Chinese Journal of Natural Medicines
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2012
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IF 0
Yi LI,Ming RUAN,Jian-Guang LUO,Ling-Yi KONG
A novel on-line method using high performance liquid chromatography (HPLC) with a diode array detector (DAD) and a chemiluminescence (CL) detector was successfully developed for simultaneously analyzing the antioxidant efficacies of 15 components in Guan-Xin-Ning (GXN) injection, a traditional Chinese medicinal preparation consisting of Radix Salvia miltiorrhiza and Rhizoma Ligusticum chuanxiong for the treatment of coronary heart disease and angina pectoris. The analytical conditions were optimized, validated and applied to determine H 2 O 2 inhibition rates of the 15 phenolic acids in GXN injections from 14 different production batches. The results showed that antioxidant diversities were found in the 15 compounds and that danshensu, protocatechuic aldehyde and rosmarinic acid were largely responsible for the antioxidant activity of GXN injection (25.82%-51.19%). In addition, 14 batches of GXN injections were divided into five groups corresponding with five different factories by principal component analysis (PCA) assay. Therefore, the proposed HPLC-DAD-CL method was simple, rapid and low-cost for screening antioxidant constituents in a complex system, which can be used to reveal the antioxidant mechanism of GXN injection and is applicable for its quality control in terms of activity, which was different from the routine chemical assessment.
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Energy Technology
·
2016
·Vol. 4
·期 9
·1112-1118
·
IF 2.557
Handong Jiao,Junxiang Wang,Jiguo Tu,Haiping Lei,Shuqiang Jiao
An aluminum-ion asymmetric supercapacitor was assembled utilizing a cathode made of multi-walled carbon nanotubes (MWCNTs) in an ionic liquid 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)-based electrolyte. Two types of energy-storage mechanisms, that is, electrochemical double-layer capacitance (adsorption/desorption of AlCl 4 − on the surface) and limited intercalation pseudocapacitance (intercalation/deintercalation of AlCl 4 − in the graphite layer) at low current density, were observed and characterized. Meanwhile, the specific capacitance and cyclic stability of this supercapacitor were also evaluated by using galvanostatically charging–discharging. The result demonstrates that the specific capacitance decreases with increasing current density, which corresponds to the two types of energy-storage mechanisms of this device. The corresponding retention rate of this device after 3500 cycles at current density of 0.4 A g −1 was 82.4 %, which shows good cyclic stability.
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高影响因子
Chemistry-An Asian Journal
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2024
·Vol. 19
·期 24
·e202400798
·
IF 3.5
Haiyun Zhou,Pingping Li,Tingting Zhong,Yunzhen Teng,Siqi Li,Xiaofeng Luo,Xinning Wang,Min Yang,Guowei Deng
Mn doping has been used to improve the physical chemistry of lead halide perovskite nanocrystals such as CsPbX 3 , where X is a halogen ion. In this paper, a two-phase method for Mn-doped CsPbX 3 nanosheets (where X=Br, Cl), namely water-hexane system, is reported. Compared to conventional catalyst arrays, the band gap of CsPbBr 3 nanocrystalline is easily tuned, the carrier diffusion distance is remote, the band edge position of the band structure is favorable for a wide range of electrocatalytic redox reactions, and the catalytic active site is maximally exposed, providing a larger electrolyte contact area. The porous hierarchical structure also accelerates the release of hydrogen bubbles. The results showed that the optimized Mn : CsPbBr 3 catalyst exhibited excellent electrolytic performance of aquatic hydrogen in alkaline electrolyte (1 mol/L KOH). The overpotentials of the oxygen evolution reaction (OER) at the current densities of 10 and 100 mA cm −2 are only 114.4 and 505.4 mV, respectively, with a Tafel slope of 43 mV dec −1 . At a current density of 10 mA cm −2 , the excess potential required for the hydrogen evolution reaction (HER) is 158.6 mV and it exhibits excellent electrochemical stability. The Mn : CsPbBr 3 nanocrystalline consists of two electrodes for hydrolysis of water, requiring only a voltage of 1.45 V. This provides implications for the optimization of electrocatalysts in alkaline electrolytes with the aim of developing next generation 2D electrocatalysts for overall water splitting.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Lufang He,Zhuo Liu,Yuchi Zhang,Le Han,Yan Xu
