SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2014
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IF 5.03
Kai Chen,Ruowang Liu,Chao Zou,Qinyi Shao,Yunjun Lan,Xiaoqing Cai,Lanlan Zhai
Linear polyurethane (PU) ionomers were synthesized as solid–solid phase changing materials (PCMs) for thermal energy storage . Poly(ethylene glycol)s (PEGs) with 6000 and 10,000 g/mol number average molecular weight were used as latent heat storage materials, and 4,4-diphenylmethane diisocyanate (MDI), N-methyldiethanolamine (MDEA) and 1,3-Propanesulfonate (PS) were used as supporting materials. The phase change enthalpies of PU ionomers were 142.5 J/g and 152.3 J/g respectively, which were much close to the highest reported value of the branched PUPCM or the cross-linking PUPCM. The results of Fourier transform infrared spectroscopy (FT-IR) and atomic force microscopy (AFM) suggested a high degree of phase separation existed in PU ionomers . And the thermal resistance of PU ionomers was improved by the introduction of ionic groups.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Nanjun Chen,Chuanrui Lu,Yunxi Li,Chuan Long,Ziming Li,Hong Zhu
A practical polyelectrolyte system to improve the ion conductivity and lifetime of anion exchange membranes (AEMs) is a critical requirement for alkaline membrane fuel cells (AMFCs). Crosslinking is an effective approach to optimize the performance of AEMs. However, ordinary crosslinkers with a hydrophobic structure always make AEMs mechanically brittle. Herein, in response to the requirement of high-performance AEMs, a series of tunable multi-cation-crosslinked poly(biphenyl piperidinium) (PBP-xQ4) membranes were designed and prepared by embedding flexible cationic crosslinkers. The number of alkyl spacers between the cationic groups in the flexible crosslinkers were optimized to 5 and 6 to achieve optimum performance. These PBP-xQ4 membranes simultaneously have high ion conductivity (155 mS/cm at 80 °C) and good dimensional stability, and these membranes can be folded into many shapes. Besides, the crosslinking also promotes the alkaline stability of these membranes in 2 M NaOH at 80 °C: only a slight degradation is detected by 1 HNMR after alkaline treatment for1800 h. All these impressive results in ion conductivity and durability are attributed to clear nanophase separation in PBP-xQ4 membranes. Moreover, the PBP-xQ4 membrane realizes a maximum power density of 234 mW/cm 2 at 80 °C.
研究领域:
材料科学
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燃料电池技术
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产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
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2019
·Vol. 220
·期 8
·1800571
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IF 2.622
Jia Wu,Wenbin Niu,Shufen Zhang,Suli Wu,Wei Ma,Bingtao Tang
Supramolecular elastomers have attracted extensive attention due to their excellent mechanical properties. Herein, inspired by the concept of a dual cross-linked network structure, a dual-component coordination supramolecular elastomer is prepared via photopolymerization of three monomers combined with zinc ion (Zn 2+ )-crosslinked low molecular weight polyacrylic acid (PAA). The covalent network of three monomers serves as a soft component forming the supporting network. The network of Zn 2+ crosslinked low molecular weight PAA forms the hard component. The covalent network is crosslinked and locked by the coordinated network. This compact network contributes to improving the comprehensive mechanical properties. The optimal elastomer is that the molar ratio of carboxylic of low molecular weight PAA with Zn 2+ is 1:0.5. The tensile and compression stress of the optimal elastomer are 4.08 and 6.90 MPa, respectively. The loading–unloading cycles can reach 1000 times without fracture. The self-recovery ratios of the tensile and compression modes reaches 80% and 95%, respectively.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
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IF 4.865
Yonghuan Zhao,Jinqing Hu,Xiaoxiao Hu,Feichao Zhu,Juanjuan Su,Jian Han
Metal ions coordination modification is an efficient method for preparing antibacterial textile, but there are still problems such as unstable coordination and poor antibacterial durability. Herein, a copper ion-crosslinked sodium alginate-graphene oxide (Cu 2+ /SA-GO) structure was designed and constructed on the nylon 66 fabric with polydopamine (PDA)-mediated layer-by-layer self-assembled technology. The cross-linked network structure of Cu 2+ and SA-GO not only improved the loading fastness of Cu 2+ but also promoted the saltwater resistance of the SA-based coatings. Concurrently, the PDA mediated the layer self-assembly process and facilitated the durability of the coating simultaneously. The results showed that the antibacterial ratio of the prepared fabric against Staphylococcus aureus and Escherichia coli were still up to 99.9 % after 30 times washing. In addition, the modified fabric exhibited good antistatic property with a surface resistivity of about 10 8 Ω.cm, which was attributed to the strong hydrophilic property of the self-assembled coating. This work may provide a new method for the efficient preparation of long-lasting antibacterial fabrics.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 10
·800
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IF 3.504
Peng Lu,Ren Liu,Xin Liu,Min Wu
Cellulose hydrogels are often prepared from native cellulose through a direct cellulose dissolution approach that often involves tedious process and solvent recovery problems. A self-supporting cellulose hydrogel was prepared by gelation of the TEMPO-oxidized bagasse cellulose nanofibrils (CNF) triggered by strong crosslinking between carboxylate groups and Zn2+. TEMPO process was used to generate negatively charged carboxylate groups on CNF surface to provide a high binding capability to Zn2+. Three TEMPO-oxidized CNFs of different carboxylate contents were prepared and characterized. TEM and AFM microscopes suggested that the sizes of CNFs were fined down and carboxylated cellulose nanofibrils (TOCNFs) of 5–10 nm wide, 200–500 nm long, and carboxylate contents 0.73–1.29 mmol/g were obtained. The final structures and compressive strength of hydrogels were primarily influenced by interfibril Zn2+-carboxylate interactions, following the order of TOCNFs concentration > content of carboxylate groups > concentration of zinc ions. A CO2sensitive self-supporting cellulose hydrogel was developed as a colorimetric indicator of food spoilage for intelligent food packaging applications.Keywords:hydrogel;cellulose nanofibrils;zinc ions;ionic cross-linking;bagasse cellulose fiber
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
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2023
·
IF 9.4
Weina Deng,Weiming Liu,Hai Zhu,Liang Chen,Haiyang Liao,Han Chen
With the expansion of portable devices, high-security and flexible energy storage technologies are gaining popularity. However, because of the use of poisonous, flammable, and unstable organic liquid electrolytes in commercial lithium-ion batteries, they cannot provide sufficient protection for the safety and long-term life of portable devices. A thiolate click reaction and ion interaction are used to successfully create a double cross-linking ionogel electrolyte (DC-Ionogel) by sealing 1-ethyl-3methyimidazolium bis (trifluoromethyl) imide (EMIm (TFSI) ) in a double cross-linked network. An ion cross-linking network and a covalent cross-linking network are interlaced in the double cross-linked network, which considerably increased the flexibility and stability of the ionogel electrolyte. As a result, DC-Ionogel outperformed in terms of flame retardancy and thermal dimensional stability and outperformed in terms of electrochemical performance, with higher room ionic conductivity (1.79 × 10 −3 S cm −1 ) and a broader electrochemical window (5 V). Due to its excellent performance, it is more likely to be used in flexible energy-storage devices.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Shihao Peng,Yuhao Zhao,Chunyong Liang,Hongshui Wang,Huan Zhou,Lei Yang
Conductive hydrogels have attracted a lot of research interest in artificial intelligence, health monitoring, soft robotics, and more. However, it is still a great challenge to combine the hydrogel platform with electrical conductivity, high tensile strength, self-adhesiveness, low-temperature resistance, and water resistance in a green and low-cost way. As a rich biodegradable plant protein that can be mixed with water and kneaded into highly viscous and stretchable hydrogels, gluten shows great potential in the field of flexible sensing. However, gluten-based hydrogels can be easily deformed under stress, showing low resilience and poor structure stability. Therefore, to solve these problems, poly(vinyl alcohol) (PVA), glycerol, and different ions were introduced into the gluten hydrogel to improve its mechanical and conductive performances. The as-prepared gluten-PVA-glycerol-LiCl (GPGLi) organohydrogel revealed high stretchability (>743%), high toughness (1.48 MJ/m3), water resistance, frost resistance, and long-term stability, in which abundant hydrogen bonds were formed between PVA and gluten as well as glycerol and water. These characteristics paved the way for the development of a flexible strain sensor with high sensitivity over different stretching ranges for body motion monitoring. In addition, the GPGLi organohydrogel was found to be water-resistant, making it applicable for underwater activity monitoring as well. Finally, the GPGLi organohydrogel was adopted as a wireless sensing component for monitoring real-time pulse, implying the great potential of gluten in flexible sensing.
研究领域:
材料科学
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生物医学工程
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智能传感
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产品关联
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 10
·2231-2239
·
IF 7.804
Ying Pan,Xiaofei Zhai,Jian Yin,Tianqi Zhang,Liujia Ma,Yi Zhou,Yufeng Zhang,Jianqiang Meng
Graphical A metal-ion-crosslinked PIM-1 framework as heterogeneous catalyst is reported for promoting the CO 2 cycloaddition with epoxides. The new catalyst PIM-COONa-Zn demonstrates both high catalytic efficiency and good recyclability. CO 2 cycloaddition to epoxides is an effective and economical utilization method to alleviate the current excessive CO 2 emission situation. The development of catalysts with both high catalytic efficiency and high recyclability is necessary but challenging. In this context, a heterogeneous catalyst was synthesized based on a zinc-ion-crosslinked polymer with intrinsic microporosity (PIM-1). The high microporosity of PIM-1 promoted a high Zn 2+ loading rate. Additionally, the relatively stable ionic bond formed between Zn 2+ and the PIM-1 framework through electrostatic interaction ensured high loading stability. In the process of CO 2 cycloaddition with propylene epoxide, an optimized conversion of 90 % with a turnover frequency as high as 9533 h −1 could be achieved within 0.5 h at 100 °C and 2 MPa. After 15 cycles, the catalytic efficiency did not demonstrate a significant decline, and the catalyst was able to recover most of its activity after Zn 2+ reloading. This work thereby provides a strategically designed CO 2 conversion catalyst based on an ionic crosslinked polymer with intrinsic microporosity.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yueshan Li,Da Li,Weihao Yuan,Yibo Shen,Zhen Hu
Conventional epoxy resins have high cross-linking density and rigid molecular structures, which make them difficult to develop into flexible elastomers. Here, inspired by the cuticle of the marine mussel byssi, we incorporate reversible Fe3+–carboxyl cross-links into a cross-linked epoxy network through a transformation between chemical cross-links and physical cross-links to realize the construction of a dynamic cross-linked network in traditional epoxy resins. Dynamic cross-linking networks and long flexible chain segments endow the epoxy system with excellent stretchable properties. Carbon nanotubes coated with ferric oxide (Fe3O4) nanoparticles were synthesized and added to the epoxy system, reinforcing the epoxy system. The synergistic combination of the modified molecular structure and nanohybrid endows the epoxy system with 550% elongation at break, a tensile strength of 1.4 MPa, and the ability to respond quickly to an applied magnetic field. An ultrasensitive strain sensor was constructed from synthetic epoxy hybrid materials; the GF (strain coefficient) of the strain sensor was up to 344.32. This research will be beneficial in expanding the application range of traditional epoxy polymer materials in the emerging sensor field.
