Measurements of heterogeneous nucleation of several different compounds on different composition nuclei have shown several distinct patterns of nucleation and growth. Some of the specific behaviors for condensation activation of heterophilic (energetically nonuniform) aerosol nanoparticles have been theoretically analyzed based on a model of double-barrier nucleation (DBN) with an emphasis on scale and supersaturation effects. A new "semiempirical" method for collecting nucleation data from the condensation size spectrum of CN was developed. These results have been used to provide a qualitative interpretation of experimental data on the transformation of the initial size distribution spectrum of nanoparticles in a turbulent mixing condensation nuclei counter.
It is now well established that in the gel-fluid phase coexisting region of bilayers made of two mixed
phospholipids, one of the phases is microdispersed in the other. On the basis of data obtained with fluorescence
recovery after photobleaching for 1,2-dimyristoyl-sn-glycero-(3)-phosphocholine/1,2-distearoyl-sn-glycero-(3)-phosphocholine (DMPC/DSPC) mixtures, the linear dimension of the rigid domains for small rigid phase
fractions was predicted to be 2−3 μm (Coelho, F. P. ; Vaz, W. L. C.; Melo, E. Biophys. J.
1997, 72, 1501)
and therefore, much smaller than the domains obtained with monolayers with identical composition. Recent
“nanoscopic” observations confirmed that this was a reasonable estimate. In this work, we explain this difference
in dimension, ascribing it to the interaction of the polarized surface of the two opposing domains pertaining
to the two bilayer leaflets. It is shown that the geometry of the rigid structures formed is strongly dependent
on the bilayer core dielectric permittivity. It is also found that in bilayers a circular to elliptic shape transition,
similar to the one predicted for monolayers, is to be expected.
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