CELLULOSE
·
2018
·Vol. 25
·期 8
·4831-4840
·
IF 3.809
Li Ya Dan,Li Wan Yun,Chai Hui Hui,Fang Can,Kang Yue Jun,Li Chang Ming,Yu Ling
Cotton thread has been proposed as a new, economically affordable material for the fabrication of microfluidic circuits for use in fast, low-cost, point-of-care diagnostic testing devices. In this work, chitosan, a biocompatible polymer, was used to modify cotton thread to improve its fluidic properties for microfluidic applications. Electrostatic-interaction-mediated adsorption of chitosan on alkaline-scoured thread can effectively increase thread’s solution hydrophilicity and wicking rate. Moreover, the proposed process conserves the thread’s hydrophilicity and fluidic properties even when stored for several months. As a microfluidic platform for enzymatic-reaction-associated colorimetric measurement, the suggested chitosan modification results in the accumulation of more analyte in the detection zone because of the improved flow rate, which enhances the colorimetric signal intensity. In this study, a glucose oxidase-mediated colorimetric glucose assay was demonstrated on a chitosan-modified microfluidic thread-based analytical device (μTAD). A linear range of 1–7.5 mM, a low detection limit of 0.2 mM, and a recovery rate between 93 and 98% was achieved in detecting glucose in artificial urine samples.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 15
·12771-12776
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IF 2.324
Qing Zhenjun,Ji Zhenguo
The effects of barium ions non-stoichiometry on the phase composition, microstructure, and microwave properties of Ba 1+x Co 2 V 2 O 8 (x = 0–0.5) ceramics were studied. XRD results show that the single phase of BaCo 2 V 2 O 8 was found in the composition of x equal to zero while a secondary phase of Ba 2 V 2 O 7 started to precipitate at 0.5 ≥ x ≥ 0.2, as confirmed by SEM and EDX. The appearance of Ba 2 V 2 O 7 phase with higher sintering temperature is the main reason of the increase of the optimum sintering temperature of the system. The comparisons between theoretical and experimental values of microwave dielectric properties indicate that the appearance of second phase (Ba 2 V 2 O 7 ) leads to the decrease of dielectric constant and the improvement of the temperature coefficient of frequency and the quality factor values. Ba 1.5 Co 2 V 2 O 8 ceramic sintered at 925 °C showed good properties: ε r = 11.5, Q × f = 47,230 GHz and τ f = − 32.1 ppm/°C.
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 2
·118-123
·
IF 0
Li Le,Wang Yuefei,Qi Wei,Su Rongxin,He Zhimin
In this paper, we report a new catalytic system for realizing the rapid and efficient oxidation of 5-hydroxymethylfurfural (HMF). First, we used 9-azabicyclo [3.3.1]nonan-3-one-N-oxyl (keto-ABNO) as a catalyst for the aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) in acetic acid. Then, we systematically studied the important reaction parameters, including the solvent, co-catalyst, and temperature. The results demonstrate that the acidic solvent used is crucial for the efficient oxidation of HMF to DFF. Under optimal conditions, we achieved a 93.4% yield of DFF within half an hour at room temperature. We also proposed the possible mechanism for this system.
