| The nucleation of the phase separation is experimentally investigated in the organic, monotectic alloy, succinonitrile-water, in a temperature range far from the critical temperature. An experimental technique is developed to contain droplets of the binary alloy within an emulsion and subsequently control the undercooling to nucleation of the phase separation, eutectic and monotectic reactions.; Differential Scanning Calorimetry (DSC) is used to locate and measure the temperature and undercooling to nucleation of the phase transformations; the mixing and unmixing of the phase separation and the monotectic and eutectic reactions.; The undercooling of the phase separation is found to scale with the equilibrium consolute temperature while the relative undercooling is found to be a constant. The monotectic reaction and pure succinonitrile are found to undercool more than previously reported in the literature.; The undercooling data is transformed into isothermal supersaturation data. This data compares favorably with the qualitative predictions of scaled nucleation theory and dimensionless classical nucleation theory. Quantitative predictions of the barrier to nucleation and the interfacial energy cannot be calculated with only the supersaturation data. However, classical nucleation theory and the capillarity approximation underestimates the interfacial energy and overestimates the barrier to nucleation. |
