TRIBOLOGY LETTERS
·
2020
·Vol. 68
·期 4
·1-12
·
IF 2.566
Wu Lili,Lei Xue,Zhang Yujuan,Zhang Shengmao,Yang Guangbin,Zhang Pingyu
Oleylamine (hereinafter referred to as OM)-modified CeO 2 nanoparticles were synthesized by a one-pot pyrolysis method. The tribological properties of the as-prepared CeO 2 nanoparticles as the lubricant additive in poly-alpha olefin (PAO) were investigated with a four-ball machine, and their lubricating mechanism was discussed in relation to worn surface analyses by SEM, EDS, and XPS. Findings indicate that these nanoparticles exhibit good dispersibility as well as excellent anti-wear ability in PAO. This is because OM-modified CeO 2 nanoparticles can catalyze the oxidation of metallic Fe to form ferrite oxide-containing tribo-film. Under the condition of ASTM D2266-2001, the same lowest WDS was obtained at the concentration of 0.2 wt% and 1.8 wt%. When the concentration of CeO 2 is 0.2 wt%, a compact catalytic oxidation tribo-film is formed, which has more outstanding long-term anti-wear ability. When 1.8 wt% CeO 2 is added, the tribo-film formed is the combination of catalytic oxidation film and ceria deposition film, which has more significant bearing capacity.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 3
·1111-1120
·
IF 2.647
Wang Zhiwei,Ru Juanjian,Hua Yixin,Bu Jiaojiao,Geng Xiao,Zhang Wenwen
Tin (Sn) powders with pyramid chain and dendrite structures are successfully prepared by electrodeposition in choline chloride-ethylene glycol deep eutectic solvent (ChCl-EG DES) at 343 K. Cyclic voltammetry demonstrates that increasing SnCl 2 concentration from 30 to 70 mM is favorable for the reduction of Sn(II) ions to metallic Sn on Ni electrode. The roles of current density (10–30 mA·cm −2 ) and SnCl 2 concentration (30–70 mM) on the current efficiency and energy consumption are discussed during the electrodeposition of Sn powders. Experimental results show that the current efficiency and energy consumption are 88.7% and 347.1 kW·h·t −1 , respectively at 20 mA·cm −2 and 50 mM SnCl 2 . Besides, the micromorphology and crystal structure of Sn powders are analyzed by FESEM and XRD. Morphology analysis manifests that pyramid chains and dendrites in length of 30–220 μm are the dominate morphologies and the formation mechanism of the pyramid chain is also discussed. Moreover, XRD analysis and crystal texture reveal that metallic Sn is obtained with a body-centered tetragonal crystal structure. The (101) plane is the preferred at higher current density, while the (200) plane gets the strongly preferred orientation as SnCl 2 concentration increases. Graphical abstract
Sn powders electrodeposited from SnCl 2 -ChCl-EG solution and growth mechanism of the pyramid chain structure.
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CELLULOSE
·
2021
·Vol. 28
·期 3
·1781-1793
·
IF 5.044
Chen Yu,Wan Caiyan,Liu Shidong,Wang Peng,Zhang Guangxian
Abstract A novel flame retardant with high P content and multi-reactive ammonium phosphorus acid groups Bis(2-hydroxyethyl) imino tris-(hydroxymethyl)-methane methylphosphonic acid (ABTMPA) was synthesized for treatment of cotton fabrics. The ABTMPA treated cotton fabrics were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and fourier transform infrared spectroscopy (FTIR). The structure of the ABTMPA was analyzed by the nuclear magnetic resonance. The limiting oxygen index (LOI) was used to evaluate the flame retardancy and durability of the treated cotton fabrics. The LOI value of cotton fabric treated with 31% ABTMPA was 50.2%, and an LOI of 41.2% was retained after 50 laundering cycles. Micro-burning calorimetry showed that total heat of combustion of the treated cotton fabric was reduced, and the char residual was much higher than that of pure cotton. Thermogravimetric (TG) and TG-FTIR analyses indicated that the flame retardant ABTMPA changed the thermal decomposition pathway of cellulose, and the combustible gases generated at high temperature was much lower than that of pure cotton. Flame retardant treated cotton fabric had excellent flame retardancy and durability. In addition, whiteness and breaking strength are well maintained. Therefore the ABTMPA shows the potential of flame retardants in future commercial applications. Graphic abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 10
