Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Interfacial Properties of $\gamma-Alumina/KCI^{(ag)}$ Electrical Double Layer

$\gamma$-알루미나/KCl 수용액의 전기 이중층에서 계면 물성

  • 홍영호 (단국대학교 공과대학 화학공학과) ;
  • 함영민 (단국대학교 공과대학 화학공학과) ;
  • 장윤호 (인하대학교 공과대학 화학공학과)
  • Published : 1994.06.01
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Abstract

The surface of alumina is capable of acquiring a change when it is in an aqueous solution. This surface change will have a strong influence on the surrounding ions, particularly those of opposite change known as the counter ions. A site-binding model of the {{{{ gamma }}-alumina/KCl(aq) interface was used to calculated theoretical surface ionization constants and P.Z.C.(Point of zero change) of {{{{ gamma }}-alumina. This paper was carried out to investigate the effect of calcination temperature on the acidic and electrical properties of pure {{{{ gamma }}-alumina prepared by the precipitation method from the Al(NO3)3.9H2O and NH4OH. From the experimental data it was shown that {{{{ gamma }}-alumina have a mainly Br nsted acid site. However, the acidity of {{{{ gamma }}-alumina decreased with increasing calcination temperature at strength Ho +9.3. The surface charge density of {{{{ gamma }}-alumina was increased with electrolyte ionic strength and calcination temperature.

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References

  1. Sol-Gel Science-The Physics and Chemistry of Sol-Gel Processing C.J. Brinker;G.W. Scherer
  2. Advances in Materials Characterization R.L. Snyder;R.A. Condrate;P.F. Johnson
  3. Alumina Chemicals Science and Technology Handbook LeRoy D. Hart
  4. Catalysis by Acids and Bases B. Imelik;C. Naccache;G. Coudurier;Y. Ben Taarit;J.C. Vedrine
  5. Solid Acids and Bases K. Tanabe
  6. J. Phys. Chem. v.60 The Effect of Pretreatment on the Activity of ${\gamma}$-Alumina Hindin. S. G.;S.W. Weller
  7. J. of Chem. Soc. Faraday Trans. v.70 Site-binding Model of the Electrical Double Layer at the Oxide/Water Interface D.E. Yates;S. Levine;T.W. Healy
  8. J. Colloid & Interface Sci. v.122 Exchange Enthalphies of $H^+\;and\;OH^-$ Adsorption on Minerals with Different Characters of Potential-Determining-Ions K.A. Wierer;B. Dobias
  9. J. of Kor Cer Soc. v.30 no.11 $SO_4^{2-}/Al_2O_3$의 표면전하밀도와 산적특성 함영민;홍영호;장윤호
  10. Zeta Potential in Colloid Science R.J. Hunter
  11. J. of Ame Chem. Soc. v.82 Alumina: Catalyst and Support H. Pines;W.O. Haag
  12. J. Colloid & Interface Sci v.67 Surface Ionization and Complexation at the Oxide/Water Interface Davis, J.A;Leckie, J.O.
  13. J. Colloid & Interface Sci v.100 A Thermodynamic Description of the Double Layer Surrounding Hydrous Oxides Johnson, R.E
  14. Introduction to Colloid and Surface Chemistry(4th ed.) Ducan, J. Shaw