Nitrite is commonly found in the natural environment and in everyday human activities. However, excessive nitrite consumption can potentially harm human health. Consequently, it is crucial to develop a reliable and sensitive method for nitrite detection. In this work, trichloroacetic acid functionalized Cl-Fe-MIL-88B metal-organic framework is obtained through nucleophilic reaction between animated Fe-MIL-88B and trichloroacetic acid, which is then annealed with melamine in an N 2 atmosphere to produce the Fe/Cl/N triply-doped bamboo-like carbon nanotubes (CNTs) wrapped with Fe 3 C nanoparticles. Owing to the effective doping of Fe/Cl/N elements, the charge distribution and chemical activity of the bamboo-like structure are tailored, greatly improving the conductivity and facilitating electron transfer of the composite for potential electrocatalytic reaction. The Fe 3 C nanoparticles wrapped inside the CNTs contribute to expose more active sites and provide effective surface area. Accordingly, the Fe/Cl/N doped bamboo-like structure modified glassy carbon electrode shows excellent electrochemical nitrite sensing properties with a high sensitivity of 1060 µA cm −2 mM −1 , a low detection limit of 0.61 µM in a wide linear concentration range of 5–5000 μM, as well as good anti-interference and long-term stability. Also, the electrochemical sensor has a satisfactory recovery rate for detecting nitrite ions in spiked milk samples. This work proposes a simple precursor chlorination and pyrolysis strategy to obtain metal-filled bamboo-like structure with high electrical conductivity and electrocatalytic properties, endowing great potential in food safety and environment monitoring.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2017
·Vol. 24
·期 8
·1898-1904
·
IF 5.317
Shaofan Fang,Guangshe Li,Yantong Lu,Liping Li
Graphical Lifting the curse : We reported on a novel route by using solid metal halides as halide sources that achieve an anion exchange with CsPbX 3 without any pretreatment. Introducing small amounts of oleic acid or oleylamine speed up the exchange reaction rate, although showing different promotion mechanisms (see figure). Cesium lead halide perovskite (CsPbX 3 ) nanocrystals (NCs) exhibit an excellent photoelectric performance, which is directly governed by fine-tuning of the composition and preparation of materials with a special phase structure and morphology. However, it is still facing challenges to achieve highly stable and luminescent CsPbX 3 NCs at room temperature. Herein, we report on a novel exchange reaction, in which metal halides MX 2 (M=Zn, Mg, Cu, or Ca; X=Cl, Br, or I) solids act as anion source to directly prepare CsPbX 3 NCs at room temperature without any pretreatment. Introducing small amount of oleic acid or oleylamine speed up the exchange reaction through different promotion mechanisms. Oleic acid coordinates to the surface of the NCs, which increases the reaction activity, and oleylamine greatly enhances the dissolution of ZnCl 2 . XRD and TEM tests demonstrate that the cubic phase structure and the morphology of the parent CsPbX 3 were well preserved. Moreover, the band-gap energies and photoluminescence (PL) spectra were readily tunable over the entire visible spectral region of λ =406–685 nm. Our findings could open up the possibilities of using metal halide solids as new anion sources to prepare high-quality CsPbX 3 NCs at room temperature.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·Vol. 31
·期 29
·42075-42087
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IF 0
Zhang Qian,Lan Xin-yue,Huang Zhi,Liu Yan-ying,Hong Jun-ming
Highly active catalysts with salt and acid/alkali resistance are desired in peroxymonosulfate (PMS) activation processes and marine environment applications. F- and Cl-doped graphene (F-GN and Cl-GN) were prepared via electronegative and atom radius adjustment for tetracycline hydrochloride (TCH) pollution removal to satisfy these requirements. The introduction of special F and Cl functionalities into graphene exhibits superior electron transfer properties for PMS activation, considering the experimental and density functional theory (DFT) calculation results. The TCH degradation efficiency reached up to 80% under various pH and salt disturbance conditions with F-GN and Cl-GN. Cl-GN exhibited an activity superior to F-GN due to the higher electron polarization effect of C atoms adjacent to Cl atoms. The presence of more positive charged C sites in Cl-GN (around Cl doping) is more favorable for PMS attachment and sequence radical generation than F-GN. In addition, the main active species functionalized during reaction included ·OH and SO 4 − ·, and the stability of F-GN and Cl-GN was confirmed to be over 60% by recycle test. Final research results provide an effective strategy for designing and preparing PMS activators resistant to salt, acid, and alkali, thereby expanding their application potential.
