Size Distribution Analysis of C60 Solid Powder in Water
Size Distribution Analysis of C60 Solid Powder in Water
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C60固体粉末在水中的粒度分布分析
DOI：
10.1166/nnl.2017.2286
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发表时间：
2017-02
影响因子：
--
通讯作者：
He Y.L.
中科院分区：
文献类型：
--
作者：
Zhang B.;Yin T.R.;Ge L.;He Y.L.
纳米颗粒的粒度分布对于其在环境中的运输、归宿及其生物毒性至关重要。这项工作采用不对称流场流动分级结合多角度光散射（AF 4-MALS）来评估溶液性质（例如pH、离子强度（IS）和天然有机物（NOM））对纳米C60粒度分布的影响C60粉末在水中的长期混合。最初形成大的nC 60簇（尺寸为几微米），并逐渐解聚成20至500 nm的小颗粒。随着pH值从5.65增加到9.04，30-100 nm的小粒径nC_（60）颗粒所占比例逐渐减少（占颗粒数的90.8%），而130-140 nm的颗粒所占比例逐渐增加。与在纯水中形成的nC 60粒径分布（半径为130-150 nm）相比，0.001 mol · L-1的低离子强度（IS）促进了nC 60的解聚，同时减小了nC 60的粒径（半径为80-110 nm）。当IS增加到0.01 mol stecL-1时，溶液中nC 60颗粒聚集，粒径分布在120-140 nm之间。0 ~ 10 mg · L-1的腐殖酸能促进水中非聚集态nC 60的形成，抑制其聚集。NOM和IS共同影响了nC 60的粒径分布。在低浓度（5 mg · L-1）NOM时，高浓度（0.1mol· L-1）IS促进了nC 60颗粒的形成（半径为-1），IS的增加导致nC 60团簇的解聚。
Particle size distribution of nanoparticles is critical for transport, fate, and their biological toxicity in the environment. This work employed asymmetrical flow field flow fractionation coupled with multiangle light scattering (AF4-MALS) to evaluate the effects of solution properties such as pH, ionic strength (IS), and natural organic matter (NOM) on the size distribution of nanosized C60 during long-term mixing of C60 powder in water. Large nC60 clusters (a few micrometers in size) were initially formed and gradually disaggregated into small particles from 20 to 500 nm. Increasing pH from 5.65 to 9.04 made the proportion of small sized nC60 of 30–100 nm (90.8% in particle number) disappear, whereas the percentage of 130–140 nm-sized particles gradually increased. Compared with the size distribution of nC60 formed in the pure water (130–150 nm in radius), a low ionic strength (IS) of 0.001 mol · L–1 promoted nC60 disaggregation and simultaneously reduced the particle size of nC60 (80–110 nm in radius). Increasing the IS to 0.01 mol˙ L–1 led to the aggregation of nC60 particles in solution with the size distribution in the range of 120–140 nm in radius. Humic acid (0 to 10 mg · L–1 promoted the formation of non-aggregated nC60 in the water, and inhibited aggregation. NOM and IS had jointly affected the size distribution of nC60. At low concentrations (5 mg · L–1 of NOM, high IS (0.1 mol · L–1) enhanced the formation of smaller nC60 particles (radius –1), the increase in IS led to disaggregation of nC60 clusters.