials. This study assessed the effect of incorporating alumina nanoparticles (Al2O3 NPa) to the recently introduced alkasite-based restorative material (Cention N) on its mechanical properties and surface topographical features. Materials and Methods. Alumina nanopowder was incorporated into the powder component of Cention N at 5 and 10% (w/w). The unblended powder was used as a control. Compressive strength was assessed using a universal testing machine. Surface microhardness and roughness were evaluated using the Vickers microhardness test and surface profilometer, respectively. Surface topography was inspected using a scanning electron microscope (SEM). Data were analyzed by ANOVA and Tukey’s test ( P < 0.05 ). Results. Incorporation of either 5 or 10% (w/w) Al2O3 NPa into alkasite-based restorative materials (Cention N) increased both its compressive strength and surface microhardness. This increase was significant with the use of lower concentration Al2O3 NPa (5% w/w). Meanwhile, there was an increase in surface roughness values of Cention N modified with either 5 or 10% (w/w) Al2O3 NPa. This increase was only significant in the case of 10% (w/w) Al2O3 NPa. Conclusion. Incorporation of 5% (w/w) Al2O3 NPa into the newly introduced alkasite-based restorative material (Cention N) seems to produce a promising restorative material with high compressive strength and surface hardness without adversely affecting its surface roughness properties. Thus, nanotechnology implementation into Cention N restorative material may be strongly helpful for a diversity of clinical applications.

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Berdova, Maria, Alexander Pyymaki Perros, Wonjae Kim, et al. "Corrigendum: Exceptionally strong and robust millimeterscale graphene–alumina composite (2014 Nanotechnology 25 355701)." Nanotechnology 25, no. 43 (2014): 439501. http://dx.doi.org/10.1088/0957-4484/25/43/439501.

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Che Sidik, Nor Azwadi, Lee Yoke Keen, and Alireza Fazeli. "Computational Investigation of Heat Transfer of Nanofluids in Domestic Water Heat Exchanger." Applied Mechanics and Materials 695 (November 2014): 423–27. http://dx.doi.org/10.4028/www.scientific.net/amm.695.423.

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Recent development of nanotechnology led to the concept of using suspended nanoparticles in the heat transfer fluids to improve the heat transfer properties of the base fluids. The heat transfer enhancement by nanofluids is the significant concerns in the efficiency of domestic water heat exchanger system. A computational investigation of the heat transfer in a domestic water heat exchanger is conducted on the water and water-based nanofluids. Copper (Cu) nanoparticle and Alumina (Al2O3) nanoparticle are selected in the water-based nanofluids. Volume fraction of nanoparticle in the nanofluids is set at 0.5 %, 1.0 %, 1.5 %, 2.0 %, 2.5 %, and 3.0 %. Heat exchanger has been invented for the heat transfer from one medium to another medium in many heat transfer systems. Domestic water heat exchanger can be used in a heat pump domestic water heating system. The density, the thermal conductivity, and the dynamic viscosity of the water base fluid are increased while the specific heat capacity of the water base fluid is reduced with the addition of copper as well as alumina nanoparticle. Addition of copper nanoparticle into the water-based heat transfer fluid significantly increases the domestic hot water temperature. The efficiency of domestic water heat exchanger system is optimum when 1.5 % copper or alumina nanoparticle is added into the water-based heat transfer fluid.

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Kushwaha, M. K., Anjan Sil, and S. Ray. "Carbon Nanotube/Nanofiber Embedded Nanoporous Anodized Aluminium Oxide Surface and Its Tribological Properties." Journal of Nanoscience and Nanotechnology 8, no. 8 (2008): 4152–58. http://dx.doi.org/10.1166/jnn.2008.an01.

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Nanoporous alumina has been prepared by anodization of pure aluminium using phosphoric acid electrolyte. Carbon nanotubes/nanofibres (CNTs/CNFs) are grown within the pores by chemical vapour deposition technique, using acetylene gas as carbon precursor. Such synthesis of nanostructured carbonaceous materials within the nanoporous oxide template has high potential for many applications (e.g., electronics, magnetic, etc.) in nanotechnology. Possibility of using such material combination for engineering systems where abrasion resistance coupled with self-lubrication (at comparatively higher loads) are the key requirements, has been explored through the present work. Pore structure has been characterized by SEM/FE-SEM in this study and CNTs/CNFs have been examined by TEM, FE-SEM and Raman spectroscopy. While the pore diameters are found to lie in the range of 180–220 nm, the CNTs/CNFs diameter are observed to be in the range of 50 to 220 nm. The CNTs/CNFs growing from bottom of the pores are found to replicate the pore diameter, while those grown above the surface are varying significantly in diameter and probably matching the diameter of the catalyst, which remains adsorbed on the top surface and inner walls of the pores. On comparing friction and wear properties of both materials (viz. anodized alumina and CNTs/CNFs embedded anodized alumina) as determined by pin-on–disc machine using hardened steel disc as counterface, it is found that wear rate and coefficient of friction of CNTs embedded composite surface is significantly lower which is attributed to formation of transfer layer of hard wear resistant alumina mechanically mixed with graphitic CNTs/CNFs.

