The extractive desulfurization of thiophene (TS), dibenzothiophene (DBT), and benzothiophene (BT) in model oil was carried out using carboxylic acid-based deep eutectic solvents (DES). It was found that DES formed by formic acid as hydrogen bond donor and Tetrabutylammonium bromide (TBAB) as hydrogen bond acceptor could efficiently separate organosulfur from oils. The influence parameters in this process were discussed, such as extraction temperature, reaction time, mass ratio of DES to oil; multistage extraction effect; recycle times and regeneration of DES. The results showed that the desulfurization selectivity of TBAB/HCOOH followed the order TS < BT ≈DBT. Under the Optimized conditions, the sulfur removal of BT, DBT and TS were 81.75%, 80.47% and 72% in a single stage, respectively, and after three cycles, it will rise to 98.32%, 98.24% and 97.6%. The sulfur content in fuels can be achieved to less than 8.4, 8.8 and 12 ppm for BT, DBT and TS. In addition, by mechanism discussion, it was proved that hydrogen bonding between the sulfide and DES was the main driving force of the extraction desulfurization process.
Selective laser sintering (SLS) is an additive manufacturing technology which has shown great advantages in direct formation of the polymer, metal and their composites. However, ceramic parts prepared by the SLS still exhibit some fatal defects, including low density and poor mechanical properties. In this respect, recent advances for preparing ceramics have improved the final density and performance by adopting post-processing methods. In this review, three commonly used powder preparation approaches (i.e. mechanical mixing, solvent evaporation and dissolution-precipitation process) and two powder sintering mechanisms for the SLS are introduced. Porous ceramic parts are prepared directly through the SLS by virtue of their high porosity. And dense, high-performance Al 2 O 3 , ZrO 2 , kaolin and SiC ceramic parts with complex shape are prepared by introducing CIP technology into the SLS, indicating that the hybrid technology could be the promising route for preparing highperformance ceramic parts used in various fields.
Hybrid
perovskites are emerging as a promising, high-performance
luminescent material; however, the technological challenges associated
with generating high-resolution, free-form perovskite structures remain
unresolved, limiting innovation in optoelectronic devices. Here, we
report nanoscale three-dimensional (3D) printing of colored perovskite
pixels with programmed dimensions, placements, and emission characteristics.
Notably, a meniscus comprising femtoliters of ink is used to guide
a highly confined, out-of-plane crystallization process, which generates
3D red, green, and blue (RGB) perovskite nanopixels with ultrahigh
integration density. We show that the 3D form of these nanopixels
enhances their emission brightness without sacrificing their lateral
resolution, thereby enabling the fabrication of high-resolution displays
with improved brightness. Furthermore, 3D pixels can store and encode
additional information into their vertical heights, providing multilevel
security against counterfeiting. The proof-of-concept experiments
demonstrate the potential of 3D printing to become a platform for
the manufacture of smart, high-performance photonic devices without
design restrictions.
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