Modeling, simulation, and experiments of coating growth on nanofibers

This work is a comparison of modeling and simulation results with experiments for an integrated experimental/modeling investigation of a procedure to coat nanofibers and core-clad nanostructures with thin film materials using plasma enhanced physical vapor deposition. In the experimental effort, ele...

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Bibliographic Details
Published in:Journal of applied physics 2008-02, Vol.103 (4), p.044304-044304-14
Main Authors: Clemons, C. B., Hamrick, P., Heminger, J., Kreider, K. L., Young, G. W., Buldum, A., Evans, E., Zhang, G.
Format: Article
Language:English
Subjects:
COATINGS
CRYSTAL GROWTH
EQUATIONS
FIBERS
MATERIALS SCIENCE
MATHEMATICAL EVOLUTION
MORPHOLOGY
NANOSTRUCTURES
PHYSICAL VAPOR DEPOSITION
PLASMA
POLYMERS
POROSITY
SIMULATION
SURFACES
THIN FILMS
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Summary:This work is a comparison of modeling and simulation results with experiments for an integrated experimental/modeling investigation of a procedure to coat nanofibers and core-clad nanostructures with thin film materials using plasma enhanced physical vapor deposition. In the experimental effort, electrospun polymer nanofibers are coated with metallic materials under different operating conditions to observe changes in the coating morphology. The modeling effort focuses on linking simple models at the reactor level, nanofiber level and atomic level to form a comprehensive model. The comprehensive model leads to the definition of an evolution equation for the coating free surface around an isolated nanofiber. This evolution equation was previously derived and solved under conditions of a nearly circular coating, with a concentration field that was only radially dependent and that was independent of the location of the coating free surface. These assumptions permitted the development of analytical expressions for the concentration field. The present work does not impose the above-mentioned conditions and considers numerical simulations of the concentration field that couple with level set simulations of the evolution equation for the coating free surface. Further, the cases of coating an isolated fiber as well as a multiple fiber mat are considered. Simulation results are compared with experimental results as the reactor pressure and power, as well as the nanofiber mat porosity, are varied.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2840137