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Dissertations / Theses on the topic "Nanotechnology, alumni"

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Steinebach, Mario, Katharina Thehos, Florentina Liefeith, and Ina Huke. "TU-Spektrum 1/2013, Magazin der Technischen Universität Chemnitz." Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-126421.

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Macháčková, Marina. "Nanotechnologie v konstrukci senzorů pro detekci vodíku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217866.

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Aligned arrays of nanostructures has recently attracted great interest because of their unique properties and potential use in a broad range of technological applications. The nanostructures can be employed when it is essential to create large surface on a small area in electronic device as sensor technology or energetics e.g. solar panels. One of the simplest and low-cost methods of fabricating nanostructures is template-assisted electrochemical deposition. This method also enables good control over the nanostructure dimensions and can be used to deposit a wide range of materials. The proposed method consists of two steps. At first, a non-conductive nanoporous template has to be created and then nanostructures are formed by electrodeposition into the template which is coated with a metal on one of its sides or placed on a metal surface.

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Filho, Ricardo Wilson Nastari Denigres. "Síntese e evolução térmica de boemitas com diversas morfologias." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-23082016-084343/.

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Óxidos e hidróxidos de alumínio vêm sendo alvo de estudos no Laboratório de Matérias-Primas Particuladas Prof. Pérsio de Souza Santos (LPSS) nas últimas seis décadas. Várias rotas de síntese de mono- e tri-hidróxidos foram pesquisadas, bem como as transformações térmicas desses materiais em aluminas de transição e alumina-alfa. Mais recentemente, a síntese de boemita a partir do tratamento hidrotérmico de gibsita vem sendo o principal objeto dos estudos realizados no LPSS. Nesta Tese, a síntese hidrotérmica de boemita a partir de uma gibsita Bayer comercial foi estudada. Os cristais produzidos foram caracterizados por difração de raios X (DRX), por análises térmicas (TGA e DTA) e por microscopia eletrônica de varredura (MEV). Diferentes morfologias de cristais de boemita foram obtidas - cristais com dimensionalidade \"3D\" (cubos e paralelepípedos), \"2D\" (placas espessas, placas finas e placas alongadas) e \"1D\" (placas alongadas e ripas) por meio da variação da composição do meio reacional inicial. Reações conduzidas em meios com pH característico de suspensões de gibsita em água (pH alcalino) resultaram em cristais com morfologia \"3D\" ou \"2D espessa\", enquanto reações conduzidas em meio acidificado (pH = 2,0) resultaram em cristais com morfologia \"2D\". Reações conduzidas em meios acidificados contendo íon acetato levaram a cristais com morfologia \"2D fina e alongada\" ou morfologia \"1D\", dependendo da relação molar [Al : acetato] inicial de íon acetato (morfologia \"1D\" necessita de uma relação molar de no mínimo 1mol Al : 1mol acetato). Os cristais com morfologia \"1D\" e \"2D fina\" apresentaram espessuras nanométricas. A evolução térmica dos cristais de boemita produzidos foi estudada após aquecimentos entre 200ºC e 1200ºC. Todas as boemitas seguiram as transformações térmicas da chamada \"série ?\" , independentemente da sua morfologia, ou seja: boemita -> alumina-? -> alumina-? / alumina-? -> alumina-?. A temperatura de transformação da boemita em alumina-? é afetada pela morfologia dos cristais, ocorrendo em temperaturas mais baixas nos materiais com cristais de espessura nanométrica (morfologias \"1D\" e \"2D fina\"). Alumina-? com diferentes morfologias e diferentes áreas específicas (determinadas pelo método BET aplicado a isotermas de adsorção de nitrogênio gasoso a 77K) foram obtidas: 136 m2/g para alumina-? \"1D\"; 73,4 m2/g para alumina-? \"2D fina e alongada\"; 40,3 m2/g para alumina-? \"3D\". Foi possível, portanto, obter aluminas de transição potencialmente interessantes para aplicações industriais dadas as elevadas áreas específicas observadas.<br>Aluminum oxides and hydroxides have been the subject of studies in Laboratório de Matérias-Primas Particuladas Prof. Pérsio de Souza Santos (LPSS) in the last six decades. Several synthesis routes for mono- and tri-hydroxides were investigated as well as the thermal processing of these materials into transition aluminas and alpha-alumina. More recently, the synthesis of boehmite from the hydrothermal treatment of gibbsite has been the main object of studies in LPSS. In this Thesis, the hydrothermal synthesis of boehmite from a commercial Bayer gibbsite was studied. The crystals produced were characterized by X-ray diffraction (XRD), thermal analysis (TGA and DTA) and scanning electron microscopy (SEM). Different boehmite crystal morphologies were obtained - crystals \"3D\" (cubes and parallelepipeds), \"2D\" (thick plates, thin and elongated plates) and \"1D\" (elongated plates and strips) by varying the composition the initial reaction medium. Reactions conducted in media with characteristic pH of gibbsite suspension in water (alkaline pH) resulted in crystals with morphologies \"3D\" or \"thick 2D\" while reactions carried out in acidic medium (pH = 2.0) resulted in crystals with morphology \"2D\". Reactions carried out in acidic media containing acetate ion led to crystals with a \"thin and elongated 2D\" morphology or \"1D\" morphology, depending on the pristine [Al: acetate]. molar ratio (\"1D\" morphology requires a pristine molar ratio of at least 1mol Al: 1mol acetate). Crystals with \"1D\" or \"2D thin\" morphologies presented nanometric thickness. The thermal evolution of boehmite crystals produced was studied after heating between 200oC and 1200oC. All boehmites following thermal \"?-series\" transformation, regardless of their morphology, that is: boehmite -> ?-alumina -> ?-alumina /?-alumina -> ?-alumina. The transformation temperature of boehmite into ?-alumina is affected by crystal morphology, occurring at lower temperatures in the materials with nanometer thick crystals (\"1D\" and \"2D thin\" morphologies). ?-alumina with different morphologies and different specific surface areas (determined by BET method applied to adsorption isotherms of gaseous nitrogen at 77K) were obtained: 136 m2/g for ?-alumina \"1D\"; 73.4 m2/g for ?-alumina \"thin and elongated 2D\"; 40.3 m2/g for ?-alumina \"3D\". It was therefore possible to obtain transition aluminas potentially interesting for industrial applications given the high specific surface areas observed.

