CARBOHYDRATE POLYMERS
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2013
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IF 3.479
Yiming Zhou,Shiyu Fu,Liangliang Zhang,Huaiyu Zhan
Superabsorbents based on carboxylated cellulose nanofibrils (CCNFs) and carboxymethyl cellulose-g-poly(acrylic acid-co-acrylamide) were synthesized. A series of experiments were performed to evaluate the influence of factors such as CCNFs amount, solution pH, temperature, salt solution type and concentration on the swelling behaviors of the hydrogels. The water uptake of the hydrogels strongly depended on the CCNF content, the swelling capacity in distilled water increased dramatically from 245.8 to 458.7 g/g with the addition of CCNFs up to 2.5 wt%. Furthermore, the incorporation of CCNFs improved salt resistance properties of the hydrogels with slower deswelling rate and higher water retention capacity at deswelling equilibrium. Besides, the CCNF nanocomposite hydrogels presented better responsive behavior in relation to pH presence and showed an increase in water retention capacity at various temperatures. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were employed to examine the structure and morphologies of the prepared superabsorbent hydrogels.
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JOURNAL OF NANOBIOTECHNOLOGY
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2015
·Vol. 13
·期 1
·1-11
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IF 4.115
Wang Bing,Yu Xiu-Chun,Xu Song-Feng,Xu Ming
Background The combination of chemotherapeutic drugs with different pharmacological action has emerged as a promising therapeutic strategy in the treatment of cancers. Present study examines the antitumor potential of paclitaxel (PTX) and etoposide (ETP)-loaded PLGA nanoparticles for the treatment of osteosarcoma.Results The resulting drug-loaded PLGA NP exhibited a nanosize dimension with uniform spherical morphology. The NP exhibited a sustained release profile for both PTX and ETP throughout the study period without any sign of initial burst release. The combinational drug-loaded PLGA NP enhanced the cytotoxic effect in MG63 and Saos-2 osteosarcoma cell lines, in comparison to either native drug alone or in cocktail combinations. Additionally, NPs showed an appreciable uptake in MG63 cells in a time-based manner. Co-delivery of anticancer drugs resulted in enhanced cell cycle arrest and cell apoptosis. The results clearly showed that combinational drugs remarkably improved the therapeutic index of chemotherapeutic drugs. The greater inhibitory effect of nanoparticle combination would be of great advantage during systemic cancer therapy.Conclusion Taken together, our study demonstrated that PTX-ETP/PLGA NP based combination therapy holds significant potential towards the treatment of osteosarcoma.
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ELECTROCHIMICA ACTA
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2016
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IF 4.803
Hong Xiao,Wenjun Guo,Bin Sun,Meishan Pei,Guowei Zhou
A series of mesoporous TiO 2 nanotubes/reduced graphene oxide (TiO 2 NT/RGO) and Co-doped TiO 2 NT/RGO composites were synthesized via a hydrothermal method. In this method, graphene oxide (GO) was reduced to RGO, whereas TiO 2 NT and Co-doped TiO 2 NT were prepared using poly(ethylene-glycol)-block-poly(propy glycol)-block-poly(ethylene-glycol) as a structure-directing agent through a simple solvothermal route. Their morphology and properties were determined using X-ray diffraction, field emission scanning electron microscopy, UV–vis diffuse reflectance spectra, and Raman measurement. Results indicated that TiO 2 NT displayed mesoporous structures with lengths ranging from about 3 μm to 10 μm, tube diameters ranging from about 400 nm to 600 nm, wall thickness of about 250 nm, and mesoporous walls of about 6 nm. The electrochemical performance of the TiO 2 -based electrodes for supercapacitor was confirmed by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge–discharge in 0.5 mol L −1 Na 2 SO 4 aqueous electrolyte solution. The Co-doped TiO 2 NT/RGO composite electrode with 10.00 wt.% GO exhibited a specific capacitance of 27.5 F g −1 at a current density of 0.2 A g −1 in a symmetrical two-electrode cell, whereas the specific capacitance of TiO 2 was 0.7 F g −1 . The Co-doped TiO 2 NT/RGO composite electrode exhibited high rate capability and excellent long-term cycle stability. The outstanding performance of the Co-doped TiO 2 NT/RGO composite electrode was attributed to the synergistic effects on capacitive behavior of Co-doped TiO 2 NT combined with high electronic conductivity of the RGO sheets.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2015
·Vol. 78
·期 2
·293-298
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IF 1.532
Cui Hongtao,Ma Wenle,Wang Li,Xue Junying
Abstract
In this work, α-Co(OH) 2 monolayer nanosheets were prepared by an intercalation agent-free route utilizing a precipitation reaction between epoxide and aqueous complexes of cobalt ions ([Co(H 2 O) 6 ] 2+ ). The protonation and the following ring-opening reaction of epoxide promoted the hydrolysis of [Co(H 2 O) 6 ] 2+ , leading to the formation of α-Co(OH) 2 nanosheets. The obtained nanosheets were then exfoliated to monolayer nanosheets in formamide under ultrasonic vibration. A possible exfoliation mechanism is proposed for the exfoliating process of α-Co(OH) 2 nanosheets. The water molecules incorporated in the layered structure of α-Co(OH) 2 are considered to be the key medium for the layer exfoliation. It seems that the water molecules coordinated with the cobalt ions weakened the interlayer interaction. Therefore, the extraction of water molecules by formamide readily broke the interlayer connection in α-Co(OH) 2 , resulting in the exfoliation of nanosheets. Graphical Abstract α-Co(OH) 2 monolayer nanosheets were prepared by an intercalation agent-free route utilizing a precipitation reaction between epoxide and aqueous complexes of cobalt ions ([Co(H 2 O) 6 ] 2+ ).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2015
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IF 3.313
Xianpei Ren,Xiaodong Ren,Liuqing Pang,Yunxia Zhang,Qiang Ma,Haibo Fan,Shengzhong (Frank) Liu
Cost-effective materials for electrocatalytic water splitting are key to renewable energy research. In this work, MoS 2 /sulfur and nitrogen co-doped reduced graphene oxide (SNG) nanocomposite was produced via a two-step hydrothermal process. The formation of nanocomposite was confirmed by X-ray diffraction (XRD), Raman spectroscopy , scanning electron microscopy (SEM), transmission electron microscopy (TEM). It is found that the MoS 2 /SNG nanocomposite exhibits much higher catalytic activity for the hydrogen evolution reaction (HER) relative to MoS 2 and MoS 2 /RGO catalysts, as manifested by much larger cathodic current density with smaller overpotential of −120 mV and lower Tafel slope of 45 mV dec −1 . It is believed that the outstanding performance is attributed to the high electronic conductivity of SNG for fast charge transport. This study highlights the significance of the strong electronic coupling effect between the MoS 2 and SNG in the enhancement of HER electrocatalytic activity .
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JOURNAL OF POWER SOURCES
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2015
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IF 6.217
Qingsong Wang,Zhaoyin Wen,Jianhua Yang,Jun Jin,Xiao Huang,Xiangwei Wu,Jinduo Han
A thin coating layer composed of the mixture of the electronic conductive carbon and lithium ionic conductive inorganic solid electrolyte was introduced on one side of the routine Celgard separator. This functional coated separator is designed to localize the polysulfides on the cathode side and act as an upper current collector for further utilization of sulfur while alleviating the ion conductivity decrease induced by the dissolved polysulfides in the discharge and charge process. Moreover, catalytic conversion of polysulfides by the solid state highly ionic conductor is observed. This brings significant improvement in battery specific capacity and cycling stability, with an initial discharge capacity of 1247 mA h g −1 and a reversible capacity of 830 mA h g −1 after 150 extended cycles at 0.5 C rate. Rest-testing proves a low self-discharge and excellent capacity retention of the modified cells.
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WATER RESEARCH
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2017
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IF 6.942
Zhouzhou Liu,Hua Wei,Aimin Li,Hu Yang
The molecular structure of a material substantially determines its final application performance. In this work, a series of starch-based flocculants with different charge densities and average graft chain lengths were prepared by the co-graft polymerization of acrylamide and [(2-methacryloyloxyethyl) trimethyl ammonium chloride] (St- g -PAM-co-PDMC). The flocculation performance of St- g -PAM-co-PDMC was studied systematically at neutral pH using kaolin suspension and sodium humate (NaHA) aqueous solution as synthetic wastewaters. The effects of the two structural factors on the flocculation efficiency of the starch-based flocculants have been investigated. The experimental results showed that the charge density and average graft chain length contributed distinctly to flocculation performance during the removal of both kaolin particles and NaHA under insufficient and excessive flocculant dose conditions. The flocculation mechanisms of this starch-based flocculant were discussed in detail on the basis of the structure-activity relationship, which are significant to optimize the flocculation conditions and guide the development of novel high-performance flocculants.
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JOURNAL OF RARE EARTHS
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2017
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IF 2.429
Linying Du,Weiwei Wang,Han Yan,Xu Wang,Zhao Jin,Qisheng Song,Rui Si,Chunjiang Jia
Copper-ceria sheets catalysts with different loadings of copper (2 wt.%, 5 wt.% and 10 wt.%) supported on ceria nanosheets were synthesized via a deposition–precipitation (DP) method. The prepared catalysts were systematically characterized with various structural and textural detections including X-ray diffraction (XRD), Raman spectra , transmission electron microscopy (TEM), X-ray absorption fine structure (XAFS), and temperature-programmed reduction by hydrogen (H 2 -TPR), and tested for the CO oxidation reaction. Notably, the sample containing 5 wt.% of Cu exhibited the best catalytic performance as a result of the highest number of active CuO species on the catalyst surface. Further increase of copper content strongly affects the dispersion of copper and thus leads to the formation of less active bulk CuO phase, which was verified by XRD and H 2 -TPR analysis. Moreover, on the basis of in-situ diffuse reflectance infrared Fourier transform spectroscopy ( in-situ DRIFTS) results, the surface Cu + species, which are derived from the reduction of Cu 2+ , are likely to play a crucial role in the catalyzing CO oxidation. Consequently, the superior catalytic performance of the copper-ceria sheets is mainly attributed to the highly dispersed CuO x cluster rather than Cu-[O x ]-Ce structure, while the bulk CuO phase is adverse to the catalytic activity of CO oxidation.
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REACTIVE & FUNCTIONAL POLYMERS
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2016
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IF 2.725
Luanluan Zhang,Hejun Gao,Yunwen Liao
A series of functional cross-linked polymer (Poly(AMPS- co -DVB)) were synthesized by 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and divinylbenzene (DVB). The physicochemical properties of the Poly(AMPS- co -DVB) were characterized by FT-IR, TGA , SEM, XRD , Zeta potential and UV–Vis. Those results showed that the Poly(AMPS- co -DVB) could provide mounts of adsorption sites from its special structure. The effects of the initial pH, dosage, contact time, and temperature on the adsorption of Rhodamine B (RhB) onto the Poly(AMPS- co -DVB) were investigated. It was found that the initial pH was an important factor for the molecules form of RhB and the surface formation of Poly(AMPS- co -DVB). With increasing of molar ratio of AMPS/DVB, the adsorption efficiency increased gradually. In the adsorption process , both physical and chemical mechanism is presence to adsorb RhB. The maximum adsorption capacity could get 407.9 mg/g within 2 h at room temperature .
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Liping Lu,Chang Liu,Tianfang Kang,Xiayan Wang,Guangsheng Guo,Wujian Miao
An ultrasensitive and selective miRNA biosensor based on the luminol-H 2 O 2 electrochemiluminescence (ECL) system using hemin as a catalyzer for in situ ECL signal enhancement was reported. DNA probe was tethered onto the electrodeposited Au nanoparticles on a glassy carbon electrode, and the remaining active sites were then blocked with glucose oxidase (GOD). Subsequently, followed by miRNA hybridizing with the DNA probe, hemin molecules acted as the essential enhancer of ECL were intercalated into the DNA/miRNA duplex structure. The fully constructed biosensor was placed in a phosphate buffered solution containing luminol and glucose, where glucose was enzymatically decomposed by GOD to H 2 O 2 . Formation of reactive oxygen species (O 2 − ) from H 2 O 2 , which was a key step for luminol ECL production, was efficiently catalyzed by the intercalated hemin. Thus, enhanced ECL signal was obtained. Under the optimal conditions, this miRNA biosensor could sensitively and selectively detect target miRNA over approximately seven orders of magnitude between 0.050 and 1.0 × 10 5 pM, with a limit of detection of 50 fM. miRNAs extracted from the A459 cell line were quantified with the biosensor. The ECL enhancement strategy presented in this paper could open a new route for the development of extremely sensitive ECL based biosensors.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2017
·Vol. 32
·期 4
·772-776
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IF 0.447
Xiang Tao,Wang Qingxiu,Duan Lijie,Liu Fude
A conjugated polymer of poly(4,4'-bis(thien-2-yl)azobenzene-co-3-hexylthiophene) (PTAB-H), bearing azo group in main chain and soluble in THF, chloroform, was synthesized through FeCl3 oxidation copolymerization with 3-hexylthiophene, and the monomer of 4,4'-bis(thien-2-yl)azobenzene was synthesized by Sandmeyer reaction and Suzuki reaction. The UV-Vis spectra of PTAB-H reveal that azo group in the main chain can extend the absorption and lower the band gap. The fluorescent spectra, photoluminescence (PL) spectra, cyclic voltammetry (CV) of PTAB-H were recorded.The gel permeation chromatography (GPC), thermogravimetry analysis (TGA), and differential scanning calorimetry (DSC) measurements indicated that the molecular weight Mn, Mw and polydispersity indices (PDI) of the polymer are 10 876 g/mol, 22 338 g/mol and 2.05 respectively and the temperature of 5% weight-loss is 224.6 °C. No glass transition and crystallization melting peak was observed in the temperature range from 30 °C to 400 °C.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
·
IF 3.205
Zhiming Gao,Lin Cui,Hongwei Ma
Four methods were adopted to prepare samples 20%NiO/Al 2 O 3 with calcination fixed at 500 °C, which were then reduced into 20%Ni/Al 2 O 3 and used as catalysts for reaction of selective methanation of CO in H 2 -rich gas (CO-SMET). XRD and TPR measurements indicate that nickel aluminates were formed in the calcined samples and their formation was influenced by preparation methods. Higher temperatures were required to reduce the calcined samples more efficiently and to achieve a higher catalytic activity for CO-SMET. Among the four methods, the precipitation method using ammonium carbonate as precipitant produced the highest catalytic activity both for CO methanation and for CO 2 methanation after reduction at 800 °C for 2 h. The calcined sample 20%NiO/Al 2 O 3 prepared with the method was therefore used as support and impregnated with Ru 3+ solution. Ru addition promoted reduction of Ni 2+ ions in the calcined sample even at the low temperatures of 400 °C and 500 °C. The catalyst 1%Ru–20%Ni/Al 2 O 3 reduced at 500 °C thus had a superior performance, removing CO to ca. 30 ppm with a selectivity as high as 75% at reaction temperature of 220 °C.
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