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CELLULOSE
·
2018
·Vol. 25
·期 6
·3459-3469
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IF 3.809
Zhou Mengyao,Zhang Huihui,Qiao Yan,Li Chang Ming,Lu Zhisong
Abstract Textile-based flexible supercapacitors have attracted tremendous attention due to their great potentials in wearable electronics. It is highly desirable to develop facile methods, which are compatible with conventional textile industry, for the fabrication of high-performance and ultra-flexible textile-supported supercapacitors. Herein, a sandwich-structured supercapacitor with a poly(vinyl alcohol)/H 3 PO 4 -soaked cotton fabric as the electrolyte matrix, separator and supporting layer was prepared via screen-printing and transfer-printing techniques. Digital photographs and scanning electron micrographs were collected to verify the construction of the cotton fabric-sandwiched supercapacitor. The device possesses a gravimetric capacitance of 63.7 F g −1 at a current density of 1 A g −1 . After 2000 charging/discharging cycles, a capacitance retention of 85% could be achieved. The as-prepared supercapacitor can tolerate 100 times of bending or twisting with the capacitance maintaining at 89.7 and 93.3% of the original level, respectively. By designing the screen-printing mask, a squirrel-patterned supercapacitor was manufactured, showing that the proposed approach could combine both functionality and aesthetics. To demonstrate its feasibility, three in-series connected supercapacitors were produced on a T-shirt to light up a red lamp. This work may provide a facile approach to fabricating ultraflexible textile-based supercapacitors for potential applications in smart textiles and wearable electronics. Graphical Abstract
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2018
·Vol. 35
·期 7
·1500-1508
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IF 2.199
An Xiaojiao,Kang Yong,Li Guishui
The removal of single macromolecules impurity is the basis study for the promotion of flocculation technology application in the Chinese herbal medicine solution purification. We applied the flocculation process to remove gelatinized starch in solution. Three types of cationic polyacrylamide (CPAM) with different charge density were used for flocculation of gelatinized starch solution. The flocculation performance was evaluated in terms of the amylose removal ratio (AMRR), the amylopectin removal ratio (APRR), total starch removal ratio (TSRR) and supernatant turbidity (ST). The flocs were characterized by sedimentation performance, Fourier transform infrared (FTIR), scanning electron microscope (SEM) and X-ray photoelectric spectroscopy (XPS) method. The experimental results show that the flocculant CN15 has the best performance for gelatinized starch flocculation among three flocculants. According to the characterization analysis, the flocs exhibited an obvious network structure, and it is concluded that hydrogen bonding between N-H in CPAM and C-O in the starch and bridging flocculation played the essential roles in flocculation of the gelatinized starch.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2018
·Vol. 35
·期 7
·1570-1576
·
IF 2.199
Dai Yu,Zhu Xiaojun
This work systematically investigates the effect of modifier polyvinylpyrrolidone (PVP) on the microstructure, dielectric and energy storage properties of BaTiO 3 /PVDF composites. The results demonstrate that the BaTiO 3 nanoparticles modified by PVP are uniformly dispersed in the composites, and the defects including cracks and voids are obviously decreased in contrast to the composites with unmodified BaTiO 3 nanoparticles. Due to the enhanced interfacial polarization, the composites with BaTiO 3 @PVP show improved dielectric properties compared with the composites with unmodified BaTiO 3 nanoparticles. For instance, at 1 kHz, the dielectric constant and dielectric loss of the composite with 50 vol% of BaTiO 3 @PVP nanoparticles are 80.4 and 0.085, while of which the BaTiO 3 /PVDF are 35 and 0.265, respectively. The discharge energy density of the composites is largely improved with PVP engineered BaTiO 3 nanoparticles. The composite with 30 vol% BaTiO 3 @PVP achieves a discharged energy density of 4.06 J/cc at 240 kV/mm, which is 116% larger than that of pure PVDF (1.88 J/cc). This research provides an effect modifier to prepare high performance dielectric materials.
