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Influence of Current Density on the Photocatalytic Activity of Nd:TiO_(2) Coatings

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 32-38页

作者：施渊吉 ZHANG Zhen DAI Yunzhong LI Jingxiao CHEN Zeyu School of Mechanical Engineering Nanjing Vocational University of Industry TechnologyNanjing 210046China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Key Laboratory of Modern Agricultural Equipment and Technology Jiangsu UniversityZhenjiang 212013China

The Nd:TiO_(2 )peo coatings were formed in a phosphate-based electrolyte with the addition of Nd_(2)O_(3 )under the current density of 150,200,250 and 300 m A/cm^(2).SEM results showed that the micropores decreased on quantity and increased on scale with the increasing current density.AFM results revealed that the roughness of the coatings increased with the increasing current density.Phase and composition analysis showed that the Nd:TiO_(2) coatings were mainly composed of anatase and rutile phase.And the anatase phase content has reached the maximum value at the current density of 250 m A/cm^(2).XPS results indicated that Ti2p spin-orbit components of the Nd:TiO_(2) coatings are shifted towards higher binding energy,compared with the pure TiO_(2) coating,suggesting that some of the Nd^(3+)ions are combined with TiO_(2) lattice and led to dislocation.Photocatalytic test showed that the photocatalytic activity of Nd:TiO_(2) coatings varied in the same pattern with the anatase content variation in Nd:TiO_(2) coatings.The photocatalytic experiment results show that the photocatalytic activity of Nd:TiO_(2) coatings can be greatly enhanced with moderate amount of Nd^(3+).However,excessive amount of Nd^(3+)does not have an effective impact on the photoctalytic activity improvement.

关键词： peo current density AFM XPS Nd:TiO_(2) photocatalytic

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Reducing damage extent of epoxy coating on magnesium substrate by Zr-enhanced peo coating as an effective pretreatment

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Journal of Magnesium and Alloys 2023年第2期11卷 641-656页

作者： Z.Jamshidipour M.Toorani M.Aliofkhazraei M.Mahdavian Department of Materials Engineering Tarbiat Modares UniversityTehranIran Department of Surface Coatings and Corrosion Institute for Color Science and Technology(ICST)TehranIran

This research was undertaken to study the effect of Zr-enhanced plasma electrolytic oxidation(peo) as a pretreatment on the corrosion performance of epoxy coating applied on Magnesium in 3.5 wt.% Na Cl solution. The parameters of delamination index along with coating damage index were extracted through electrochemical impedance spectroscopy(EIS) tests to determine how Zr may affect the corrosion protection of duplex peo/epoxy coated samples. Pull-off adhesion tests were also accomplished to form a better understanding of Zr-enhanced peo coating’ function. According to the obtained results, the presence of Zr can reduce the damage to the coating system by almost twice.

关键词： Magnesium EIS Pretreatment peo Epoxy Zirconyl nitrate

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Impressive strides in amelioration of corrosion and wear behaviors of Mg alloys using applied polymer coatings on peo porous coatings:A review

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Journal of Magnesium and Alloys 2022年第5期10卷 1171-1190页

作者： Arash Fattah-alhosseini Razieh Chaharmahali Kazem Babaei Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

Magnesium(Mg)and its alloys have received much attention in a lot of areas due to their special chemical and physical properties.Nevertheless,high corrosion rates are a limiting factor.The plasma electrolytic oxidation(peo)technique is a simple approach to place an oxide film on the surface of light metals like Mg alloys.This method has been considered for controlling the rate of corrosion and improving some other properties.On the other hand,peo coatings cannot make enough protection of Magnesium alloys for a long time due to porosity and fine cracks.Therefore,peo-based composite coatings are used to make adequate corrosion protection on the Mg alloys surface.The popularity of these coatings is due to their good corrosion resistance,simplicity,high coating capability,and cost-effectiveness in complex segments.Formation of an organic layer on the surface of peo coating is one of the effective methods to close the defects and thus prevent the corrosive species penetration into the substrate.Coating the peo coating with a polymer layer can be a good solution to control the amount of damage and improve the corrosion and abrasion resistance.In addition,peo coating can eliminate the problems of insufficient adhesion of polymer coatings and is considered as a suitable base for composite coatings.This review paper presents the corrosion and abrasion behavior of the peo/Polymer dual coating system on Mg alloys.Given the fundamental role of coatings thickness and morphology in wear and corrosion behavior,these aspects have been highly discussed in this study.

关键词： Composite coating Mg alloys peo Polymer Corrosion properties Wear resistance

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Fabricating a PVDF skin for peo-based SPE to stabilize the interface both at cathode and anode for Li-ion batteries

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Journal of Energy Chemistry 2022年第7期31卷 356-362,I0010页

作者： Qi Ye Haoyue Liang Shuhao Wang Can Cui Cheng Zeng Tianyou Zhai Huiqiao Li State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Poly(ethylene oxide)(peo)-based solid polymer electrolyte is always the most promising candidate for preparing thinner, lighter and safer lithium-ion batteries. However, the lithium dendrites growth of lithium anode and the high-voltage oxidation of cathode are easy to cause the peo-based battery failure.The way to deal with the different challenges on both sides of the anode and cathode is pursued all the time. In this study, we reported a new strategy to construct the PVDF/peo/PVDF three-layer structure for solid polymer electrolyte(marked as PVDF@peo) using PVDF as the functional “skin”. The PVDF@peo electrolyte can effectively prevent from the lithium dendrites, and shows a stable cycling life over1000 h in the Li/PVDF@peo/Li cell. In addition, the PVDF@peo electrolyte exhibits higher oxidation resistance and can be matched with high-voltage LiCoO_(2) cathode. The Li/PVDF@peo/LiCoO_(2) cell delivered a specific capacity of about 150 m Ah g^(-1) over 150 cycles and maintained good cycling stability. Our research provides insights that the polymer electrolytes constructed with PVDF functional “skin” can simultaneously meet the challenges of both anode and cathode in solid-state lithium-ion batteries(SSLIBs).

关键词： PVDF peo Solid-state lithium-ion batteries Cathode Anode

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Deep eutectic solvent-based polymer electrolyte for solid-state lithium metal batteries

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Journal of Energy Chemistry 2022年第7期31卷 363-372,I0010页

作者： Panpan Dong Xiahui Zhang Kee Sung Han Younghwan Cha Min-Kyu Song School of Mechanical and Materials Engineering Washington State UniversityWA 99164United States Materials Sciences Pacific Northwest National LaboratoryWA 99352United States

Poly(ethylene) oxide(peo)-based electrolytes have been widely studied for solid-state lithium batteries while their ionic conductivity and lithium-ion transference number still need to be further improved.Herein, using the combined experimental and theoretical approach, we demonstrate a novel, solidstate peo-deep eutectic solvent(DES) electrolyte for the first time. We found that the in situ formation of DES can reduce the crystallinity of peo matrix and more Li+ions can move freely owing to the weakened coordination between ether oxygens and Li-ions. Besides, we show that more Li+ions can be dissociated from Li salts in peo-DES electrolyte using the molecular dynamics simulations. Such liquid-free peo-DES electrolytes showed good ionic conductivity(2.1 × 10^(-4) S cm^(-1)) which is 160% higher than that of conventional peo-Li TFSI(8.1 × 10^(-5) S cm^(-1)) electrolyte at 60 ℃. Additionally, the peo-DES electrolyte showed 136% increase of Li-ion transference number(0.33) compared with ionic liquid-doped peo-Li TFSI(0.14) at 60 ℃. Moreover, the peo-DES exhibited good compatibility with Li metal and stable Li plating/stripping behavior with little morphology change of Li metal. This research also provides new insights into the enhancement mechanisms of novel polymer electrolytes, improving our fundamental understanding of critical challenges that have impeded the adoption of solid-state lithium metal batteries.

关键词： Deep eutectic solvent Li metal batteries peo Solid-state electrolytes Li plating/stripping

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Crystallization Behavior of Disproportionately High and Low Molecular Weight peo Blends

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Chinese Journal of Polymer Science 2014年第9期32卷 1199-1209页

作者： Li Li Jun-teng Liu Zhong-jie Ren 闫寿科 Department of Chemistry and Chemical Engineering Heze University Beijing Key Laboratory of Membrane Science & State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

The crystallization behavior of peos with molecular weight of 1 Ok and 200k as well as their blends was studied in details. The results show that the lower molecular weight peo crystallizes with faster crystallization rate as judged from a shorter time for completing the crystallization. On the other hand, the higher molecular weight peo crystallizes at relatively higher temperature, indicating an early start of crystallization compared with the lower molecular weight one. The blends of these two peos with different blend ratios always cocrystallize during the cooling processes. It is confirmed that mixing of the 10k peo with the 200k one is in favor of the crystallization of the system. This is not only demonstrated by the early start of the crystallization at higher crystallization temperature, and also a faster crystal growth of the blend with respect to the 200k peo. The crystallization of the blends at higher temperature is caused by an early start of nucleation and an increment of nucleus density. This may originate from the density fluctuation of the blend and a reduction in energy barrier for nucleation. Moreover, it is found that the crystallinity of the 1 Ok peo rich blends increases with increasing concentration of the 10k peo. This is caused by the solvent effect of the 10k peo toward the 200k peo. On the other hand, the crystallinity of the 30/70 （10k/200k） peo blend is decreased a little bit. This may be a balanced result of the improved crystallization of the 200k peo at the expense of the high crystallization ability of the 1 Ok peo.

关键词： peo Molecular weight Blend Crystallization Morphology.

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INTERACTION BETWEEN POLY (ETHYLENE OXIDE) AND SILICA NANOPARTICLES IN DILUTE SOLUTIONS

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Chinese Journal of Polymer Science 2013年第9期31卷 1290-1298页

作者： Da-peng Wang Mu-quan Yang Zhi-xin Dong Shu-qin Bo Xiang-ling Ji State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

A mixed system that includes poly（ethylene oxide）（peo） and silica （SiO2） nanoparticles is prepared using two mixing methods. The interaction between peo and the SiO2 nanoparticles in the dilute basic solution is investigated using the dynamic tight scattering （DLS） and isothermal titration calorimetry （ITC） techniques. The DLS results show qualitatively that SiO2 nanoparticles interact with both random coils and aggregates of peo through hydrogen bonding, and peo-SiO2 complexes are formed. The degree of disaggregation of aggregates of peo is readily adjusted by changing the concentration of SiO2 nanoparticle suspensions. Moreover, the ITC results also certify quantitatively the interaction between peo and SiO2 nanoparticle, and give the evidence of formation of peo-SiO2 complex.

关键词： peo SiO2 nanoparticles Hydrogen bonding Disaggregation Mixing method Depletion interaction.

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MICROSTRUCTURE EVOLUTION OF ISOTACTIC POLYPROPYLENE DURING ANNEALING:EFFECT OF POLY(ETHYLENE OXIDE)

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Chinese Journal of Polymer Science 2012年第2期30卷 199-208页

作者：王勇 Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science & Engineering Southwest Jiaotong UniversityChengdu 610031China

The microstructure evolution of isotactic polypropylene （iPP） during annealing is reported. A few amount of poly（ethylene oxide）（peo） which exhibits much lower melt temperature compared with iPP was introduced into iPP in this work. The crystalline structure of iPP was detected using differential scanning calorimetry （DSC） and wide-angle X-ray diffraction （WAXD）, and the relaxation of iPP was characterized using dynamic mechanical analysis （DMA）. The variation of peo morphology was investigated by scanning electron microscopy （SEM）. The results show that the crystallization, including the primary crystallization and second crystallization during annealing, as well as the relaxation of iPP matrix is promoted with the presence of peo.

