ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 10
·2539-2546
·
IF 3.431
Wu Di,Qi Wenjing,Liu Chun,Zhang Qing
A “turn-on” fluorescent sensor for ozone using bovine serum albumin-directed gold nanoclusters (BSA-Au NCs) via energy transfer was developed. The spectral overlap of fluorescent spectrum of BSA-Au NCs with absorption spectrum of indigo carmine (IDS) was utilized. Ozone cleaves C = C bond of IDS and suppresses energy transfer from BSA-Au NCs to IDS. Therefore, this proposed fluorescent sensor is a “turn-on” detection motif. It is the first application of fluorescent nanoclusters in sensitively detecting ozone from 0.2 to 12 μM with the limit of detection of 35 nM (the volume of 500 μL, 1.68 ppb). The proposed fluorescent sensor for ozone is more sensitive and faster (within 2 min) than most methods and is with good selectivity for ozone detection against other reactive oxygen species, reactive nitrogen, or metallic ions. Besides, the proposed method is also utlized in ozone detection in ambient air by monitoring 1 h (60 min) in Qijiang district in Chongqing city. The average of concentration of ozone in ambient air ranges from 44.97 to 52.85 μg/m 3 . The results are compared with the automatic monitoring data provided by Qijiang Environmental Monitoring Station and the relative deviations range, respectively, from 2.1 to 5.6%, which suggests that it is a promising fluorescent sensor for ozone in ambient air. This study not only develops a new model of energy transfer motif using BSA-Au NCs as donor and IDS as acceptor but also expands the application of BSA-Au NCs in environmental science.
A “turn-on” fluorescent sensor for ozone detection using bovine serum albumin-directed gold nanoclusters (BSA-Au NCs) via energy transfer is developed. It is the first time to utilize spectral overlap of fluorescent spectrum of BSA-Au NCs with absorption spectrum of indigo carmine and to achieve fast, sensitive, and selective ozone detection with a limit of detection of down to 35 nM (the volume of 500 μL, 1.68 ppb).
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 3
·951-959
·
IF 4.58
Zhang Yuhuan,Wang Yanru,Zhu Wenxin,Wang Jing,Yue Xiaoyue,Liu Wei,Zhang Daohong,Wang Jianlong
The capability of multi-level logic operations in biological diagnosis is far from being fully realized. In particular, the simplification of logic judgments to realize rapid, on-site complex diagnoses is still a key issue in bioelectronics. The authors here describe the construction of a colorimetric multilevel DNA circuit that incorporates two IMPLY gates and a sample extraction technology (SET) with anti-BPA aptamer as a co-recognizing element and the color of gold nanoparticles as the output signal. The circuit can perform multi-bioanalysis of the plasticizers and hormone mimetics bisphenol A (BPA) and bisphenol S (BPS). The assay is based on the finding that the aptamer against BPA can recognize both BPA and BPS. This DNA logic detection system is simple, fast, sensitive and selective because of the utilization of a co-recognition element which decreased input numbers. This, in turn, cascades multiplex Boolean logic gates and simplifies the diagnostic challenge. Both BPA and BPS can be determined by photometry at 620 nm, the limit of detection being 1.5 ng⋅mL −1 for BPA and 1.3 ng⋅mL −1 for BPS. Application to (spiked) water samples shows good analytical performance in terms of recovery (95.4 to 106.8%), linear range (4.4 to 66 ng⋅mL −1 for BPA, 2.5 to 75 ng⋅mL −1 for BPS) and correlation coefficients (>0.98). In our perception, the method represents a simple route for the fabrication of colorimetric multi-level DNA circuits. It may shorten the gap between bioelectronic logic circuits and high throughput real sample analysis.
Illustration of sample extraction treatments (SET) of bisphenol A (BPA) and bisphenol S (BPS) and the three-input IMPLY1-IMPLY2 logic operation with BPA, BPS and anti-BPA aptamer as inputs.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 2
·1-8
·
IF 2.02
Qin Ji-Hua,Liu Zhao-Qing,Li Nan,Chen Yi-Bo,Wang Dong-Yao
The nanofluid as a pivotal role in heat transfer system has attracted more and more attention. Herein, the stearic acid-modified CuS (SA-CuS) nanoparticles with a uniform diameter of 60 nm were synthesized successfully by a facile two-phase approach. Accordingly, the CuS-oil nanofluids, with SA-CuS concentrations ranging from 0.01 to 0.04 vol%, were prepared by a one-step method in the heat transfer oil. These CuS-oil nanofluids exhibit good stability and considerable enhanced thermal conductivity. The improvement is even up to 20.5% with a volume fraction of 0.04 vol% at 30 °C. Furthermore, the effect of volume fraction and temperature on the viscosity of the nanofluids was also systematically investigated.
