Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusion-induced spontaneous pattern formation on gelation surfaces   Although the pattern formation on polymer gels has been considered as a
result of the mechanical instability due to the volume phase transition, we
found a macroscopic surface pattern formation not caused by the mechanical
instability. It develops on gelation surfaces, and we consider the
reaction-diffusion dynamics mainly induces a surface instability during
polymerization. Random and straight stripe patterns were observed, depending on
gelation conditions. We found the scaling relation between the characteristic
wavelength and the gelation time. This scaling is consistent with the
reaction-diffusion dynamics and would be a first step to reveal the gelation
pattern formation dynamics.

22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th