Effect of pH on the combustion synthesis of nano-crystalline alumina powder

Synthesis of nano-crystalline alumina powder by a chemical pyrophoric reaction using citric acid and ammonia was investigated by varying the pH of the precursor solution, which played an important role in controlling the morphology of the synthesised powder. The flaky morphology obtained at pH=2 cou...

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Bibliographic Details
Published in:Materials letters 2002-12, Vol.57 (2), p.380-385
Main Authors: Pathak, L.C, Singh, T.B, Das, S, Verma, A.K, Ramachandrarao, P
Format: Article
Language:English
Subjects:
Alumina
Ceramics
Chemistry
Colloidal state and disperse state
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
General and physical chemistry
Materials science
Nanomaterials
Nanoscale materials and structures: fabrication and characterization
Nitrate–citrate process
Physics
Powder preparation
Powders
Solution combustion process
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Summary:Synthesis of nano-crystalline alumina powder by a chemical pyrophoric reaction using citric acid and ammonia was investigated by varying the pH of the precursor solution, which played an important role in controlling the morphology of the synthesised powder. The flaky morphology obtained at pH=2 could be modified to fine desegregated particulate form by varying the pH of the solution to 10. The sluggish decomposition rate at low pH was found to be responsible for the generation of flaky powders, whereas the rapid decomposition at high pH=10 yielded the fine desegregated powders. The as-prepared powders were amorphous in nature, which yielded the nano-crystalline alumina powder after calcination at elevated temperatures.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(02)00796-6