Inclusion Chemistry in Periodic Mesoporous Hosts PDF Download
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Author: Parveen Kumar
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Book Description
Ordered mesoporous films and membranes refer to materials in a thin layer geometry possessing pore diameters in the 2-50 nm range. Their extremely high surface areas (up to ~ 1000 m2/g) and precise tuning of pore sizes are among the many desirable properties that have made such thin films and membranes a focus of great attention for emerging applications in the synthesis of nanomaterials and separation membranes. Ordered mesoporous silica films are highly promising hosts to grow semiconductor nanoparticles with fine-tuned size if the film thickness, pore size and orientation can be controlled. This important potential use of ordered mesoporous silica materials is one major focus area of this dissertation. Ordered mesoporous silica thin films can also be grown as membrane layers on poroussupports possessing three-dimensionally interconnected pore structures. The investigation of ordered mesoporous silica membranes modified by amine groups for CO2 separation is another major focus area of this work. Potential application of these membranes is to capture CO2 from flue gas which is a critical step preceding a variety of CO2 sequestration approaches to curb its atmospheric emissions. We systematically investigated the effect of pore size and pore symmetry on the growth of CdS nanoparticles inside the functionalized ordered mesoporous silica hosts. The 2D hexagonal mesoporous silica, SBA-15 possessing 4-22 nm pores and 3D cubic SBA-16 with 5 nm pores was employed to investigate the effect of pore size and pore symmetry on the microstructure of resulting CdS nanoparticles. As the pore size of SBA-15 increased, an increase in the average size of the CdS nanocrystals was observed. The pore size distributions of the CdS/SBA-15 and CdS/SBA-16 composites suggested that CdS nanoparticles nucleated primarily in the micropores of SBA-15 and SBA-16 hosts. Furthermore, SBA-16 possessing smaller pores as compared to SBA-15 resulted in larger crystal sizes of CdS nanoparticles. These results provided new important insights into the mechanism of initial growth of CdS nanoparticles inside the pores of mesoporous silica hosts possessing different pore symmetries. Ordered mesoporous MCM-48 membranes possessing a cubic pore structure were prepared by solution growth method on -alumina supports. The surfactant was removed by calcination and Soxhlet extraction. The best quality membranes were obtained when the surfactant was removed by extraction. The membranes prepared on asymmetric - alumina supports displayed higher gas permeance (N2 permeance> 2x 10-7 mol/m2.s. Pa) than those fabricated on symmetric supports (N2 permeance
Author: Parveen Kumar
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
Get Book Here
Book Description
Ordered mesoporous films and membranes refer to materials in a thin layer geometry possessing pore diameters in the 2-50 nm range. Their extremely high surface areas (up to ~ 1000 m2/g) and precise tuning of pore sizes are among the many desirable properties that have made such thin films and membranes a focus of great attention for emerging applications in the synthesis of nanomaterials and separation membranes. Ordered mesoporous silica films are highly promising hosts to grow semiconductor nanoparticles with fine-tuned size if the film thickness, pore size and orientation can be controlled. This important potential use of ordered mesoporous silica materials is one major focus area of this dissertation. Ordered mesoporous silica thin films can also be grown as membrane layers on poroussupports possessing three-dimensionally interconnected pore structures. The investigation of ordered mesoporous silica membranes modified by amine groups for CO2 separation is another major focus area of this work. Potential application of these membranes is to capture CO2 from flue gas which is a critical step preceding a variety of CO2 sequestration approaches to curb its atmospheric emissions. We systematically investigated the effect of pore size and pore symmetry on the growth of CdS nanoparticles inside the functionalized ordered mesoporous silica hosts. The 2D hexagonal mesoporous silica, SBA-15 possessing 4-22 nm pores and 3D cubic SBA-16 with 5 nm pores was employed to investigate the effect of pore size and pore symmetry on the microstructure of resulting CdS nanoparticles. As the pore size of SBA-15 increased, an increase in the average size of the CdS nanocrystals was observed. The pore size distributions of the CdS/SBA-15 and CdS/SBA-16 composites suggested that CdS nanoparticles nucleated primarily in the micropores of SBA-15 and SBA-16 hosts. Furthermore, SBA-16 possessing smaller pores as compared to SBA-15 resulted in larger crystal sizes of CdS nanoparticles. These results provided new important insights into the mechanism of initial growth of CdS nanoparticles inside the pores of mesoporous silica hosts possessing different pore symmetries. Ordered mesoporous MCM-48 membranes possessing a cubic pore structure were prepared by solution growth method on -alumina supports. The surfactant was removed by calcination and Soxhlet extraction. The best quality membranes were obtained when the surfactant was removed by extraction. The membranes prepared on asymmetric - alumina supports displayed higher gas permeance (N2 permeance> 2x 10-7 mol/m2.s. Pa) than those fabricated on symmetric supports (N2 permeance
Author: Peidong Yang
Publisher: World Scientific
ISBN: 9789812385659
Category : Science
Languages : en
Pages : 400
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Book Description
This book is a sequel to the first volume of The Chemistry.of Nanostructured Materials. It covers the most exciting developments in the nanostructured materials field for the past five to ten years, with a particular.focus on their applications in energy conversion and energy storage. Prominent authors of recognized authority in the field contribute their expertise in the review chapters. --Book Jacket.