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高影响因子
Microfluidics and Nanofluidics
·
2018
·Vol. 22
·期 5
·1-8
·
IF 2.384
Gao Han,Xie Mao-Rong,Liu Jia-Juan,Fang Fang,Wu Zhi-Yong
Ion concentration polarization (ICP) effect is an effective preconcentration method for charged species in microfluidic systems. In recent years, ICP has also been introduced in paper-based analytical device (PAD) to improve the detection sensitivity. In this paper, a simple and cheap ICP interface was introduced in PAD by using commercial available ion exchange membrane (IEM) that is commonly used in industry. Significant ICP effect was observed by placing the IEM directly on a wetted paper fluidic channel, and electrokinetic stacking of both anion and cation probes was demonstrated with cation exchange membrane (CEM) and anion exchange membrane (AEM), respectively. Simply based on LED illumination and smart phone fluorescent imaging, about 10-fold signal improvement, was achieved for negatively charged fluorescent probes of fluorescein sodium and FITC-BSA with CEM, and 50-fold signal improvement was achieved for positively charged fluorescent probe of rhodamine 6G with AEM. The performance of this PAD was investigated with fluorescein sodium and rhodamine 6G, and the limits of detection of 0.34 and 0.011 μmol L −1 were achieved, respectively. This method provides a cost-effective route for improving the detection sensitivity of charged species on PAD taking advantage of ICP effect.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 12
·10453-10460
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IF 2.324
Yuan Rongrong,Liu Jianming,Xiang Weidong,Liang Xiaojuan
Various luminescent carbon materials are artificially synthesized and as admirable fluorescent materials because of the increased research of carbon nanodots (CDs). Herein, a novel solvent-dependent red CDs (rCDs) is introduced through solvothermal method. The as-prepared rCDs remain benzene structure and possess abundant surface function groups that endow them well solubility in various solvents. Furthermore, multicolor luminescence are observed when rCDs are dissolved in different solvents, and the emission wavelength of these materials can be well-tuned from 475 to 624 nm, which presents intensity solvent-dependent properties. Red luminescence carbon phosphors are successfully synthesized by mix rCDs with silica powder. Finally, warm white light emitting diodes (WLEDs) are constructed using rCDs powder with Ce 3+ : YAG single crystal and blue GaN chips. The results demonstrate that the rCDs can act as red component to modify the correlated color temperature (CCT) and the color rendering index (CRI) of WLEDs .
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高影响因子
CHEMICAL PAPERS
·
2018
·Vol. 72
·期 9
·2327-2337
·
IF 0.963
Xu Jing,Zhao Lele,Hou Wenlong,Guo Huiyun,Zhang Haiquan
The photocatalytic activity of thin film mainly depended on the morphology of thin film and lifetime of photo-generated charges. Here, we reported the effect of morphology adjusted through solvent vapor treatment (SVT) and different substrates on the photocatalytic activity of iron phthalocyanine (FePc) thin films. The FePc thin films on indium tin oxide (ITO) glass, copper (Cu), and quartz glass were prepared by vacuum evaporation, and their morphologies untreated and treated with solvent vapor such as benzene, petroleum ether, N,N -dimethylformamide for different time intervals; time intervals (0, 24, 36, 48, 72 h) were characterized by ultraviolet–visible spectroscopy, field-emission scanning electron microscopy, and X-ray diffractometer. The effects of thickness and substrate on photocatalytic activity of the FePc thin film were characterized accordingly. SVT could effectively adjust morphology (nanorods and nanosheets) of the FePc thin film and improve its photocatalytic activity for Rhodamine B (RhB) degradation under visible light irradiation. In addition, the thickness (10, 20, and 50 nm) and substrate (ITO, Cu, Quartz glass) of the FePc thin film also affected its photocatalytic activity. The degradation rate of RhB with the optimized FePc thin film on ITO substrate was reached 70.0%. We proposed that the morphology treated by SVT could increase the active sites of the FePc thin film and further improve its photocatalytic activity. The thickness and substrate of the FePc thin film were also discussed.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 6
·5704-5712
·
IF 2.914
Nkoom Matthew,Lu Guanghua,Liu Jianchao,Dong Huike,Yang Haohan
The non-steroidal anti-inflammatory drug (NSAID) diclofenac is one of the most frequently studied as well as controversially discussed pharmaceutically active drug on the subject of its relevance to the environment. This study was conducted to assess the bioconcentration potential of diclofenac and its behavioral and biochemical effects in Daphnia magna . The bioconcentration factors of diclofenac determined after 48 h of aqueous exposure in Daphnia magna were 70.94 and 8.02 for the nominal exposure concentrations of 5 and 100 μg/L, respectively. Diclofenac exposure obviously decreased the filtration and ingestion rates of the daphnids. A significant increase of the acetylcholinesterase activity that was observed in this study indicates that diclofenac might not have neurobehavioral toxicity in Daphnia magna . Significant induction of malondialdehyde content is an indication of overproduction of reactive oxygen species leading to oxidative damage in daphnids after diclofenac exposure. Moreover, significant inhibition of the superoxide dismutase, catalase, and glutathione reductase activities implies that the antioxidant defense system of Daphnia magna was overwhelmed. Also, significant inhibition of glutathione s-transferase activity might point to the fact that the enzyme was not capable to detoxify diclofenac in Daphnia magna . These findings indicate that diclofenac can accumulate and consequently stimulate behavioral and biochemical disturbances in Daphnia magna .
