Degree of supercooling

An interesting point is that AH itself varies with r [10].] As is the case when P is varied, the rate of nucleation increases so strongly with the degree of supercooling that a fairly sharp critical value exists for T. Analogous equations can be written for the supercooling of a melt, where the heat of fusion AH/ replaces AH . 

Another important point in connection with the rate of nuclei formation in the case of melts or of solutions is that the rate reaches a maximum with degree of supercooling. To see how this comes about, is eliminated between Eq. IX-6 and the one for liquids analogous to Eq. IX-13, giving... 

Isothermal crystallization was carried out at some range of degree of supercooling (AT = 3.3-14 K). AT was defined by AT = T - Tc, where Tj is the equilibrium melting temperature and Tc is the crystallization temperature. T s was estimated by applying the Gibbs-Thomson equation. It was confirmed that the crystals were isolated from each other by means of a polarizing optical microscope (POM). 

Time evolutions of Ix 0bs(< >t) of the mixture of PE with NA and that of PE without NA are shown in Figs. 7 and 8, respectively. They were observed at the same degree of supercooling AT as the optical observation shown in Fig. 6. The induction time observed by optical microscopy (ti(OM)) was... 

The initial lamellar thickness (L) depends on the degree of supercooling AT (= r —Tc, where T is the equihbrium melting temperature and Tc is the... 

Water-quenched mixtures crystallising at very extensive degrees of supercooling displayed only one melting peak and one small-angle X-ray scattering peak, which was taken as evidence of co-crystallisation of the components. 

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