研究领域:
材料科学
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化学工程
·
传感器技术
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Fanghui Wang,Defang Kong,Hong Zhu
A series of (dipole-) multicationic cross-linked SEBS-based AEMs were prepared using a multicationic cross-linking strategy with SEBS as the polymer skeleton, which has good alkali stability. By controlling the cross-linking degree, the performance of AEM can be regulated. Introducing a multicationic cross-linking agent DACEE-containing hydrophilic alkoxy chains (dipoles) to improve the performance of the AEMs. The difference in hydrophilicity/hydrophobicity of alkoxy chains in DACEE and the dipole interaction between oxygen atoms and cations contribute to the construction of microphase separation, broadening of ion transport channels, and promoting ion transport efficiency. The steric hindrance of cage-shaped cations in cross-linked structures and the hydrophilicity of alkoxy groups in cross-linking agent DACEE can enhance the alkaline stability of AEMs. The additional intermolecular forces generated after cross-linking enhance the mechanical properties of the cross-linked membrane. Among them, the SEBS-C6TMA-DACEE20% membrane with the best mechanical properties (Ts: 15.37 MPa, Eb: 250.83%) had an OH– conductivity of 93.61 mS·cm–1 at 80 °C, and after soaking in 2 M NaOH solution for 1500 h, the OH– conductivity decreased by 16.3%.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Extreme Mechanics Letters
·
2025
·
IF 4.5
Jingping Wu,Zhengjin Wang,Xiao Liu,Yong Zheng,Yang Gao,Jian Hu
Hydrogels with high water content and toughness are essential to various applications in smart materials and biomimetic systems. However, there exists a conflict between water content and toughness. To enhance toughness, high polymer chain density or water-free reinforcements are usually introduced into hydrogel matrices, which inevitably lead to a reduction in water content. In this study, we present a facile method for preparing water-abundant and tough hydrogels through ion transfer printing. By utilizing sodium alginate/polyacrylamide (Alg/PAAm) hydrogels as a flexible matrix and Fe 3+ ions as stiffening agents, we selectively introduce Fe 3+ ions into predefined regions of the hydrogel matrix, resulting in well-structured composite hydrogels comprising soft Alg/PAAm matrix and hard Fe 3+ -crosslinked Alg/PAAm (Fe-Alg/PAAm) fibers. As both the matrix and fibers are stretchable and water-abundant, the composites exhibit impressive stretchability ( ε ∼1000 %) and water content ( p ∼95 %). Notably, the alternating arrangement of the soft and hard fiber/matrix architecture effectively prevents crack propagation during loading by inducing stress deconcentration at the crack tip, thereby leading to exceptional toughness ( Γ ∼22000 J/m 2 ). This simple method introduces a universal design strategy for constructing stretchable, water-abundant, and tough hydrogels, considering that ionic crosslinking with multi-valent cation crosslinkers is widely used in hydrogels. Beyond the Fe 3+ and Alg/PAAm hydrogel system discussed here, this concept can be extended to various combinations of multi-valent ions and hydrogel networks containing opposite charges.
研究领域:
材料科学
·
生物材料
·
智能材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2018
·
IF 3.997
Renshu Zhang,Lei Lei,Qianqian Song,Xingyi Li
Combining a low-molecular-weight hydrogel (LMWH) with a polymeric hydrogel overcomes the disadvantages of the LMWH ( e.g. , its low mechanical property) and is associated with the enhancement of materials performance, which is useful in a variety of biomedical applications. In the present work, a hybrid hydrogel that combines dexamethasone sodium phosphate (Dexp) and a polysaccharide (alginate) was explored via a calcium ion coordination strategy. With the addition of Ca 2+ to an aqueous solution of Dexp/alginate, the Ca 2+ /Dexp/alginate hybrid hydrogel formed spontaneously. The formed Ca 2+ /Dexp/alginate hybrid hydrogels were thoroughly characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (XRD). An in vitro drug release study indicated that the formed Ca 2+ /Dexp/alginate hybrid hydrogel provided a slower drug release rate than did the Ca 2+ /Dexp hydrogel, and the drug release behaviour could be finely tailored by the change of Ca 2+ concentration. More importantly, the subcutaneous injection of the Ca 2+ /Dexp/alginate hybrid hydrogel significantly extended the in vivo retention of the hydrogel in situ compared to that of the Ca 2+ /Dexp hydrogel. The in vivo pharmacokinetic analysis indicated that the Ca 2+ /Dexp/alginate hybrid hydrogel could greatly extend drug release in vivo and significantly improve drug bioavailability compared to the Ca 2+ /Dexp hydrogel. As such, the formed Ca 2+ /Dexp/alginate hybrid hydrogel combined the greater resilience of an alginate network with the long in vivo duration of a low-molecular-weight hydrogel (Ca 2+ /Dexp hydrogel) and remarkably enhanced drug bioavailability, which might open an avenue for the design of self-assembling steroidal drug-polysaccharide hybrid hydrogels for drug delivery applications.
研究领域:
生物材料学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）