JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Kui Liang,Hailin Yang,Wenxun Guo,Jianlong Du,Lingyun Tian,Xiaofeng Wen
Silicon has been regarded as a promising alternative anode material for next-generation lithium ion batteries (LIBs) due to its high theoretical specific capacity of 3590 mAh g −1 (Li 3.75 Si formed at room temperature). In this work, nanoscale silicon has been synthesized via a simple and effective metathesis reaction in which SiCl 4 is the silicon source and Zn is the reductant and solvent, at a mild temperature of 500 °C. The preparation process is very simple, facile and low-cost. The as-prepared silicon particles are spherical with a diameter of 150–200 nm, and the delithiation capacity of the nanoscale silicon can reach 1747.7 mAh g −1 at a current density of 0.2 A g −1 .
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ACS Applied Materials & Interfaces
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2017
·
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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DYES AND PIGMENTS
·
2017
·
IF 3.473
Yan Wang,Ziwei Liu,Xiaoyu Lu,Guanhong Lu,Jing Sun
A facile and rapid method is reported to effectively in synthesizing high performance graphene based mica-titania antistatic pearlescent pigment. Znic powder is firstly introduced to prepare the composite pearlescent pigment as a reduction catalyst. Through a comparative analysis with previous Argon annealing reduction method, it can obviously increase 100–4600 fold antistatic performance of mica-titania pearlescent pigment at room temperature in a short time. The minimum volume resistivity of as-prepared composite pigments is 12 kΩ cm and decreases about 10 4 times than that without graphene. The composite pearlescent pigment samples also remain the silver white pearlescent effect, as well as that of raw mica-titania pigment. The stability of titanium chemical state and reduced graphene oxide have been proved by Raman and X-ray photoelectron spectroscopy tests. Since the method is efficient, relatively environmental friendly and low cost, it could be expected to satisfy a large-area application of antistatic pearlescent pigment.
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ANALYTICAL CHEMISTRY
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2017
·
IF 6.32
Jinye Niu,Jilin Fan,Xu Wang,Yongsheng Xiao,Xilei Xie,Xiaoyun Jiao,Chuanzhi Sun,Bo Tang
Biological sensors with simultaneous turn-on signals of fluorescence (FL) and chemiluminescence (CL) triggered by one single species are supposed to integrate spatiotemporally resolved FL imaging with dynamic CL sensing into one luminescent assay. Efficiently increased accuracy can be expected based on complementary information simultaneously obtained from two independent modes, which is crucial in disease detection and diagnosis. However, very few examples can be found to date because of the key challenges in the rational design of sensing structures. Herein, aggregation-induced emission (AIE) was employed to develop a novel organic platform TPE-CLA with simultaneous turn-on FL/CL signals specifically modulated by O2•– in cells, which can be attributed to the activation of AIE resulted from the decreasing solubility after recognition. Using imidazopyrazinone (CLA) as the reactive motif and tetraphenylethene (TPE) as FL/CL enhancing skeleton, TPE-CLA is sensitive enough to image native O2•– in Raw264.7 cells and lipopolysaccharide stimulated O2•– in mice. Endogenous O2•– in HL-7702 cells induced by acetaminophen (APAP) was uninterruptedly monitored for 7200 s with CL and the results were further confirmed by FL imaging. Accordingly, TPE-CLA turns out to be a reliable candidate for real-time and continuous monitoring of endogenous O2•– in live cells. The strategy utilizing AIE to accomplish the FL/CL dual detection is expected to extend the application of AIE as reaction-activated biosensors.
