Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solid Lubrication with MoS$_2$: A Review   Molybdenum disulfide (MoS$_2$) is one of the most broadly utilized solid
lubricants with a wide range of applications, including but not limited to
those in the aerospace/space industry. Here we present a focused review of
solid lubrication with MoS$_2$ by highlighting its structure, synthesis,
applications and the fundamental mechanisms underlying its lubricative
properties, together with a discussion of their environmental and temperature
dependence. An effort is made to cover the main theoretical and experimental
studies that constitute milestones in our scientific understanding. The review
also includes an extensive overview of the structure and tribological
properties of doped MoS$_2$, followed by a discussion of potential future
research directions.

18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph