JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 10
·8380-8389
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IF 2.324
Zhou Xuefei,Jia Kun,He Xiaohong,Wei Shiliang,Wang Pan,Liu Xiaobo
A series of water-soluble carboxylated zinc phthalocyanine (ZnPc-COOH) were obtained from a facile hydrolyzation of terminating nitriles groups of zinc phthalocyanine synthesized via bisphthalonitrile based precursor. After the gold nanoparticles (Au NPs) with positively charged surfactant CTAB was added to as-prepared ZnPc-COOH solution, the electronic interaction between them would contribute to the tunable conjugate of Au NPs/ZnPc-COOH and lead to a red-shifted absorption peak in UV–Vis spectrum. Specially, both of the amount of phthalocyanine rings and concentrations of ZnPc-COOH would make a big difference in the interaction with Au NPs. In the presence of different metal ions, the ZnPc-COOH/Au NPs aqueous solution revealed selective response to Ca 2+ , leading to an increased aggregation extent and the naked eye visualized color change. The further experiment revealed that the red-shift was accessible in a wide concentration range of Ca 2+ , and the red-shift degree was proportional to the concentration of Ca 2+ in the range of 2–8 µM with a limit of detection defined as 1 µM. Combing the photosensitivity of ZnPc-COOH and localized surface resonance plasmon of Au NPs, this label-free probe would provide a potential application in colorimetric detection and photosensitization under physiological environment.
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International Journal of Minerals Metallurgy and Materials
·
2018
·Vol. 25
·期 3
·310-314
·
IF 1.261
Li Shi-na,Ma Rui-xin,Wang Cheng-yan
The Cu 2 MoS 4 nanoparticles were prepared using a relatively simple and convenient solid-phase process, which was applied for the first time. The crystalline structure, morphology, and optical properties of Cu 2 MoS 4 nanoparticles were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and UV-vis spectrophotometry. Cu 2 MoS 4 nanoparticles having a band gap of 1.66 eV exhibits good photocatalytic activity in the degradation of methylene blue, which indicates that this simple process may be critical to facilitate the cheap production of photocatalysts.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 9
·5439-5453
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IF 1.674
Huang Feng,Li Wenzhi,Zhang Tingwei,Li Dawei,Liu Qiyu,Zhu Xifeng,Ma Longlong
A carbonaceous solid acid catalyst with high strong-acid density was synthesized by facile functionalization of a biomass-derived mesoporous carbon with benzenesulfonic acid. The catalyst was characterized by using Fourier transform infrared spectroscopy, elemental analysis, X-ray photoelectron spectroscopy, transmission electron microscopy, and N 2 adsorption–desorption. The carbonaceous solid catalyst containing Brønsted acid sites was used for the production of 5-hydroxymethylfurfural (HMF) from hexoses such as fructose, glucose, and cellulose in γ-valerolactone (GVL)-H 2 O mixture. By reaction at 130 °C for 20 min using fructose as a feedstock, an HMF yield 78.1% was achieved. The catalytic performance of the catalyst in conversion of fructose into HMF hardly changed over seven cycles, demonstrating that the catalyst had excellent recyclability. The yields of HMF derived from glucose and cellulose reached 33.2 and 22.5%, respectively, whereas those of total furans were 42.1 and 33.7%, respectively. The proposed reaction system was promising in transforming biomass-based carbohydrates into fine chemicals, given the use of green functionalization methods, the utilization of sustainable biomass-derived carbon precursor and solvents, catalyst with high acid density, and the availability of high HMF yield.
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INTERNATIONAL JOURNAL OF THERMOPHYSICS
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2018
·Vol. 39
·期 5
·1-11
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IF 0.829
Fan Desong,Sun Si,Guo Li
A novel thermal control coating was presented based on the thermochromism of manganite. The pigment of K-doped manganite nanoparticles was dispersed into polymer matrix to prepare the coating with curing below 200 \(^{\circ }\) C. The nanoparticles size mainly distributes around 100–200 nm, and it shows a comparable stoichiometric ratio. The phase transition of the nanoparticles was observed from ferromagnetic metallic to paramagnetic insulator state. With increasing K doping level, the phase transition temperature increases, achieving controllable adjustment. Coating surface with and without pore defect was obtained by different polymer matrix. A sharp emittance variation was observed with increasing temperature in K-doped coating. The variation magnitude of emittance is up to 0.46, which is attractive to space thermal control. It is suggested that the pigment content of 50 wt% is sufficient to realize a large emittance variation.
