Geopolymers
Inorganic polymeric new materials
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A. Foppoli
A. Foppoli
Università degli Studi di Milano Dipartimento di Scienze Farmaceutiche “P. Pratesi” via G. Colombo 71 20133 Milan Italy
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L. Zema
L. Zema
Università degli Studi di Milano Dipartimento di Scienze Farmaceutiche “P. Pratesi” via G. Colombo 71 20133 Milan Italy
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A. Maroni
A. Maroni
Università degli Studi di Milano Dipartimento di Scienze Farmaceutiche “P. Pratesi” via G. Colombo 71 20133 Milan Italy
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M. Sangalli
M. Sangalli
Università degli Studi di Milano Dipartimento di Scienze Farmaceutiche “P. Pratesi” via G. Colombo 71 20133 Milan Italy
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M. Caira
M. Caira
University of Cape Town Department of Chemistry Rondebosch 7701 Cape Town South Africa
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A. Gazzaniga
A. Gazzaniga
Università degli Studi di Milano Dipartimento di Scienze Farmaceutiche “P. Pratesi” via G. Colombo 71 20133 Milan Italy
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Abstract
A hydrated form of theophylline-7-acetic acid obtained by recrystallization from water is described and characterized in terms of thermal properties, physical stability with respect to relative humidity and dehydration kinetics. The hydrate resulted to be stable at ambient conditions. Fitting of experimental dehydration data to solid state reaction equations suggests a three dimensional phase boundary reaction proceeding from the surface of the crystal inward along three dimensions. The relevant activation energy calculated from the Arrhenius plot is 173 kJ/mol.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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