Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling of nanoparticle coatings for medical applications   Gold nanoparticles (AuNPs) have been shown to possess properties beneficial
for the treatment of cancerous tumors by acting as radiosensitizers for both
photon and ion radiation. Blood circulation time is usually increased by
coating the AuNPs with poly(ethylene glycol) (PEG) ligands. The effectiveness
of the PEG coating, however, depends on both the ligand surface density and
length of the PEG molecules, making it important to understand the structure of
the coating. In this paper the thickness, ligand surface density, and density
of the PEG coating is studied with classical molecular dynamics using the
software package MBN Explorer. AuNPs consisting of 135 atoms (approximately 1.4
nm diameter) in a water medium have been studied with the number of PEG ligands
varying between 32 and 60. We find that the thickness of the coating is only
weakly dependent on the surface ligand density and that the degree of water
penetration increased when there is a smaller number of attached ligands.

25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga