ACS Applied Nano Materials
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2022
·
IF 6.14
Shengqi Lu,Bo Ouyang,Songmao Han,Fengyu Qiao,Kai Chen,Fan Wu,Aming Xie,Erjun Kan,Haibo Zeng
With the development of electronic technology, flexible electromagnetic wave shielding materials have attracted considerable interests in various fields. However, multifunctional electromagnetic wave shielding materials with great flexibility, excellent efficiency, environmental-friendliness, and corrosion resistance are urgently needed to be investigated. Although several works have achieved such frameworks, the extremely complicated fabrication procedure largely restricts their broad application. Accordingly, we deliver a facile strategy to achieve flexible polypyrrole nanotube–polyethylene glycol–polyvinyl alcohol hydrogel (PPPg) for enhanced electromagnetic shielding behaviors. The shielding effectiveness of the prepared hybrid with a thickness of 2 mm can reach 21 dB from 8 to 12 GHz. Additionally, such a film provides excellent flexibility with an elastic deformation of 100.9% at 2.28 MPa. H-plasma processing further leads to the hydrophobic feature of the PPPg hydrogel, promoting its great corrosion resistance in the natural environment. Our hydrogel is expected to become a promising multifunctional flexible nanocomposite hydrogel for high-performance wearable devices.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51921
·
IF 3.125
Hongxu Meng,Zhisong Li,Linbo Wu,Bo-Geng Li,Yumiao Hu,Kecheng Wang
Poly(ethylene 2,5-furandicarboxylate) (PEF) is a biobased polyester with high gas barrier properties, tensile modulus, and strength. In PEF chain, in addition to ethylene furandicarboxylate repeat unit, there is also a small amount of diethylene glycol furandicarboxylate (DF) unit which is formed by etherification side reactions. However, the effect of DF unit in a wide composition range on polymer properties is still unclear. In this study, random poly(ethylene-co-diethylene glycol 2,5-furandicarboxylate) (PEDF) copolymers were synthesized via melt copolycondensation of 2,5-furandicarboxylic acid, ethylene glycol and diethylene glycol. The copolymers were characterized and evaluated by intrinsic viscosity, 1 H NMR, thermal transition, thermogravimetric analysis, tensile, impact, and O 2 penetration tests. The copolymers are amorphous in the full composition range. The presence of less than 58 mol% DF unit in PEDFs neither improves the tensile ductility nor deteriorates the oxygen barrier performance, but reduces the glass transition temperature clearly. In comparison with poly(ethylene terephthalate), the PEDF copolymers containing <58 mol% DF unit have higher tensile modulus, strength, and O 2 barrier properties.
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JOURNAL OF PHYSICAL CHEMISTRY B
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2014
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IF 3.377
Cao Cao,Qing-Biao Wang,Lin-Jun Tang,Bing-Qiang Ge,Zhong-Xiu Chen,Shao-Ping Deng
Autocatalytic hydrolysis of fatty acid anhydrides induced by the spontaneously formed vesicles has been studied for years. However, whether the reaction autocatalyzed by vesicles formed in diluted solutions applies also to macromolecular crowded conditions remains unknown. The aim of this study is to characterize hydrolysis behavior of fatty acid anhydrides and formation of vesicles in crowded media. Inert macromolecular crowding agents such as polyethylene glycol (PEG) and Dextran were used to probe the impact of external crowding on the autocatalytic hydrolysis of fatty acid anhydrides with varied hydrophobic chain length. Under stringent conditions of crowding, hydrolysis rates of octanoic anhydride, nonanoic anhydride, and decanoic anhydride were found to decrease, but the rates of lauric anhydride and oleic anhydride increased. These results suggest that the effect of the crowding agent on the hydrolysis of fatty acid anhydrides was chain-length-dependent. Characterization of the size and polydispersity of vesicles formed from hydrolyzed fatty acid anhydrides in crowding revealed that long-chain fatty acids formed monodisperse vesicles easier at lower concentrations of PEG. Measurement of the critical aggregation concentration of ionized fatty acid in the presence of PEG showed that crowding media promoted vesicle formation from long-chain fatty acids but inhibited those from fatty acids with fewer carbon atoms. Further investigation of the diffusion property of ionized fatty acids in crowding agents suggested that PEG might create more hydrophobic areas for long-chain fatty acids anhydrides, which subsequently promoted the unreacted anhydride in the aqueous phase to be solubilized in the formed vesicles. This research provides information for understanding the autocatalytic reaction accompanied by self-producing aggregates and the behavior of fatty acids in crowding media.
