The sonochemical coprecipitation reaction with moderate ultrasound
irradiation in low vacuum environment was used to obtain aqueous colloidal
suspensions of iron oxide nanoparticles (IONPs). Synthesized magnetite
nanoparticles were conjugated directly by Folic Acid using electrohydraulic
discharges as a processing technique before modification of the surface of
the nanoparticles. Electrohydraulic discharges were applied in two
operational modes with high and low power pulsed direct currents between the
electrodes. The physical and chemical properties of the obtained samples
were studied using X-Ray Powder Diffraction (XRD), Fourier Transform
Infrared Spectroscopy (FTIR), Dynamic Light Scattering (DLS), and Small
Angle X-Ray Scattering (SAXS). The investigation has proved an inverse cubic
spinel structure of magnetite with Folic Acid attachment to the magnetite
surface (mean crystallite diameter in the samples D = 27~29 ? 2 nm by XRD
and SAXS). It was found that the processing with electrohydraulic discharges
increases the colloidal stability of the Folic acid-magnetite nanoparticle
dispersions.
Thin crystalline ErS films have been grown by flash evaporation in vacuum using a pre-synthesized bulk material on quartz and sapphire substrate. The bulk material was synthesized by direct synthesis in sealed quartz ampoules at a temperature of 800 K. During the film growth process, the vacuum in the deposition chamber was maintained at 6 10 Pa, evaporator temperature was 2750 K and the substrate temperature 900 K. Film thickness was about 0.4-0.6 µm. All prepared films had a stoichiometric composition and a NaCl crystal lattice with a lattice parameter a = 5.48 Å. After deposition of films and cooling to room temperature the dependence of electrical resistivity on time was investigated by the four-probe method at atmospheric pressure. It is shown that the relaxation process on films deposited on a quartz substrate proceeds much more slowly than on films prepared on a sapphire substrate. A possible mechanism for such a difference is given.
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