Graphical Abstract
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 85
·期 1
·76-83
·
IF 1.575
Zhu Chunjie,Zhao Guangying,Dou Wenchao
Abstract In this paper, we aimed to develop a two-step approach for highly efficient synthesis of bright core-shell colored silica submicron particles (core-shell colored SiO 2 SMPs) by coupling organic reactive dyes onto silica submicron particle (SiO 2 SMPs). C.I. Reactive Blue 21 was selected as model dye to synthesize a core-shell blue silica submicron particle (core-shell blue SiO 2 SMPs). 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane (3APTMS) and C.I. Reactive Blue 21 were grafted simultaneously on the surface of particles in the aqueous solution to produce bright blue SiO 2 SMPs. The effect of the amount of 3APTMS and C.I. Reactive Blue 21 on preparation of blue SiO 2 SMPs was studied. To prevent dye on blue SiO 2 SMPs from leaking, core-shell blue SiO 2 SMPs were prepared in a pre-hydrolyzed Stöber system. Scanning Electronic Microscopy (SEM) and Dynamic Light Scattering (DLS) were used to character the SiO 2 SMPs, blue SiO 2 SMPs, and core-shell blue SiO 2 SMPs. The results indicate that the blue SiO 2 SMPs and core-shell blue SiO 2 SMPs synthesized under the optimal conditions with regular morphology and good dispersibility. Coupling efficiency of the C.I. Reactive Blue 21 was as high as 89.2% (the quality of dye coupled was about 70 mg/g SiO 2 ). In the same way, six other different colored SiO 2 SMPs were also prepared by introducing different color organic reactive dyes on SiO 2 SMPs. The bright monodispersed core-shell colored SiO 2 SMPs is promising to be used as sensitive and reproducible maker in immunoassay. Graphical abstract A one-step approach for the high efficiently coupling of reactive dyes onto SiO 2 SMPs in an aqueous solution to synthesize monodispersed colored SiO 2 SMPs was designed. The hydrolysis and condensation of 3APTMS and dye coupling were preceded at the same time. After modification and coloration, a silica protection layer was grown onto the colored SiO 2 SMPs to prevent the dye leakage and to make the colored SiO 2 SMPs be pure silica surface.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 21
·期 12
·3545-3555
·
IF 2.316
Zhai Zuozhao,Wang Shasha,Xu Yuelong,Zhang Lihui,Yan Meifang,Liu Zhenfa
Carbon aerogels (CA) with uniform pore structures were prepared by the polycondensation of phloroglucinol, resorcinol, and formaldehyde, using carboxylated chitosan as a soft template. The CA were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and surface area analysis. When carboxylated chitosan was added, the time for wet gel formation was reduced by 60%, and the CA showed a more uniform pore structures. The electrochemical performance of the CA was measured in a three-electrode electrochemical cell. The CA prepared with added carboxylated chitosan showed lower charge transfer resistance on the electrode surface, and the specific capacitances were also enhanced, showing a specific capacitance as high as 135 F/g at a resorcinol-to-carboxylated chitosan mass ratio of 250:1 at a current density of 0.5 A/g. This specific capacitance is much higher than that of the CA without carboxylated chitosan. The capacitance retention under increasing discharge current density was also enhanced by the addition of carboxylated chitosan. The electrochemical performance of the CA in different electrolytes (1 M LiOH, 1 M NaOH, 1 M KOH, 3 M KOH, 6 M KOH, and 9 M KOH) was investigated. The results show that the electrochemical performance in 6 M KOH was better than those in other electrolytes.
