Polymers
·
2018
·Vol. 10
·期 5
·557
·
IF 2.935
Jinqiu Yang,Shenzhou Lu,Tieling Xing,Guoqiang Chen
Atom transfer radical polymerization (ATRP) is a “living”/controlled radical polymerization, which is also used for surface grafting of various materials including textiles. However, the commonly used metal complex catalyst, CuBr, is mildly toxic and results in unwanted color for textiles. In order to replace the transition metal catalyst of surface-initiated ATRP, the possibility of HRP biocatalyst was investigated in this work. 2-hydroxypropyl methacrylate (HPMA) was grafted onto the surface of silk fabric using the horseradish peroxidase (HRP) biocatalyzed ATRP method, which is used to improve the crease resistance of silk fabric. The structure of grafted silk fabric was characterized by Fourier transform infrared spectrum, X-ray photoelectron spectroscopy, thermogravimetic analysis, and scanning electron microscopy. The results showed that HPMA was successfully grafted onto silk fabric. Compared with the control silk sample, the wrinkle recovery property of grafted silk fabric was greatly improved, especially the wet crease recovery property. However, the whiteness, breaking strength, and moisture regain of grafted silk fabric decreased somewhat. The present work provides a novel, biocatalyzed, environmentally friendly ATRP method to obtain functional silk fabric, which is favorable for clothing application and has potential for medical materials.Keywords:horseradish peroxidase;atom transfer radical polymerization;bio-catalysis;silk
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Lingfei Ma,Chaoyi Wang,Haipu Li,Fangyuan Peng,Zhaoguang Yang
Geosmin (GSM) and 2-methylisoborneol (2-MIB) are two common odor compounds in drinking water . In this paper, the performance of UV/chlorine was compared with that of chlorine and UV to degrade GSM (100 ng L −1 ) and 2-MIB (100 ng L −1 ) in water. UV/chlorine was further exploited, and a steady-state kinetic model was used to conduct a detailed study on efficiency, rate, reactive species and pathway. The results showed that UV/chlorine greatly could improve the removal ratio to 90% within 5 min, from approximately 20% with only UV or dark chlorine in 60 min. The removal ratio and rate depended on UV light intensity , free chlorine dosage, reaction time and water quality parameters (e.g. pH, concentrations of HCO 3 − and Cl − ). Among these factors, the first two obviously could accelerate the rate and increase the ratio. The degradation was also significantly improved in an acidic condition, while alkaline conditions and HCO 3 − had inhibitory effects, and Cl − created no difference. Contributions of OH and Cl to the degradation of 2-MIB and GSM were further revealed, and OH was found to be the most important reactive species. In the UV/chlorine process, 6 degradation byproducts of 2-MIB, including 1 alcohol, 2 ketones, and 3 olefins , were identified, and 14 degradation byproducts of GSM, including 6 ketones, 1 aldehyde, 2 alcohols, 3 naphthenes , and 2 olefins, were found by using solid-phase microextraction coupled to gas chromatography-mass spectrometry. The possible degradation pathways of GSM and 2-MIB in UV/chlorine thus were proposed.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Linan Wang,Shuxian Zhuang,Liu Wang,Na Wang,Hengliang Mo,Yang Tang,Yongmei Chen,Yanzhi Sun,Pingyu Wan
Co(OH) 2 nanoflakes integrating with Cu nanoparticles were deposited on nickel foam (CuNps-Co(OH) 2 Nfs/Ni f ) by a green and facile one-step deposition method and used for non-enzymatic glucose sensors. The CuNps-Co(OH) 2 Nfs/Ni f composite was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy and high resolution transmission electron microscopy. Electrochemical oxidation of glucose on the CuNps-Co(OH) 2 Nfs/Ni f composite was investigated by chronoamperometry and cyclic voltammetry. The prepared CuNps-Co(OH) 2 Nfs/Ni f electrode shows not only an extremely high sensitivity of 42.7 mA mM −1 cm −2 in the concentration range from 1 to 250 μM for glucose detection but also an obvious current response to glucose at a level of 1 μM with a low detection limit of 73 nM (S/N = 3). Moreover, the glucose sensor based on CuNps-Co(OH) 2 Nfs/Ni f also exhibits high recovery ratio toward real sample analysis. This work indicates that the fast electron transfer, large surface area, and highly effective active sites based on the hierarchical structure of ultra-thin and open-interlaced Co(OH) 2 Nfs interspersed by CuNps contribute to the excellent performance of CuNps-Co(OH) 2 Nfs/Ni f electrodes. The proposed one-step preparation of hierarchical nanostructure of CuNps and Co(OH) 2 Nfs provides a promising and efficient strategy in the development of outstanding non-enzymatic glucose biosensors.
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Food & Function
·
2018
·Vol. 9
·期 12
·6155-6164
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IF 3.289
Lang Zhang,Ya Fan,Hanwen Su,Li Wu,Yuying Huang,Lei Zhao,Bing Han,Guangwen Shu,Meixian Xiang,Jin-Ming Yang
The objective of this study was to investigate the anti-inflammatory effect of chlorogenic acid methyl ester (CME) and the molecular mechanism involved, through using non-infectious inflammation and infectious inflammation animal models as well as lipopolysaccharide (LPS)-stimulated mouse macrophage RAW264.7 cell models. Our results demonstrated that CME markedly inhibited ear swelling, paw swelling and granuloma swelling, and decreased intraperitoneal capillary permeability in non-infectious inflammation. Moreover, CME significantly alleviated the pathological damage of the lung tissue, reduced the levels of PGE2 and IL-1β in the serum and the protein expression levels of related-inflammatory factors in the lung tissue of LPS-induced mice with acute lung injury (ALI). In addition, CME affected the RAW264.7 cell cycle and inhibited the protein expressions of COX-2 and NLRP3 and prevented the phosphorylation of NF-κB p65 in RAW264.7 cells treated with LPS. These observations not only validated the anti-inflammatory effects of CME, but also revealed the underlying molecular basis, which involves the down-regulation of the expression of inflammatory factors and blockade of the COX-2/NLRP3/NF-κB signaling pathway.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 30
·期 2
·1626-1636
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IF 2.324
Li Yuexuan,Duan Yugang
Silicon coupling reagent is regarded as a common additive on surface treatment of polymer due to its high bonding strength and low cost. In this paper, a series of γ-(2, 3-epoxypropoxy) propyltrimethoxysilane (KH560)-based reduced graphene oxide (RGO)@Fe 3 O 4 (KH560/RGO@Fe 3 O 4 ) composites with different ratio of Fe 3 O 4 nanoparticles (NPs) are synthesized by a facile hydrothermal method. It is confirmed that the silicon reagent KH560, as a hopeful candidate for increasing the RGO lattice defects, is favorable to improve the electromagnetic wave absorption. Meanwhile, the microwave attenuation mechanism of KH560/RGO@Fe 3 O 4 composite suggests that the dielectric loss mainly causes by multiple Debye dipolar relaxation and its magnetic loss comes from the eddy-current effect of Fe 3 O 4 NPs over the high frequency range. In consequence, the KH560/RGO@Fe 3 O 4 composite endows the excellent absorption performance, the reflection loss (RL) value is optimized to − 25 dB at 14.1 GHz with a thickness of 3 mm and the maximum frequency bandwidth for RL < − 10 dB is 4.1 GHz with a thickness of 4 mm.
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Polymers
·
2018
·Vol. 10
·期 5
·498
·
IF 2.935
Wanyong Yu,Na Han,Yongqiang Qian,Xingxiang Zhang,Wei Li
Cellulose was premodified by short-chain fatty acid anhydrides, such as acetic anhydride (CA), propionic anhydride (CP), and butyric anhydride (CB), followed by grafting of polyoxyethylene (2) hexadecyl ether (E2C16) using toluene-2,4-diisocyanate as a coupling agent. The feeding molar ratio of E2C16and the anhydroglucose unit (AGU) was fixed at 4:1, and then a series of CA-g-E2C16, CP-g-E2C16, and CB-g-E2C16copolymers were successfully prepared. The structures and properties of the copolymers were characterized using FTIR (fourier transform infrared spectra),1H-NMR (Proton nuclear magnetic resonance), DSC (Differential scanning calorimeter), POM (polarized light microscopy), TGA (thermogravimetric analysis) and WAXD (wide-angle X-ray diffraction). It was shown that with the anhydride/AGU ratio increasing, the degree of substitution (DS) value of E2C16showed a trend of up first and then down. With the carbon chain length increasing, the DS value of E2C16continuously increases. The phase transition temperature and thermal enthalpy of the copolymers increased with an increasing DS value of E2C16. When the ratio of CB/AGU was 1.5:1, the DS of E2C16was up to the maximum value of 1.02, and the corresponding melting enthalpy and crystallization enthalpy were 32 J/g and 30 J/g, respectively. The copolymers showed solid–solid phase change behavior. The heat resistant temperature of cellulose-based solid–solid phase change materials was always higher than 270 °C. After the grafting reaction, the crystallinity of E2C16decreased, while the crystal type was still hexagonal.Keywords:cellulose;fatty acid anhydride;polyoxyethylene (2) hexadecyl ether;solid–solid phase change
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2018
·
IF 3.118
