A remarkable elevation of freezing temperature of CCl4 in graphitic micropores

The freezing behavior of CCl4 confined in graphitic micropores of activated carbon fibers (ACFs) was examined by use of differential scanning calorime try over the temperature range of 180 to 320 K. For ACF of average pore wid th, w = 1.1 nm, we observed a clear peak showing that the freezing temperat ure is 299 K. The freezing temperature was elevated by 57 K, However, the e nthalpy of freezing was only 1.0% of that of the bulk liquid CCl4 to an fee solid phase. CCl4 confined in micropores of w = 0.80 nm had a more diffuse DSC peak, providing a similar elevation of the freezing temperature and an even smaller freezing enthalpy of 0.5% of the bulk value.