JOURNAL OF ASIA-PACIFIC ENTOMOLOGY
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2017
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IF 1.046
Yunhua Zhang,Jinyun Ji,Xiao Zhao,Ruoheng Jin,Jianhong Li,Hu Wan
A previous study demonstrated that a β- N -acetyl- d -hexosaminidase ( NlHex4 ) from the brown planthopper could serve as a new potential target for biopesticides due to its requirement for molting, and lethal phenotypes were observed via RNA interference . However, the enzymatic properties of NlHex4 remain unclear. In the present study, NlHex4 was expressed, purified and characterized. Recombinant NlHex4 was functionally expressed in baculovirus-infected insect cells and purified with a molecular weight of approximately 70 kDa. Recombinant NlHex4 had an optimal pH and temperature of 6.0 and 60 °C, respectively. Moreover, recombinant NlHex4 exhibited thermal stability at 50 °C for at least 1 h. Furthermore, the activity of recombinant NlHex4 was inhibited by the metal ions Fe 2 + and Fe 3 + and the serine protease inhibitor phenylmethanesulfonyl fluoride. These results reveal the enzymatic properties of NlHex4 and provide a basis for future investigation of the interaction between HEX and chitin oligosaccharide .
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MATERIALS & DESIGN
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2016
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IF 3.997
Xinjian Cheng,Yun Yu,Yiru Jia,Lian Duan
Three small molecular boron dipyrromethene (BODIPY) derivatives (B3a, B3b and B3c) were well-designed and synthesized at first, and then were incorporated into polyurethane to obtain macromolecular fluorescent sensors. These small molecular BODIPY derivatives exhibited high sensitivity and selectivity to Hg 2 + , Cr 3 + and Fe 3 + ions. The colors of these chemicals changed rapidly upon the addition of Hg 2 + , Cr 3 + and Fe 3 + ions. In addition, their fluorescence peaks shifted and was enhanced as well. B3a, B3b and B3c still remained the sensing properties when being introduced to polyurethane (PU). The functionalized PU films not only showed color change and fluorescence shift for detecting Hg 2 + , Cr 3 + and Fe 3 + ions as their small molecular counterparts, but also triggered a new emission peak in 500–600 nm. Besides, the functionalized PU film (PU-B3a as a sample) could absorb Hg 2 + ions more than 84 mg/g in unit time and volume. It suggested that as long as the structure of the small molecular sensor was remained, the fluorescent ability remained even it is introduced to the macromolecular chains. In addition, Glass transition temperature (T g ) of the PU films changed when B3a, B3b and B3c were introduced.
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MATERIALS CHEMISTRY AND PHYSICS
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2017
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IF 2.084
Yiru Jia,Yi Pan,Haiying Wang,Rong Chen,Hua Wang,Xinjian Cheng
A fluorescent monomer of boron dipyrromethene (BODIPY) derivative ( 9AnPD) is designed and synthesized at first, and then it is introduced into polyurethane to obtain polymeric chemosensor with dangling fluorescent side groups. The monomer chemosensor 9AnPD exhibits highly selective properties to Hg 2+ ion in a wide pH range. The color of the monomer changed rapidly upon the addition of Hg 2+ ion. The fluorescence peak shifted and is enhanced about 4-flod. In addition, the monomer chemosensor reaches the detection limit of Hg 2+ is as low as 5 × 10 −6 m. When the fluorescent monomer is introduced to polymers, the sensing properties of the monomer chemosensor 9AnPD still remained. The polymer chemosensors not only exhibit fluorescence shift and color change for identifying Hg 2+ ion as its monomer chemosensor, but also improve the efficiency of detection. The detection limit of polymer chemosensor could reach 5 × 10 −7 m , and the fluorescence enhanced about 6-flod. The glass transition temperature (T g ) of the fluorescent PU is increased with the introduction of 9AnPD . However, it is about 60 °C, and will not lead to any adverse effect for the process. The molecular weights of PUs are lower than which without 9AnPD , but still of the macromolecular level.
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DALTON TRANSACTIONS
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2016
·Vol. 45
·期 18
·7728-7736
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IF 4.177
Erbin Shi,Xiaoqin Zou,Jia Liu,Huiming Lin,Feng Zhang,Shaoxuan Shi,Fenghua Liu,Guangshan Zhu,Fengyu Qu
A facile electrochemical plating strategy has been employed to prepare the electroactive metal–organic framework film (NENU-3) onto a copper electrode in the acid electrolyte containing 1,3,5-benzenetricarboxylic acid (H3BTC) and phosphotungstic acid (PTA). The as-made NENU-3 films have been characterized using powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analyses (TGA). These analyses indicate that NENU-3 films have high phase purity and high stability. Further, different electrochemical techniques are utilized for measuring the electrochemical behaviors of the NENU-3 film electrodes. Accordingly, the kinetic parameters of a NENU-3 film electrode towards the electrocatalytic reduction of bromate are obtained, including the electron transfer coefficient (α), the catalytic rate constant (ks), and the diffusion coefficient (D). The film electrodes present excellent electrocatalytic ability for the bromate reduction, and can be used successfully for the amperometric detection of bromate. Under the optimized conditions, the proposed sensor exhibits a wide linear range (0.05–72.74 mM) and a lower detection limit (12 μM) measured by chronoamperometry (CA). Moreover, the films possess high electrochemical stability and strong anti-interference capability in the bromate detection process. It has been demonstrated that the electrochemical plating method reported here offers a reliable and efficient way to fabricate MOF films on conductive substrates for bromate detection.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Qing Tan,Wei Sun,Zhiliang Li,Jing-Feng Li
Ternary copper tin sulfide (Cu–Sn–S) compounds have been investigated for decades as promising candidates of earth-abundant thin film solar cell absorbers. Cu 2 SnS 3 is a representative member of this material system, and is highly expected to be a potential thermoelectric material by the first-principles calculations. In this work, Cu 2 SnS 3 bulk materials were synthesized by the mechanical alloying (MA) combined with spark plasma sintering (SPS), and their crystal structures, electronic transport properties and enhanced thermoelectric performance were systematically investigated. We found that pristine Cu 2 SnS 3 is a p-type thermoelectric material with a relatively high thermopower up to 300 μV/K and low thermal conductivity below 1.0 W/m K above 700 K. It revealed that In doping is an effective means to improve the electrical transport properties, which leads to a figure of merit ( ZT ) of Cu 2 Sn 0.9 In 0.1 S 3 close to 0.6 at the relatively low temperature (773 K).
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LANGMUIR
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2016
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IF 3.993
Defeng Li,Ang Wu,Guangyin Xu,Hua Lai,Zhongjun Cheng,Yuyan Liu
In this paper, we report a simple method based on assembling n-alkanoic acids on hierarchical structured copper toward preparing surfaces with tunable oil wetting performance in water. Surface wettability from superoleophobicity to superoleophilicity in water can be regulated through tuning the chain length of n-alkanoic acids. Importantly, even in strongly acid and basic water, such phenomena can still be observed. The cooperation between the hierarchical structures and the surface chemical composition variation is responsible for the controllability. Meanwhile, the tunable ability is universal and the controllability is suitable for various oils including silicon oil, n-hexane, and chloroform. Moreover, the method was also used on copper mesh substrates, and we reported the related application of selective oil/water separation. This paper provides a flexible strategy toward preparing surfaces with tunable oil wetting performances, which can also be suitable for other materials, and offers some fresh ideas in manipulating underwater oil wetting performances on surfaces.
