Active Sites and Ice Crystal Nucleation.

@article{Fletcher1969ActiveSA,
  title={Active Sites and Ice Crystal Nucleation.},
  author={Neville H. Fletcher},
  journal={Journal of the Atmospheric Sciences},
  year={1969},
  volume={26},
  pages={1266-1271}
}
  • N. Fletcher
  • Published 1 November 1969
  • Physics, Materials Science
  • Journal of the Atmospheric Sciences
Abstract The concept of active nucleation sites is examined in the light of standard nucleation theory and it is suggested that these sites are probably small re-entrant corners or jogs in growth steps on the surface of the nucleating particle. The nucleation behavior of a spherical particle with a conical pit on its surface is examined in detail and the activity of a population of particles having a log-normal distribution of such pits is worked out. The parameters involved in the theory can… 
Observing the formation of ice and organic crystals in active sites
TLDR
The role of surface topography in promoting crystallization of ice and different organic crystals is investigated and it is shown that acute geometries are highly effective in promoting the growth of a confined crystalline phase, which then gives rise to a bulk phase.
Phenomenological theory of ice nucleation on particles with inhomogeneous surface and its verification
Various paper~ demonstrated a need for the account of active sites of ice-forming particle surface in the explanation of the peculiarities of heterogeneous ice nucleation° A test of the Fletcher
On topography and crystal nucleation
The influence of topography on crystal nucleation is investigated, mostly with regards to nucleation from vapour but also regarding nucleation from the melt and from solution. Two mechanisms are
Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle
Abstract. Deposition nucleation on two mineral species, kaolinite and illite, was studied using a flow cell coupled to an optical microscope. The results show that the S ice conditions when ice first
Crystal Nucleation without Supersaturation.
TLDR
The first experimental demonstration of a two-step mechanism that facilitates deposition of crystals on solid surfaces from vapor that occurs from saturated vapor without the need for supersaturation, conditions that, according to CNT, cannot lead to direct deposition ofstals from vapor.
Ice nucleation on BaF2(111).
TLDR
Calculations consistent with the experimental results demonstrate that the pitting of a submerged BaF(2) crystal dramatically improves its ice nucleating ability.
Characterization of Preferred Crystal Nucleation Sites on Mica Surfaces
Rates of heterogeneous nucleation can be greatly increased not only through control of the chemistry of a surface, but also of its topography. Following previous work in which we showed that
Topographical Control of Crystal Nucleation
Surface topography is here investigated as a route to controlling crystal nucleation. The nucleation from vapor of crystals of neo-pentanol and tetrabromomethane was studied on flat surfaces of glass
...
1
2
3
4
5
...