TRANSITION METAL CHEMISTRY
·
2014
·Vol. 39
·期 5
·577-584
·
IF 1.402
Li Xin,Bi Cai-Feng,Fan Yu-Hua,Zhang Xia,Wei Xiao-Dan,Meng Xiang-Min
A ternary coordination complex 2Cu(C 14 H 8 NO 3 Cl)(C 12 H 8 N 2 )·3CH 3 OH of a Schiff base (C 14 H 8 NO 3 Cl: 4-chloroanthranilic acid–salicylaldehyde) was synthesized from 4-chloroanthranilic acid, salicylaldehyde, copper acetate and 1,10-phenanthroline and characterized by physicochemical and spectroscopic methods. X-ray crystallography shows that the copper atom is five coordinated by the imine nitrogen, two nitrogen atoms from 1,10-phenanthroline, the hydroxyl oxygen and the carboxylate oxygen atom. The interaction of the complex with calf-thymus DNA was investigated by UV absorption spectroscopy, fluorescence emission spectroscopy and viscosity. In addition, the cleavage reaction with pBR322 supercoiled plasmid DNA was investigated. The complex binds to DNA and also exhibits significant DNA cleavage activity.
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高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 12
·4169-4179
·
IF 2.5
Zhang Tingting,Li Zihui,Liu Ya,Ding Kangjia,Guo Yangfeng,Xu Yiyang,Sun Mengfan,Wang Dongfang,Li Qian
Polytetrafluoroethylene (PTFE) nano-porous membrane has been widely used in various fields due to its excellent thermal stability and chemical stability. However, PTFE nanofiber membranes with simultaneous hydrophobic and oleophobic properties are essential to promote the application of PTFE. Here, based on inorganic/organic nanohybridization, we report a strategy for constructing nanostructures on fibers by adding nanoparticles, such as MOF and ZrO 2 . The results of FTIR and XRD confirmed MOF was synthesized successfully. At the same time, the SEM results showed UiO-66-(COOH) 2 is spherical with an average diameter of 152 nm, and there is no agglomeration, which is suitable for electrospinning. Further, MOF and ZrO 2 were payload into PTFE nanofibers. The results of SEM and AFM confirmed nanostructures will be more uniform and pronounced with the increase of UiO-66-(COOH) 2 content, and nanostructures are most obvious when the content of UiO-66-(COOH) 2 is 15%. The introduced nanostructures can increase the oil contact angle of the PTFE nano-porous membrane to 110° without introducing other groups, and further improve the water contact angle from 133° to 145°. Meanwhile, the introduction of a certain amount of hydrophilia groups can increase the oil contact angle to more than 120°. The simple strategy is of great significance to expand the application of PTFE fiber membrane in dealing with waste water treatment fields. Graphical abstract
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Nano Research
·
2024
·Vol. 17
·期 6
·4924-4933
·
IF 9.5
Fan Yu,Yi Yu,Rong Hongpan,Zhang Jiatao
Carbon-based single-atom catalysts (SACs) have been widely studied in the field of biomedicine due to their excellent catalytic performance. However, carbon-based SACs usually aggregate during pyrolysis, which leads to the reduction of catalytic activity. Here, we describe a method to improve the monodispersion of SACs using silicon dioxide as a protective layer. The decoration of silicon dioxide serves as a buffer layer for individual nanoparticles, which is not destroyed during the pyrolysis process, ensuring the single-particle dispersion of the nanoparticles after etching. This approach increased the hydroxyl groups on the surface of Fe-SAC (Fe-SAC-SE) and improved its water solubility, resulting in a four times enhancement of the peroxidase (POD)-like activity of Fe-SAC-SE (58.4 U/mg) than that of non-protected SACs (13.9 U/mg). The SiO 2 -protection approach could also improve the catalytic activities of SACs with other metals such as Mn, Co, Ni, and Cu, indicating its generality for SACs preparation. Taking advantage of the high POD-like activity, photothermal properties, and large specific surface area of Fe-SAC-SE, we constructed a synergistic therapeutic system (Fe-SAC-SE@DOX@PEG) for combining the photothermal therapy, catalytic therapy, and chemotherapy. It was verified that the photothermal properties of Fe-SAC-SE@DOX@PEG could effectively improve its POD-like activity, exhibiting excellent tumor-killing performance at the cellular level. This work may provide a general approach to improve the performances of SACs for disease therapy and diagnosis.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2023
