INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Zhaojie Yang,Minghua Zhang,Zhixin Zhao,Wenting Lan,Xi Zhang,Minmin Fan
To avoid the detrimental effect of aryl ethers on the alkali stability of anion exchange membrane (AEM), elaborately designed and synthesized poly(styrene- co -4-vinyl pyridine) (PS4VP) copolymer without aryl ether linkages is used to prepare AEMs. By introducing commercialized polyquaternium-10 (PQ-10) as the main ion-conducting molecule, the fully-interpenetrating polymer network quaternized PS4VP/PQ-10 (F-IPN QPS4VP/PQ-10) AEMs are prepared by cross-linking PS4VP and PQ-10, respectively. The as-prepared F-IPN QPS4VP/PQ-10 AEMs have obvious nanoscale microphase-separated morphologies, which ensure the membranes have good mechanical properties and dimensional stability. With optimized component ratios, F-IPN QPS4VP/PQ-10 AEM exhibits high ionic conductivity (74.29 mS/cm at 80 °C) and power density (111.83 mW/cm 2 at 60 °C), as well as excellent chemical stabilities (94.36% retaining of initial mass after immersion in Fenton reagent at 30 °C for 10 days, and 92.28% retaining of original ionic conductivity after immersion in 1 M NaOH solution at 60 °C for 30 days), which are greater than those of semi-interpenetrating polymer network QPS4VP/PQ-10 AEM. In summary, a combination of fully-interpenetrating polymer network and stable polymer chains and ion-conducting moieties is found to effectively overcome the trade-off between high ionic conductivity and good dimensional/chemical stabilities.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
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2020
·Vol. 11
·期 1
·1-10
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IF 12.121
Zhou Jing,Zhang Linjuan,Huang Yu-Cheng,Dong Chung-Li,Lin Hong-Ji,Chen Chien-Te,Tjeng L. H.,Hu Zhiwei
The ability to determine the electronic structure of catalysts during electrochemical reactions is highly important for identification of the active sites and the reaction mechanism. Here we successfully applied soft X-ray spectroscopy to follow in operando the valence and spin state of the Co ions in Li 2 Co 2 O 4 under oxygen evolution reaction (OER) conditions. We have observed that a substantial fraction of the Co ions undergo a voltage-dependent and time-dependent valence state transition from Co 3+ to Co 4+ accompanied by spontaneous delithiation, whereas the edge-shared Co–O network and spin state of the Co ions remain unchanged. Density functional theory calculations indicate that the highly oxidized Co 4+ site, rather than the Co 3+ site or the oxygen vacancy site, is mainly responsible for the high OER activity.
研究领域:
电化学
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催化
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材料科学
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光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2026
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IF 7.1
Axue Wang,Bingbing Lai,Xiaobo Wang,Huaigang Su,Wenjing Lou,Shengmao Zhang
Biobased lubricants have garnered significant attention due to their environmentally friendly characteristics. In this study, poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB) was employed as a thickener to successfully prepare four biobased greases with identical NLGI consistency grades. Scanning electron microscopy (SEM) characterization revealed that the P34HB thickener formed a three-dimensional lamellar network microstructure, elucidating the grease formation mechanism of the P34HB thickener. Rheological tests demonstrated that this grease system exhibited typical non-Newtonian fluid behavior and pronounced shear-thinning effects. Tribological performance evaluation indicated that the grease formulated with acetyl triethyl citrate (ATEC) as base oil displayed optimal friction-reducing and anti-wear properties. This research provided expanded base oil options for developing eco-friendly lubricants, extended the application scope of biobased materials in grease technology, and held substantial engineering value for promoting innovative development in green lubrication technologies
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2012
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IF 4.531
Zian Lin,Hui Huang,Xiaobo Sun,Yao Lin,Lan Zhang,Guonan Chen
A new polymer monolith with three modes of reverse-phase, hydrophilic and cation-exchange interaction was synthesized in 100 μm i.d. fused-silica capillary by in situ polymerization procedure. The pre-polymerization mixture consisted of glycidyl methacrylate (GMA) and 4-vinylphenylboronic acid (VPBA) as bifunctional monomers, ethylene dimethacrylate (EDMA) as crosslinker, 1,4-butanediol (BDO) and diethylene glycol (DEG) as binary porogenic solvents, and azobisisobutyronitrile (AIBN) as initiator. The resulting poly(GMA-co-VPBA-co-EDMA) monolith showed a relatively homogeneous monolithic structure, good permeability and mechanical stability. Different ratios of monomers and porogens were used for optimizing the properties of monolithic column. The column performance was assessed by the separation of a series of neutral solutes, charge solutes, phenols and anilines. Compared with poly(GMA-co-EDMA) monolith, the proposed monolith exhibited more flexible adjustment of selectivity in terms of hydrophobic, hydrophilic, as well as cation-exchange interaction in the same chromatographic conditions. High column efficiencies for benzene derivatives with 70,000–102,000 theoretical plates/m could be obtained at a linear velocity of 0.265 mm/s. The run-to-run, column-to-column, and batch-to-batch repeatabilities of the retention times were less than 8.23%. Additionally, the purposed monolith was also applied to efficient separation of alkaloids and proteins for demonstrating its potential in biomolecule separation.
研究领域:
分析化学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
TRENDS IN BIOTECHNOLOGY
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2024
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IF 14.3
Jian Li,Xu Zhang,Zi-Xin Peng,Jian-Hai Chen,Jian-Hui Liang,Li-Qing Ke,Dan Huang,Wen-Xiang Cheng,Sien Lin,Gang Li,Rui Hou,Wen-Zhao Zhong,Zheng-Jie Lin,Ling Qin,Guo-Qiang Chen,Peng Zhang
The understanding of cellular energy metabolism activation by engineered scaffolds remains limited, posing challenges for therapeutic applications in tissue regeneration. This study presents biosynthesized poly(3-hydroxybutyrate- co -4-hydroxybutyrate) [P(3HB- co -4HB)] and its major degradation product, 3-hydroxybutyrate (3HB), as endogenous bioenergetic fuels that augment cellular anabolism, thereby facilitating the progression of human bone marrow-derived mesenchymal stem cells (hBMSCs) towards osteoblastogenesis. Our research demonstrated that 3HB markedly boosts in vitro ATP production, elevating mitochondrial membrane potential and capillary-like tube formation. Additionally, it raises citrate levels in the tricarboxylic acid (TCA) cycle, facilitating the synthesis of citrate-containing apatite during hBMSCs osteogenesis. Furthermore, 3HB administration significantly increased bone mass in rats with osteoporosis induced by ovariectomy. The findings also showed that P(3HB- co -4HB) scaffold substantially enhances long-term vascularized bone regeneration in rat cranial defect models. These findings reveal a previously unknown role of 3HB in promoting osteogenesis of hBMSCs and highlight the metabolic activation of P(3HB- co -4HB) scaffold for bone regeneration.
研究领域:
组织工程
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再生医学
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细胞代谢
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生物材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Danyang Li,Xiaoxia Le,Shuxin Wei,Hui Shang,Fuqing Shan,Guorong Gao,Jintao Yang,Tao Chen
Hydrogel actuators showing shape morphing in response to external stimuli are of significant interest for their applications in soft robots, artificial muscles, etc. However, there is still a lack of hydrogel actuators with adjustable stimulus responsiveness for on-demand driving. In this study, an organohydrogel actuator was prepared by a two-step interpenetrating method, resulting in the coexistence of poly(N-isopropylacrylamide-co-4-(2-sulfoethyl)-1-(4-vinylbenzyl) pyridinium betaine) (p(NIPAM-SVBP)) hydrophilic networks and poly(lauryl methacrylate) (pLMA) hydrophobic networks with gradient distribution. In the initial state, the organohydrogel actuator can be driven globally under thermal stimulation. Owing to the unique alkali-chromic performance of SVBP, the organohydrogel actuator can be endowed with photothermal properties and actuate locally under the stimulus of NIR light. More importantly, the organohydrogel will return to the original colorless state after being treated with acid solution. Our work provides a new insight into designing and fabricating novel actuators with adjustable stimulus responsiveness for on-demand morphing.
研究领域:
材料科学
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软体机器人
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人工肌肉
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高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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