Abstract:
Silica nanoparticles is one of the most important materials utilized in many
applications and industries, it is mainly used in glass industry and in electronic
devices such as Nanotransistors and Nanosensors. In the present study,
preparation of silicon dioxide nanoparticles from natural sands was
conducted by Alkali fusion method, samples are taken from different areas
(Shandi, Dongla, western Bara, southern Bara), in Sudan, and characterize the
optical properties of these samples. The alkali media method was performed on
each sample, the sand was immersed in hydrochloric acid HCl using magnetic
stirrer-hotplate, then certain amount of sodium hydroxide NaOH was mixed with
crude silica sand very well and heated until the mixture became liquid and
stiffened again, then dissolved with water, and filtered, after that the sulfuric acid
was added to the resulting mixture to form . It turned out that the
extraction and synthesis of nanoparticles by means of alkali-fusion method
proved that it is successful method in forming silica nanoparticles; the obtained
was characterized by Fourier Transform Infrared spectrometry (FT-IR), and
through Ultraviolet-visible spectrometry (UV). FT-IR spectral data confirmed
the chemical functional groups which are present in every silica nanoparticles
and different functional groups were reported for each sample, UV spectra
proved that different impurities that exist in each silica sands of different
locations have influence on optical properties, the result was that the energy band
gap of increases as we go north and decreases as we go south in
geographical location.
