Pure-Phase Perovskite Quantum Well for Green Light-Emitting Diodes.

Perovskite multiple quantum wells (MQWs) have shown great potential in the field of light-emitting diodes (LEDs). However, the random formation of QWs with varying well widths ( numbers) often leads to suboptimal interface defects and charge transport issues. Here, we reveal that the crystallization sequence of bromide-based perovskite MQWs is large- QWs preceding small- QWs.

Imaging metabolic mechanisms and the binding behavior of nutrients/transporters of edible Matricaria flowers VOCs.

To promote the consumption of flowers and to utilize the nutritional value of proteins, the efficacy of the beneficial components of flowers has been intensively studied. Anthemis nobilis was used as the study object, and all its volatile components (VOCs) were fingerprinted using headspace solid-phase micro-extraction gas-mass spectrometry (HS-SPME/GC-MS). GC-MS fingerprints of five parts of Anthemis nobilis were established using three proteins, bovine lactoferrin (BLF), bovine lactoglobulin (β-Lg), and human serum albumin (HSA), as nutrient transporters.

Controlled synthesis of polycarbonate diols and their polylactide block copolymers using amino-bis(phenolate) chromium hydroxide complexes.

A diamine-bis(phenolate) chromium(III) complex, CrOH[L] ([L] = dimethylaminoethylamino-,-bis(2-methylene-4,6--butylphenolate)), 2, in the presence of tetrabutylammonium hydroxide effectively copolymerizes CO and cyclohexene oxide (CHO) into a polycarbonate diol. The resultant low molar mass (6.3 kg mol) diol is used to initiate ring-opening polymerization of -lactide with 1,8-diazabicyclo[5.

Development of Carbon Nanotube/Graphene-Based Alginate Interpenetrating Hydrogels for Removal of Antibiotic Pollutants.

The extensive use of pharmaceutical antibiotics in treatment of human and animal infections has resulted in growing concerns about antibiotic pollution worldwide. In this work a novel interpenetrating polymer network (IPN) hydrogel has been developed to function as an effective and non-selective adsorbent for various antibiotic pollutants in aqueous solution. This IPN hydrogel is made of multiple active components, including carbon nanotube (CNTs), graphene oxide (GO), and urea-modified sodium alginate (SA).

Highly catalytic supramolecular host-guest complex for high value directional conversion of lignin to syringyl monomer.

In order to meet the challenge of enzyme catalysis of waste lignin, laccase (LAC)- guaiacyl(G)-type monomers noncovalent supramolecular system (LGS) were constructed for conversion of lignin. In this contribution, the catalytic effect of LGS formed by LAC and G-type monomers was studied. LAC changes the secondary structure conformation of its binding site to accommodate the G-type monomer, which is bound by hydrogen bonding and hydrophobic interactions.

Effects of polystyrene microplastics on the seed germination of herbaceous ornamental plants.

Although microplastic (MP) pollution has become an environmental issue worldwide, most related research has been confined to marine ecosystems. The impacts of MPs on terrestrial ecosystems, and especially on terrestrial plants, are poorly studied. In our study, different particle sizes (2 μm and 80 nm) and different concentrations (0, 10, 50, 100, and 500 mg·L) of polystyrene MPs were selected as the experimental materials, and their effects on three herbaceous ornamental plants, Trifolium repens, Orychophragmus violaceus, and Impatiens balsamina, were investigated.

Electrocatalytic Properties of a Novel β-PbO/Halloysite Nanotube Composite Electrode.

To improve the efficiency of electrochemical degradation of wastewater, lead dioxide was synthesized by a hydrothermal method with low cost, simple operation, and high conversion rate. β-PbO/HNT composites were prepared by a hydrothermal method with Halloysite nanotubes (HNTs) and β-PbO. The PbO/HNT/ITO electrode was prepared by modifying the β-PbO/HNT composite on an indium tin oxide (ITO) conductive glass electrode.

Kinetic Studies of Copolymerization of Cyclohexene Oxide with CO by a Diamino-bis(phenolate) Chromium(III) Complex.

A diamino-bis(phenolate) chromium(III) complex, CrCl(THF)[L], 1, where [L] = dimethylaminoethylamino- N, N-bis(2-methylene-4,6- tert-butylphenolate), has been synthesized in high yield and characterized by MALDI-TOF mass spectrometry, elemental analysis, UV-vis spectroscopy and single crystal X-ray diffraction. This complex combined with 4-dimethylaminopyridine (DMAP) or bis(triphenylphosphoranylidene)ammonium chloride or azide salts (PPNCl or PPNN) shows improved activity over previously reported amine-bis(phenolate) chromium(III) complexes for copolymerization of cyclohexene oxide (CHO) and CO to yield poly(cyclohexene) carbonate (PCHC). Kinetic studies of the complex/DMAP system showed the activation energy for polycarbonate formation to be 62 kJ/mol.

A MALDI-TOF MS analysis study of the binding of 4-(N,N-dimethylamino)pyridine to amine-bis(phenolate) chromium(III) chloride complexes: mechanistic insight into differences in catalytic activity for CO2/epoxide copolymerization.

Amine-bis(phenolato)chromium(III) chloride complexes, [LCrCl], are capable of catalyzing the copolymerization of cyclohexene oxide with carbon dioxide to give poly(cyclohexane) carbonate. When combined with 4-(N,N-dimethylamino)pyridine (DMAP) these catalyst systems yield low molecular weight polymers with moderately narrow polydispersities. The coordination chemistry of DMAP with five amine-bis(phenolato)chromium(III) chloride complexes was studied by matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS).

A new phenanthroline-oxazine ligand: synthesis, coordination chemistry and atypical DNA binding interaction.

1,10-Phenanthroline-5,6-dione and l-tyrosine methyl ester react to form phenanthroline-oxazine (PDT) from which [Cu(PDT)(2)](ClO(4))(2) and [Ag(PDT)(2)]ClO(4)·2MeOH are obtained. Binding to calf-thymus DNA by Ag(I) and Cu(II) PDT complexes exceed bis-1,10-phenanthroline analogues and the minor groove binding drugs, pentamidine and netropsin. Furthermore, unlike the artificial metallonuclease, [Cu(phen)(2)](2+), the [Cu(PDT)(2)](2+) complex does not cleave DNA in the presence of added reductant indicating unique interaction with DNA.