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Author: Nazar Ileri
Publisher:
ISBN: 9781124508849
Category :
Languages : en
Pages :
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Book Description
Nanoporous devices are up-and-coming platforms for selective molecule separation and sensing. They have great potential for high throughput and economy in manufacturing and operation. Acting as mass transfer diodes similar, tapered pores are proven to have superior performance characteristics compared to traditional cylindrical pores. Nevertheless, such phenomena remain to be exploited for molecular separation. In this thesis, we present fabrication, characterization, modeling, and performance results of thin silicon based sieves created by interferometric lithography, an approach which is ideally suited for the integration of nano-structured materials into microfluidic processing systems. Millimeter sized planar arrays of uniformly cylindrical and pyramidal nanopores are created in silicon nitride and silicon respectively with pore diameter/side length 200 nm or smaller. Molecular transport properties of the fabricated devices are investigated by molecular dynamics simulations against state-of-the-art polycarbonate track etched (PCTE) membranes. Higher diffusion rates are achieved with thin pores among which the highest rates were for thin cylindrical pores. The best separation capability, on the other hand, is achieved with pyramidal pores in presence of electrostatics. Increasing the pore size and decreasing the molecule size increased the rates and fluxes and decreased the pore clogging probability in general. The least possibility of fouling is achieved with pyramidal pores having molecular transport from small to large square. For the pore/protein ratio
Author: Nazar Ileri
Publisher:
ISBN: 9781124508849
Category :
Languages : en
Pages :
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Book Description
Nanoporous devices are up-and-coming platforms for selective molecule separation and sensing. They have great potential for high throughput and economy in manufacturing and operation. Acting as mass transfer diodes similar, tapered pores are proven to have superior performance characteristics compared to traditional cylindrical pores. Nevertheless, such phenomena remain to be exploited for molecular separation. In this thesis, we present fabrication, characterization, modeling, and performance results of thin silicon based sieves created by interferometric lithography, an approach which is ideally suited for the integration of nano-structured materials into microfluidic processing systems. Millimeter sized planar arrays of uniformly cylindrical and pyramidal nanopores are created in silicon nitride and silicon respectively with pore diameter/side length 200 nm or smaller. Molecular transport properties of the fabricated devices are investigated by molecular dynamics simulations against state-of-the-art polycarbonate track etched (PCTE) membranes. Higher diffusion rates are achieved with thin pores among which the highest rates were for thin cylindrical pores. The best separation capability, on the other hand, is achieved with pyramidal pores in presence of electrostatics. Increasing the pore size and decreasing the molecule size increased the rates and fluxes and decreased the pore clogging probability in general. The least possibility of fouling is achieved with pyramidal pores having molecular transport from small to large square. For the pore/protein ratio
Author: Taekyung Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Book Description
Author: Nick Kanellopoulos
Publisher: CRC Press
ISBN: 9781138076556
Category :
Languages : en
Pages : 578
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Book Description
Having successfully replaced elements used in traditional, pollution-prone, energy-consuming separation processes, nanoporous materials play an important role in chemical processing. Although their unique structural or surface physicochemical properties can, to an extent, be tailored to meet specific process-related requirements, the task of characterizing them completely is still a difficult and frequently controversial problem. Nanoporous Materials: Advanced Techniques for Characterization, Modeling, and Processing outlines existing and expected innovations in the combination of characterization and modeling techniques used to distinguish, monitor, and control the evolution of properties in nanoporous sorbents, catalysts, and membranes during their synthesis and utilization in several important energy processes. Providing broad coverage of the subject to make it useful for academic and industrial researchers from different disciplines and backgrounds, this book: Presents the basic principles and major applications of key characterization techniques--from diffraction and spectroscopy to calorimetry and permeability Explores computer simulation techniques, an indispensable complement to the combination of the aforementioned analytical techniques Covers the fundamentals and the recent advances in sorption, membrane, and catalyst processes Describes two characteristic case studies on emerging areas of application of porous solids in the fields of gas-to-liquid conversion and hydrogen storage This reference takes a detailed approach to the subject, starting with basics, so that beginners or non-expert readers can learn and apply presented fundamentals and examples to their work. Organized into well-focused sections written by internationally known experts, this book includes case studies, end-of-chapter problems, and illustrative video presentations of basic principles.