Yuzhu Ye,Yuanlu Shan,Caiying Bao,Yi Hu,Liangrong Wang
Background/aims Ginsenoside Rg1 is regarded as the primary bioactive ingredient in Panax notoginseng that has been well recognized for its protective effects against ischemia/reperfusion (IR) injury. However, the mechanisms still remain elusive. Our study aims to investigate the effects of Rg1 against lung injury induced by hind-limb IR in rats. Methods Twenty-four Sprague Dawley rats were randomly submitted to sham operation (SM group), hind-limb IR (IR group), hind-limb IR + Rg1 (Rg1 group), and hind-limb IR + Pro-DTC group (PD group). All the rats except those in SM group were subjected to 3 h of ischemia followed by 6 h of reperfusion , and extra intravenous Rg1 and pyrrolidine dithiocarbamate (Pro-DTC), a selective inhibitor of nuclear factor kappa B (NF-κB), was administered intravenously before ischemia in the Rg1 and PD group, respectively. The activities of myeloperoxidase (MPO), superoxide dismutase (SOD) and catalase (CAT), as well as protein expressions of NF-κB p65 and cyclooxygenases-2 (COX-2) in lung tissue, and thromboxane B2 (TXB2) and 6-keto-ProstaglandinF 1α (6-keto-PGF 1α ) levels in bronchoalveolar lavage (BAL) fluid were detected. Morphological changes, index of quantitative assessment of histologic lung injury (IQA), apoptosis index (AI) and lung Wet/Dry ratio were also evaluated. Results The levels of Wet/Dry ratio, IQA, AI, activities of MPO and 6-keto-PGF 1α /TXB 2 ratio were increased, and NF-κB p65 and COX-2 protein expression were upregulated, while SOD and CAT levels were decreased in lung tissue in IR group as compared with SM group ( p < 0.05), all the alterations could be significantly reversed by Rg1 or Pro-DTC pretreatment ( p < 0.05). And Rg1 and Pro-DTC also significantly attenuated the pulmonary histological abnormalities induced by IR. Conclusion Ginsenoside Rg1 potentially attenuated lung injury induced by hind-limb IR by regulating NF-κB/COX-2 signaling pathway .
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 22
·15487-15499
·
IF 2.993
Yang Ming,Rao Richuan
In this work, nonmetallic S was doped into hierarchical Ni(OH) 2 hollow microspheres by ethanol solvothermal method using thiourea as sulfur source. Although the morphology of precursor Ni(OH) 2 is maintained, the surface states and pore properties had greatly changed after S doping. Using the as-prepared S-doped Ni(OH) 2 as adsorbents for the removal of Congo red (CR), the S-doped Ni(OH) 2 exhibited much better adsorption capacity compared with undoped Ni(OH) 2 . The adsorption behavior of both Ni(OH) 2 and S-doped Ni(OH) 2 followed the pseudo-second-order kinetic model and intraparticle diffusion model. The equilibrium data of Ni(OH) 2 could be better fitted by Langmuir model, while Freundlich model could be better used to describe the S-doped Ni(OH) 2 with a much larger adsorption capacity toward CR. The tuned microstructure and changed surface states of adsorbent after S doping may be responsible for the enhanced adsorption performance. Therefore, the doping of S species into hierarchical Ni(OH) 2 paves a new way to tune the microstructure and surface states of Ni-based materials.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jing Zeng,Zulai Cao,Yang Yang,Yunhui Wang,Yueying Peng,Yiyong Zhang,Jing Wang,Jinbao Zhao
The commercial applications of rechargeable magnesium batteries (RMBs) are hindered by the slow diffusion kinetic of Mg 2+ ions in cathode materials. To overcome this problem, we design a new Na-Mg hybrid battery with the NaTi 2 (PO 4 ) 3 @Carbon (NTP@C) nanoparticles as a cathode material, the Mg metal as an anode and the Mg(TFSI) 2 + NaBH 4 - triglyme/1,2-Dimethoxyethane (DME) as a hybrid electrolyte. For the first time, the Mg(TFSI) 2 is applied as a Mg 2+ ions source in the chlorine-free Na-Mg hybrid electrolyte with NaBH 4 as both Na + ions source and moisture scavenger. The NTP@C/Mg hybrid battery shows excellent electrochemical performance. The corresponding average capacity decay after 1000 cycles is only 0.004% and 0.008% per cycle at 2 C and 10 C, respectively. Even at 20 C, about 60 mAh g −1 can be obtained after 26000 cycles. The impressive capacity retention of 93.7% and 90.2% can be obtained at 5 and 10 C, respectively. The excellent electrochemical performance of the hybrid battery confirms the feasibility using Mg(TFSI) 2 in the chlorine-free hybrid electrolyte for long term cycle. The developed NTP@C/Mg hybrid battery possesses the advantages of excellent electrochemical performances, good safety and low cost, making it promising for the commercial applications, especially for the large-scale energy storages.
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RSC Advances
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2019
·Vol. 9
·期 24
·13476-13485
·
IF 3.049
Fan Zhang,Chuting Yang,Yi Li,Min Chen,Sheng Hu,Haiming Cheng
P,P-bis (2-oxooxazolidin-3-yl)-N-(3-(triethoxysilyl)propyl)phosphinic amide (APTES-BOP)-modified SBA-15 (SBA-15-BOP) was prepared by a post-synthesis grafting method for the removal of anionic azo dyes from aqueous solutions. The properties of the prepared adsorbent were characterized by PXRD, FT-IR, SEM, TEM, nitrogen sorption, and elemental analysis. Adsorption equilibrium and adsorption kinetic studies demonstrated that the experimental data fitted well with the Langmuir isotherm model and pseudo-second-order model. According to Langmuir fitting, SBA-15-BOP showed high adsorption capacity for CR and RR2 dyes, with the maximum adsorption capacities of 518.1 mg g−1 and 253.8 mg g−1, respectively. The thermodynamic study indicated that the adsorption processes of CR and RR2 dyes on SBA-15-BOP were spontaneous and exothermal. The prepared SBA-15-BOP can be a promising adsorbent for the removal of anionic dyes from aqueous solutions.
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高影响因子
Nanoscale
·
2018
·Vol. 10
·期 47
·22173-22179
·
IF 7.233
Kai Li,Jingwen Ma,Xinglong Guan,Hongwei He,Min Wang,Guoliang Zhang,Fengbao Zhang,Xiaobin Fan,Wenchao Peng,Yang Li
Electrolyzing water as a sustainable energy source is a promising and appealing method to resolve the environmental crisis. Developing efficient and stable bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) is crucial and challenging in the overall water splitting process. Herein, we report the synthesis of Ni(PO3)2–MoO3 nanorods anchored on nickel foam (Ni(PO3)2–MoO3/NF) within a two-step strategy and their application as a bifunctional water splitting electrocatalyst. The results show that the optimal Ni(PO3)2–MoO3/NF electrodes exhibit superior catalytic activity with robust durability and ultralow overpotentials of 86 mV for HER and 234 mV for OER to achieve 10 mA cm−2 (η10) in alkaline solution. The favorable performance of the obtained catalyst is attributed mainly to the synergetic effect between Ni(PO3)2 and MoO3, as well as the self-supporting porous conductive substrate. As a result, the integrated Ni(PO3)2–MoO3/NF electrodes deliver η10 at a small potential of 1.47 V for overall water splitting, highlighting a promising application as a bifunctional electrocatalyst.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Rui Zhang,Wusan Jiang,Zhiwu Liang,Xiao Luo,Qi Yang
The CO2 reaction rate in aqueous 2-methylpiperazine (2MPZ) solution was investigated in terms of the pseudo-first-order rate constant (k0) by using a stopped-flow apparatus with amine concentration ranges of 0.05–0.125 mol/L and the measuring temperature ranges of 293.15–313.15 K. The results show that the CO2 reaction rate in the 2MPZ solution increased as the temperature and the amine concentration increases. The results also demonstrate that the 2MPZ has a faster reaction rate in terms of k0 than 3-dimethylaminopropylamine, 3-diethylaminopropylamine, and monoethanolamine (MEA) but slower than that of PZ at the same amine concentration. The equilibrium solubility as an important absorption parameter for CO2 capture also were measured at 298.15, 313.15, and 333.15 K with CO2 partial pressures of 5–100 kPa, respectively, in 2 M 2MPZ solution. The results show that the CO2 equilibrium solubility of 2MPZ increased as the CO2 partial pressure increased but decreased as the temperature increased. The heat of CO2 absorption in 2 M 2MPZ solution was estimated by using the Gibbs–Helmholtz equation, and the value (−70.9 kJ/mol) is similar to that of PZ but lower than that of MEA. Besides the conclusions stated above, the results of the 13C NMR quantitative investigation suggest that 2MPZ can produce less carbamate and more bicarbonate than PZ at the same CO2 loading.
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危险品化学品经营许可证（带存储）