Role of the initial degree of ionization of polyethylenimine in the dispersion of silicon carbide nanoparticles

Xinwen Zhu, Fengqiu Tang, Tohru Suzuki, Yoshio Sakka

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

The role of the initial degree of ionization (α i ) of polyethylenimine (PEI) in the dispersion of SiC nanopartilces in water was investigated by sedimentation and rheological measurements. The ionization of PEI was characterized by potentiometric titration, which indicated a pH-dependent conformational transition. The dispersion of SiC particles in the presence of PEI was found to strongly depend on the α i . In the presence of 0.4% by weight PEI, the 23.8% SiC by volume (Φ SiC = 23.8) slurries showed a Newtonian behavior for α i = 0.12-0.4 values, whereas a shear-thinning behavior was observed for α i > 0.4 in the optimal pH range of around pH 4. The rheological behavior of the slurries exhibited a strong dependence on the concentration of PEI of α i = 0.12-0.4 and the slurry showed a Newtonian behavior at an optimal concentration of 0.4% by weight. The stabilization may be dominated by an electrosteric effect arising from the adsorbed PEI of α i = 0.12-0.4. The flocculation mechanism of the slurries with PEI of α i > 0.4 is also discussed.

Original languageEnglish
Pages (from-to)189-191
Number of pages3
JournalJournal of the American Ceramic Society
Volume86
Issue number1
DOIs
Publication statusPublished - 2003 Jan 1
Externally publishedYes

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Polyethyleneimine
Slurries
Silicon carbide
Ionization
Nanoparticles
Shear thinning
Flocculation
Titration
Sedimentation
Stabilization
silicon carbide
Water

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Role of the initial degree of ionization of polyethylenimine in the dispersion of silicon carbide nanoparticles. / Zhu, Xinwen; Tang, Fengqiu; Suzuki, Tohru; Sakka, Yoshio.

In: Journal of the American Ceramic Society, Vol. 86, No. 1, 01.01.2003, p. 189-191.

Research output: Contribution to journalArticle

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