Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/43667
標題: Dispersion and rheology of BaTiO3 nanoparticles in ethanol-isopropanol solvents
作者: Tseng, W.J.J.
曾文甲
Wang, S.R.
關鍵字: barium titanate
BaTiO3
agglomeration
nanoparticle
rheology
barium-titanate
polyacrylic-acid
suspension
stabilization
particles
mixtures
behavior
powders
films
期刊/報告no:: Journal of Electroceramics, Volume 18, Issue 3-4, Page(s) 197-204.
摘要: Barium titanate (BaTiO3) nanoparticles were dispersed in ethanol-isopropanol mixtures and their rheological behaviors were examined in terms of surfactant concentration (0-5 wt.% of the solids) and volumetric solids loading (phi = 0.10 - 0.35) over a shear-rate (gamma) range 1 to 1,000 s(-1). An oxyethylene-based polymeric surfactant was used to facilitate the nanoparticle dispersion. A pronounced viscosity reduction, > 95% when compared to the suspensions without the dispersant, resulted with a surfactant concentration of 4 wt.% at a constant shear rate of 100 s(-1). This finding was in parallel with a simultaneous reduction in the mean "floc" size of the suspensions. Shear-thinning flow character resulted over most of the shear-rate range examined, especially for the concentrated suspensions with phi >= 0.25. The concentrated suspensions were indeed flocculated. This increased instability was partly due to the compression of electrical double layer as the particulate solids became more crowded in the carrier solvents, and also to the increased "effective" solids concentration because of the preferential adsorption of the surfactant molecules on the nanoparticle surface.
URI: http://hdl.handle.net/11455/43667
ISSN: 1385-3449
文章連結: http://dx.doi.org/10.1007/s10832-007-9026-5
Appears in Collections:材料科學與工程學系

文件中的檔案:

取得全文請前往華藝線上圖書館



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.