Rapid sonochemical synthesis of spherical silica nanoparticles derived from brown rice husk

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>The nanoparticles of silica (SiO<SUB>2</SUB>) were synthesized from brown rice husk <I>via</I> the sonochemical process, during which the sonication time was varied from 0 to 50 min so as to modulate the material properties of the nanoparticles. The synthesized SiO<SUB>2</SUB> nanoparticles were confirmed to have amorphous natures in their structural characteristics. The mean particle sizes of the nanoparticles were increased from 5 to 40 nm with increasing sonication time from 0 to 50 min, respectively. The SiO<SUB>2</SUB> nanoparticles synthesized with the sonication time of 50 min showed to possess the highest porosity among our samples. Accordingly, the sample exhibited a higher effective surface area of 271.22 m<SUP>2</SUP>g<SUP>−1</SUP>. In addition, the bandgap of the SiO<SUB>2</SUB> nanoparticles was decreased from 5.77 to 5.68 eV with increasing sonication time (<I>i.e.</I>, 0 → 50 min). The results suggest that the SiO<SUB>2</SUB> nanoparticles synthesized with an appropriate control of the sonication time (<I>e.g.</I>, 50 min) hold promise for future nano-ecosystem applications such as nano-biosensors and energy storage nano-devices.</P>