Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Laser ablation and fragmentation of Boron in liquids   Nanoparticles of elemental Boron are generated for the first time by laser
ablation of a sintered Boron target in liquid isopropanol and subsequent laser
fragmentation of the suspension. For this purpose an ytterbium doped fiber
laser was used at wavelength of 1060-1070 nm, pulse repetition rate of 20 kHz,
and pulse duration of 200 ns. The size of Boron nanoparticles after ablation
and fragmentation of the suspension is around 30 nm. Nanoparticles are made
mostly of Boron and carbon, some particles have carbon shell. Allotropic
composition of nanoparticles differs from that of the initial Boron target.
Possible applications are discussed.

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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
2
The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th