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PubMed
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Hui Wang,Hongtu Zhao,Wenbo Wu,Shifan Xu,Na Wang,Ting Wang,Xin Huang,Lina Zhou,Ying Bao,Hongxun Hao
The solubility performance of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane has been investigated by the combination of experimental measurement, solvent parameter analysis, and molecular simulation methods. The solubility in 10 pure solvents at 293.15 K to 343.15 K was determined. It was found that the solubility in nine solvents increased with temperature, except for isoamyl propionate. However, it has the largest solubility in isoamyl propionate (4.36 × 10 −2 ∼ 5.39 × 10 −2 ). Additionally, a correlation analysis was performed using four equations, which showed that the NRTL equation provided the best fit (overall average relative deviation = 3.74 %, overall coefficient of determination = 0.991). Moreover, the solvent effect was analyzed by Hansen solubility parameters, predicting good solubility in solvents with R a(V) ≤ 12.47 MPa 0.5 or Δ δ t ≤ 7.77 MPa 0.5 , indicating weak polarity of solvent and weak solvent–solvent intermolecular hydrogen bonds enhance dissolution. Furthermore, molecular electrostatic potential surface and radial distribution function analyses provided that weak hydrogen bonding C-H···O promotes dissolution.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Chenyang Liu,Shuxiang Jiao,Yuhua Liu,Tao Wu,Leilei Xie,Lijuan Zhang,Yun Zhang,Wenming Wang,Hongfei Wang
Three isomeric nitrosylruthenium complexes [RuCl(Qn)(Pro)(NO)] ( 1 – 3) were prepared, where Qn is 8-hydroxyquinoline and Pro is D-proline. The complexes 1 – 3 were characterized by 1 H-NMR, 13 C-NMR, ESI-MS, and their crystal structure were further determined with X-ray diffraction techniques. In complexes 1 and 3 , the O atom of D-proline coordinated trans to NO, while the O atom of 8-quinolinol coordinated trans to NO in complexes 2 , and the complexes 1 and 3 are the Ru-centered enantiomers. The photo induced NO release of the complexes were explored using time-resolved infrared spectroscopy (FT-IR) and electron paramagnetic resonance spectroscopy (EPR) in solution and the released NO was successfully imaged in living cells using a NO selective fluorescent probe. Furthermore, the cytotoxicity of the isomeric complexes against HeLa, HepG2 and A549 cells were evaluated. Among them, the selectivity for HeLa cells is significant (SI ≥ 5) with IC 50 values in the range of 1.15–1.94 μM. Moreover, the three complexes spontaneously bind to human serum albumin (HSA) through hydrogen bonding and van der Waals forces, the binding constants K b of 1 – 3 are 1.528 × 10 4 , 2.390 × 10 4 and 2.694 × 10 4 M −1 at 298 K, respectively. Molecular docking analyses reveals that 1 – 3 bind within subdomain IB of the protein, which suggest that HSA could be a delivery vehicel for these complexes. This study provides insight into the potential biological and pharmaceutical applications for these isomeric nitrosylruthenium complexes.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2025
·
IF 3.1
Ma SongYuChen,Li YinHui,Di Yang,Liu Tao,Wang DeQi,Shi WenJing,Ling ZhiGang,Li FengSheng,Liu Jie
To enhance the safety performance and thermal stability of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexazepane (CL-20), a core–shell composite was synthesized via in situ polymerization of aniline on polyethyleneimine (PEI)-modified CL-20. PEI modification introduced –NH 2 groups onto CL-20 surface, providing active sites for aniline polymerization and inhibiting its self-polymerization, thus forming dense polyaniline (PANI) shells with uniform thickness (about 2.8 mass%) while maintaining the high-energy crystal structure of CL-20. Compared to pure CL-20, CL-20-P@PANI showed a 15.8 °C increase in phase transition temperature (185.5 °C) and a 4 °C rise in thermal decomposition temperature (247.21 °C), attributed to the thermal barrier effect of PANI shells. The results of the mechanical sensitivity test indicate that the dense polyaniline shell layer effectively dissipates external forces, leading to a 51.43% reduction in impact sensitivity and a 20% decrease in friction sensitivity. This study provides a novel modification approach for high-energy materials by combining PEI-mediated interface engineering with in situ polymerization, ensuring both safety and energy characteristics. Graphic abstract
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高影响因子
Defence Technology
·
2025
·
IF 5.9
Hao Wang,Chenming Li,Enjie Zhang,Yapeng Ou,Xiaoxia Ma
