Author: Burcin Irfanoglu
Publisher:
ISBN: 9781267308689
Category : Gases
Languages : en
Pages : 102
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Book Description
Abstract: Porous materials have been known since the 18th century in natural forms of inorganic structures known as zeolites and organic structures known as carbon. Applications of porous materials in a large range of industries have been widespread. During the last two decades, a novel porous material type has been designed which combines organic and inorganic features. Metal organic frameworks (MOFs) are highly porous crystals in which a metal ion or cluster combines with an unlimited variety of organic ligands. In this work, several metal organic frameworks have been synthesized and their promising applications as gas storage materials and potential as photocatalysts are discussed. First, we show a novel synthetic strategy to design three-ring based metal organic frameworks. Lowering ring sizes permits potentially larger pore volumes, but it is harder to synthesize because of possible ring strains. In this work, we selected the metal center as In +3 ion and used mixed dicarboxylic linkers with 120 and 180 degree angles between functional groups to synthesize a series of isostructural three-ring-based zeolite-type MOFs. In the second part of our studies, we achieved synthesis of new two-dimensional and three-dimensional frameworks with the usage of 4-sulfanylbenzoic acid (SBA) ligand as a linker. Up to date, the use of SBA as a linker has not been studied. Our studies showed the potential of SBA and related ligands as useful building blocks in the construction of MOFs.
Author: Stefan Kaskel
Publisher: John Wiley & Sons
ISBN: 3527693084
Category : Science
Languages : en
Pages : 904
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Book Description
Providing vital knowledge on the design and synthesis of specific metal-organic framework (MOF) classes as well as their properties, this ready reference summarizes the state of the art in chemistry. Divided into four parts, the first begins with a basic introduction to typical cluster units or coordination geometries and provides examples of recent and advanced MOF structures and applications typical for the respective class. Part II covers recent progress in linker chemistries, while special MOF classes and morphology design are described in Part III. The fourth part deals with advanced characterization techniques, such as NMR, in situ studies, and modelling. A final unique feature is the inclusion of data sheets of commercially available MOFs in the appendix, enabling experts and newcomers to the field to select the appropriate MOF for a desired application. A must-have reference for chemists, materials scientists, and engineers in academia and industry working in the field of catalysis, gas and water purification, energy storage, separation, and sensors.
Author: Jinhee Park
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Porous metal-organic materials (MOMs) are assembled through coordination between two types of building units, metal or metal-containing nodes and organic linkers. Metal-organic frameworks (MOFs) have 3-D infinite structures and are especially known for high porosity and enormous surface area, leading to diverse applications such as selective gas separation, gas storage and catalysis. In contrast, metal-organic polygons/polyhedra (MOPs) as discrete molecular coordination assemblies are soluble in certain solvents, allowing us to study their solution-chemistry. In the first project, a microporous MOF with 1-dimensional (1D) bridging helical chain secondary building units (SBUs) shows facile transition from micro- to mesoporosity upon activation conditions. The quickly activated MOF shows permanent microporosity while the slow removal of coordinated aqua ligand results in formation of the mesopores in the microporous MOF. Second, a strategy to introduce not only the functional groups but also functionalized meso-cavities into microporous MOFs through metal-ligand-fragment coassembly has been studied. With this functionalization, the interior of the MOFs can be tuned by a wide range of functional groups on the ligand fragments, including polar and ionic ones. Depending on the functional groups on the ligand fragments, the introduced cavities can be extended to mesopores in a controllable manner. Third, a MOF constructed from dicopper paddlewheels and a predesigned ligand bearing carboxylate, pyridine, and amide groups enables selective adsorption of CO2 over CH4 and high H2 adsorption. The cooperative catalytic activity in a tandem one-pot deacetalization-Knoevenagel condensation was demonstrated. In the fourth and fifth section, an optically and thermally switchable azobenzene was introduced into a MOF and MOPs, respectively. The freshly synthesized MOF adsorbed a significant amount of CO2. Upon light irradiation, the adsorbed gas molecules were squeezed out of the MOF due to the change of conformation of the azobenzene groups inside the pores. The adsorbent returned to its original state when allowed to stay with gentle heating. In addition, solubility of srMOPs was optically controlled by trans-cis isomerization of the azobenzene moieties. Interestingly, guest molecules were trapped during cis to trans isomerization and released in the trans to cis conversion. This srMOP can be applied to uses requiring stimuli responsive capture and release of guest molecules, such as in controlled drug delivery systems. Finally, an organic linker with multiple conformations was used to synthesize both single and core-shell molecular squares, whose formations were controlled by reaction temperatures. Intriguingly the core-shell structure assembly was successfully employed as a template to prepare a heterobimetallic assembly, in which the metal substitution occurred exclusively in the core. This work might pave the way for the exploration of enzyme-mimicking molecular catalysts. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149436
Author: Leonard R. MacGillivray
Publisher: John Wiley & Sons
ISBN: 1118931580
Category : Science
Languages : en
Pages : 1210
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Book Description
Metal-Organic Frameworks (MOFs) are crystalline compounds consisting of rigid organic molecules held together and organized by metal ions or clusters. Special interests in these materials arise from the fact that many are highly porous and can be used for storage of small molecules, for example H2 or CO2. Consequently, the materials are ideal candidates for a wide range of applications including gas storage, separation technologies and catalysis. Potential applications include the storage of hydrogen for fuel-cell cars, and the removal and storage of carbon dioxide in sustainable technical processes. MOFs offer the inorganic chemist and materials scientist a wide range of new synthetic possibilities and open the doors to new and exciting basic research. Metal-Organic Frameworks Materials provides a solid basis for the understanding of MOFs and insights into new inorganic materials structures and properties. The volume also reflects progress that has been made in recent years, presenting a wide range of new applications including state-of-the art developments in the promising technology for alternative fuels. The comprehensive volume investigates structures, symmetry, supramolecular chemistry, surface engineering, recognition, properties, and reactions. The content from this book will be added online to the Encyclopedia of Inorganic and Bioinorganic Chemistry: http://www.wileyonlinelibrary.com/ref/eibc
Author: Weilie Zhou
Publisher: Springer Science & Business Media
ISBN: 0387396209
Category : Technology & Engineering
Languages : en
Pages : 533
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Book Description
This book presents scanning electron microscopy (SEM) fundamentals and applications for nanotechnology. It includes integrated fabrication techniques using the SEM, such as e-beam and FIB, and it covers in-situ nanomanipulation of materials. The book is written by international experts from the top nano-research groups that specialize in nanomaterials characterization. The book will appeal to nanomaterials researchers, and to SEM development specialists.
Author: Wei Xia
Publisher: Springer
ISBN: 9811068119
Category : Technology & Engineering
Languages : en
Pages : 148
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Book Description
This thesis systematically introduces readers to a new metal-organic framework approach to fabricating nanostructured materials for electrochemical applications. Based on the metal-organic framework (MOF) approach, it also demonstrates the latest ideas on how to create optimal MOF and MOF-derived nanomaterials for electrochemical reactions under controlled conditions. The thesis offers a valuable resource for researchers who want to understand electrochemical reactions at nanoscale and optimize materials from rational design to achieve enhanced electrochemical performance. It also serves as a useful reference guide to fundamental research on advanced electrochemical energy storage materials and the synthesis of nanostructured materials.
Author: Guangshan Zhu
Publisher: Springer
ISBN: 3662454564
Category : Technology & Engineering
Languages : en
Pages : 135
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Book Description
This book describes the design, synthesis, characterization and applications of porous organic frameworks (POFs). Special emphasis is placed on the utilization of porous materials for CO2 capture and CH4 and H2 storage, which have promising potential for addressing the issues of environmental degradation and climate change. It also includes two chapters introducing the properties of POFs and defining the principles of synthesis, as well as a chapter dealing with post-modified POFs. This book is intended for those readers who are interested in porous materials and their applications. Guangshan Zhu is a professor at the College of Chemistry, Jilin University, China.
Author: Victoria Samanidou
Publisher: MDPI
ISBN: 303928486X
Category : Science
Languages : en
Pages : 198
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Book Description
Metal–organic frameworks are among the most promising novel materials. The concept of MOFs was first introduced in 1990. They were actually initially used in catalysis, gas separation, membranes, electrochemical sensors. Later on, they were introduced as SPE sorbents for PAHs (Polycyclic Aromatic Hydrocarbons) in environmental water samples, then the range expanded to the field of analytical chemistry, both in chromatographic separation and sample preparation, with great success in, e.g., SPE and SPME (Solid Phase Mico-extraction). Since then, the number of analytical applications implementing MOFs as sorbents in sorptive sample preparation approaches is increasing. Τhis is reinforced by the fact that, at least theoretically, an infinite number of structures can be designed and synthesized, thus making tuneability one of the most unique characteristics of MOF materials. Moreover, they have been designed in various shapes, such as columns, fibers, and films, so that they can meet more analytical challenges with improved analytical features.Their exceptional properties attracted the interest of analytical chemists who have taken advantage of the unique structures and properties and have already introduced them in several sample pretreatment techniques, such as solid phase extraction, dispersive SPE, magnetic solid phase extraction, solid phase microextraction, stir bar sorptive extraction, etc.
Author: Brandy Escobar (Graduate student)
Publisher:
ISBN:
Category : Crystalline polymers
Languages : en
Pages : 0
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Book Description
Abstract: Metal-organic frameworks (MOFs) have rapidly emerged as one of the favored crystalline porous materials (CPM) due to their compositional and geometric tunability leading to many possible applications, especially in gas storage and separation. Here, we sought to achieve efficient capture of small target molecules through a ligand insertion method to create new porous materials. Considering that the interactions between gas molecules and porous frameworks are usually not strong, it is ideal to increase the interaction between gas molecules and porous framework or to increase the density of gas binding sites by trapping gas molecules within small snug pockets or segments. Herein we have synthesized and characterized two new porous materials with different coordination chemistry and studied the adaptability of the less common, non-aromatic organic ligands and metal types within metal-organic frameworks. The first coordination network is constructed by a copper dimer, forming a copper paddlewheel that arranges into a pillar-layered structure. The second network is formed by nickel trimers creating an unusual MIL-88-type structure. Both MOFs involve the use of BCP (bicyclo[1.1.1]pentane1,3-dicarboxylic acid) as the primary ligand and DABCO as the secondary ligand. While the ligand combination is equivalent, new materials differ in their structural chemistry due to difference in metal cluster chemistry. The structures were determined from single-crystal X-ray diffraction and their thermal stability and gas sorption properties for CO2 and N2 have also been studied.
Author: Marie Helene Delville
Publisher: John Wiley & Sons
ISBN: 3527342559
Category : Technology & Engineering
Languages : en
Pages : 1010
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Book Description
Das erste Handbuch und gut zugängliche Referenzwerk zu diesem zunehmend wichtigen Thema erläutert in einem anwendungsorientierten Ansatz Synthese, Design, Charakterisierung und Simulation von Grenzflächen bei hybriden organisch-anorganischen Materialien.
