Damping of Solute Convection During Crystal Growth by Applying Magnetic Field Gradients

概要

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One of the advantages of crystal growth under microgravity conditions is the damping of solute convection that affects crystal quality. The mechanism of the dampening effect of magnetic field gradients, $B(dB/dz)$, on solute convection was studied, and the magnitude of $B(dB/dz)$ required for dampening was calculated. When the absolute value of mass magnetic susceptibility, $\chi_{\text{g}}$, of a solute is about 70% of that of a solvent (e.g., KCl crystal growth from an aqueous solution) and the weight ratio is 0.26, the gradient to damp convection considerably is estimated to be $-3018$ T2/m. On the other hand, when the $\chi_{\text{g}}$ of the solute is nearly equal to that of the solvent [protein crystal growth (lysozyme)], a gradient of $-1394$ T2/m damps convection completely on the earth.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2005-06-10