Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metastability limit for the nucleation of NaCl crystals in confinement   We study the spontaneous nucleation and growth of sodium chloride crystals
induced by controlled evaporation in confined geometries (microcapillaries)
spanning several orders of magnitude in volume. In all experiments, the
nucleation happens reproducibly at a very high supersaturation S~1.6 and is
independent of the size, shape and surface properties of the microcapillary. We
show from classical nucleation theory that this is expected: S~1.6 corresponds
to the point where nucleation first becomes observable on experimental time
scales. A consequence of the high supersaturations reached at the onset of
nucleation is the very rapid growth of a single skeletal (Hopper) crystal.
Experiments on porous media reveal also the formation of Hopper crystals in the
entrapped liquid pockets in the porous network and consequently underline the
fact that sodium chloride can easily reach high supersaturations, in spite of
what is commonly assumed for this salt.

17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg