DESALINATION
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2014
·
IF 3.96
Ling-Ling Shao,Quan-Fu An,Yan-Li Ji,Qiang Zhao,Xue-San Wang,Bao-Ku Zhu,Cong-Jie Gao
Sulfated carboxymethyl cellulose (SCMC) with tailored amount of sulfate groups was synthesized, and their composite nanofiltration membranes (SNFMs) were prepared by solution casting onto polysulfone (PSF) supporting membrane and crosslinking by glutaradehyde (GA). Chemical structure and composition of SCMCs and SNFMs were characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. SNFM surfaces were examined by field emission scanning electron microscopy , water contact angle and streaming potential measurement. The effects of the chemical composition on the hydrophilicity , the surface charge and the nanofiltration performance of SNFMs were determined. It is found that the incorporation of sulfate groups improves the water permeability of SNFMs while retaining their salt rejection. For the feed mixture of aqueous Na 2 SO 4 (1.0 g L − 1 , pH = 6.5), the optimum water flux is 39.6 L m − 2 h − 1 , which is 2.2 times of the pristine SNFM-0. For the xylenol orange (XO) dye solution (0.1 g L − 1 , pH = 4.0), the flux of SNFM-3 (30.0 L m − 2 h − 1 ) is also higher than that of SNFM-0 (11.1 L m − 2 h − 1 ). In addition, SNFM-3 exhibits good separation performance and chemical stability in treating saline anionic dye aqueous solution (MYB/NaCl) in acidic conditions.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Jiashuai Yao,Xueying Liu,Haibin Sun,Suting Liu,Yingjie Jiang,Bing Yu,Nanying Ning,Ming Tian,Liqun Zhang
In this study, ester group grafted polymethylvinylsiloxane (PMVS-COCH3) with low elastic modulus (Y) and strong polarizability was synthesized and introduced into thermoplastic polyurethane (TPU) with good mechanical properties, high dielectric constant (εr), and easy recyclability to prepare high performance dielectric elastomer (DE). PMVS-COCH3 with high grafting degree and low molecular weight was synthesized via the thiol–ene addition reaction and then was solution blended with TPU at low PMVS-COCH3/TPU blending ratios. The as-prepared blends still exhibit good mechanical properties and relatively high electrical breakdown strength because the low content of insulated PMVS-COCH3 phase is dispersed in continuous TPU phase. Both simulation and experimental results indicate that the ester groups on PMVS-COCH3 can form hydrogen bonds with TPU, leading to the disruption of C═O/N–H hydrogen bonding between TPU chains and thus enhancing dipole polarizability. Meanwhile, the PMVS-COCH3 dispersed phase acts as a soft polar filler in the TPU matrix, resulting in interfacial polarization and lower Y. Both the introduction of interfacial polarizability and the improvement of dipole polarizability largely increase the εr of the blend. The actuated strain under the same electric field of the blends over that of pristine TPU is largely improved. At the blending ratio of 3/7, the actuated strain reaches 6.9% without any prestrains, which is the highest actuated strain among various previously reported TPU-based DEs.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
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2022
·
IF 7.613
W. Chen,P. Liu
Ultrasound has been recognized as an exciting tool to enhance the therapeutic efficacy in tumor chemotherapy owing to the triggered drug release, facilitated intracellular drug delivery, and improved spatial precision. Aiming for a precise localized drug delivery, novel dendritic polyurethane-based prodrug (DOX-DPU-PEG) was fabricated with a drug content of 18.9% here by conjugating DOX onto the end groups of the functionalized dendritic polyurethane via acid-labile imine bonds. It could easily form unimolecular micelles around 38 nm. Compared with the non-covalently drug-loaded unimolecular micelles (DOX@Ph-DPU-PEG), they showed excellent pH/ultrasound dual-triggered drug release performance, with drug leakage of only 4% at pH 7.4, but cumulative release of 14% and 88% at pH 5.0 without and with ultrasound, respectively. The ultrasound responsiveness was attributed to the unique strawberry-shaped topological structure of the DOX-DPU-PEG, in which DOX was embedded in the skin layer of the hydrophobic DPU cores. With ultrasound, the DOX-DPU-PEG unimolecular micelles possessed enhanced tumor growth inhibition than free DOX but showed no obvious cytotoxicity on the tumor cells without ultrasound. Such feature makes them promising potential for precise localized drug delivery.
研究领域:
药学
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生物医学工程
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肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Bo Pang,Qi Zhang,Xiaoming Yan,Xiaozhou Wang,Wanting Chen,Ruohan Du,Xuemei Wu,Minggang Guo,Gaohong He,Fujun Cui
Proton conductive group is essential to provide ion transport site and tune micro-phase separation in proton exchange membranes for vanadium redox flow battery (VRFB), while nearly all the fabrication methods are based on the benchmark sulfonic acid group. Herein, the sulfate ester group (-OSO 3 H) with superior acidity is proposed as a novel proton conductive group to achieve high proton transport at lower IECs, therefore disentangles the trade-off between vanadium crossover and conductive ion diffusion. The electron withdrawing ester oxygen atom endows sulfate ester group with 27 kJ mol −1 lower proton binding energy than the sulfonic acid group, leading to higher proton dissociation ability and better micro-phase separation. The 1,3-propanediol cyclosulfate grafted polybenzimidazole with IEC of 1.85 (OPBI-OSO 3 H-1.85) reaches comparable area resistance (0.19 Ω cm −2 ) to the sulfonic acid grafted polybenzimidazole with much higher IEC of 2.95 (OPBI-SO 3 H-2.95), but 19.1% decrease in vanadium permeability. The cell assembled with OPBI-OSO 3 H-1.85 achieves high energy efficiency of about 86.7% and low decay of discharge capacity (0.41% per cycle), superior to that of OPBI-SO 3 H-2.95 (0.51% per cycle) and Nafion 212 (0.71% per cycle). The sulfate ester group is proved to be chemically stable in H 2 SO 4 /vanadium environment.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Wen-Feng Ren,Jia-Bo Le,Jun-Tao Li,Yi-Yang Hu,Si-Yu Pan,Li Deng,Yao Zhou,Ling Huang,Shi-Gang Sun
Binders play a crucial role in the development of silicon (Si) anodes for lithium-ion batteries with high specific energy. The large volume change of Si (∼300%) during repeated discharge and charge processes causes the destruction and separation of electrode materials from the copper (Cu) current collector and ultimately results in poor cycling performance. In the present study, we design and prepare hydrogen-bonding cross-linked thiourea-based polymeric binders (denoted CMC-co-SN) in consideration of their excellent binding interaction with the Cu current collector and low cost as well. The CMC-co-SN binders are formed through in situ thermopolymerization of chain-type carboxymethylcellulose sodium (CMC) with thiourea (SN) in the drying process of Si electrode disks. A tight and physical interlocked layer between the CMC-co-SN binder and Cu current collector is derived from a dendritic nonstoichiometric copper sulfide (CuxS) layer on the interface and enhances the binding of electrode materials with the Cu current collector. When applying the CMC-co-SN binders to micro- (∼3 μm) (μSi) and nano- (∼50 nm) (nSi) Si particles, the Si anodes exhibit high initial Coulomb efficiency (91.5% for μSi and 83.2% for nSi) and excellent cyclability (1121 mA h g–1 for μSi after 140 cycles and 1083 mA h g–1 for nSi after 300 cycles). The results demonstrate that the CMC-co-SN binders together with a physical interlocked layer have significantly improved the electrochemical performance of Si anodes through strong binding forces with the current collector to maintain electrode integrity and avoid electric contact loss.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2025
·Vol. 68
·期 6
·1-16
·
IF 4.9
Yang Xuxuan,Zhang Qian,Nie Xiongfeng,Xu Ziyang,Liu Wenguang
The development of a meniscal substitute that conforms to the stringent requirements of high modulus, antiswelling, and shape compatibility continues to pose a significant challenge. Herein, the polycarbonate-based polyurethane (PCU) with a covalent adaptive network is constructed by introducing the Diels-Alder (DA) bonds into the hard segments of PCU as the dynamic covalent cross-linkage. On the one hand, the stability of DA bonds at low temperatures enables them to lock molecular chains within the hard domain in an aqueous environment, thus maintaining the high robustness of the resultant elastomer under physiological conditions. On the other hand, the incorporated DA bonds can be disrupted at high temperatures, facilitating the movement of the molecular chains through heating, thus allowing for the three-dimensional (3D) printing of the meniscus scaffold whose shape closely resembles that of the native tissue. The fabricated meniscus substitute is surgically implanted into the knee joints of rabbits for 12 weeks, with in-vivo outcomes illustratively showcasing its remarkable proficiency in mitigating cartilage surface degradation.
研究领域:
生物材料学
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组织工程
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再生医学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Zhang Jingchun,Wang Qiqi,Chen Haoyuan,Zhang Yilin,Deng Yupei,Wang Ying,Zhao Huimin,Zhu Yu,Wang Guowei,Zhuang Linghua
It is found that ester introduction into imidazolium or pyridinium cations can significantly improve the biodegradability property of ionic liquids and also influence the viscosity and the toxicity of ionic liquids. Ionic liquids based on dicyanamide anion reveal good electrochemical properties. Four chloride and dicyanamide ionic liquids with ester groups were prepared, and the effect of anion and cation structure of ionic liquids on electrical conductivity/electrochemical stability window was discussed from experimental studies and density functional theory (DFT) simulations. The introduction of the ester group in imidazolium cation decreased the refractive index and electrical conductivity, while increasing the electrochemical stability window of ionic liquids. The refractive index, electrical conductivity, and electrochemical stability window values decreased with the increase of the alkyl chain length of the ester group from ethyl to butyl. The refractive index values of chloride imidazolium ionic liquids were higher than those of dicyanamide ionic liquids, while the electrical conductivity and electrochemical stability window values of dicyanamide ionic liquids were much higher than those of chloride ionic liquids. DFT simulations revealed that ester introduction in imidazolium cation decreased the average hydrogen bond length and increased the cation–anion interaction. The average hydrogen bond length of chloride and dicyanamide ionic liquids increased with the increase of the alkyl chain length of the ester group from ethyl to butyl, while the absolute interaction energy (Δ E ) of chlorine and dicyanamide ionic liquids decreased with the increase of the alkyl chain length of the ester group from ethyl to butyl. DFT simulations demonstrated that ionic liquid structure (ester chain length and anion) was closely related to the electrical conductivity and electrochemical stability window properties of ionic liquids. These results will shed light on the design and optimization of functional ionic liquids as electrolytes for renewable energy and energy storage applications.
研究领域:
材料科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 9
·5415-5426
·
IF 3.809
Gu Jingwei,Yuan Lingjun,Zhang Ze,Yang Xinhui,Luo Junxuan,Gui Zifan,Chen Shiguo
Abstract We developed an isocyanate group containing quaternary ammonium salt (IQAS) as a potential antimicrobial finishing agent that can be stored in a high purity form for more than a year in dry environments to permit convenient transportation and storage. Additionally, we report a facile and eco-friendly finishing technique to fabricate durable antimicrobial cotton fabrics using IQAS as an antimicrobial finishing agent by a dipping–padding–drying process. IQAS was bound onto the surface of cotton fabrics by a covalent bond to obtain a cotton fabric with excellent bactericidal activity, tearing strength, breaking elongation, bending rigidity, water vapor permeability, surface roughness and smoothness. The antimicrobial rates of these fabrics reached 92.2% and 98.5% against gram-negative bacterium Escherichia coli and gram-positive bacterium Staphylococcus aureus , respectively, even after 50 laundering cycles. These values are much higher than the reference antimicrobial rates of AAA class antimicrobial fabrics, as well as those of conventionally finished cotton fabrics, indicating that the IQAS finished cotton fabrics maintained excellent antimicrobial activity even after long-term repeated launderings. Moreover, the results indicate that the IQAS-treated cotton fabrics could improve the breaking strength (increased by 13.5% in the warp direction and 20.3% in the weft direction), the bursting strength (increased by 11.9%), the air permeability (increased by 12.6%) and the hydrophilicity compared to untreated cotton fabrics. Additionally, our non-leaching antimicrobial cotton fabrics treated with IQAS were non-toxic and showed no skin stimulation. Therefore, IQAS and the antimicrobial finishing technique reported here have great potential applications in antimicrobial fabrics used in hospitals, hotels and other susceptible situations. Graphical abstract An isocyanate group containing quaternary ammonium salt that permits convenient transportation and storage was developed as a potential antimicrobial finishing agent to fabricate excellent antimicrobial cotton fabrics with well-preserved physical properties and security using a dipping–padding–drying process.
研究领域:
纺织科学
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材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Hongwei Li,Zhigang Tang,Zhimin He,Xia Gui,Longpeng Cui,Xian-zhong Mao
In order to show the structure-activity relationship for CO 2 absorbent, and identify or screen novel and efficient physical solvents of CO 2 , the constant-volume method, the Peng-Robinson equation of state , and a molecular simulation were used to investigate the impacts of type of functional groups, carbon chain length and number of functional groups for nine physical solvents. The three methods produced highly consistent results. Comparison of the CO 2 solubility in solvents with the same carbon numbers but different functional groups suggested that the ester group could promote CO 2 absorption. Investigation of the CO 2 solubility in solvents with one ester group but different carbon chain lengths revealed that longer carbon chains could enhance CO 2 absorption. Analyses of the CO 2 solubility of solvents with one and two ester groups demonstrated that more ester groups could further increase the CO 2 absorption. Therefore, the presence and number of ester groups and increased carbon chain length could promote CO 2 absorption. It provides direction and method for screening of highly efficient CO 2 absorbents and for the design and synthesis of new solvents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Krishnan Subramanyan,Sanming Chen,Na Li,Tingting Ma,Yongping Liu,Sundaram Chandrasekaran,Vanchiappan Aravindan
We report an MXene V 4 C 3 T x new low-voltage insertion anode and a comparison of the electrochemical performance with ester and ether-based electrolytes in half– and full–cell configuration with Na 3 V 2 (PO 4 ) 3 @C (NVPC). Though MXene has been explored for Na-ion batteries (SIB), M n +1 X n T x with n = 3 has been hardly explored. Moreover, the ether-based electrolyte has not been used with any MXenes for electrochemical energy storage , especially in the SIB perspective. The initial irreversibility in the carbonate-based half–cell (V 4 C 3 T x –C) is 128 mAh g −1 more than the tetraglyme–based half–cell (V 4 C 3 T x –T). After 100 cycles, V 4 C 3 T x –T maintains 84 mAh g −1 , while V 4 C 3 T x –C shows only 60 mAh g −1 , which shows the better retention ability in the ether-based system. As for the rate performance, though V 4 C 3 T x –T has a higher capacity in low currents, at higher currents, V 4 C 3 T x –C shows higher values. This showed that the carbonate-based system has diffusion and capacitive-based Na–ion storage, which enabled it to have a high–rate performance. An extensive in–situ impedance study revealed significant formation of the passivation layer in V 4 C 3 T x –C by irreversibly consuming Na–ions, which causes an increased initial Coulombic inefficiency, whereas no such significant SEI layer formation is evident for V 4 C 3 T x –T. Full–cells were assembled with NVPC cathode in tetraglyme and carbonate-based electrolytes. The full–cell with ether electrolyte exhibited enhanced capacity, capacity retention, and rate performance compared to ester-based electrolytes. The full-cell displayed an energy density of ∼66 and ∼74 Wh kg −1 for tetraglyme and ester-based electrolytes, respectively.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Shengdi Yan,Wenqin Lai,Ming Zhang,Guozhang Wu
Catalytic activities of metal laurates with different coordination capabilities and sodium salts with different ligand alkalinities toward the transesterification between isosorbide (ISB)-based polycarbonate (I c C-PC) and bisphenol-A polycarbonate (BPA-PC) are investigated to accelerate asymmetric chain exchange without aggravating chain degradation. Only catalysts capable of direct reaction with PC chains to form metal alkoxide containing active species (PC–O-M) can initiate and thus accelerate chain transesterification . Sodium salts exhibit the highest catalytic activity and can be further improved by complex formation of 15-crown-5, demonstrating the key role played by alkalinity of reactive ligands. Different from weak catalytic selectivity and serious chain scissions by tin-based catalysts, it is found that, for sodium-catalyzed systems, BPA-PC chains prefer to bond to ISB segments in endo position and the high reactivity of sodium-based catalysts not only significantly reduces essential loading but also suppresses chain degradation. We confirm that these differences must arise from whether active PC-O-M acts as a direct nucleophilic attacker or works with coordination process.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2019
·
IF 3.517
Mingjin Fan,Jia Ai,Chenghong Hu,Xin Du,Feng Zhou,Weimin Liu
In this paper, we present the synthesis and tribological properties of two naphthatate-based lubricating oils. The structure and purity of the oils were analyzed using nuclear magnetic resonance spectra and high resolution mass spectra. Their thermal and oxidation stability, flash point and pour point, viscosity and viscosity index, and friction reduction and anti-wear properties were also tested. In the results, the two isooctyl naphthatate-based oils (INA) displayed better lubricating properties than a reference sample of isooctyl sebacate (ISE) on three different friction pairs . The new oils also offered higher oxidation stability than the reference sample. It was found that the stability and lubrication properties of ester-based lubricating oils can be significantly improved by introducing a naphthalene ring into the molecular structure. This is because there is a large π-electron conjugate system on the naphthalene ring, which not only reduces the likelihood of an oxidation chain reaction, but also enables the oil to form an orderly and stable lubricating film on metal surfaces. One of the oils, 2,3-INA, was found have better oxidation stability than the other one, 1,4-INA, because its oxidized groups are positively affected by the steric and conjugation effects of the two ester groups.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）