Author: Geoffrey A Ozin
Publisher: Royal Society of Chemistry
ISBN: 1849737398
Category : Technology & Engineering
Languages : en
Pages : 875
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Book Description
International interest in nanoscience research has flourished in recent years, as it becomes an integral part in the development of future technologies. The diverse, interdisciplinary nature of nanoscience means effective communication between disciplines is pivotal in the successful utilization of the science. Nanochemistry: A Chemical Approach to Nanomaterials is the first textbook for teaching nanochemistry and adopts an interdisciplinary and comprehensive approach to the subject. It presents a basic chemical strategy for making nanomaterials and describes some of the principles of materials self-assembly over 'all' scales. It demonstrates how nanometre and micrometre scale building blocks (with a wide range of shapes, compositions and surface functionalities) can be coerced through chemistry to organize spontaneously into unprecedented structures, which can serve as tailored functional materials. Suggestions of new ways to tackle research problems and speculations on how to think about assembling the future of nanotechnology are given. Primarily designed for teaching, this book will appeal to graduate and advanced undergraduate students. It is well illustrated with graphical representations of the structure and form of nanomaterials and contains problem sets as well as other pedagogical features such as further reading, case studies and a comprehensive bibliography.
Author: Jonathan P. Blitz
Publisher: Springer Science & Business Media
ISBN: 140204741X
Category : Science
Languages : en
Pages : 459
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Book Description
This volume holds a special niche in describing the current state of the art in the fundamentals and applications of a variety of nanomaterials. A common theme throughout much of this volume involves adsorption and interfacial behavior of nanomaterials. The book provides a useful mixture of reviews and primary research from leading laboratories and offers a unique blend of East European and Western contributors.
Author:
Publisher: Academic Press
ISBN: 0123743966
Category : Science
Languages : en
Pages : 2785
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Book Description
From the Introduction: Nanotechnology and its underpinning sciences are progressing with unprecedented rapidity. With technical advances in a variety of nanoscale fabrication and manipulation technologies, the whole topical area is maturing into a vibrant field that is generating new scientific research and a burgeoning range of commercial applications, with an annual market already at the trillion dollar threshold. The means of fabricating and controlling matter on the nanoscale afford striking and unprecedented opportunities to exploit a variety of exotic phenomena such as quantum, nanophotonic and nanoelectromechanical effects. Moreover, researchers are elucidating new perspectives on the electronic and optical properties of matter because of the way that nanoscale materials bridge the disparate theories describing molecules and bulk matter. Surface phenomena also gain a greatly increased significance; even the well-known link between chemical reactivity and surface-to-volume ratio becomes a major determinant of physical properties, when it operates over nanoscale dimensions. Against this background, this comprehensive work is designed to address the need for a dynamic, authoritative and readily accessible source of information, capturing the full breadth of the subject. Its six volumes, covering a broad spectrum of disciplines including material sciences, chemistry, physics and life sciences, have been written and edited by an outstanding team of international experts. Addressing an extensive, cross-disciplinary audience, each chapter aims to cover key developments in a scholarly, readable and critical style, providing an indispensible first point of entry to the literature for scientists and technologists from interdisciplinary fields. The work focuses on the major classes of nanomaterials in terms of their synthesis, structure and applications, reviewing nanomaterials and their respective technologies in well-structured and comprehensive articles with extensive cross-references. It has been a constant surprise and delight to have found, amongst the rapidly escalating number who work in nanoscience and technology, so many highly esteemed authors willing to contribute. Sharing our anticipation of a major addition to the literature, they have also captured the excitement of the field itself in each carefully crafted chapter. Along with our painstaking and meticulous volume editors, full credit for the success of this enterprise must go to these individuals, together with our thanks for (largely) adhering to the given deadlines. Lastly, we record our sincere thanks and appreciation for the skills and professionalism of the numerous Elsevier staff who have been involved in this project, notably Fiona Geraghty, Megan Palmer and Greg Harris, and especially Donna De Weerd-Wilson who has steered it through from its inception. We have greatly enjoyed working with them all, as we have with each other.
