Details
| Original language | English |
|---|---|
| Pages (from-to) | 55-66 |
| Number of pages | 12 |
| Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
| Volume | 215 |
| Issue number | 1-3 |
| Publication status | Published - 5 Dec 2002 |
| Externally published | Yes |
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.
Keywords
- Colloid agglomeration, LIBD, Plutonium, Zirconia
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Colloid and Surface Chemistry
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In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 215, No. 1-3, 05.12.2002, p. 55-66.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Time-resolved observation of ZrO2-colloid agglomeration
AU - Bitea, Claudia
AU - Walther, Clemens
AU - Kim, Jae Il
AU - Geckeis, Horst
AU - Rabung, Thomas
AU - Scherbaum, Franz J.
AU - Cacuci, Dan G.
PY - 2002/12/5
Y1 - 2002/12/5
N2 - 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.
AB - 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.
KW - Colloid agglomeration
KW - LIBD
KW - Plutonium
KW - Zirconia
UR - http://www.scopus.com/inward/record.url?scp=0037470896&partnerID=8YFLogxK
U2 - 10.1016/S0927-7757(02)00415-6
DO - 10.1016/S0927-7757(02)00415-6
M3 - Article
AN - SCOPUS:0037470896
VL - 215
SP - 55
EP - 66
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
IS - 1-3
ER -