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Effect of Tween‐80 on the Control of Particle Size and Shrinkage Properties of Nanoscale α‐Alumina Synthesized by Sol–Gel Processing
Author(s) -
Sharma Pramod K.,
Varadan Vasundara V.,
Varadan Vijay K.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00502.x
Subject(s) - materials science , shrinkage , particle size , phase (matter) , nanoscopic scale , exothermic reaction , transmission electron microscopy , particle (ecology) , sol gel , powder diffraction , chemical engineering , differential thermal analysis , diffraction , crystallography , chemistry , composite material , nanotechnology , organic chemistry , oceanography , physics , optics , geology , engineering
The concept of tailored interfaces has been applied to the synthesis of nanoscale α‐Al 2 O 3 . Tween‐80 (poly‐oxyethylene(20) sorbitan monooleate, T‐80) was used as a surface modifier in the sol–gel process for this purpose. High‐resolution transmission electron microscopy study of the powder obtained with T‐80 confirmed the particle size of α‐Al 2 O 3 (∼55 nm) and morphology (spherical). The exothermic peak temperature in the differential thermal analysis was shifted to a lower temperature (∼917°C) when the powder was derived from a T‐80 modifier content of 10 wt%. X‐ray diffraction showed that the α‐Al 2 O 3 phase was the major phase that existed in modifier‐derived powder that was sintered at 1000°C. The experiments, based on linear shrinkage, indicated that the powder with T‐80 (10 wt%) could be densified at a low temperature.