Nanjing Tech University

About: Nanjing Tech University is a education organization based out in Nanjing, China. It is known for research contribution in the topics: Catalysis & Membrane. The organization has 21827 authors who have published 21794 publications receiving 364050 citations. The organization is also known as: Nangongda & Nánjīng Gōngyè Dàxúe.

In situ fabrication of halide perovskite nanocrystals embedded in polymer composites via microfluidic spinning microreactors

Abstract: All-inorganic halide perovskite nanocrystals (PNCs) have gained extensive attention for their high fluorescence properties and narrow full-width-at-half maximum (FWHM). However, the low fluorescence stability, poor processability, and production of lead-containing waste solutions restrict their practical application. Here, we report a facile, effluent-free approach to prepare CsPbBr3 PNCs/poly(methyl)methacrylate (PMMA) composites with good photoluminescence (PL) and PL stability at room temperature, which is applicable for scale-up fabrication of fluorescent perovskite nanocrystals in a green way. A microfluidic spinning technique was employed to build 1D–2D microreactors for continuous production of CsPbBr3/PMMA nanocomposites. The resultant PNC/PMMA fibers show widely tunable emission between 450 and 625 nm, a narrow FWHM of 18–42 nm, high color purity, and good processability. Then, the CsPbBr3/PMMA nanocomposites were used as color converters to fabricate a liquid crystal display (LCD) backlight with a 105% wide color gamut, as well as a white light-emitting diode (WLED) with a rendering index (CRI) up to 89.2. This strategy opens a promising green avenue to mass production of fluorescent perovskite nanocrystal composite materials useful for various optoelectronic applications.

Sulfonated organic heteropolyacid salts: Recyclable green solid catalysts for esterifications

Abstract: A family of solid organic heteropolyacid (HPA) salts were prepared by combining Keggin heteropolyanions with ionic liquid (IL)-forming cations functionalized by propane sulfonate (PS). Their catalytic activities were evaluated in esterifications, including the testing of the influence of organic cations, function of heteropolyanions, scope of reactions, optimization of reaction conditions, and catalytic reusability. The obtained catalysts caused a liquid–liquid biphasic esterification system, presenting high yield and selectivity for target esters, and after reaction, they appeared in solid state again, which could be easily recovered and quite steadily reused demonstrated by a seven-run recycling test. The highly efficient and environmentally benign performance of this family of catalysts is due to the pseudoliquid behavior of HPA salts that allows PS acidic species in the bulk of the heteropoly compound acting fully as active centers for esterification, as well as the stabilization function of heteropolyanion on carbonium ion intermediates created at acid sites.