ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2017
·Vol. 410
·期 2
·573-584
·
IF 3.431
Liu Jiawei,Liang Yixun,Shen Jiwei,Bai Quan
Polymeric ionic liquids (PILs) with 1-vinyl-3-ethylimidazolium cations and two different anions of Br − and PF 6
− were assembled onto the surface of graphene (G) nanosheets. The derived two composites, i.e., PIL(Br)-G and PIL(PF 6 )-G, were further efficiently immobilized onto the surface of silica nanoparticles via self-assembly technique. The obtained two PIL-G/SiO 2 nanocomposites exhibited diverse adsorption performances toward proteins through adjusting the anions of PILs. Electrostatic attractions between proteins and the nanocomposites dominated protein adsorption, while the presence of PF 6
− anions weakened electrostatic interactions and deteriorated the selective adsorption of target protein, i.e., bovine serum albumin (BSA) in this case. Specifically, PIL(Br)-G/SiO 2 nanocomposite displayed high selectivity toward BSA and a high adsorption efficiency of ca. 98% was achieved for 100 mg L −1 BSA in a Britton-Robinson (B-R) buffer at pH 5. HPLC analysis demonstrated the selectivity of PIL(Br)-G/SiO 2 nanocomposite toward BSA in the presence of abundant hemoglobin and cytochrome c. The practical applicability was verified by performing selective isolation of human serum albumin (HSA) from human whole blood.
Selective isolation of human serum albumin from blood by polymeric ionic liquid assembled graphene immobilized silica nanocomposite with tunable anions
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JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2017
·Vol. 90
·期 1
·149-155
·
IF 1.095
Dong Peng,Li Zeyu,Ji Dong,Wang Xiaorui,Yun Hongfei,Du Zhisong,Bian Jie,Li Guixian
Modified Y type catalyst (M-Y) shows great potential for the preparation of toluene attribute to catalyst topology and synergistic effect of Lewis acid and Brönsted acid in the alkylation reaction. However, it still remains a big challenge to build a reaction mechanism. Thereby, based on the study of HZSM-5, H-beta and M-Y catalysts structure and physical properties, a plausible reaction mechanism was proposed. The samples were characterized by X-ray diffraction, N 2 adsorption/desorption, Fourier transform infrared absorption spectra and Pyridine adsorption infrared. The activity of catalysts was tested in benzene alkylation with methanol and was found to be in the following increasing order: Na-Y (no effect) < H-Y << HZSM-5 < H-beta < M-Y.
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Nature Communications
·
2018
·Vol. 9
·期 1
·1-9
·
IF 12.353
Shan Hao,Gao Wenpei,Xiong Yalin,Shi Fenglei,Yan Yucong,Ma Yanling,Shang Wen,Tao Peng,Song Chengyi,Deng Tao,Zhang Hui,Yang Deren,Pan Xiaoqing,Wu Jianbo
Designing new materials and structure to sustain the corrosion during operation requires better understanding on the corrosion dynamics. Observation on how the corrosion proceeds in atomic scale is thus critical. Here, using a liquid cell, we studied the real-time corrosion process of palladium@platinum (Pd@Pt) core-shell nanocubes via transmission electron microscopy (TEM). The results revealed that multiple etching pathways operatively contribute to the morphology evolution during corrosion, including galvanic etching on non-defected sites with slow kinetics and halogen-induced etching at defected sites at faster rates. Corners are the preferential corrosion sites; both etching pathways are mutually restricted during corrosion. Those insights on the interaction of nanostructures with reactive liquid environments can help better engineer the surface structure to improve the stability of electrocatalysts as well as design a new porous structure that may provide more active sites for catalysis.
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-7
·
IF 3.125
Hu Yiwei,Hao Qiaoyan,Zhu Baichuan,Li Biao,Gao Zhan,Wang Yan,Tang Kaibin
Tantalum disulfide nanosheets have attracted great interest due to its electronic properties and device applications. Traditional solution-ased ultrasonic process is limited by ultrasound which may cause the disintegration into submicron-sized flake. Here, an efficient multi-step intercalation and ultrasound-free process has been successfully used to exfoliate 1T-TaS 2 . The obtained TaS 2 nanosheets reveal an average thickness of 3 nm and several micrometers in size. The formation of few-layer TaS 2 nanosheets as well as monolayer TaS 2 sheets is further confirmed by atomic force microscopy images. The few-layer TaS 2 nanosheets remain the 1T structure, whereas monolayer TaS 2 sheets show lattice distortion and may adopt the 1H-like structure with trigonal prism coordination.
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Journal of Analysis and Testing
·
2018
·Vol. 2
·期 1
·69-76
·
IF 0
Zhen Wen-Yao,Bai Jing,Jia Xiao-Dan,Wu Lie,Jiang Xiu-E
The local tumor hypoxia has become one of the main obstacles for photodynamic therapy (PDT).To break through this barrier, the fabrication of O 2 -evolving nanoplatform has been more significant. Herein, the uniform methylene blue (MB)–bovine serum albumin (BSA)–Fe(III) nanoparticles (MB–BSA–Fe(III) NPs) were successfully synthesized by biomineralization approach. MB–BSA–Fe(III) NPs show high loading capacity of MB, and Fe(ΙΙΙ) has excellent catalytic performance towards abundant H 2 O 2 in cancer cells to generate O 2 , overcoming tumor hypoxia. All these combination effects remarkably increase the therapeutic efficiency of PDT, resulting in almost complete destruction of cancer cells. Most importantly, MB–BSA–Fe(III) NPs exhibit T 2- magnetic resonance imaging, which have the potential for precise visualization of the tumor location. Our results demonstrate that MB–BSA–Fe(III) is a novel H 2 O 2 -responsive and O 2 -evolving nanoplatform and it has great potential for clinical applications such as cancer diagnosis, treatment or drug delivery.
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Nature Communications
·
2018
·Vol. 9
·期 1
·1-9
·
IF 12.353
Pei Songfeng,Wei Qinwei,Huang Kun,Cheng Hui-Ming,Ren Wencai
Graphene oxide is highly desired for printing electronics, catalysis, energy storage, separation membranes, biomedicine, and composites. However, the present synthesis methods depend on the reactions of graphite with mixed strong oxidants, which suffer from explosion risk, serious environmental pollution, and long-reaction time up to hundreds of hours. Here, we report a scalable, safe and green method to synthesize graphene oxide with a high yield based on water electrolytic oxidation of graphite. The graphite lattice is fully oxidized within a few seconds in our electrochemical oxidation reaction, and the graphene oxide obtained is similar to those achieved by the present methods. We also discuss the synthesis mechanism and demonstrate continuous and controlled synthesis of graphene oxide and its use for transparent conductive films, strong papers, and ultra-light elastic aerogels.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 36
·期 5
·576-583
·
IF 2.016
Jiang Ru-Jian,Yan Shun-Jie,Tian Li-Mei,Xu Shi-Ai,Xin Zhi-Rong,Luan Shi-Fang,Yin Jing-Hua,Ren Lu-Quan,Zhao Jie
Despite the fact that numerous infection-resistant surfaces have been developed to prevent bacterial colonization and biofilm formation, developing a stable, highly antibacterial and easily produced surface remains a technical challenge. As a crucial structural component of biofilm, extracellular DNA (eDNA) can facilitate initial bacterial adhesion, subsequent development, and final maturation. Inspired by the mechanistic pathways of natural enzymes (deoxyribonuclease), here we report a novel antibacterial surface by employing cerium (Ce(IV)) ion to mimic the DNA-cleavage ability of natural enzymes. In this process, the coordination chemistry of plant polyphenols and metal ions was exploited to create an in situ metal-phenolic film on substrate surfaces. Tannic acid (TA) works as an essential scaffold and Ce(IV) ion acts as both a cross-linker and a destructor of eDNA. The Ce(IV)-TA modified surface exhibited highly enhanced bacteria repellency and biofilm inhibition when compared with those of pristine or Fe(III)-TA modified samples. Moreover, the easily produced coatings showed high stability under physiological conditions and had nontoxicity to cells for prolonged periods of time. This as-prepared DNA-cleavage surface presents versatile and promising performances to combat biomaterial-associated infections.
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-6
·
IF 4.58
Liu Xing-Pei,Xie Xing-Li,Wei Yu-Ping,Mao Chang-jie,Chen Jing-Shuai,Niu He-Lin,Song Ji-Ming,Jin Bao-Kang
A film of perovskite-type LaFeO 3 nanoparticles (NPs) was deposited on fluorine-doped tin oxide (FTO) conducting glass via dipping-lifting and calcination. Scanning electron microscopy shows that the NPs are evenly distributed on the surface of the glass. The modified glass was further coated with antibody against human interleukin 6 (IL-6) to result in a photoelectrochemical immunosensor for IL-6. The well-established photoelectrochemical immunoassay has a linear current response in the range of 0.1 pg·mL −1 to 0.1 μg·mL −1 and a detection limit as low as 33 fg·mL −1 . Schematic of a novel photoelectochemical immunoassay for the measurement of IL-6 based on perovskite-type LaFeO3 nanoparticles. The immunoassay had a higher sensitivity and may also be applied to other bioanalysis and environment monitoring.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 2
·1-12
·
IF 2.127
Ma Lan,He Yi,Luo Pingya,Zhang Liyun,Yu Yalu
Nanoparticles have been known as the useful materials in working fluids for petroleum industry. But the stabilization of nano-scaled materials in water-based working fluids at high salinities is still a big challenge. In this study, we successfully prepared the anionic polymer/multi-walled carbon nanotubes (MWNTs) composites by covalently wrapping of MWNTs with poly (sodium 4-styrenesulfonate) (PSS) to improve the stability of MWNTs in high concentration electrolytes. The PSS/MWNTs composites can automatically disperse in salinity up to 15 wt% NaCl and API brines (8 wt% NaCl + 2 wt% CaCl 2 ). Hydrodynamic diameters of composites were measured as a function of ionic strength and API brines by dynamic light scattering (DLS). By varying the concentration of brines, hydrodynamic diameter of PSS/MWNTs composites in brines fluctuated between 545 ± 110 nm for 14 days and 673 ± 171 nm for 30 days. Above results showed that PSS/MWNTs could be well stable in high salts solutions for a long period of time. After wrapped with PSS, the diameters of nanotubes changed from 30 ~ 40 to ~ 430 nm, the thickness of wrapped polymer is about ~ 400 nm by analysis of morphologies. The zeta potentials of PSS/MWNTs composites in various salinity of brines kept at approximately − 41 ~ − 52 mV. Therefore, the well dispersion of PSS/MWNTs in high salinity is due to large negative charges of poly (sodium 4-styrenesulfonate), which provide enough electrostatic repulsion and steric repulsion to hinder compression of electric double layer caused by high concentration electrolytes.
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-7
·
IF 4.58
Huang Wei,Zhang Ting,Hu Xiaoya,Wang Yang,Wang Jianmin
A porous carbon material doped with an iron species (Fe/PC) was prepared by carbonizing a mixture of zeolitic imidazolate framework-8 in the presence of iron(II) ions. The resulting material was characterized by X-ray diffraction, nitrogen adsorption isotherms, transmission electron microscopy, and by Raman and X-ray photoelectron spectroscopy. Fe/PC was the deposited on the surface of glassy carbon electrode (GCE) to obtain a sensor for amperometric determination of phenolic compounds. The unique catalytic activity, good electrical conductivity and hierarchical structure of the Fe/PC composite results in good electrooxidative activity towards hydroquinone (HQ; typically at 44 mV) and catechol (CC; typically at 160 mV). Under optimal conditions, the amperometric responses are linear in the range from 0.1 to 120 μmol · L −1 for HQ, and from 1.0 to 120 μmol · L −1 for CC. The respective detection limits are 14 and 33 nmol · L −1 . The sensor is highly selective against potential interferents and was successfully applied to the determination of HQ and CC contents in (spiked) water samples.
An amperometric sensor for phenolic compounds was constructed by using a metal-organic framework derived iron doped porous carbon material.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 35
·期 2
·557-566
·
IF 2.007
Sun Zhonghai,Wu Zhansheng,Liu Dandan,He Xiufang
Polycyclic aromatic hydrocarbons (PAHs) are toxic pollutants harmful to humans. To improve the adsorption capacity of PAHs on activated carbon (AC) from the aqueous system, AC was modified with cationic surfactants through microwave heating. Naphthalene is a typical PAH used as a model pollutant to test the adsorption properties of sample; the sample with the best adsorption performance was named SAC. The SAC was characterized by SEM, FTIR and BET in detail compared with AC. The specific surface area and the average pore size of SAC increased by nearly 100 m 2 g −1 and 0.14 nm more than the original AC, respectively. The adsorption experiment was carried out by batch technique with variables such as contact time, adsorbent amount, pH and temperature. Results showed that naphthalene was adsorbed rapidly during the first 20 min, and thereafter reached adsorption equilibrium in 40 min. The adsorption kinetics of naphthalene on SAC can be well described by the pseudo-second-order model and the Freundlich isotherm model better fitted the adsorption isotherms of naphthalene on SAC. Naphthalene adsorption process on SAC was spontaneous and temperature was found to negatively affect the adsorption capacity. Furthermore, film diffusion was confirmed the rate limiting step. The π - π stacking electron donor acceptor interaction, hydrophobic interaction and hydrogen bonding may play more key roles in naphthalene adsorption on SAC than AC. Thus, microwave-assisted surfactants modification was proven to be an effective method to enhance the adsorption of naphthalene onto SAC from aqueous solution.
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-9
·
IF 4.58
Zang Xiaohuan,Chang Qingyun,Liang Weiqian,Wu Tong,Wang Chun,Wang Zhi
A magnetic micro-solid phase extraction method was applied for the extraction of trace levels of various chlorophenols prior to their determination by high performance liquid chromatography. The reduced graphene oxide functionalized with magnetic iron oxide nanoparticles and graphitic carbon nitride was prepared and used as adsorbent. It was characterized by scanning electron microscope, X-ray diffraction and vibrating sample magnetometer. Placed in a polypropylene hollow tube, the material was applied to the extraction of 3-chlorophenol, 2,3-dichlorophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol in cosmetic samples. Several experimental parameters that affect extraction efficiency were optimized. Following desorption with alkaline methanol, the chlorophenols were quantified by high performance liquid chromatography. A linear response was observed in the 1.0–200 μg·kg −1 CP concentration ranges. The detection limits (at a signal-to-noise ratio of 3) are between 0.20 and 0.30 μg·kg −1 . The relative recoveries of the CPs from spiked cosmetics samples were in the range from 80.5 to 104%, with relative standard deviations lower than 12%. The filled extraction tube is high durable and stable. It can be used for 120 extraction cycles without a significant loss of extraction efficiency. The good adsorption ability of the sorbent was attributed to the strong π stacking interaction between the graphitic carbon nitride functionalized reduced graphene oxide and the aromatic rings in the CPs.
A magnetic micro-solid phase extraction (M-μSPE) method was applied to the extraction of various trace chlorophenols prior to their determination by high performance liquid chromatography. The M-μSPE method combines the advantages of both MSPE and μSPE.
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