Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 3D-mesostructures obtained by self-organization of metallic nanowires   The architecture of novel metallic mesostructures obtained via
self-organization of growing nanowires has been investigated. Seashell, fungus
and lotus leafshaped structures are reproducibly formed by programmable pulse
current electrodeposition on porous membranes. The samples several millimeters
in size are obtained. SEM investigation has revealed that the frame of the
metallic seashell presents a hierarchical system with elements of fractal
selfsimilarity at the nano- and microlevels. The frame is a volumetric
multilayer net with conical bundles of nanowires as building blocks. The Pd-Ni
nanowires have V-like branches and periodic bulges . TEM study showed that the
nanowires consist of nanocrystallites dispersed in an amorphous matrix. Their
sizes range from 4 to 15 nm. Local inhomogeneity of PdNi solid solution was
observed. In perspective, the proposed technique can be used as a 3D printer
for the purposeful synthesis of novel materials with complex quantum
nano-architecture.

11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th