The excess heat capacities were measured as a function of temperature on a MicroCal VP-differential scanning calorimeter (MicroCal LLC). In a typical differential scanning calorimetry (DSC) experiment,boththereferenceandsamplechamberswereinitially filled with buffer solutions. The solutions were equilibrated and then scanned within the required temperature range at a scan rate of 50 K h1. The buffer scans were repeated until reproducible base lines were obtained (noise specification