Exotherm dependence on batch size: (a) 0.269 g, (b) 0.464 g, (c) 1.223 g, (d) 2.259 g batches.
Exotherm dependence on batch size and bed thickness: (a) 4 mm bed, 6.93 g batch; (b) 8 mm bed, 7.71 g batch; (c) 16 mm bed, 14.1 g batch.
FTIR absorption spectra: (a) as-anodized and (b) after E1, (c) after E2, and (d) after E3.
Signal detected due to silanes/hydrogen on ramping porous silicon powder in static air (lowest sensitivity equivalent to strongest signal).
Exotherm emission of visible radiation during ramp-up to 800 °C (thermocouple probe in position; exotherm onset and peak at 720 °C and 962 °C, respectively; image taken just after onset, at powder temperature of approximately 850 °C).
Exotherm parameters for porous silicon powder oxidized using a (74 × 14 × 10) mm3 quartz crucible with 8 mm bed thickness (properties before oxidation: D10 = 4 μm, D50 = 24 μm, D90 = 86 μm, surface area = 318 m2/g, pore volume = 0.766 ml/g, average pore size = 10 nm; E1–E4 refer to exotherms observed).
Comparison of physical properties of powders with different bed thicknesses, after ramping to 800 °C in 110 min.
Evolution of physical properties in relation to exotherm occurrence (E1-E3 refer to exotherms observed).
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