·12909-12917
·
IF 3.056
Ren Jingyu,Li Jie,Lv Lei,Wang Jian
Ionic liquids (ILs) are a kind of promising extractants for removing undesirable organics from industrial wastewater and crude oil, etc. Herein, IL regeneration by ozonation was proposed for its recycling. 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4 ) and phenol were used as the representative IL and organic matter, respectively. The regeneration performance, stability of [Bmim]BF 4 , and roles of hydrogen bonds between O 3 and [Bmim]BF 4 in the phenol removal were studied. The experimental results showed that 90.2% of phenol was degraded in [Bmim]BF 4 after ozonation treatment for 30 min with the O 3 concentration of 1.2 mg/L. The nonvolatility of [Bmim]BF 4 -made phenol was adequately degraded, while the concentration of phenol increased during ozone treatment in the conventional extractants (ethanol, ethyl acetate, and dichloromethane) due to their high volatility. The reuse experiments, spectra of Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy indicated that [Bmim]BF 4 was steady under the ozonation process. Density functional theory simulation confirmed that hydrogen bonds between [Bmim] + and O 3 could be formed, and calculational results of Hirshfeld charges indicated that the nucleophilicity of O 3 was enhanced by the hydrogen bonds. The enhanced nucleophilicity resulted in the increase of phenol degradation efficiency by ozonation, and the synergistic effect between O 3 and ILs was proportional to the hydrogen bond donor ability of ILs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 19
·16539-16547
·
IF 2.22
Li Jian,Chen Chen,Li Jialin,Li Shijun,Dong Chengjun
Tin-glycerate (Sn-Gly) spheres were synthesized through a simple solvothermal strategy, which was further thermally converted into SnO 2 . It is found that the loose SnO 2 spheres have been built up from nanoparticles with about 10 nm in size. The use of such SnO 2 nanostructures was further performed for low-ppm-level acetone detection. The results showed that the SnO 2 presented response of 123 to 100 ppm acetone vapor at 260 °C. The sensor also exhibited rapid response/recovery time (24.5 s/6.5 s), low detection limit (1.5 at 1 ppm), excellent selectivity, and good reproducibility. Especially, a good linearity ranging from 1 to 100 ppm acetone was fitted, making it a promising candidate for acetone detection.
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Nano Research
·
2020
·Vol. 13
·期 12
·3321-3329
·
IF 8.183
Xie Heping,Lan Cheng,Chen Bin,Wang Fuhuan,Liu Tao
The development of noble-metal-free electrocatalysts for water splitting is indispensable for the efficient production of hydrogen fuel. Herein, a Co-doped Ni-Mo phosphide nanorod arrays fabricated on porous Ni foam was shown to be an efficient binder-free electrocatalyst for water splitting. This catalyst featured exceptional activity, exhibiting an overpotential of 29 mV at a current density of 10 mA·cm −2 for the hydrogen evolution reaction, whereas the corresponding precatalyst exhibited an overpotential of 314 mV at a current density of 50 mA·cm −2 for the oxygen evolution reaction. The achieved electrocatalytic performance provided access to a simple water splitting system, affording a current density of 10 mA·cm −2 at 1.47 V in 1 M KOH electrolyte. Density functional theory results indicated that Co doping and phosphorization were responsible for the high electrocatalytic performance. Thus, this work paves the way for the development of novel noble-metal-free electrocatalysts for practical H 2 production via water splitting.
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Bio-Design and Manufacturing
·
2020
·Vol. 3
·期 4
·373-382
·
IF 4.095
Xuan Chengkai,Liu Xuemin,Lai Chen,Shi Xuetao
There is a consensus that the prevention of wound infection should be achieved in the following ways: (1) closing the wound to protect it from extra infection; (2) an antibacterial agent that could kill endogenous bacteria. However, existing bulk two-dimensional antibacterial materials show inefficient adhesion to wounds with complex morphology and thus cause the prevention of wound closure. Reducing the thickness of bulk two-dimensional materials to less than 100 nanometres endows them with great flexibility, which could allow them to adhere to wounds with complex morphology by only physical adhesion. Herein, a broad-spectrum and efficient antimicrobial peptide (AMP) was introduced to biocompatible methacrylated gelatine (GelMA) with multiple modification sites, which served as an inner antibacterial layer. After being combined with a biodegradable and good mechanical poly-l-lactide (PLLA) outer layer through plasma-treatment-assisted spin coating, we finally constructed bilayered antibacterial nanosheets with a thickness of approximately 80 nm. These bilayered nanosheets possess good adhesion to surfaces with complex topography and thus achieve better wound closure than other bulk two-dimensional materials. Moreover, this AMP-grafted conjugation shows minimal cytotoxicity compared with Ag + antibacterial agents, and the antibacterial rate of nanosheets is dependent on the graft rate of AMP. We suggest that this bilayered antibacterial nanosheet might be an advanced anti-infection dressing for wound treatment in clinical settings.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 9
·1-12
·
IF 6.232
Liu Lixia,Yang Minli,He Muyi,Liu Tong,Chen Fengming,Li Yinlong,Feng Xuesong,Zhang Yuan,Zhang Feng
A novel magnetic dual-template molecularly imprinted polymer (DMIP) was prepared with methyl-parathion and quinalphos as templates. For comparison, a series of single-template polymers with only methyl-parathion (MPMIP) or quinalphos (QPMIP) as template as well as a non-imprinted polymer (NIP) in the absence of the template, were synthesized using the same procedure of DMIP. The obtained MIPs were characterized by scanning electron microscopy(SEM), Fourier transform infrared (FT-IR) spectroscopy, vibrating sample magnetometer (VSM), and X-ray diffraction (XRD). The properties including kinetic effect, thermodynamic effect, selectivity, and reusability of MIPs were investigated . Only DMIP possessed high affinity and good recognition for all twelve OPPs including quinalphos, isazophos, chlorpyrifos-methyl, chlorpyrifos, methidathion, triazophos, profenofos, fenthion, fenitrothion, methyl-parathion, parathion, and paraoxon in comparison to MPMIP, QPMIP, or NIP. Moreover, DMIP was used as magnetic solid phase extraction (MSPE) sorbent for the pre-concentration of twelve OPPs in cabbage samples. The developed DMIP-MSPE-GC-MS method showed high sensitivity, low LODs (1.62–13.9 ng/g), fast adsorption equilibrium (10 min), and acceptable spiked recoveries (81.5–113.4%) with relative standard deviations (RSD) in the range 0.05–7.0% ( n = 3). The calibration plots were linear in the range 10–800 ng/mL with coefficients of determination ( R 2 ) better 0.99 for all twelve compounds. These results suggest that the DMIP is applicable for rapid determination and high throughput analysis of multi-pesticide residues.
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NAUNYN-SCHMIEDEBERGS ARCHIVES OF PHARMACOLOGY
·
2020
·Vol. 394
·期 4
·765-773
·
IF 2.05
Gao Jie,Yuan Guanyin,Xu Zhan,Lan Luyao,Xin Wenkuan
Bile acids are endogenous amphiphilic steroids from the metabolites of cholesterol. Studies showed that they might contribute to the pathogenesis of cardiopathy in cholestatic liver diseases. Chenodeoxycholic acid (CDCA) and deoxycholic acid (DCA) is associated with colon cancer, gallstones, and gastrointestinal disorders. However, little information is available regarding their cardiac effects. Here, we reported that CDCA (100 μM) and DCA (100 μM) significantly increased the left ventricular developed pressure of the isolated rat hearts to 122.3 ± 5.6% and 145.1 ± 13.7%, and the maximal rate of the pressure development rising and descending (± dP/dt max ) to 103.4 ± 17.6% and 124.4 ± 37.7% of the basal levels, respectively. They decreased the heart rate and prolonged the RR, QRS, and QT intervals of Langendorff-perfused hearts in a concentration-dependent manner. Moreover, CDCA and DCA increased the developed tension of left ventricular muscle and the cytosolic Ca 2+ concentrations in left ventricular myocytes; these functions positively coordinated with their inotropic effects on hearts. Additionally, CDCA (150 μM) and DCA (100 μM) decreased the sinoatrial node beating rate to 80.6 ± 3.0% and 79.7 ± 0.9% of the basal rate (334.2 ± 10.7 bpm), respectively. These results were consistent with their chronotropic effects. In conclusion, CDCA and DCA induced positive inotropic effects by elevating the Ca 2+ in left ventricular myocytes. They exerted negative chronotropic effects by lowering the pace of the sinoatrial node in rat heart. These results indicated that the potential role of bile acids in cardiopathy related to cholestasis.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 36
