Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Order/disorder dynamics in a dodecanethiol-capped gold nanoparticles
  supracrystal by small-angle ultrafast electron diffraction   In metal nanoparticles (NPs) supracrystals, the metallic core provides some
key properties, e.g. magnetization, plasmonic response or conductivity, with
the ligand molecules giving rise to others like solubility, assembly or
interaction with biomolecules. The formation of these supracrystals depends on
a complex interplay between many forces, some stemming from the core, some from
the ligands. At present, there is no known approach to characterize the local
order of ligand molecules or their dynamics with atomic spatial resolution.
Here, we develop a methodology based on small-angle ultrafast electron
diffraction combined with angular cross-correlation analysis to characterize a
two-dimensional supracrystal of dodecanethiol-coated gold NPs. We retrieve the
static arrangement of the ligands, showing that at equilibrium they order in a
preferential orientation on the NPs surface and throughout the two-dimensional
supracrystal. Upon light excitation, positional disorder is induced in the
supracrystal, while its overall homogeneity is surprisingly found to
transiently increase. This suggests that transient annealing of the
supracrystal takes place within few picoseconds (ps). This methodology will
enable the systematic investigation of the dynamical structural properties of
nano-assembled materials containing light elements, relevant for biological
applications.

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The categories of this paper are: bayes-an
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph