ポリエチレンイミンによるイットリア微粒子水系サスペンションの安定化と電気泳動堆積挙動

概要

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Stability of aqueous suspensions of yttria nano-sized particles prepared with Polyethylenimine (PET) of three different molecular weights (M_w), 1800, 10000 and 70000, was investigated. Stability of the suspensions as a function of time was estimated by a viscosity measurement and infrared absorption spectroscopy (FT-IR). The highest stability was observed for the suspension prepared with PET of M_w 10000. Isoelectric point of yttria was increased from 8.4 to 10.0 by PET adsorption. PET effectively works on the yttria particles not only to give positive surface charge but also to suppress hydration in aqueous solvent. Positively-charged yttria particles by PET modification were deposited on a cathode by electrophoretic deposition and dense thick layer was successfully obtained.
2002-09-01