Platinum black sinters for heat exchangers at very low temperatures

We have investigated a series of Pt black sinters for use as heat exchangers to cool liquid or solid helium to temperatures below 1 mK. They had thicknesses between 60 and 80 μm and specific surface areas up to 39.7 m 2/g and 304 m 2/cm 3. The sintering was on highly polished Cu surfaces of 12.7×15....

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