화학공학소재연구정보센터
Powder Technology, Vol.339, 273-280, 2018
On the separation of particle flow during pulse laser deposition of heterogeneous materials - A multi-fractal approach
The problem of plasma self-structuring during the pulse laser deposition of multicomponent materials is discussed from both theoretical and experimental perspectives. A non-differential mathematical model was used to build the set of equation to characterize a complex fluid, assimilated with the laser produced plasmas in the fractal paradigm. Numerical simulations regarding the flow of a fractal fluid were performed reflecting real multi-component plasmas. These revealed that the structuring of a fluid is strongly related to its fractality and thus to individual properties of its components. The theoretical results were confronted with experimental data regarding the flow of multi-component plasma in a fluid representation. The laser produced plasma was investigated by means of ICCD fast camera imaging and optical emission spectroscopy. The experimental results showcase a splitting process on the two main directions coupled with a separation of the ejected particles with respect to their excitation energy. Both theoretical and experimental data are in good agreement. (C) 2018 Elsevier B.V. All rights reserved.