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CELLULOSE
·
2018
·Vol. 25
·期 5
·2987-2996
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IF 3.809
Li Zhaoqian,Qiu Jia,Shi Yu,Pei Chonghua
Wettability-switchable bacterial cellulose/polyhemiaminal nanofiber aerogels were successfully prepared by a facile in situ polymerization of paraformaldehyde and 4,4′-diaminodiphenyl ether. The resultant aerogels displayed an interconnected porous structure, superior porosity, low density as well as hydrophobic–oleophilic properties. The aerogels could not only quickly and efficiently absorb the variety of oils or organic solvents from water, but also completely release the adsorbates in acid aqueous solutions by the aid of wettability switch (from hydrophobicity–oleophilicity to underwater superoleophobicity). Furthermore, the aerogels can continuously collect oils both on the water surface and in water-in-oil emulsions by a peristaltic pump.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Wang Yanwei,Zhou Xiaojuan,Xu Chunli,Jin Yan,Li Baoxin
Chirality plays a key role in modern science and technology. Here, we report a simple and effective sensing platform for visual chiral recognition of enantiomers. In this sensing platform, gold nanorods (AuNRs) prepared through a common synthesis route are used as colorimetric probes for visual recognition of glutamine (Gln) enantiomers. D-Gln could rapidly induce the aggregation of AuNRs, thereby resulting in appreciable blue-to-gray color change of AuNRs solution; however, L-Gln could not induce color change of AuNRs. This distinct color change can be easily distinguished by the naked eyes; as a result, a visual method of chiral recognition was suggested. The method was applied to determine the enantiometric excess of D-Gln through the whole range of −100% ~ 100%. The chiral assay can be performed with a simple UV-vis spectrometer or the naked eyes. Notably, the AuNRs do not need any chiral labeling or modification, and the chiral recognition is based on the inherent chirality of AuNRs. This chiral assay method is simple, sensitive, cheap and easy to operate. This study is the first example using AuNRs for direct visual recognition of enantiomers, and will open new opportunity to construct more chiral recognition methods for some important compounds.
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PubMed
高影响因子
Food Analytical Methods
·
2018
·Vol. 11
·期 9
·2518-2527
·
IF 2.245
Yaseen Tehseen,Sun Da-Wen,Pu Hongbin,Pan Ting-Tiao
In this work, surface-enhanced Raman spectroscopy (SERS) was used with silver colloid substrate for rapid detection of omethoate (an organophosphate pesticide) in standard solution and peach extract. The findings demonstrated that the characteristic wavenumber of the pesticide could be precisely identified using the SERS method. The calibration curve was plotted between concentrations and Raman intensities of the target peak at 1649 cm −1 for the peach extract and at 1647 cm −1 for the standard solution. The coefficients of determination ( R 2 ) of 0.9829 and 0.98 were obtained for standard solution and for peach extract, respectively. The calculated limits of detection for omethoate in standard solution and in peach extracts were 0.001 mg L −1 and 0.01 mg kg −1 , respectively. This study revealed that the proposed method could be used for the analysis of trace contaminants like omethoate in multifaceted food matrices.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Yu Xinsheng,Hu Lianzhe,Zhang Feng,Wang Min,Xia Zhining,Wei Weili
A dual-channel ratiometric nanoprobe is described for detection and imaging of microRNA. It was prepared from MoS 2 quantum dots (QDs; with blue emission and excitation/emission peaks at 310/398 nm) which acts as both the gene carrier and as a donor in fluorescence resonance energy transfer (FRET). Molecular beacons containing loops for molecular recognition of microRNA and labeled with carboxyfluorescein (FAM) were covalently attached to the MoS 2 QDs and serve as the FRET acceptor. In the absence of microRNA, the nanoprobe exhibits low FRET efficiency due to the close distance between the FAM tag and the QDs. Hybridization with microRNA enlarges the distance between QD and beacon. This results in an enhancement of the FRET efficiency of the nanoprobe. The ratio of green and blue fluorescence (I 520 /I 398 ) increases linearly in the 5 to 150 nM microRNA concentration range in both aqueous solution and diluted artificial cerebrospinal fluid. The limit of detection (LOD) is as low as 0.38 nM and 0.52 nM, respectively. Other features of this nanoprobe include (a) excellent resistance to nuclease-induced false positive signals and (b) the option to use it for distinguishing different cell lines by in-situ imaging of intracellular microRNAs.
Schematic of a dual-channel photoluminescence nanoprobe for the determination of microRNA-21 (miR-21) by monitoring the microRNA-triggered enhancement of the fluorescence resonance energy transfer (FRET) efficiency between MoS 2 QDs and carboxyfluorescein-labeled molecular beacons.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 13
·9690-9700
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IF 2.993
Huang Jinxin,Wang Jinglun,Zhong Haoxiang,Zhang Lingzhi
N -cyanoethyl polyethylenimine (CN-PEI) is synthesized by modifying polyethylenimine (PEI) with acrylonitrile through a Michael addition reaction. Depending on cyanoethylation level, CN-PEI can be obtained as a form of solution, micro-emulsion or emulsion in water. CN-PEI micro-emulsion is investigated as water-soluble binder for the application of lithium iron phosphate (LFP) cathode in lithium-ion batteries. CN-PEI binder not only maintains the outstanding dispersion capability of PEI but also exhibits an excellent adhesion strength and higher ionic conductivity because of the introduction of polar cyano groups. As a result, CN-PEI binder can effectively maintain the mechanical integrity and decrease the polarization of LFP electrode during the operation of the battery. LFP electrode with CN-PEI binder exhibits good cycle stability and enhanced rate performance delivering a capacity of 99.6% at a rate of 0.5 C after 100 cycles and a high discharge capacity of 102.4 mAh g −1 at 5 C.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15662-15670
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IF 2.8
Li Ji,Wang Yanhong,Tian Yiyuan,He Xuan,Yang Pingping,Yuan Minghui,Cao Yuqing,Lyu Jinze
The photocatalytic mineralization efficiency of volatile organic compounds (VOCs) is determined by adsorption of reactants, separation of charge carriers, and reaction activity of catalyst surface. Herein, we provide a strategy to synthesize a novel catalyst, namely, PhPt-Micro, which is characterized by high adsorption ability, charge separation efficiency, and surface reaction activity. Toluene was chosen as the model VOC. The effects of photochemical deposition of Pt on the physical properties of microporous amorphous TiO 2 (Micro) and toluene mineralization were studied using N 2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) analyses. After photochemical treatment, the structure of Micro was optimized, and Pt nanoparticles were successfully deposited at the outlet of electrons on the catalyst surface. SPS result proved that the optimized structure enhanced the separation efficiency of charge carriers and the migration of photo-generated electrons to the PhPt-Micro surface. The quasi-equilibrium adsorption amount of toluene over PhPt-Micro was two times higher than that with commercial nano TiO 2 (P25). The micropores concentrated toluene on the catalyst surface and hindered intermediate desorption. The mineralization efficiency of toluene over PhPt-Micro was 2.4 and 5.9 times higher than those over Micro and P25, respectively.
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BIOLOGICAL TRACE ELEMENT RESEARCH
·
2018
·Vol. 186
·期 2
·554-561
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IF 2.361
Liu Hao,Luo Jiaoyang,Ding Tong,Gu Shanyong,Yang Shihai,Yang Meihua
In this paper, a simple and cost-effective method using high-performance liquid chromatography in conjunction with inductively coupled plasma mass spectrometry with a rapid ultrasound-assisted extraction was used for analysis speciation of trace mercury in sea cucumber species of Apostichopus japonicus . The effective separation of inorganic mercury, methylmercury, and ethylmercury was achieved within 10 min using Agilent ZORBAX SB-C 18 analytical and guard columns with an isocratic mobile phase consisting of 8% methanol and 92% H 2 O containing 0.12% L-cysteine ( m / v ) and 0.01 mol/L ammonium acetate. Mercury species were extracted from A. japonicus samples using a solution containing 2-mercaptoethanol, L-cysteine, and hydrochloric acid and sonicating for 0.5 h. The limits of detection of inorganic mercury, methylmercury, and ethylmercury were 0.12, 0.08, and 0.20 μg/L, and the minimum detectable concentrations (measured at 0.500 g sample volume in 10.00 mL) were 2.4, 1.6, and 4.0 μg/kg, respectively. Analysis of a scallop certified reference material (GBW 10024) revealed accordance between the experimental and certified values. This study provides a reference for the evaluation of mercury speciation in sea cucumber and other seafood.
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 3
·580-586
·
IF 1.353
Liu Haifeng,Wang Zhu,Sun Chengjun
A facile and inexpensive way to prepare self-crosslinkable poly(dimethylsiloxane) (PDMS) for superhydrophobic treatment of cotton fabrics is reported in the study. Through thiol-ene click reaction between mercaptopropyltrimethoxysilane (MPTMOS) and vinyl-containing poly(dimethylsiloxane) (VPDMS), PDMS-g-TMOS can be simply and quickly synthesized. The trimethoxysilane group of PDMS-g-TMOS can react with hydroxyl group on cotton fabric and other -Si(OCH 3 ) 3 groups. The synthesized polysiloxane (PDMS-g-TMOS) was identified by FT-IR and 1 H-NMR. The morphology of the treated cotton fabric was observed by SEM and XPS was used to analyze the elemental composition on the surface of cotton fabric. The analysis results indicated that the surface was fully covered with PDMS. Due to the low surface energy of PDMS and the rough surfaces of cotton fabric, the optimized water contact angle (WCA) and sliding angle were respectively 154°±0.4° and 14°±0.5°, indicating superhydrophobicity. Moreover, water spray test (AATCC Test Method 22-2010) was also applied to evaluate the water repellency of treated cotton fabric and a score of 90 was assigned according to AATCC Test Method 22-2010. The durability of treated cotton fabric was tested by 50 laundering cycles. The resultant WCA barely decreased and the score of water spray test dropped from 90 to 80, showing the reasonable wash durability.
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