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BIOSENSORS & BIOELECTRONICS
·
2016
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IF 7.476
Xianfeng Hou,Fang Zeng,Shuizhu Wu
γ-Glutamyl transpeptidase (GGT) plays crucial roles in some physiological processes . Herein a turn-on fluorescent probe for γ-glutamyl transpeptidase (GGT) assay based on aggregation-induced-emission (AIE) effect and the enzyme-induced transformation of hydrophilicity to hydrophobicity has been developed by functionalizing tetraphenylethylene (TPE) derivative with two γ-glutamyl amide groups, which simultaneously work as recognition units and hydrophilic groups. When the γ-glutamyl amide groups are cleaved through GGT enzymatic reaction , the hydrophobic reaction product readily aggregate and correspondingly strong blue fluorescence can be observed, as a result of activated AIE process. By virtue of the probe's good solubility in totally aqueous solution, high sensitivity and excellent photostability, the probe can be employed to detect GGT level in human serum samples. Furthermore, the probe can be used for imaging endogenous GGT in living A2780 cells. Hence, the probe holds great promise for acting as a convenient one-step straightforward assay for GGT detection in diagnostic-related applications, and also it could provide a useful approach for conducting pathological analysis for diseases involving GGT.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 42
·10105-10110
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IF 5.066
Shuailing Huang,Yinglong Wu,Fang Zeng,Lihe Sun,Shuizhu Wu
Exposure to odorless, colorless, tasteless and yet lethal nerve gases could lead to paralysis of the central nervous system, organ failure or even rapid death. Hence it is of great importance to develop a convenient, portable and rapid detection method for these gaseous nerve agents. Herein, based on the aggregation-induced emission (AIE) characteristics, a ratiometric fluorescent test-strip sensor (DPA-TPE-Py) for rapid, sensitive and selective detection of the gaseous nerve agent simulant diethyl chlorophosphate (DCP) has been developed. It is easy to prepare handy and portable solid test strips via direct deposition of AIE probes onto the filter paper. Moreover, when the test strips are exposed to DCP vapor, their fluorescence changes from yellow to orange red. The detection limit for DCP is as low as 1.82 ppb, lower than the reported Immediately Dangerous to Life or Health concentration (IDLH concentration). Such a strategy could provide helpful insights into designing convenient cost-effective ratiometric fluorescent sensors in the solid state as well as affording a portative method for detection of gaseous nerve agents.
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MICROCHIMICA ACTA
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2017
·Vol. 184
·期 12
·4731-4740
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IF 4.58
Lu Zhiwei,Zhang Junjun,Dai Wanlin,Lin Xueni,Ye Jiaping,Ye Jianshan
The authors report on a disposable sensor for the differential pulse anodic stripping voltammetric (DPASV) determination of the ions Zn(II), Pb(II) and Cu(II). Simultaneous detection is accomplished by using a screen-printed carbon electrode (SPCE) co-modified with an in-situ plated bismuth (Bi)) film and gold nanoparticles (AuNPs). The synergistic effect of the Bi film, and the large surface and good electrical conductivity of the AuNPs strongly assist in the co-deposition of the three ions. Four well-defined and fully separated anodic stripping peaks, at 540 mV for Zn(II), 50 mV for Pb(II), 140 mV for Bi(III) and 295 mV for Cu(II), all vs. Ag/AgCl, can be seen. The modified SPCE was characterized by scanning electron microscopy, X-ray diffraction, cyclic voltammetry and electrochemical impedance spectroscopy. Under the optimized conditions, the sensor has a good response to these ions. The detection limits (at an S/N ratio of 3) are 50 ng·L −1 for Zn(II), 20 ng·L −1 for Pb(II), and 30 ng·L −1 for Cu(II). The method was applied to the determination of the 3 ions in spiked lake water samples.
Schematic of screen-printed carbon electrode (SPCE) co-modified with a bismuth film and gold nanoparticles for electrochemical simultaneous determination of Zn(II), Pb(II) and Cu(II) by differential pulse anodic stripping voltammetric (DPASV).
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SYNTHESIS-STUTTGART
·
2017
·Vol. 49
·期 08
·1867-1873
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IF 2.65
Jun Gu,Canbin Qiu,Wenbin Lu,Qun Qian,Kunhua Lin,Hegui Gong
The use of pyridine as the sole ligand for the reductive vinylation of unactivated secondary alkyl halides under Ni-catalyzed conditions has been developed. Both alkyl- and aryl-substituted vinyl bromides are suitable, in which alkyl-decorated α-alkenyl bromides resulted in the α-products in good results.
