JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 8
·4460-4471
·
IF 2.599
Chen Zhou,Dong Yunyun,Jiang Shaoyang,Song Wenjing,Lai Weikun,Yi Xiaodong,Fang Weiping
Hierarchical SAPO-11 was successfully synthesized without a secondary template by changing the hydrothermal crystallization temperature. SAPO-11 with a larger external surface area, more acidity, and a large number of external active sites was constructed through a novel two-step crystallization strategy. Both precrystallization step and the low-temperature crystallization step were confirmed to be indispensable conditions for constructing hierarchical SAPO-11. After loading Pt nanoparticles by incipient wetness impregnation, the heptane hydroisomerizations based on 0.5 wt% Pt/C-SAPO-11-200 and 0.5 wt% Pt/T-SAPO-11-120 catalysts were carried out in a fixed-bed at a total pressure of 1.5 MPa with a H 2 /n-heptane volumetric of 400 and WHSV = 10 h −1 . A conversion level of 75.7% of 0.5 wt% Pt/T-SAPO-11-120 catalyst was reached, which was higher than that of 0.5 wt% Pt/C-SAPO-11-200 catalyst (64.3%) at 300 °C. The enhanced performance achieved was attributed to the improved effect of the support, in terms of not only better mass transport and higher number of exposure active sites but also improved dispersity and decrease in the size of Pt particles.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 3
·855-861
·
IF 4.58
Huang Yaxun,Tang Chen,Liu Jin,Cheng Jun,Si Zhongzhou,Li Ting,Yang Minghui
The authors describe a strategy for improving the sensitivity of electrochemical immunoassays that is based on the use of hydroxyapatite nanoparticles (HAP-NPs). Signal generation is based on the reaction of phosphate groups present in HAP-NPs with molybdate to form a redox-active molybdophosphate precipitate on the surface of the electrode that facilitates the generation of an electrochemical current. The cancer biomarker α-fetoprotein (AFP) was chosen as a model antigen (analyte). Antibodies against AFP (Ab 2 ) were immobilized on the HAP-NPs to obtain the signal probe. The reaction of HAP-NPs with molybdate and the performance of the immunoelectrode were characterized in detail. Based on this signal amplification approach, an immunoassay was worked out that has a linear range that extends from 0.1 pg·mL −1 to 1 ng·mL −1 and a detection limit as low as 50 fg·mL −1 . The assay was successfully applied to the determination of AFP in serum samples. In our perception, this new signal amplification scheme can be adapted to numerous other immunoassays.
Schematic of the electrochemical assay for the cancer biomarker α-fetoprotein based on hydroxyapatite (HAP) nanoparticles as signal probe. The reaction of HAP nanoparticles with molybdate leads to the formation of a redox-active molybdophosphate precipitate on the electrode surface and generates an electrochemical current.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 3
·446-454
·
IF 1.692
Chen Bin,Chen Jia,Li Jing-yu,Tong Xin,Zhao Hai-chao,Wang Li-ping
A critical challenge for initiating many applications of the carbon nanotubes (CNTs) is their dispersion in organic solvent or in polymer melt. In the present study, we described a novel strategy for fabricating carbon nanotubes (CNTs)-reinforced epoxy nanocomposite by utilizing aniline trimer (AT) as the noncovalent dispersant. Tensile testing showed that the tensile modulus of the CNTs-reinforced epoxy composites was considerably improved by adding a small amount of AT functionalized CNTs. Additionally, the as-prepared CNTs-epoxy nanocomposites exhibited superior tribological properties with much lower frictional coefficients and wear rates compared to those of neat epoxy resin. The well dispersed AT-functionalized CNTs in epoxy matrix played an important role in enhancing the mechanical properties, as well as acting as a solid lubricant for improving the tribological performance of epoxy/CNTs nanocomposite.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 9
·5155-5164
·
IF 2.599
Wang Mingjie,Shen Shuling,Li Long,Tang Zhihong,Yang Junhe
The effect of sacrificial reagents (SRs) on photocatalytic H 2 evolution rate over different photocatalysts was systematically studied. Zn 0.5 Cd 0.5 S, graphitic carbon nitride (g-C 3 N 4 ), and TiO 2 were chosen as typical photocatalysts, while alcohols, amines, carboxylic acids, and inorganic Na 2 S/Na 2 SO 3 were chosen as SRs. The results indicate that Na 2 S/Na 2 SO 3 , methanol, and triethanolamine are the most suitable SRs for Zn 0.5 Cd 0.5 S, TiO 2 , and g-C 3 N 4 , respectively. It was found that in selecting organic SRs, both the permittivity and oxidation potential have profound effects on the H 2 production efficiency, which will provide basis for choosing appropriate SRs for different photocatalysts.
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Cai Sheng,Zhu Dongliang,Zou Yan,Zhao Jing
A series of porous polymers bearing functional quaternary ammonium salts were solvothermally synthesized through the free radical copolymerization of divinylbenzene (DVB) and functionalized quaternary ammonium salts. The obtained polymers feature highly cross-linked matrices, large surface areas, and abundant halogen anions. These polymers were evaluated as heterogeneous catalysts for the synthesis of cyclic carbonates from epoxides and CO 2 in the absence of co-catalysts and solvents. The results revealed that the synergistic effect between the functional hydroxyl groups and the halide anion Br − afforded excellent catalytic activity to cyclic carbonates. In addition, the catalyst can be easily recovered and reused for at least five cycles without significant loss in activity.
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PubMed
高影响因子
CELLULOSE
·
2016
·Vol. 23
·期 4
·2475-2485
·
IF 3.195
Gao Ruifang,Chen Xiao,Chen Chuntao,Shi Rui,Ouyang Fuzhong,Yang Jiazhi,Sun Dongping,Liu Jian
Along with advances in life science and clinical research, there has been an increasing interest in enrichment technologies for proteins with post-translational modifications. Here we report a new platform to enrich and detect phosphopeptides using the hybrid nanofibers synthesized from bacterial cellulose (BC). Hydrothermal reactions have successfully been employed to synthesize BC@mTiO 2 hybrid nanofibers. The morphology of the hybrid nanofibers has been characterized in detail. They are featured with tremendously increased specific surface areas and appropriate pore size for adsorption of phosphopeptides with high efficiency. The BC@mTiO 2 tips allow improving both the sensitivity and selectivity of mass spectrometry by nearly two orders of magnitude compared with the commercial tips. As a robust and highly cost-effective platform, our approach has provided a nanotechnology invention to enrich and detect phosphorylated proteins with important biomedical applications.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·3721-3728
·
IF 4.58
Yin Dan,Tao Yiyi,Tang Lan,Li Wei,Zhang Zhang,Li Junlong,Xie Guoming
The authors describe a dual-signal electrochemical biosensor for highly sensitive determination of the HIV-1 related gene. This method is based on the application of cascaded toehold-mediated strand displacement reactions (TMSDRs) in combination with non-enzymatic target recycling amplification (TRA). A DNA machine with two TMSDRs was designed, and this resulted in reusable target and an output of two oligonucleotides, referred to as strand A (AS) labeled with the redox tag methylene blue (MB) and as untagged strand B (BS). A ferrocene (Fc)-modified signal probe (Fc-P 1 ) is immobilized on the gold electrode surface by hybridizing with a thiolated probe (P 2 ). The labeled AS causes the dissociation of Fc molecules and the gathering of MB molecules via strand displacement reaction. The target gene triggers TMSDRs and TRA. This leads to an increase in the distance changes between the redox tags and the gold electrode. The assay works in the 1 pM to 10 nM concentration range. On account of target recycling and dual recognition, the limit of detection is as low as 0.88 pM (at an S/N ratio of 3). The assay also has a remarkable selectivity which is ascribed to the use of both cascaded TMSDRs and dual recognition. In our perception, this assay represents a robust means of wide scope in that it may be applied to the detection of various kinds of nucleic acid even in complex samples.
Schematic of a dual-signal electrochemical biosensor based on cascaded toehold-mediated strand displacement and non-enzymatic target recycling amplification strategy for the HIV-1 related gene detection. Two electroactive molecules are used to produce electrochemical signals in this “signal-on/off” sensing system.
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CHEMICAL PAPERS
·
2017
·Vol. 71
·期 7
·1249-1254
·
IF 1.258
Pan Dong-Hui,Wang Tong-Zhen,Xiao Guo-Min
A fast, mild, and practical microwave-assisted protocol for synthesis of 1,4-bis(difluoromethyl)benzene from 1,4-bis(dichloromethyl)benzene and KF was developed. The new protocol increased the yield and reduced the reaction time significantly in contrast to the conventional heating procedure. Also, the synergistic effect of a composite phase transfer catalyst was studied.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2016
·Vol. 311
·期 3
·1577-1591
·
IF 0.983
Zong Youli,Zhang Yongde,Lin Xiaoyan,Ye Dong,Luo Xuegang,Wang Jing
A novel microsphere adsorbent based upon carboxymethyl cellulose sodium/prussian blue composite loaded with Lanthanum(III) (CMC/PB-La) was successfully synthesized via electrostatic ejection device for removal of cesium from contaminated water, and characterized by FT-IR, SEM, EDX and XPS. Influencing factors to adsorption cesium were investigated, including solution pH, adsorbent dosage, contact time, initial concentration, temperature and competing ions. Linear Freundlich isotherm was fitted satisfactorily to the adsorption data, and the adsorption kinetic data was fitted well with pseudo-second-order model. Moreover, the results of γ-irradiation experiments indicate that CMC/PB-La has good radiation stability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 20
·20672-20679
·
IF 2.76
Chen Xiao,Li Hongbing,Liu Xiaoyan,Zhang Xinying,Liang Xia,He Chiquan,Cao Liya
The in situ chemical oxidation technology (ISCO) and phytoremediation for PAHs have been studied respectively, but few focus on the feasibility of combining persulfate with ryegrass. This literature revealed the effect of persulfate oxidation on the growth of ryegrass and the removal ratios of pyrene in the couple system of persulfate oxidation and phytoremediation. The results demonstrated that half of pyrene in test soil was oxidized by persulfate in 7 days and then the residual pyrene concentration was decreased to a lower level by ryegrass in the following 2 months in oxidation treatment and drip washing and plants (OWP) and oxidation treatment and drip washing and plants and fertilization (OWFP) treatment. Ryegrass could grow well after persulfate oxidation with the oxidized soil washed by water. Ryegrass in OWP and OWFP treatments had higher ratios of overground and underground biomass. However, the seeds of ryegrass cannot germinate when drip washing was omitted. Pyrene together with residual persulfate changed soil enzyme activities. Drip washing and the growth of ryegrass made soil enzyme activities tend to returned to normal levels. Persulfate oxidation and phytoremediation were compatible to make contributions to the dissipation of pyrene. Persulfate oxidation activated by heat had higher removal efficiency of PAHs and phytoremediation could further decrease the pyrene concentration in spiked soil.
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PubMed
高影响因子
Nano Research
·
2016
·Vol. 9
·期 10
·2960-2971
·
IF 8.893
Peng Haitao,Sun Weihai,Li Yunlong,Ye Senyun,Rao Haixia,Yan Weibo,Zhou Huanping,Bian Zuqiang,Huang Chunhui
An inverted planar heterojunction perovskite solar cell (PSC) is one of the most competitive photovoltaic devices exhibiting a high power conversion efficiency (PCE) and nearly free hysteresis in the voltage–current output. However, the band alignment between the transport materials and the perovskite absorber has not been optimized, resulting in a lower open-circuit voltage ( V
oc ) than that of regular PSCs. To address this issue, we tune the band alignment in perovskite photovoltaic architecture by introducing bilayer structured transport materials, e.g., the hole transport material poly(ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/V 2 O 5 . In this study, solution processed inorganic V 2 O
x
interlayer is incorporated into PEDOT:PSS for achieving improved film surface properties as well as optical and electrical properties. For example, the work function (WF) was changed from 5.1 to 5.4 eV. A remarkably high PCE of 17.5% with nearly free hysteresis and a stabilized efficiency of 17.1% have been achieved. Electronic impedance spectra (EIS) demonstrate a significant increase in the recombination resistance after introducing the interlayer, associated with the high V
oc output value of 1.05 V. Transient photocurrent and photovoltage measurements indicate that a comparable charge transport process and an inhibited recombination process occur in the PSC with the introduction of the V 2 O
x
interlayer.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 21
·9625-9637
·
IF 2.302
Huang Qiang,Liu Meiying,Guo Ren,Mao Liucheng,Wan Qing,Zeng Guangjian,Huang Hongye,Deng Fengjie,Zhang Xiaoyong,Wei Yen
In this study, a facile surface functionalization method was applied to synthesize poly-levodopa (PDOPA)-modified silica nanocomposites (denoted as SiO 2 -PDOPA). The adsorption capacity of SiO 2 -PDOPA was found to be higher than that of unmodified SiO 2 NPs. The successful preparation of SiO 2 -PDOPA was confirmed by Fourier transform infrared spectroscopy, transmission electron microscopy, and thermo gravimetric analysis. The adsorption behavior was investigated using SiO 2 -PDOPA as adsorbents and Cu 2+ as a model heavy metal pollutant. Various adsorption parameters, including contact time, solution pH, temperature, and initial Cu 2+ concentrations were studied. The results showed that pH could markedly affect the adsorption process of SiO 2 -PDOPA to Cu 2+ . The optimum pH for Cu 2+ adsorption was found to be 7.0. The adsorption kinetic data were analyzed using pseudofirst-order, pseudosecond-order, and intraparticle diffusion
models. The adsorption isotherms could be described by Langmuir and Freundlich isotherm models. The fitting
results showed that the adsorption kinetics and isotherms were better
described by the pseudosecond-order and Langmuir model, respectively. The values of thermodynamics constants, including entropy change (Δ S
0 ), enthalpy change (Δ H
0 ), and Gibbs free energy (Δ G
0 ) were determined at different temperatures. Results suggested that the adsorption
process of SiO 2 -PDOPA to Cu 2+ is a feasible, endothermic, and spontaneous process.
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