关键词： iPP peo Annealing Crystalline structure Relaxation.

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BLUE LIGHT-EMITTING COIL-ROD-COIL BLOCK OLIGOMERS WITH RIGID p-HEXAPHENYL AS CHROMOPHORE

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Chinese Journal of Polymer Science 2006年第2期24卷 115-124页

作者：宛新华 Key Laboratory of Polymer Chemistry and Physics of Education Ministry College of Chemistry and Molecular Engineering Peking University

The synthesis and characterization of coil-rod-coil triblock oligomers, poly（ethylene oxide）-b-p-hexaphenyl-b- poly（ethylene oxide）, are described. The number of repeating ethylene oxide units in each flexible block are 3 （EO3-PHP- EO3）, 8 （EOs-PHP-EO8）, 13 （EO13-PHP-EO13）, and 17 （EO17-PHP-EO17）, respectively. The structures of these oligomers are confirmed by ^1H-NMR, 13C-NMR, EA, and MALDI-TOF mass spectrometry. The introduction of soluble poly（ethylene oxide） coils to the rigid p-hexaphenyl segment significantly improves the solubility of the oligomers, so they can form smooth thin films by spin-coating from their solutions. The oligomers are quite thermally stable and have 1% weight loss temperatures at above 340℃ under nitrogen. They can emit strong blue light in both solution and film state, and have fluorescence quantum yields of about 40% in chloroform. They are expected to have potential applications in optoelectronic devices.

关键词： peo PHP Block oligomers MALDI-TOF Fluorescence

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A pH-and temperature-sensitive macrocyclic graft copolymer composed of peo ring and multi-poly(2-(dimethylamino) ethyl methacrylate) lateral chains

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Science China Chemistry 2010年第8期53卷 1653-1662页

作者： PANG XinChang,JING RongKuan,PAN MuGang & HUANG JunLian Key Laboratory of Molecular Engineering of Polymers,Ministry of Education Department of Macromolecular Science,Fudan University,Shanghai 200433,China Key Laboratory of Molecular Engineering of Polymers Ministry of Education Department of Macromolecular Science Fudan University Shanghai China

A novel method for the synthesis of macrocyclic graft copolymers was developed through combination of anionic ring-opening polymerization (AROP) and atom transfer radical polymerization (ATRP).A linear α,ω-dihydroxyl poly(ethylene oxide) with pendant acetal protected hydroxyl groups (l-poly(EO-co-EEGE)) was prepared first by the anionic copolymerization of ethylene oxide (EO) and ethoxyethyl glycidyl ether (EEGE).Then l-poly(EO-co-EEGE) was cyclized.The crude cyclized product containing the linear byproduct was hydrolyzed and purified by being treated with α-CD.The pure cyclic copolymer [c-poly(EO-co-Gly)] was esterified by reaction with 2-bromoisobutyryl bromide,and then used as ATRP macroinitiators to initiate polymerization of 2-(dimethylamino) ethyl methacrylate (DMAEMA),and a series of pH-and temperature-sensitive macrocyclic graft copolymers composed of a hydrophilic peo as the ring and PDMAEMA as side chains (c-peo-g-PDMAEMA) were obtained.The behavior of pH-and temperature-sensitive macrocyclic copolymers was studied in aqueous solution by fluorescence and dynamic light scattering (DLS).The critical micellization pH values of macrocyclic graft copolymers and their corresponding linear graft copolymers (l-peo-g-PDMAEMA) were measured.Under the same conditions,the cyclic graft copolymer with the shorter side chains gave the higher critical micellization pH value.The c-peo-g-PDMAEMA showed the lower critical micellization pH value than the corresponding l-peo-g-PDMAEMA.The average hydrodynamic diameters (Dh) of the micelles were measured by DLS with the variation of the aqueous solution pH value and temperature.

关键词： macrocyclic peo anionic ring-opening polymerization ATRP PDMAEMA pH-and temperature-sensitive

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