Author: Dusan Losic
Publisher: Springer
ISBN: 3319203347
Category : Technology & Engineering
Languages : en
Pages : 371
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Book Description
This book gives detailed information about the fabrication, properties and applications of nanoporous alumina. Nanoporous anodic alumina prepared by low-cost, simple and scalable electrochemical anodization process due to its unique structure and properties have attracted several thousand publications across many disciplines including nanotechnology, materials science, engineering, optics, electronics and medicine. The book incorporates several themes starting from the understanding fundamental principles of the formation nanopores and theoretical models of the pore growth. The book then focuses on describing soft and hard modification techniques for surface and structural modification of pore structures to tailor specific sensing, transport and optical properties of nano porous alumina required for diverse applications. These broad applications including optical biosensing, electrochemical DNA biosensing, molecular separation, optofluidics and drug delivery are reviewed in separated book chapters. The book appeals to researchers, industry professionals and high-level students.
Author: Daniel Frank Hanks
Publisher:
ISBN:
Category :
Languages : en
Pages : 123
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Book Description
Heat dissipation is a critical limitation in a range of electronic devices including microprocessors, solar cells, laser diodes and power amplifiers. The most demanding devices require dissipation of heat fluxes in excess of 1 kW/cm2 with heat transfer coefficients more than 30 W/cm 2K. Advanced thermal management solutions using phase change heat transfer are the most promising approach to address these challenges, yet current solutions are limited due to the combination of heat flux, thermal resistance, size and flow stability. This thesis reports the design, fabrication and experimental characterization for an evaporation device with a nanoporous membrane for high heat flux dissipation. Evaporation in the thin film regime is achieved using nanopores with reduced liquid film thicknesses while liquid pumping is enhanced using the capillary pressure of the 120 nm pores. The membrane is mechanically supported by ridges that form liquid supply channels and also serve as a heat conduction path to the evaporating meniscus at the surface of the membrane. The combination of high capillarity pores with high permeability channels facilitates theoretical critical heat fluxes over 2 kW/cm2 and heat transfer coefficients over 100 W/cm2K. Proof-of-concept devices were fabricated using a two-wafer stack consisting of a bonded silicon-on-insulator (SOI) wafer to a silicon wafer. Pores with diameters 110 - 130 nm were defined with interference lithography and etched in the SOI. Liquid supply microchannels were etched on a silicon wafer and the two wafers were fusion bonded together to form a monolithic evaporator. Once bonded, the membrane was released by etching through the backside of the SOI. Finally, platinum heaters and Resistive Temperature Detectors (RTDs) were deposited by e-beam evaporation and liftoff to heat the sample and measure the device temperature during experiments, respectively. Samples were experimentally characterized in a custom environmental chamber for comparison to the model using R245fa, methanol, pentane, water and isopropyl alcohol as working fluids. A comparison of the results with different working fluids demonstrates that transport at the liquid-vapor interface is the dominant thermal resistance in the system, suggesting a figure of merit: ... The highest heat flux recorded was with pentane at ... and the highest heat transfer coefficient recorded was with ... not including the substrate resistance. However, the samples were observed to clog with soluble, nonvolatile contaminants which limited operation to several minutes. The clogging behavior was captured in a mass diffusion model and a new configuration was suggested which is resistant to clogging. Evaporation from nanopores represents a new paradigm in phase change cooling with a figure of merit that favors high volatility, low surface tension fluids rather than water. The models and experimental results validate the functionality and understanding of the proposed approach and provide recommendations for enhancements in performance and understanding as well as strategies for resistance to clogging. This work demonstrates that nanoporous membranes have the potential for ultra-high heat flux dissipation to address next generation thermal management needs.
