Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-14
·
IF 3.125
Wang Rui,Wu Lixin,Zhuo Dongxian,Wang Zhengzhou,Tsai Tsung Yen
A C 60 -PEI-rGO hybrid was prepared by incorporating the fullerene (C 60 ) on the surface of PEI-modified reduced graphene oxide (rGO) and then used to modify the epoxy (EP) resin. Subsequently, the structure of GO and C 60 -PEI-rGO hybrid were well characterized, showing that the C 60 was homogenously anchored on the surface of PEI-rGO. The flame retardancy, mechanical properties, and thermal stability of as-prepared C 60 -PEI-rGO/EP nanocomposites were systematically investigated. Results show that the C 60 -PEI-rGO hybrid exhibits high flame retarding efficiency for EP. Specifically, the time to ignition of epoxy increases from 68 to 89 s with the addition of 1.0 wt% C 60 -PEI-rGO, which are unusual in polymer nanocomposites. In the meantime, the peaks of the heat release rate and total heat release of the modified epoxy reduce by 40.0% and 15.6%, respectively. The synergistic flame retardant mechanism of C 60 -PEI-rGO to EP is attributed to its unique structure combining both the high efficiency in capturing free radicals by C 60 , the barrier effect of layered of rGO and increase of crosslinking density of epoxy. It is shown that the thermal stability and mechanical properties of epoxy are simultaneously improved with the addition of C 60 -PEI-rGO. This work may pioneer a new and efficient method to fabricate fire retardant thermosetting resins with simultaneously other improved properties.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Energy
·
2018
·Vol. 3
·期 12
·1067-1075
·
IF 46.859
Gao Wenbo,Guo Jianping,Wang Peikun,Wang Qianru,Chang Fei,Pei Qijun,Zhang Weijin,Liu Lin,Chen Ping
Ammonia is a promising carbon-free energy carrier, but is currently synthesized industrially under harsh conditions. Synthesizing ammonia using lower temperatures and pressures could therefore improve its prospects as a chemical means to store and transport energy. Here we report that alkali and alkaline earth metal imides function as nitrogen carriers that mediate ammonia production via a two-step chemical looping process operating under mild conditions. Nitrogen is first fixed through the reduction of N 2 by alkali or alkaline earth metal hydrides to form imides and, subsequently, the imides are hydrogenated to produce NH 3 and regenerate the metal hydrides. The oxidation state of hydrogen therefore switches between −1 (hydride), 0 (H 2 ) and +1 (imide and NH 3 ). Late 3d metals accelerate the reaction rates of both steps. The chemical loop mediated by BaNH and catalysed by Ni produces NH 3 at 100 °C and atmospheric pressure.
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2018
·Vol. 10
·期 4
·1-15
·
IF 7.381
Xue Peng,Yang Ruihao,Sun Lihong,Li Qian,Zhang Lei,Xu Zhigang,Kang Yuejun
Indocyanine green (ICG) is capable of inducing a photothermal effect and the production of cytotoxic reactive oxygen species for cancer therapy. However, the major challenge in applying ICG molecules for antitumor therapy is associated with their instability in aqueous conditions and rapid clearance from blood circulation, which causes insufficient bioavailability at the tumor site. Herein, we conjugated ICG molecules with Prussian blue nanoparticles enclosing a Fe 3 O 4 nanocore, which was facilitated by cationic polyethyleneimine via electrostatic adsorption. The nanocarrier-loaded ICG formed stable aggregates that enhanced cellular uptake and prevented fluorescence quenching. Moreover, the strong superparamagnetism of the Fe 3 O 4 core in the obtained nanocomposites further improved cellular internalization of the drugs guided by a localized magnetic field. The therapeutic efficacy of this nanoplatform was evaluated using tumor models established in nude mice, which demonstrated remarkable tumor ablation in vivo due to strong photothermal/photodynamic effects. This study provides promising evidence that this multifunctional nanoagent might function as an efficient mediator for combining photothermal and photodynamic cancer therapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 24
·21138-21144
·
IF 2.324
Zhu Wentao,Lv Yanqi,Chen Huanhuan,Yang Jiawei,Zhou Xingfu
TiO 2 nanorod arrays of crystalline Cd, Y-co-doped rutile were synthesized and successfully assembled in perovskite solar cells (PSCs) as the photoanode. In this work, CH 3 NH 3 PbI 3−x Cl x was used as the light absorber and spiro -OMeTAD as hole transport material (HTM). The synthesized TiO 2 nanorod arrays were investigated by field emission-scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD) and UV–Vis diffused reflectance. FE-SEM images indicate that the co-doped TiO 2 nanorod arrays were slightly sparser and shorter in length than that of un-doped ones. XRD pattern demonstrates that the as-prepared TiO 2 nanorod arrays were rutile phase. The UV–Vis spectrum proves that the co-doped samples possess higher light scattering intensity than the un-doped samples, which may contribute to improve the short current density of PSCs. And the band gap of the TiO 2 nanorod shows a positive shift when doped with cadmium and ytterbium. Furthermore, a negative shift in the flat-band potential (V fb ) was also observed. Finally, the device based on co-doped TiO 2 nanorod arrays has improved open circuit voltage (V oc ) and short circuit current density (J sc ). A higher power conversion efficiency (η) of 9.06% was obtained for the co-doped device while 8.12% for the un-doped TiO 2 nanorod arrays. This paper opens a door to multi-element co-doped 1-D nanostructured materials for the improving the open circuit voltage and short circuit current density of perovskite solar cells.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2019
·Vol. 29
·期 3
·769-777
·
IF 1.913
Luo Kuan,Jiang Xinyu
Nitrogen-sulfur co-doped carbon quantum dots (N, S-CQDs) with good photoluminescence properties were prepared by hydrothermal method using citric acid (CA) and methionine (Met) as precursors. Co-doping with N and S facilitates the electron transfer rate and coordination interaction between N,S-CQDs and Fe(III) ions which acts as a quencher of fluorescence. Based on a simple redox principle, a highly sensitive and selective method for the detection of ascorbic acid (AA) and H 2 O 2 was successfully developed. The calibration curves obtained are linear for the current versus AA and H 2 O 2 concentration over the range 50–500 μM and 10–140 μM, respectively. And the detection limits for AA and H 2 O 2 are 4.2 μM and 1.9 μM, respectively. The quantitative analysis of AA and H 2 O 2 in various juices and H 2 O 2 disinfectant with Fe 3+ /CQDs or Fe 2+ /CQDs gave the recoveries of 87.8%–117.5% and 99.2%–106.4% with relative standard deviations ( RSD ) of 1.6–5.1% and 1.7–3.1%, respectively, showing satisfactory results for the determination of AA and H 2 O 2 in actual application. The proposed strategy may provide a new pathway to developing inexpensive and sensitive way for the detection of various redox reaction–involved system.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-8
·
IF 5.479
Kong Fen-Ying,Li Rong-Fang,Yao Lei,Wang Zhong-Xia,Lv Wei-Xin,Wang Wei
A glassy carbon electrode (GCE) was modified with a nanocomposite prepared from nitrogen-doped reduced graphene oxide (N-rGO) and single walled carbon nanotubes (SWCNTs), and then loaded with platinum nanoparticles (Pt NPs) to obtain a voltammetric sensor for daunorubicin (DNR). Reductive doping of GO and the crystallization of the Pt NPs were carried out in a one-step hydrothermal process. The modified electrode was characterized by cyclic voltammetry and differential pulse voltammetry. It exhibited high sensitivity compared with unmodified electrode. Some experimental parameters which affected sensor response were optimized. Under optimum conditions and at a working voltage of typically −0.56 V (vs. Ag/AgCl), the sensor has a low detection limit (3 ng mL −1 ), a wide linear range (0.01–6 μg mL −1 ) and good long-term stability. The method was successfully applied to the sensitive and rapid determination of DNR in spiked human serum samples.
Platinum nanoparticles were loaded onto a nanocomposite prepared from nitrogen decorated reduced graphene oxide and single-walled carbon nanotubes (N-rGO-SWCNTs-Pt) and then used for electrochemical determination of daunorubicin (DNR).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2019
·Vol. 12
·期 7
·1674-1683
·
IF 2.413
Li He,Wu Chun-Jian,Tang Xiang-Yi,Yu Shu-Juan
The 2,3-dihydro-3,5-dihydroxy-6-methyl-4(H)-pyran-4-one (DDMP), 5-hydroxymethylfurfural (HMF), furfural, and 5-methylfurfural (MF) are the components of caramel colors with intense bitterness. In this study, a practical and simple method for the simultaneous analysis of these four bitter compounds in caramel colors and beverages was proposed using high-performance liquid chromatography–diode array detector–atmospheric pressure chemical ionization–mass spectrometry (HPLC-DAD-APCI-MS). For the sample preparation, the extract efficiencies from different extract solvents and quick, easy, cheap, effective, rugged, and safe (QuEChERS) salt pockets were compared. The correlation coefficients ( R 2 ) of all analytical curves were ≥ 0.9914. The satisfactory recoveries ranged between 70.1% and 101.5%, with relative standard deviations ranged from 1.7% to 9.1%. The matrix effect was evaluated, and HMF, furfural, and MF showed signal enrichment. This method was successfully applied to the analysis of bitter compounds content in several caramel colors and beverages from a local market in China. Four compounds were found in eight samples, with concentration ranging from 0.5 to 1058.1 mg kg −1 .
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 11
·5485-5494
·
IF 2.289
Wang Xiaoqing,Tian Songran,Zhang Xiaoqing,Li Guoyan,Liu Ying,Chen Botao,Cheng Bowen
A 3D Ni 3 S 2 @Mn-Co-OH/NF cross-linked nanosheet heterostructure composite electrode has been successfully fabricated by a facile two-step hydrothermal method. The as-prepared Ni 3 S 2 @Mn-Co-OH/NF composite electrode exhibits a high capacitance (3163 F g −1 at a current density of 3 mA cm −2 ), a superior rate performance (2071 F g −1 at a current rate of 30 mA cm −2 ), and stable cycling property (maintaining 96.6% of the initial capacitance after 4000 cycles at a current rate of 10 mA cm −2 ). This excellent electrochemical performance can be ascribed to the unique cross-linked nanosheet heterostructure formed directly on Ni foam current collector and the synergistic effect between Mn-Co-OH and Ni 3 S 2 of the composite electrode.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 3
·370-376
·
IF 1.071
Wu Shuo,Yang Xinlan,Zhao Yanqiu
A biomolecule-free photoelectrochemical(PEC) probe(denoted as Ru-1) was designed, synthesized and coupled with TiO 2 nanoparticles(NPs) for the highly sensitive and selective PEC detection of Hg 2+ , a model analyte with hypertoxicity to both human health and ecosystem. The probe Ru-1 was designed with Ru(II) bipyridyl complex as the chromophore, thiocyanate ligand as the recognition unit, and carboxylate group as the linkage site to connect Ru-1 to TiO 2 nanoparticles. Under irradiation, Ru-1 shows strong affinity to TiO 2 and good photophysical properties of strong visible light absorption, slow electron-hole(e-h + ) recombination, and fast photoelectron injection to TiO 2 nanoparticles via the π -bridge of 4-(2,2′-bipyridin)-4-yl-thiophene moiety. However, the specific coordination of Hg 2+ with Ru-1 via the thiol moiety in the thiocyanate enlarges the band gap of the complex and reduces the photocurrent significantly. The synergistic interaction between TiO 2 nanoparticles and the Ru-1 complex led to a selective PEC sensing strategy for Hg 2+ detection. Detectable linear ranges from 10 −12 g/mL to 10 −7 g/mL and from 10 −7 g/mL to 10 −3 g/mL were obtained without the interference from possibly co-existed metal ions. The good analytical performances indicate the chemical probe based biomolecule-free PEC platform may offer a new route for the detection of biologically and environmentally important small molecules.
