JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Jie Wei,Jin Liu,Ximan Sun,Jialin Miao,Dawei Fang
In this paper, three functionalized ionic liquids (ILs), N-(2-methoxyethyl)-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C 1 OC 2 pyrr][NTf 2 ]), N-(2-methoxyethyl)-N-methylpyrrolidinium dicyanamide ([C 1 OC 2 pyrr][DCA]) and 1-allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([AMIM][NTf 2 ]) were designed, synthesized and structurally characterized by 1 H NMR and 13 C NMR, and their thermal stability was determined. The viscosity and conductivity of the pure ILs and their binary mixtures with acetonitrile were measured at standard pressure, 288.15–318.15 K. The temperature dependencies of viscosity and conductivity were described by Arrhenius equation, and the composition of the system with maximum conductivity was obtained according to Castel-Amis four-parameter equation. In addition, the interactions and structures are illustrated by the viscosity deviations (Δ η ), and the excess Gibbs energy of activation for viscous flow of the relative viscosity (Δ G ≠E ), mainly include the influences of the hydrogen bonding between cations and acetonitrile, close packing and the size of anion. The ionicity of systems were investigated qualitatively based on the Walden rule, and it can be judged that three ILs are not completely ionized and may form network structures, which dissociate into CIPs with further dilution. Moreover, it is found that ionicity is related to the kinds of ions, stability of network and viscosity.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 2
·1597-1604
·
IF 1.798
Yang Z. L.,Pan H. L.,Jiang X. S.,Wu H. T.
Low loss microwave dielectric ceramics Zn 0.92 Co 0.08 ZrNb 2 O 8 with wolframite structure were prepared by the solid state method. Sintering characteristics, phase composition and microwave dielectric properties were investigated systematically. X-ray diffraction results showed that all samples exhibited a wolframite structure. Rietveld refinement was used to analyze the crystal structure. Based on the lattice parameters, the bond ionicity, the lattice energy, the bond energy and the coefficient of thermal expansion were calculated to evaluate the structural characteristics. The ε
r
values could be strongly dependent on the bond ionicity of the Nb–O bonds. The Q·j values were main affected by the lattice energy and the bond energy of the Nb–O bonds. As for the τ
f
values, it could be mainly affected by the coefficient of thermal expansion of Zn/Co–O bonds. At the sintering temperature of 1200 °C, Zn 0.92 Co 0.08 ZrNb 2 O 8 ceramics exhibited the excellent microwave properties of ε
r
= 27.10, Q·f = 61,036 GHz (at 8.54 GHz) and τ
f
= −9.81 ppm/°C. These results demonstrated that Zn 0.92 Co 0.08 ZrNb 2 O 8 ceramics could be promising candidate materials for the application of highly selective microwave ceramic resonators and filters.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Gang Song,Wei-dong He,Hui-juan Li,Rong-feng Hu,Sheng-qi Chen
Self-assembly of long-subchain hyperbranched block copolymer (hyperblock) could achieve a novel micelle with multiple hydrophobic cores (multi-core micelle), while the hydrophobic components are generally consecutive in the core or shell of an independent conventional assembly. However, only a few studies focus on the synthetic methods and structure–property relationship of hyperblock. In this work, a degradable and cationic hyperblock with well-defined block subchain was prepared via seesaw-type macromonomer strategy. To improve the control of block subchain structure, degradable and pre-cationic block macromonomer with one alkynyl group in the chain middle and two azide groups at both chain ends, i.e. alkynyl -(PLA- b -PBocAEA-N 3 ) 2 , was deliberately designed and synthesized via the combination of ring-opening polymerization, atom transfer radical polymerization and azidation. After “click” polymerization, degradable and pre-cationic hyperblock of lhb -(PLA- b -PBocAEA) were achieved, which is further modified with PEG and confirmed the degradation property. Finally, degradable and cationic hyperblock lhb -(PLA- b -PAEA)-g-PEG was obtained by deprotection of amino groups. All the intermediates and products were confirmed by NMR, FT-IR and GPC measurements.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yuling Sun,Jie Liu,Zhibo Li,Jianjun Wang,Yanbin Huang
Water-soluble, biodegradable, nonionic, and biocompatible polymers with multiple functional groups are highly desired for biomedical applications. Here, we report that water-soluble nonionic poly(d/l-serine) is chirality-controllable, biodegradation-controllable, and non-cytotoxic. Hence, it can be a highly sought-after alternative to the widely used poly(ethylene glycol), with an additional advantage of having multiple hydroxyl groups for further functionalization. As one example of its biomedical applications, poly(d/l-serine) demonstrated an obvious cryoprotective effect on the red blood cells. The usage of poly(d/l-serine) in the cryopreservation field would be of great promise to resolve the difficulties in separating cryoprotectants due to toxicity.
