Plasmonics
·
2018
·Vol. 13
·期 5
·1749-1758
·
IF 2.366
Lin Xiang,Lin Shuang,Liu Yuanlan,Zhao Haiyan,Wang Li,Hasi Wuliji
Large-scale ordered two-dimensional (2D) superlattices at oil/water interface were fabricated using single-crystal Au nanospheres (NSs) with different diameters as building blocks. A “drain-to-deposit” strategy was used to successfully transfer the ordered superlattices onto silicon wafer. Due to the ultra-smooth and highly spherical morphology of the monodisperse Au NSs, the UV-Vis extinction spectra of individual Au nanosphere (NS) obtained from theoretical calculations by finite-difference time-domain (FDTD) method could match well with the experimental test results. Moreover, the extinction spectra of the 2D superlattice based on the different diameters of Au NSs were also measured and calculated. Additionally, with R6G as probe molecules, the surface-enhanced Raman spectroscopy (SERS) performances of the prepared superlattices were evaluated. Through investigating the electromagnetic (EM) field distribution simulation results of 2D superlattices of Au NSs with different diameters, the two results reveal rather consistently. The large-scale 2D plasmonic superlattices possess precise and tunable localized surface plasmon resonance (LSPR) property, which enables them to have great application prospect in solar cells, SERS detection, and other fields.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 23
·15895-15906
·
IF 2.993
Sun Li,Lv Pengcheng,Li Haonan,Wang Fa,Su Wenxian,Zhang Lixin
Abstract The green and controllable synthesis of Au–Ag alloy nanoparticles (NPs) in one-pot has been a challenge in nanotechnology. Here, the soluble starch was employed as a reducing and capping agent to synthesize stable Au–Ag alloy NPs without using any toxic agent. The surface plasmon resonance wavelength and the composition of Au–Ag alloy NPs could be continuously adjusted only by the synthesis time in one-pot. Au–Ag alloy NPs were characterized by means of various techniques. It could be found as-prepared NPs were quasi-spherical with a small average size and a face-centered cubic polycrystalline structure. The above green synthesis method, facile, efficient and eco-friendly, can be extended to the controllable synthesis of other bimetallic NPs. Obtained Au–Ag alloy NPs exhibited a superior photocatalytic activity and stability for the 4-nitrophenol (4-NP) degradation due to abundance hydroxyl groups of the soluble starch and the synergistic effect between Au and Ag elements. The rate constant of 4-NP degradation could be linearly tuned by the composition of Au–Ag alloy NPs and their synthesis time besides their addition amount. The above methods to control the rate constant provide promising routes for other photocatalytic reactions using bimetallic NPs as photocatalysts. Graphical Abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 19
·16799-16804
·
IF 2.324
Peng Xiaohan,Liu Xiaolin,Qu Peng,Yang Bing
Boron nitride nanosheets (BN NSs) with about 2 nm thickness and 200–400 nm lateral sizes were prepared by ultrasonically exfoliating bulk boron nitride (BN) powders in deionized water (DI). BN NSs/polyvinylidene fluoride (PVDF) composites were fabricated by a solution casting method. The enhanced breakdown strength and energy density of the composites were obtained at a low BN NSs weight fraction. The maximum breakdown strength and discharged energy density of 8 wt% BN NSs/PVDF composites reached to 486 kV/mm and 7.25 J/cm 3 , respectively, which led to 54 and 99% increase compared with pure PVDF (306 kV/mm, 3.63 J/cm 3 ). Meanwhile, the loss tangent of BN NSs/PVDF composites was lower than pure PVDF. The enhanced dielectric properties could be attributed to BN NSs with high insulation and wide band gap. In addition, two-dimensional (2D) BN NSs fillers tended to be perpendicular to the applied electric field and effectively acted as insulating barriers to improve the breakdown strength and energy density.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 28
·期 6
·2701-2713
·
IF 1.754
Wu Gang,Guo Shuang,Yin Yue,Sun Gang,Zhong Yongjian,You Bo
This paper presented a facile method to prepare the silica/poly (methyl methacrylate) (SiO 2 /PMMA) nanocomposite hollow microspheres (NHSs) which were firstly applied to fabricate the light diffusion films with high transmittance and high haze simultaneously. The SiO 2 /PMMA NHSs were prepared via in situ diffusion of polymeric core into the voids of inorganic shell under strong electrostatic attraction. The hollow morphologies of the microspheres were studied under the help of transmission electron microscope and scanning electronic microscope. The formation process of these NHSs could be elucidated using a mechanism similar to the Kirkendall effect. These NHSs were firstly used to produce light diffusion films by blending with polyacrylate latex. The new kind of light diffusion films with micro-nano structure were built by casting the SiO 2 /PMMA NHSs/polyacrylate coatings on optical-grade PET films. The transmittance and haze value of the light diffusion films were tested by a haze meter and application on a LED lamp. As a result, the coating films with NHSs had the best light diffusion properties compared to those films with no spheres or nanocomposite solid microspheres, which indicated that the light diffusion films with NHSs were promisingly applied in LED illumination, photoelectric devices and large area LCD.
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TRIBOLOGY LETTERS
·
2018
·Vol. 66
·期 4
·1-11
·
IF 2.182
Meng Yuan,Su Fenghua,Chen Yangzhi
The nanocomposite of multi-walled carbon nanotube (MWCNT) decorated by nickel nanoparticles (Ni-NPs) was synthesized through a facile chemical reduction in supercritical carbon dioxide (SCCO 2 ) fluid. The spherical nickel nanoparticles were highly dispersed on external wall surfaces of MWCNT with a narrow particle size distribution and had a face-centered cubic crystal structure and an average diameter about 5 nm. Tribological performances of the as-prepared nanocomposite as oil additive were investigated by using a ball-on-disk tribometer. It was found that when the nanocomposite was dispersed into pure mineral oil with an optimum mass concentration of about 0.20 wt%, the friction coefficient and wear rate were reduced by 44.2% and 56.4%, respectively. The mineral oil with the nanocomposite showed better tribological performances than the mineral oil with MWCNT or Ni-NPs alone, which confirmed the synergistic friction-reducing and anti-wear effect of the nanocomposite. Morphologies and chemical compositions of wear surfaces were examined by scanning electron microscopy (SEM), Taylor profilometer and X-ray photoelectron spectroscopy (XPS). Good friction and wear performances of the nanocomposite can be explained by physical deposition films formed on the wear surface and the synergistic effect between the anchored Ni-NPs and MWCNT of the nanocomposite.
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MACROMOLECULAR RESEARCH
·
2018
·Vol. 26
·期 13
·1241-1250
·
IF 1.767
Shen Xiang,Liu Peng,Xu Jiao,Liu Teng,Liu Jianjun,Shen Xianfu,Xia Shubiao,Wang Fan
Membrane technology has been accepted as a very effective approach to purify oily wastewater. However, the serious membrane fouling induced by the adsorption of oily foulants significantly hinders the development of membrane technology in treating oily wastewater. To improve the anti-fouling property and oil/water separation efficiency of membrane, this work reports on the covalent immobilization of short-chain arginine (Arg) molecules onto polyacrylonitrile/polyacrylonitrile- co -poly(glycidyl methacrylate) (PAN/PAN- co -PGMA) blend membrane surface via a ring-opening reaction between epoxy groups and amine groups. It was found that the covalent immobilization of Arg molecules effectively increased the surface hydrophilicity of the membrane, resulting in a significant decrease of the interaction force between the foulants and the membrane surface. This typical characteristic was revealed by the pure water contact angle and the force-extension curve measurements. The Arg-immobilized membranes exhibited much higher separation efficiency against oil/water emulsions than the pristine PAN and PAN/PAN- co -PGMA membranes. Especially when the grafting amount of Arg was 157.3 μg/cm 2 , the oil rejection ratio of an Arg-immobilized membrane was as high as 99.2%. In addition, the flux recovery ratio of the membrane still reached 88.8%, even after two cycle filtrations of pure water and oil/water emulsion. These results indicated that the Arg-immobilized membrane may have practical applications for oil/water emulsion separation.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Li Yongfei,Wang Yanling,Wang Kun,Gomado Foster,Wang Gangxiao,Tang Longhao,Rong Xufeng
The wettability of the formation is critical for the flow back of the fracturing fluid and can further affect the gas production. So it is very necessary to study the wettability of shale reservoir. Here, a novel fluorocarbon surfactant, N-ethyl-N-hydroxyethyl perfluorooctanoamide, was synthesized and characterized by different methods. the contact angles of water and n-decane on the shale increased from 36° and 0° to 121° and 105°, respectively, after treated by N-ethyl-N-hydroxyethyl perfluorooctanoamide (0.5 wt.%). The surface free energy reduced from 72 mN/m to 7.4 mN/m. The results agreed with that of imbibition and capillary tube rise test. Additionally, the analysis of scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of shale surface remarkably increased. These results fully proved that the shale wettability is changed to super gas-wetting. Besides, the thermal analysis revealed that the novel fluorocarbon surfactant has good thermal stability. This indicates that it can be better applied to reservoir modifications at higher temperatures.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 5
·1-9
·
IF 5.705
Han Xiujuan,Meng Zuchao,Zhang Hongfang,Zheng Jianbin
Various carbon nanomaterials for use in anodic stripping voltammetric analysis of Hg(II), Cu(II), Pb(II) and Cd(II) are screened. Graphene, carbon nanotubes, carbon nanofibers and fullerene (C 60 ), dispersed in chitosan (Chit) aqueous solution, are used to modify a glassy carbon electrode (GCE). The fullerene-chitosan modified GCE (C 60 -Chit/GCE) displays superior performance in terms of simultaneous determination of the above ions. The electrodes and materials are characterized by electrochemical impedance spectroscopy, cyclic voltammetry, scanning electron microscopy, Raman spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The excellent performance of C 60 -Chit/GCE is attributed to the good electrical conductivity, large surface area, strong adsorption affinity and unique crystalline structure of C 60 . Using differential pulse anodic stripping voltammetry, the assay has the following features for Hg(II), Cu(II), Pb(II) and Cd(II), respectively: (a) Peak voltages of +0.14, −0.11, −0.58 and − 0.82 V (vs SCE); (b) linear ranges extending from 0.01–6.0 μM, 0.05–6.0 μM, 0.005–6.0 μM and 0.5–9.0 μM; and (c), detection limits (3σ method) of 3 nM (0.6 ppb), 14 nM (0.9 ppb), 1 nM (0.2 ppb) and 21 nM (2.4 ppb). Moreover, the modified GCE is well reproducible and suitable for long-term usage. The method was successfully applied to the simultaneous determination of these ions in spiked foodstuff.
Compared with graphene, carbon nanotubes and carbon nanofibers, an electrode modified with fullerene in chitosan electrode displays superior performance for the simultaneous anodic stripping voltammetric detection of Hg(II), Cu(II), Pb(II) and Cd(II).
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 10
·6041-6053
·
IF 3.809
Yu Qian,Kong Xianming,Ma Yibo,Wang Rui,Liu Qing,Hinestroza Juan P.,Wang Alan X.,Vuorinen Tapani
Abstract Multi-functional cellulose fiber-Au composites were fabricated through a simple and cost-effective procedure by decorating regenerated cellulose fibers with Au nanoparticles. The cellulose fibers were regenerated from waste paper through the Ioncell-F process, an environmental friendly approach. After grafting positive charge, the surface of the cellulose fibers were decorated with citrate-stabilized plasmonic Au nanoparticles (NPs). X-ray photoelectron spectroscopy, scanning electron microscopy, X-ray diffraction, and optical images were used to characterize the regenerated cellulose fibers and fiber-Au NP composites. The fiber-Au composites exhibited different colors as the localized surface plasmon resonance property of Au NPs, which enables visual sensing of the water content in the fiber-Au composites through a colorimetric method. Furthermore, the regenerated cellulose fiber-Au composite was used as an enhanced substrate for the sensing of malachite green via surface-enhanced Raman scattering, in which the limit of detection was lower than 10 ppb. The multi-functional cellulose fibers are potentially suitable for the detection of toxins and the monitoring of water quality. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 26
·26504-26511
·
IF 2.8
Wei Sheng,Wang Fenghe,Chen Yajun,Lan Tao,Zhang Shengtian
Antibiotics and phthalate esters are two kinds of emerging pollutants and are ubiquitous in the aquatic ecosystem. To date, few studies analyzed the combined toxicity of the mixtures of antibiotics and phthalate esters, and their joint toxicity effect mode remains unknown. Here, we investigated the single and joint toxicity of dibutyl phthalate (DBP) and five antibiotics, namely, oxytetracycline hydrochloride (OTC), chlortetracycline hydrochloride (CTC), sulfamethazine (SMZ), sulfamerazine (SMR), and sulfadiazine (SD), to luminescent bacteria of Vibrio fischeri . The median effect concentration (EC 50 ) values of the test chemicals were ranked as CTC (6.67 mg/L) > OTC (25.12 mg/L) > SD (67.61 mg/L) > SMR (141.51 mg/L) > DBP (148.38 mg/L) > SMZ (245.07 mg/L). The joint toxicities of the binary mixtures of antibiotics and DBP were evaluated by the concentration addition (CA) and independent action (IA) models. The joint toxicity effects of CTC-DBP, OTC-DBP, SMZ-DBP, SMR-DBP, and SD-DBP all appeared to be synergism. Our study revealed that sulfonamides combined with DBP could be as toxic as or even more toxic than tetracycline. Thus, the joint toxicity effect should be considered when assessing the ecological risks of binary or multicomponent pollutants.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-6
·
IF 4.122
Fu Feiya,Huang Meiqi,Zhang Weilan,Zhao Yang,Liu Xiangdong
A self-healing polybenzoxazine is synthesized solely based on dynamic ester bonds. For this purpose, an anhydride (succinic anhydride) was added into bisphenol F derived benzoxazine monomer before thermocuring. Owing to the transesterification of newly formed ester bonds, the thermoset network behaves as a thermoplastic at 140 °C in the presence of Zn (Ac) 2 , and shows self-healing properties even after multiple damage-healing cycles. Furthermore, kinetics study indicates that the transesterification is a first-order reaction and the activation energy is about 135.4 kJ/mol. This study proposes a facile and economical way to prepare self-healing polybenzoxazine. It has promising applications in coating, adhesive, and other smart materials that rely on structurally dynamic polymers.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 4
·661-664
·
IF 1.248
Yi Ting,Li Jingwei,Zhang Yibo,Yang Xiangguang
Hollow-ZSM-5 was synthesized by a traditional hydrothermal method without alcohol, and a novel na-no-sized Ce-Cu/hollow ZSM-5 sample was prepared by conventional incipient wetness impreganation. The catalysts were characterized by TEM, SEM, XRD, NMR and N 2 adsorption-desorption. The results indicate that the hollow-ZSM-5 has a good MFI structure with large surface area. The synthesized CeO 2 -CuO/hollow ZSM-5 showed an excellent catalytic activity for NO x conversion(90% NO x conversion were obtained) in the temperature range of 340–550 °C under GHSV=480000 mL·g ‒1 ·h ‒1 due to its appropriate redox ability and acidity.
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危险品化学品经营许可证（带存储）