JOURNAL OF NANOPARTICLE RESEARCH
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2017
·Vol. 19
·期 9
·1-10
·
IF 2.02
Hu Xiaoming,Li Lihua,Lu Yao,Liu Cong,Lei Yangqing,Zhang Chengcheng,Yin Qingshui,Zhang Yu
Photothermal therapy (PTT) has attracted great attention in cancer therapy because of high efficiency and low side effect. The semiconductors have been proved to be ideal photothermal agents in the past years. Herein, we synthesized a novel hexahedron structure of polyvinyl pyrrolidone (PVP) coating CuS nanocrystals (NCs) by a facile hydrothermal method. The synthesized CuS NCs (150 nm for average length of edge and 125 nm for length of width) have good biocompatibility due to their PVP coating and strong absorption in the near infrared region. Moreover, the CuS NCs exhibit high photothermal conversion efficiency as well as good antibacterial effect. Notably, the proliferation of osteosarcoma cancer cells can be efficiently inhibited both in vitro and in vivo by the fatal heat with very low concentration of CuS NCs under the near infrared ray at a power density of 0.5 W/cm 2 . Therefore, the CuS-PVP NCs have great potential to work as an ideal photothermal and antibacterial agent in clinical applications.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 27
·21591-21600
·
IF 2.741
Wang Tiecheng,Li Yujuan,Qu Guangzhou,Sun Qiuhong,Liang Dongli,Hu Shibin,Zhu Lingyan
Surface discharge plasma (SDP) combined with activated carbon (AC) was employed to eliminate dissolved organic matter from micro-polluted source water, with humic acid (HA) as the model pollutant. Synergistic effect on HA removal was observed in the SDP-AC system; HA removal efficiency reached 60.9% within 5-min treatment in the SDP-AC system with 5.0 g AC addition, whereas 16.7 and 17.4% of HA were removed in sole SDP system and AC adsorption, respectively. Scanning electron microscope and Boehm titration analysis showed that chemical reactions between active species and functional groups of AC occurred. The existence of isopropanol or benzoquinone exhibited inhibitive effects on HA removal in the SDP system, while these inhibitive effects were weakened in the SDP-AC system. The influences of AC on ozone equivalent concentration and H 2 O 2 concentration were evaluated, and there were approximately 39 and 20% decline in ozone equivalent concentration and H 2 O 2 concentration within 6-min treatment in the SDP-AC system, respectively, compared with those in the sole SDP system. Dissolved organic carbon, specific ultraviolet absorbance, and UV absorption ratios analysis demonstrated that the SDP treatment destroyed the chromophoric groups, double bonds, and aromatic structure of HA molecules, and these destructive actions were strengthened by AC.
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PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2017
·Vol. 20
·期 4
·765-775
·
IF 1.45
Zhitian Liu,Yifan Ge,Qi Zhang,Xiang Gao,Xiong Cai,Mengyao Chen,Xuechen Yu
A series of novel cationic gemini surfactants p -phenylenedimethylene bis(alkyldiethylammonium) chloride (abbreviated as G m , m is the carbon numbers of hydrophobic tails) were synthesized. Their surface properties and aggregation behavior were investigated by surface tension, electrical conductivity, steady-state fluorescence, dynamic light scattering and transmission electron microscopy measurements, and compared with gemini surfactants with a flexible hexanediyl spacer and diethylammonium headgroups [abbreviated as C m C 6 C m (Et)]. It was found that G m reached adsorption equilibrium at the air–water interface at the critical micelle concentration, but C m C 6 C m (Et) did not. The packing densities and the aggregation surface charge densities of G m are less than that of C m C 6 C m (Et). Pre-micellar association occurs in aqueous solutions of gemini surfactants with m ≥ 14. The ability to form pre-micellar aggregates increases with increasing the length of alkyl chain. Gemini surfactants with rigid p -xylylene spacer are more prone to form the pre-micellar aggregates. The rigidity of the spacer of gemini surfactants has little effect on the aggregation micropolarity sensed by pyrene. Only vesicles were found in aqueous solutions of these gemini surfactants, and G m with p -xylylene spacer tends to form larger vesicles which have loose structures with low surface charge density.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2017
·Vol. 21
·期 10
·2887-2898
·
IF 2.316
Ouyang Ruizhuo,Zong Tianyu,Su Yongfu,Jia Pengpeng,Zhou Shuang,Yang Yang,Feng Kai,Chang Haizhou,Chen Ying,Zhao Yuefeng,Xiong Fei,Miao Yuqing
A new type of Ni 2+ -loaded MWCNT composite was prepared by mixing carboxylated multiwalled carbon nanotubes (MWCNTs) and Ni 2+ ions and allowing them to interact electrostatically. The resulting composite was subsequently used as an electrocatalyst for glucose (Glu) oxidation. Compared with electrodes modified through the addition of free Ni 2+ ions or MWCNTs, the Ni 2+ /MWCNT composite electrode showed greatly improved properties such as hydrophilicity. Investigations of the Ni 2+ /MWCNT composite electrode via inductively coupled plasma atomic emission spectroscopy and nitrogen adsorption–desorption isotherms verified that Ni 2+ ions had been adsorbed onto the surfaces of the MWCNTs in the composite. As expected, a Ni 2+ /MWCNT composite-based sensor showed extraordinary electrocatalytic performance in Glu oxidation. In the concentration range 0–4.3 mM, a good linear relationship between the Glu added and the current generated was observed, with a correlation coefficient ( R
2 ) of 0.9988. The detection limit and sensitivity were calculated to be 0.081 μM and 2285 μA mM −1 cm −2 , respectively. Finally, the new method was successfully applied to determine the Glu in a human blood sample. Recoveries of >100%, indicative of high reliability, accuracy, and precision, were obtained.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 4
·1185-1190
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IF 4.58
Gong Lingling,Du Bibai,Pan Long,Liu Qingju,Yang Kunhao,Wang Wei,Zhao Hong,Wu Li,He Yujian
The authors describe a colorimetric assay for the determination of As(III) in aqueous solution using citrate capped gold nanoparticles (AuNPs) which, in the presence of As(III), undergo aggregation due to the interaction of citrate ion with As(III). This results in an easily detectable color change from wine-red to blue. The ratio of the absorbances at 661 and 519 nm is linearly related to the As(III) concentration in the 4 to 100 ppb range, with a detection limit as low as 1.8 ppb (at 3σ) which is below the guideline value of 10 ppb. The method is rather simple in that it does not require the surface of the AuNPs to be modified. It was successfully applied to the determination of As(III) in spiked drinking water where it gave adequate recoveries.
The ratio of the absorbances at 661 and 519 nm is linearly related to the As(III) concentration in the 4 to 100 ppb range, with a detection limit as low as 1.8 ppb (at 3σ) which is below the guideline value of 10 ppb.
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高影响因子
RARE METALS
·
2017
·Vol. 37
·期 2
·148-153
·
IF 1.189
Jin Hui,Wang Yi-Yong,Wang Yu-Ting,Yang Hong-Bing
Current machinery requires metallic materials to have better surface properties. Based on an orthogonal experimental design and analysis method, the CeO 2 -reinforced nickel nano-composite coatings were prepared by direct current electrodeposition in a nickel sulfate bath containing CeO 2 nanoparticles. Statistical results indicate that current density is the most significant variable in the electrodeposition processing, while temperature is the least important factor. The microstructure of Ni and Ni–CeO 2 nano-composite coatings was characterized by scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The microhardness of the Ni coating is enhanced by the incorporation of CeO 2 nanoparticles. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to characterize the corrosion behavior of Ni and Ni–CeO 2 coatings. These studies show that Ni–CeO 2 coating has better corrosion resistance compared to Ni coating.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 10
·6081-6092
·
IF 2.599
Han Sheng,Chang Xing,Wu Dongqing,Chen Hongyan,Chen Daming,Liu Ping,Huang Tao,Jiang Xinze,Huang Qi,Lin Hualin
A facile and cost-efficient synthesis approach toward hierarchically porous cobalt aluminum layered double hydroxide with hydrangea flower-like morphology (PCALs) is developed in this work via the hydrothermal treatment of cobalt- and aluminum-containing precursors under basic conditions following etching with NaOH. The architectures and porosities of the obtained PCALs can be easily modified by the fabrication conditions such as the concentration of the starting materials and the time of etching, which can further influence their electrochemical behavior. As the electrode material in a three-electrode supercapacitor, the PCALs can deliver a high capacitance of 550 F g −1 for 1000 cycles with a retention rate over 82% at 10 A g −1 . In addition, the asymmetric capacitor using PCALs as cathode and active carbon as anode also exhibits an excellent capacitance of 103.5 F g −1 at 0.5 A g −1 , indicating their potentials in the applications of energy storages.
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JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 5
·1133-1141
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IF 1.385
Xu Feigao,Liu Heng,Li Dan
Xerogels’ formation in the hydrolysis and condensation reaction of tetraethyl orthosilicate (TEOS) was studied by varying pH through adopting three different type basic catalysts (n-octylamine, dodecylamine and tetradecylamine), respectively. The effect of different templates to the formation of xerogels was investigated and characterized by FTIR, N 2 physisorption, TG-DSC and SEM analysis. The results showed that the morphology and textural characteristics of the xerogels prepared in three kinds of organic amine solutions were quite different. The texture of xerogels became more compact after addition of hydroxyl-terminated polydimethylsiloxane (PDMS-OH). Comparing with dodecylamine and tetradecylamine, n-octylamine is more suitable as catalyst to TEOS/PDMS for stone consolidation.
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高影响因子
BIOTECHNOLOGY LETTERS
·
2016
·Vol. 38
·期 7
·1121-1129
·
IF 1.639
Zhou Jian Qin,He Ting,Wang Jian Wen
Objectives To establish a method for microbial trans glutaminase (mTG)-mediated PEGylation of proteins at the level of lysine (Lys) residues. Results Carboxybenzyl-glutaminyl–glycinyl-methoxypolyethylene glycol (CBZ-QG-mPEG) was prepared by introducing carboxybenzyl-glutaminyl-glycine (CBZ-QG) to mPEG amine. The analysis by Fourier transform infrared spectroscopy and SDS-PAGE showed that CBZ-QG-mPEG was successfully synthesized and can be recognized by mTG as an acyl donor to modify therapeutic protein, cytochrome c (cyt c ). Finally, under an optimized condition (cyt c 0.5 mg/ml, CBZ-QG-mPEG 11.25 mg/ml, mTG 0.5 mg/ml, 37 °C, 2 h), the PEGylation yield reached 76.5 %. Conclusions This is the first study regarding the PEGylation of protein at the level of Lys residues catalyzed by mTG. The novel method could be employed to immobilize active proteins and modify therapeutic proteins.
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PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 4
·1-11
·
IF 1.551
Ren Huixue,Jiang Jiahui,Wu Daoji,Gao Zhimin,Sun Youmin,Luo Congwei
Selective adsorption of Pb(II) and Cr(VI) by surfactant-modified and unmodified zeolites is discussed in this paper. The influences of pH, ionic strength, temperature, and adsorption time on Cr(VI) and Pb(II) adsorption are studied, The characteristics of the surface and inner structures of zeolites before and after modification are analyzed through infrared spectroscopy, scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, and zeta potential measurement. Results show that the characteristics of electric charge on the zeolite surface had changed after modification, which resulted in selective adsorption of Cr(VI) and Pb(II). Moreover, kinetic study reveals that adsorption by the different zeolites coincides with the Langmuir model and pseudo-second-order kinetic equation. The intraparticle diffusion equation proves that the Cr(VI) adsorption is mainly electrostatic, whereas Pb(II) adsorption proceeds via intrapore and electrostatic adsorption on the zeolite surface. This difference in mechanisms endows selectivity of metal ion adsorption by the modified zeolites. This study provides a reference on zeolite modification for use in various applications, such as wastewater treatment.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 4
·787-793
·
IF 1.89
Liu Baijun,Fu Zhongyu,Zhang Mingyao,Zhang Huixuan
The particle coagulation technology in emulsion polymerization is a novel and facile approach to prepare large-scale, narrowly dispersed latex particles. However, the formation of narrowly dispersed latex particles under particle coagulation at a high zeta potential is surprising. To elucidate this observation, a detailed investigation on the relationship between particle coagulation and particle size distribution was carried out. Unlike the conventional emulsion polymerization, a rapid decrease in the particle number and an increase in the particle size were clearly observed during the polymerization. The results confirm the occurrence of particle coagulation. The width of zeta potential and particle size distribution also decreased with particle coagulation, resulting in large-size, narrowly dispersed latex particles. These phenomena were explained by the competitive growth mechanism.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 228
·期 1
·1-12
·
IF 1.551
Jiang Meng,Qi Yun,Cui Yuan-Lu,Zhao Lin,Liu Shejiang
A rutin-Cr(III) loaded alginate microspheres, which can act as reduction-adsorption microreactor, was designed to reduce Cr(VI) to Cr(III) and recover it. Different from the rutin-Cr(III) complex in alginate-chitosan microcapsule we previously reported, which can sustained release rutin-Cr(III) and reduce Cr(VI) to Cr(III), this microreactor can not only reduce Cr(VI) but also adsorb/recover Cr(III) in aqueous solution. This microreactor was prepared by loading metal complex of rutin into alginate microsphere. It was found that Cr(VI) was initially reduced to Cr(III) by rutin-Cr(III), and then the product Cr(III) was absorbed in the microspheres. Both Cr(VI) reduction rate and Cr(III) adsorption rate were pH-dependent. Cr(VI) can be completely reduced to Cr(III) at pH 1–4 with a reduction capability of 1.27 (±0.078) mmol/g (pH 1, 4 h). The highest blank alginate microsphere adsorption capacity was 1.82 (±0.042) mmol/g at pH 4. It was assumed that reduction-adsorption was the mechanism of total Cr removal by the reduction-absorption microreactor. Recovery experiment showed that 93% and 98% of Cr(III) can be recovered by EDTA and sodium citrate, respectively.
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