Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Imaging of Contacts and Forces in Colloidal Gels   Colloidal dispersions are prized as model systems to understand basic
properties of materials, and are central to a wide range of industries from
cosmetics to foods to agrichemicals. Among the key developments in using
colloids to address challenges in condensed matter is to resolve the particle
coordinates in 3D, allowing a level of analysis usually only possible in
computer simulation. However in amorphous materials, relating mechanical
properties to microscopic structure remains problematic. This makes it rather
hard to understand, for example, mechanical failure. Here we address this
challenge by studying the contacts and the forces between particles, as well as
their positions. To do so, we use a colloidal model system (an emulsion) in
which the interparticle forces and local stress can be linked to the
microscopic structure. We demonstrate the potential of our method to reveal
insights into the failure mechanisms of soft amorphous solids by determining
local stress in a colloidal gel. In particular, we identify `force chains' of
load-bearing droplets, and local stress anisotropy, and investigate their
connection with locally rigid packings of the droplets.

32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an