Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Facile fabrication of asymmetric surfaces via mechanochemistry   We demonstrate a mechanochemical approach to fabrication of a bidirectional
surface on a doped silicon wafer. In the initial step of our fabrication
procedure, a high-density polyethylene (HDPE) stylus is pressed and drawn on
the Si surface. This rubbing action provides a mechanochemical treatment of the
Si surface, which unexpectedly alters the etching direction in the subsequent
metal-assisted chemical etching step. Hence, Si nanowires of two different
orientations can be patterned conveniently by a rub-write step. The mechanism
of bidirectional Si nanowire formation is investigated. This anisotropy is
exploited to propel water droplets on a fluidic track.

14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess