An ultrasonic method for the synthesis, control and optimization of CdS/TiO₂ core–shell nanocomposites

Abstract

In this study, an ultrasonic method was utilized in combination with microemulsion to synthesize CdS/TiO2 core–shell nanoparticles and control their particle size and ultimately optimize the influential parameters.

Sonochemical catalysis as a unique strategy for the fabrication of nano-/micro-structured inorganics

“…To extend the absorption of TiO 2 to the visible region, Fallah et al employed an ultrasonic method in combination with microemulsion to prepare core-shell CdS/TiO 2 nanoparticles (i.e., CdS core and TiO 2 shell) and control their particle size. [177] By optimizing the influential parameters such as temperature, synthesis retention time, TiO 2 /CdS ratio and ultrasound power, the nanocomposites with an average size of up to 10 nm were successfully synthesized, namely a nano-sized TiO 2 layer (about 1 nm) fully enclosed the CdS core (about 9 nm), as Figure S9 showed. [177] Owing to the participation of CdS in the core-shell composites, the absorption spectra of TiO 2 occurred with a red shift, suggesting the optical absorption spectrum of nanocrystals had extended to the visible region.…”

“…, CdS core and TiO 2 shell) and control their particle size. 177 By optimizing the influential parameters such as temperature, synthesis retention time, TiO 2 /CdS ratio and ultrasound power, nanocomposites with an average size of up to 10 nm were successfully synthesized, namely a nano-sized TiO 2 layer (about 1 nm) fully enclosed the CdS core (about 9 nm), as shown in Fig. S9.…”

“…S9. † 177 Owing to the participation of CdS in the core–shell composites, the absorption spectra of TiO 2 occurred with a red shift, suggesting the optical absorption spectrum of nanocrystals had extended to the visible region.…”

Controllable microemulsion method for the synthesis of Mg(OH) 2 /PS core–shell structures

“…Coating polymer on the magnesium hydroxide surface to form a stable core-shell structure is an effective way to achieve modification purpose. At present, there are many reports on inorganic-inorganic core-shell materials, such as the synthesis of Pt-SiO 2 , Fe 2 O 3 @TiO 2 , CdS/TiO 2 , Fe@SiO 2 [18][19][20][21], and microemulsion method plays a certain role in the construction of the core-shell material [18]. As to inorganic-polymer composite, Jassim prepared ZnO/polystyrene nanocomposite films via sol-gel process [22], Jang synthesized CdS/PMMA core/shell nanoparticles using dispersion-mediated interfacial polymerization [23], and Guo constructed MnO 2 @PPy nanorods via an in situ self-polymerization process [24].…”

The degradation of cellulose in ionic mixture solutions under the high pressure of carbon dioxide

“…The process of the formation of acoustic cavitation bubbles is as follows (in sequence and simultaneously): bubble formation, successive growth, collapse, and microjet formation. [21][22][23] The theoretical estimation of the bubble collapse temperature and pressure can reach 5300 C and 310 bar, respectively, and the H and OH radical fraction produced per collapse event is higher 24,25 (the value set for the sonication frequency was 20 kHz). The microjets intensively pierce and attack the cellulose surface, damaging the cellulose solids.…”