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MATERIALS & DESIGN
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2016
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IF 3.997
Tianqi Hu,Hongtao Chen,Mingyu Li
This paper presents a novel die attach material that withstands high working temperatures of up to 676 °C after < 40 min of reflow at 250 °C. The die attach material was preform compressed with Cu@Sn core-shell structured microparticles . When the reflow temperature reached 232 °C, the outer Sn layer melted and connected the inner Cu cores. After reflow soldering at 250 °C for 8 min, the outer Sn completely transformed into network-like Cu-Sn intermetallic compounds (IMCs), which have a higher remelting temperature than Sn (415 °C for Cu 6 Sn 5 and 676 °C for Cu 3 Sn). Consequently, the inner Cu cores were interconnected by the formed network-like Cu-Sn IMCs with a high remelting temperature of at least 415 °C. If the sample was reflowed at 250 °C for 40 min, the outer Cu 6 Sn 5 layer completely transformed into Cu 3 Sn, and the resulting bondline could sustain a higher temperature. The shear strengths of the resulting bondlines after reflow soldering at 250 °C for 8 and 40 min were 29.35 and 18.78 MPa at 400 and 500 °C, respectively.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2016
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IF 4.732
Jing Guo,Wen-Hui Zhou,Ying-Li Pei,Qing-Wen Tian,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Si-Xin Wu
CZTSSe based thin film solar cells have received considerable interests due to low material cost, suitable band gaps and high absorption coefficient of CZTSSe materials. Achieving high efficiency CZTSSe based thin film solar cells often need a high temperature selenization process that always causes Sn loss in the form of gaseous SnSe 2 . Additional Sn complement may decrease the loss of Sn during selenization process and improve the performance of fabricated CZTSSe based thin film solar cells. Here, we investigate the effect of additional Sn complement on the performance of CZTSSe based thin film solar cells fabricated from pure element solution. XRD and Raman characterizations indicate that additional Sn complement could reduce the secondary phase that may cause the voltage loss and decrease of efficiency. The solar cell fabricated with 15% additional Sn complement shows the best conversion efficiency of 8.71% (V OC =0.42 V, J SC =32.73 mA cm −2 , FF=63.19%). To the best of our knowledge, it is the highest efficiency of CZTSSe based thin film solar cells fabricated from pure element solution.
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ACS Applied Materials & Interfaces
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2017
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IF 7.504
Yafang Qi,Qingwen Tian,Yuena Meng,Dongxing Kou,Zhengji Zhou,Wenhui Zhou,Sixin Wu
The partial substitution of Cu+ with Ag+ into the host lattice of Cu2ZnSn(S,Se)4 thin films can reduce the open-circuit voltage deficit (Voc,deficit) of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. In this paper, elemental Cu, Ag, Zn, Sn, S, and Se powders were dissolved in solvent mixture of 1,2-ethanedithiol (edtH2) and 1,2-ethylenediamine (en) and used for the formation of (Cu1–xAgx)2ZnSn(S,Se)4 (CAZTSSe) thin films with different Ag/(Ag + Cu) ratios. The key feature of this approach is that the impurity atoms can be absolutely excluded. Further results indicate that the variations of grain size, band gap, and depletion width of the CAZTSSe layer are generally determined by Ag substitution content. Benefiting from the Voc enhancement (∼50 mV), the power conversion efficiency is successfully increased from 7.39% (x = 0) to 10.36% (x = 3%), which is the highest efficiency of Ag substituted devices so far.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Guangjian Zeng,Meiying Liu,Kexin Shi,Chunning Heng,Liucheng Mao,Qing Wan,Hongye Huang,Fengjie Deng,Xiaoyong Zhang,Yen Wei
