Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The properties and the structure of colloid agregates of the silver
  besilcate Ag6Si2O7 in water medium   The paper describes the investigation of the properties of silver besilicate
salt colloids in water medium. Ag6Si2O7 was obtained in a soft conditions, in
water medium, at temperatures and pressure close to room ones. The morphology
and crystallinity of matter under investigations appear to depend on the growth
conditions. Slow growth resulted in quasi-crystalline yellowish whiskers, while
high concentration of precursors led to fast formation of the quasi-amorphous
aggregates. The elemental constitution of object under study was determined
with the help of Comebax-INCA set-up, and was then proved by chemical analysis.
The ratio of elements was close to Ag6Si2O7, and depended a little whether the
sample was taken from the sediments of reaction or from dried residue of a
liquid medium. The experiments in Raman technique revile several
well-resolvable bands in whisker-like samples, but only few of them were able
to detect in quasi-amorphous material. In the last case the bands were broader,
but the positions of weak broad bands were close to the positions of
corresponding bands in whiskers. We can suggest, that the bands, common in two
former cases, are due to oscillation in bepyramidal molecules of Ag6Si2O7, and
the bands, seen only at whiskers, are due to long-rang order. The very special
peculiarity was observed under chemical test with hydrochloric acid. The white
flakes sedimentation appeared after addition of NaCl but do not appeared when
HCl was added. This result can be explained if to assume the existence of
silicon acid shell around the colloidal particles of silver besilicate. The
model of silicon acid shell around colloids was proved by high resolution
electron microscopy.

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The categories of this paper are: dg-ga
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
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The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol