International Journal of Electrochemical Science
·
2024
·
IF 1.3
Shaogao Chen,Jinlong Fan,Tao Lei,Zhen Zou,Jiabao Yi,Shuang Tan,Xingwen Zheng
The corrosion behavior of 6063 aluminum alloy in glycol-water solution with different concentrations of oxalic acid under different temperatures and the inhibitve effect of ammonium alcohol polyvinyl phosphate (AAPP) on its corrosion were investigated by weight loss experiment, electrochemical measurements and scanning electron microscopy (SEM). The results showed that low concentration of oxalic acid had a certain inhibitory effect on the corrosion of 6063 aluminum alloy in glycol-water solution, but high concentration of oxalic acid accelerated its corrosion. AAPP was a mixed type corrosion inhibitor with a predominantly anodic inhibition for 6063 aluminum alloy in a ethylene glycol-water solution containing oxalic acid, its corrosion inhibition efficiency was up to 90% at a concentration of 0.5 g/L under 30 ℃. The effect of AAPP on the surface of 6063 aluminum alloy obeyed the Langmuir isotherm equation. And the corrosion inhibition of AAPP for 6063 aluminum alloy was further confirmed by the results of weight loss experiment and SEM.
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高影响因子
SOLID STATE IONICS
·
2018
·
IF 2.751
Huihui Zeng,Xiaoxiao Ji,Fangchang Tsai,Qunchao Zhang,Tao Jiang,Robert K.Y. Li,Hengchong Shi,Shifang Luan,Dean Shi
The poor contact between the cathode and the solid polymer electrolyte (SPE) is one of the primary causes for the low specific capacities of lithium ion batteries . In this work, a composite cathode material containing LiFePO 4 nanoparticles encapsulated by PEG-based polymer electrolyte (coated LiFePO 4 ) are prepared in order to increase the interfacial contact area between SPE and cathode materials. The LiFePO 4 /SPE/Li half-cell battery with coated LiFePO 4 (C-LFP) and uncoated LiFePO 4 (U-LFP) are assembled and their electrochemical performances are studied. The optimal LiFePO 4 /SPE weight ratio in the composites cathode is 60/15. When the cathode thickness is 100 μm, the specific capacity of battery with C-LFP can reach up to 138 mAhg −1 , which is 2.5 times higher than that with U-LFP under 1C charge-and-discharge rate at 60 °C. Moreover, the capacity retention of C-LFP is 91% after 300 cycles, while that of U-LFP is only 18%. Large cracks emerge in the cathode with U-LFP, while no damage can be found in that with C-LFP after 300 cycles at 1C. This should be ascribed to the existence of polymer buffer layers among LiFePO 4 nanoparticles to alleviate the stress induced by their volume changes during the charge-and-discharge cycling process. This enhancement effect increases along with the increase of cathode thickness. When the cathode thickness increases up to 200 μm, the specific capacity of battery with C-LFP cathode is almost 4 times higher than that with U-LFP.
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高影响因子
POLYMER
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2015
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IF 3.562
Xue Jiang,Chun Feng,Guolin Lu,Xiaoyu Huang
A homopolymer strategy was developed to synthesize temperature and pH/CO 2 stimulus-responsive homopolymers. A new class of acrylamide monomers bearing oligo(ethylene glycol) unit and N,N -diethylaminoethyl group were designed and prepared through Aza-Michael addition reaction followed by amidation with acryloyl chloride using amino group as a linkage to connect oligo(ethylene glycol), N,N -diethylaminoethyl, and polymerizable double bond groups together. Subsequently, the corresponding homopolymers containing oligo(ethylene glycol) unit and N,N -diethylaminoethyl group in each repeated unit were prepared via RAFT polymerization with controlled molecular weights and relatively narrow molecular weight distributions . The lower critical solution temperature (LCST) of homopolymer was examined to be influenced by molecular weight, salt concentration, and pH value of aqueous solution. The LCSTs of homopolymers could be tuned in a wide temperature window by changing pH value of aqueous solution and it increased with the decrease of pH value. Particularly, CO 2 gas as a unique pH stimulus can also reversibly adjust the solubility of homopolymer without the addition of acids or bases.
研究领域:
高分子化学
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智能材料
·
药物递送
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生物医用材料
·
刺激响应材料
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2014
·
IF 0
Rui-Ying Bao,Wei Yang,Xin-Feng Wei,Bang-Hu Xie,Ming-Bo Yang
Melt processing of polymers is preferable in industry. Unfortunately, for high molecular weight (Mw) poly(l-lactide)/poly(d-lactide) (PLLA/PDLA) blends, exclusive formation of stereocomplex (sc) crystallites from the melt has never been achieved. We proposed a new and simple approach to enhance the melt crystallization of sc crystallites from high Mw PLLA/PDLA by using poly(ethylene glycol) (PEG). The crystallizability of the PLLA/PDLA blend is greatly enhanced by PEG during crystallization from the melt. The resulted crystalline structures depend on the Mw and content of PEG, and the crystallinity of sc crystallites increases with increasing content or decreasing Mw of PEG. More importantly, exclusive formation of sc crystallites is achieved in the blends with 10% PEG having Mw values of 1000 or 2000 g mol–1. Polarized optical microscopy (POM) observation shows that the spherulitic growth rates of sc crystallites are accelerated. The results demonstrate that segmental mobility of polylactides (PLA) chains plays a dominant role on the formation of sc crystallites from melt and provide a simple way to prepare sc crystallites from high Mw PLA by melt blending and enlarge the applications of PLA.
研究领域:
高分子科学
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材料工程
·
聚合物结晶
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Xin Ge,Hao Xiong,Chengzhe Niu,Mingyu Li,Huitao Yu,Lina Jia,Ruiguang Xing,Gaofei Pan,Yanan Li,Jinxiao Bao
The encapsulation of solid-liquid phase change materials (PCMs) provides good shape stability and mechanical strength for further applications in thermal management, which is an attractive topic in the development of materials for thermal energy storage. In this work, a novel and facile strategy was developed for the encapsulation of polyethylene glycol (PEG). Hydrogels containing sodium alginate (SA) and PEG were first prepared through the formation of hydrogen bonds or chelation with metal ions including Ca 2+ , Ce 3+ and La 3+ . Then, macroporous foams with a unique “bone-like” structure were synthesized via freeze-drying while PEG was encapsulated as “bone marrow” by SA. The foams exhibited varied microstructures with different preparation strategies. After mold pressing, the PCMs maintained excellent shape stability at temperatures much higher than the melting point of PEG. They provided high latent heat, reaching 167.26 J/g, and high relative latent heat efficiency. After 200 thermal cycles, the latent heat retention rate remained as high as 97.06 %. This study establishes a promising approach for the encapsulation of PEG as a shape-stable PCM. Furthermore, the heterogeneous structure of the foams synthesized in this work shows great potential for the development of novel functional materials.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2023
·
IF 5.8
Yue Huang,Chenguang Yang,Jianlin lv,Yu Zhang,Kun Wang,Lili Ma,Zhilin Liu,Haiyang Yu,Mingqiang Li,Zhaohui Tang
Poly(L-glutamic acid)- g -methoxy poly(ethylene glycol)/Combretastatin A4 (CA4)/BLZ945 nanoparticles (CB-NPs) have shown great potential in synergistic cancer therapy. However, it is still unclear how the nanoparticles’ formula, such as injection dose, active agent ratio, and drug loading content, affects the side effects and in vivo efficacy of CB-NPs. In this study, a series of CB-NPs with different BLZ945/CA4 (B/C) ratios and drug loading contents were synthesized and evaluated on a hepatoma (H22) tumor-bearing mice model. The injection dose and B/C ratio were found to have a significant influence on the in vivo anticancer efficacy. The CB-NPs 20 with B/C weight ratio of 0.45/1, and total drug loading content (B + C) of 20.7 wt%, showed the highest potential for clinical application. Systematic pharmacokinetics , biodistribution , and in vivo efficacy evaluation for CB-NPs 20 have been finished, which may provide significant instruction for medicine screening and clinical application.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Haitao Huang,Zhuxin Zhou,Chao Qian,Siwei Liu,Zhenguo Chi,Jiarui Xu,Min Yue,Yi Zhang
To improve the lithium-ion transporting ability in lithium-ion batteries, a high-performance polyimide-based lithium-ion battery separator (PI-mod) was prepared by chemically grafting poly(ethylene glycol) (PEG) onto the surface of a heat-resistant polyimide nanofiber matrix with the assistance of amino-rich polyethyleneimine (PEI). The resulted PEI–PEG polymer coating exhibited unique gel-like properties with an electrolyte uptake rate of 168%, an area resistance as low as 2.60 Ω·cm2, and an ionic conductivity up to 2.33 mS·cm–1, which are 3.5, 0.10, and 12.3 times that of the commercial separator Celgard 2320, respectively. Meanwhile, the heat-resistant polyimide skeleton can effectively avoid thermal shrinkage of the modified separator even after 200 °C treatment for 0.5 h, which ensures the safety of the battery working under extreme conditions. The modified PI separator possessed a high electrochemical stability window of 4.5 V. Compared with the batteries from the commercial separator Celgard 2320 and the pure polyimide matrix, the assembled coin cell with the PI-mod separator showed much better rate capabilities and capacity retention due to the high electrolyte affinity of the PEI-PEG polymer coating. The developed strategy of using the electrolyte-swollen polymer to modify the thermal-resistant separator network provides an efficient way for establishing high-power lithium-ion batteries with good safety performance.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qing Li,Xiaojie Zhuang,Guanhong Zhou,Zhenfei Yang,Ting Yang,Hongbo Xiao,Tao Xu,Wenlei Wang
