Enthalpy of formation of crystalline surfactant molecular complexes
| Autor: | Kyoko Ikarashi, Hirotaka Hirata, Nahoko Iimura |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Exothermic reaction Enthalpy Cationic polymerization Condensed Matter Physics Standard enthalpy of formation Enthalpy change of solution Chemical species chemistry Chemical engineering Pulmonary surfactant Organic chemistry Physical and Theoretical Chemistry Instrumentation Alkyl |
| Zdroj: | Thermochimica Acta. 360:121-129 |
| ISSN: | 0040-6031 |
| Popis: | The standard enthalpy of formation of novel chemical species — crystalline cationic surfactant molecular complexes — was studied to elucidate the bonding nature, serially scanning over the different surfactant chain-length homologs and various additive species. The enthalpy was not large, but was obviously dependent on the surfactant chain length and the chemical nature of the additive species. The typical complexes comprising long alkyl chain surfactants were formed endothermally, while in short alkyl chain homologs the process was exothermic. By examining the thermal aspect, it was suggested that the typical complexes of long alkyl-chain surfactants were derived not from attractive energetic force factors, but rather from entropic factors associated with the occurrence of severe disorder caused by heavy thermal agitation in the complex crystalline state. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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