JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2019
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IF 1.479
Zhuang Xu,Wenjing Lou,Gaiqing Zhao,Qin Zhao,Nan Xu,Junying Hao,Xiaobo Wang
A novel biomimetic surface modification method utilizing mussel-inspired chemistry was used to prepare tungsten disulfide (WS2) nanocomposites, which enhanced the dispersion stability and tribological performance of WS2 in polyalkylene glycol (PAG). Herein, WS2-polydopamine-methoxypolyethylene glycol amine (WS2-PDA-MPGA) was first synthesized via mussel-inspired chemistry and used as a lubricant additive in PAG. After modification, the dispersion stability of WS2 nanosheets in PAG was obviously improved. Moreover, the tribological performance of WS2-PDA-MPGA in PAG at high temperature was evaluated by the oscillating reciprocating tribometer. Compared to pure PAG, the lubricant composition containing WS2-PDA-MPGA exhibited excellent performance in friction reduction and anti-wear properties at high temperature. The optimal tribological performance could be obtained when the percentage of additives was 0.9 wt%. The tribological results indicate that WS2-PDA-MPGA, with its good dispersion stability, has better friction reduction and anti-wear properties than does WS2 in PAG base oil. The chemical composition analysis of the wear surface indicated that a stable protective film had been formed by physical adsorption and tribo-chemical reactions. Therefore, the surface modification strategy is an effective way to improve the dispersion stability of WS2 in PAG, which can be expanded application of WS2 in the tribological field.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2014
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IF 5.03
Guo-Qiang Qi,Cheng-Lu Liang,Rui-Ying Bao,Zheng-Ying Liu,Wei Yang,Bang-Hu Xie,Ming-Bo Yang
Graphene oxide (GO) sheets are introduced to stabilize the shape of the most widely studied phase change material for thermal storage , polyethylene glycol (PEG) during the solid–liquid phase change process . In this composite, a maximum weight percentage of PEG as high as 96% without any leakage up to a temperature as high as 150 °C, far above the melting temperature of PEG, has been achieved. Such a weight percentage of PEG is the highest value among PEG based shape-stabilized PCMs to the best of author׳s knowledge. The shape-stable PCM presents a high heat storage capacity of 142.8 J g −1 and excellent thermal reliability within at least 200 melting/freezing cycles. The thermal properties of the PEG/GO composite PCMs with various GO contents are also investigated. The present study provides a highly potential shape-stabilized composite PCM with a high content of PEG for thermal energy storage as well as a way to enhance the heat storage density of PEG based shape-stabilized PCM.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
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IF 2.93
Shan-Shan Li,Yuan-Yuan Hu,Jiu-Ju Feng,Zhang-Ying Lv,Jian-Rong Chen,Ai-Jun Wang
In this paper, a simple, fast, and green method is developed for preparation of uniform Pd nanodendrites anchored on reduced graphene oxide (Pd/RGO) at room temperature , with the assistance of octylphenoxypolye thoxyethanol (NP-40) as a soft template, while no seed, organic solvent , or special apparatus involved. The as-prepared nanocomposites show the improved CO tolerance, enhanced catalytic activity , and better stability for ethylene glycol (EG) and glycerol (Gly) electrooxidation in alkaline media , compared with commercial Pd black and Pd/C catalysts. The synthetic strategy can be extended to fabricate other electrocatalysts in direct alcohol fuel cells .
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高影响因子
Nuclear Engineering and Technology
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2015
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IF 0.77
Jun Wei,Xiang Li,Tong Song,Zi-Fan Song,Zhen-Qi Chang,Da-Qiao Meng
The catalytic exchange of hydrogen isotopes between hydrogen and water has been known to be a very useful process for the separation of tritium from tritiated water. For the process, a highly active hydrophobic catalyst is needed. This study provides an effective fabrication method of size-controlled platinum/poly[styrene-divinylbenzene-tri(propylene glycol) diacrylate] [Pt/poly(SDB-TPGDA)] hydrophobic catalyst beads with a narrow size distribution. Platinum nanoparticles were prepared by γ-ray-induced reduction in the aqueous phase first, and then uniformly dispersed in SDB-TPGDA comonomer after the hydrophobization of platinum nanoparticles with alkylamine stabilizers. The porous Pt/poly(SDB-TPGDA) hydrophobic catalyst beads were synthesized by the UV-initiated polymerization of the mixture droplets prepared in a capillary-based microfluidic system. The size of as-prepared catalyst beads can be controlled in the range of 200–1,000 μm by adjusting the flow rate of dispersed and continuous phases, as well as the viscosity of the continuous phase. Sorbitan monooleate and cyclohexanol were used as coporogens to control the porosities of the catalyst beads.
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高影响因子
BIOMATERIALS
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2015
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IF 8.557
Xiao-Jiao Du,Ji-Long Wang,Wei-Wei Liu,Jin-Xian Yang,Chun-Yang Sun,Rong Sun,Hong-Jun Li,Song Shen,Ying-Li Luo,Xiao-Dong Ye,Yan-Hua Zhu,Xian-Zhu Yang,Jun Wang
Poly(ethylene glycol) (PEG) is usually used to protect nanoparticles from rapid clearance in blood. The effects are highly dependent on the surface PEG density of nanoparticles. However, there lacks a detailed and informative study in PEG density and in vivo drug delivery due to the critical techniques to precisely control the surface PEG density when maintaining other nano-properties. Here, we regulated the polymeric nanoparticles' size and surface PEG density by incorporating poly(ε-caprolactone) (PCL) homopolymer into poly(ethylene glycol)-block-poly(ε-caprolactone) (PEG–PCL) and adjusting the mass ratio of PCL to PEG–PCL during the nanoparticles preparation. We further developed a library of polymeric nanoparticles with different but controllable sizes and surface PEG densities by changing the molecular weight of the PCL block in PEG–PCL and tuning the molar ratio of repeating units of PCL (CL) to that of PEG (EG). We thus obtained a group of nanoparticles with variable surface PEG densities but with other nano-properties identical, and investigated the effects of surface PEG densities on the biological behaviors of nanoparticles in mice. We found that, high surface PEG density made the nanoparticles resistant to absorption of serum protein and uptake by macrophages, leading to a greater accumulation of nanoparticles in tumor tissue, which recuperated the defects of decreased internalization by tumor cells, resulting in superior antitumor efficacy when carrying docetaxel.
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PubMed
高影响因子
Nanoscale
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2015
·Vol. 7
·期 13
·5699-5705
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IF 7.394
Jing-Jing Lv,Li-Ping Mei,Xuexiang Weng,Ai-Jun Wang,Li-Li Chen,Xiang-Feng Liu,Jiu-Ju Feng
A facile one-pot solvothermal method was developed for the fabrication of well-defined three-dimensional highly branched Pt–Pd alloyed multipods, using ethylene glycol as a solvent and a reducing agent, along with N-methylimidazole as a structure-directing agent, without any seed, template, or surfactant. The as-prepared nanocrystals exhibited a relatively large electrochemically active surface area, improved electrocatalytic activity and superior stability for ethylene glycol oxidation in alkaline media, compared with commercial Pt black and Pd black, making them promising electrocatalysts in fuel cells.
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高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2013
·Vol. 51
·期 18
·3932-3940
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IF 3.543
Wei Lu,Meng-Ling Lu,Qing-Peng Zhang,Yong-Qing Tian,Zhi-Xiang Zhang,Han-Hong Xu
Environment-friendly and controlled release formulation is highly promising for reducing environmental pollution and achieving the most effective utilization of pesticides. As a novel “green” nanocarrier of pesticides, amphiphilic self-assembled nanoparticles were prepared by chemical conjugation of octahydrogenated retinoic acid (OR) to the backbone of glycol chitosan (GC). In aqueous media, the synthesized OR-GC conjugates formed nanosized particles with a diameter of 257 nm. Hydrophobic azadirachtin (AZA) was efficiently loaded into the OR-GC nanoparticles at a feed weight ratio of up to 1:4 using a simple dialysis method, the maximum drug-loading efficiency of which was 74%. AZA-OR-GC (25 wt %) nanoparticles also showed sustained release of the incorporated AZA (65% of the loaded dose was released in 7 days at 27 °C in phosphate-buffered saline; pH 7.2). Cytotoxicity tests and cell cycle arrest assays confirmed that OR-GC exhibits good biocompatibility; AZA-OR-GC (25 wt %) nanoparticles also showed favorable inhibition of cell proliferation in Sl-1 cells compared with free AZA in organic solvents. Overall, controlled release AZA-OR-GC may be a promising environment-friendly formulation for integrated pest management. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51 , 3932–3940
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2014
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IF 5.03
Changzhong Chen,Wenmin Liu,Zhiqiang Wang,Kelin Peng,Wanli Pan,Qian Xie
This study deals with the preparation and characterization of the composites of polyethylene glycol (PEG)/the synthesized polymeric solid-solid phase change material (SSPCM) as novel form stable phase change material (FSPCM) for thermal energy storage . The synthesized SSPCM can play two roles in the FSPCM: the supporting material and the phase change working substance. The influence of PEG content on crystalline properties and phase change behaviors of the FSPCMs was investigated. The polarizing optical microscopy (POM) images of FSPCMs show that all FSPCMs have the spherocrystal morphology, and the spherocrystal size of SSPCM increases with the increasing of PEG percent. The results from differential scanning calorimetry (DSC) indicate that the prepared FSPCMs with different PEG contents have high thermal storage density, and the enthalpy efficiency of them is much higher than that of the traditional FSPCMs due to the synergistic phase change effect of PEG and SSPCM. The Fourier transform infrared spectroscopy (FTIR) spectrum and DSC curve of the FSPCMs after thermal cycling are almost the same as those of the original samples, which indicates that the FSPCMs have excellent thermal reliability and reusability . The work not only supplied a kind of novel FSPCMs with high performances, but also proposed a new way to solve the problem of enthalpy decline of traditional FSPCMs and synthesized polymeric SSPCMs compared with solid-liquid PCMs.
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高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2015
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IF 4.38
Siyang Mu,Jing Guo,Yue Yu,Qingda An,Sen Zhang,Di Wang,Shuang Chen,Xuelin Huang,Shenglin Li
In this paper, a novel form-stable phase change materials (FSPCMs) of cross-linked poly(acrylonitrile-co-itaconate) (P(AN-co-IA))/polyethylene glycol (PEG) blend was prepared successfully. And it was systematically characterized by Fourier transform infrared (FT-IR), Raman, differential scanning calorimetry (DSC), X-ray diffraction (XRD), polarized optical microscopy (POM), Scanning electron microscope (SEM), Thermogravimetric (TG) and thermal conductivity measurements. FTIR analysis indicated that the cross-linked network had been synthesized. The results of DSC analysis showed that the cross-linked FSPCMs had good thermal reliability and heat storage durability after 1000 thermal cycles. The phase change temperature of the cross-linked FSPCMs was in the range of 23–53 °C and the phase change enthalpy was around 118.5 J/g, respectively. The XRD results indicated that PEG units in the cross-linked FSPCMs had the same crystal structure as the pure PEG. And it was observed that the PEG was dispersed into the network of the solid cross-linked P(AN-co-IA) by investigation of the structure of the FSPCMs using a SEM. TGA results confirmed that the initial degradation temperature of the cross-linked FSPCMs was 249 °C, which proves that cross-linked FSPCMs appeared good thermal stability. These results indicated that cross-linked FSPCMs could be considered as latent heat storage material for thermal energy storage applications.
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高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2016
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IF 1.733
Liyan Shi,Kaikai Ding,Xin Sun,Ling Zhang,Tian Zeng,Yihua Yin,Hua Zheng
In this paper, a kind of glutathione-sensitive polymeric micelles was prepared through assembling in aqueous solution of an amphiphilic polymeric prodrug which was synthesized by linkage of 6-mercaptopurine (6-MP) and polyethylene glycol monomethyl ether using propiolic acid as a connecting arm. The glutathione (GSH)-sensitive strategy is based on a Michael addition–elimination reaction, that is the amphiphilic polymeric prodrug which contains α, β-unsaturated carbonyl group acts as a Michael acceptor to receive the attack of nucleophile – glutathione, and undergoes elimination reaction to release the original drug. Transmission electron microscope observation showed that the polymeric micelles (PMs) had a spherical-like morphology with a mean diameter of 28 ± 3.2 nm. The dynamic light scattering investigation data exhibited that the size and distribution changes of PMs are negligible after being placed for 15 days. In vitro drug release study indicated that only less than 13% of 6-MP was released from the micelles under GSH stimulation at micromolar level, while 34.5, 53.7, and 77.8% accumulative release rates were achieved under GSH stimulation at millimolar level (1, 2 and 10 mM), respectively. The cell inhibition rate of PM solution against HL-60 cells carried out by MTT method reached 85%. The cellular uptake and the intracellular drug release of PMs in HL-60 cells were observed through determining the intracellular 6-MP content by UV–vis spectrophotometer. In vitro macrophage uptake study showed a low phagocytosis rate, indicating the long-circulation ability of the PMs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Fangfang Teng,Peizong Deng,Zhimei Song,Feilong Zhou,Runliang Feng,Na Liu
In order to improve azithromycin’s antibacterial activity in acidic medium, monomethoxy poly (ethylene glycol)-block-poly (aspartic acid-graft-imidazole) copolymer was synthesized through allylation , free radical addition, ring-opening polymerization and amidation reactions with methoxy poly (ethylene glycol) as raw material. Drug loading capacity and encapsulation efficiency of azithromycin-loaded micelles prepared via thin film hydration method were 11.58 ± 0.86% and 96.06 ± 1.93%, respectively. The drug-loaded micelles showed pH-dependent property in the respects of particle size, zeta potential at the range of pH 5.5–7.8. It could control drug in vitro release and demonstrate higher release rate at pH 6.0 than that at pH 7.4. In vitro antibacterial experiment indicated that the activity of azithromycin-loaded micelles against S. aureus was superior to free azithromycin in medium at both pH 6.0 and pH 7.4. Using fluorescein as substitute with pH-dependent fluorescence decrease property, laser confocal fluorescence microscopy analysis confirmed that cellular uptake of micelles was improved due to protonation of copolymer’s imidazole groups at pH 6.0. The enhanced cellular uptake and release of drug caused its activity enhancement in acidic medium when compared with free drug. The micellar drug delivery system should be potential application in the field of bacterial infection treatment.
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高影响因子
Analytical Methods
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2016
·Vol. 8
·期 23
·4554-4562
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IF 1.915
Man Jia,Guang-Yin Sun,Yong Xin Zhao,Zhao-Sheng Liu,Haji Akber Aisa
The efforts in the present work focus on the topic of reducing template consumption in the preparation of molecularly imprinted polymers (MIPs). For this purpose, the effect of polyethylene glycol (PEG) as a molecular crowding agent on reducing template consumption in the preparation of MIPs was investigated. To prepare MIP monoliths with punicalagin, acrylamide was used as the functional monomer, and ethylene glycol dimethacrylate was the cross-linking monomer, with a mixture of PEG–THF–toluene as a porogen. It was found that the molecular weight of PEG, the ratio of the template to functional monomer, amount of PEG, level of DMF and the composition of the mobile phase greatly affected the retention of the template and the performance of molecular recognition. The PEG-based imprinted monolith still showed a specific imprinting effect even at the ratio of functional monomer to template of 1353 : 1. The optimal MIPs can be used as solid-phase extraction sorbents for the purification of punicalagin with a recovery of 85% and a purity of 97.7% from the crude extract of pomegranate-rind.
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