COLLOIDS AND SURFACES B-BIOINTERFACES
·
2016
·
IF 3.902
Peng Tian,Demin Xu,Xuanyong Liu
The rapid degradation of magnesium-based implants in physiological environments in vivo not only will quickly deteriorate their mechanical strengths but will also lead to a severe change of the micro-environment around the implants, which may cause the final failure of magnesium-based implants. In this work, a polycaprolactone (PCL) layer was prepared to seal the plasma electrolytic oxidization coating (PEO) to form a PEO/PCL composite coating on a biodegradable AZ31 magnesium alloy, followed by further surface functionalization with polydopamine. The in vitro degradation behaviors of the bare AZ31 alloy and coated samples were evaluated in a simulated body fluid (SBF) using the potentiodynamic polarization curve test and the static immersion test. The bioactivity of the samples was investigated using the SBF soaking test. The cytocompatibility of all samples was evaluated using the cytotoxicity test and analysis of the adhesion and proliferation of osteoblast cells (MC3T3-E1) directly cultivated on the sample surface. The results showed that the PCL layer successfully sealed the pores of the PEO coating, and then the polydopamine layer formed on its surface. The in vitro degradation tests showed that the PEO/PCL composite coating improved the corrosion resistance of the AZ31 alloy in SBF with a more positive corrosion potential and a lower corrosion current density. Due to the protection of the PEO/PCL composite coating, the surrounding environment showed nearly no influence on the degradation of the coated sample, which led to no obvious local alkalization and hydrogen evolution. Moreover, compared with the AZ31 alloy and PEO coating, the PEO/PCL composite coating was more suitable for cell adhesion and proliferation. After further surface functionalization by polydopamine, the corrosion resistance of the composite coating was maintained, while its bioactivity was significantly enhanced with a large amount of hydroxyapatite (HA) formed on its surface after immersion in SBF. The initial cell adhesion and spread were also improved by the polydopamine. By further immobilizing polyhexamethylene biguanidine (PHMB) onto the coating surface via the assistance of polydopamine, good antibacterial ability was obtained. This feasible method for fabricating a cytocompatible and antibacterial composite coating on a biodegradable AZ31 alloy may be promising in implant applications due to the osteointegration and anti-infection properties of these materials post operation.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 5
·050534
·
IF 3.1
Yi Zou,Yaozhong Chen,Tao Jiang,Songxue Shao,Mingjing Xiao,Yuetong Lv,Yuting Wang,Lvjin Gao,Li Chen,Wentao Zhao
It is popular to choose the cubic phase Li7La3Zr2O12(c-LLZO) to synthesize the PEO-based complex membrane in all-solid-state battery. In this work, Ba/Nb elements were selected to achieve Li6.75La3Zr1.75Nb0.25O12 (LLZNO) and Li7La2.75Ba0.25Zr1.75Nb0.25O12 (LLBZNO) with high ion conductivity, which effectively enhance the electrochemical properties of the complex solid membrane and the all-solid-state battery. The higher ion mobility of LLBZNO compared to that of LLZNO and LLZO is calculated by ab-initio molecular dynamics (AIMD) simulation and further confirmed by experiments. Results show that the cubic phase of LLBZNO is more stable than that of LLZNO. The complex membrane of LLBZNO@ polyethylene oxide (PEO) (CPE-2-x wt%) exhibits the better electrochemical properties than LLZNO@PEO (CPE-1-x wt%) complex membrane. In detail, the CPE-2–10 wt% has the outstanding lithium transfer number ({t}_{{{Li}}^{+}}) of 0.63, as well as the excellent compatibility with lithium metal anode. In addition, at 0.1 mAcm−2, the lithium/CPE-2–10 wt%/lithium symmetric cell remains stable after 1000 h. It is LLBZNO that makes LLBZNO@PEO composite polymer electrolyte(CPE) the potential for the application in all-solid-state lithium battery.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Coatings
·
2019
·Vol. 9
·期 12
·867
·
IF 2.33
Diping Zeng,Zhiyi Liu,Song Bai,Jian Wang
