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Identifier |
000376575 |
Title |
Ανόργανα-οργανικά υβριδικά ύλικα με βάση ιόντα των λανθανίδων και καρβοξυφωσφονικούς υποκαταστάτες: σύνθεση-δομή-ιδιότητες. |
Alternative Title |
Organo-inorganic hybrid materials based on lanthanides and carboxyphosphonate ligands: synthesis, structure properties. |
Author
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Παπαθανασίου, Κωνσταντίνος Ε
|
Thesis advisor
|
Δημάδης, Κωνσταντίνος
|
Reviewer
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Μήλιος, Κωνσταντίνος
Τρικαλίτης, Παντελης
|
Abstract |
Over the last years synthesis of new microporous materials has attracted enormous scientific interest due to their structure variability and their potential important properties. Consequently, these materials have been used for gas adsorption or as molecular sieves, they have wide application in catalysis and sensors construction while they are principally been used in fuel cells and hydrogen production apparatus.
This study, firstly describes the synthesis of metal-phosphonocarboxylate coordination polymers (MOFs) when hydroxyphosphonoacetic acid (HPAA) is reacted with lanthanide metals ions in several Ln3+ :HPAA molar ratios and different pH values. These polymers posses great carbon dioxide and acceptable nitrogen adsorption while they are also characterized by a crystalline-to-amorphous-to-crystalline reversible transformation. Moreover, they express satisfactory values of proton conductivity.
In the present work we will also present a description of a new crystallization technique for crystalline materials with the use of hydrogels formed by the hydrophilic polysaccharide sodium alginate as well as its application to gain synthetic access to the new crystalline materials Ca-ΑTMP (ΑTMP = amino-tris(methylenephosphonate)), Ca-PMIDA (PMIDA = phosphonomethyl-imino(diacetate)), Ca-HEDP (HEDP = hydroxyethylidenediphosphonate) with many promising properties due to their interesting crystal structures.
Characterization was achieved through the use of X-Ray Crystallography (single crystal and powder), ATR-IR Spectroscopy, FT-IR-Spectroscopy, Elemental Analysis, Scanning Electron Microscopy, Thermogravimetric Analysis and Solid State NMR.
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Language |
Greek |
Subject |
ATMP |
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Gas adsorption |
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HEDP |
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HPAA |
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Hydrogel |
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Microporous materials |
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PMIDA |
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Phosphonic acid |
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Proton conductivity |
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Λανθανίδια |
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Μικροπορώδη υλικά |
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Προσρόφηση αερίων |
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Πρωτονιακή αγωγιμότητα |
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Υδρογέλη |
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Φωσφονικά οξέα |
Issue date |
2012-11-16 |
Collection
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School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
|
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Type of Work--Post-graduate theses
|
Views |
305 |