Time-resolved observation of ZrO2-colloid agglomeration

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Claudia Bitea
  • Clemens Walther
  • Jae Il Kim
  • Horst Geckeis
  • Thomas Rabung
  • Franz J. Scherbaum
  • Dan G. Cacuci

Externe Organisationen

  • Karlsruher Institut für Technologie (KIT)
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)55-66
Seitenumfang12
FachzeitschriftColloids and Surfaces A: Physicochemical and Engineering Aspects
Jahrgang215
Ausgabenummer1-3
PublikationsstatusVeröffentlicht - 5 Dez. 2002
Extern publiziertJa

Abstract

The agglomeration of ZrO2-nanoparticles is investigated in situ by a combination of light scattering photon correlation spectroscopy (PCS) and laser-induced breakdown detection (LIBD). Surface charge measurements suggest a point of zero charge (PZC) for ZrO2-colloids at pH 8.2 as confirmed with PCS by agglomeration rate measurements at higher concentrations (1011 particles cm-3). The agglomeration rate is investigated further at the PZC as a function of particle concentration. Utilizing the high sensitivity of LIBD the linear dependence of the agglomeration rate was confirmed for the first time at concentrations typical for natural systems, i.e. down to 2×106 particles cm-3. The results agree with the simple diffusion limited aggregation model of Smoluchowski (sticking factor 1) and no indication of an activation barrier are found. Zr(IV) is known for its similarity to Pu(IV) regarding colloid formation and hence the present investigations can serve as a model for the aggregation of Pu(IV)-colloids, the stability of which represents an important aspect in the safety assessment of nuclear waste repositories.

ASJC Scopus Sachgebiete

Zitieren

Time-resolved observation of ZrO2-colloid agglomeration. / Bitea, Claudia; Walther, Clemens; Kim, Jae Il et al.
in: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Jahrgang 215, Nr. 1-3, 05.12.2002, S. 55-66.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Bitea, C, Walther, C, Kim, JI, Geckeis, H, Rabung, T, Scherbaum, FJ & Cacuci, DG 2002, 'Time-resolved observation of ZrO2-colloid agglomeration', Colloids and Surfaces A: Physicochemical and Engineering Aspects, Jg. 215, Nr. 1-3, S. 55-66. https://doi.org/10.1016/S0927-7757(02)00415-6
Bitea, C., Walther, C., Kim, J. I., Geckeis, H., Rabung, T., Scherbaum, F. J., & Cacuci, D. G. (2002). Time-resolved observation of ZrO2-colloid agglomeration. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 215(1-3), 55-66. https://doi.org/10.1016/S0927-7757(02)00415-6
Bitea C, Walther C, Kim JI, Geckeis H, Rabung T, Scherbaum FJ et al. Time-resolved observation of ZrO2-colloid agglomeration. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2002 Dez 5;215(1-3):55-66. doi: 10.1016/S0927-7757(02)00415-6
Bitea, Claudia ; Walther, Clemens ; Kim, Jae Il et al. / Time-resolved observation of ZrO2-colloid agglomeration. in: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2002 ; Jahrgang 215, Nr. 1-3. S. 55-66.
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abstract = "The agglomeration of ZrO2-nanoparticles is investigated in situ by a combination of light scattering photon correlation spectroscopy (PCS) and laser-induced breakdown detection (LIBD). Surface charge measurements suggest a point of zero charge (PZC) for ZrO2-colloids at pH 8.2 as confirmed with PCS by agglomeration rate measurements at higher concentrations (1011 particles cm-3). The agglomeration rate is investigated further at the PZC as a function of particle concentration. Utilizing the high sensitivity of LIBD the linear dependence of the agglomeration rate was confirmed for the first time at concentrations typical for natural systems, i.e. down to 2×106 particles cm-3. The results agree with the simple diffusion limited aggregation model of Smoluchowski (sticking factor 1) and no indication of an activation barrier are found. Zr(IV) is known for its similarity to Pu(IV) regarding colloid formation and hence the present investigations can serve as a model for the aggregation of Pu(IV)-colloids, the stability of which represents an important aspect in the safety assessment of nuclear waste repositories.",
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AU - Bitea, Claudia

AU - Walther, Clemens

AU - Kim, Jae Il

AU - Geckeis, Horst

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AU - Scherbaum, Franz J.

AU - Cacuci, Dan G.

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