Publications by authors named "Aina Zhang"

In this study, a novel approach is introduced to address the challenges associated with structural instability and sluggish reaction kinetics of δ-MnO in aqueous zinc ion batteries. By leveraging zwitterionic betaine (Bet) for intercalation, a departure from traditional cation intercalation methods, Bet-intercalated MnO (MnO-Bet) is synthesized. The positively charged quaternary ammonium groups in Bet form strong electrostatic interactions with the negatively charged oxygen atoms in the δ-MnO layers, enhancing structural stability and preventing layer collapse.

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The simultaneous intercalation of protons and Zn ions in aqueous electrolytes presents a significant obstacle to the widespread adoption of aqueous zinc ion batteries (AZIBs) for large-scale use, a challenge that has yet to be overcome. To address this, we have developed a MnO/tetramethylammonium (TMA) superstructure with an enlarged interlayer spacing, designed specifically to control H/Zn co-intercalation in AZIBs. Within this superstructure, the pre-intercalated TMA ions work as spacers to stabilize the layered structure of MnO cathodes and expand the interlayer spacing substantially by 28 % to 0.

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A new type of novel chiral pyridoxamines 3a-g containing a side chain has been developed. The pyridoxamines displayed catalytic activity and promising enantioselectivity in biomimetic asymmetric transamination of α-keto acids, to give various α-amino acids in 47-90% yields with up to 87% ee's under very mild conditions. An interesting effect of the side chain on enantioselectivity was observed in the reaction.

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Dispersive liquid-liquid microextraction combined with capillary zone electrophoresis-UV detection was developed for analyzing triclosan (TCS) and bisphenol A (BPA) in water, beverage, and urine samples. The factors influencing microextraction efficiencies, such as the kind and volume of extraction and dispersive solvent, the extraction time, and the salt effect, were optimized. A background electrolyte composed of 8 mM sodium tetraborate at pH 9.

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In this study, the oxidative stress induced by deca-polybromodiphenyl ether (BDE-209) was investigated in livers of Carassius auratus. Six groups of fish were exposed to blank and 0, 0.004, 0.

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An effective multi-residue pretreatment technique, solid-phase extraction (SPE) combined with dispersive liquid-liquid microextraction (DLLME), was proposed for the trace analysis of 14 polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in milk samples using gas chromatography-mass spectrometry (GC-MS). Interesting analytes in milk samples were extracted with hexane after protein precipitation. The hexane extracts were loaded on an LC-Florisil column to isolate analytes from the milk matrix.

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