Author: Abderrazzak Douhal
Publisher: Elsevier
ISBN: 0128178140
Category : Science
Languages : en
Pages : 464
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Book Description
Chemistry of Silica and Zeolite-Based Materials covers a wide range of topics related to silica-based materials from design and synthesis to applications in different fields of science and technology. Since silica is transparent and inert to the light, it is a very attractive host material for constructing artificial photosynthesis systems. As an earth-abundant oxide, silica is an ideal and basic material for application of various oxides, and the science and technology of silica-based materials are fundamentally important for understanding other oxide-based materials. The book examines nanosolvation and confined molecules in silica hosts, catalysis and photocatalysis, photonics, photosensors, photovoltaics, energy, environmental sciences, drug delivery, and health. Written by a highly experienced and internationally renowned team from around the world, Chemistry of Silica and Zeolite-Based Materials is ideal for chemists, materials scientists, chemical engineers, physicists, biologists, biomedical sciences, environmental scientists, toxicologists, and pharma scientists. --- "The enormous versatility of silica for building a large variety of materials with unique properties has been very well illustrated in this book.... The reader will be exposed to numerous potential applications of these materials – from photocatalytic, optical and electronic applications, to chemical reactivity in confined spaces and biological applications. This book is of clear interest not only to PhD students and postdocs, but also to researchers in this field seeking an understanding of the possible applications of meso and microporous silica-derived materials." - Professor Avelino Corma, Institute of Chemical Technology (ITQ-CSIC) and Polytechnical University of Valencia, Spain Discusses the most important advances in various fields using silica materials, including nanosolvation and confined molecules in silica hosts, catalysis and photocatalysis, and other topics Written by a global team of experts from a variety of science and technology disciplines Ideal resource for chemists, materials scientists, and chemical engineers working with oxide-based materials
Author: Feng-Shou Xiao
Publisher: Springer
ISBN: 366247395X
Category : Science
Languages : en
Pages : 490
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Book Description
This book is devoted to the new development of zeolitic catalysts with an emphasis on new strategies for the preparation of zeolites, novel techniques for their characterization and emerging applications of zeolites as catalysts for sustainable chemistry, especially in the fields of energy, biomass conversion and environmental protection. Over the years, energy and the environment have become the most important global issues, while zeolitic catalysts play important roles in addressing them. With individual chapters written by leading experts, this book offers an essential reference work for researchers and professionals in both academia and industry. Feng-Shou Xiao is a Professor at the Department of Chemistry, Zhejiang University, China. Xiangju Meng is an Associate Professor at the Department of Chemistry, Zhejiang University, China.
Author: Eric G. Derouane
Publisher: John Wiley & Sons
ISBN: 9780470094204
Category : Science
Languages : en
Pages : 258
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Book Description
This series offers practical help for advanced undergraduate, graduate and postgraduate students, as well as experienced chemists in industry and academia working with catalysts in organic and organometallic synthesis. It features tested and validated procedures, authoritative reviews on classes of catalysts, and assessments of all types of catalysts. Micro- and Mesoporous Solid Catalysts describes the use of zeolites and mesoporous solids as catalysts for the production of fine and specialty chemicals. Specific tips and hints are provided and some typical procedures are described in detail In addition to discussing the pros and cons, several major organic transformations are examined including aromatic substitutions, heterocyclic ring formation, amines synthesis, oligomerisation, oxidation and hydroxylation, and other regioselective and stereoselective reactions Features tutorial introductory chapters, including tips and hints for achieving successful organic transformations Important reactions are featured together with recommendations to resolve potential problems.
Author: Paolo Samorì
Publisher: John Wiley & Sons
ISBN: 3527689915
Category : Technology & Engineering
Languages : en
Pages : 1332
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Book Description
A comprehensive overview of functional nanosystems based on organic and polymeric materials and their impact on current and future research and technology in the highly interdisciplinary field of materials science. As such, this handbook covers synthesis and fabrication methods, as well as properties and characterization of supramolecular architectures. Much of the contents are devoted to existing and emerging applications, such as organic solar cells, transistors, diodes, nanowires and molecular switches. The result is an indispensable resource for materials scientists, organic chemists, molecular physicists and electrochemists looking for a reliable reference on this hot topic.
Author: G Q Max Lu
Publisher: World Scientific
ISBN: 178326179X
Category : Technology & Engineering
Languages : en
Pages : 911
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Book Description
Porous materials are of scientific and technological importance because of the presence of voids of controllable dimensions at the atomic, molecular, and nanometer scales, enabling them to discriminate and interact with molecules and clusters. Interestingly the big deal about this class of materials is about the “nothingness” within — the pore space. International Union of Pure and Applied Chemistry (IUPAC) classifies porous materials into three categories — micropores of less than 2 nm in diameter, mesopores between 2 and 50 nm, and macropores of greater than 50 nm. In this book, nanoporous materials are defined as those porous materials with pore diameters less than 100 nm.Over the last decade, there has been an ever increasing interest and research effort in the synthesis, characterization, functionalization, molecular modeling and design of nanoporous materials. The main challenges in research include the fundamental understanding of structure-property relations and tailor-design of nanostructures for specific properties and applications. Research efforts in this field have been driven by the rapid growing emerging applications such as biosensor, drug delivery, gas separation, energy storage and fuel cell technology, nanocatalysis and photonics. These applications offer exciting new opportunities for scientists to develop new strategies and techniques for the synthesis and applications of these materials.This book provides a series of systematic reviews of the recent developments in nanoporous materials. It covers the following topics: (1) synthesis, processing, characterization and property evaluation; (2) functionalization by physical and/or chemical treatments; (3) experimental and computational studies on fundamental properties, such as catalytic effects, transport and adsorption, molecular sieving and biosorption; (4) applications, including photonic devices, catalysis, environmental pollution control, biological molecules separation and isolation, sensors, membranes, hydrogen and energy storage, etc./a
