Advanced colloidal techniques for characterization of the effect of electrosteric dispersant on the colloidal stability of nanocrystalline ZrO_2 suspension(<Feature>Aqueous Solution Science for Ceramic Processing II)

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概要

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• The adsorption state and dispersion effect of an anionic polyelectrolyte (Dolapix CE64) dispersant on the stability of nanocrystalline ZrO_2 suspensions are studied by using adsorption isotherms, sedimentation, TGA, electrokinetic sonic amplitude (ESA) and Auger electron spectroscopy (AES) techniques. It was found that colloidal stability and surface properties of aqueous ZrO_2 suspension are closely related to coverage distribution of polyelectrolyte as a function of pH on nanocrystalline ZrO_2 particle surface. The amount of polyelectrolyte adsorbed on nanocrystalline ZrO_2 particle surface increases greatly with decreasing pHiep (pH 3.72) and increasing the polymer concentration. The results obtained from electroacoustic (ESA) technique and AES spectra of polyelectrolyte adsorbed on nanocrystalline ZrO_2 surface proved that both techniques are very effective ways to measure the distribution state of polyelectrolyte on nanocrystalline ceramic powder and reveal how the distribution affect the stability of the suspension. It was found that stabilization can be achieved only when conditions of both Dolapix CE64 ionization and ZrO_2 surface coverage are satisfied, suggesting an electrosteric stabilization mechanism. In conclusion, we hypothesized a stabilization model according to the model of two particles approaching to describe the influence of the adsorbed anionic polyelectrolyte configuration on particle surface and the stability of nanocrystalline ZrO_2 suspensions.

• 2009-03-01

著者

• SARRAF Hamid

  Department of Glass and Ceramics, Institute of Chemical Technology

• SABET Ali

  Polymer Engineering Department, Amir Kabir University of Technology

• HERBIG Reinhard

  Institute of Electronic und Sensor Materials, TU Bergakademie Freiberg

• HAVRDA Jiri

  Department of Glass and Ceramics, Institute of Chemical Technology

• HULINSKY Vaclav

  Department of Glass and Ceramics, Institute of Chemical Technology

• MARYSKA Martin

  Department of Glass and Ceramics, Institute of Chemical Technology

• Sabet Ali

  Polymer Engineering Department Amir Kabir University Of Technology

• Havrda Jiri

  Department Of Glass And Ceramics Institute Of Chemical Technology

• Sarraf Hamid

  Department Of Glass And Ceramics Institute Of Chemical Technology:materials And Structures Laborator

• Maryska Martin

  Department Of Glass And Ceramics Institute Of Chemical Technology

• Maryska Martin

  Department Of Glass & Ceramics Institue Of Chemidal Technology

• Herbig Reinhard

  Institute Of Electronic Und Sensor Materials Tu Bergakademie Freiberg

• Hulinsky Vaclav

  Department Of Glass And Ceramics Institute Of Chemical Technology

• Herbig Reinhard

  Institut fur keramische Werkstoffe

関連論文

• Advanced colloidal techniques for characterization of the effect of electrosteric dispersant on the colloidal stability of nanocrystalline ZrO_2 suspension(Aqueous Solution Science for Ceramic Processing II)
• Electrokinetic sonic amplitude measurement of concentrated alumina suspensions : Effect of electrosteric stabilization
• Polyimide-Silica Hybrid Materials Based on p-Aminophenyltrimethoxysilane Terminated Poly(amic acid)s

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