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Food and Bioprocess Technology
·
2017
·Vol. 10
·期 10
·1844-1853
·
IF 2.576
Ye Youxin,Zhu Mingjin,Miao Keyan,Li Xinying,Li Defu,Mu Changdao
Antimicrobial activity is an attractive property for packaging materials which can extend the shelf life of products and provide microbial safety for consumers. The study aimed to analyze the physicochemical and antimicrobial properties of gelatin-based edible films containing trans -anethole as the active additive. Encapsulation with β-cyclodextrin was used as an effective way to introduce trans -anethole into gelatin matrix. The results showed that the trans -anethole/β-cyclodextrin inclusion complex could be evenly dispersed in the gelatin-based edible films with appropriate addition. The incorporation of trans -anethole conferred the edible films with good antimicrobial activity as expected, which increased with the content of trans -anethole increasing. Moreover, the addition of inclusion complex improved the tensile strength and surface hydrophobicity and reduced the moisture content of the edible films. It was interesting that the edible films presented great UV light barrier property and it was increased by the addition of inclusion complex. Overall, the antimicrobial gelatin-based edible films showed great potential as bioactive packaging materials to extend food shelf life.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 313
·期 2
·309-318
·
IF 1.282
Wang Zhipeng,Huang Huang,Ding Songdong,Hu Xiaoyang,Zhang Lirong,Liu Ying,Song Lianjun,Chen Zhili,Li Shimeng
Abstract Two diglycolamide homologs, N,N,N′,N′ -tetraoctyl-3,6-dioxaoctane diamide (DOODA) and N,N,N′,N′ -tetraoctyl-3,6,9-trioxaundecane diamide (TOUDA), were synthesized. Their extraction behaviors of Am 3+ and Eu 3+ were investigated and compared with those of N,N,N′,N′ -tetraoctyl-3-oxapentane diamide (TODGA). The extraction ability toward Am 3+ and Eu 3+ decreased with increasing etheric oxygen number in the extractant structure. In contrast to TODGA, an very interesting inversion on the selectivity occurred for DOODA and TOUDA, which were more favor of extracting Am 3+ than Eu 3+ . The maximum SF
Am/Eu of 3.5 for DOODA can be achieved at 3.0 mol/L HNO 3 . The stoichiometries of extracted species and extraction thermodynamic parameters were also presented. Graphical Abstract
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JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 4
·1-7
·
IF 1.615
Li Hu,Zhou Zhen,Liu Jingcheng,Zheng Xiangfei,Xu Wenjia,Ji Changwei,Shi Weidong,Liu Ren,Liu Xiaoya
Hexakis(4-formylphenoxy) cyclotriphosphazene (HAPCP), substitution reaction product of hexachlorotriphosphazene (HCTP) with p-hydroxybenzaldehyde, was reduced by sodium borohydride to afford hexakis[4-(hydroxymethyl) phenoxyl] cyclotriphosphazene (HHPCP). The hydroxyl group of this compound was then protected by the reaction with di-tert-butyl dicarbonate ester (DBDC) in the presence of 4-dimethylaminopyridine (DMAP) as catalyst to give t-butyloxy carbonyl (tBOC) protected HHPCP. Fourier-transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance ( 1 H NMR) were employed to characterize the chemical structure, indicating that the synthesis was successful. Thermal behavior was characterized by thermogravimetric analysis (TGA), the results showed that the initial thermal decomposition temperature occurred at approximately 170 °C, X-ray diffraction analysis (XRD) results showed that the tBOC protected HHPCP derivatives had amorphous form, and performed excellent film-forming property. Upon irradiation to 365 nm exposure, the photoacid generated proton H + , which can catalyze the deprotection of acid labile tBOC group. This type of novel molecular glass photoresist based on hexachlorotriphosphazene showed high sensitivity, making it possible to fabricate 1 μm line and space pattern under i-line exposure.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2442-2451
·
IF 2.302
Cheng Shuang,Wang Jian,Lin Hongzhen,Li Wanfei,Qiu Yongcai,Zheng Zhaozhao,Zhao Xinluo,Zhang Yuegang
Transition metal chalcogenides such as FeS 2 are promising electrode materials for energy storage. However, poor rate performance and low cycling stability hinder the practical application of FeS 2 cathode in secondary batteries. In this study, highly pure pyrite FeS 2 nanocrystals (NCs) with octahedral shape and 200–300 nm size have been synthesized via a facile and environmentally benign approach based on a surfactant-free aqueous reaction. Combined with a compatible ether electrolyte, the prepared FeS 2 NCs, despite their dimension far beyond the quantum confined regime, could achieve high utilization and reversibility as a cathode active material due to the well-defined crystal structure and the uncapped rough surfaces. Furthermore, we find that the last charging voltage step of FeS 2 only contributes a minor capacity but caused severe capacity