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90
RADIOCHEMISTRY, STABLE ISOTOPES,
NUCLEAR ANALYTICAL METHODS, GENERAL CHEMISTRY
Congress. Part A. Ed. P. Vincenzini. Techna Srl,
Faenza 2003, pp.341-352.
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STUDY OF GLUCOFURANOSE-BASED GEL NANOSTRUCTURE
USING THE SAXS METHOD
Helena Grigoriew, Roman Luboradzki 1/ , Dagmara K. Chmielewska, Monika Mirkowska 2/
1/
Institute of Physical Chemistry, Polish Academy of Sciences, Warszawa, Poland
2/
Warsaw University of Technology, Poland
The glucofuranose-based gels were synthesized by
the method described in [1]. The gelator of chemical
formula: 1,2-O-(1-ethylpropylidene)-α-D-glucofuranose
is built of furanose ring and contains three
unprotected -OH groups. Its concentrations of 3,
1, 0.5 and 0.1% in toluene were chosen. The measurements
were carried out with a ULTRA-SAXS
BW-4 wiggler beamline of the HASYLAB synchrotron.
The obtained data were subjected to pie integration
and, after normalization, to subtraction
of the background which was the SAXS curve of
the solvent. For each sample, two measurements
with sample-detector distances of 4 and 12 m were
performed and joined using OTOKO program [2]
Table. Structural parameters vs. gelator concentration.
to get a bigger range of the data. The complex method
of SAXS data processing was applied, to find
structural parameters of the gelator in gel, such as:
the mass fractal, d m , and surface fractal, d s , dimensions,
radius of gyration, R g , distance distribution
function, p(r), and dummy atom models [3-5].
The results (Table and Figs.1 and 2) of all methods
make it possible to assume that two types of
aggregates exist in the gel. The differences between
them are: the first type (for 3% gel) – the aggregate
is smaller, compact, of well-defined smooth surface
and a rod-like shape, and the second type (for 0.1%
gel) – aggregate is bigger, looser, of rough surface
and a disk-like shape. The aggregate change at in-