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Tanriverdi, Senem. "Production Of Alumina Borosilicate Ceramic Nanofibers By Using Electrospinning Technique And Its Characterization." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607378/index.pdf.

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Today, ceramic, polymer, and composite nanofibers are among the most charming materials for nanotechnology. Because of their small characteristic dimension, high surface area, and microstructural features, they provide unique mechanical, optical, electronic, magnetic, and chemical properties for an extensive variety of materials applications. Electrospinning provides an effective way of the nanofiber production in a nanometer scale. This technique utilizes a high voltage DC to create a strong electric field and a certain charge density in a viscous solution contained in a pipette. As a result, fibers with diameters ranging from the micrometer to nanometer are formed from this charged solution. This study deals with, the fabrication of alumina borosilicate ceramic nanofibers using electrospinning technique. Alumina borosilicates contain important components having intriguing characteristics for many applications and have been widely studied with different compositions. In this study, alumina borosilicate/PVA solution was prepared using the conventional sol-gel method. Polyvinyl alcohol (PVA) was added into this solution to increase the viscosity for electrospinning. After the alumina borosilicate/PVA solution was electrospun into fibers, high temperature sintering was carried to obtain ceramic alumina borosilicate fibers. The products were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), Fourier transform-infrared spectroscopy (FT-IR), and thermogravimetric/differential thermal analysis (TG-DTA) techniques.

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Garcia, Uanderson Mezavila. "Síntese de membranas de alumina anódica porosa sobre substratos metálicos obtidos por evaporação térmica." Universidade Federal de São Carlos, 2017. https://repositorio.ufscar.br/handle/ufscar/9004.

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Submitted by Milena Rubi (milenarubi@ufscar.br) on 2017-08-16T17:29:07Z No. of bitstreams: 1 GARCIA_Uanderson_2017.pdf: 25453924 bytes, checksum: 4c34f46362e91f9eb2f88106f805d7f3 (MD5)<br>Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-08-16T17:29:17Z (GMT) No. of bitstreams: 1 GARCIA_Uanderson_2017.pdf: 25453924 bytes, checksum: 4c34f46362e91f9eb2f88106f805d7f3 (MD5)<br>Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-08-16T17:29:23Z (GMT) No. of bitstreams: 1 GARCIA_Uanderson_2017.pdf: 25453924 bytes, checksum: 4c34f46362e91f9eb2f88106f805d7f3 (MD5)<br>Made available in DSpace on 2017-08-16T17:29:30Z (GMT). No. of bitstreams: 1 GARCIA_Uanderson_2017.pdf: 25453924 bytes, checksum: 4c34f46362e91f9eb2f88106f805d7f3 (MD5) Previous issue date: 2017-03-14<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>This work covers the investigation and synthesis of nanometric structures of Porous Anodic Alumina PAA, produced from low purity substrates, in aim to obtain selfsustained membranes. The Hard Anodization (HA) and Mild Anodization (MA) processes were used under special conditions through those found in literature. The analyses of results were based in comparing the AAP produced under the same conditions except the applied potential that was different depending on the MA or HA. HA process had its time halved in order to investigate the oxide growth rate and to calibrate the conditions of anodized membrane synthesis over the glass samples. This work also covers the construction of a resistive thermal evaporation PVD system capable of evaporating metals with melting points below 800°C. Through the deposition of successive layers it was possible to obtain metallic films of aluminum with thicknesses above 10 µm, enabling conditions of synthesis of porous anodic alumina on substrates produced by thermal resistive evaporation. The result of membrane synthesis on low purity aluminum substrates was complement to the synthesis of membranes obtained in aluminum evaporated in glass substrates, since the thickness of each deposited film is low if compared to the thickness of the AAP layer. Therefore, it was necessary to make several Al depositions on the same samples, to obtain an aluminum film that was able to support an oxide layer of anodic alumina and with the same characteristics of those obtained by the process of MA. All anodized samples were characterized by scanning electron microscopy, including samples made from metalized aluminum. The micrography obtained from the low purity aluminum membranes were treated by ImageJ software allowing the morphological analysis. AAP membranes obtained from technical Al substrate depicted the formation of branched pore channels, a result of instabilities in applied electric field during Anodization and presence of different alloying elements in the Al substrate. The metalized aluminum film had a larger thickness in the samples positioned in the middle of the sample holder possibly due to different temperature gradients of filament depending on the position of Al pellets.<br>Este trabalho aborda a síntese e investigação de estruturas nanométricas de Alumina Anódica Porosa AAP produzidas a partir de substratos de baixa pureza, com a finalidade da obtenção de membranas auto-suportadas. Foram utilizados os processos de Hard Anodization (HA) e Mild Anodization (MA). Para efeito comparativo entre os processos foram mantidas todas as condições variando apenas o potencial aplicado. Posteriormente para HA o tempo experimental foi reduzido pela metade a fim de investigar a velocidade no crescimento do óxido e condições de anodização de membranas sobre as amostras de vidro. Este trabalho também abrange a construção de um sistema Phisical Vapor Deposition (PVD) por evaporação térmica resistiva, capaz de evaporar metais com pontos de fusão abaixo de 800°C. Através da deposição de sucessivas camadas foi possível a obtenção de filmes metálicos de Alumínio com espessuras acima de 10 µm, possibilitando condições de síntese de alumina anódica porosa sobre substratos produzidos por evaporação térmica resistiva. O resultado da síntese de membranas em substratos de Al de baixa pureza foi complementar à síntese das membranas obtidas em alumínio evaporado em substratos de vidro, pois a espessura de cada filme depositado é baixa se comparados a espessura da camada de AAP. Portanto, houve a necessidade de várias deposições sobre as mesmas amostras, para se obter o filme de alumínio que fosse capaz de suportar uma camada de alumina anódica porosa resistente e que se aproximasse das características das obtidas pelo processo de MA. Todas as amostras anodizadas foram caracterizadas por microscopia eletrônica de varredura, inclusive as amostras produzidas a partir do alumínio metalizado. As micrografias obtidas a partir das membranas de alumínio de baixa pureza foram tratadas pelo software ImageJ, possibilitando a análise morfológica das mesmas. As membranas de AAP de baixa pureza possuem poros com ramificações transversais, são provocadas pelos desvios do campo elétrico aplicado, além da possibilidade de formação de outros tipos de óxidos. O filme de alumínio metalizado teve maior espessura nas amostras posicionadas na parte central do porta amostra, isso pode estar relacionado com o aquecimento do filamento que ocorre da região central para as extremidades.<br>2010/10813-0

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Rocha, Gisele de Araujo. "Síntese e caracterização de hidróxidos de alumínio com duas dimensões nanométricas (morfologia fibrilar) ou com uma dimensão nanométrica (morfologia de placas/lâminas)." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-26062014-160610/.

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A síntese de nanopartículas com morfologia controlada vem sendo objeto de interesse crescente no campo da Ciência dos Materiais. Devido a essa motivação, o principal objetivo desse trabalho foi a síntese e caracterização de pseudoboemita e boemita apresentando uma ou duas dimensões nanométricas. O método de síntese utilizado para a obtenção de pseudoboemita fibrilar é baseado na reação de um alcóxido de alumínio, em solução aquosa de ácido acético. Para a preparação de boemita, um único método de síntese, a síntese hidrotérmica, foi utilizado, com o emprego de três precursores: uma pseudoboemita, um sal orgânico (o monohidróxido diacetato de alumínio) e o trihidróxido de alumínio gibsita, este último em duas formas: uma gibsita comercial e uma gibsita sintetizada que utiliza iodo como ativador. As pseudoboemitas e as boemitas obtidas foram caracterizadas por difração de raios-X e microscopia eletrônica de varredura. Algumas amostras de pseudoboemita e de boemita foram caracterizadas por análise térmica diferencial e por espectroscopia vibracional na região do infravermelho. Foram obtidas pseudoboemitas com morfologia fibrilar (partículas anisométricas alongadas); no caso das boemitas foram produzidas distintas morfologias (de acordo com o precursor e com as condições de síntese empregadas em sua obtenção): fibrilar (duas dimensões em escala nanométrica), nanoplacas (uma dimensão em escala nanométrica) e partículas com simetria cúbica (nenhuma dimensão em escala nanométrica). A presença do íon acetato na síntese hidrotérmica foi determinante na formação de boemita com morfologia de placas.<br>The synthesis of nanoparticles with controlled morphology is of increasing interests in the field of Materials Science. Due to this motivation, the main objective was the synthesis and characterization of boehmite pseudoboehmite presenting one or two nanoscale dimensions. The method of synthesis used to obtain fibrillar pseudoboehmite is based on the reaction of an aluminum alkoxide in aqueous acetic acid. For the preparation of boehmite, a single synthesis method, the hydrothermal synthesis, was used with three different precursors: a pseudoboehmite, an organic salt (aluminum monohydroxide diacetate) and the aluminum trihydroxide gibbsite, the latter in two forms: a commercial gibbsite and a gibbsite synthesized that utilizes iodine as activator. The pseudoboehmites and boehmites obtained were characterized by X-ray diffraction and scanning electron microscopy. Some samples of pseudoboehmite and boehmite were characterized by differential thermal analysis and by vibrational spectroscopy in the infrared region. Pseudoboehmites were obtained with fibrillar morphology (anisometric elongated particles); for boehmites, different morphologies were produced (according to the precursor and the synthesis conditions employed in their production): fibrillar (two dimensions in nanoscale), nanoplates (one dimension in nanoscale) and particles with cubic symmetry (no dimensions in nanoscale). The presence of acetate ion in hydrothermal synthesis was instrumental in the formation of boehmite with plate morphology.

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Paula, Leonardo Barcelos de. "Efeitos da Nanoemulsão de Ftalocianina Cloro-Alumínio na Regulação da Via do Fator de Crescimento Epidermal em Glioblastoma e Meduloblastoma." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/17/17135/tde-22052015-155141/.

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O glioblastoma multiforme (GBM) pode desenvolver-se rapidamente sem evidências clínicas, radiológicas ou morfológicas de um tumor precursor menos maligno. Entretanto, um novo tumor pode desenvolver-se a partir de células gliais normais ou de suas precursoras, sendo chamado de GBM primário. Já meduloblastoma é um tumor embrionário maligno do cerebelo, cuja incidência ocorre preferencialmente em crianças de até 7 anos. Os tumores de cérebro se diferem entre si em nível molecular. A amplificação do gene EGFR (Receptor do Fator de Crescimento Epidermal) com consequente elevação da expressão do receptor de EGF (Fator de Crescimento Epidermal) é mais proeminente em GBM primário quando comparado com GBM secundário e está presente também em meduloblastoma. O presente trabalho consiste em investigar o perfil de expressão gênica da via EGF e o perfil proteico de genes supressores de tumor e oncogenes de linhagens de células tumorais de glioblastoma e meduloblastoma após o tratamento com terapia fotodinâmica (TFD). O conhecimento da ação da TFD em tumores cerebrais em nível molecular permitiu a detecção de genes que participam da regulação da expressão gênica de outras vias de sinalização como RTK/Ras/PI3-K e AKT/MAPK que são responsáveis pela proliferação celular aumentada, sobrevivência ou resistência a apoptos e perda de aderência e migração, podendo revelar alto grau de invasividade. Portanto, o tratamento com terapia fotodinâmica em células tumorais do cérebro acrescenta informações relevantes sobre o processo de proliferação celular e da biologia do câncer.<br>Glioblastoma multiforme (GBM) can develop quickly without clinical, radiological or morphological of a less malignant precursor tumor. However, a new tumor can grow from normal glial cells or their precursors, is called the primary GBM. Medulloblastoma is also a malignant embryonic tumor of the cerebellum, whose incidence occurs preferentially in children under 7 years. Brain tumors differ from between them at the molecular level. The amplification of the EGFR gene (Growth Factor Receptor Epidermal) with an increase in the expression of EGF receptor (Epidermal Growth Factor) is the main cause in primary GBM compared to secondary GBM and is also present in medulloblastoma. This work to investigate the gene expression profile of the EGF pathway and the protein profile of tumor suppressor genes and oncogenes tumor cell lines of glioblastoma and medulloblastoma after treatment with photodynamic therapy (PDT). PDT\'s share knowledge in brain tumors at the molecular level allowed to discovery of genes that participate in the regulation of gene expression of other RTK/Ras/PI3-K and AKT/MAPK signaling pathways such as that are responsible for the increased cell proliferation, survival or resistance to apoptosis and loss of adhesion and migration, and may reveal a high degree of invasiveness. For this reason, treatment with photodynamic therapy in brain tumor cells adds relevant information about the process of cellular proliferation and cancer biology.

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Stollberg, David Walter. "Nanoindentation of YSZ-alumina ceramic thin films grown by combustion chemical vapor deposition." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/43977.

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Combustion chemical vapor deposition (combustion CVD) is a thin film deposition process that uses a flame created by the ignition of an aerosol containing precursors dissolved in a flammable solvent. Combustion CVD is a relatively new technique for creating thin film oxide coatings. Combustion CVD has been successfully used to deposit high quality thin oxide films for potential applications such as thermal barrier coatings, dielectric thin films, composite interlayer coatings, etc. The present work involved developing the optimum parameters for deposition of thin films of yttria-stabilized zirconia (YSZ), alumina (Al₂O₃), and YSZ-alumina composites followed by a determination of the mechanical properties of the films (measured using nanoindentation) as a function of composition. The optimized parameters for deposition of YSZ, alumina, and YSZ-alumina composites onto single crystal a-plane alumina involved using an organic liquid as the flammable solvent and Y 2-ethylhexanoate, Zr 2-ethylhexanoate and Al acetylacetonate as the metal precursors at a 0.002 M concentration delivered at 4 ml/min at flame temperatures of 155 ℃ and substrate temperatures of 105 ℃. The resulting films were grown with deposition rates of ~ 1.5 μm/hr. Measurement of the mechanical properties (hardness, elastic modulus and fracture toughness) of the films was performed using a mechanical properties microprobe called the Nanoindenter®. In order to obtain valid results from nanoindentation, the combustion CVD films were optimized for minimum surface roughness and grown to a thickness of approximately 0.8 μm. With the penetration depth of the indenter at approximately 150 nm, the 800 nm thickness of the film made influences of the substrate on the measurements negligible. The hardnesses and elastic moduli of the YSZ-alumina films did not vary with the composition of the film. The fracture toughness, however, did show a dependence on the composition. It was found that second phase particles of alumina grown into a YSZ matrix increased the fracture toughness of the films (on average, 1.76 MPa• m⁰.⁵ for 100% YSZ to 2.49 MPa• m⁰.⁵ for 70 mol% YSZ/30 mol% alumina). Similarly, second phase particles of YSZ grown into an alumina matrix also increased the fracture toughness (on average, 2.20 MPa• m⁰.⁵ for 100% alumina to 2.45 MPa• m⁰.⁵ for 37.2 mol% YSZ/62.8 mol% alumina). Modeling of the fracture toughness of the YSZ-alumina films was successfully achieved by using the following toughening mechanisms: crack deflection from the second phase particles, grain bridging around the particles, and residual stress from the CTE mismatch between the film and the substrate and between the second phase particles and the matrix of the film.

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Gaudry, Mélanie. "Propriétés optiques d'agrégats mixtes de métaux de transition en matrice d'alumine : effets de taille et de composition." Lyon 1, 2002. http://tel.archives-ouvertes.fr/docs/00/04/49/06/PDF/tel-00001513.pdf.

