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| Silica with nano particles of silver is brown colour powder of bulk density 0.4 - 0.6 g/ml (Fig. 1). Brown colour is characteristic for silver in nano scale.
Fig. 1. Silica with silver nano particles
Analysis made by means of transmission electron microscopy (TEM) (Fig. 2, Fig. 3), allowed determining uniquely the size of grains of silica (SiO2) and silver (Ag). Silica grains diameter is 500 nm, however silver particles diameter included within the scope from 5 nm and 20 nm.
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| Photograph of SiO2-Ag, TEM technique, enlargement x 100,000 |
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Fig. 2. Photograph of SiO2-Ag, TEM technique, enlargement x 200,000 |
X-ray diffraction technique (XRD) allowed obtaining the spectrum (Fig. 4) of new product. Researches confirmed that silica exists in safe – amorphous form; whereas silver occurs in metallic form, proved by Ag peaks in spectrum.
Fig. 4 Spectrum obtained using XRD techniques, demonstrating crystalline form of silver (Ag) and lack of crystalline form of silica (SiO2)
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