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Synthesis and dispersion of nanocrys...

Wang, Xinyu.

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Synthesis and dispersion of nanocrystalline barium titanate particles.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Synthesis and dispersion of nanocrystalline barium titanate particles./
Author:	Wang, Xinyu.
Description:	193 p.
Notes:	Adviser: Burtrand I. Lee.
Contained By:	Dissertation Abstracts International63-11B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3071575
ISBN:	0493915656

Synthesis and dispersion of nanocrystalline barium titanate particles.
Wang, Xinyu.

Synthesis and dispersion of nanocrystalline barium titanate particles. - 193 p.

Adviser: Burtrand I. Lee.

Thesis (Ph.D.)--Clemson University, 2002.

The objective of current work is to meet the challenges in multilayer ceramic capacitor (MLCC) processing in aqueous media, which can be divided into two fields: nanocrystalline BaTiO3 synthesis and colloidal dispersion of BaTiO3 in water.

ISBN: 0493915656Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Synthesis and dispersion of nanocrystalline barium titanate particles.
LDR:03266nam 2200289 a 45 001 932600
005 20110505
008 110505s2002 eng d
020 $a 0493915656
035 $a (UnM)AAI3071575
035 $a AAI3071575
040 $a UnM $c UnM
100 1 $a Wang, Xinyu. $3 1021717
245 1 0 $a Synthesis and dispersion of nanocrystalline barium titanate particles.
300 $a 193 p.
500 $a Adviser: Burtrand I. Lee.
500 $a Source: Dissertation Abstracts International, Volume: 63-11, Section: B, page: 5464.
502 $a Thesis (Ph.D.)--Clemson University, 2002.
520 $a The objective of current work is to meet the challenges in multilayer ceramic capacitor (MLCC) processing in aqueous media, which can be divided into two fields: nanocrystalline BaTiO3 synthesis and colloidal dispersion of BaTiO3 in water.
520 $a A novel ambient condition sol (ACS) process has been developed to prepare BaTiO3 in a simple, low cost manner. The resulting BaTiO3 powders were characterized by various techniques, such as XRD, SEM/TEM, FT-IR, FT-Raman, DLS, etc. The results indicated that the morphology and properties of BaTiO3 powders were closely related to the solution pH, Ba/Ti ratio in precursors, anionic groups in precursors, mineralizer, and refluxing media. BaTiO3 particles with smaller crystallite size and less lattice defects can be prepared in organic solvents with low dielectric constant. All the BaTiO3 powders prepared by ACS process were metastable cubic phase with some tetragonality. The mechanism of BaTiO3 formation was studied and a gel-sol “in-situ transformation” mechanism has been proposed. Incorporating polymer species during powder synthesis led to re-dispersible BaTiO3 with superior rheological property and colloidal stability to the commercial references. For the first time, BaTiO3 powders has been prepared in a totally no-aqueous system, which can be fully crystallized at 600°C in cubic phase with primary particle size as 30 nm. Nanocrystalline TiO2 with brookite structure has been prepared by ACS process, which indicated that ACS process can be extended to prepare other oxides.
520 $a The colloidal stability of aqueous suspensions of commercial BaTiO 3 has been studied in the presence of various polyelectrolytes. BaTiO 3 powders were observed unstable in water and cannot be dispersed in the absence of polymer dispersants. The adsorption and conformation of polyelectrolytes were found strongly pH dependent, which in turn affected the suspension stability. The stabilization mechanism of BaTiO3 suspension with polyelectrolyte was proposed as a combination of electrostatic repulsion and steric hindrance. A new polyelectrolyte was synthesized and showed superior to the commercial dispersants in dispersing BaTiO3 due to its large stabilizing moieties.
590 $a School code: 0050.
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0794
710 2 0 $a Clemson University. $3 997173
773 0 $t Dissertation Abstracts International $g 63-11B.
790 $a 0050
790 1 0 $a Lee, Burtrand I., $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3071575