Dehydration Process of Hofmann-Type Layered Solids
In the present work the dehydration process of layered solids with formula unit M(H2O)2[Ni(CN)4]·nH2O, M = Ni, Co, Mn; n = 1, 2, 4 is studied using modulated thermogravimetry. The results show that water molecules need to overcome an energetic barrier (activation energy between 63 and 500 kJ/mol) in...
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| Format: | Article |
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MDPI AG
2013-04-01
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| Series: | Materials |
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| Online Access: | http://www.mdpi.com/1996-1944/6/4/1452 |
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| author | Edilso Reguera Enelio Torres-García Geonel Rodríguez-Gattorno Omar Reyes-Martinez |
| author_facet | Edilso Reguera Enelio Torres-García Geonel Rodríguez-Gattorno Omar Reyes-Martinez |
| author_sort | Edilso Reguera |
| collection | DOAJ |
| description | In the present work the dehydration process of layered solids with formula unit M(H2O)2[Ni(CN)4]·nH2O, M = Ni, Co, Mn; n = 1, 2, 4 is studied using modulated thermogravimetry. The results show that water molecules need to overcome an energetic barrier (activation energy between 63 and 500 kJ/mol) in order to diffuse through the interlayer region. The related kinetic parameters show a dependence on the water partial pressure. On the other hand, X-ray diffraction results provide evidence that the dehydration process is accompanied by framework collapse, limiting the structural reversibility, except for heating below 80 °C where the ordered structure remains. Removal of water molecules from the interlayer region disrupts the long-range structural order of the solid. |
| first_indexed | 2024-04-13T10:50:50Z |
| format | Article |
| id | doaj.art-19882c3fa67b4ea186803f2ecddbaf54 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-13T10:50:50Z |
| publishDate | 2013-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-19882c3fa67b4ea186803f2ecddbaf542022-12-22T02:49:39ZengMDPI AGMaterials1996-19442013-04-01641452146610.3390/ma6041452Dehydration Process of Hofmann-Type Layered SolidsEdilso RegueraEnelio Torres-GarcíaGeonel Rodríguez-GattornoOmar Reyes-MartinezIn the present work the dehydration process of layered solids with formula unit M(H2O)2[Ni(CN)4]·nH2O, M = Ni, Co, Mn; n = 1, 2, 4 is studied using modulated thermogravimetry. The results show that water molecules need to overcome an energetic barrier (activation energy between 63 and 500 kJ/mol) in order to diffuse through the interlayer region. The related kinetic parameters show a dependence on the water partial pressure. On the other hand, X-ray diffraction results provide evidence that the dehydration process is accompanied by framework collapse, limiting the structural reversibility, except for heating below 80 °C where the ordered structure remains. Removal of water molecules from the interlayer region disrupts the long-range structural order of the solid.http://www.mdpi.com/1996-1944/6/4/1452kinetics parametershi-res/modulated-TGporous latticesdehydration of lamellar solids |
| spellingShingle | Edilso Reguera Enelio Torres-García Geonel Rodríguez-Gattorno Omar Reyes-Martinez Dehydration Process of Hofmann-Type Layered Solids Materials kinetics parameters hi-res/modulated-TG porous lattices dehydration of lamellar solids |
| title | Dehydration Process of Hofmann-Type Layered Solids |
| title_full | Dehydration Process of Hofmann-Type Layered Solids |
| title_fullStr | Dehydration Process of Hofmann-Type Layered Solids |
| title_full_unstemmed | Dehydration Process of Hofmann-Type Layered Solids |
| title_short | Dehydration Process of Hofmann-Type Layered Solids |
| title_sort | dehydration process of hofmann type layered solids |
| topic | kinetics parameters hi-res/modulated-TG porous lattices dehydration of lamellar solids |
| url | http://www.mdpi.com/1996-1944/6/4/1452 |
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