fading due to the formation of soluble polysulfides. By suppressing this step through setting a proper upper cut-off voltage, the cycle life of the Li/FeS 2 cell is dramatically improved. The Li/FeS 2 cell running over a voltage window of 1.0–2.4 V at 1C delivers an initial capacity of 486.1 mA h g −1 , slightly lower than that running over 1.0–3.0 V (561.1 mA h g −1 ), but outperforms the latter substantially after 500 cycles (367 mA h g −1 vs 315 mA h g −1 ), corresponding to a capacity decay rate as low as 0.048% per cycle. Our results provide a meaningful approach for the development of not only the advanced FeS 2 material for long-life rechargeable batteries, but also other transition metal chalcogenide nanomaterials for a variety of potential applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 2
·1926-1937
·
IF 2.76
Jin Mingjie,Long Mingce,Su Hanrui,Pan Yue,Zhang Qiuzhuo,Wang Juan,Zhou Baoxue,Zhang Yanwu
To develop highly efficient and conveniently separable iron containing catalysts is crucial to remove recalcitrant organic pollutants in wastewater through a heterogeneous Fenton-like reaction. A maghemite/montmorillonite composite was synthesized by a coprecipitation and calcination method. The physiochemical properties of catalysts were characterized by XRD, TEM, nitrogen physisorption, thermogravimetric analysis/differential scanning calorimetry (TG/DSC), zeta potential, and magnetite susceptibility measurements. The influence of calcination temperatures and reaction parameters was investigated. The calcined composites retain magnetism because the presence of montmorillonite inhibited the growth of γ-Fe 2 O 3 nanoparticles, as well as their phase transition. The catalytic activities for phenol degradation were significantly enhanced by calcinations, which strengthen the interaction between iron oxides and aluminosilicate framework and result in more negatively charged surface. The composite (73 m 2 /g) calcined at 350 °C had the highest catalytic activities, with more than 99 % phenol reduction after only 35 min reaction at pH 3.6. Simultaneously, this catalyst exhibited high stability, low iron leaching, and magnetically separable ability for consecutive usage, making it promising for the removal of recalcitrant organic pollutants in wastewater.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 2
·1757-1768
·
IF 2.76
Zhao Yanxia,Sun Yangyang,Tian Chang,Gao Baoyu,Wang Yan,Shon Hokyong,Yang Yanzhao
Titanium-based coagulation is expected to achieve both efficient water purification and sludge recycling. This study is the first attempt to use titanium tetrachloride (TiCl 4 ) for silver nanoparticle (AgNP)-humic acid composite contaminant removal in a coagulation-ultrafiltration (C-UF) process, where characterization of flocs and membrane fouling under varied coagulant dose, initial solution pH, and AgNP concentration conditions are the main contents. Results suggested that the TiCl 4 achieved high AgNP removal in the form of silver nanoparticle through adsorption and sweep flocculation and simultaneously exerted additional 68.2 % higher dissolved organic carbon removal than Al 2 (SO 4 ) 3 . The TiCl 4 produced larger and stronger flocs but with weaker recoverability and less compact degree than did Al 2 (SO 4 ) 3 . Floc properties were independent of AgNP concentration except floc fractal dimension, which was negatively correlated with AgNP concentration. The TiCl 4 precoagulation caused less membrane fouling within wider pH range than Al 2 (SO 4 ) 3 did in the C-UF process. Incorporation of AgNPs during the TiCl 4 pretreatment process facilitated the mitigation of membrane fouling, which was, however, negligibly influenced by AgNP concentration in the case of Al 2 (SO 4 ) 3 .
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JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2016
·Vol. 87
·期 1
·45-51
·
IF 1.253
Zhou Mi,Cai Songtao,Li Jie,Qian Xin,Zheng Haha
A novel hybrid magnetic nanoparticle, which was fabricated by Fe 3 O 4 nanoparticle modified with β-cyclodextrin (Fe 3 O 4 @SiO 2 -GPTSCD), was prepared via a flexible method, including thermal decomposition, sol–gel process and ring-opening reaction of epoxy group. The structures had been characterized by fourier transform infrared spectra, transmission electron microscopy, and thermogravimetric analysis. The magnetic property of the resulting nanoparticles was kept, that they could be used for magnetic separation. Most excitingly, they showed high-efficiency catalytic activity with sodium hypochlorite and hydrogen peroxide as the oxidant in selective oxidation of benzyl alcohol, even higher than pure β-cyclodextrin (CD). It suggests that the hybrid nanoparticles are expected to be applied in more extensive fields, due to the combination of the activity of CD immobilized on the surface of nanoparticles and the characteristic of nanomaterials.
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