Volume 98, Number 6, June 2012
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||10 July 2012|
Growth of fractal structures in flames with silicon admixture
Joint Institute for High Temperatures of RAS - 13, bldg. 2 Izhorskaya str., Moscow, 125412, Russia
2 Department of Applied Physics, Zernike Institute for Advances Materials, University of Groningen Nijenborgh 4, 9747 AG Groningen, The Netherlands, EU
3 DNV KEMA Energy & Sustainability, Nederland B.V. - P.O. Box 2029, 9704 CA Groningen The Netherlands, EU
4 Laboratory for High Temperature Energy Conversion Processes, University of Groningen Nijenborgh 4, 9747 AG Groningen, The Netherlands, EU
Received: 5 May 2012
Accepted: 2 June 2012
Transmission electron microscopy (TEM) measurements and theoretical analysis are combined to construct the physical picture of formation of SiO2 fractal aggregates in a methane/hexamethyldisiloxane/air atmospheric pressure flame. The formation of SiO2 fractal aggregates is described as a multistage process. The first stage is combustion of fuel in a narrow flame front region with formation of main combustion products including SiO2 molecules. Further downstream SiO2 molecules join in liquid nanoclusters. After cooling combustion products due to heat losses to surroundings, the nanoclusters become solid in a cold flame region and join in fractal aggregates there. Along with growth of fractal aggregates, the restructuring process proceeds in a cold flame region that leads to the decrease of the fractal dimension of fractal aggregates. The measured parameters of fractal aggregates are in accord with those followed from theoretical models.
PACS: 61.43.Hv – Fractals; macroscopic aggregates (including diffusion-limited aggregates) / 82.33.Vx – Reactions in flames, combustion, and explosions / 61.43.-j – Disordered solids
© EPLA, 2012
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