JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Ao Nan Lai,Dong Guo,Chen Xiao Lin,Qiu Gen Zhang,Ai Mei Zhu,Mei Ling Ye,Qing Lin Liu
Development of anion exchange membranes (AEMs) with high hydroxide conductivity, good dimensional and alkaline stabilities is still a challenge for the practical application of AEM fuel cells. In this study, we report a new strategy to prepare high-performance AEMs with crosslinked ionic regions. A series of phenolphthalein-containing poly(arylene ether sulfone)s crosslinked AEMs was synthesized by grafting ion groups selectively and densely on the phenolphthalein units to form ion clusters that are further crosslinked to generate the hydrophilic ionic regions. The crosslinking reaction not only improved the dimensional stability of the AEMs, but also increased the aggregation of the ion clusters leading to the formation of hydrophilic/hydrophobic phase-separated morphology and ion-conducting channels. As a result, enhancements in both ion conductivity and dimensional stability can be achieved. The crosslinked AEMs showed high hydroxide conductivities in the range of 52.2–143.4 mS cm −1 from 30 to 80 °C and a superb ratio of relative conductivity to relative swelling at 80 °C. Furthermore, the crosslinked AEMs also exhibited good mechanical properties , thermal and alkaline stabilities and desirable single cell performance. This work presents a promising strategy for the synthesis of high-performance AEMs for fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Daguang Li,Jiahao Cui,Yanhui Dong,Hao Cui,Dan Zhao,Weiping Qin
In order to improve the multi-ion cooperative transition, we proposed and exploited a novel nanoscale effect, namely the nanoshell effect in bulk materials. Based on the effect, an optimal material structure was designed by coating the surfaces of CaF 2 :Yb 3+ micron size particles with ZrO 2 . An about 2 times higher intensity of cooperative luminescence is observed upon laser excitation at 980 nm. Dynamical analysis exhibits that the novel effect plays a key role in improving the performance of cooperative transitions. Our results also suggest that the nanoshell effect in bulk materials is likely to be significant in some special cases, which have not been reported yet in the literature.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
·
2024
·
IF 3.9
Haide Dong,Lin Qiu,Chen Zhu,Wuzhe Fan,Li Liu,Quanfu Deng,Huan Zhang,Weihu Yang,Kaiyong Cai
Dental enamel is a mineralized extracellular matrix, and enamel defect is a common oral disease. However, the self-repair capacity of enamel is limited due to the absence of cellular components and organic matter. Efficacy of biomimetic enamel mineralization using calcium phosphate ion clusters (CPICs), is an effective method to compensate for the limited self-healing ability of fully developed enamel. Preparing and stabilizing CPICs presents a significant challenge, as the addition of certain stabilizers can diminish the mechanical properties or biosafety of mineralized enamel. To efficiently and safely repair enamel damage, this study quickly prepared CPICs without stabilizers using the atomization method. The formed CPICs were evenly distributed on the enamel surface, prompting directional growth and transformation of hydroxyapatite (HA) crystals. The study revealed that the mended enamel displayed comparable morphology, chemical composition, hardness, and mechanical properties to those of the original enamel. The approach of repairing dental enamel by utilizing ultrasonic nebulization of CPICs is highly efficient and safe, therefore indicating great promise.
研究领域:
口腔医学
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材料科学
·
生物矿化
✓ 已验证
DOI
PubMed
高影响因子
Light-Science & Applications
·
2014
·Vol. 3
·期 8
·e193
·
IF 8.476
Qin Wei-Ping,Liu Zhen-Yu,Sin Chol-Nam,Wu Chang-Feng,Qin Guan-Shi,Chen Zhe,Zheng Ke-Zhi
Cooperative luminescence (CL) occurs in spectral regions in which single ions do not have energy levels. It was first observed more than 40 years ago, and all results reported so far are from a pair of ions. In this work, upconverted CL of three Yb 3+ ions was observed in the ultraviolet (UV) region under near-infrared (NIR) excitation. The UV CL intensity showed a cubic dependence on the NIR pump power, whereas the luminescence lifetime was nearly one-third the luminescence lifetime of single Yb 3+ ions. The triplet CL (TCL) has a clear spectral structure, in which most emission peaks are consistent with the self-convoluted spectra from single Yb 3+ ions. Blue shifts were observed for certain peaks, indicating complex interactions among the excited Yb 3+ ions. The probability of the TCL process versus the average distances among three Yb 3+ ions was derived via the first- and second-order corrections to the wave functions of lanthanide ions, indicating that the formation of Yb 3+ clusters containing closely spaced ions favors the occurrence of the multi-ion interaction processes. Furthermore, the cooperative sensitization of one Gd 3+ ion by four excited Yb 3+ ions (Yb 3+ -tetramer) was demonstrated experimentally, which exhibited a novel upconversion mechanism—cluster sensitization. Our results are intriguing for further exploring quantum transitions that simultaneously involve multiple ions.
研究领域:
光学材料
·
稀土发光
·
量子光学
·
纳米光子学
·
固体发光
✓ 已验证
DOI
高影响因子
Advanced Science
·
2021
·Vol. 8
·期 16
·2100320
·
IF 16.806
Haiquan Zhang,Zijing Liu,Junping Mai,Ning Wang,Houji Liu,Jie Zhong,Xianmin Mai
Elastic hydrogel is a promising material category for designing biological muscles, repairable building materials, flexible electronic devices, and vulcanized rubber substitutes, which is required to have a long life, good self-healing performance and extreme temperature tolerance. Herein, a super-elastic mineral hydrogel is developed with long-lasting moisture, based on dynamic physical crosslinking between hydrated calcium ion clusters and amide groups of polyacrylamide (PAM). The complex hydrogel exhibits a super stretchability of 13 600% at room temperature, and can maintain the super flexibility in a wide temperature range of −40–50 °C or for a long period of 28 days. Particularly, the soft material cannot be ignited under an open flame at 400–500 °C, because of coupling dual flame retardant mechanisms containing the endothermic effect of liquid water evaporation and the barrier effect of calcium mineral salt on oxygen. In conclusion, the novel complex hydrogel with excellent tensile property, stability in extreme temperature or long operating time, and flame retardancy may become a promising candidate in the fields of agriculture, food, construction, medicine, and machinery.
研究领域:
材料科学
·
生物工程
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Ruonan Liu,Kun Chen,He Liu,Yiying Liu,Rong Cong,Jinhong Guo,Ye Tian
A hydrogel strain sensor can successfully transform its deformation into resistance changes, offering novel options for the Internet of Things (IoT) and artificial intelligence (AI). However, it remains challenging to prepare hydrogel sensors with superior performance (e.g., high conductivity). Here, we produced a conductive hydrogel (named PPC hydrogel) utilizing only three components, PVA (poly(vinyl alcohol)), PAAS (polyacrylate sodium), and CaCl2, through freezing cross-linking and ion chelation. The PPC hydrogel is endowed with high electrical conductivity of approximately 5.2 S/m without the addition of highly conductive materials due to the unique ionic cluster mesh structure, thus enabling an outstanding performance of strain sensing. The PPC hydrogel also maintains electrical conductivity in frozen and underwater conditions and resists swelling in underwater environments, allowing it to be used under water for extended periods of time (more than 15 days). The PPC hydrogel-based strain sensor can be used as a flexible electrode for electrocardiogram (ECG) and electromyogram (EMG) examinations and sensitively monitor human activity as well as recognize handwriting. Moreover, we designed a python-based visualization program combined with a PPC hydrogel array to implement pressure-sensing digital image mapping for remote IoT monitoring. As a flexible sensor for biosafety, the PPC hydrogel has potential applications in the field of intelligent sensing, the IoT, and even Internet of Body systems.
研究领域:
生物医学工程
·
材料科学
·
物联网技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Zihan Qu,Hong Wu,Yue Zhou,Leixin Yang,Xingyu Wu,Yingzhen Wu,Yanxiong Ren,Ning Zhang,Yutao Liu,Zhongyi Jiang
Membranes with fast CO 2 transport pathways have attracted intense attention due to their outstanding CO 2 permeability, showing potential for industrial application. Regulating the spatial distribution of CO 2 -philic groups in polymer-based membranes is expected to be a promising strategy to achieve the fast CO 2 transport pathways. In membrane matrix, the interconnected network of concentrated domains of CO 2 facilitated transport groups provides membranes with specific CO 2 transport pathways and finally leads to their high separation performance. In this study, a novel kind of polyelectrolyte membrane, quaternary ammonium polysulfone with interconnected ionic clusters, is prepared to enhance the CO 2 permeability. The hydrophilic quaternary ammonium groups tend to aggregate spontaneously to create ionic clusters. Furthermore, under humidified conditions, these ionic clusters are connected by water to form an ionic cluster network in the membrane matrix. The ionic cluster network plays the crucial role in accelerating the selective transport for CO 2 molecules over CH 4 by the reversible interaction between CO 2 and ion pairs. By tuning the quaternization degree of polysulfone, a series of polyelectrolyte membranes with different size of ionic clusters were developed. Membranes with hydrated ionic clusters (5–9 nm) show dramatic enhancement in CO 2 separation performance, especially in CO 2 permeability. The as-prepared quaternary ammonium polysulfone membrane with 8.98 nm ionic clusters exhibited the high CO 2 permeability of 1109.44 Barrer and a high CO 2 /CH 4 selectivity of 29.70, which exceeds 2008 Robeson upper bound limit. The optimized separation performance of QA-PSf membranes is attractive for potential application such as CO 2 capture from flue gas and natural gas.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Ziwei Dong,Mengting Di,Lei Hu,Li Gao,Xiaoming Yan,Xuehua Ruan,Xuemei Wu,Gaohong He
A novel hydrophilic/hydrophobic bi-comb-shaped amphoteric membrane was for the first time designed by the one-pot reactions of PBI with bromohexane and 1,3-propanesultone. The sulfonic acid chain promotes the formation of amphoteric ion clusters, while the alkyl side chain enhances the packing of hydrophobic segments. This unique structure design optimizes the segregated microphase morphology of the membrane, which is proved by TEM. Compared to the membrane without alkyl side chain, the bi-comb-shaped membrane shows a lowered area resistance (0.58 vs. 0.96 Ω cm 2 ) as well as a reduced swelling ratio (11.7% vs. 14.3%). As a result, the cell with the bi-comb-shaped membrane exhibits improved voltage efficiency, thus achieving increased energy efficiency. In addition, the membrane of this structure occupies excellent cycle stability. The cell efficiencies maintain almost stable for 250 cycles, and the chemical structure has no change after immersing in the electrolyte solution for 28 days.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Quan Chen,Jing Luo,Junbin Liao,Chengzhen Zhu,Junhua Li,Jingwen Xu,Yanqing Xu,Huimin Ruan,Jiangnan Shen
Proton blocking anion exchange membrane (AEMs) can be used to treat various of acidic wastewater (i.e., enrich the recovered acid from acidic wastewater). In this work, four AEMs based on aliphatic chain segment imbedding poly(arylene ether sulfone)s bearing salt-terminated side-chains have been prepared for acid enrichment by electrodialysis (ED). In particular, the length of flexible aliphatic chain segments (methylenes of –(CH 2 ) 3 –), –(CH 2 ) 6 –, –(CH 2 ) 9 –, and –(CH 2 ) 12 –) in aromatic poly(arylene ether sulfone) was tuned to tailor the micro-structure. Our investigation demonstrates that the AEM with aliphatic chain segments of –(CH 2 ) 12 – shows the strongest surface hydrophobicity (water contact angle: 107°) and has the smallest ion clusters (0.75 nm, relative to the other three AEMs with 0.78 nm, 0.80 nm, and 0.81 nm). In ED process, at the current densities of 10 mA cm −2 , the maximum concentration of H + enriched by the AEM is 2.06 M (initial concentration: 1.0 M). The investigations demonstrate that the optimized AEM with stronger hydrophobicity and smaller ion clusters shows the superior capacity of acid concentration relative to commercial AEM (AMX, Astom Japan). This work should be certain guiding significance for designing advanced proton blocking AEMs.
研究领域:
材料科学
·
化学工程
·
环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zekun Zhou,Zengren Tao,Linyun Zhang,Xueying Zheng,Xieyi Xiao,Zhen Liu,Xin Li,Guangfeng Liu,Pengfei Zhao,Peng Zhang
A scalable manufacturing protocol is developed to prepare polymer-based solvent-free all-solid flexible energy storage devices based on a two-roll mill and adapted rubber mixing technology. The as-prepared solid polymer electrolytes (SPEs) consisting of commercial poly(methyl methacrylate)-grafted natural rubber (MG30) and lithium bis(trifluoromethanesulfonyl)imide achieve a superior ionic conductivity of 2.7 × 10–3 S cm–1 at 30 °C. The superior ionic conductivity is attributed to the formation of an ionic cluster network in the composite as proved by small-angle X-ray scattering and infrared spectroscopy measurements. Moreover, the as-prepared SPEs show good mechanical stability over a broad temperature range, that is , a storage modulus above 1 × 104 Pa from 30 to 120 °C as indicated by the rheology data. Furthermore, the SPEs were assembled with the carbon black-filled MG30 (i.e., MG30C) electrode into a flexible supercapacitor cell, which had a wide voltage window of 3.5 V, good energy density of 28.4 μW h·cm–2 at 160 °C, and good temperature tolerance up to 160 °C. This scaling-up manufacture strategy shows tremendous potential to the advancing of SPEs in applications of flexible energy storage device.
研究领域:
材料科学
·
高分子化学
·
电化学
·
能源存储
·
柔性电子学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 63
·期 2
·574-583
·
IF 2.573
Tianming Gao,Biao Yu,Yonghai Hui,Jing Chen,Kyungho Chung,Sheng Wang,Yongyue Luo
Covalent bond cross-link networks endow rubber with unique resiliency enabling it to be widely used as a series of irreplaceable materials in modern life. However, the balance between rigidity and toughness, which is highly desired with the growing demand for high-performance rubber, remains a significant challenge for covalent bond networks. In this study, magnesium oxide (MgO) was filled in an ethylene acrylic elastomer (AEM) to construct both ionic cluster and coordinate bonds within the framework of a covalent cross-link network, which significantly improved the properties of AEM. The MgO-filled AEM was measured through Fourier transform infrared spectroscopy and thermogravimetric analysis, using a universal testing machine, dynamic mechanical thermal analyzer, and rubber process analyzer. As the multi-bond network was successfully constructed, the tensile strength was enhanced by almost 10 times, and unexpected dynamic properties were exhibited with a higher elastic modulus (rigidity) attributed to ionic clusters and a higher loss factor (toughness) attributed to the coordinate bonds. With the efficient enhancement of the mechanical properties, the improved toughness can dissipate energy to preserve the integrity of rubber under the application of an external mechanical force.
研究领域:
材料科学
·
高分子化学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2023
·
IF 5.3
Lichao Xia,Fei Song,Fangang Meng,Liang Wang,Shanshan Zhao
Nanofiltration (NF) shows great potential for water treatment and recycling. Nevertheless, severe membrane fouling significantly decreased lifetime and performance of NF membranes, impeding NF applications for clean water production. Herein, novel antifouling NF membranes with a pseudo zwitterionic separation layer were designed using layer-by-layer (LBL) assembly of amino-quinone networks (AQNs) and hydrophilic phytic acid (PhA) (AQN-PhA). The AQNs were formed by 5-hydroxy-1,4-naphthoquinone (HNQ) and polyethylenimine (PEI) via Michael addition and Schiff base reaction. The modification conditions of the AQN-PhA system were systematically investigated for an optimum membrane performance. The optimized conditions were found to be a PEI molecular weight of 600 Da, HNQ/PEI ratio at 1:2, an AQN coating time of 10 min, and pH of PhA at 5. The optimized membrane (i.e., AQN-PhA-5-2L) showed improved hydrophilicity along with a pure water permeability of 9.0 L·m–2·h–1·bar–1 and a molecular weight cut-off of 766 Da. It exhibited excellent fouling resistance with approximately 94% flux recovery ratio against a synthetic wastewater during a long-term filtration, which was superior in comparison with a benchmark commercial polyamide NF membrane. This study provides an idea for simple, feasible, and scalable zwitterionic modification in the future design of antifouling NF membranes.
研究领域:
环境工程
·
材料科学
·
水处理
✓ 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）