PROCESS BIOCHEMISTRY
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2015
·
IF 2.516
Jiefeng Xiao,Zhibao Huo,Dezhang Ren,Song Zhang,Jiang Luo,Guodong Yao,Fangming Jin
A novel and efficient process for the production of 1,2-propylene glycol with high productivity and high selectivity from biomass-derived lactic acid over CuO was investigated. As a result, CuO exhibited a high catalytic activity while Zn acted as a reductant for the conversion of lactic acid to 1,2-propylene glycol. Among the various reaction parameters, such as catalysts, reductants, temperature, water filling and reaction time we investigated, a 93% yield of 1,2-propylene glycol in the presence of 0.83 mmol lactic acid, 5 mmol CuO and 30 mmol Zn with 35% water filling at 250 °C for 2 h was achieved. In addition, a carbon balance at optimum reaction conditions by TOC indicated that approximately 99% lactic acid was converted into liquid products in the transformation. In situ formed hydrogen by the oxidation of Zn in water is effective for the transformation compared to added gases hydrogen. The proposed mechanism for the conversion of lactic acid to 1,2-propylene glycol over CuO is also discussed.
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ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Wei Zhang,Wei Liu,Ping Li,Fang Huang,Hui Wang,Bo Tang
Hydrogen peroxide (H2O2) as a reactive oxygen species (ROS) plays a crucial role in oxidative stress and signal transduction of organisms. Currently, a fluorescence probe has proven to be a powerful tool for the H2O2 analysis. However, the common problem is the slow response, causing difficulty in tracking H2O2 in situ. Herein, we describe a novel aggregation-induced emission (AIE) fluorescence probe based on increased polarity of C–B bonds that is well suited for monitoring H2O2 rapidly and selectively. Importantly, the probe was successfully applied to visualize H2O2 levels in living cells, which provides a rapid-response and highly selective fluorescence tool for monitoring of the H2O2 levels in biological process.
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PubMed
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
·
IF 3.205
Jun Fu,Naimeng Jiang,Dezhang Ren,Zhiyuan Song,Lu Li,Zhibao Huo
A novel process for the conversion of ethylene carbonate (EC) to ethylene glycol (EG) in high temperature water was investigated. As a result, even there is no external catalyst and additive, the reaction of EC proceeded well and provided the desired EG in 99% yield with 25% water filling at 250 °C for 2 h. Moreover, only CO 2 as by-product was observed in the process. High temperature water exhibits an unique merits and plays an catalytic role for EC conversion. From viewpoint of practice, this work provides a simple, environmentally benign, catalyst/additive-free process for the production of ethylene glycol from ethylene carbonate.
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SOLAR ENERGY
·
2016
·
IF 3.685
Xiaodong Ren,Wenping Dang,Qiang Ma,Xuejie Zhu,Wei Zi,Lujian Jia,Bin Liu,Xisheng Zhang,Fengwei Xiao,Heqing Yang,Zhou Yang,Shengzhong (Frank) Liu
Superior texture-controlled ZnO thin film is prepared using a low cost electrochemical deposition process at open atmospheric condition. FE-SEM shows that the surface morphology can be altered from nanorods to microplates by adding a chemical additive. XRD analysis confirms that the crystalline growth direction and texture can be controlled by changing the additive concentration during the deposition. Using the optimized ZnO based back reflector (BR) in single junction a-SiGe:H solar cell device, we have achieved external quantum efficiency (EQE) as high as 87% at ∼550 nm; the EQE corrected short circuit current density ( J SC ) was 20.63 mA cm −2 and solar cell efficiency was 7.73% for the single junction a-SiGe:H solar cell. It proves to us that the high quality ZnO thin films can be produced at much reduced cost using electrochemical deposition for solar cell and other optoelectronic applications.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 3
·362-367
·
IF 1.119
Cao Li,Jia Chunman,Zhang Qi,Chen Da,Zhang Chunyan,Qian Yaao
A fluorescent probe with a coumarin moiety bound to rhodamine 6G hydrazide( 1 ) was synthesized. Its sensing behavior toward various metal ions was investigated with fluorescence methods. Compound 1 displays different fluorescence emission responses to Al 3+ and Ca 2+ at the same excitation wavelength in the visible light region, while no changes occur after the addition of other metal ions. The binding ratios of the complexs of 1 -Al 3+ and 1 -Ca 2+ are both 2:1 according to the Job plot and high resolution mass spectrometer(HRMS) experiments. Moreover, emission spectrum of 1 -Ca 2+ complex and absorption spectrum of the rhodamine dyes overlap largely. When Al 3+ was added to the 1 -Ca 2+ system, calcium in complex 1 -Ca 2+ can be displaced by Al 3+ , resulting in the output of another ratiometric sensing signal, which demonstrates that the 1 -Ca 2+ complex can be served as a new and effective fluorescence resonance energy transfer(FRET) donor for rhodamine derivatives.