A novel polyacrylic acid/carboxylated nanocellulose fiber/polyethylene glycol hydrogel loaded with nano-ZnO (ZnO-PAA/CNF/PEG: GH-2 (wt(ZnO)% = 12% and wt(PEG)% = 16%)) was synthesized to remove Cr(VI) from wastewater by adsorption synergistic photocatalytic reduction. The effects of ZnO content, PEG content and pH on the removal efficiency of Cr(VI) were investigated. The removal performance and mechanism of Cr(VI) by hydrogels were systematically studied by various techniques. The results showed that when the initial pH = 2, the initial concentration of Cr(VI) = 20 mg/L, the hydrogel dose = 0.5 g/L, and Irradiation power of mercury lamp was 500 W, the removal efficiency of Cr(VI) was 97.22% (dark adsorption for 60 min and photocatalysis for 50 min). The addition of PEG greatly reduced the agglomeration of nano-ZnO in GH-2 and facilitated the separation of photogenerated electron-hole pairs. The adsorption process of Cr(VI) by GH-2 accords with pseudo-second-order kinetics. The photocatalytic process conforms to the pseudo-first-order reaction kinetics. Under the optimal experimental conditions, the removal efficiency of Cr(VI) by GH-2 was still as high as 87.99% after 5 cycles. The removal mechanism of Cr(VI) was mainly through electrostatic attraction, chemical adsorption and photocatalytic reduction. This study provides a feasible method for the synthesis of hydrogel materials with excellent adsorption synergistic photocatalytic performance for the treatment of Cr(VI)-containing wastewater.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 12
·1860
·
IF 5.3
Mingxuan Zhang,Jiawei Zhou,Chunlei Wan,Ming Liu,Xia Wu,Jihong Sun
Clinoptilolite (CP) was successfully synthesized via a hydrothermal route in the presence of polyethylene glycol (PEG), and it was then delaminated by washing using Zn2+containing acid. HKUST-1, as one kind of the Cu-based MOFs, showed a high CO2adsorption capacity owing to its large pore volume and specific surface area. In the present work, we selected one of the most efficient ways for preparing the HKUST-1@CP compounds via coordination between exchanged Cu2+and ligand (trimesic acid). Their structural and textural properties were characterized by XRD, SAXS, N2sorption isotherms, SEM, and TG-DSC profiles. Particularly, the effect of the additive PEG (average molecular weight of 600) on the induction (nucleation) periods and growth behaviors were detailed and investigated in the hydrothermal crystallization procedures of synthetic CPs. The corresponding activation energies of induction (En) and growth (Eg) periods during crystallization intervals were calculated. Meanwhile, the pore size of the inter-particles of HKUST-1@CP was 14.16 nm, and the BET specific area and pore volume were 55.2 m2/g and 0.20 cm3/g, respectively. Their CO2and CH4adsorption capacities and selectivity were preliminarily explored, showing 0.93 mmol/g for HKUST-1@CP at 298 K with the highest selective factor of 5.87 for CO2/CH4, and the dynamic separation performance was evaluated in column breakthrough experiments. These results suggested an efficient way of preparing zeolites and MOFs composites that is conducive to being a promising adsorbent for applications in gas separation.Keywords:clinoptilolite;HKUST-1;composites;fractal structures;delamination;adsorptive separations
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Lihua Peng,Ziqing Xu,Luomeng Chao,Dapeng Zheng,Haibin Yang,Changwei Sun,Hongzhi Cui
Transparent heat-insulation glass (HIG) with a highly selective light-absorbing coating and an energy-storage blanket (ESB) loaded with phase change materials show considerable potential in reducing building energy consumption. However, the energy-saving effect of a single material is usually not ideal, and the instability of HIG and ESB limits their applications. In this work, HIG with enhanced stability and a form-stable ESB was prepared. The temperature difference between various indoor areas and energy consumption were reduced simultaneously because of the temperature regulation function of the HIG and ESB in the light and dark areas. Na x WO 3 @SiO 2 -coated HIG showed excellent daylighting and near-infrared-light-shielding ability with visible light transmittance of 71% and near-infrared light transmittance of 16%, respectively. Moreover, polyethylene glycol/halloysite nanotube composite phase change material with a high enthalpy of 71.1 J/g and a suitable phase change temperature of 27.5 °C was prepared for the form-stable ESB. The test room experiment indicated that the combination of the HIG and ESB (HIG–ESB) reduced the indoor temperature difference from 6.8 °C to 0.9 °C and the maximum temperature by 33–40%. The energy consumption simulation revealed that the ESB can save energy in all selected cities, whereas HIG is only applicable to cities in warm regions. HIG–ESB achieved the highest annual energy-saving rate of 43.9% in Hong Kong. The joint application of the HIG and ESB provides a new strategy for developing passive energy-saving buildings.
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SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Xiuhu Li,Rongrong Deng,Qibo Zhang
Cobalt-phosphorous (Co P) coatings are promising alternatives for hard chromium due to their outstanding corrosion protection . An excellent Co P coating can efficiently reduce the effects of a corrosive environment. Herein, Co P coatings with a tunable P content, ranging from 5.1 at.% to 20 at.%, are fabricated via a simple electrochemical deposition approach from choline chloride-ethylene glycol (Ethaline)-based deep eutectic solvent (DES) with saccharin (SA) as an additive. The rational introduction of SA induced the formation of close-growing Co P coatings rich in P on the substrate with reduced grain size and surface roughness . It turned out that the crystal structure of the deposited Co P coatings changed from a crystallized state to an amorphous state upon the addition of SA, which accelerated the nucleation rate of the nanocrystals and modified the nucleation model from progressive to instantaneous. The optimal Co P coating prepared exhibited excellent anti-corrosion and barrier protection properties for mild steel in corrosive NaCl solution, functioning up to 10 times better than its counterparts. Our work reveals the central role of additives in tailoring the structure and composition of the deposited Co P coatings in Ethaline-based DES and offers a new avenue for fabricating high-performance coating materials for anti-corrosion applications.
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高影响因子
SOLID STATE IONICS
·
2022
·
IF 3.699
Jingyu Ma,Xiaoyan Ma,Qi Zhang,Xinghua Guan,Fang Chen,Peiran Wang,Junling Huang
Poly(ethylene oxide) (PEO)-based solid polymer electrolyte (SPE), as a key component connecting the internal channels, can improve the safety performance for lithium secondary battery , but it is still challenged by limited ionic conductance due to high polymer crystallinity at room temperature . Here, we develop a SPE by blending PEO with star -shaped polymer of polyethylene glycol methyl ether methacrylate- co -polyhedral oligomeric silsesquioxane (POSS-(PPEGMEM) 8 ), which is synthesized by atom transfer radical polymerization (ATRP) under octa (2-bromoisobutyryloxyethyl sulfide) octasilsesquioxane (POSS-Br 8 ) as initiator and poly(ethylene glycol) methyl ether methacrylate (PEGMEM) as polymerization monomer . The unique star -shaped structure of POSS-(PPEGMEM) 8 is helpful to increasing the segmental motion by reducing the crystallinity of PEO polymer and supporting more ion transport channels to obtain higher ion conductivity. The mixed electrolyte containing 40% POSS-(PPEGMEM) 8 exhibits the highest ionic conductivity (1.4 × 10 −4 S cm −1 , 50 °C) with a Li + transference number of 0.51 and a wide electrochemical window (5.0 V vs. Li/Li + ) and a high mechanical strength . The LiFePO 4 ||Li battery , assembled with PEO/POSS-(PPEGMEM) 8 –40%, carries out 100 cycles at a current density of 0.1C, provides a stable reversible capacity of 129.4 mAh g −1 and a high capacity retention rate due to the high ratio of free volume of polymer electrolyte formed by the star-shaped POSS-(PPEGMEM) 8 , which indicates that PEO/POSS-(PPEGMEM) 8 has good application prospects in high-performance all-solid-state lithium secondary battery.
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高影响因子
危险品化学品经营许可证（带存储）