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La réponse optique des petites particules de métaux nobles (Au, Ag, Cu) se manifeste essentiellement par une bande de résonance plasmon de surface dont la position et la largeur dépendent notamment de la taille des agrégats et du milieu environnant. Ce travail présente l'étude des propriétés optiques d'agrégats mixtes AuM (M=Ag, Ni, Co et Pt) de 1,5 à 6 nm de diamètre, en matrice d'alumine. La technique de préparation des films minces de nanoparticules en matrice d'alumine ainsi que les différentes techniques de caractérisation et d'étude de leurs propriétés optiques sont présentées d'abord. Puis les modèles théoriques qui permettent d'interprèter ces propriétés sont introduits : un modèle semiquantique, mettent en évidence l'influence des électrons de coeur, de la matrice et de sa porosité, mais qui n'est pas adapté à tous les systèmes; un modèle classique dans les autres cas. L'influence de la taille et de la composition des agrégats mixtes or-argent est étudiée ensuite. Les spectres d'absorption montrent une résonance plasmon de surface intermédiaire par rapport à l'argent et l'or purs, et le blue-shift odservé quand la taille diminue est d'autant plus important que la proportion d'or est grande. Ces résultats expérimentaux sont comparés avec ceux d'un calcul semi-quantique, en utilisant deux modèles pour la fonction dialectique du mélange AuAg. Il semble que ces agrégats forment plutôt des alliages. Enfin, les systèmes NiAg et CoAg forment des "core-shell" : un coeur de nickel ou de cobalt, entouré d'argent et leurs spectres d'absorption présentent une bande plasmon de surface conformément aux prévisions théoriques classiques. A l'inverse, les agrégats (PtxAg1-x)n présentent expérimentalement une résonnance plasmon de surface très fortement atténuée, contrairement aux prévisions classiques si l'agrégat est sous forme "core-shell" ou a une structure pour laquelle la fonction diélectique dépend simplement de celles de se constituants.

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Nadimpally, Bhavananda R. "Copper Indium Diselenide Nanowire Arrays in Alumina Membranes Deposited on Molybdenum and Other Back Contact Substrates." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/28.

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Heterojunctions of CuInSe2 (CIS) nanowires with cadmium sulfide (CdS) were fabricated demonstrating for the first time, vertically aligned nanowires of CIS in the conventional Mo/CIS/CdS stack. These devices were studied for their material and electrical characteristics to provide a better understanding of the transport phenomena governing the operation of heterojunctions involving CIS nanowires. Removal of several key bottlenecks was crucial in achieving this. For example, it was found that to fabricate alumina membranes on molybdenum substrates, a thin interlayer of tungsten had to be inserted. A qualitative model was proposed to explain the difficulty in fabricating anodized aluminum oxide (AAO) membranes directly on Mo. Experimental results were used to corroborate this model. Subsequently, a general procedure to use any material that can be deposited using sputtering or evaporation as a back contact for nanowires grown using AAO templates was developed. Experimental work to demonstrate this by transferring thin AAO templates onto flexible Polyimide (PI) substrates was performed. This pattern transfer approach opens doors for a wide variety of applications on almost any substrate. Any material that can be deposited by physical means can then be used as a back contact. Electron-beam induced deposition using a liquid precursor (LP-EBID) was used to selectively grow preconceived patterns of compound semiconductor (CdS) nanoparticles. Stoichiometric CdS nanoparticle patterns were grown successfully using this method. They were structurally and optically characterized indicating high purity deposits. This approach is promising because it marries the precision of e-beam lithography with the versatility of solution based deposition methods.

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Books on the topic "Nanotechnology, alumni"

1

Santos, Abel, and Dusan Losic. Nanoporous Alumina: Fabrication, Structure, Properties and Applications. Springer, 2016.

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Book chapters on the topic "Nanotechnology, alumni"

1

Lindqvist, Karin, Elis Carlström, Anna Nelvig, and Bengt Hagström. "Electrospinning of Alumina Nanofibers." In Progress in Nanotechnology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588246.ch35.

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Huang, Cheng-Liang, Jun-Jie Wang, and Chi-Yuen Huang. "Microwave Dielectric Properties of Sintered Alumina Using Nano-Scaled Powders of α Alumina and TiO2." In Progress in Nanotechnology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588260.ch22.

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Somani, Vikas, and Samar J. Kalita. "Synthesis, Characterization and Measurements of Electrical Properties of Alumina-Titania Nanocomposites." In Progress in Nanotechnology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588246.ch53.

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Hasan Zahir, Md, Koji Sato, Hiroshi Mori, Yuji Iwamoto, Mikihiro Nomura, and Shin-ichi Nakao. "Preparation and Properties of Hydrothermally Stable γ-Alumina-Based Composite Mesoporous Membranes." In Progress in Nanotechnology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588246.ch31.

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Won Kim, Sug, and Khalil Abdel-Razek Khalil. "High-Frequency Induction Heat Sintering of Mechanically Alloyed Alumina-Yttria-Stabilized Zirconia Nano-Bioceramics." In Progress in Nanotechnology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588260.ch11.

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Ahmad, A. L., M. R. Othman, and N. F. Idrus. "Synthesis and Characterization of Nano-Composite Alumina-Titania Ceramic Membrane for Gas 225 Separation." In Progress in Nanotechnology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588260.ch33.

