JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 21
·18614-18621
·
IF 2.324
Wang Ruibin,Ma Qianli,Wei Liqing,Yang Rendang
Cellulosic conductive paper/film reinforced by graphene is a promising substrate for energy storage applications due to its comparable conductivity, great flexibility and low cost. However, how to balance the content ratio of graphene/cellulose well is still a challenge. Because conductive paper of low graphene content usually has poor electrical property, while high graphene content is also discouraged owing to the decrease in other properties though electrically improved. Based on this, we developed a different method to produce the graphene/cellulose composite conductive paper. Instead of a separate intermediate-fabrication, starting materials here are continuously one-pot processed, in prior to casting the intermediate paper (solid phase). Next, it is reduced by the l -ascorbic acid solution (liquid phase), followed by a filtration to give the hetero-reduced conductive paper (HRCP). Our results indicate that HRCP possesses high conductivity up to 376 ± 4 S/m, along with good thermal and dynamic behaviors, at a relatively low graphene content of 20 wt%. Therefore, HRCP is expected to be utilized in the field of emerging energy storage.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-12
·
IF 3.125
Wang Qi,Ma Chunlei,Tang Jianke,Zhang Cuihong,Ma Lihua
Taking advantages of reticular proteins and reductive groups on the surface, eggshell membrane (ESM) was selected to synthesize MnO 2 nanoparticles from potassium permanganate through a super simple way in which ESM acted as both template and reductant. This process avoided harsh reaction conditions or complicated aftertreatments and thus owned the merits of green synthesis, handy operation, low cost, and easy purification. The ESM-templated MnO 2 nanoparticles (MnO 2 NPs/ESM) were characterized, and the content of nanomaterials on the template was tested. MnO 2 NPs/ESM showed a good capacity for decontamination of tetracycline hydrochloride (TCH). The macroscopical materials can be separated easily by taking the membrane out to stop the degradation instead of centrifugation or filtration. It was studied that 72.27% of TCH (50 mg/L) was decontaminated in 20 min by 0.1920 g/L MnO 2 nanoparticles, and removal efficiency could reach 83.10% after 60 min under buffered condition. The kinetics was studied with or without buffer, and it was concluded that the degradation process followed a pseudo-second-order model. The facile synthesis of materials and effective degradation would facilitate the nano-MnO 2 -based decontamination applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Natural Products and Bioprospecting
·
2018
·Vol. 8
·期 6
·413-418
·
IF 0
Wang Xia,Peng Xing-Rong,Lu Jing,Hu Gui-Lin,Qiu Ming-Hua
Abstract In present study, four new dammarane-type triterpenoids, namely caffruones A–D ( 1 – 4 ), were isolated from the cherries of Coffea arabica . Their structures were elucidated by extensive spectroscopic analysis including 1D, 2D NMR (HSQC, HMBC, 1 H– 1 H COSY, and ROESY), HRMS and IR spectra. This is the first time that tetracyclic triterpenes have been reported in genus Coffea . Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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.
✓ 已验证
DOI
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.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15662-15670
·
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOLOGICAL TRACE ELEMENT RESEARCH
·
2018
·Vol. 186
·期 2
·554-561
·
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 13
·9690-9700
·
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.
✓ 已验证
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-11
·
IF 4.122
Li Huihui,Zhao Hongting,Hao Shuangying,Shang Longcheng,Wu Jing,Song Chuanhui,Meyron-Holtz Esther G.,Qiao Tong,Li Kuanyu
Iron is essential for growth and proliferation of mammalian cells. The maintenance of cellular iron homeostasis is regulated by iron regulatory proteins (IRPs) through binding to the cognate iron-responsive elements in target mRNAs and thereby regulating the expression of target genes. Irp1 or Irp2 -null mutation is known to reduce the cellular iron level by decreasing transferrin receptor 1 and increasing ferritin. Here, we report that Irp1 or Irp2 -null mutation also causes downregulation of frataxin and IscU, two of the core components in the iron-sulfur cluster biogenesis machinery. Interestingly, while the activities of some of iron-sulfur cluster-containing enzymes including mitochondrial aconitase and cytosolic xanthine oxidase were not affected by the mutations, the activities of respiratory chain complexes were drastically diminished resulting in mitochondrial dysfunction. Overexpression of human ISCU and frataxin in Irp1 or Irp2 -null cells was able to rescue the defects in iron-sulfur cluster biogenesis and mitochondrial quality. Our results strongly suggest that iron regulatory proteins regulate the part of iron sulfur cluster biogenesis tailored specifically for mitochondrial electron transport chain complexes.
✓ 已验证
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2015
·Vol. 121
·期 1
·193-202
·
IF 1.704
Lü Mengyun,Guan Tengpeng,Li Ai-Hua,Sun Zhijun
In solvothermal synthesis of Er 3+ -doped NaGd 1− x
Yb
x
F 4 nanocrystals, morphology of the nanoparticles is dependent on the molar ratio of the chelating agent (e.g., trisodium citrate) to the lanthanide ions. Usually, addition of chelating agent is reported to be effective only when the molar ratio is below a critical value usually around 1 for the preparation of Er 3+ - and Yb 3+ -doped NaYF 4 nanocrystals. In this work, we found that, by increasing the Yb 3+ concentration, the critical molar ratio can be up to more than 4 in the preparation of Er 3+ -doped NaGd 1− x
Yb
x
F 4 nanocrystals, which provides a new route to control the nanoparticles’ size. The result is particularly useful for the synthesis of small Er 3+ -doped NaGd 1− x
Yb
x
F 4 nanocrystals with high concentration of the Yb 3+ dopant. We also investigated mechanisms on the formation of such particles ( β -NaGd 0.3 Yb 0.7 F 4 :Er 3+ ) with large size in a sub-micrometer scale, i.e., the aggregation-induced crystal growth. In addition, upconversion luminescence properties of the powdery samples were studied, which is shown to be dependent both on size of the nanoparticles and on dosage of the trisodium citrate.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）