Latest ArticlesMaterial stability is always the key factor for applied materials especially the working environment that requires higher temperature sensitivity or temperature fluctuation range. In which, the stimulus-response perovskite materials are just sensitive to stability to ensure the accuracy and stability of the signals, in the applied devices of batteries and memory storage devices and so on. However, it is still a tremendous challenge to improve the stability of perovskite materials, and maintain reliability in the devices. Here, a novel ABX2X'1 (X-site doping in an ABX3) compound [CEMP]-[CdBr2(SCN)] (1, CEMP = 1-(2-chloro-ethyl)-1-methyl-piperidine) with remarkable high-temperature reversible dielectric switching behavior was proposed. The strategy of [SCN]− doping in perovskite for improving the stability was successfully achieved. Meanwhile, the steric hindrance is increased while the energy barrier is also increased by replacing hydrogen with flexible groups, which leads to a high-temperature reversible phase transition. The new finding provides a new direction to enrich new applications and design ideas of perovskite materials. Especially the X-site strategy of doping or substitution in the ABX3, it will promote ingenious and perfect experimental results in material synthesis and performance improvement by chemistry disciplines.
The synthesis of cyclopolymers upon controlling the degree of macrocyclic polymerization, followed by the discovery of new properties has attracted increasing attention in supramolecular chemistry. Herein, a Schiff-base condensation method performed at room temperature was used to control the formation of [1 + 1] and [2 + 2] macrocycles. In pure MeOH, the isomer [1 + 1] macrocycles were synthesized and organic particles such as dendritic, rods, and solid microspheres were directly precipitated from the reaction solution. The [1 + 1] macrocycles can be efficiently converted into their corresponding [2 + 2] macrocycles accompanied by the tunable morphology of the organic particles when n-hexane was added to the MeOH solution. Further studies showed that these organic particles have potential application toward the selective removal of Cd2+ ions with different adsorption ability in MeOH solution.
Functional dicyclophanes with various substituents (e.g., NO2, Br, OCH3 and OH) were synthesized via one-pot SN2 reaction. Dicyclophanes can form nanospheres via the head-to-tail self-assembly between the cavities and the TPE units to exhibit aggregation-induced emission (AIE) in aqueous solution. These AIE-active nanospheres with cationic feature exhibited selective recognition with fluorescence response for anionic ATP via electrostatic interactions and hydrophobic effects in water.
Although transition metal phospho-sulfides deliver outstanding electrochemical performance, complex preparation methods hindered their further development. Herein, we report a facile one-step electrodeposition approach to deposit interconnected nanowalls-like nickel cobalt phospho-sulfide (Ni-Co-P-S) nanosheets onto the surface of carbon cloth. The thin Ni-Co-P-S nanosheets with multi-components and synergetic effects delivered rich active sites, further enhancing reversible capacitance. Therefore, the as-prepared Ni-Co-P-S electrode materials exhibit excellent electrochemical performance in a three-electrode system, showcasing a high specific capacitance of 2744 F/g at 4 A/g. The full supercapacitors based on Ni-Co-P-S as positive electrode and active carbon as negative electrode showcase a high specific capacitance of 110.9 F/g at 1 A/g, impressive energy density of 39.4 Wh/kg at a power density of 797.5 W/kg in terms of excellent cycling stability (91.87% retention after 10, 000 cycles). This simple electrode position strategy for synthesizing Ni-Co-P-S can be extended to prepare electrode materials for various sustainable electrochemical energy storage/conversion technologies.
Hydrogen isotope separation is a challenging task due to their similar properties. Herein, based on the chemical affinity quantum sieve (CAQS) effect, the D2/H2 separation performance of M2(m-dobdc) (M = Co, Ni, Mg, Mn; m-dobdc4− = 4,6-dioxido-1,3-benzenedicarboxylate), a series of honeycomb-shaped MOFs with high stability and abundant open metal sites, are studied by gases sorption and breakthrough experiments, in which two critical factors, gas uptake and adsorption enthalpy, are taken into consideration. Among these MOFs, Co2(m-dobdc) exhibits the longest D2 retention time of 180 min/g (H2/D2/Ne: 1/1/98) at 77 K because of its second-highest adsorption enthalpy (10.7 kJ/mol for H2 and 11.8 kJ/mol for D2) and the best sorption capacity (5.22 mmol/g for H2 and 5.49 mmol/g for D2) under low pressure of 1 kPa and 77 K), which make it a promising material for industrial hydrogen isotope separation. Moreover, the results indicate that H2 and D2 capacities under low pressure (about 1 kPa) dominate the final D2/H2 separation property of MOFs.
The existence of many anions in wastewater reduces the removal efficiency of phosphate by adsorbents under realistic conditions. Facing this challenge, the study reports on an insistent and stable composite adsorbent of molybdate complexes Fe-(MoOx) embedded in a macroporous anion exchange resin (D-201). [Fe(MoOx)]-D-201 shows 93.7% adsorption capacity (28.3 mg/g) for phosphate even when the molar concentration of coexisting ions is 5 times higher than phosphate. The capacity of adsorbent is maintained more than 84.2% after five regeneration cycles to remove phosphate in the wastewater containing coexisting ions. The ability of highly selective removal of phosphate is maintained during the regeneration cycles explained by the change of the binding of molybdate clusters with phosphate, which is due to the different structures of molybdate clusters depending on various pH. In general, this work puts forward a new idea for the development of phosphorus removal adsorbents for the treatment of wastewater containing coexisting ions.
It is still a challenge to eliminate efficiently fluoride ion from groundwater, especially to design and synthesis an adsorbent possessing high adsorption capacity, recyclability and wide pH application conditions. Herein we present millimeter-sized sulfate-type zirconium alginate hydrogel beads with 3D network structure (AHB@Zr-SO42−) that exhibited a maximum adsorption capacity of 101.3 mg/g with wide pH applicability (pH 3−9). This material have ~2.5 times higher adsorption capacity than that of pure zirconium alginate hydrogel beads (AHB@Zr) and it was ascribed to ion exchange between SO42− and F− on the surface of AHB@Zr-SO42−, which was verified via ion chromatography measurement coupled with X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectrometer (FTIR Spectrometer) analysis. Density functional theory (DFT) calculations indicated that the ion exchange process between SO42− and F− in AHB@Zr-SO42− was energetically favorable than OH− and F− in AHB@Zr. In addition, 310 bed volumes (BV) of effluent was realized via column adsorption of groundwater containing fluoride on AHB@Zr-SO42− and indicated that it is a promising candidate for mitigating the problem of fluoride-containing groundwater.
The development of multifunctional theranostic nano-agents is an important resolution for personalized treatment of cancer. In this work, we synthesized a new kind of gadolinium boride nanoparticles (GBN) by a microwave-assisted chemical etching method, and discovered their optical characteristics including fluorescence imaging and near-infrared (NIR) photothermal conversion capability. Bright greenishyellow fluorescence enabled for intracellular localization, while effective NIR-photothermal conversion supported photothermal therapy (PTT). In vitro and in vivo results indicated that GBN exhibited a superior antitumor performance and high biocompatibility. This study demonstrated a promising multifunctional theranostic nanoplatform for cancer treatment.
Recent studies have shown that CTP may act as a ligand to regulate the activity of its target proteins in many biological processes. However, proteome-wide identification of CTP-binding proteins remains challenging. Here, we employed a biotinylated CTP affinity probe coupled with stable isotope labeling by amino acids in cell culture (SILAC)-based quantitative proteomics approach to capture, identify and quantify CTP-binding proteins in human cells. By performing two types of competitive SILAC experiments with high vs. low concentrations of CTP probe (100 vs. 10 µmol/L) or with CTP probe in the presence of free CTP, we identified 90 potential CTP-binding proteins which are involved in a variety of biological processes, including protein folding, nucleotide binding and cell-cell adhesion. Together, we developed a chemical proteomic method for uncovering the CTP-binding proteins in human cells, which could be widely applicable for profiling CTP-binding proteins in other biological samples.
The rapid degradation of organic pollutants, process monitoring and online controlling to obtain advanced products and decreased by-products are great and challenging tasks in environmental treatments. Herein, an accelerated plasma degradation in milliseconds was achieved by combining electrospray-based acceleration and plasma-based degradation. Taking the degradation of chloroaniline as an example, 97% of the degradation can be achieved in milliseconds. The velocity distribution of droplets was determined to be 40–50 m/s after being degraded for 0.30 ms, which exhibited different degradation behaviors in different milliseconds. Simultaneously, by virtue of the real-time and on-line detection ability of ambient mass spectrometry, intermediates, by-products and advanced products were monitored. Therefore, degradation mechanisms for different degradation times were proposed, which would provide theoretical guidance on obtaining efficient and green degradation. The fabrication, examining and understanding of accelerated plasma degradation not only enlarged application of accelerated reactions, but also promoted green and efficient degradation for environmental treatments.
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