·Vol. 111
·期 3
·1-8
·
IF 2.7
Hu Xin,Zheng Fengmian,Yin Li,Huang Heyong,Li Shiyin
Colloidal particles, mixture with continuous molecular weight distribution and multiple organic components, is widespread in lake and have significant impact on the retention, migration, transportation, and fate of contaminants in lake ecosystems. Here we extract sedimentary colloids from algal growth dominant area (AD) in Taihu Lake and further separated into four different particle size ranges by cross-flow ultra-filtration (CFUF). The interaction mechanism between colloids and Microcystin-LR (MC-LR) was investigated under different cation conditions by dialysis equilibrium experiment method. Adsorption kinetics research shows the adsorption of MC-LR by colloids follows second-order kinetics and can be simulated by Freundlich isotherms. The effects of different cations on colloids-MC-LR interaction shows the addition of Mg(II) decreased colloids-MC-LR interaction, while Cu(II) increased colloids-MC-LR binding. MC-LR also increased Cu(II) binding to colloids, while MC-LR decreased Mg(II) binding. Therefore, different effect of cations to colloids-MC-LR interaction was proposed.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 302
·期 3
·355-362
·
IF 2.4
Han Fei,Cao Mei,Lin Jiali,Liu Ting,Zhu Xiaoyun,Zhang Yan
The stability and dispersion of Copper (Cu) powders in an aqueous medium impacts their performances. Thus the Cu powder suspensions were prepared by adding different stabilizers—sodium dodecyl sulfate (SDS), sodium dodecylbenzene sulfonate (SDBS), polyvinyl pyrrolidone (PVP), and hexadecyl trimethyl ammonium bromide (CTAB); the best surfactant was selected and its stability and dispersion were studied. The study systematically examined the effect of the stability of suspensions via sedimentation analysis, including solid–liquid ratio, the concentration of stabilizer, and dispersion time. The particle size, the stability of suspensions, phase composition, and microstructure of Cu powders were characterized by laser particle size analyzer, zeta potential, X-ray diffraction (XRD), transmission electron microscope (TEM), and scanning electron microscope (SEM). The results indicate that the stability of the suspension is improved with the addition of PVP due to the steric hindrance of PVP, and the growth and agglomeration of particles are retarded by the formation of a thick hydration layer with the optimizing concentrations, dispersion time, and solid–liquid ratio 10 g/L, 30 min, and 1:25, respectively.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·Vol. 34
·期 6
·2501-2509
·
IF 3.9
Lin Jing,Feng Mengna
Ceramic/polymer dielectrics with excellent thermal stability and high dielectric performance exhibit great potential in advanced capacitor applications. It is still a major challenge for ceramic/polymer dielectrics to obtain high dielectric constant at low content while maintaining excellent flexibility. To alleviate this issue, here, a flexible polymer dielectric composite consisting of poly(arylene ether nitrile) (PEN) matrix and barium titanate filler coated by Carbon and polypyrone (h-BT@C@PPy) was put forward in this work. The as-prepared composite films displayed high dielectric constant, comparable low loss and favorable interfacial binding due to the hydrogen-bonding interaction between –NH of h-BT@C@PPy and –CN of PEN, effectively promoting the interfacial polarization and remedying the internal interface defects between h-BT and PEN. Consequently, an addition of 8 wt% h-BT@C@PPy into PEN matrix raised the dielectric constant from 3.82 to 13.3 at 1 kHz, while maintaining relatively low dielectric loss (0.05@1 kHz). However, the breakdown strength showed a decreasing trend with the lowest value of 60.37 kV mm −1 . Meanwhile, the better flexibility, outstanding thermal stability (the 5% weight loss above 500 °C) as well as excellent permittivity-temperature stability was also delivered by the PEN-based composite films. This strategy furnishes a perspective to design ceramic/polymer dielectrics with high- k achieved at low filler content for the applications of organic film capacitors.
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高影响因子
Science China-Chemistry
·
2013
·Vol. 57
·期 3
·397-401
·
IF 1.327
Zhang QiBo,Hua YiXin,Wang Rui
Direct electroreduction of solid cuprous chloride to prepare copper powder in a “neutral” ambient-temperature ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid (BMIMBF 4 ) was investigated. Cyclic voltammetry of the CuCl powder in a Pt-powder cavity microelectrode exhibited that solid CuCl can be electrochemical reduced in the ionic liquid. Chronoamperometry of the salt powder filled Mo-cavity electrode (current collector) in the ionic liquid further demonstrated the conversion of chloride-to metal inside the cavity, as confirmed by scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction spectra.
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BMC INFECTIOUS DISEASES
·
2022
·Vol. 22
·期 1
·1-12
·
IF 3.667
An Qingyu,Wu Jun,Meng Jun,Zhao Zhijie,Bai Jin Jian,Li Xiaofeng
Background Acquired immunodeficiency syndrome (AIDS) is a malignant infectious disease with high mortality caused by HIV (human immunodeficiency virus, and up to now there are no curable drugs or effective vaccines. In order to understand AIDS’s development trend, we establish hybrid EMD-BPNN (empirical modal decomposition and Back-propagation artificial neural network model) model to forecast new HIV infection in Dalian and to evaluate model’s performance. Methods The monthly HIV data series are decomposed by EMD method, and then all decomposition results are used as training and testing data to establish BPNN model, namely BPNN was fitted to each IMF (intrinsic mode function) and residue separately, and the predicted value is the sum of the predicted values from the models. Meanwhile, using yearly HIV data to established ARIMA and using monthly HIV data to established BPNN, and SARIMA (seasonal autoregressive integrated moving average) model to compare the predictive ability with EMD-BPNN model. Results From 2004 to 2017, 3310 cases of HIV were reported in Dalian, including 101 fatal cases. The monthly HIV data series are decomposed into four relatively stable IMFs and one residue item by EMD, and the residue item showed that the incidence of HIV increases firstly after declining. The mean absolute percentage error value for the EMD-BPNN, BPNN, SARIMA (1,1,2) (0,1,1) 12 in 2018 is 7.80%, 10.79%, 9.48% respectively, and the mean absolute percentage error value for the ARIMA (3,1,0) model in 2017 and 2018 is 8.91%. Conclusions The EMD-BPNN model was effective and reliable in predicting the incidence of HIV for annual incidence, and the results could furnish a scientific reference for policy makers and health agencies in Dalian.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2011
·Vol. 399
·期 7
·2503-2509
·
IF 3.841
Chen Yang,Zhang Yanqin
Functionalization of the surfaces of silica particles is often the first step in their various applications. An improved heterogeneous Fmoc-Cl fluorescent assay using an aqueous solution was developed to detect the number of amino groups on solid-phase supports. The fluorescent Fmoc-Cl method is 50-fold more sensitive than the current UV assay using an organic solvent. This method, together with the homogeneous fluorescamine and OPA assays, is used to detect amino groups on the silica particle surface. The accuracy and effect factors of these methods were examined and the assays were optimized. The results showed that the amine groups on silica particles can produce stronger fluorescence than small amine molecules in solution, because the porous structure of the particle surface is a more hydrophobic environment. The number of active amino groups that can be conjugated with biomolecules is much less than the total number of amino groups on the silica particle. Compared with physical methods, chemical assays involving direct reaction with amino groups would furnish the closest result to the number of active amino groups on the particle surface.