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Bartolomé, José F., Antonio H. De Aza, Antonia Martín, et al. "Alumina/Zirconia Micro/Nanocomposites: A New Material for Biomedical Applications with Superior Sliding Wear Resistance." In Progress in Nanotechnology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588260.ch6.

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Rivera, Sergio, Luis A. Díaz, Adolfo Fernández, Ramón Torrecillas, and José S. Moya. "Reinforcement Mechanisms in Alumina Toughened Zirconia Nanocomposites with Different Stabilizing Agents." In Nanostructured Materials and Nanotechnology VII. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118807828.ch2.

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Wade, James, and Houzheng Wu. "Hardness of Alumina/Silicon Carbide Nanocomposites at Various Silicon Carbide Volume Percentages." In Nanostructured Materials and Nanotechnology VII. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118807828.ch11.

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Mahlambi, Mphilisi M., Ajay K. Mishra, Shivani B. Mishra, Rui W. Krause, Bhekie B. Mamba, and Ashok M. Raichur. "Synthesis and characterization of carbon-covered alumina (CCA) supported TiO2 nanocatalysts with enhanced visible light photodegradation of Rhodamine B." In Nanotechnology for Sustainable Development. Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-05041-6_7.

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Conference papers on the topic "Nanotechnology, alumni"

1

Voitov, I. A., O. V. Lastovetskaya, and V. A. Borisov. "Rational methods for processing of chromia-alumina catalyst." In NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122037.

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Khorasaninejad, Mohammadreza, and Simarjeet Singh Saini. "APDMS mediated self-assembly of alumina nanospheres." In 2010 International Conference on Nanoscience and Nanotechnology (ICONN). IEEE, 2010. http://dx.doi.org/10.1109/iconn.2010.6045261.

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Ramli, Zainab, Rozaina Saleh, Mohamad Rusop, and Tetsuo Soga. "The Effect of Synthesis Routes on the Development of Ordered Mesoporous Alumina by Precipitation Method." In NANOSCIENCE AND NANOTECHNOLOGY: International Conference on Nanoscience and Nanotechnology—2008. AIP, 2009. http://dx.doi.org/10.1063/1.3160146.

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Wu, Jeremy P., Ian W. M. Brown, Tim Kemmitt, and Mark E. Bowden. "Hierarchical anodic alumina template-assisted fabrication of nanowires." In 2010 International Conference on Nanoscience and Nanotechnology (ICONN). IEEE, 2010. http://dx.doi.org/10.1109/iconn.2010.6045163.

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Jani, Abdul Mutalib Md, Ivan M. Kempson, Dusan Losic, and Nicolas H. Voelcker. "Controlling the surface functionalities of nanoporous alumina membranes." In 2010 International Conference on Nanoscience and Nanotechnology (ICONN). IEEE, 2010. http://dx.doi.org/10.1109/iconn.2010.6045249.

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Hyunsook Kwon, Seungeun Lee, and O'Dae Kwon. "Fabrication of gold nanowires using self-organized porous alumina template." In 2006 IEEE Nanotechnology Materials and Devices Conference. IEEE, 2006. http://dx.doi.org/10.1109/nmdc.2006.4388789.

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Han Gao, Maria A. S. Chong, and Lee Kheng Tan. "Integration of highly ordered nanoporous anodic alumina templates on substrates for nanofabrication." In 7th IEEE International Conference on Nanotechnology. IEEE, 2007. http://dx.doi.org/10.1109/nano.2007.4601231.

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Xueyong Wei, Philip D. Prewett, and Kyle Jiang. "Electrochemical co-deposition of Nickel-Alumina Nanocomposite for Microsystem Applications." In 2007 7th IEEE Conference on Nanotechnology (IEEE-NANO). IEEE, 2007. http://dx.doi.org/10.1109/nano.2007.4601135.

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Garre, K., M. Cahay, P. B. Kosel, et al. "Self-assembled growth on flexible alumina and nanoporous silicon templates." In 2007 7th IEEE Conference on Nanotechnology (IEEE-NANO). IEEE, 2007. http://dx.doi.org/10.1109/nano.2007.4601404.

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Gentle, Angus, Abbas Maaroof, Geoff Smith, and Michael Cortie. "Optical properties and applications to production of plasmonic thin film nanostructures of self-ordered columnar alumina arrays on glass." In Microelectronics, MEMS, and Nanotechnology, edited by Derek Abbott, Yuri S. Kivshar, Halina H. Rubinsztein-Dunlop, and Shanhui Fan. SPIE, 2005. http://dx.doi.org/10.1117/12.638126.

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