POLYMER
·
2022
·
IF 4.432
Zhengli Peng,Mo Zhu,Jinxian Yang,Lianwei Li
In this study, by using a set of narrowly distributed polyethylene glycol (PEG) samples with varied average molar mass (PEG n , 9 < n < 454), we have systematically studied how PEG molar mass and solution concentration influence the thermal response behavior of methyl cellulose (MC) aqueous solutions ( M w = 4.3 × 10 5 g/mol, < R g > = 71 nm) by a combination of isothermal titration calorimetry (ITC), rheometer, UV–vis spectroscopy, laser light scattering (LLS) and atomic force microscopy (AFM). At room temperature , ITC result clarifies the existence of extremely weak hydrophobic interactions between MC and PEG chains. In addition, for MC/PEG mixed solution with shorter PEGs (PEG 22 and PEG 90 ), experimentally measured zero-shear viscosity (η exp ) is confirmed to be 5–10% higher than the theoretical values (η calc ), further supporting the interchain association. Whereas for MC/PEG 454 , insoluble aggregates are formed, which results in η exp < η calc . Further, dynamic laser scattering (DLS) results further reveal how the percentage of peak area of aggregates depends on the chain length of PEG. During the heating process from T = 20 to 70 °C, a combination of UV, LLS and AFM results clearly illustrates that the shorter PEG chains can effectively stabilize the formed MC fibers and prevent the fiber extension; whereas for longer PEG chains, they can not only promote the nucleation process, but also destabilize the formed fibers and promote the fiber extension. Our result unambiguously reveals the macromolecular effect of PEGs on the thermal response behavior of MC in solutions.
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RSC Advances
·
2022
·Vol. 12
·期 31
·19929-19935
·
IF 4.036
Zhirui Wu,Yuting Zhong,Zhiguo Wang,Ling Li,Xiaoguang Liu
rGO-modified indium oxide (In2O3) anchored PdPbAg nanoalloy composites (PdPbAg@rGO/In2O3) were prepared by a facile hydrothermal, annealing and reduction method. Electrochemical tests showed that the as-prepared trimetallic catalyst exhibited excellent electrocatalytic activity and high resistance to CO poisoning compared with commercial Pd/C, mono-Pd and different bimetallic catalysts. Specifically, PdPbAg@rGO/In2O3 has the highest forward peak current density of 213.89 mA cm−2, which is 7.89 times that of Pd/C (27.07 mA cm−2). After 3600 s chronoamperometry (CA) test, the retained current density of PdPbAg@rGO/In2O3 reaches 78.15% of the initial value. Its excellent electrocatalytic oxidation performance is attributed to the support with large specific surface area and the strong synergistic effect of PdPbAg nanoalloys, which provide a large number of interfaces and achievable reactive sites. In addition, the introduction of rGO into the In2O3 matrix contributes to its excellent electron transfer and large specific surface area, which is beneficial to improving the catalytic ability of the catalyst. The study of this novel composite material provides a conceptual and applicable route for the development of advanced high electrochemical performance Pd-based electrocatalysts for direct ethylene glycol fuel cells.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 38
·20571-20579
·
IF 14.511
Xue Jiang,Zemeng Dong,Qiong Zhang,Guang-Rui Xu,Jianping Lai,Zhenjiang Li,Lei Wang
The electrochemical oxidation of ethylene glycol (EG), which is favorable for replacing the sluggish oxygen evolution reaction (OER) in thermodynamics, realizes energy-saving hydrogen evolution and also produces high-value chemical products of glycolic acid. Under the guidance of this concept, PtRh nanowires with Rh atom modification (PtRh0.02@Rh NWs), which exhibited excellent properties during the hydrogen evolution reaction (HER) and ethylene glycol evolution reaction (EGOR), were designed and synthesized by controlling the reduction rate of metal precursor through a simple one-step solvothermal reduction. The interface strain effect produced by the metal co-doping effectively adjusted the electronic structure, contributing to introducing the heteroatom active center and inducing lattice strain, thereby achieving excellent electrocatalytic performance. The obtained PtRh0.02@Rh NWs exhibited excellent HER property with an extremely low overpotential of 30.6 and 45.8 mV, and Tafel slope of 39.1 and 39.5 mV dec−1 in alkaline water and seawater electrolytes, respectively, as well as outstanding EGOR properties with peak current density of 1.25 and 1.17 A mg−1, respectively. Additionally, the PtRh0.02@Rh NWs showed superior stability compared to that of commercial platinum black obtained from Johnson Matthey Corporation (JM-Pt black). When using PtRh0.02@Rh NWs as biofunctional materials for the HER in the cathode and the EGOR in the anode, a cell voltage of only 0.66 V for PtRh0.02@Rh NWs (HER)‖PtRh0.02@Rh NWs (EGOR) achieved a current density of 10 mA cm−2, which was much smaller than that of PtRh0.02@Rh NWs (HER)‖PtRh0.02@Rh NWs (OER) at 1.57 V. The results of electrochemical in situ Fourier transform infrared (FTIR) spectroscopy showed that the synthesized PtRh0.02@Rh NWs promoted the production of high-value glycolic acid when EG was dehydrogenated to form C2 intermediates. The Rh atoms modified on the surface of the Pt nanowires provided an effective strain effect to optimize the active sites, which creates a universal strategy for the design of highly efficient and durable bifunctional catalysts.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Kaixin Liu,Shuquan Huang,Yangxin Jin,Lan Ma,Wen-Xiong Wang,Jason Chun-Ho Lam
The continuous growth of e-waste necessitates an efficient method to recover their metal contents to improve their recycling rate. The successful recovery of the metallic component from Waste Electrical and Electronic Equipment (WEEE) can generate great economic benefits to incentivize the industrial recycling effort. In this study, we report the use of slurry electrolysis (SE) in pH-neutral ethylene glycol (EG) electrolyte to extract and recover the metallic component from waste printed circuit broad (WPCB) powder. The system operates at room temperature and atmospheric pressure, and the electrolyte can be recycled multiple times with no signs of chemical degradation . The EG electrolyte system can oxidize the metallic component without triggering anodic gas evolution, which allowed us to incorporate a reticulated vitreous carbon (RVC) foam anode to maximize the capture and oxidation of the metal content. The system demonstrated up to 99.1% Faraday efficiency for the cathodic metal deposition and could recover Cu from the WPCB powder in a selective manner of 59.7% in the presence of 12 other metals. The SE reaction system was also scalable and displayed no compromises on the Cu recovery selectivity . With the ability to leach and recover metallic content from WPCB in a mild and chemically benign condition, the SE system displayed much promise to be adapted for industrial-scale metal recovery from WPCB.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wenjia Luo,Zhenhua Niu,Peng Mu,Jian Li
Membrane separation systems have received extensive attention in the field of gas separation due to its low cost, high-efficiency and eco-friendly advantages. However, it is till challenging to break through the trade-off effect for a highly efficient membrane separation process. Herein, a high-performance CO 2 -philic MXene/PEG mixed matrix membrane is prepared by a simple vacuum filtration process. Excellent CO 2 permeance and selectivity in separation of the CO 2 /N 2 and CO 2 /CH 4 is shown for the as-prepared MXene/PEG (600) mixed matrix membrane because of CO 2 -philic property of the PEG and the nanochannels of the MXene . In permeation experiment, exceptional CO 2 permeance of 1626.99 GPU and ideal selectivity of 32.18 for CO 2 /N 2 and 27.84 for CO 2 /CH 4 , is exhibited, respectively, for 25 wt% MXene/PEG (600) mixed matrix membrane. This study provides a new strategy for design and fabrication of the CO 2 -philic MXene-based membrane with highly efficient separation of the CO 2 from natural gas and flue gas.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Mengting Zhou,Qingbo Xu,Jiangfei Liu,Tianyu Zhu,Yanhong Su,Jing Chu,Huaibao Cao,Hang Hu,Defeng Xu
Curcumin (CUR) is a natural compound extracted from turmeric (Curcuma longa), which has been reported to be a promising anti-cancer drug in various cancers. However, poor water solubility and low bioavailability posed a challenge for clinical application of curcumin. In this work, four CUR prodrugs, namely PEG4000-SS-CUR, PEG1500-SS-CUR, PEG4000-SeSe-CUR and PEG1500-SeSe-CUR were synthesized. These four CUR prodrugs have high CUR loading content and can self-assemble into spherical nanoparticles (NPs) with particle size of 90–190 nm in aqueous solution. The four CUR prodrug NPs exhibit good colloidal stability in PBS buffer and promoted drug release in response to GSH. Due to the enhanced water solubility, the four CUR prodrug NPs all exhibit reduced cellular uptake amount as compared to CUR in in vitro cellular uptake study. The four CUR prodrug NPs exhibit similar cytotoxicity against 22Rv1 cells as compared to free CUR while PEG4000-SeSe-CUR NPs exhibit the highest cytotoxicity and induce the highest cell apoptosis ratio against 4T1 cells in in vitro antitumor effect study. PEG4000-SeSe-CUR NPs developed in this work were proven to be an effective nanoformulation of CUR against 4T1 cells.
