Dispersion of aqueous nano-sized alumina suspensions using cationic polyelectrolyte

Yu Jen Shin; Chia Chi Su; Yun Hwei Shen

doi:10.1016/j.materresbull.2006.01.032

Dispersion of aqueous nano-sized alumina suspensions using cationic polyelectrolyte

Yu Jen Shin
, Chia Chi Su
, Yun Hwei Shen

Department of Resources Engineering

Research output: Contribution to journal › Article › peer-review

49 Citations (Scopus)

Abstract

In this paper, we investigate and report the effects of a cationic polyelectrolyte, polydiallydimethylammonium chloride (PDADMAC), on the stability of nano-sized alumina (α-Al₂O₃) suspension. Due to the static electrical repulsion interactions, PDADMAC show significant adsorption on α-Al₂O₃ only at alkaline pH. Considerable amount of non-adsorbed free PDADMAC exist in α-Al₂O₃ suspensions dispersed by PDADMAC at acidic and neutral pH. At 1.0 wt.% PDADMAC addition, α-Al₂O₃ became highly positively charged (>50 mV) in the entire pH range contrast with that the stability of α-Al₂O₃ suspension is enhanced only over the basic pH range in the presence of anionic polyelectrolyte. Free PDADMAC electrolyte in suspension results in increasing viscosity of α-Al₂O₃ suspensions dispersed with PDADMAC at alkaline and neutral pH. However, non-adsorbed free PDADMAC in suspension do not contribute to viscosity increase in acidic α-Al₂O₃ suspensions and α-Al₂O₃ suspensions dispersed with PDADMAC show the best flow behavior at acidic pH.

Original language	English
Pages (from-to)	1964-1971
Number of pages	8
Journal	Materials Research Bulletin
Volume	41
Issue number	10
DOIs	https://doi.org/10.1016/j.materresbull.2006.01.032
Publication status	Published - 2006 Oct 12

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.materresbull.2006.01.032

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title = "Dispersion of aqueous nano-sized alumina suspensions using cationic polyelectrolyte",

abstract = "In this paper, we investigate and report the effects of a cationic polyelectrolyte, polydiallydimethylammonium chloride (PDADMAC), on the stability of nano-sized alumina (α-Al2O3) suspension. Due to the static electrical repulsion interactions, PDADMAC show significant adsorption on α-Al2O3 only at alkaline pH. Considerable amount of non-adsorbed free PDADMAC exist in α-Al2O3 suspensions dispersed by PDADMAC at acidic and neutral pH. At 1.0 wt.\% PDADMAC addition, α-Al2O3 became highly positively charged (>50 mV) in the entire pH range contrast with that the stability of α-Al2O3 suspension is enhanced only over the basic pH range in the presence of anionic polyelectrolyte. Free PDADMAC electrolyte in suspension results in increasing viscosity of α-Al2O3 suspensions dispersed with PDADMAC at alkaline and neutral pH. However, non-adsorbed free PDADMAC in suspension do not contribute to viscosity increase in acidic α-Al2O3 suspensions and α-Al2O3 suspensions dispersed with PDADMAC show the best flow behavior at acidic pH.",

author = "Shin, \{Yu Jen\} and Su, \{Chia Chi\} and Shen, \{Yun Hwei\}",

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AU - Su, Chia Chi

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N2 - In this paper, we investigate and report the effects of a cationic polyelectrolyte, polydiallydimethylammonium chloride (PDADMAC), on the stability of nano-sized alumina (α-Al2O3) suspension. Due to the static electrical repulsion interactions, PDADMAC show significant adsorption on α-Al2O3 only at alkaline pH. Considerable amount of non-adsorbed free PDADMAC exist in α-Al2O3 suspensions dispersed by PDADMAC at acidic and neutral pH. At 1.0 wt.% PDADMAC addition, α-Al2O3 became highly positively charged (>50 mV) in the entire pH range contrast with that the stability of α-Al2O3 suspension is enhanced only over the basic pH range in the presence of anionic polyelectrolyte. Free PDADMAC electrolyte in suspension results in increasing viscosity of α-Al2O3 suspensions dispersed with PDADMAC at alkaline and neutral pH. However, non-adsorbed free PDADMAC in suspension do not contribute to viscosity increase in acidic α-Al2O3 suspensions and α-Al2O3 suspensions dispersed with PDADMAC show the best flow behavior at acidic pH.

AB - In this paper, we investigate and report the effects of a cationic polyelectrolyte, polydiallydimethylammonium chloride (PDADMAC), on the stability of nano-sized alumina (α-Al2O3) suspension. Due to the static electrical repulsion interactions, PDADMAC show significant adsorption on α-Al2O3 only at alkaline pH. Considerable amount of non-adsorbed free PDADMAC exist in α-Al2O3 suspensions dispersed by PDADMAC at acidic and neutral pH. At 1.0 wt.% PDADMAC addition, α-Al2O3 became highly positively charged (>50 mV) in the entire pH range contrast with that the stability of α-Al2O3 suspension is enhanced only over the basic pH range in the presence of anionic polyelectrolyte. Free PDADMAC electrolyte in suspension results in increasing viscosity of α-Al2O3 suspensions dispersed with PDADMAC at alkaline and neutral pH. However, non-adsorbed free PDADMAC in suspension do not contribute to viscosity increase in acidic α-Al2O3 suspensions and α-Al2O3 suspensions dispersed with PDADMAC show the best flow behavior at acidic pH.

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DO - 10.1016/j.materresbull.2006.01.032

M3 - Article

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EP - 1971

JO - Materials Research Bulletin

JF - Materials Research Bulletin

IS - 10

ER -

Dispersion of aqueous nano-sized alumina suspensions using cationic polyelectrolyte

Abstract

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