In situ measurement of the fractal dimensionality of ultrafine aerosol particles
In situ measurement of the fractal dimensionality of ultrafine aerosol particles
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超细气溶胶颗粒分形维数的原位测量
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
A. Schmidt
中科院分区：
文献类型：
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作者：
A. Schmidt
首次在现场测量了气相团聚颗粒的分形维数df。这是通过比较空气动力学半径R0和Rc1前后回火。通过回火，团块坍塌成df=3的紧密堆积的团块。结果表明，方程M ~ Rdf0，其中M是团块质量，几乎可以保持到R0=Rc1 =Rm（单体半径），使df成为气溶胶表征的一个非常有用的量。测量结果表明，对于Rm为≂7.5 nm的银团块，df为≂2.18，df与材料有关。
The fractal dimension df of gas phase agglomerated particles is measured in situ for the first time. This is done by comparing aerodynamic radii R0 and Rc1 before and after tempering. By tempering, agglomerates are collapsed into close‐packed clusters of df=3. It is shown that the equation M∼Rdf0, where M is the agglomerate mass, holds almost down to R0=Rc1 =Rm (monomer radius), making df a very useful quantity for aerosol characterization. The measurement yields df≂2.18 for Ag agglomerates with Rm≂7.5 nm. df is predicted to be material dependent.