·45605-45617
·
IF 3.056
Zhou Anran,Wang Yonglei,Sun Shaohua,Xin Xiaodong,Wang Mingquan,Zhao Qinghua,Zhu Huanhuan,Jia Ruibao
The addition of Fe 3+ to TiO 2 is one of the effective methods to inhibit the recombination of photogenerated electrons and holes and thus improve the photocatalytic activity of TiO 2 . The effect of PVDF-PVP-TiO 2 -FeCl 3 (PPTFe) membrane filtration-photocatalytic system on the removal of trace concentration of sulfadiazine (SD) in water was evaluated. A two-factor four-level experiment was established to optimize 16 self-made modified membranes. The optimal membrane was then characterized in seven tests (SEM, EDS, membrane pure water flux, contact angle, porosity, mean pore size, ATR-FTIR), resulting in the optimal ratio (PPTFe membrane with 1.2 wt%TiO 2 and 0.8 wt%FeCl 3 ). Compared with the original membrane, the pore number, pore size, permeability, and hydrophilicity of the PPTFe membrane were all enhanced. The removal efficiency (92.63%) of SD by PPTFe membrane filtration-photocatalysis system was investigated. The reaction rate (0.0214 min −1 ) of the removal SD of the system was determined according to the pseudo-first-order kinetic model. The removal performance of membrane type, pH, and water quality parameters (Cl − , SO 4 2− , NO 3 − , HA) on PPTFe membrane filtration-photocatalytic system were also made a deep inquiry. The results reflected that acidic conditions (pH = 3) were beneficial to SD removal, the presence of Cl − , SO 4 2− , and HA could inhibit SD removal, while the existence of NO 3 − was unaffected. Furthermore, the removal rate of SD in the actual water body was displayed well in this system. Finally, the possible photocatalytic degradation mechanism was proposed. Graphical abstract
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 26
·7227-7236
·
IF 3.637
Li Jie,Ma Miaoxia,Zhang Chenhui,Lu Rui,Zhang Lingyi,Zhang Weibing
A molecularly imprinted polymer and metal organic framework were combined to prepare protein imprinted material. MOF-74(Ni) was used as a matrix to prepare surface-imprinted material with lysozyme as a template and polydopamine as an imprinting polymer. MOF-74(Ni) not only provides a large surface area (150.0 m 2 /g) to modify the polymer layer with more recognition sites ( Wt (Ni) = 42.24%), but also facilitates the immobilization of lysozyme by using the chelation between Ni 2+ of the MOF-74(Ni) and protein. The thin polydopamine layer (10 nm) of the molecularly imprinted material (named MOF@PDA-MIP) enables surface imprinting. Benefiting from the thin polymer layer, MOF@PDA-MIP reached adsorption equilibrium within 10 min. The maximum adsorption capacity reaches 313.5 mg/g with the highest imprinting factor (IF) of 7.8. The specific recognition sites can distinguish target lysozyme from other proteins such as egg albumin (OVA), bovine serum albumin (BSA) and ribonuclease A (RNase A). The material was successfully applied to separation of lysozyme from egg white.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2020
·Vol. 146
·期 4
·1629-1639
·
IF 2.731
Song Qingyi,Wu Hongjuan,Liu Hao,Wang Tian,Meng Weihua,Qu Hongqiang
A series of chitosan-modified inorganic oxyacid salt flame retardants (IOS-CS) were synthesized and used as flame retardants to improve the fire resistance of poly(vinyl chloride) (PVC) composites while improving the mechanical properties of the materials. The thermal stability of the material was analyzed by TG test; the flame-retardant and smoke suppression properties were evaluated by limiting oxygen index (LOI) and cone calorimeter test, and the mechanical properties were analyzed by tensile test and impact test. The TG results showed that the addition of flame retardant can promote the early cross-linking decomposition of PVC composites, not only advance the decomposition temperature of the material but also promote the formation of char layer and increase the char residual content. LOI and cone calorimeter test results showed that stannate chitosan (Sn-CS) can improve flame retardant and smoke suppression more effectively than other samples. Compared with pure PVC, the addition of Sn-CS increased its LOI from 26.6 to 30.5% and reduced the total heat release value and total smoke release by 18.23% and 52.55%, respectively. At the same time, the addition of the flame retardants had no large deterioration effect on the mechanical properties of the material. The tensile properties of flame-retardant PVC were slightly reduced compared with pure PVC, and the impact resistance was even improved to some extent.
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危险品化学品经营许可证（带存储）