Fluorescence emission of Fmoc-Cl in aqueous solution and linear correlation between intensity and concentration
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CELLULOSE
·
2023
·Vol. 30
·期 6
·3729-3743
·
IF 5.7
Zhang Cuizhi,Gao Kairu,Chu Xiaomeng,Liu Shaojie,Li Peixin,Tang Erjun
Polyamidoamine (PAMAM) encapsulated nano-Ag is a highly efficient catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in water. However, PAMAM is easily soluble in water, making the nano-Ag catalyst difficult to recycle. In this work, carboxymethyl cellulose (CMC) was oxidized by sodium periodate to obtain oxidized carboxymethyl cellulose (CMC-CHO) containing aldehyde groups. PAMAM encapsulated nano-Ag (G4.0-PAMAM-Ag) was prepared with G4.0-PAMAM as template. Through the Schiff base reaction between CMC-CHO and G4.0-PAMAM-Ag, the CMC/PAMAM hydrogel loaded with nano-Ag (CMC-PAMAM-Ag) was prepared. The catalytic performance of CMC-PAMAM-Ag in the reduction of 4-NP to 4-AP in water was studied. It was found that its time required for accomplishing the reduction reaction was only 9 min, similar to that of free G4.0-PAMAM-Ag (8 min). Turnover frequency was as high as 169 h −1 , much higher than that of the cellulose/PAMAM composite supported nano-Ag (4.2 h −1 ) and dextrann/PAMAM hydrogel supported nano-Ag (40.2 h −1 ). The recovered hydrogel was characterized by X-ray photoelectron spectroscopy and it was found that the imine bonds in the fresh hydrogel were reduced to the amine bonds in the recovered hydrogel, improving the stability of hydrogel. The recovered hydrogel still had a good catalytic performance.
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JOURNAL OF MATERIALS RESEARCH
·
2026
·
IF 2.9
Li Fengyin,Jiang Xueao,Ma Ning,Zhao Min,Lv Yang,Cao Xuefei,Hu Zewei,Hua Shuai,Zhang Limin,Wang Renke
Poly(ethylene oxide) (PEO)-based solid polymer electrolytes are attractive for energy storage, especially for solid-state lithium metal batteries, but their use is hindered by slow Li + transport and unstable Li interfaces. Here, we report a low-loading ionic liquid (IL)-assisted local solvation strategy by incorporating a highly concentrated LiTFSI/sulfolane component and a small amount of Py14TFSI into PEO. Spectroscopy and DFT calculations show that Py14TFSI acts as a coordination regulator rather than a simple plasticizer, decreasing Li + -TFSI − contact ion pairs from 58% in PS to 41% in PSP and promoting more weakly coordinated TFSI − species. The optimized PSP electrolyte delivers an ionic conductivity of 0.116 mS cm −1 at 30 °C, an activation energy of 28.55 kJ mol −1 , and a Li + transference number of 0.40. Consequently, Li||PSP||Li cells cycle for 250 h at 1 mA cm −2 , and LFP||Li cells retain 97% capacity after 150 cycles. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 14
·12882-12898
·
IF 2.741
Zhang Jian,Hou Dibo,Wang Ke,Huang Pingjie,Zhang Guangxin,Loáiciga Hugo
The detection of organic contaminants in water distribution systems is essential to protect public health from potential harmful compounds resulting from accidental spills or intentional releases. Existing methods for detecting organic contaminants are based on quantitative analyses such as chemical testing and gas/liquid chromatography, which are time- and reagent-consuming and involve costly maintenance. This study proposes a novel procedure based on discrete wavelet transform and principal component analysis for detecting organic contamination events from ultraviolet spectral data. Firstly, the spectrum of each observation is transformed using discrete wavelet with a coiflet mother wavelet to capture the abrupt change along the wavelength. Principal component analysis is then employed to approximate the spectra based on capture and fusion features. The significant value of Hotelling’s T 2 statistics is calculated and used to detect outliers. An alarm of contamination event is triggered by sequential Bayesian analysis when the outliers appear continuously in several observations. The effectiveness of the proposed procedure is tested on-line using a pilot-scale setup and experimental data.
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高影响因子
危险品化学品经营许可证（带存储）