Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of nanoparticles of phtalocyanines by laser fragmentation and
  their interaction with gold nanoparticles   Optical properties and morphology of laser generated Aluminum and Copper
phthalocyanine nanoparticles (nAlPc and nCuPc) in water are experimentally
studied. Near infrared laser source of nanosecond pulse duration was used for
fragmentation of Pc micro-powder suspended in H2O. Extinction spectra in the
visible and near IR range of NPs colloidal solutions in MQ water were acquired
by means of optical spectroscopy. The optical density of both nCuPc and nAlPc
increases with laser fragmentation time. Transmission electron microscopy was
used for characterization of nanoparticle morphology and size analysis. It is
found that nCuPc are made of short (100 nm) rectangular bars interconnected at
various angles with other bars. Similar experiments were carried out for a
colloidal solution, which is a mixture of Au and AlPc nanoparticles. It turned
out that Au NPs in presence of nAlPc form large agglomerates of Au.

11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
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The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int