In the present work, a coating was prepared on an Al alloy substrate by plasma electrolytic oxidation (PEO). To seal the micro defects in the oxide scale, a siloxane layer was prepared on the PEO coating by sol gel method. The polymer sealant was synthesized from Tetraethoxy silane (TEOS) and methacryloxy propyl trimethoxyl silane (MPTES). The chemical structure of the polymer was studied by Fourier transform infrared spectroscopy (FTIR). The morphologies and microstructure of the PEO coating and siloxane coating were investigated by scanning electron microscopy (SEM). The results showed that siloxane formed a continuous layer on the surface and effectively sealed the micro defects. The corrosion behavior of the coatings in three different corrosion solutions (NaCl, HCl, and NaOH) was examined by electrochemical impedance spectroscopy and potentiodynamic polarization. The corrosion resistance of the sealed coatings was superior to that of the PEO coating because it prevented the penetration of corrosive solutions. The corrosion resistance of the sealed coatings was found to decrease with increasing electrolyte concentration. The work demonstrated that siloxane sealing may greatly enhance the corrosion resistance of Al-based PEO coating in acidic, neutral, and alkaline environments.Keywords:PEO coating;silane polymer;sealing treatment;corrosion resistance
研究领域:
材料科学
·
腐蚀工程
·
表面工程
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Jiayu He,Faqin Xie,Xiangqing Wu,Lang Li,Rui Luo,Hanming Yang,Shaoqing Wang
PEO composite coatings doped with ZrO 2 and MoS 2 particles were prepared on the surface of TC21 alloy using the PEO process. The morphologies and phase compositions of the coatings were analyzed using FE-SEM, TEM, XRD refinement and XPS. The tribological and self-lubricating properties of the coatings were investigated through fretting wear experiments. The results indicate co-doping reduced the friction coefficient by approximately 30 %. The co-doped coating demonstrated higher crystallinity, whereas the ZrO 2 coating contained a significant amount of amorphous material. The wear mechanisms of the coating included three-body abrasive, adhesive, and oxidative wear. The self-lubricating properties of the coating were derived from the presence of MoS₂ and the destruction and deformation of the coating surface during fretting wear.
研究领域:
材料科学
·
表面工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Junying Yin,Xin Xu,Sen Jiang,Yue Lei,Yunfang Gao
Solid-state lithium metal batteries (SSLMBs) with high safety and high energy densities draw widespread attention in recent years. Nevertheless, the intrinsic defects of the solid-state electrolyte (SSE) such as the poor compatibility with electrodes and low ionic conductivity hamper the application of SSMLBs. Herein, we introduce rigid two-dimensional hexagonal boron nitride (BN) nanosheets and flexible One-dimensional aramid nanofibers (ANFs) as bi-nanofillers into the polyethylene oxide (PEO)-based SSEs to fabricate a composite solid-state electrolyte (CSE) ANF-PEO-BN with network structure boosting the comprehensive performance of SSMLBs. ANF and BN with special properties and structures are prone to be dispersed homogeneously in the PEO matrix to build the ANF-PEO-BN electrolyte, whose rigid and flexible network structure ensures the formation of Li dendrites inhibited. Furthermore, the dissociation of lithium bis(trifluoromethanesulphonyl)imide (LiTFSI) is promoted and more ion transport channels are provided due to the strong affinity between Lewis acid centers of ANF/BN and Li + /TFSI − . As a result, the LiFePO 4 /Li batteries deliver high-capacity retention of 86% after 500 cycles and Li/Li cells stably cycle beyond 3300 h with small overpotential of 10 mV at 0.1 mA cm −2 /0.2 mAh cm −2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Changmei Lin,Honghui Zhao,Hai Huang,Xiaojuan Ma,Shilin Cao
Recently, cellulose paper based triboelectric nanogenerators (CPTENGs) has gained widely attention due to the development of wearable, green and miniaturized electronic products. Modification of cellulose fibers or paper is a feasible method to improve the output performance of CPTENGs, however, the simple and effective routes to improve the triboelectric property of cellulose paper still remain a challenge. Herein, we report a simple method to prepare PEO/cellulose composite paper (PEO/CCP) via mixing polyethylene oxide (PEO) with cationic cellulose fibers. Benefiting from amino groups and PEO, the composite paper exhibits higher triboelectric positive property and triboelectric charge density, thereby endowing PEO/CCP based TENG with outstanding output performance. The voltage, current and power density peak values of PEO/CCP based TENG exhibited linear relationship with amino groups content; in this instance, the performance of the TENGs can be readily adjusted by the amino groups. The voltage, current and power density of PEO/CCP based TENG can be up to 222.1 V, 4.3 μA, and 217.3 mW•m −2 , respectively. Moreover, a human-health detection device based on this TENG can monitor the physiological signals such as eye muscles, respiration, heart beat and wrist pulse, promising potentials for applications in human health-care.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Furui Ma,Yuxiang Liu,Xuanru Du,Qingqing Lu
The development of excellent performance solid-state electrolytes (SSEs) is essential for high-energy solid-state lithium batteries . Herein, solid state composite electrolyte consisting of NASICON particles and PEO-LiTFSI was prepared through a solvent-free procedure. The assembled LFP / PEO-LATP / Li all-solid-state battery can present an initial capacity of 153.8 mA h g −1 and exhibit excellent electrochemical stability with a high capacity retention ratio of 95% after 100 cycles at 60 °C. In addition, a small amount of ionic liquid (IL) was added into hybrid solid electrolyte (HSE) to enhance the interface contact and improved the room temperature performance. Surprisingly, the assembled LFP / HSE / Li battery exhibits a stable discharge capacity of 157.6 mA h g −1 at 25 °C when the content of IL is 3%. The capacity retention can be reached 97.8% over 150 cycles at 60 °C. All the results show that assembled cells with HSE revealed an improved electrochemical performance .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Mengdie Yan,Chenlu Xu,Yang Sun,Huilin Pan,Hong Li
The reaction kinetics, reversibility and long-term stability of Zn anodes are crucial for rechargeable aqueous Zn batteries . Polymer electrolyte additives are low cost and effective to modify the deposition behavior of Zn anodes. Here, an interesting phenomenon appears that cycling stability and Coulombic efficiency of Zn anodes are improved by PEO additive in dilute aqueous electrolytes with different Zn salts, while the overpotential and long-term stability of Zn anodes vary significantly with different anions. Systematic electrochemical analysis coupled with NMR and MD simulation was performed to reveal the crucial role of salt anion in tuning the specific solvation structures and hydrogen bonding network of aqueous electrolytes with PEO additive, and interfacial double layer capacitance structures. The reaction kinetics and stability of Zn anodes were, therefore, intensively tuned by salt anions in aqueous electrolytes with PEO additives. The cycle life of Zn anode can be improved by 7–10 times with significantly reduced overpotential in bulky anion such as TFSI - based aqueous electrolyte than compact anion such as SO 4 2- in PEO containing aqueous electrolytes. This work provides useful and low-cost concepts to effectively improve Zn anodes reaction dynamics and cycle life by choosing optimal electrolyte salts and additives.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Fangli Deng,Xiaoen Wang,Dan He,Ji Hu,Chunli Gong,Yun Sheng Ye,Xiaolin Xie,Zhigang Xue
A novel microporous polymer electrolyte (MPE) based on poly (vinylidene fluoride) (PVDF)/poly (ethylene oxide) (PEO) star polymer was prepared by a phase inversion technique. The effects of PEO chain length of star polymer and temperature on ionic conductivity of MPE were investigated. The results showed that the ionic conductivity increased generally with the chain length of star polymer arms without any abrupt change. Effects of star polymer mass fraction on electrolyte uptake and leakage were also discussed. The distribution of holes and connectivity was improved with star polymer mass fraction increased, thus resulted in a high ionic conductivity (3.03×10 −3 S cm −1 ) exhibited at room temperature. Moreover, the electrochemical stability window was observed above 5.0 V (vs. Li/Li + ). All these results showed that this MPE could be served as a good candidate for lithium ion batteries .
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 35
·2310547
·
IF 13
Pengfei Zhai,Shuangquan Qu,Niaz Ahmad,Ze Hua,Ruiwen Shao,Wen Yang
The interfacial instability between PEO-based solid electrolyte (SPE) and high-voltage cathode materials inhibits the longevity of high-energy-density all-solid-state polymer lithium metal batteries (ASSPLBs). Herein, for the first time it is demonstrated, that contact loss caused by gas generation from interfacial side reactions between the high-voltage cathode and solid polymer electrolyte (SPE) can also arise in ASSPLBs. To alleviate the interfacial side reactions, a LiNb 0.6 Ti 0.5 O 3 (LNTO) layer is well coated on LiNi 0.83 Co 0.07 Mn 0.1 O 2 (NCM83), denoted as (CNCM83). The LNTO layer with low electronic conductivity reduces the decomposition drive force of SPE. Furthermore, Ti and Nb in the LNTO layer spontaneously migrate inside the NCM83 surface to form a strong Ti/Nb─O bond, stalling oxygen evolution in high-voltage cathodes. The interfacial degradation phenomena, including SPE decomposition, detrimental phase transition and intragranular cracks of NCM83, and void formation between cathode and SPE, are effectively mitigated by the LNTO layer. Therefore, the growth rate of interfacial resistance (R CEI ) decreases from 37.6 Ω h −0.5 for bare NCM83 to 2.4 Ω h −0.5 for CNCM83 at 4.2 V. Moreover, 4.2 V PEO-based ASSPLBs achieve impressive cyclability with high capacity retention of 135 mAh g −1 (75%) even after 300 cycles at 0.5 C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Shidong Song,Junjie Ma,Huanlei Zhao,Phumlani F. Msomi,Jiahao Ren,Yanan Liu,Run Ma,Wanyu Ye
In terms of stability and safety, quasi-solid-state lithium-oxygen batteries (QSSLOBs) outperform traditional liquid LOBs. However, using redox mediators (RMs) in QSSLOBs requires unique strategy to inhibit the shuttle effect of RMs. In this work, a PEO-based oxygen electrode with anchored 4-OH-TEMPO (4-hydroxy-2,2,6,6-tetramethyl-piperidinyloxy) RM (referred to as TEMPO-PEO) is developed via hydrogen-bonding interaction for QSSLOBs. The TEMPO-PEO oxygen electrode can perform both significant mediation function and oxygen reduction reaction (ORR) activity. The QSSLOB using TEMPO-PEO electrode achieves a low discharge/charge voltage gap of 0.9 V and a high Coulombic efficiency of 96.8 %, which is significantly superior to the counterparts using TEMPO solution (TEMPO cell) or unanchored TEMPO (TEMPO+PEO cell). On this basis, the TEMPO-PEO cell achieves an unprecedented cycle performance for 320 cycles under the limited capacity of 300 mAh g −1 , overwhelmingly outperforming the counterpart cells that only deliver 63 cycles (TEMPO cell) and 119 cycles (TEMPO+PEO cell), respectively. After cycling, the TEMPO RM can still be well retained on TEMPO-PEO oxygen electrode and no significant side product is formed on the after-cycled Li anode of TEMPO-PEO cell, explicitly demonstrating a strong and consistent anchoring effect on suppressing the shuttling of RM species.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Shuai Zhang,Yinlong Ma,Sixu Zhao,Wenhao Dai,Baochang Liu
A modified cerium seal PEO pretreatment was developed on 2A14 alloy and combined with an epoxy coating (EP) to form a duplex coating system. The PEO coating was effectively sealed by cerium hydroxides and oxides , and also acted as a controlled release vessel for the cerium salt corrosion inhibitor , and significantly improved the adhesive strength of the EP. The results of electrochemical tests and immersion experiments show that the coating system pretreated with the modified cerium seal PEO exhibits excellent long-term corrosion resistance and active protection. This is attributed to the physical barrier of insoluble cerium-based compounds and sensitive pH-responsive deposition.
研究领域:
材料科学
·
电化学
·
防腐蚀工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）