Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Restructuring in bimetallic core-shell nanoparticles: Real time
  observation   The formation process of core-shell bimetallic nanoparticles synthesized by
sputtering onto a substrate is observed in real time using an originally
developed acoustic technique. The technique enables us to evaluate the
structural change of nanoparticles at room temperature without contacting the
nanoparticles or substrate. In the experiments, the sputtering of metal A
followed by metal B tended to form B-shell/A-core nanoparticles. However, in
Pd-Au alloy system, notable restructuring occurred during synthesis, resulting
in the formation of A-shell/B-core nanoparticles. The formation process is
analyzed using the molecular dynamics simulation, revealing that this
restructuring occurs on a short timescale, and high diffusivity of Au plays an
important role.

10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph