Aligned Carbon Nanotubes As Porous Materials For Selective Gas Adsorption
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Aligned Carbon Nanotubes As Porous Materials For Selective Gas Adsorption
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Author : Mahshid Rahimi
language : en
Publisher:
Release Date : 2016
Aligned Carbon Nanotubes As Porous Materials For Selective Gas Adsorption written by Mahshid Rahimi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Gas Adsorption Studies On Vertically Aligned Carbon Nanotubes
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Author : Deepu Joseph Babu
language : en
Publisher:
Release Date : 2016
Gas Adsorption Studies On Vertically Aligned Carbon Nanotubes written by Deepu Joseph Babu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Aligned Carbon Nanotubes
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Author : Zhifeng Ren
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-09-05
Aligned Carbon Nanotubes written by Zhifeng Ren and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-05 with Science categories.
This book gives a survey of the physics and fabrication of carbon nanotubes and their applications in optics, electronics, chemistry and biotechnology. It focuses on the structural characterization of various carbon nanotubes, fabrication of vertically or parallel aligned carbon nanotubes on substrates or in composites, physical properties for their alignment, and applications of aligned carbon nanotubes in field emission, optical antennas, light transmission, solar cells, chemical devices, bio-devices, and many others. Major fabrication methods are illustrated in detail, particularly the most widely used PECVD growth technique on which various device integration schemes are based, followed by applications such as electrical interconnects, nanodiodes, optical antennas, and nanocoax solar cells, whereas current limitations and challenges are also be discussed to lay the foundation for future developments.
Hierarchical Carbon Structures With Vertically Aligned Nanotube Carpets For Oil Water Separation Under Different Conditions
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Author : Kimia Kiaei
language : en
Publisher:
Release Date : 2019
Hierarchical Carbon Structures With Vertically Aligned Nanotube Carpets For Oil Water Separation Under Different Conditions written by Kimia Kiaei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Carbon nanotubes categories.
The primary purpose of this study is to investigate the role of surface nano-structuring in fluid separation. It is hypothesized that hierarchical carbon structures consisting of aligned carbon nanotube arrays strongly adhered to the surface of porous carbon solids such as fabric and foam, can be used for separation of polar and non-polar fluids by selective wettability of one fluid and rejection of another. The vertically-aligned carbon nanotube arrays,as synthesized, possess super hydrophobicity demonstrated by high water contact angle on their surfaces. On the other hand, they are incredibly oleophilic, showing a high affinity to adsorb oil. These properties make it possible for the carbon nanotube arrays to adsorb and reject certain liquids based on their polarity selectively. By investigating the wettability of these hierarchical structures with water and variety of model oils, initially in the presence of air, and later in the presence of each other, we demonstrate that selective capillary-based devices are thermodynamically possible under different conditions. We have measured the sorption capacity of the model oils in this study, and we have shown the increase in sorption capacity by the specific surface area. We have also shown that adsorption in multiple cycles does not decrease the sorption capacity for these structures, and therefore, they have the potential to be used multiple times without losing their efficiency. Finally, we investigated the selective wettability and separation phenomena of oil-water mixtures, with and without surfactants. These studies show the capabilities and practical limitations of these porous hierarchical structures in the separation of oil from water. We suggest that porosity control of the substrates and controlling the direction of the liquid flow could be an essential part of the future studies for making these structures more effective membranes.
Carbon Nanomaterials For Gas Adsorption
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Author : Maria Letizia Terranova
language : en
Publisher: CRC Press
Release Date : 2012-11-27
Carbon Nanomaterials For Gas Adsorption written by Maria Letizia Terranova and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-27 with Technology & Engineering categories.
Research in adsorption of gases by carbon nanomaterials has experienced considerable growth in recent years, with increasing interest for practical applications. Many research groups are now producing or using such materials for gas adsorption, storage, purification, and sensing. This book provides a selected overview of some of the most interesting scientific results regarding the outstanding properties of carbon nanomaterials for gas adsorption and of interest both for basic research and technological applications. Topics receiving special attention in this book include storage of H, purification of H, storage of rare gases, adsorption of organic vapors, gas trapping and separation, and metrology of gas adsorption.
Hierarchical Porous Structures With Aligned Carbon Nanotubes As Efficient Adsorbents And Metal Catalyst Supports
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Author : Hema Vijwani
language : en
Publisher:
Release Date : 2015
Hierarchical Porous Structures With Aligned Carbon Nanotubes As Efficient Adsorbents And Metal Catalyst Supports written by Hema Vijwani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Carbon nanotubes categories.