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CELLULOSE
·
2021
·Vol. 28
·期 18
·11315-11328
·
IF 5.044
Wang Huimin,Wang Xiaoying,Sun Tingting,Li Peixin,Chu Xiaomeng,Xing Xuteng,Liu Shaojie,Tang Erjun
As a highly efficient nitroxide radical catalyst for selective catalytic oxidation of cellulose, N-hydroxyphthalimide (NHPI) has attracted much attention because of its low price and light cellulose degradation. However, NHPI is insoluble in water and is difficult to recycle because of its small molar mass. To address the above issues, the water-soluble polyethylene glycol (PEG)-immobilized NHPI catalyst (PEG-NHPI) was designed and prepared in this work. Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), size exclusion chromatography (SEC) and UV–Vis light spectrophotometry were used to characterize PEG-NHPI. The results showed that PEG-NHPI catalysts with good water solubility and adjustable NHPI loading amounts were successfully synthesized. Using NaBr as promoter and NaClO as oxidant, PEG-NHPI mediated oxidation of cellulose was carried out and good catalytic performance was found. The catalytic performance of PEG-NHPI mediated oxidation of cellulose in water was higher than that in acetonitrile–water. The carboxyl content of PEG-NHPI oxidized cellulose could reach the level of free NHPI oxidized cellulose, and was equivalent to 68% of 2, 2, 6, 6-tetramethylpiperidine-N-oxyl (TEMPO) oxidized cellulose, while the degradation degree of cellulose was greatly reduced by more than 40%. The catalytic performance did not decrease significantly after six oxidation cycles. The structure of recycled PEG-NHPI was not changed. These results indicated that immobilizing NHPI onto PEG can achieve the unification of high catalytic performance and good recyclability.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Yifeng Yu,Congcong Wang,Qiaoqin Fu,Ying Wan,Aixi Yu
The migration of fibroblasts and endothelial cells is a critical determinant of wound-healing outcomes for skin injuries. Here, hyaluronic acid-tyramine (HAT) and thiolated glycol chitosan (TGC) conjugates were combined with copper-doped bioglass (ACuBG) nanoparticles to build a novel type of multi-crosslinked hydrogel for stimulating the migration of cells, and thus, expediting wound healing . The optimally devised HAT/TGC/ACuBG gels had markedly improved strength and stiffness compared to the gels built from either HAT or TGC while showing sufficient elasticity, which contributes to stimulating the migration of fibroblasts. The sustainable release of silicon and copper ions from the gels was found to jointly induce the migration of human umbilical vein endothelial cells . The results based on mouse full-thickness skin defects demonstrated that they were able to fully restore the skin defects with formation of complete appendages within two weeks, suggesting their promising potency for use in expediting wound healing.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Jing Tang,Shuwen Liu,Wen Liu,Yaochen Wang,Long Li,Zhangpeng Li,Jinqing Wang
Solvent-free covalent MXene nanofluids (MXene NFs) were prepared as eco-friendly additives to improve the dispersibility of MXene and the tribological performance of lubricants. Here, the tribological properties and tribo-mechanisms of MXene NFs additives in glycerin and polyethylene glycol (PEG 400) were evaluated, and pronounced differences were observed. In glycerin, the excellent anti-friction (28.9%) and anti-wear (98.0%) properties were realized after 0.5 wt% MXene NFs addition, for MXene NFs preferentially adsorbing onto the surface of friction pair and participating in the formation of tribofilm. However, in PEG 400, the poor friction-reducing and negative anti-wear performance were related to PEG 400 exhibiting high affinity towards steel substrate. This work provides a new approach for fabricating eco-friendly additives with excellent dispersion and lubricity.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Shaozheng Wang,Ruiting Hou,Lanlan Tian,Yule Li,Ping Yu,Hui Zhang,Qingming Chen
The strong metal-insulating transition and the high magnetoresistance near the Curie temperature make La x Ca 1- x MnO 3 ceramics it has potential application value in temperature detection, magnetic sensing. In this study, La 0.67 Ca 0.33 MnO 3 (LCMO) ceramics were prepared via the co-precipitation method using polyethylene glycol-2000 (PEG) as a dispersant. The investigation focused on the influence of PEG content on the crystal structure, electrical transport properties, and magnetoresistance of the ceramics. The dispersant effectively improved particle dispersion during the preparation of the precursor powder, resulting in smaller precursor powder size and enhanced sintering driving force during ceramic sintering. Consequently, the prepared ceramics exhibited larger grain size , improved uniformity, and reduced pore formation, significantly impacting their electrical and magnetic properties . The temperature coefficient of resistance (TCR) and magnetoresistance (MR) of the ceramics showed a non-monotonic behavior with increasing PEG content in the range of 0–8%. The TCR and MR initially increased, reaching maximum values of 32.2%·K −1 and 61.7%, respectively, at 4% PEG content. Beyond this point, both TCR and MR decreased. Our findings can promote the potential application of this material in infrared detect and magnetic sensors.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 45
·e54644
·
IF 3
Liang Yi,Longxiadi Zhou,Long Yan,Zhisheng Xu
To enhance the flame retardancy and aging resistance of grouting fireproof glass, different molecular weights of polyethylene glycol (PEG) were mixed with acrylamide (AM) to construct interpenetrating network hydrogels, then the obtained hydrogels were mixed with flame retardants to prepare a series of transparent flame-retarded hydrogels applied in the fireproof glass. The effects of PAM/PEG hydrogel with varying PEG molecular weight on the optical transparency, heat insulation and aging resistance of fireproof glass were investigated. Optical transparency analysis shows that the light transmittance of grouting fireproof glass decreases with the increase of PEG molecular weight in the PAM/PEG interpenetrating network. Fire tests show that PAM/PEG hydrogel significantly enhances the heat insulation and aging resistance of the grouting fireproof glass compared to the single PAM network hydrogel. The flame-retarded and anti-aging effects of PAM/PEG hydrogel in the fireproof glass varies with the PEG molecular weight, and the order is PAM/PEG2000 > PAM/PEG1500 > PAM/PEG1000 > PAM/PEG800. Accelerated aging test shows that PAM/PEG interpenetrating network hydrogel is less affected by aging conditions and exerts durable heat insulation and transmittance. Especially, the backside temperature of 3600 s and transmittance of PAM/PEG2000 system after 264 h aging test only changed 38.3°C and 1.3%, respectively, compared to the unaged PAM/PEG2000 system.
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INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2021
·Vol. 42
·期 6
·1-24
·
IF 1.608
Liu Ping,Liu Zimin,Zhao Tianxiang,Liu Fei,Liao Quanlan
Densities and viscosities for the binary system of tetraethylene glycol (1) + water (2) at T = (298.15 to 323.15) K were measured as a function of composition under atmospheric pressure. The excess properties, including excess molar volumes ( \(V_{{\text{M}}}^{{\text{E}}}\) ), viscosity deviations (Δ η ), and the excess Gibbs free energy of activation for viscous flow (Δ G * E ) were calculated by using density and viscosity data, respectively. Excess properties indicated that there are hydrogen bonding interactions between tetraethylene glycol and water molecules, which are investigated in detail by FTIR and UV–Vis spectra.
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危险品化学品经营许可证（带存储）