Thermal analysis of Cs[H.sub.2]P[O.sub.4] nanoparticles using surfactants CTAB and F-68

A study concerned to thermogravimetric analysis is performed in cesium dihydrogen phosphate (Cs[H.sub.2]P[O.sub.4]) that was synthesized, using cetyltrimethylammonium-bromide (CTAB), polyoxyethylene-polyoxypropylene (F-68) and mixture of (F-68:CTAB) with two mole ratio 0.06 and 0.12 as surfactant. T...

Full description

Saved in:
Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2010-01, Vol.99 (1), p.197
Main Authors: Hosseini, S, Mohamad, A.B, Kadhum, A.H, Daud, W.R. Wan
Format: Article
Language:English
Subjects:
Analysis
Calorimetry
Phosphates
Surface active agents
Toy industry
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A study concerned to thermogravimetric analysis is performed in cesium dihydrogen phosphate (Cs[H.sub.2]P[O.sub.4]) that was synthesized, using cetyltrimethylammonium-bromide (CTAB), polyoxyethylene-polyoxypropylene (F-68) and mixture of (F-68:CTAB) with two mole ratio 0.06 and 0.12 as surfactant. The dehydration behavior of particles was studied using thermal gravimetric analysis and differential scanning calorimetric. Subsequently, the experimental results indicated that the first dehydration temperature in the range of 237-239[degrees]C upon heating, the second peaks occur at temperature range 290-295[degrees]C and overlapping in the thermogravimetric events is observed. The mass loss values are obtained in the range of 6.62-6.97 wt% that is less than reported theoretical value 7.8 wt%. These values show well compatibility of reaction Cs[H.sub.2]P[O.sub.4] to [Cs.sub.2][H.sub.2][P.sub.2][O.sub.7] with 3.92 wt% whereas mass loss value of Cs[H.sub.2]P[O.sub.4] to CsP[O.sub.3] is less than theoretical value 7.8 wt%. The activation energy of two steps dehydration are calculated using Kissinger equation for the samples synthesized via CTAB and (F-68) with minimum value mass loss 6.62% and maximum value mass loss 6.97%, respectively. The calculation results reveal that the reaction rate in the first step (Cs[H.sub.2]P[O.sub.4] [right arrow] [Cs.sub.2][H.sub.2][P.sub.2][O.sub.7])is faster than the second step (Cs[H.sub.2]P[O.sub.4] [right arrow] CsP[O.sub.3]). The weight loss values of the samples demonstrate that existence of CTAB can be considered as effective factor which prevents more weight loss during the dehydration process.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-009-0132-2