研究领域:
生物化学
·
分子生物学
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Waste and Biomass Valorization
·
2023
·
IF 3.2
Chen Lungang,Chi Dongfeng,Liu Yong,Wang Chenguang,Zhang Xinghua,Liu Jianguo,Zhang Qi,Ma Longlong
Converting cellulose to ethylene glycol has been widely reported, while glucose is seldomly used to produce ethylene glycol. This is challenging due to side reactions such as glucose hydrogenation and isomerization, which have lower activation barriers than retro-aldol condensation. Moreover, cellobiose, rather than glucose, is main intermediates in obtaining ethylene glycol from cellulose. In this study, we found that the in situ synthesized Ru x W y /biochar catalyst exhibited high activity for converting glucose to EG. The Ru 3.5 W 35 /biochar catalyst achieved the highest EG yield of 61.61% under optimized conditions of 200 °C, 3 MPa H 2 , and 3 h. Characterization techniques were employed, revealing the crucial roles of W 5+ and Ru metal states, which were affected by the calcination temperature. The Ru 3.5 W 35 /biochar catalyst calcinated at 400 °C exhibited the best performance and was subsequently applied for the conversion of starch, xylose, and sucrose with appreciable yields of ethylene glycol and 1,2-propanediol. Graphical Abstract
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DESIGNED MONOMERS AND POLYMERS
·
2023
·
IF 1.6
Ye Jia,Lijun Fan,Changtong Song,Dong Chen,Xianhong Zhang,Yuhong Ma,Wantai Yang
In this work, we reported a novel emulsion copolymerization of vinyl chloride monomer (VCM) with amphipathic monomer poly (ethylene glycol) methyl ether methacrylate (PEGMA) by using sodium dodecyl sulfate (SDS) as emulsifier and K2S2O8/NaHSO3 as redox initiator. Owing to the multifunctionality of PEGMA that can serve as co-monomer and ‘emulsifier’, the emulsion copolymerization is achieved successfully and the interesting results demonstrate quite different features such as:(1) the stable P[(VC)-co-(PEGMA)] latex is obtained only when the mass ratio of PEGMA > 10% (to total monomer mass), (2) a small amount of ionic emulsifier SDS is required to achieve a stable latex, and (3) the mechanism of the micellar formation is different from the typical emulsion polymerization. Unexpectedly, the obtained copolymer formed high content of gel fraction which is mainly caused by the chain transfer reaction of the PVC growth chain radical to the hydrogen atom of the methylene from alkoxy (-OCH2CH2-) of the PEGMA oligomer chain. However, it could be inhibited effectively by the addition of chain transfer agent 2-mercaptoethanol (2-MCE). Subsequently, the properties of as-obtained P[(VC)-co-(PEGMA)] copolymer are evaluated carefully and it exhibited unique features such as self-plasticization, lower Tg (decreased from 83.1 to 59.6 °C), higher heat resistance (increased from 270 to 290 °C), hydrophilic, and high transparent in comparison to pure PVC. These outstanding features of the P[(VC)-co-(PEGMA)] copolymer offered a potential route for the functional modifications of PVC and broadened its further use.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Wei Li,Rong Chen,Xun Zhu,Qiang Liao,Dingding Ye,Yang Yang,Dongliang Li
Photothermal effect has shown great promise in manipulating the droplet evaporation. In this work, the evaporation of a propylene glycol–water binary droplet on the hydrophobic surface induced by the photothermal effect of a focused infrared laser with a wavelength of 1550 nm was experimentally investigated. Dynamic evaporation behaviors were discussed through the visualization method and image processing technique. Experimental results showed that the photothermally induced evaporation of such a binary droplet could be divided into two stages: the first stage dominated by the evaporation of water with more volatility represented by rapid variations of the droplet volume and geometric parameters and the second stage dominated by the evaporation of propylene glycol with less volatility represented by a smaller slope. Correspondingly, the binary droplet evaporation first experienced the mixed mode greatly related to the more volatile component, and then the constant contact radius mode greatly related to the less volatile component. In addition, the effects of the initial composition and input laser power were also discussed. This work provides a deep understanding of the photothermal effect of a focused light-caused evaporation behaviors of the propylene glycol–water binary droplets and a potential route to accommodate various applications using the evaporation of the binary droplet.
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Colloid and Interface Science Communications
·
2020
·
IF 2.831
Yanzhen Wen,Xiujuan Ge,Wenchao Gao,Wenlong Wei,Yan Qiao,Honghong Chang
The gemini surfactants with ethylene glycol as a starting material were synthesized, surface tensions and aggregation properties were evaluated, the wettability on paraffin, PTFE and metaplexis leave surfaces were determined. The experimental results showed the surface tensions of gemini surfactant solutions decrease first and then stabilize with the concentration increasing. The cmc values of surfactants decrease as their hydrophobic chain length increased, with the hydrophobic chain length of 14 shown the smallest γcmc and highest surface activity among these six investigated gemini surfactants. The equilibrium contact angles of investigated surfactant solutions on three solid surfaces of paraffin, PTFE, and metaplexis decrease firstly with the increase of concentrations, and finally stabilize. The 14-2-14 solutions can change surface of metaplexis leaves from hydrophobic to hydrophilic. The contact angles of gemini surfactants on paraffin surfaces vary significantly, and all of the six synthesized gemini surfactants can change paraffin surfaces from hydrophobic to hydrophilic.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Yanxia Zhu,Jun Cheng,Xiaodan Xu,Hongxiang Lu,Yangang Wang,Xi Li,Weijuan Yang
CO 2 capture with microalgae has been put forward in response to global concern on greenhouse gas emission . However, the short residence time and slow diffusion of CO 2 in water limits the growth of microalgae. In order to improve CO 2 transfer from gas phase to liquid phase and utilization by algal cells, polyethylene glycol 200 (PEG 200) was used as CO 2 absorbent to promote growth of Nannochloropsis oceanica with the bubbling of 15 vol% CO 2 . Total inorganic carbon (TIC) absorbed in culture medium remained constant at 5.6 mM when 15 vol% CO 2 was bubbled continuously. PEG 200 in the medium provided additional CO 2 absorption from 0.6 to 4.8 mM when PEG 200 concentration increased from 0.5 to 4 mM. The specific growth rate of N. oceanica reached the maximum (1.41 d −1 ) with 1 mM PEG 200 in culture medium, which was 21.5% higher than the specific growth rate without PEG 200. About 79% of the increase in biomass was attributed to the increased TIC with more CO 2 dissolution in culture medium because of PEG 200, and about 21% was attributed to PEG 200 itself utilized as an organic carbon source. In conclusion, PEG 200 as a CO 2 absorbent can effectively capture flue-gas CO 2 for algal growth.
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Journal of Environmental Sciences
·
2019
·
IF 3.556
Li Long,Xiaolan Hu,Jinpeng Yan,Yifan Zeng,Jiaqi Zhang,Yingwen Xue
It is urgent to explore an effective removal method for perfluorooctanoic acid (PFOA) due to its recalcitrant nature. In this study, a novel chitosan-based hydrogel (CEGH) was prepared with a simple method using chitosan and ethylene glycol through a repeated freezing–thawing procedure. The adsorption of PFOA anions to CEGH agreed well to the Freundlich–Langmuir model with a maximum adsorption capacity as high as 1275.9 mg/g, which is higher than reported values of most adsorbents for PFOA. The adsorption was influenced by experimental conditions. Experimental results showed that the main removal mechanism was the ionic hydrogen bond interaction between carbonyl groups (COO − ) of PFOA and protonated amine (NH + ) of the CEGH adsorbent. Therefore, CEGH is a very attractive adsorbent that can be used to remove PFOA from water in the future.
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ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Jiaojiao Bu,Juanjian Ru,Zhiwei Wang,Yixin Hua,Cunying Xu,Yuan Zhang,Yun Wang
Antimony powders with different morphologies have been prepared by electrodeposition at 313–353 K and 10–50 mA·cm −2 in 0.1 mol·L −1 SbCl 3 + ChCl-EG solution. The electrochemical behavior of Sb(III) on titanium electrode are studied by cyclic voltammetry. Results show that the electrochemical reduction of Sb(III) in SbCl 3 + ChCl-EG solution is a quasi-reversible process via a one-step reaction and the apparent activation energy is 50.723 kJ·mol −1 . The effects of current density and temperature on current efficiency and specific energy consumption are also investigated. The current efficiency increases with the increasing of current density and temperature. The specific energy consumption increased with the increase of current density, while decreased with the raising of temperature. When the current density is 40 mA·cm −2 at 353 K, the current efficiency and specific energy consumption are up to 97.89% and 1251.277 kW·h·t −1 , respectively. The morphology and phase of the products are analyzed by FESEM and XRD. It demonstrates that the deposition products are pure antimony powders and their preferred crystal plane is (0 1 2). The pineal, wheat grain, badminton, dendritic, and cluster-like antimony powders can be prepared by controlling electrodeposition parameters. The particles size range of antimony powders are 0.21–261.05 μm.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2018
·Vol. 33
·期 6
·1540-1545
·
IF 0.524
Wang Yu,Wang Youyun,Wang Wanxia,Zhu Hongda,Liu Mingxing
Colloidal mesoporous silica nanoparticles functionalized with carboxy-terminated polyethylene glycol (CMS-PEG-COOH) were successfully synthesized by covalently grafting dicarboxy-terminated polyethylene glycol (HOOC-PEG-COOH) on the surface of the amino functionalized CMS nanoparticles with amide bond as a cross linker. Moreover, the structural and particle properties of CMS-PEG-COOH were characterized by nuclear magnetic resonance spectroscopy ( 1 H-NMR), transmission electron microscopy (TEM), dynamic light scattering (DLS), nitrogen adsorption-desorption measurements, X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The nanomaterials presented a relatively uniform spherical shape morphology with diameters of about 120 nm,and favorable dispersibility in weak acid solution. The CMS-PEG-COOH exhibited no changes in the state of amorphous, while the mesopores sizes of 5.25 nm might provide the nanomaterials with large capacity for the loading and releasing of drugs. So the results indicated that CMS-PEG-COOH might be a critical nanomaterial for drug delivery system in the future.
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2018
·
IF 3.862
Lijun Hu,Min Li,Zhipeng Zhang,Yuanyuan Shen,Shengrong Guo
Paclitaxel (PTX), one of the most potent anticancer agents , has showed a remarkable activity against varieties of tumors. However, the bioavailability of PTX is quite low due to its poor aqueous solubility. Moreover, the emerging multidrug resistance (MDR) in cancer to PTX remains a major obstacle for successful chemotherapy. In order to address these problems, we developed self-assembly of biotinylated poly(ethylene glycol)-poly(curcumin) (Biotin-PEG-PCDA) for PTX delivery (termed as PTX-BPC NPs) with the application of mPEG 2K -P(CL-co-LLA) as an emulsifier . The loading content and encapsulation efficiency of PTX were 13.2% and 92.0%, respectively. In vitro drug release study showed that PTX-BPC NPs could degrade rapidly and then release the PTX payload in a 10 mM glutathione (GSH) environment. Compared with free PTX, PTX-BPC NPs exhibited enhanced anticancer efficacy (IC 50(MCF-7/ADR cells) , 17.28 µg/mL vs. 1.15 µg/mL). In addition, these biotin-modified nanoparticles could also significantly reverse PTX resistance by suppressing the over-expression of P-gp, thus resulting in increased intracellular drug accumulation and reduced drug efflux in MCF-7/ADR cells, which showed a great anticancer effect.
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