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2019
·Vol. 12
·期 5
·1173-1179
·
IF 8.515
Xu Yanchao,Cui Xiaoqiang,Wei Shuting,Zhang Qinghua,Gu Lin,Meng Fanqi,Fan Jinchang,Zheng Weitao
The development of highly efficient Pt-based alloy nanocatalysts is important but remains challenging for fuel cells commercialization. Here, a new class of zigzag-like platinum-zinc (Pt-Zn) alloy nanowires (NWs) with rough surface and controllable composition is reported. The merits of anisotropic one-dimensional nanostructure, stable high-index facets and coordinatively unsaturated Pt sites endow the composition-optimal Pt 94 Zn 6 NWs with a mass activity of 7.2 and 6.2 times higher than that of commercial Pt black catalysts toward methanol/ethanol oxidation, respectively. Alloying-induced d -band electron modulation and lattice strain effects weaken the adsorption strength of poisoning species, which originally enhances the catalytic activity of Pt-Zn NWs. This study provides a new perspective of Pt-Zn electrocatalysts with intrinsic mechanism for enhanced catalytic performance.
✓ 已验证
产品关联
DOI
高影响因子
Microbial Cell Factories
·
2019
·Vol. 18
·期 1
·1-10
·
IF 4.402
Xu Jian-Miao,Li Jian-Qiang,Zhang Bo,Liu Zhi-Qiang,Zheng Yu-Guo
Background l -2-aminobutyric acid ( l -ABA) is an unnatural amino acid that is a key intermediate for the synthesis of several important pharmaceuticals. To make the biosynthesis of l -ABA environmental friendly and more suitable for the industrial-scale production. We expand the nature metabolic network of Escherichia coli using metabolic engineering approach for the production of l -ABA. Results In this study, Escherichia coli THR strain with a modified pathway for threonine-hyperproduction was engineered via deletion of the rhtA gene from the chromosome. To redirect carbon flux from 2-ketobutyrate (2-KB) to l -ABA, the ilvIH gene was deleted to block the l -isoleucine pathway. Furthermore, the ilvA gene from Escherichia coli W3110 and the leuDH gene from Thermoactinomyces intermedius were amplified and co-overexpressed. The promoter was altered to regulate the expression strength of ilvA* and leuDH . The final engineered strain E. coli THR Δ rhtA Δ ilvIH /Gap- ilvA *-Pbs- leuDH was able to produce 9.33 g/L of l -ABA with a yield of 0.19 g/L/h by fed-batch fermentation in a 5 L bioreactor. Conclusions This novel metabolically tailored strain offers a promising approach to fulfill industrial requirements for production of l -ABA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 11
·8332-8345
·
IF 3.442
Wang Qianqian,Cui Jiuyun,Liu Siwei,Gao Jia,Lang Jihui,Li Chunxiang,Yan Yongsheng
The worldwide oily wastewater is one of the most serious environmental problems. The current membrane separation technology has received an increasing attention toward oil/water emulsions separation. Here, a high-efficient superhydrophilic and underwater superoleophobic membrane with improved antifouling property was fabricated based on modified halloysite nanotubes anchored at polyvinylidene fluoride/graphene oxide membrane surface via polydopamine adhesive. The composite membrane exhibited an outstanding antifouling performance as well as high pure water flux (1500 L m −2 h −1 ) under gravity driven. Besides, the as-prepared composite membrane could separate both surfactant-free and surfactant-stabilized oil/water emulsions with separation efficiency up to 99.5%. Moreover, this facile preparation and eco-friendly composite membrane provides promising practical application toward environmental remediation.
✓ 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）