Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In-situ liquid SAXS studies on the early stage of calcium carbonate
  formation   Calcium carbonate is a model system to investigate the mechanism of solid
formation by precipitation from solutions, and it is often considered in the
debated classical and non-classical nucleation mechanism. Despite the great
scientific relevance of calcium carbonate in different areas of science, little
is known about the early stage of its formation. We, therefore, designed
contactless devices capable to provide informative investigations on the early
stages of the precipitation pathway of calcium carbonate in supersaturated
solutions using classical scattering methods such as Wide-Angle X-ray
Scattering (WAXS) and Small-Angle X-ray Scattering (SAXS) techniques. In
particular, SAXS was exploited for investigating the size of entities formed
from supersaturated solutions before the critical conditions for amorphous
calcium carbonate (ACC) nucleation are attained. The saturation level was
controlled by mixing four diluted solutions (i.e., NaOH, CaCl2, NaHCO3, H2O) at
constant T and pH. The scattering data were collected on a liquid jet generated
about 75 sec after the mixing point. The data were modeled using parametric
statistical models providing insight about the size distribution of denser
matter in the liquid jet. Theoretical implications on the early stage of solid
formation pathway are inferred.

27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con