RSC Advances
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2017
·Vol. 7
·期 20
·12247-12254
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IF 3.108
Xuan Zhou,Xinshuo Zhang,Jianjun Zhou,Lin Li
6-Deoxy-6-(2-aminoethyl) amino chitosan (CS-AEA) and aminoethyl modified CS-AEA (CS-AEA-AEM) were synthesized and characterized using FTIR, NMR and elemental analysis. The results showed that the expected CS derivatives were obtained, and the amine group content increased successively in CS, CS-AEA and CS-AEA-AEM. The red blood cell (RBC) agglutination behaviors in solutions of CS and its derivatives were studied using optical microscopy (OM) and ultraviolet-visible (UV-Vis) spectrophotometry. The results demonstrated that the agglutination of RBCs became more evident upon decreasing the pH value and increasing the concentration. Although CS-AEA-AEM had the highest content of amine groups, CS-AEA exhibited the best agglutination performance under the pH and concentration range studied. Potentiometric titration and ionization degree calculations showed that the agglutination behavior of RBCs was determined by the number of protonated amines in CS or its derivatives. Hemocompatibility tests showed that the hemolysis of CS derivatives increased after modification, and the CS derivatives could be classified as a slightly hemolytic material. We have sucessfully developed a CS derivative (CS-AEA) with very good RBC agglutination performance under neutral conditions.
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ACS Catalysis
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2017
·
IF 10.614
Chaofeng Zhang,Hongji Li,Jianmin Lu,Xiaochen Zhang,Katherine E. MacArthur,Marc Heggen,Feng Wang
For lignin valorization, simultaneously achieving the efficient cleavage of ether bonds and restraining the condensation of the formed fragments represents a challenge thus far. Herein, we report a two-step oxidation–hydrogenation strategy to achieve this goal. In the oxidation step, the O2/NaNO2/DDQ/NHPI system selectively oxidizes CαH–OH to Cα═O within the β-O-4 structure. In the subsequent hydrogenation step, the α-O-4 and the preoxidized β-O-4 structures are further hydrogenated over a NiMo sulfide catalyst, leading to the cleavage of Cβ–OPh and Cα–OPh bonds. Besides the transformation of lignin model compounds, the yield of phenolic monomers from birch wood is up to 32% by using this two-step strategy. The preoxidation of CαH–OH to Cα═O not only weakens the Cβ–OPh ether bond but also avoids the condensation reactions caused by the presence of Cα+ from dehydroxylation of CαH–OH. Furthermore, the NiMo sulfide prefers to catalyze the hydrogenative cleavage of the Cβ–OPh bond connecting with a Cα═O rather than catalyze the hydrogenation of Cα═O back to the original CαH–OH, which further ensures and utilizes the advantages of preoxidation.
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ENERGY
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2016
·
IF 4.292
Xiao Cheng,Rong Chen,Xun Zhu,Qiang Liao,Liang An,Dingding Ye,Xuefeng He,Shuzhe Li,Lin Li
The development of highly efficient photocatalytic reactor is of importance to improve the performance of the photocatalytic reduction of CO 2 . In this work, an optofluidic planar microreactor is designed and fabricated for the photocatalytic reduction of CO 2 with liquid water in alkaline environment . Such design offers several advantages of large surface-area-to-volume ratio, enhanced mass and photon transfer and more uniform light distribution. The performance of the developed planar microreactor is evaluated by measuring the methanol concentration to estimate the methanol yield under various operating parameters, including the liquid flow rate , light intensity, catalyst loading and NaOH concentration. It is shown that increasing the liquid flow rate firstly improves and then decreases the methanol concentration while the methanol yield continuously increases as the liquid flow rate increases. The increase of the light intensity and NaOH concentration increases both the methanol concentration and yield. Increasing the catalyst loading firstly improves the performance and then results in the reduction of the performance. A maximum methanol yield of 454.6 μmole/g-cat·h is achieved under a liquid flow rate of 50 μL/min, 0.2 M NaOH, and the light intensity of 8 mW/cm 2 .
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RSC Advances
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2017
·Vol. 7
·期 5
·3003-3011
·
IF 3.108
Songlv Qin,Cheng Chen,Mingjun Cui,Afang Zhang,Haichao Zhao,Liping Wang
In this study, to achieve a compatible and good dispersion of graphene in polyimide matrix, we synthesized an aromatic diamine, aniline trimer, as a polymerizable graphene dispersant. Polyimide/graphene nanocomposites with 0.25–2% mass fraction of graphene were prepared by in situ condensation of pyromellitic dianhydride, 4,4′-oxydianiline, and aniline trimer (AT) functionalized graphene in DMAc, following subsequent thermal imidization at elevated temperatures. UV-vis and Raman spectroscopy verified the π–π interactions between AT and graphene. The microstructure analysis using XRD, SEM, and TEM were performed to investigate the morphology of graphene in the polyimide matrix. The thermal, mechanical, and tribological properties of polyimide/graphene nanocomposites were investigated by TGA, DMA, and friction and wear tests. In view of the ease of preparation and their superior physical properties over neat polyimide, PI/G composites prepared in this study showed promising applications as wear-resistant and self-lubricating materials.
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NEW CARBON MATERIALS
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2016
·
IF 0.993
Li-le Liu,K P Annamalai,You-sheng Tao
A CuCo 2 S 4 /graphene composite was synthesized using a simple hydrothermal method. The sample was characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, nitrogen adsorption and electrochemical tests. The composite had a hierarchical porous structure with micropores of 0.7-1.2 nm, mesopores of 2-10 nm and a total pore volume of 0.1 cm 3· g −1 , and the CuCo 2 S 4 had a nano-belt structure. As the electrode of a supercapacitor the composite showed a high specific capacitance of 665 F/g at 7.5 mV/s, and excellent rate capability and cycling stability.
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TALANTA
·
2016
·
IF 4.035
Shuo Duan,Rui Yue,Yuming Huang
For the first time, polyethylenimine (PEI) and carbon nanotubes (CNT) composites (PEI-CNTs) were employed for investigation of electrochemical response of silver nanoparticles (AgNPs) in this work. The PEI-CNTs were easily prepared by sonicating the mixture of PEI and CNTs solution and characterized by SEM, Raman and electrochemical impedance spectroscopy (EIS). The PEI-CNTs/GCE enhanced the electrochemical response for three AgNPs with different capping agents, including citrate-AgNPs (Cit-AgNPs), humic acid-AgNPs (HA-AgNPs) and gum acacia-AgNPs (GA-AgNPs), by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronocoulometry (CC). On these findings, a new electrochemical method based on LSV was developed for the detection of AgNPs. Under the optimum conditions, the proposed method showed a good linear range from 5 to 200 ng/L, and the limits of detection (LODs) were 4.77 ng/L for Cit-AgNPs, 2.48 ng/L for HA-AgNPs and 1.01 ng/L for GA-AgNPs, respectively. The potential of using the PEI-CNTs modified GCE for determining AgNPs in water samples has been successfully demonstrated.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Yu Liu,Weidong Chi,Donglin Zhao,Hui Liu,Yu Deng
The molecular-cage method is a convenient and universal way of synthesizing nanoparticles in aqueous phase. In this paper, hydroxyapatite (HA) and zirconium hydroxide nanoparticles are made by the molecular-cage method with a hydroxyl-rich solute. The structure, morphology, and particle size of the product were analyzed by differential scanning calorimetry and scanning electron microscopy. The chemical structures of the particles are not affected by the molecular-cage effect. The sizes of the nanoparticles and the concentration of the solute have a corresponding relationship in a limited range. The higher the concentration of the solute, the smaller the nanoparticles. Besides, HA nanoparticles are also made by the molecular-cage method in a water/ethanol mixture.
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RSC Advances
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2016
·Vol. 6
·期 76
·71963-71969
·
IF 3.289
Yimeng Zhang,Pengyao Xing,Minmin Yang,Yajie Wang,Bo Wang,Aiyou Hao,Mingfang Ma
Anthracen-9-ylmethyl octadecylcarbamate (A-9-YMOC) contains an anthracen headgroup, an imide group, and a long alkyl chain, which could show π–π stacking, hydrogen-bonding, and van der Waals interactions, respectively. The capability of A-9-YMOC to form well-ordered micro/nanostructures in different solvents was explored. And the influence of solvents with various polarities that can modulate the self-assembly behavior, including H-bond-forming solvents, π-stacking-forming solvents or van der Waals-type solvents was studied. In addition, different supramolecular architectures, including nanofibers and nanoflowers were observed during the solvent-polarity-tuned process, which were found to have different molecular arrangements. This work may provide a facile method to manipulate the morphology and properties of self-assembled low-molecular-weight organic building blocks.
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CHEMICAL PHYSICS LETTERS
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2017
·
IF 1.815
Shaopeng Qi,Bo Zhao,Bo Zhou,Xiaoqing Jiang
A new electrochemical immunosensor for fast determination of ractopamine (RAC) is fabricated based on pristine graphene (PG). The PG provides a microenvironment beneficial the immobilization of RAC, promotes the electron transfer, and raises the sensitivity of the immunosensor. The free RAC in solution can be effectively measured based on the competitive immunoreaction between RAC-antibody and RAC. The calibration graph shows linearity over the concentration ranges of 0.1–10 and 10–4000 ng mL −1 . The proposed immunosensor displays a satisfactory stability, selectivity, and reproducibility and has been applied to the quantificational detection of RAC in real pork samples.
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Scientific Reports
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2016
·Vol. 6
·期 1
·1-8
·
IF 5.228
Zhou Zhengnan,Li Weiping,He Tianrui,Qian Lei,Tan Guoxin,Ning Chengyun
To enhance the surface bioactivity of titanium (Ti) prostheses, an electroactive polyvinylidene fluoride (PVDF) film was prepared on a Ti substrate to provide a mimetic of the electrical microenvironment, which facilitated the performance of cell functions. The results of cell proliferation and differentiation assays indicated that polarization of the PVDF-Ti (PTi) altered its surface charge, thus inducing adhesion, proliferation and osteogenic differentiation of cells. The polarized PVDF-Ti (PPTi) may therefore find applications in bone regeneration.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2017
·
IF 3.454
Heping Li,Zhiqiang Ke,Jing Li,Lihong Xue,Youwei Yan
Pores and cracks are usually inevitable in the coatings fabricated by plasma spraying . Herein, thermal chemical reaction technique was developed as an effective low-temperature strategy for addressing this issue. Dense α-Al 2 O 3 /AlPO 4 coating was synthesized on the surface of the plasma sprayed Al 2 O 3 -based coating by thermal chemical reaction at 500 °C. The α-Al 2 O 3 /AlPO 4 composites permeated into the coating and effectively filled up the pores and cracks inside. The sealed coating showed a uniform and dense morphology. The hydrogen permeation rate of the sealed coating sharply decreased by a factor of 15, which further confirmed its significantly improved compactness. In addition, the coating exhibited good thermal shock resistance and bond strength after sealing. Considering its low-temperature heat treatment, facile fabrication process and wide applicability, thermal chemical reaction method can be potentially used as a cost-saving strategy for sealing plasma sprayed ceramic coatings .
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Journal of Physical Chemistry C
·
2017
·
IF 4.536
Wei-Long Xu,Meng-Si Niu,Xiao-Yu Yang,Peng-Qing Bi,Kang-Ning Zhang,Chao Xiong,Hong-Chun Yuan,Trevor A. Smith,Kenneth P. Ghiggino,Xiao-Tao Hao
Perovskite microplates have important implications in the fields of functional electronics and optoelectronics. We report a facile strategy, antisolvent treatment for the growth of perovskite microplates. The morphology and crystalline quality of the microplates could be controlled by the amount of the chlorobenzene antisolvent used. An appropriate amount of antisolvent facilitates the formation of high-quality perovskite microplates with no residual precursor remaining. Spatially and temporally resolved fluorescence measurements demonstrate the heterogeneity of defect-state density and recombination processes in various perovskite microplate regions. The body center shows higher defect state density when compared with that at the edge or the corner of the microplate. Excessive antisolvent degrades the microplates into smaller particles. The results of this study reveal the factors that influence the crystallization process and photophysical dynamics of perovskite microplates.
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