Computational modeling of forced flow laser chemical vapor deposition

Johnson, Ryan; Duty, Chad; Fedorov, Andrei G.; Lackey, W. J.

doi:10.1007/s00339-007-4278-0

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Thus, for each precursor, the process conditions should be carefully evaluated, to provide a reasonable MTL range and optimized growth rates. Finally, as has been previously suggested, 54,55 increasing the laser power (Q L ) to compensate for temperature losses can also help maintain operation within the MTL regime over an extended range of flow rates, allowing for even greater convective growth rate enhancements.…”

Section: Growth Simulation (Rate Versus Gas Velocity)mentioning

confidence: 92%

On “how to start a fire”, or transverse forced-convection, hyperbaric laser chemical vapor deposition of fibers and textiles

Maxwell

Webb

Bradshaw

et al. 2014

Textile Research Journal

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This work explores the transverse forced flow of precursor gases during hyperbaric pressure laser chemical vapor deposition (HP-LCVD). Axial and mass growth rates of carbon fibers are measured experimentally, and a numerical model is developed that provides fiber growth rates in both the mass-transport-limited (MTL) and kinetically limited (KL) regimes. It is found that the fiber’s transport-limited rate increases as the square root of the flow velocity, while simultaneously, the temperature drops with the inverse square root of the flow velocity. Growth is enhanced by forced flow so long as the reaction zone remains within the MTL regime; upon reaching a critical temperature and flow rate, however, fibers enter the KL regime, and the growth rate declines with rising flow rate. Molecular properties of the precursors employed and gas concentrations ultimately determine the range of the MTL and the locations of the critical temperature and flow rate. The growth rates of fibers can indeed be enhanced by transverse forced convection—to at least three times the zero-flow steady-state rate, provided an MTL regime exists. Complex three-dimensional structures may be grown from these fibers in a freeform manner, and the more rapidly such microstructures can be fabricated, the more practical HP-LCVD becomes for industrial use, including the fabrication of novel textiles.

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Section: Growth Simulation (Rate Versus Gas Velocity)mentioning

confidence: 92%

On “how to start a fire”, or transverse forced-convection, hyperbaric laser chemical vapor deposition of fibers and textiles

Maxwell

Webb

Bradshaw

et al. 2014

Textile Research Journal

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show abstract

“…The heat transfer model is therefore an effective tool for obtaining temperature profiles in laser applications [14,[17][18][19]. For example, in modelling laser chemical vapor deposition (LCVD) [20,21], temperature evolution could be simulated considering the forced convection air flow [22,23] and the effect of natural convection for both stationary and moving laser [24,25]. However, most studies of laser induced deposition focused on the reactions in a vacuum or gas based environment.…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial temperature modelling for understanding pulsed laser induced solution based nanomanufacturing

Liu

2020

Nanotechnology

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Recently, pulsed lasers have demonstrated great potential in targeted synthesis in solution based nanomanufacturing, realizing high precision and accuracy in space, time and energy input. The unique temperature history induced by pulsed lasers is indispensable to understand the related fundamentals and to realize the precision control of deposition. In this study a heat transfer model was developed and applied to predict the temporal evolution and the spatial distribution of pulsed laser induced temperature change across the reaction sites. Chemically deposited ZnO crystals were studied as an example, showing the relationships among laser parameters and heating conditions, and deposited crystal characteristics. Peak temperature and heat accumulation induced by pulsed laser were found to affect deposited crystal number density and size. The nucleation number density distribution was found to be correlated with the spatial temperature distribution and inversely proportional to the crystal size. The presented heat transfer model is a crucial tool to understand crystallization fundamentals and it is essential for facilitating pulsed laser as a new tool for research, design, manufacturing and control.

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Simulation of SiO2/S coating deposition in a pilot plant set-up for coking inhibition

Wang

Zhou

et al. 2013

Chemical Engineering Research and Design

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Computational modeling of forced flow laser chemical vapor deposition

Cited by 5 publications

References 16 publications

On “how to start a fire”, or transverse forced-convection, hyperbaric laser chemical vapor deposition of fibers and textiles

On “how to start a fire”, or transverse forced-convection, hyperbaric laser chemical vapor deposition of fibers and textiles

Temporal and spatial temperature modelling for understanding pulsed laser induced solution based nanomanufacturing

Simulation of SiO2/S coating deposition in a pilot plant set-up for coking inhibition

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