According to the classical nucleation
theory, the free energy of homogeneous nucleation
is can be expressed as [DELTA][G.sup.*.sub.hom] = 16[pi][gamma]/3([DELTA][P.sup.2]), and the free energy of heterogeneous nucleation
is can be expressed as [DELTA][G.sup.*.sub.het] = 16[pi][gamma]/3([DELTA][P.sup.2])f ([theta][omega].
The prediction of the IN concentration in the model is very complex and difficult due to the lack of understanding of the relative importance of the four heterogeneous ice crystal nucleation
Homogeneous and Heterogeneous Nucleation
. Freezing nucleation
can be divided into homogeneous nucleation
and heterogeneous nucleation
Since the nucleation
of austenite transformation remains with the site saturation nucleation
, it can be assumed that the nucleation
has been completed when the growth begins.
2010); instruments capable of measuring all modes of the ice nucleation
cycle, including techniques for measuring tropospheric water vapor concentration (Neely and Thayer 2011); methods of characterizing the structure of ice in clouds (Carr et al.
The barrier energy for heterogeneous nucleation
is not reached by small amounts of cooling energy at these temperatures.
The XRD patterns (figure 3) of the nucleation
side of the D1 and D2 films clearly show crystalline diamond phase.
Then the experimental results compared with the classical nucleation
effect and thermal behavior of bisamides compound with different methylene chain and develop more bisamides type nucleation
agent for PLLA, N, N'-Bis(benzoyl) tridecanedioic acid dihydrazide(NA) was synthesized, and the nucleation
effect and thermal behavior of bisamides compound NA as nucleating agent for PLLA was evaluated by using DSC, POM and WAXD.
In addition to the dependence of the nucleation
efficiency of these four modes on temperature and relative humidity, there is also a dependence on the physical and chemical properties of the surfaces of the ice nuclei that facilitates ice embryo formation (Pruppacher and Klett, 1997; DeMott et al., 2011).
We also found that the nucleation
time of hydrogen bubble was larger than the growth time, which means that the nucleation
process is the key factor during the whole process of hydrogen bubble evolution.
whereas for a constant nucleation
rate per unit of volume, [I.sub.V],