研究领域:
生物材料学
·
医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
J.X. Bi,C.F. Xing,Y.H. Zhang,C.H. Yang,H.T. Wu
Wolframite-structured Zn 1−x Ni x ZrNb 2 O 8 (0 ≤ x ≤ 0.1) ceramics were synthesized by the conventional solid-state method. The effects of Ni 2+ substitution on sintering characteristic, crystal structure, and microwave dielectric properties of ZnZrNb 2 O 8 samples were systematically studied. The relationship among bond ionicity, lattice energy, thermal expansion coefficient and microwave dielectric properties was also investigated by the complex chemical bond theory. The dielectric constant of Zn 1−x Ni x ZrNb 2 O 8 ceramics sintered at 1150 °C slightly decreases from 28.06 to 26.35 with the increasing Ni 2+ content, which can be explained by the variation of bond ionicity and polarizability. Raman scattering spectra also reveal that the increase in Ni 2+ content leads to the shift in all the vibration modes and the variation of ionicity in Nb O bond. The Q · f values increases from about 40,000 to 60,000 GHz with the increasing Ni 2+ content, which can be explained by the variation of lattice energy. As for τ f value, it is shifted to positive direction, which can be explained in term of the variation in Nb-site bond energy. In addition, the thermal expansion coefficient plays little effect on the temperature stability of ceramics. Typically, the Zn 0.96 Ni 0.04 ZrNb 2 O 8 samples sintered at 1150 °C exhibit excellent properties with ε r = 27.10, Q · f = 62,700 GHz and τ f = −14.72 ppm/°C.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiaoping Li,Bo Hui,Quanyou Jin,Huaqiang Shi,Xinlong Lu,Li Jing,Dengwei Jing
Surfactants with various ionic properties have been broadly employed as assisting or main additives for fluid drag reduction. However, how the micellar structure of surfactants affects their turbulence drag reduction performance has not been systematically investigated, and the underlying mechanism remains unclear. In this study, we present a systematic experimental investigation of the turbulent drag reduction performance of surfactants with head groups of different ionic properties in a circular tube. By controlling such fluid parameters as surfactant ionic properties and concentration, flow time, turbulence intensity, and pH value, we were able to obtain surfactant solutions of various micellar structures, which make it possible to investigate the underlying mechanism between microscale assembly morphology and the resulting drag reduction performance of surfactants under turbulence conditions. Overall, the zwitterionic surfactant BS-12 has the best drag reduction performance, followed by the anionic surfactant sodium dioctyl sulfosuccinate and the nonionic surfactant polyoxyethylene lauryl ether, and finally the cationic surfactant hexadecyltrimethylammonium chloride. The spreading characteristics of the different types of surfactant solutions on a metal plate were experimentally investigated, and the spreading coefficient is positively correlated with turbulent drag reduction rate induced by the surfactant. The mechanism of turbulent drag reduction induced by surfactants with different ionic properties has been explored, and it turns out that the micelle structure formed by surfactants is the main cause of turbulent drag reduction. The increase in the supermolecular structure size of the surfactant molecules in solution is beneficial in improving its turbulent drag reduction performance.
研究领域:
流体力学
·
化学工程
·
界面科学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Chao Lu,Xi Chen
All-solid-state supercapacitors with high power density, lightweight and durability have shown enormous potential for sustainable energy applications . However, the insufficient mechanical and electrochemical properties of polyelectrolyte membranes restrict their energy storage performances. Here, we report a sea-island nanostructured polyvinylidene fluoride/zeolitic imidazolate framework-8 (PVDF/ZIF-8) polyelectrolyte with superior mechanical and ionic properties for boosting energy storage performances of the supercapacitors. ZIF-8 nanoparticles with 8% content were dispersed uniformly into PVDF substrate and improved ionic liquid uptake of the membrane (from 42% to 74%) because of its high surface area (764 m 2 g −1 ) and porous structure (pore width of 2.1 nm). Meanwhile, plastication effect of ZIF-8 materials improved mechanical properties of the membrane with tensile modulus of 2.88 MPa and break elongation of 11.6%. The PVDF/ZIF-8 based supercapacitors delivered a high specific capacitance of 156 F g −1 at current density of 1 A g −1 and showed good rate capability at current densities from 1 to 10 A g −1 . The device could keep working over 20000 cycles at 1 A g −1 with capacitance retention of 91.7%, showing excellent cycling stability and enormous potential for applications. This work sheds light on design of novel polyelectrolyte membranes with high electrochemical and mechanical properties for long life energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 34
·11878-11888
·
IF 4.39
Yadong Zhang,Ke Liu,Lei Wu,He Huang,Zixuan Xu,Zhouyang Long,Minman Tong,Yingqiu Gu,Zhenglong Qin,Guojian Chen
In this work, we reported a facile one-pot approach to construct polyhedral oligomeric silsesquioxane (POSS) and imidazolium-based ionic porous hypercrosslinked polymers (denoted as iPHCPs) with multiple active sites towards efficient catalytic conversion of carbon dioxide (CO2) to high value-added cyclic carbonates. The targeted iPHCPs were synthesized from a rigid molecular building block octavinylsilsesquioxane (VPOSS) and a newly-designed phenyl-based imidazolium ionic crosslinker through the AlCl3-catalyzed Friedel–Crafts reaction. The desired multiple active sites come from the mixed anions including free Cl− and Br− anions, and in situ formed Lewis acidic metal–halogen complex anions [AlCl3Br]− within imidazolium moieties and POSS-derived Si–OH groups during the synthetic process. The typical polymer iPHCP-12 possesses a hierarchical micro-/mesoporous structure with a high surface area up to 537 m2 g−1 and shows a fluffy nano-morphology. By virtue of the co-existence of free nucleophilic Cl− and Br− anions, the metal complex anion [AlCl3Br]− with both electrophilic and nucleophilic characters and electrophilic hydrogen bond donor (HBD) Si–OH groups, iPHCP-12 is regarded as an efficient recyclable heterogeneous catalyst for synergistic catalytic conversion of CO2 with various epoxides into cyclic carbonates under mild conditions. The present work provides a succinct one-pot strategy to construct task-specific ionic porous hypercrosslinked polymers from easily available modules for the targeted catalytic applications.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 44
·25760-25768
·
IF 3.43
Yaqing Wang,Wenjun Chen,Qi Zhao,Guizhen Jin,Zhimin Xue,Yingxiong Wang,Tiancheng Mu
Deep eutectic solvents (DESs) have attracted considerable attention due to their unique properties. Owing to similar structures and properties, DESs are also called “quasi-ionic liquids” or “ionic liquid analogous”. However, for a deeper understanding and application of DESs, a comprehensive investigation on the ionicity of DESs is crucial. In this work, the effects of the structure and components of typical DESs on the ionicity were investigated. Moreover, the ionicity was discussed by using Walden plot, and the validity of applying it to DESs was verified using pulsed field gradient nuclear magnetic resonance (PFG-NMR). We found that the lack of free charged species and high viscosities make it difficult to achieve optimal conductivities for DESs, and thus most of them exhibit “poor ionic” nature. Fortunately, with an in-depth understanding of its microstructure and physicochemical properties, the properties of DESs can be finely tailored by selecting or even designing suitable parent compounds for functional applications. In particular, the ionicity of Li-based DESs was investigated for their potential application as electrolytes in Li-ion batteries.