Surface modification of nanodiamond (ND) with poly(2-methacryloyloxyethyl phosphorylcholine) [poly(MPC)] has been achieved by using metal free surface initiated atom transfer radical polymerization (SI-ATRP). The ATRP initiator was first immobilized on the surface of ND through direct esterification reaction between hydroxyl group of ND and 2-bromoisobutyryl bromide. The initiator could be employed to obtain ND-poly(MPC) nanocomposites through SI-ATRP using an organic catalyst. The final functional materials were characterized by 1 H nuclear magnetic resonance, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and thermo gravimetric analysis in detailed. All of these characterization results demonstrated that ND-poly(MPC) have been successfully obtained via metal free photo-initiated SI-ATRP. The ND-poly(MPC) nanocomposites shown enhanced dispersibility in various solvents as well as excellent biocompatibility. As compared with traditional ATRP, the metal free ATRP is rather simple and effective. More importantly, this preparation method avoided the negative influence of metal catalysts. Therefore, the method described in this work should be a promising strategy for fabrication of polymeric nanocomposites with great potential for different applications especially in biomedical fields.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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IF 3.958
Peng Zhou,Jing Zhang,Yongli Zhang,Juan Liang,Ya Liu,Bei Liu,Wei Zhang
Activation of hydrogen peroxide (H 2 O 2 ) and its mechanism were investigated during corrosion of nanoscale zero valent copper (nZVC) in acidic aqueous solution. As the radical probe compound, benzoic acid (BA) degradation was completely achieved after 25 min in the nZVC/H 2 O 2 system at initial pH 3.0. H 2 O 2 can accelerate the corrosion of nZVC to release Cu + resulting in the further activation of H 2 O 2 via a Fenton-like reaction in acidic aqueous solution. The released Cu + during the corrosion of nZVC is the main effective copper species to activate H 2 O 2 to produce OH in the nZVC/H 2 O 2 system. Hydroxyl radical ( OH) was verified as the primary reactive oxidant which is responsible for BA degradation in the nZVC/H 2 O 2 system owing to the intense inhibition of BA degradation with the addition of excess tert -butyl alcohol (TBA). Moreover, acidic aqueous solution facilitates the degradation of BA and optimum initial pH for BA degradation is 3.0. Higher nZVC dosage could enhance the degradation rate of BA. In addition, the present study put forward an interesting idea to make full use of intermediate Cu + to activate H 2 O 2 during corrosion of nZVC to degrade organic contaminants.
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ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Jiao Wang,Yue Wang,Qiang Liu,Linnan Yang,Rongrong Zhu,Chengzhong Yu,Shilong Wang
Breast cancer is the primary reason for cancer-related death in women worldwide and the development of new formulations to treat breast cancer patients is crucial. Curcumin (Cur), a natural product, exerts promising anticancer activities against various cancer types. However, its therapeutic efficacy is hindered as a result of poor water solubility, instability, and low bioavailability. The aim of this work is to assess the curative effect of a novel nanoformulation, i.e., Cur-loaded and calcium-doped dendritic mesoporous silica nanoparticles modified with folic acid (Cur-Ca@DMSNs-FA) for breast cancer therapy. The results manifested that Cur-Ca@DMSNs-FA dispersed very well in aqueous solution, released Cur with a pH-responsible profile, and targeted efficiently to human breast cancer MCF-7 cells. Further investigations indicated that Cur-Ca@DMSNs-FA effectively inhibited cell proliferation, increased intracellular ROS generation, decreased mitochondrial membrane potential, and enhanced cell cycle retardation at G2/M phase, leading to a higher apoptosis rate in MCF-7 compared to free Cur. Moreover, the Western blotting analysis demonstrated that Cur-Ca@DMSNs-FA were more active than free Cur through suppression of PI3K/AKT/mTOR and Wnt/β-catenin signaling, and activation of the mitochondria-mediated apoptosis pathway. In addition, hemolysis assay showed that the Ca@DMSNs-FA exhibited good biocompatibility. Last, in vivo studies indicated that when Cur was encapsulated in Ca@DMSNs-FA, the Cur concentration in blood serum and tumor tissues was increased after 1 h intraperitoneal injection. In conclusion, Cur-Ca@DMSNs-FA might act as a potential anticancer drug formulation for breast cancer therapy.
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