Metal organic frameworks (241 Ergebnisse)

Softcover. Zustand: Fair. Verschmutzung; Leichte Kratzer / Abnutzungen / Druckstellen. The separation of isotopes poses significant challenges due to their identical size, shape, and thermodynamic properties. Current methods for deuterium extraction, such as the Girdler Sulfid process and cryogenic distillation, yield low separation factors (below 2.5) and incur high energy costs. Helium-3 is typically produced as a byproduct of radioactive tritium decay. This research explores two alternative methods for separating light isotopes: Quantum Sieving and Chemical Affinity Sieving. Quantum Sieving utilizes confinement in small pores, while Chemical Affinity Sieving depends on strong adsorption sites, both leveraging the mass difference of isotopes linked to their zero-point energy. Microporous metal-organic frameworks serve as ideal candidates for these studies, given their defined pore structures and the ability to incorporate strong adsorption sites. Isotope mixtures were exposed to these frameworks, and the quantities of adsorbed isotopes were measured using low-temperature thermal desorption spectroscopy (TDS). The ratio of desorbed isotopes directly determines the selectivity (separation factor), which varies with exposure time and temperature. Notably, a maximum selectivity of 25 was achieved for hydrogen isotopes at temperatures significantly above the boiling point of liquid nitrogen.…

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1st ed. 2021. 16 x 24 cm. V, 212 S. V, 212 p. 78 illus., 75 illus. in color. Hardcover Versand aus Deutschland / We dispatch from Germany via Air Mail. Einband bestoßen, daher Mängelexemplar gestempelt, sonst sehr guter Zustand. Imperfect copy due to slightly bumped cover, apart from this in very good condition. Stamped. Sprache: Englisch.…

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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Document from the year 2022 in the subject Chemistry - Macromolecular Chemistry, Polymer Chemistry, grade: 17, Gauhati University, language: English, abstract: Porous coordination polymers, also known as metal organic frameworks are a new type of hybrid material constructed via self-assembly of metal ions/metal clusters which function as nodes and organic ligands which act as bridges or linkers. They are one of the earliest developed classes of metal containing polymers. They extend infinitely one, two or three dimensional framework through coordination bonding, hydrogen bonding, ¿¿¿ stacking, C-H-¿ interactions as well as van der Waal forces. These weaker non-covalent interactions, are important for the packing of the one dimensional chains, two-dimensional nets and three-dimensional frameworks.In view of the tunable structures and promising properties shown by these systems various complexities have been prepared and thoroughly investigated over last decade. MOFs are currently flourishing fields of research owing to their intriguing structural motifs and various potential applications, in the field of gas storage, gas separation, catalysis, ion exchange, microelectronics, non linear optics, sensors, medicine and molecular magnetism etc. They possess structural regularity, high porosity, high surface area resulting in greater potential applications than conventional zeolites or activated carbons and mesoporous silica. For the construction of porous coordination polymers with diverse structures and properties selection of the special inorganic and organic building blocks is one of the important factors.Multicarboxylate organic ligands have proved to be an excellent choice for the construction of MOFs of higher nuclearity due to their different coordination modes with the metals, molecular flexibilities and structural stabilities. Metal carboxylate linker in combination with cross linked or pillered polypyridine have generated many interesting coordination architecture. Making use of transition metal carboxylate and linear bridging auxiliary ligands it is possible to construct 1-D, 2-D and 3-D porous coordination polymer of different pore structures and porosities. Aside from coordination bonding interactions, various non-covalent bonding or some weak intra- or intermolecular interactions, such as hydrogen-bonding, ¿¿¿ stacking and C¿H¿¿ interactions or van der Waals interactions also influence the formation of final architectures.…

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Zustand: New. Brand New. Soft Cover International Edition. Different ISBN and Cover Image. Priced lower than the standard editions which is usually intended to make them more affordable for students abroad. The core content of the book is generally the same as the standard edition. The country selling restrictions may be printed on the book but is no problem for the self-use. This Item maybe shipped from US or any other country as we have multiple locations worldwide.…

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PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

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Paperback. Zustand: Brand New. 52 pages. 8.66x5.91x0.12 inches. In Stock.

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Paperback. Zustand: Brand New. 84 pages. 8.66x5.91x0.19 inches. In Stock.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Diese Arbeit behandelt den Prozess der Photonen-Hochkonversion in oberflächengebundenen metal-organischen Gerüsten. Bei der Hochkonversion werden zwei niederenergetische Photonen absorbiert und zu einem höherenergetischen Photon verschmolzen, welches emitiert wird. In dieser Arbeit wird dieser Vorgang in oberflächengebundenen metal-organischen Gerüsten mittels spektroskopischer Methoden analysiert. Weiterhin wird die Anwendung für die Effizienzsteigerung von Solarzellen diskutiert. This work deals with the process of photon upconversion in surface-anchored metal-organic frameworks. During the upconversion, two low-energy photons are absorbed and fused into a higher-energy photon, which is emitted. In this work, this process is analyzed in surface-bound metal-organic frameworks by spectroscopic methods. Furthermore, the application for increasing the efficiency of solar cells is discussed.…

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Zustand: New. pp. 244.

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Zustand: New. This is a Brand-new US Edition. This Item may be shipped from US or any other country as we have multiple locations worldwide.

Taschenbuch. Zustand: Neu. Mixed Ligand Metal Organic Frameworks for Drugs Carriers | Ling Li | Taschenbuch | 52 S. | Englisch | 2016 | LAP LAMBERT Academic Publishing | EAN 9783330012998 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu. …

Paperback. Zustand: Brand New. 342 pages. 9.18x6.12x9.21 inches. In Stock.

Taschenbuch. Zustand: Neu. METAL ORGANIC FRAMEWORKS | From Design to Applications | Mookkandi Palsamy Kesavan (u. a.) | Taschenbuch | Englisch | 2025 | LAP LAMBERT Academic Publishing | EAN 9786208428938 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.…

Paperback. Zustand: Brand New. 398 pages. 9.45x6.69x1.65 inches. In Stock.

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Zustand: New. 2025. 1st Edition. paperback. . . . . . Books ship from the US and Ireland.

Hardcover. Zustand: Good. No Jacket. Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.