研究领域:
化学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 34
·20073-20081
·
IF 3.945
Ruifen Shi,Fengyi Zhou,Yu Chen,Zhenghui Liu,Shuzi Liu,Tiancheng Mu
Deep eutectic solvents (DESs) are well-known as novel solvents due to their unique properties, which are indispensable for the development of green chemistry in the future. CoCl2·6H2O and NiCl2·6H2O-based DESs, which could be called magnetic DESs (MDESs) for short in view of their responsive behavior to an external magnetic field, have been widely used in many industrial applications, such as biomass treatment, electrolytes, and material preparation. For better application and full-scale development of these MDESs in various fields, eleven MDESs were prepared in this work by using CoCl2·6H2O and NiCl2·6H2O as hydrogen bond acceptors (HBAs) with alcohols, carboxylic acids and amides as hydrogen bond donors (HBDs), respectively. The intermolecular interactions between the components of MDESs were characterized via FTIR, 1H NMR and DSC analysis. In addition, physicochemical properties including density, viscosity, conductivity, ionicity, pH values, surface tension, thermostability and solvatochromic parameters were investigated. All MDESs exhibit acid characteristics and have good conductivity comparable with ionic liquids (ILs) and other DESs used for electrolytes. The results show that stronger H-bonding networks in Ni-based MDESs make them have higher density, viscosity, polarity and surface tension values than Co-based MDESs. Moreover, all prepared MDESs possess a good conductivity behavior which could be comparable to that of common organic solvents and ILs. According to this work, we could better comprehend the behavior of Co/Ni-based MDESs and choose the appropriate one for particular applications.
研究领域:
化学
·
材料科学
·
绿色化学
·
工业应用
✓ 已验证
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 14
·2105787
·
IF 17.521
Jindong Chen,Qingchen Wu,Haotian Tian,Xiaotian Jiang,Feng Xu,Xin Zhao,Zheshuai Lin,Min Luo,Ning Ye
Pnictides are superior infrared (IR) nonlinear optical (NLO) material candidates, but the exploration of NLO pnictides is still tardy due to lack of rational material design strategies. An in-depth understanding structure–performance relationship is urgent for designing novel and eminent pnictide NLO materials. Herein, this work unravels a vital band gap mechanism of pnictides, namely P atom with low coordination numbers (2 CN) will cause the decrease of band gap due to the delocalization of non-bonding electron pairs. Accordingly, a general design paradigm for NLO pnictides, ionicity–covalency–metallicity regulation is proposed for designing wide-band gap NLO pnictides with maintained SHG effect. Driven by this idea, millimeter-level crystals of MgSiP2 are synthesized with a wide band gap (2.34 eV), a strong NLO performance (3.5 x AgGaS 2 ), and a wide IR transparency range (0.53–10.3 µm). This work provides an essential guidance for the future design and synthesis of NLO pnictides, and also opens a new perspective at Zintl chemistry important for other material fields.
研究领域:
材料科学
·
非线性光学
·
固态化学
·
津特尔化学
·
红外材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 7
·4092-4102
·
IF 2.956
Yunhui Zhang,Haitao Wu
La 2 (Zr 1− x Ti x ) 3 (MoO 4 ) 9 (0 ≤ x ≤ 0.1) ceramics were prepared by the traditional solid-state reaction method. XRD analysis showed that La 2 (Zr 1− x Ti x ) 3 (MoO 4 ) 9 (0 ≤ x ≤ 0.1) ceramics belonged to a trigonal system. Based on the chemical bond theory, the consequences of bond energy, bond ionicity, lattice energy, and thermal expansion coefficient of ceramics on microwave dielectric properties were discussed. As Ti 4+ addition was increased, the reduction in dielectric constant was ascribed to the fact that the polarizability of Ti 4+ is smaller than Zr 4+ , and the downward trend was related to the bond ionicity. Besides, the tendency of Q·f value depended on the packing fraction and the lattice energy. The improvement in τ f value, the increase in bond energy, and the decrease in the coefficient of thermal expansion were all correlated. The far-infrared spectra implied that the absorptions of structural phonon oscillation were the main reason for the maximum polarization contribution. La 2 (Zr 0.92 Ti 0.08 ) 3 (MoO 4 ) 9 ceramics sintered at 750°C for 4 hours exhibited the best dielectric properties ( ε r = 10.33, Q·f = 80 658 GHz, and τ f = 3.48 ppm/°C).
研究领域:
材料科学
·
陶瓷工程
·
电气工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）