Journal of Physical Chemistry Letters
·
2024
·
IF 4.8
Qinlong Chen,Lina Gao,Tingyu Liu,Alessandro Marchetti,Juner Chen,Huilin Pan,Xueqian Kong
Na superionic conductor (NASICON)-type Na3(VO)2(PO4)2F (NVOPF) exhibits excellent cycling stability for high-voltage sodium ion batteries. Various strategies have been developed to form ion-exchanged NVOPF which can enhance the ionic and electronic conductivity. However, the underlying ion transport mechanism and complex structural transitions during battery operation remained uninvestigated. In this work, we prepared lithium-exchanged NVOPF (namely NLVOPF) which shows improved ionic conductivity and increased capacity at high discharging rates. Solid-state nuclear magnetic resonance (SSNMR) revealed the distinctive presence of two kinds of Li-exchanged sites in the NLVOPF, which are attributed to the occupied lithium ions at the Na1 and Na2 sites (namely Li1 and Li2, respectively). The Li1 site was metastably replaced in the first cycle, yet the Li2 site participated in ion insertion/extraction in the subsequent cycles. Our characterizations show that the dynamic doping of lithium in NLVOPF could contribute to the improved cycling stability and capacity retention.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wei Shen,Liang Qiao,Juan Ding,Yongming Sui
Tailoring tantalum disulfide (TaS 2 ) electrocatalysts with tunable stacking architecture and phase structure is of great importance for advancement of hydrogen evolution reaction (HER). In this work, stacking architecture- and phase- modulated tantalum disulfide nanosheets are reported through a facile liquid phase synthesis strategy. Accordion-like nanosheets , vertical nanosheets and ultrathin nanosheets are named according to their obvious stacking architecture, and 1 T-2 H mixed phase structures containing different degrees of 2 H phases are realized. High-resolution transmission electron microscopy shows that there are obvious lattice defects in the nanosheets. Tantalum disulfide nanosheets synergistically integrate multiple advantages of nanostructure engineering, phase engineering and defect engineering. In the HER process, the ultrathin tantalum disulfide nanosheet structure is conducive to the in-plane electron transfer , and its close contact with the electrode surface makes the charge transfer faster and has the best HER activity. The overpotential of the ultrathin nanosheet electrocatalyst at 10 mA cm −2 is 280 mV. After 10,000 CV cycles and over 40 h of i-t test, the catalyst still has high stability in acidic media. Theoretical calculations show that the addition of 2 H phase structure and rich defects improves the intrinsic activity and active sites, and jointly promotes the improvement of HER performance. Our work integrates a variety of optimal regulation methods into TaS 2 nanosheets, providing a new idea for the construction of advanced electrocatalysts for water electrolysis.
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高影响因子
POLYMER SCIENCE SERIES B
·
2014
·Vol. 56
·期 6
·883-894
·
IF 0.633
Huang Ziqun,Cang Hui,Huang Rong,Cai Zhaosheng,Zhang Huaihong
A robust redox-responsive block copolymer was proposed and prepared as drug vehicle based on disulfide linked poly(2-methacryloyloxyethyl phosphorylcholine) and poly(trimethylene carbonate) (PMPC-ss-PTMC). The size and morphology of the polymer nanoparticles were characterized by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The profile of drug release response to glutathione (GSH) was monitored in vitro. Upon 10 mM GSH, mimicking the intracellular microenvironments such as cytosol and the cell nucleus, the resulted drug carrier was destructed ascribe to abruption of the disulfide bonds, followed by accelerated drug release from the nanoparticles. MTT assay showed that the blank micelles did not reveal cytotoxicity to the human cervical cancer HeLa cells and mouse connective tissue fibroblast L929 cells even up to 500 μg/mL. On the other hand, the Doxorubicin-loaded (DOX-loaded) micelles that contained disulfide bonds exhibit a higher cytotoxicity against HeLa cells than that of no disulfide bonds, but there was no significant difference in cytotoxicity against the L929 cells. Confocal laser scanning microscopy and flow cytometry investigation showed that the DOX-loaded micelles can be swiftly internalized, and effectively transmitted the drugs into nuclei. These results suggested that the copolymer as a robust and effective redox-responsive nanocarrier to augment drug efficacy for cancer cells.
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高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2013
·
IF 2.203
Hairong Tang,Xuezhi Zhou,Yingqiang Guan,Liming Zhou,Xinming Wang,Huijuan Yan
The decontamination of surfaces exposed to chemical warfare agents is an interesting scientific topic. The desorption behavior of bis(2-chloroethyl) sulfide (sulfur mustard, HD) from the surface of the HD-contaminated hardened cement paste (HCP) was investigated under different weather conditions, which should provide scientific reference data for protection and decontamination projects involving HD-contaminated HCP in different conditions. The desorption of HD from the surface of HCP wafers was studied, and the effects of the purge air flow rate , water content, sorption temperature, and substrate age were investigated. HD desorption was detected from the surface of HD-contaminated HCP, but the desorption velocity was relatively slow. The desorption quantity remained within an order of magnitude throughout a time span of 36 h (25 °C at 200 mL/min of purge air), and the amount of HD that was desorbed from each square meter of HCP surface was approximately 1.1 g (25 °C at 200 mL/min of purge air), which was approximately 5.5 percent of the total HD that was initially applied. A higher flow rate of the purge air, increased water content, and longer substrate age of HCP all increased the HD desorption. In contrast, increased temperatures suppressed HD desorption.
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高影响因子
Advanced Sustainable Systems
·
2023
·Vol. 7
·期 5
·2200473
·
IF 7.1
Jing Tang,Qingdong Ruan,Hongmin Yu,Chao Huang
Electrocatalytic water splitting generated oxygen (O 2 ) and hydrogen (H 2 ) is a promising way to solve the energy crisis. Oxygen evolution reaction (OER) compared to hydrogen evolution reaction (HER) has slow kinetics hindering overall process. Recently, cobalt hydroxide (Co(OH) 2 ) with high activity and stability for OER has attracted more attention. During the OER process, the Co 2+ in Co(OH) 2 is further oxidized to Co 3+ and CoOOH species are true active sites. However, the low conductivity of Co(OH) 2 hinders its oxidization to CoOOH. In addition, spontaneous growth of Co(OH) 2 agglomerates easily during hydrothermal treatment, leading to decreased active sites. Herein, an efficient strategy is developed to construct highly dispersive Co(OH) 2 nanosheets vertically grown on V 2 O 5 nanoflowers (Co(OH) 2 /V 2 O 5 ) at room temperature. The V 5+ of V 2 O 5 can oxidize Co 2+ of Co(OH) 2 into Co 3+ , resulting in in situ formations of CoOOH species favorable to the OER process. In situ Raman also investigates that the OH - species are inserted more easily into the interlayer of Co(OH) 2 of (Co(OH) 2 /V 2 O 5 ) than that of pure Co(OH) 2 . Therefore, the hybrid Co(OH) 2 /V 2 O 5 exhibits low overpotentials of 320 and 370 mV at a current density of 10 and 50 mV cm -2 , respectively, and a small Tafel slope of 68 mV dec -1 .
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高影响因子
LUMINESCENCE
·
2014
·Vol. 30
·期 2
·198-206
·
IF 1.675
Yaping Wang,Guowen Zhang
Di-(2-ethylhexyl) phthalate (DEHP) is widely used as a plasticizer in industrial production, but may have a potential health risk. In this study, the binding characteristics of DEHP with human serum albumin (HSA) in aqueous solution at pH 7.4 were determined using UV/vis absorption, fluorescence, Fourier transform infrared (FTIR) spectroscopy and circular dichroism (CD), along with a molecular simulation technique. Analysis of the fluorescence titration data at different temperatures suggested that the fluorescence quenching mechanism of HSA by DEHP was static. The calculated thermodynamic parameters indicated that hydrophobic forces played a predominant role in formation of the DEHP–HSA complex, but hydrogen bonds could not be omitted. Site marker competitive experiments and denaturation studies showed that the binding of DEHP to HSA primarily took place in subdomain IIA of HSA, and molecular docking results further corroborated the binding sites. The synchronous fluorescence, UV/vis absorption, FTIR and CD spectra revealed that the addition of DEHP induced changes in the secondary structure of HSA. Protein surface hydrophobicity (PSH) tests indicated that DEHP binding to HSA caused an increase in the PSH. Moreover, the effects of some metal ions on the binding constant of DEHP − HSA interaction were also investigated. Copyright © 2014 John Wiley & Sons, Ltd.
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高影响因子
IONICS
·
2016
·Vol. 22
·期 11
·2087-2093
·
IF 2.119
Yang F.,Yu Z.,Meng B.,Zhu Y. J.,Yang Q. Q.,Lin Z. L.,Zhou H. M.,Liang X. L.
The Sr 1 − x
Na
x
SiO 3 − x /2 samples (SNS, x = 0.2, 0.3, 0.4, 0.45) were prepared by spark plasma sintering (SPS) at a lower sintering temperature of 850 °C for a shorter holding time of 5 min. All SNS samples by SPS are composed of single monoclinic SrSiO 3 phase, and the grain sizes are in the range of 1.9 ± 0.5 μm. The measurement results of the electrical properties show that the conductivities of SPS samples are one order of magnitude higher than those of the samples by traditional sintering method. The ion transference numbers of SNS samples by SPS are all higher than 0.99 in the temperature range of 500∼650 °C, which demonstrates that the SNS has met the requirements as solid oxide fuel cell electrolytes and the SPS process is a promising candidate for preparations of SNS electrolytes.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Xiangyang Song,Kexuan Han,Dechun Zhou,Pengfei Xu,Xiaomeng Xue,Peng Zhang
Tm 3+ doped Bi 2 O 3 -GeO 2 -Na 2 O glass samples were synthesized by conventional melt-quenching method. The Raman spectra measurements showed the maximum phonon energy of prepared glass is 794 cm −1 , which is considerably lower than silicate glasses . Based on the measured absorption spectra , Judd-Ofelt intensity parameters, spontaneous radiative transition probabilities and radiative lifetimes were calculated to elucidate the radiative properties of Tm 3+ in the presented glass. Intense near infrared emission around ~2 μm was obtained under the pump of 808 nm laser diode . A large stimulated emission cross section (5.51 × 10 −21 cm 2 at 1851 nm) of Tm 3+ : 3 F 4 → 3 H 6 was achieved in the prepared bismuth germanate glass doped with 1 mol% Tm 2 O 3 . Besides, the energy transfer processes among Tm 3+ were analyzed using the extended overlap integral method. These results indicate that the presented glass is a promising candidate for ~2 μm laser applications.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2018
·
IF 4.358
Zhaocheng Zhang,Dongyang He,Haiyang Liu,Miao Ren,Yanan Zhang,Jiao Qu,Nan Lu,Jiunian Guan,Xing Yuan
Black phosphorus (BP), a superior two-dimensional (2D) semiconductor, has attracted much attention due to its unique properties. The graphene (GR)-BP hybrid was synthesized through one pot chemical vapor transport (CVT) approach. The characterization results indicated that P atom was successfully incorporated into GR by the formation of P-C bond. Remarkably, the newly-synthesized GR-BP represented high photocatalytic activity towards 2-chlorophenol (2-CP) degradation, due to the high efficiency of charge separation and transformation caused by the direct band gap of BP and carrier mobility of GR. The removal efficiency for 2-CP reached up to 87.08% within visible light irradiation for 180 min ( λ > 420 nm). The degradation rate of GR-BP hybrid for 2-CP was approximately 7.29-fold than that of BP within 30 min. In addition, the little increasing of the peak for P-O bond in GR-BP hybrid was observed after being exposed in air for 15 days, meant that the stability of BP was significantly enhanced. It was caused by the decreasing of the oxidation sites in BP due to the formation of P-C bond in hybrid. In brief, our synthetic method for GR-BP not only provides a novel route for the improvement of the stability of BP, but also constitutes an insight into the promising practical application of BP in the photocatalysis field.
研究领域:
材料科学
·
纳米科技
·
光催化
·
半导体材料
·
环境化学
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高影响因子
Environmental Science & Technology Letters
·
2025
·
IF 8.8
Lingjun Zeng,Mengyan Huang,Chongli Shi,Chen Wang,Jin Zhang,Yi Peng,Yang Zheng,Susu Wang,Jiawei Hong,Yangzhizhe Gao,María Dolores Hernando,Amadeo R. Fernández-Alba,Damià Barceló,Hui Li
Tris(1,3-dichloro-2-propyl) phosphate (TDCPP), a widely used chlorinated flame retardant, is ubiquitous in dust, water, and biota. Parental exposure of Caenorhabditis elegans to environmentally relevant TDCPP (0.1–10 μg/L) reduced mean lifespan by 14.9–20.9% in parental nematodes and 8.07–28.2% in offspring. Multiomics analyses (transcriptomics and lipidomics) uncovered a previously unrecognized lipid-centered mechanism by which TDCPP impaired organismal health. Specifically, TDCPP suppressed the expression of daf-16 and downstream fatty acid desaturase (fat-5/6), leading to depletion of unsaturated lipid species, including triglycerides, diacylglycerols, lysophospholipids, and glycosphingolipids. This disruption was corroborated by phenocopy experiments showing that genetic deletion of fat-5/6 or dietary supplementation with saturated fatty acids (positive control) mimicked TDCPP-induced aging phenotypes. Moreover, TDCPP downregulated aak-2 and cpt-1, impairing mitochondrial β-oxidation and energy metabolism. These findings identified a novel daf-16–fat-6–AMPK–CPT-1 signaling axis, providing mechanistic insight into how the environmental pollutant TDCPP disrupts lipid homeostasis to promote aging and transgenerational toxicity.
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Hu Xu,Niannian Lv,Yongqin Liu
Psychrophilic cellobiose 2-epimerase (CE) is a promising biocatalyst for cold-process dairy manufacturing, yet its industrial application is hampered by the inherent trade-off between low-temperature activity and substrate affinity. To overcome this limitation, a semi-rational design strategy was implemented on a psychrophilic CE (psyCE). A GFP-based fluorescence assay was developed to normalize mutant expression, enabling precise identification of activity improvements. Structure analysis pinpointed six key residues for targeted mutagenesis, and a saturation mutagenesis library was constructed accordingly. Screening of the library yielded a robust double mutant (FR) with superior kinetics. The FR variant exhibited a record-breaking catalytic turnover (245.7 s −1 vs. 219.9 s −1 ) and an improved substrate affinity (208.9 mM vs. 261.9 mM), resulting in a 40% increase in overall catalytic efficiency. In a practical biocatalysis trial at 8 °C, FR achieved a 21% epilactose yield within 3 h, outperforming the wild type (20% within 4 h). Molecular dynamics simulations revealed the structural basis of this enhancement by showing the FR mutant evolves an enlarged binding pocket, while simultaneously establishing a strengthened hydrogen-bond network. This study not only provides a highly efficient cold-active biocatalyst but also establishes a screening platform for engineering psychrophilic enzymes.
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Jiling Zhao,Zhaonan Yan,Qing Zhao,Weiran Diao,Ruichao Zhang,Jingyi Feng,Pingxia Zhang,Juan Wen,Yong Qin
The pursuit of high-purity cobalt is driven by its irreplaceable role in advanced electronic devices, particularly as a promising interconnect material for next-generation integrated circuits. However, the coexistence of nickel, which shares highly similar physicochemical properties with cobalt, presents a critical bottleneck in achieving electronic-grade purity cobalt. Developing efficient and selective separation materials is therefore paramount. In this study, we designed and synthesized an environmentally friendly adsorbent-chitosan beads functionalized with bis(2-pyridylmethyl)amine (CBs-PY). The CBs-PY adsorbent exhibits exceptional selectivity for Ni(II) over Co(II) under strongly acidic conditions (pH 2), achieving a remarkable separation factor of 100.31, significantly outperforming conventional pyridine-based resins. X-ray absorption spectroscopy (XANES/EXAFS) revealed the formation of stable Ni–N2 coordination structure on CBs-PY, with adsorbed Ni(II) ions showing low surface oligomerization. Furthermore, the adsorbent demonstrats excellent acid stability, reusability, and consistent performance in high-salinity environments. This work provides a sustainable and efficient strategy for the separation of Ni(II) and Co(II) in acidic media, offering significant potential for applications.
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产品关联
DOI
PubMed
高影响因子
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