Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Active gels: from chemical microreactor to polymeric actuator   We report on a new synthesis protocol, experimental characterization and
theoretical modeling of Belousov-Zhabotinsky (BZ) hydrogels. BZ gels combine
the ability to convert chemical energy into actuation with a sensing
capability. Our new two-step synthesis technique allows independent
optimization of the chemical and the mechanical properties of BZ gels. We
demonstrate that the strain of these BZ gels can be made arbitrarily large by
decreasing their bulk modulus, an important result for the design of
shape-changing hydrogels. In addition to strain, we argue that the stress
developed by BZ gels is a better metric for assessing the utility of a given
gel for chemomechanical energy conversion. We highlight the role of the
surrounding media for the occurrence of hydrogel oscillation, which is
determined by the Damkohler number, the ratio of chemical reaction to diffusion
rates. These experimental findings are supported by a Flory-Huggins theory for
polyelectrolyte gels coupled to a Vanag-Epstein model of BZ chemistry.

22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol