Coalescence kinetics of unequal sized nanoparticles

Hawa, Takumi; Zachariah, Michael R.

doi:10.1016/j.jaerosci.2005.02.007

Cited by 127 publications

(89 citation statements)

References 58 publications

(51 reference statements)

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“…Coagulation and aggregation are competing processes, the ratio of coalescence and collision time determines their relative dominance (Hawa and Zachariah, 2006):…”

Section: Discussionmentioning

confidence: 99%

Microphysical properties of carbonaceous aerosol particles generated by laser ablation of a graphite target

et al. 2015

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Abstract. In this work various microphysical properties including mass concentration, size distribution and morphology of aerosol particles generated by laser ablation of a high purity graphite sample were investigated in detail. Supplementary chemical analysis of the generated particles including microstructure investigation by high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy were also made. These measurements proved that the proposed method can be used to model the real atmospheric carbonaceous particulate under various climate relevant conditions regarding its specific properties investigated here. However, to introduce the presented methodology as a novel BC surrogate, further improvement and investigation including simplification in experimental setup, comprehensive analysis of thermochemical refractiveness and optical responses of the generated particles as well as comparative study with the presently available concurrent surrogates are required. The related results of these issues are planned to be demonstrated in other studies.

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“…Coagulation and aggregation are competing processes, the ratio of coalescence and collision time determines their relative dominance (Hawa and Zachariah, 2006):…”

Section: Discussionmentioning

confidence: 99%

Microphysical properties of carbonaceous aerosol particles generated by laser ablation of a graphite target

et al. 2015

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“…Since surface diffusion is dominant in coalescence, it can occur without the clusters being molten . For unequal sized nanoparticles, MD simulation (Hawa and Zachariah, 2006) showed that the coalescence processes become faster when the ratio of two particle sizes (smaller/larger) approaches zero and the coalescence time of two unequal sized nanoparticles can be predicted by the Koch-Friedlander model. Koch and Freidlander (1990) generalized the Smoluchowski equation to incorporate the coalescence rate into the aerosol dynamic.…”

Section: Introductionmentioning

confidence: 99%

Generation of nanoparticles by spark discharge

et al. 2008

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“…10,12) The features observed in Fig. 4 probably indicate that small clusters of Ti and Cr atoms experienced a collision and subsequent coalescence, and grew to big particles during the EWE process.…”

Section: Resultsmentioning

confidence: 97%

“…7) It has been reported that the collision and subsequent coalescence of primary particles play an important role in the formation of nanoparticles in the gas phase after nucleation. 10) A molecular dynamics simulation study has shown that the coalescence of nanoparticles happens so rapidly and gives rise to a strain in atoms near the void.…”

Section: Resultsmentioning

confidence: 99%

Microstructure of Ti-Cr Nanoparticles Prepared by Electrical Wire Explosion

et al. 2011

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The reaction products of electrical wire explosion with 25 at% Cr-coated Ti wire were identified as -TiCr 2 , -Ti, (Ti,Cr) and -TiCr 2 based on the selected area electron diffraction patterns. There was a bimodal size distribution where Ti-Cr particles were 40-50 nm in size, and fine particles less than 10 nm were determined to be pure Ti or Cr. The Ti-Cr nanoparticles are not only a mixture of Ti-Cr phases but they are also heterogeneous themselves at a single particle level, due to the non-equilibrium effects of the EWE process. The very rapid collision and subsequent coalescence of Ti and Cr atom clusters are believed to have contributed to the formation of chemically segregated particles.

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Coalescence kinetics of unequal sized nanoparticles

Cited by 127 publications

References 58 publications

Microphysical properties of carbonaceous aerosol particles generated by laser ablation of a graphite target

Microphysical properties of carbonaceous aerosol particles generated by laser ablation of a graphite target

Generation of nanoparticles by spark discharge

Microstructure of Ti-Cr Nanoparticles Prepared by Electrical Wire Explosion

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