Author:
Publisher: Elsevier
ISBN: 1782422358
Category : Technology & Engineering
Languages : en
Pages : 555
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Book Description
Nano-scale materials have unique electronic, optical, and chemical properties which make them attractive for a new generation of devices. Part one of Modeling, Characterization, and Production of Nanomaterials: Electronics, Photonics and Energy Applications covers modeling techniques incorporating quantum mechanical effects to simulate nanomaterials and devices, such as multiscale modeling and density functional theory. Part two describes the characterization of nanomaterials using diffraction techniques and Raman spectroscopy. Part three looks at the structure and properties of nanomaterials, including their optical properties and atomic behaviour. Part four explores nanofabrication and nanodevices, including the growth of graphene, GaN-based nanorod heterostructures and colloidal quantum dots for applications in nanophotonics and metallic nanoparticles for catalysis applications. Comprehensive coverage of the close connection between modeling and experimental methods for studying a wide range of nanomaterials and nanostructures Focus on practical applications and industry needs, supported by a solid outlining of theoretical background Draws on the expertise of leading researchers in the field of nanomaterials from around the world
Author: Gyorgy Szekely
Publisher: Elsevier
ISBN: 0128146826
Category : Technology & Engineering
Languages : en
Pages : 476
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Book Description
Sustainable Nanoscale Engineering: From Materials Design to Chemical Processing presents the latest on the design of nanoscale materials and their applications in sustainable chemical production processes. The newest achievements of materials science, in particular nanomaterials, opened new opportunities for chemical engineers to design more efficient, safe, compact and environmentally benign processes. These materials include metal-organic frameworks, graphene, membranes, imprinted polymers, polymers of intrinsic microporosity, nanoparticles, and nanofilms, to name a few. Topics discussed include gas separation, CO2 sequestration, continuous processes, waste valorization, catalytic processes, bioengineering, pharmaceutical manufacturing, supercritical CO2 technology, sustainable energy, molecular imprinting, graphene, nature inspired chemical engineering, desalination, and more. - Describes new, efficient and environmentally accepted processes for nanomaterials design - Includes a large array of materials, such as metal-organic frameworks, graphene, imprinted polymers, and more - Explores the contribution of these materials in the development of sustainable chemical processes
Author: Nandita Dasgupta
Publisher: Springer Nature
ISBN: 3030730107
Category : Technology & Engineering
Languages : en
Pages : 370
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Book Description
This book presents comprehensive reviews on the latest developments of nanotechnologies to detect and remove pollutants in water, air and food. Polymer nanocomposites, nanoparticles from microbes and the application of nanotechnologies for desalination and agriculture are also discussed. Pollution of water and air by contaminants and diseases is a major health issue leading globally to millions of deaths yearly according to the World Health Organization. Such issue requires advanced methods to clean environmental media.
Author: Gongping Liu
Publisher: John Wiley & Sons
ISBN: 3527348484
Category : Technology & Engineering
Languages : en
Pages : 404
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Book Description
Two-Dimensional-Materials-Based Membranes An authoritative and up to date discussion of two-dimensional materials and membranes In Two-Dimensional-Materials-Based Membranes: Preparation, Characterization, and Applications, a team of distinguished chemical engineers delivers a comprehensive exploration of the latest advances in design principles, synthesis approaches, and applications of two-dimensional (2D) materials—like graphene, metal-organic frameworks (MOFs), 2D layered double hydroxides, and MXene—and highlights the significance and development of these membranes. In the book, the authors discuss the use of membranes to achieve high-efficiency separation and to address the challenges posed in the field. The book also discusses potential challenges and benefits in the future development of advanced 2D nanostructures, as well as their impending implementation in applications in the fields of energy, sustainability, catalysis, electronics, and biotechnology. Readers will also find: A thorough introduction to fabrication methods for 2D-materials-based membranes, including the synthesis of nanosheets, membrane structures, and fabrication methods Descriptions of three types of 2D-materials-based membranes: single-layer membranes, laminar membranes and mixed-matrix membranes Comprehensive discussions of 2D-materials-based membranes for water and ions separation, solvent-water separation and gas separation Explorations of transport mechanism of 2D-materials-based membranes for molecular separations Perfect for membrane scientists, inorganic chemists, and materials scientists, Two-Dimensional-Materials-Based Membranes will also earn a place in the libraries of chemical and process engineers in industrial environments.
Author: Klaus-Viktor Peinemann
Publisher: John Wiley & Sons
ISBN: 9783527631414
Category : Technology & Engineering
Languages : en
Pages : 251
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Book Description
This ready reference on Membrane Technologies for Water Treatment, is an invaluable source detailing sustainable, emerging processes, to provide clean, energy saving and cost effective alternatives to conventional processes. The editors are internationally renowned leaders in the field, who have put together a first-class team of authors from academia and industry to present a highly approach to the subject. The book is an instrumental tool for Process Engineers, Chemical Engineers, Process Control Technicians, Water Chemists, Environmental Chemists, Materials Scientists and Patent Lawyers.
