Ultrarapid Multimode Microwave Synthesis of Nano/Submicron β-SiC

Abstract

This paper presents the design, development and realization of a fast and novel process for the synthesis of 3C silicon carbide (β-SiC) nanorods and submicron powder. Using SiO2 (or Si) and activated carbon (AC), this process allows β-SiC to be synthesized with almost 100% purity in timeframes of seconds or minutes using multimode microwave rotary tube reactors under open-air conditions. The synthesis temperature used was 1460 ± 50 °C for Si + AC and 1660 ± 50 °C for SiO2 + AC. The shortest β-SiC synthesis time achieved was about 20 s for Si + AC and 100 s for SiO2 + AC. This novel synthesis method allows for scaled-up flow processes in the rapid industrial-scale production of β-SiC, having advantages of time/energy saving and carbon dioxide emission reduction over comparable modern processes.

Microwave-assisted synthesis followed by a reduction step: making persistent phosphors with a large storage capacity

“…S2, supplementary information). The presence of microrods in the microwave-assisted solid-state process without using structural templates was already reported for different materials, e.g., β-SiC 45 , and β-NaYF4. 46 It is attributed mainly to the particle growing mechanism that starts with the formation of nanocrystals leading to the micrometric structure in a swift process.…”

Investigation on Characteristics of Microwave Treatment of Organic Matter in Municipal Dewatered Sludge

“…Thus, the choice of extractants plays a significant role in determining the efficiency of the microwave treatment. As reported, dimethyl carbonate represents a new generation of nontoxic solvent, exhibiting the characteristics of safety, convenience, less pollution, and diverse dissolution to organic compounds [14,15]. Thus, in this work, we investigated the effect of dimethyl carbonate as an extraction agent on the reduction rate of the organic matters under microwave irradiation.…”

“…low temperature of 93.4 °C, and the organic matters with high molecular weight were tightly attached to the sludge, so a higher energy is required to improve the extraction efficiency. As is well known, nanomaterials have a large specific surface area and many defects, thus, they exhibit high surface adsorption and microwave absorption [15][16][17][18][19], which leads to the increase in temperature around the nanomaterials.…”

“…Furthermore, microwaves can penetrate inside materials, providing heat from inside to outside, which is advantageous to the volatilization of the water and organic matters. As a result, the thermal effect and nonthermal effect of the microwave treatment together lead to a fast organic matters extraction and sludge dewatering [14,15].…”

Dual-targeting peptides@PMO, a mimetic to the pro-apoptotic protein Smac/DIABLO for selective activation of apoptosis in cancer cells

“…FT-IR analysis showed the presence of characteristic peaks and further confirmed the occurrence of functionalization of the peptides on the nanoparticles. In SS4 , the presence of stretching vibration at 3384 cm -1 shows the presence of Si-OH, and the broad peak at 1088 cm -1 corresponds to the SiO stretching vibrations ( Zhao et al, 2018 ). The peak around at 693 cm -1 indicates stretching vibrations and has been assigned to Si-C; the C-H deformation vibrations at 2896 cm -1 , 1412 cm -1 , and 1271 cm -1 are due to the presence of the silsesquioxane structure ( Dìaz-Morales et al, 2006 ).…”