Abstract
Laser-synthesized silicon powder with an average size of 0.28 {mu}m was colloidally pressed into disks 1.27 cm in diameter using various solvents. Thermogravimetric analysis (TGA) was performed during the solvent removal at various temperatures. Two types of weight loss were observed: one proportional to time, t, indicating that external mass transfer is the rate-limiting step, and the other proportional to t{sup 1/2}, indicating that pore diffusion is the rate-determining step. After losing > 99% of the solvent weight, samples were examined by Fourier transform ir spectroscopy to determine the amount of solvent that remained adsorbed on the surface of the silicon powder as a function of time for various temperatures. Temperatures much higher than the boiling points of the solvents are required to completely dry the silicon compacts.
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