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Polymer Chemistry
·
2016
·Vol. 7
·期 33
·5273-5280
·
IF 5.687
Qingkai Qi,Yue Li,Xiaoyu Yan,Fengli Zhang,Shan Jiang,Jing Su,Bin Xu,Xueqi Fu,Liankun Sun,Wenjing Tian
A novel amphiphilic copolymer consisting of tetraphenylethylene-oxazolidine (TPE-OX) as a pH-sensitive chromophore and poly(ethylene glycol) methyl ether methacrylate (PEGMA) as a water-soluble chain has been well designed and synthesized. A self-assembled polymeric micelle based on the copolymer exhibited clear dual-emission switching between cyan and red with a decrease of pH value in Tris-HCl buffer solution due to the extended conjugation and emerging intramolecular charge transfer effect when opening the spiro-ring of OX moiety. Fluorescence imaging of HepG2 cells stained by the polymeric micelle shows switched luminescence from cyan to red with high selectivity and contrast, indicating that the polymeric micelle was an effective probe for intracellular pH detection. Additionally, the red emission of the polymeric micelle in lysosomes can reversibly switch back to the original cyan emission in response to the two lysosomal activity inhibitors chloroquine and bafilomycin, which demonstrates that the polymeric micelle has potential applications in detecting the activity of lysosomal and further autophagy in cancer cells.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Tian Lan,Yue Chang,Jiaran Song,Lingxin Meng,Pengyun Zhao,Jinxuan Lei,Jingmei Xu
In this paper, amino monomer (4Am-PH) and the sulfonated poly (arylene ether ketone sulfone) involving amino groups (Am-SPAEKS) were successfully prepared by diazotization reaction and direct polycondensation, respectively. The polyethyleneimine-modified UiO-66-NH 2 (P-MOFs) were prepared as fillers. Composite membranes were fabricated by incorporating different contents of P-MOFs into Am-SPAEKS polymer matrix using non-solvent-induced phase separation. The morphology, chemical structure and properties of the polymers, fillers and composite membranes were proved by FT-IR, 1 H NMR, FE-SEM, XPS and etc. The final experimental results showed that the introduction of hydrophilic fillers, P-MOFs, substantially improved the hydrophilicity, water flux and antifouling capabilities of the membranes. The water contact angle decreased from 78.5° to 56.4°. The flux of water from a pure membrane was 333.68 L/m 2 h. When the content of P-MOFs was 0.1 %, the water flux could attain to 830.23 L/m 2 h, the retention rate of bovine serum albumin (BSA) solution could attain to 98.6 % and the flux recovery rate (FRR) values of the composite membrane remained high (86.1 %) for BSA solution. In addition, after three cycles, the pure water flux of the composite membrane could still attain 595.49 L/m 2 h. The results demonstrated that P-MOFs have significant potential for utilization in the preparation of composite ultrafiltration membranes and provided an effective idea for the modification and design of other hydrophilic MOFs applied in the study area of ultrafiltration membranes.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Chunyan Sun,Rui Sun,Yuqing Chen,Yun Tong,Jiawei Zhu,Hong Bai,Shuyu Zhang,Hongru Zheng,Haiqing Ye
A fluorescent assay for Hg 2+ was developed based on magnetic separation and the formation of T-Hg 2+ -T base pairs. The aptamers were immobilized on the surfaces of magnetic beads to form aptamers-functionalized magnetic beads (AMB). In the absence of Hg 2+ , the signal transduction probe (STP) can combine with AMB through complementary base pairing. There is almost no STP in the detection solution after magnetic separation, which results in the fluorescence signal quite weak. The presence of Hg 2+ leads to the formation of T-Hg 2+ -T base pairs between aptamers and help DNA. After magnetic separation, Hg 2+ is separated from the system and STP is left in the solution, so the fluorescence signal was significantly enhanced. The fluorescence intensity linearly increased with the increasing of Hg 2+ concentration from 2 to 160 nM with the detection limit of 0.2 nM. This method has been successfully applied to test and quantify Hg 2+ in river water and ribbon fish with satisfactory recoveries, and the results were in full agreement with those from the atomic fluorescence spectroscopy (AFS). As-built method could avoid the direct binding of Hg 2+ with the fluorescent signal probe. Therefore, combining with magnetic separation, the heavy metal-fluorescence quenching effects could be effectively eliminated.
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Biomaterials Science
·
2017
·Vol. 5
·期 4
·792-799
·
IF 4.21
Yi Hu,Leilei Shi,Yue Su,Chuan Zhang,Xin Jin,Xinyuan Zhu
Fluorescent light-up probes with aggregation-induced emission (AIE) characteristics have been focused on recently. In this report, a new fluorescent probe, namely, DEVD-TPE, which consisted of the substrate peptide Asp-Glu-Val-Asp (DEVD) and the AIE reporter group tetraphenylethene (TPE), was developed for detecting caspase-3 in living cells. In a slightly alkaline solution, the DEVD-TPE probe displayed almost no fluorescence owing to the dynamic rotation of the phenyl rings in solution. However, DEVD-TPE exhibited significant fluorescence when it was cleaved by caspase-3, as well as when the reporter group TPE underwent aggregation. The epidermal growth factor receptor (EGFR) inhibitor gefitinib was used for determining the screening efficacy of the probe for different non-small cell lung carcinoma (NSCLC) cell lines, namely, HCC827, A549 and H1650 cells. Cell proliferation and apoptosis assays indicated that the three cell lines had different sensitivities to gefitinib. The results of analysis by living-cell fluorescence imaging and flow cytometry were consistent with those of the cell proliferation and apoptosis assays. This demonstrated that our probe could detect caspase-3 in living cells, which confirmed the apoptosis of NSCLC cells. Furthermore, our probe indicated that gefitinib was more efficient against HCC827 cells than against the other two NSCLC cell lines. This report proves that the fluorescent probe DEVD-TPE is highly sensitive to caspase-3 and has potential prospects in the rapid screening of NSCLC.
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