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Diffractive feature formation on metal

Suggested palette of box colours – for use if required and to be sized as required. Diffractive feature formation on metal. Marcus Ardron. Marangoni effect: surface tension due to thermal gradient. Where: σ = surface tension h = length in temp. grad. η = viscosity

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Diffractive feature formation on metal

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  1. Suggested palette of box colours – for use if required and to be sized as required Diffractive feature formation on metal Marcus Ardron • Marangoni effect: surface tension due to thermal gradient Where: σ = surface tension h = length in temp. grad. η = viscosity α = thermal diffusivity ΔT = temp. difference Single feature made on polished stainless steel surface Thermo-capillary motion: buoyancy, density changes, thermal currents The quantity that must be harnessed Chemi-capillary motion: diffusion across surface, chemical reactions 304 stainless steel processed in CO2 Periodic structure formed in plated surface Balandin et al. J Appl Phys 78(3) 1995 2037-2044 Nink et al. Appl Surf Sci 138-139 (1999) 439-443 Period of 8μm Height excursion of ≈125nm Sim & Kim. Int J Heat Mass Tran 48(2005) 1137-1144 t = non-dimensional time

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