Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties

The purpose of this study was to investigate influences of temperature on the conversion of ammonium tungstate pentahydrate (ATP) powder to tungsten trioxide (WO3) particles with controllable sizes, crystallinities, and physicochemical properties. In this study, we used a simple thermal decompositio...

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Main Authors:	Nandiyanto, Asep Bayu Dani, Munawaroh, Heli Siti Halimatul, Kurniawan, Tedi, Mudzakir, Ahmad
Format:	Article
Language:	English
Published:	Department of Chemistry, Universitas Gadjah Mada Yogyakarta 2016
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/13949/ http://umpir.ump.edu.my/id/eprint/13949/ http://umpir.ump.edu.my/id/eprint/13949/ http://umpir.ump.edu.my/id/eprint/13949/1/Influences%20of%20Temperature%20on%20the%20Conversion%20of%20Ammonium%20Tungstate%20Pentahydrate%20to.pdf

id	oai:umpir.ump.edu.my:13949
recordtype	eprints
spelling	oai:umpir.ump.edu.my:139492016-08-24T06:04:05Z http://umpir.ump.edu.my/id/eprint/13949/ Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties Nandiyanto, Asep Bayu Dani Munawaroh, Heli Siti Halimatul Kurniawan, Tedi Mudzakir, Ahmad TJ Mechanical engineering and machinery The purpose of this study was to investigate influences of temperature on the conversion of ammonium tungstate pentahydrate (ATP) powder to tungsten trioxide (WO3) particles with controllable sizes, crystallinities, and physicochemical properties. In this study, we used a simple thermal decomposition method. In the experimental procedure, we explored the effect of temperature on the physicochemical properties of ATP by testing various heating temperatures (from 100 to 900 °C). The heated ATP samples were then characterized by a physical observation (i.e. color) and various analysis methods (i.e. a thermal gravimetric and differential thermal analysis, infrared spectroscopy, an X-ray diffraction, and a scanning electron microscope). Experimental results showed that increases in temperature had an impact to the decreases in particle size, the change in material crystallinity, and the change in physical properties (e.g. change of color from white, orange, to yellowish green). The relationships between the reaction temperatures and the physicochemical properties of the ATP were also investigated in detail along with the theoretical consideration and the proposal of the WO3 particle formation mechanism. In simplification, the phenomena can be described into three zones of temperatures. (1) Below 250 °C (release of water molecules and some ammonium ions).; (2) At 250-400 °C (release of water molecules and ammonium ions, restructurization of tungsten and oxygen elements, and formation of amorphous tungsten trioxide). (3) At higher than 400 °C (crystallization of tungsten trioxide). Since ATP possessed reactivity on temperature, its physicochemical properties changing could be observed easily, and the experimental procedure could be done easily. The present study will benefit not only for “chemistry and material science” but also potentially to be used as a model material for explaining the thermal behavior of material to undergraduate students (suitable used for a class and laboratory experiment and demonstration). Department of Chemistry, Universitas Gadjah Mada Yogyakarta 2016 Article PeerReviewed application/pdf en cc_by http://umpir.ump.edu.my/id/eprint/13949/1/Influences%20of%20Temperature%20on%20the%20Conversion%20of%20Ammonium%20Tungstate%20Pentahydrate%20to.pdf Nandiyanto, Asep Bayu Dani and Munawaroh, Heli Siti Halimatul and Kurniawan, Tedi and Mudzakir, Ahmad (2016) Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties. Indonesian Journal of Chemistry, 16 (2). pp. 124-129. ISSN 1411-9420 (Print); 2460-1578 (Online) http://pdm-mipa.ugm.ac.id/ojs/index.php/ijc/article/view/1092 DOI: 10.14499/ijc-v16i2p124-129
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Nandiyanto, Asep Bayu Dani Munawaroh, Heli Siti Halimatul Kurniawan, Tedi Mudzakir, Ahmad Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties
description	The purpose of this study was to investigate influences of temperature on the conversion of ammonium tungstate pentahydrate (ATP) powder to tungsten trioxide (WO3) particles with controllable sizes, crystallinities, and physicochemical properties. In this study, we used a simple thermal decomposition method. In the experimental procedure, we explored the effect of temperature on the physicochemical properties of ATP by testing various heating temperatures (from 100 to 900 °C). The heated ATP samples were then characterized by a physical observation (i.e. color) and various analysis methods (i.e. a thermal gravimetric and differential thermal analysis, infrared spectroscopy, an X-ray diffraction, and a scanning electron microscope). Experimental results showed that increases in temperature had an impact to the decreases in particle size, the change in material crystallinity, and the change in physical properties (e.g. change of color from white, orange, to yellowish green). The relationships between the reaction temperatures and the physicochemical properties of the ATP were also investigated in detail along with the theoretical consideration and the proposal of the WO3 particle formation mechanism. In simplification, the phenomena can be described into three zones of temperatures. (1) Below 250 °C (release of water molecules and some ammonium ions).; (2) At 250-400 °C (release of water molecules and ammonium ions, restructurization of tungsten and oxygen elements, and formation of amorphous tungsten trioxide). (3) At higher than 400 °C (crystallization of tungsten trioxide). Since ATP possessed reactivity on temperature, its physicochemical properties changing could be observed easily, and the experimental procedure could be done easily. The present study will benefit not only for “chemistry and material science” but also potentially to be used as a model material for explaining the thermal behavior of material to undergraduate students (suitable used for a class and laboratory experiment and demonstration).
format	Article
author	Nandiyanto, Asep Bayu Dani Munawaroh, Heli Siti Halimatul Kurniawan, Tedi Mudzakir, Ahmad
author_facet	Nandiyanto, Asep Bayu Dani Munawaroh, Heli Siti Halimatul Kurniawan, Tedi Mudzakir, Ahmad
author_sort	Nandiyanto, Asep Bayu Dani
title	Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties
title_short	Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties
title_full	Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties
title_fullStr	Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties
title_full_unstemmed	Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties
title_sort	influences of temperature on the conversion of ammonium tungstate pentahydrate to tungsten oxide particles with controllable sizes, crystallinities, and physical properties
publisher	Department of Chemistry, Universitas Gadjah Mada Yogyakarta
publishDate	2016
url	http://umpir.ump.edu.my/id/eprint/13949/ http://umpir.ump.edu.my/id/eprint/13949/ http://umpir.ump.edu.my/id/eprint/13949/ http://umpir.ump.edu.my/id/eprint/13949/1/Influences%20of%20Temperature%20on%20the%20Conversion%20of%20Ammonium%20Tungstate%20Pentahydrate%20to.pdf
first_indexed	2018-09-07T01:50:46Z
last_indexed	2018-09-07T01:50:46Z
_version_	1610911628813926400

Influences of Temperature on the Conversion of Ammonium Tungstate Pentahydrate to Tungsten Oxide Particles with Controllable Sizes, Crystallinities, and Physical Properties

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