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ACS Applied Materials & Interfaces
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2017
·
IF 7.504
Yanchun Yang,Lijian Huang,Daocheng Pan
In our recent report (ACS Appl. Mater. Interfaces2016, 8, 5308), Li+ ions had been successfully incorporated into the lattice of the selenized Cu2ZnSn(S,Se)4 thin film on a quartz substrate by substituting equivalent Cu+ ions, and Li+ ions was also found to have the little effect on the crystal growth and defect passivation. To further improve the cell performance of Li-doped CZTSSe devices, we conducted the same experiments on the sodium-rich soda-lime glass (SLG) substrate in this study, instead of sodium-free quartz substrate. Surprisingly, only trace amounts of Li (Li/Cu molar ratio ∼1 × 10–4) were detected in the final CZTSSe thin films; meanwhile, a large amount of sodium was present on the surface and at the grain boundaries of the selenized thin films. A Li/Na exchange mechanism is used to explain this phenomenon. Only on the sodium-free substrate can Li+ ions enter the CZTSSe host lattice, and doping Li+ ions on the SLG substrate are nearly identical to doping Na+ ions.
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Journal of Energy Chemistry
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2016
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IF 2.322
Lu Li,Dezhang Ren,Jun Fu,Yunjie Liu,Fangming Jin,Zhibao Huo
An efficient process for the conversion of dimethyl oxalateinto ethylene glycol with high selectivity and high yield over Cu 2 O was investigated. In situ formed Cu as a true catalytically active species showed a good catalytic performance for DMO conversion to produce EG in 95% yield.
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MATERIALS & DESIGN
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2016
·
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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RSC Advances
·
2017
·Vol. 7
·期 65
·41127-41135
·
IF 3.108
Weili Li,Wei Yao,Jun Wang,Zhenyu Qiu,Jijun Tang,Shengyuan Yang,Meifang Zhu,Zexiao Xu,Rong Hu,Anjun Qin,Ben Zhong Tang
For polymer materials, both their compositions and preparation process greatly influence their service performance. Thus, the sound understanding of the relationship between materials' preparation processes and their properties is paramount. However, current research methods are partially limited due to the absence of a direct testing method to track the entire process, e.g. synthesizing, curing, ageing, and so on. With the ability for real-time sensitive characterization, fluorescence spectroscopy may be applied in testing polymer materials' performance. Here, we synthesized a novel aggregation induced emission (AIE) resin named TPE–EPOXY resin and prepared an AIE coating based on it. According to restriction of intramolecular rotation (RIR) mechanism, the preparation, curing, and aging processes for the AIE polymer resins & coatings could be studied with real-time observation. In addition, their properties could also be studied systematically. The results in this paper pave a good way to understand the relationship between the internal structure and the properties of polymer materials. Moreover, the prepared AIE polymer resins has a potential to expand the application fields of the AIE mechanism.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2017
·Vol. 409
·期 24
·5757-5765
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IF 3.431
Kong Rong-Mei,Zhang Xiaobin,Ding Lu,Yang Daoshan,Qu Fengli
Fluorescent light-up probes based on aggregation-induced emission (AIE)-active molecules have recently attracted great research interest due to the intelligent fluorescence activation mechanism and high sensitivity. In this work, an AIE-silica nanosphere (SiO 2 NP)-based label-free fluorescent aptasensor for the sensitive “turn-on” detection of prostate-specific antigen (PSA) is reported for the first time. The positively charged amino-functionalized SiO 2 NPs were used as efficient nanocapturer to electrostatically adsorb single-stranded PSA aptamer (PA) to form SiO 2 NP-PA nanocomposite as well as adsorb negatively charged tetraphenylethylene derivative 3 (TPE3) to form AIE-SiO 2 NP nanocomposite. The binding of the aptamer to the target PSA could induce a rigid aptamer conformation, resulting in the release of the PA away from the surface of SiO 2 NPs. This made the AIE molecules TPE3 aggregate on the SiO 2 NP surface and emit high fluorescence. With the advantages of simple design and rapid responses, the proposed aptasensor showed high sensitivity and selectivity for PSA with a detection limit of 0.5 ng/mL. The aptasensor was further applied in human serum samples with satisfactory results. Given its versatility, high selectivity, and sensitivity, the proposed method could be extended to other targets by varying the recognition probes.
An AIE-SiO 2 NP-based label-free fluorescent aptasensor for the sensitive “turn-on” detection of PSA is reported for the first time
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MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
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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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2016
·
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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