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PubMed
高影响因子
Nano Research
·
2019
·Vol. 12
·期 3
·651-657
·
IF 8.515
Lu Yan,Wang Wei,Chen Xiaowei,Zhang Yuhui,Han Yanchen,Cheng Yong,Chen Xue-Jiao,Liu Kai,Wang Yuanyuan,Zhang Qiaobao,Xie Shuifen
Platinum-based nanocrystals are the most effective electrocatalysts for accelerating the chemical transformations on the anode in direct alcohol fuel cells. To facilitate practical applications and overcome the drawbacks of diverse alcohols, it is significant to develop electrocatalysts with high activities and a wide fuel flexibility. Here, we demonstrate a practicable solution method for fabricating composition tunable trimetallic PtNiRu dendritic nanostructures (DNSs) which can serve as versatile and active catalysts for electrooxidation of a variety of liquid alcohols. A series of trimetallic DNSs with tunable Pt/Ni/Ru atomic ratios were successfully synthesized by simply adjusting the feeding of precursors. Detailed electrochemical test indicates that, among other compositions, the Pt 66 Ni 2 7Ru7 DNSs present much superior electroactivity in catalyzing electrooxidation of liquid alcohols in acidic mediums. Specifically, the mass activity and specific activity on the Pt 66 Ni 27 Ru 7 DNSs, for electrooxidation of methanol, ethanol, and ethylene glycol, are 4.57 and 4.34 times, 3.55 and 3.42 times, and 2.37 and 2.28 times that of the commercial Pt black, respectively. X-ray photoelectron spectroscopy and CO stripping studies reveal the adsorption of CO on these PtNiRu DNSs is much weaker than on pure Pt. Meanwhile, the surface Ru sites can provide neighbouring–OH groups to facilitate the oxidation and removal of the adsorbed intermediates (–CO) on the surface Pt sites, effectively improving the CO tolerance of the catalysts. The PtNiRu DNSs also show effectively boosted capacity for breaking the C–C bond in C 2 -alcohols, showing great potential for fuel-flexible fuel cell applications.
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高影响因子
SN Applied Sciences
·
2018
·Vol. 1
·期 1
·1-9
·
IF 0
Wei Q.,Wufuer A.,Wang M.,Wang Y.,Dai L.
Three-dimensional graphene (3DG) sponge has attracted increasing attention because it combines the unique properties of cellular materials and the excellent performance of graphene. Preparation of 3DG sponge depends mainly on the self-assembly of graphene oxide sheets. In the case of using uniform large graphene oxide and ultralarge graphene oxide sheets, the nematic liquid crystals (LCs) phases are formed at low concentration. After chemical reduction, the LCs of GO solution are converted to 3DG sponges with a high degree of orientation, offering a new methodology to regulate the controlled large GO sheets. The orientation of GO solution can be inherited by 3DG sponge, making the sponge to have a large-scale ordered network structure. The 3D elastic graphene sponges have low density and good elasticity, promising for the applications in strain sensing, shock damping, and energy cushioning. Our work explores a novel strategy for organizing the ordered alignment of controlled large GO sheets and exploring the relationship between the microstructures and mechanical properties of 3DG sponge.
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