Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crystallisation From Volatile Deep Eutectic Solvents   A new class of deep eutectic solvents are presented where one component of
the system is inherently volatile, enabling a premeditated, auto-destructive
capability which leads inexorably to a series of novel crystal structures.
These volatile deep eutectic solvents are easily-formed liquids with a greatly
depressed melting point and exhibit all of the physical characteristics of
classical deep eutectic solvents, with the exception that the hydrogen-bond
donor component is volatile when exposed to the atmosphere at room temperature.
We demonstrate the effectiveness of this concept through the exquisite control
of pharmaceutical polymorphism, among which is a more efficacious form of
acetaminophen, which can be formed spontaneously for the first time at room
temperature.

1
The categories of this paper are: cs
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn