ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Chongyang Zhang,Xigui Yue,Jiashuang Luan,Peiyao Li,Shuling Zhang,Jun Liu,Guibin Wang
In light of the essential role of typical reinforced PEMs (Gore-SELECT®) in pursuing novel alternatives, we demonstrate for the first time the potent capability of pore-filled semi-crystalline poly (ether ether ketone) membranes that represent by far the most effective polymer materials for methanol blocking of direct methanol fuel cells. The stable structure of poly (ether ether ketone) matrixes contributes to a low swelling behavior so as to restrain the methanol permeation across membranes in high concentration methanol solutions. Porous matrixes are endowed with the ability to conduct protons by an inorganic modifier of phosphotungstate-ionic liquid. In order to improve the interaction of phosphotungstate-ionic liquid and inert matrixes, the porous matrix is pre-modified by a co-deposition reaction of polydopamine and polyethyleneimine. The anchored modifier of polydopamine and polyethyleneimine in the matrix decelerates the leakage of ionic liquid and phosphotungstate. The developed composite membrane performs a heightened proton conductivity up to 0.11 S cm −1 at 80 °C to benefit from the superior proton conductive capacity of the phosphotungstate-ionic liquid, and exhibits extremely low methanol crossover (4.5 × 10 −7 cm 2 s −1 ) and favorable selectivity (12.22 × 10 4 S s cm −3 ) compared to those of Nafion 117. Especially, an excellent single cell performance with a maximum power density of 107 mW cm −2 is carried out under 10 M methanol at 70 °C.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Zhenyu Bao,Weijiang Zhang,Yinglai Chen,Jiao Xu,Xianbao Cui
The densities and viscosities of BF 3 ·anisole and BF 3 ·phenetole complex were determined at T = (283.15 to 303.15)K under atmospheric pressure. The molar ratios of the complexes ranged from 0.0080 to 0.9588 for BF 3 ·anisole and 0.0090 to 0.9850 for BF 3 ·phenetole. The measured densities and viscosities of both complexes were well correlated by modified Guimarães' equation and extended Jones–Dole equation, respectively. The apparent molar volumes were calculated using densities, and the limiting partial molar volumes were obtained by regression analysis. Arrhenius-type equation was adopted to get viscous flow activation energy through data fitting of viscosity values.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yue Zhang,Junye Chen,Yuanrong Cheng,Shuo Han,Fei Xiao
The void-free deposition of small-sized and high-aspect ratio interconnect structures requires stronger suppressors than conventional polyethers. In this work, thioether was introduced into polyether to develop novel suppressors with improved adsorption on electrode. The structure of thioether-modified polyether can be easily tailored by choosing proper polyether and thiol compound, thus providing a simple way to regulate electrochemical properties of the suppressor. The electrochemical and copper filling performance related to the molecular structure of novel suppressors were systematically investigated. Thioether-modified polyether, which retains the strong polarizability of typical suppressor and exhibits high resistance to accelerator desorption, can significantly suppress copper deposition on feature sidewalls. This enabled defect-free filling of narrower features at a concentration much lower than the typical usage concentration of suppressor. The modified polyethers with ethylene-propylene-ethylene (EPE) oxide triblock ether chains exhibited higher polarization strength and concentration dependence, facilitating the higher deposition current at the bottom during filling. The length and block ratio of ether chain further influenced the anti-desorption ability of the modified polyether, thereby impacting their suppression on sidewalls, which is crucial in filling process. The convenient structural adjustments for thioether-modified polyether, combined with the derived structure-property relationship, contribute to the development of new suppressors with strong adsorption performance.
研究领域:
材料科学
·
电化学
·
半导体制造
✓ 已验证
产品关联
DOI
高影响因子
Acta Biomaterialia
·
2018
·
IF 6.383
Jianglong Yan,Wenhao Zhou,Zhaojun Jia,Pan Xiong,Yangyang Li,Pei Wang,Qiyao Li,Yan Cheng,Yufeng Zheng
Biomedical associated infections (BAI) are difficult to treat and may even lead to amputation and death, especially after the emergence of drug-resistant bacteria. The aim of this study was to harness the potential synergistic effects of multiple bactericidal agents to endow polyetheretherketone (PEEK) with the ability of achieving full eradication of planktonic and adherent bacteria while maintaining acceptable biocompatibility. In this work, a mussel inspired, silver nanoparticles (AgNPs) incorporated silk fibroin (SF)/gentamicin sulfate (GS) coating was constructed upon porous PEEK surface. The obtained coating greatly enhanced the bactericidal efficiency to Gram-positive bacteria and Gram-negative bacteria. The number of bacteria survived in the culture medium after treated with this coating was 10 6 fold lower than that survived after treated with PEEK sample, while the number of viable bacteria adhered to this coating was 10 5 lower than that adhered to PEEK sample. Furthermore, release of Ag + and GS increased with decreasing pH, indicating great potential of this coating to be a “smart” bacteria-triggered self-defensive coating. Meanwhile, this functional coating shows favorable cytocompatibility and osteogenic ability. The mechanism behind this dual function is also partially revealed. Expectedly, this “smart” dual function coating can give a promise for PEEK to become a solution to increasingly deteriorated BAI. Statement of Significance In this study, a mussel inspired, silver nanoparticles (AgNPs) incorporated silk fibroin (SF)/gentamicin sulfate (GS) coating was constructed upon porous polyetheretherketone (PEEK) surface. This design was aimed to provide a solution to the increasingly deteriorated biomedical associated infections (BAI). Actually, this design endowed PEEK with dual function: bacteria-triggered synergistic bactericidal effect and improved osteogenic ability. The combination of silver and GS exhibited synergistic bacteria killing effect on both Gram-positive and Gram-negative bacteria, which showed 10 6 times higher in releasing-killing and 10 5 times higher in anti-adhesion than that of untreated PEEK. Furthermore, release of bactericidal agents increased with decreasing pH, indicating great potential of this coating to be a bacteria-triggered self-defensive coating. More interestingly, this study revealed the mechanism of synergistic effect between silver and GS.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Biomaterials Research
·
2025
·
IF 9.6
Shiqing Ma,Shiyu Yao,Yumeng Li,Yilin Yang,Tianyi Tong,Hong Zheng,Beibei Ma,Pengfei Wei,Zhengyi Di,Bo Zhao,Jiayin Deng
Polyetheretherketone (PEEK) is considered to be a potential material for oral implants due to its elastic modulus being similar to that of human cortical bone. However, the poor antibacterial, anti-inflammatory, and osseointegration properties of bioinert PEEK have hindered its clinical application. Therefore, this study designed and constructed a pH-responsive PEEK implant with a bilayer core–shell zeolitic imidazolate framework-8 (ZIF-8) structure loaded on its surface, with an antimicrobial peptide (KR12) encapsulated in the outer shell and an osteogenic peptide (osteogenic growth peptide ) encapsulated in its inner core. In this study, the bilayer core–shell ZIF-8 structure was confirmed to have pH-responsive properties. In vitro studies proved that the implant could promote bone marrow mesenchymal stem cells’ proliferation and differentiation and the M1 phenotype to M2 phenotype conversion of RAW 264.7 and could inhibit bacterial adhesion and proliferation. By constructing rats’ distal femur with/without infection models, it was further demonstrated that the novel implant could effectively inhibit bacterial adhesion and growth, inhibit inflammation, and promote peri-implant osseointegration, which was more substantial when the local area was infected and the pH was lower than that of normal tissue. Collectively, the results suggest that this novel pH-responsive PEEK implant loaded with a bilayer core–shell ZIF-8 structure is a promising peptide delivery implant system, which is well suited for dental applications and offers a potential solution for the prevention of infection during the early phase after implantation.
研究领域:
生物材料
·
组织工程
·
牙科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Shiwen Zhang,Yang Zhang,Fan Zhang,Lulu Wang,Lingzhi Xiong,Shuanglong Xiao,Shaoji Wang,Jilin Wang
Crown ether, as a hydrophilic group, is capable of forming complexes with metal cations and serves as a key component for constructing supramolecular assemblies. This functionality allows it to dynamically capture anchor points, enhance ion aggregation, and improve the hydroxide conductivity. However, the high hydrophilicity of crown ether can lead to excessive swelling, which limits its application. Therefore, this study designs ether-free AEMs containing crown ether, m-terphenyls and piperidine through superacid-catalyzed synthesis, and are used in fuel cells. PMDTP-15 not only achieves efficient conduction of OH − (130.7 mS·cm −1 , 80 °C), but also effectively limits the swelling of the membrane (19.1 %, 80 °C) and exhibits excellent alkali stability (after being immersed in 1 M NaOH solution for 1680 h, the conductivity remained 95.34 %, and the mechanical properties decreased by 1.13 %) due to the high hydrophilicity and m-terphenyl torque structure of the crown ether structure. In addition, the peak power density of a single PMDTP-15 cell can reach 1043 mW·cm −2 , and the voltage can maintain 90 % of the original performance after 120 h.
研究领域:
材料科学
·
高分子化学
·
电化学
·
能源材料
·
膜科学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Advances
·
2024
·
IF 5.5
Dong Wang,Cuncai Jiang,Jun Li,Jiayi Guo,Jingxin Zhang,Fahai Ba,Yageng Li,Guo He
Porous polyetheretherketone (P-PEEK) is widely used as the material for making implant screws, and yet its mechanical properties and osseointegration for ultilization are still unsatisfied. In this work, the effects of the porosity distribution on the mechanical properties and osseointegration were investigated. Functionally graded P-PEEK (FGP-PEEK) and uniform P-PEEK (UP-PEEK) were developed by infiltration casting technology. The mechanical properties of the P-PEEK were studied by compressive and bending tests, and the osseointegration was evaluated by in vitro and rabbit femur experiments. The prepared FGP-PEEK was composed of the central dense part and its surrounding porous one where the pores were isodiametric and interconnected. Both the compressive strength and bending strength of the FGP-PEEK with graded porosity were higher than those of the UP-PEEK with uniform porosity. The mechanical properties of the FGP-PEEK were comparable to that of the human cancellous bone. The in vitro and in vivo experiments indicated the FGP-PEEK had no cytotoxicity, and its osseointegration was better than the UP-PEEK. The results demonstrated that the graded porosity had a superiority in the mechanical properties and osseointegration of the P-PEEK scaffolds compared to the uniform porosity. The influencing mechanisms of the porosity distribution on the mechanical properties and osseointegration were also clarified. Additionally, the osseointegration of the FGP-PEEK gradually increased as the surface porosity increased from 30 % to 50 %. The 50 %-surface porosity FGP-PEEK was a promising material on the application of the implant screws.
研究领域:
材料科学
·
生物医学工程
·
骨科
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Ying Wang,Yixin Luo,Rong Chen,Bingyao Sun,Hai Liu,Jie Wang,Chunli Gong,Quanyuan Zhang
As the core component of proton exchange membrane fuel cells (PEMFCs), the PEM serves as a channel for proton transport and a barrier for electrodes, ensuring efficient energy conversion and the integrity of the cell performance. Metal-organic frameworks (MOFs), with their hybrid organic-inorganic lattices, embody a paradigm of structural and chemical versatility, offering a promising avenue for PEM material innovation. In this work, a phosphorylated MOF (ZnL) synthesized from 1, 1′-piperazinedimethylene phosphate and zinc chloride was integrated into a cytosine-modified SPEEK matrix, yielding advanced composite PEMs. The composite enhanced thermal stability, and mechanical integrity and minimized swelling of the membranes. The incorporation of ZnL improved the proton conductivity, enhanced thermal stability and decreased methanol permeability. The strong interaction between the nucleobase and phosphoric acid in the membrane stabilized the acid, ensuring the membranes' stability and increasing proton conductivity. All PA-doped membranes exhibited satisfactory proton conductivity and mechanical properties. Notably, the SPEEK-C-1ZnL/PA membrane achieved a decomposition temperature of 230 °C and a maximum proton conductivity of 240.34 mS cm −1 . During direct methanol fuel cell (DMFC) testing, it demonstrated a power density of 70.67 mW cm −2 and maintained an open circuit voltage of 90.6% after 320 h. These results highlight the potential of this membrane for DMFC applications.
研究领域:
材料科学
·
能源工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Chi Zhang,Jiang-An You,Xue Wang,Rui Hou,Xiaofeng Li,Yuxuan Sun,Guorui Qin,Shenghai Li,Suobo Zhang
By examining the structural patterns of the imine monomers engaged in polycondensation, a series of poly(ether ether ketone) precursor polymers (PEEKi-N-acyl) modified with N-acyl Imine groups were designed in this work. Contrary to poly(ether ether ketone) (PEEK), these precursor polymers have superior solubility, enabling their production in solution and processing of membrane components. The membrane components’ substance could undergo an imine hydrolysis reaction in an acidic environment, turning them back into PEEK and giving them solvent resistance. In addition, the homogeneous polymer membranes of this series exhibit spontaneous pore formation under the action of ethanol, which was caused by solvent-induced internal stress relaxation. By utilizing the properties of this type of polymer, precursor polymers can be processed into PEEK sponge-like porous membranes, expanding the processing morphology and application range of PEEK.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Xinke Lv,Xuehong Wang,Songchao Tang,Dongliang Wang,Lili Yang,Axiang He,Tingting Tang,Jie Wei
To improve mechanical, tribological and biological performances of polyetheretherketone (PEEK) for artificial joints applications, molybdenum disulfide (MoS 2 , MS) nanosheets were incorporated into PEEK to fabricate MS/PEEK biocomposites (MPC) with MS content of 4 w% (MPC4) and 8 w% (MPC8). The results revealed that the MS nanosheets with the size of about 400 nm and sheet thickness of about 70 nm were distributed into PEEK matrix, and surface roughness as well as hydrophilicity of MPC increased with the MS content increasing. Moreover, the compressive strength and shore hardness of the MPC were accordingly enhanced. Furthermore, the coefficient of friction of the MPC decreased while the wear resistance of the MPC increased with the MS content increasing in both water-sliding and dry-sliding contact. In addition, rat bone marrow derived stromal cells adhered and proliferated on the composites, indicating that the MPC had no adverse influences on cell behaviors, indicating good cytocompatibility. The results demonstrated that incorporation of MS nanosheets into PEEK produced biocomposites with improved mechanical, tribological and biological performances. MPC8 with no cytotoxicity would have a great potential for artificial joints applications.
研究领域:
生物医学工程
·
材料科学
·
骨科医学
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Wanxing Xu,Tianyi Han,Chenhui Zhang
Water-lubricated bearings working at low velocity and high contact pressures face critical tribological challenges, especially the thinning and failure of the hydrodynamic water film leads to the direct contact of surface asperities, resulting in severe wear and friction noise. To solve these issues, this study designs an innovative hydrogel-microencapsulated polyether ether ketone (PEEK) composite through the combination of hydrogel microcapsules into the PEEK matrix. This water lubricated composite achieves a 64 % reduction in the coefficient of friction and a one-order-of-magnitude decrease in the wear rate, significantly enhancing the polymer's lubrication performance under severe operating conditions. The mechanism behind the lubrication enhanced performance is attributed to the in-situ formation of hydrogel lubricating films on the PEEK surface. This work proposes an innovative ‘rupture-grow’ lubricating strategy for developing polymer-based bearing materials to address critical tribological challenges.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Mingjin Tang,Yixuan Wang,Xiaoxuan Yang,Jianxin Xue,Lulu Wang,Shuai Wang,Jie Li,Chenfei Song,Huanhuan Lu,Xianjuan Pang,Beibei Chen,Yongzhen Zhang
In this study, the interfacial bonding between carbon fibers (CFs) and polyetheretherketone (PEEK) was enhanced via three modification strategies, namely, incorporation of multiwalled carbon nanotubes (MWCNTs) as filler, CF surface sizing with a polyethylenimine (PEI)-based agent containing MWCNTs, and CF functionalization using a polyamidoamine (PAMAM) coupling agent carrying MWCNTs. These approaches aimed at improving CF-PEEK compatibility through physical entanglement and chemical bonding. The addition of MWCNTs enhanced the mechanical interlocking, while amide bonds and π–π interactions in CF-PEI-MWCNTs/PEEK and CF-PAMAM-MWCNTs/PEEK systems further strengthened the interface. Designed for high-wear-resistance applications such as aerospace components and sliding bearings, the CF/PEEK composites were tested against GCr15 steel under dry friction conditions. Results showed that the CF-PEI-MWCNTs/PEEK composite exhibited superior mechanical and tribological performance compared to the MWCNTs-filled CF/PEEK system. The dominant wear mechanism was mild adhesive wear.
研究领域:
材料科学
·
机械工程
·
纳米技术
·
聚合物复合材料
✓ 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）