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- W1990688997 abstract "The incorporation of desired “dopant” elements (or compounds) in deposited materials is influenced by coupled transport phenomena and cannot be predicted based on chemical thermodynamics alone. As an important example, we consider the deposition of doped glass for use as optical waveguides. In this technology, combustion products heavily laden with SiO2-rich submicron droplets are passed over a slowly rotating surface which thermophoretically captures the microdroplets. The dopant (e.g. GeO2, P2O5, B2O3 content of these microdroplets, which dictates the local refractive index distribution within the ultimate waveguide product, must be carefully controlled and it is necessary to understand these processes theoretically. This paper systematically developes a fully coupled, pseudo-single-phase laminar boundary layer theory capable of predicting deposit compositions as a function of the feedstream loading of silicon precursor and the dopant (here Ge precursor), as well as the substrate temperature. It is shown that it is not permissible to neglect the effects of silica particle mass loading or even the heat of GeO2 condensation. The principal assumptions, defensible under typical optical waveguide deposition process conditions, are that the silica-rich microdroplets are in local dynamic, thermal and chemical equilibrium with the prevailing high-temperature vapor mixture, through which they drift primarily as a result of (particle size insensitive) thermophoresis. As a by-product of the physicochemical—mathematical model and calculations the structure of the dopant vapor boundary layer is obtained, and hence the decisive ratio of the dopant vapor number density established at the wall to that in the equilibrium mainstream. The capability of predicting both the rate of glass microparticle deposition and deposit composition (e.g. the dopant/Si element ratio) for each feed condition and wall/combustion gas temperature ratio should provide a valuable insight into the optimization and improvement of such processes. Moreover, while illustrated here for the case of a single dopant (e.g. Ge), the methods are readily extended to multi-element deposition from mist-laden gases." @default.
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- W1990688997 date "1989-01-01" @default.
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- W1990688997 title "Multiphase continuum theory of dopant redistribution across aerosol-laden laminar nonisothermal boundary layers" @default.
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- W1990688997 doi "https://doi.org/10.1016/0009-2509(89)85037-7" @default.
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