The overall goal of this study is two-fold: synthesis of multiscale nanostructures by growing aligned carbon nanotubes on porous foam substrates and investigation of their applicability as adsorbents and catalyst supports for environmental remediation applications. High purity, vertically-aligned arrays of carbon nanotubes (CNT) are grown on open-cell interconnected porous carbon foams by pre-activating them with an oxide buffer layer followed by chemical vapor deposition (CVD). This type of hierarchical morphology provides the capability of increasing surface area by several orders of magnitude, while tuning its morphology for targeted applications. Analytical models are also proposed in this study for specific surface area calculations, those agree well with the experimental measurements. These hierarchical carbon materials are seen to be powerful adsorbents of aqueous pollutants such as methylene blue dye. Their monolayer adsorption capacities correlate very well with the total CNT surface area determined from analytical models and with BET measurements, indicating full utilization of the nanotube surfaces. The hierarchical structures can also serve as base supports for attachment of metal nanoparticle catalysts. The catalysts investigated in this study are metallic palladium (Pd), oxidized palladium (PdO), and silver-palladium (Ag-Pd) nanoparticles combination. These are suitable for a variety of industrial applications such as hydrocarbon conversion, hydrogen storage, fuel cell electrodes and pollutant degradation. The current architecture allows synthesis of highly active catalyst structures utilizing very small quantities of precious metal that make the catalyst component significantly lighter and more compact than conventional systems. Detailed characterization of structure and surface chemical states of these nano-catalysts have been performed and their catalytic activities are tested by measuring the degradation kinetics of organic contaminants via bench-scale experiments. Catalytic degradation of atrazine, an emerging problematic contaminant, was quantified using high-performance liquid chromatography. Among Pd, PdO, and Ag-Pd nanoparticles, PdO in the presence of hydrogen was seen to provide the most rapid reaction rate. These nanocatalysts also enable rapid degradation of chlorinated hydrocarbons such as trichloroethylene and trichloroethane quantified using head-space gas chromatography, with PdO providing the fastest kinetic route. Durability tests indicated that the nano-particles and nanotubes are robust, and remain attached to the base support after long periods of rapid rotation in water. These results imply that such materials can provide compact and powerful surface active materials in future applications such as adsorbents, catalysts, porous electrodes, and energy storage devices.
Characterization Of Nanoporous Materials Using Gas Adsorption Isotherms
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Author : Vaiva Krungleviciute
language : en
Publisher:
Release Date : 2009
Characterization Of Nanoporous Materials Using Gas Adsorption Isotherms written by Vaiva Krungleviciute and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
In order to find/design porous materials that could be used in practical applications involving adsorption, it is important to investigate the basic properties (i.e. isosteric heat, specific surface area, binding energy, pore size, pore volume, etc.) of each material. With this aim in mind we have looked at three different types of materials: single-walled carbon nanotubes (prepared by the HiPco and laser methods), single-walled nanohorns (dahlia-like and bud-like) and metal-organic frameworks (Cu-BTC and RPM-1). For these substrates we have measured volumetric adsorption isotherms using several gases such as neon, argon, tetrafluoromethane (CF 4 ), xenon, and methane (not all gases for all substrates). Experimental adsorption isotherms were measured using methane, argon, xenon, and neon gases on unpurified single-walled carbon nanotubes prepared by the HiPco method. The main idea behind these experiments was to investigate, using different size gas molecules, the sites available for adsorption on this type of porous material.
Nanoporous Materials
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Author : Nick Kanellopoulos
language : en
Publisher: CRC Press
Release Date : 2016-04-19
Nanoporous Materials written by Nick Kanellopoulos and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-19 with Science categories.
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 charac
Selective Growth Of Carbon Nanotubes And Oxide Nanowires
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Author : Nitin Chopra
language : en
Publisher:
Release Date : 2005
Selective Growth Of Carbon Nanotubes And Oxide Nanowires written by Nitin Chopra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Materials For Carbon Capture
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Author : De-en Jiang
language : en
Publisher: John Wiley & Sons
Release Date : 2020-02-25
Materials For Carbon Capture written by De-en Jiang and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-02-25 with Science categories.
Covers a wide range of advanced materials and technologies for CO2 capture As a frontier research area, carbon capture has been a major driving force behind many materials technologies. This book highlights the current state-of-the-art in materials for carbon capture, providing a comprehensive understanding of separations ranging from solid sorbents to liquid sorbents and membranes. Filled with diverse and unconventional topics throughout, it seeks to inspire students, as well as experts, to go beyond the novel materials highlighted and develop new materials with enhanced separations properties. Edited by leading authorities in the field, Materials for Carbon Capture offers in-depth chapters covering: CO2 Capture and Separation of Metal-Organic Frameworks; Porous Carbon Materials: Designed Synthesis and CO2 Capture; Porous Aromatic Frameworks for Carbon Dioxide Capture; and Virtual Screening of Materials for Carbon Capture. Other chapters look at Ultrathin Membranes for Gas Separation; Polymeric Membranes; Carbon Membranes for CO2 Separation; and Composite Materials for Carbon Captures. The book finishes with sections on Poly(amidoamine) Dendrimers for Carbon Capture and Ionic Liquids for Chemisorption of CO2 and Ionic Liquid-Based Membranes. A comprehensive overview and survey of the present status of materials and technologies for carbon capture Covers materials synthesis, gas separations, membrane fabrication, and CO2 removal to highlight recent progress in the materials and chemistry aspects of carbon capture Allows the reader to better understand the challenges and opportunities in carbon capture Edited by leading experts working on materials and membranes for carbon separation and capture Materials for Carbon Capture is an excellent book for advanced students of chemistry, materials science, chemical and energy engineering, and early career scientists who are interested in carbon capture. It will also be of great benefit to researchers in academia, national labs, research institutes, and industry working in the field of gas separations and carbon capture.