Abstract
This study demonstrates that the degree of C60 clustering in the aqueous phase is strongly dependent on the type and concentration of encapsulating agents, such as surfactant, polymer, and natural organic matter that interact with C60. The degree of C60 clustering was quantitatively analyzed using ultraviolet - visible spectral characteristics. The dispersion status played a critical role in determining the photochemical reactivity of C60, in particular, its ability to mediate energy transfer and to produce singlet oxygen in the presence of oxygen. Consistent with findings in the organic phase, C60 in the aqueous phase lost its intrinsic photochemical reactivity when they formed aggregates. Experiments performed using a laser flash photolysis suggested that the loss of reactivity resulted from a drastic decrease in lifetime of a key reaction intermediate, that is, triplet-state C60. This study suggests that the photochemical reactivity of C60 in the aqueous phase, which has been linked to oxidative damage in biological systems in earlier studies, is strongly dependent on the media environment surrounding C60.
| Original language | English |
|---|---|
| Pages (from-to) | 1552-1557 |
| Number of pages | 6 |
| Journal | Environmental Science and Technology |
| Volume | 42 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2008 Mar 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Environmental Engineering
- Environmental Science(all)
- Environmental Chemistry
Cite this
Effect of encapsulating agents on dispersion status and photochemical reactivity of C60 in the aqueous phase. / Lee, Jaesang; Kim, Jae Hong.
In: Environmental Science and Technology, Vol. 42, No. 5, 01.03.2008, p. 1552-1557.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of encapsulating agents on dispersion status and photochemical reactivity of C60 in the aqueous phase
AU - Lee, Jaesang
AU - Kim, Jae Hong
PY - 2008/3/1
Y1 - 2008/3/1
N2 - This study demonstrates that the degree of C60 clustering in the aqueous phase is strongly dependent on the type and concentration of encapsulating agents, such as surfactant, polymer, and natural organic matter that interact with C60. The degree of C60 clustering was quantitatively analyzed using ultraviolet - visible spectral characteristics. The dispersion status played a critical role in determining the photochemical reactivity of C60, in particular, its ability to mediate energy transfer and to produce singlet oxygen in the presence of oxygen. Consistent with findings in the organic phase, C60 in the aqueous phase lost its intrinsic photochemical reactivity when they formed aggregates. Experiments performed using a laser flash photolysis suggested that the loss of reactivity resulted from a drastic decrease in lifetime of a key reaction intermediate, that is, triplet-state C60. This study suggests that the photochemical reactivity of C60 in the aqueous phase, which has been linked to oxidative damage in biological systems in earlier studies, is strongly dependent on the media environment surrounding C60.
AB - This study demonstrates that the degree of C60 clustering in the aqueous phase is strongly dependent on the type and concentration of encapsulating agents, such as surfactant, polymer, and natural organic matter that interact with C60. The degree of C60 clustering was quantitatively analyzed using ultraviolet - visible spectral characteristics. The dispersion status played a critical role in determining the photochemical reactivity of C60, in particular, its ability to mediate energy transfer and to produce singlet oxygen in the presence of oxygen. Consistent with findings in the organic phase, C60 in the aqueous phase lost its intrinsic photochemical reactivity when they formed aggregates. Experiments performed using a laser flash photolysis suggested that the loss of reactivity resulted from a drastic decrease in lifetime of a key reaction intermediate, that is, triplet-state C60. This study suggests that the photochemical reactivity of C60 in the aqueous phase, which has been linked to oxidative damage in biological systems in earlier studies, is strongly dependent on the media environment surrounding C60.
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U2 - 10.1021/es702552a
DO - 10.1021/es702552a
M3 - Article
VL - 42
SP - 1552
EP - 1557
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 5
ER -