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Barium Titanate Nanoparticles in Block Copolymer Tu Lee,*,, Nan Yao, Hiroaki Imai,, and Ilhan A. Aksay,
 

Summary: Barium Titanate Nanoparticles in Block Copolymer
Tu Lee,*,, Nan Yao, Hiroaki Imai,, and Ilhan A. Aksay,
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544
Received April 9, 2001. In Final Form: October 2, 2001
CubicBaTiO3 particlesof10nmwerecrystallizedpredominantlywithinthehydroxylatedpolybutadiene
matrix of a phase separated triblock copolymeric thin film of polystyrene-polybutadiene-polystyrene
(Kraton D1102). The barium titanated Kraton thin film had remnants of the cylindrical morphology of
a plain Kraton thin film with an interdomain spacing of 23 nm. The procedure of barium titanation
consisted of three steps: (1) in situ hydroxylation of the polybutadiene matrix of an annealed Kraton thin
film, (2) regioselective deposition of barium titanium methoxypropanoxide (BaTi(OCH2CH(CH2)OCH3)6)
on the hydroxylated polybutadiene matrix, and (3) hydrothermal reduction of the organometallic complexes
in an NH3/H2O atmosphere at 80 C for 24 h. Isolated water clusters in step 3, condensed from the NH3/H2O
atmosphere of 1 M NH4OH(aq) at 80 C in the alkoxide-Kraton films, were believed to have a typical
diameter of no more than 23 nm at a pH of 14. They gave a high pH environment to weaken the chelating
effectamongalkoxidesandtheorganicmatrixandprovidedaspatialconfinementforthelocalizednucleation
and growth of cubic BaTiO3 nanoparticles.
Introduction
The length scales defining structure and organization
determine the fundamental characteristics of a material.

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science