Thermoanalytical investigation of formamide intercalated kaolinites under quasi-isothermal conditions

Kristof, Janos, Horvath, Erzsebet, Frost, Ray L., & Kloprogge, J. Theo (2001) Thermoanalytical investigation of formamide intercalated kaolinites under quasi-isothermal conditions. Journal of Thermal Analysis and Calorimetry, 63(1), pp. 279-289.

View at publisher


The thermal behaviour of fully and partially expanded kaolinites intercalated with formamide has been investigated in nitrogen atmosphere under quasi-isothermal heating conditions at a constant, pre-set decomposition rate of 0.20 mg min–1 . With this technique it is possible to distinguish between loosely bonded (surface bonded) and strongly bonded (intercalated) formamide. Loosely bonded formamide is liberated in an equilibrium reaction under quasi-isothermal conditions at 118°C, while the strongly bonded (intercalated) portion is lost in an equilibrium, but non-isothermal process between 130 and 200°C. The presence of water in the intercalation solution can influence the amount of adsorbed formamide, but has no effect on the amount of the intercalated reagent. When the kaolinite is fully expanded, the amount of formamide hydrogen bonded to the inner surface of the mineral is 0.25 mol formamide/mol inner surface OH group. While the amount of surface bonded formamide is decreasing with time, no change can be observed in the amount of the intercalated reagent. With this technique the mass loss stages belonging to adsorbed and intercalated formamide can be resolved thereby providing a complex containing only one type of bonded (intercalated) formamide.

Impact and interest:

17 citations in Scopus
19 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 21957
Item Type: Journal Article
Refereed: Yes
DOI: 10.1023/A:1010117326869
ISSN: 1418-2874
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2001 Springer Science+Business Media B.V.
Deposited On: 17 Jun 2009 13:02
Last Modified: 07 Jul 2017 07:01

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page