Hexanitrohexaazaisowurtzitane (CL-20) is a high-energy explosive widely used in composite explosives and propellants, but its application is severely limited by thermally induced ε-to-γ polymorphic transition and high solubility in nitrate ester solvents. The transition reduces energy density and increasing sensitivity, and the solubility causes dissolution-recrystallization defects (e.g., voids, compositional inhomogeneities) during long-term storage. To address these issues while preserving its high energetic performance, this study developed a polydopamine@polyvinylidene fluoride (PDA@PVDF) dual-coating strategy, fabricating CL-20 composite particles with a core-shell structure. In-situ X-ray diffraction (XRD) results confirmed that the ε-to-γ phase transition temperature of CL-20 increased from 110 °C (pristine CL-20) to 140 °C. Meanwhile, the CL-20@PDA@9%PVDF sample exhibited the lowest solubility and the best solvent resistance, and the solubility of CL-20 in nitrate ester solvents was drastically reduced from 0.229 g/100 g to 0.026 g/100 g, an 88.6% decrease, effectively enhancing its structural and solvent resistance stability. For energetic performance, when mixed with aluminum powder at a 7:3 mass ratio, the CL-20@PDA@9%PVDF/Al composite achieved a combustion heat of 8275 J/g, 8.7% higher than that of the unmodified Al/CL-20 system (7611 J/g). Combustion pressure tests showed that although the modified system exhibited slightly lower initial peak pressure and pressure rise rate due to dilute CL-20 content from inert coatings, it presented a unique "delayed enhancement" effect, with pressure gradually surpassing and ultimately exceeding that of the unmodified system in the middle and late combustion stages, enabling more sustained high-pressure output. This work realizes the synergistic optimization of CL-20’s polymorphic/solvent stability and energetic performance, providing a feasible and scalable approach for the practical application of CL-20 in advanced energetic systems.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Muhammad Amin Padhiar,Minqiang Wang,Yongqiang Ji,Zhi Yang,Yun Zhou,Hengwei Qiu,Hao Wang,Azaz Ali Shah,Arshad Saleem Bhatti
Perovskite nanocrystals (PNCs) are ideal for optical devices due to their adjustable emission band and high photoluminescence. However, blue light-emitting perovskite nanocrystals (PNCs) exhibit poor performance compared to their green and red-emitting PNC counterparts. Herein, we introduce a simple strategy for increasing the stability of blue light-emitting CsPb (Br/Cl)3 PNCs passivated with an Al-doped CdSe layer. This simple strategy successfully achieves highly stable PNCs with photoluminescence (PL) emission ranging from 454 to 460 nm with a full width at half-maximum (FWHM) ranging from 18 to 22 nm; changes in bandgaps are also observed, and the corresponding PLQY values show a significant change after CdSe/Al modification. In addition, CsPb (Br/Cl)3 PNCs with a CdSe layer doped with Al formed on the surface show remarkable stability under ambient conditions, including thermal exposure, water resistance, and ultraviolet (UV) irradiation. A light-emitting diode (LED) device was constructed to demonstrate the feasibility of the approach by combining the optimal CsPb(Br/Cl)3/CdSe/Al PNCs with an existing commercial 365 nm UV chip, resulting in bright blue light emission with CIE color coordinates of (0.16, 0.09). All of the findings suggest that doped CsPb (Br/Cl)3/CdSe/Al PNCs have the potential to be used as color converters in liquid crystal displays (LCDs).
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yi Duan,Xiaopeng Qi,Xiangtao Bai,Tianwei Yu,Yanlong Wu,Zenghua Chang,Jiantao Wang
Argyrodite Li 6-x PS 5-x Cl 1+x with high ionic conductivity and excellent mechanical performance is an attractive solid electrolyte candidate for all-solid-state lithium batteries (ASSLBs). Adjusting Cl content is an effective strategy to enhance the ionic conductivity, however its effect on the thermal stability remain uncovered. Herein, our study shows that the increase of Cl content in Li 6-x PS 5-x Cl 1+x significantly enhances the ionic conductivity and electrochemical properties but significantly reduces its thermal stability. We reveal that the thermal stability of Li 6-x PS 5-x Cl 1+x is heavily dependent on its Cl content and can be significantly enhanced by elemental doping. LiNi 0.6 Co 0.2 Mn 0.2 O 2 based ASSLBs using Cl-rich argyrodite with pure phase shows better cycle performance. Achievements from this study could serve as a guidance for optimizing and applicating argyrodite solid electrolytes towards high-performance and safe ASSLBs.
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高影响因子
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