Materials Horizons
·
2022
·Vol. 10
·期 3
·908-917
·
IF 15.717
Hong-Qin Wang,Zi-Yang Huang,De-Wei Yue,Fang-Zhou Wang,Cheng-Hui Li
Pneumatic-powered actuators are receiving increasing attention due to their widespread applications. However, their inherent low stiffness makes them incompetent in tasks requiring high load capacity or high force output. On the other hand, soft pneumatic actuators are susceptible to damage caused by over-pressuring or punctures by sharp objects. In this work, we designed and synthesized a coordination adaptable network (PETMP-AIM-Cu) with high mechanical rigidity (Young's modulus of 1.9 GPa and elongation <2% before fracturing) as well as excellent variable stiffness property (soft-rigid switching ability σ as high as 3 268 000 when ΔT = 90 °C). Combining PETMP-AIM-Cu with a self-healing elastomer based on dynamic disulfide bonds (LP-PDMS), we fabricated a new pneumatic actuator which shows high load capacity at room temperature, but can also easily deform upon heating and thus can be actuated pneumatically. Benefiting from the excellent self-healing ability of PETMP-AIM-Cu and LP-PDMS, the entire pneumatic actuator can still be actuated after being cut and healed. Such a variable-stiffness and healable pneumatic actuator would be useful for complex environmental applications.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Kun Yuan,Kehuai Feng,Sheng Liao,Xiaoning Liao,Yichen Zou,Dan Hou,Xuliang Nie,Wanming Xiong
In recent years, functionalized ionic liquids (ILs) have attracted widespread interest due to their unique physicochemical properties. Accordingly, in this work, a series of phenyl-coupled diimidazolium hexafluorophosphate ionic liquids (P-DRIMF) with different R-groups in the sidechain of the imidazolium ring were synthesized and characterized. Moreover, their electrochemical properties, e.g., electrochemical window, impedance, and stability, were further investigated via electrochemical analysis. Results showed that the IR, 1 H NMR, and X-ray diffraction of P-DRIMF match well with the expected structures, as well as they were crystallized and belong to monoclinic or triclinic systems. On the other hand, the electrochemical window could increase from 2.73 V to 3.28 V with the extended alkyl sidechain R-group of the imidazolium ring, and the unsaturated vinyl group would result in a worse electrochemical window. Notably, modified glassy carbon electrodes (ILs/GCE) could perform low impedance, high stability, and improve the electrochemical response. In this case, there was a 2- to 4-fold improvement in response to phenolic compounds, while the response to other compounds still needs further improvement. Overall, this work may shed light on the design of ILs and their applications in electrochemistry.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jifang Fu,Yufeng Xu,Linna Dong,Liya Chen,Qi Lu,Mengmeng Li,Xingfa Zeng,Sanwei Dai,Guorong Chen,Liyi Shi
In this work, we have successfully synthesized a series of multiclaw-shaped octasilsesquioxanes functionalized ionic liquids and then used it developing novel hybrid solid polymer electrolytes (SPEs) with high room temperature ionic conductivity. The effect of POSS ionic liquids with varying chain in imidazole on the microstructures, thermal stabilities and electrochemical properties of the obtained SPEs were studied. The scanning electron microscope images of SPEs membranes confirm that the POSS ionic liquids were uniformly distributed in the polymer matrix. The solid polymer electrolytes exhibit high electrochemical stabilities with a wide electrochemical window up to 5.0 V, a lithium-ion transference number ( t Li+ ) of 0.32 and high ionic conductivity of 3.06 × 10 −4 S cm −1 at 22 °C. Moreover, the Li/LiFePO 4 cells containing POSS-ILs-SPEs exhibit excellent cycling performance and rate capability, the initial discharge capacity is 150.7 mAh g −1 and initial coulombic efficiency is 100% at a rate of 0.1C. The capacity of the cells can reach to 130 mAh g −1 and the coulombic efficiency is 99.9% after 90 cycles.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 31
·10970-10976
·
IF 4.174
Xianqiang Huang,Yuquan Qi,Yuxiao Gu,Shuwen Gong,Guodong Shen,Qiang Li,Jikun Li
A synthetic pathway for the directed preparation of three novel polyoxovanadate-based copper frameworks (POVCFs), i.e., [Cu0.5(1-ipIM)2]2[V4O11] (POVCF 1), [Cu(1-ipIM)2](VO3)2 (POVCF 2) and [Cu(1-pIM)4](HpIM)4[V10O28] (POVCF 3) (1-ipIM = 1-isopropylimidazole; 1-pIM = 1-propylimidazole) using bifunctional imidazole molecules as organic ligands and base has been developed. Systematic studies revealed that the variable base enviroment in the reaction is the key step in the preparation of 1D to 3D supermolecular networks of POVCFs 1–3. Single crystal X-ray diffraction analyses demonstrated that the Cu2+ atoms of POVCFs 1–2 were coordinated with four imidazole derivative molecules and two different polyoxovanadate {[V4O11]2− and [V10O28]6−} clusters, respectively, exhibiting a [CuN4O2] binding set and a distorted octahedral geometry. Specifically, POVCF 1 exhibited adjacent [V4O11]2− that dangle up and down arranged in a parallel 2D network and further coordinated with [Cu(1-ipIM)4]2+ to form a 3D supramolecular structure. However, POVCF 3 presented one tetrahedral coordinated vanadium atom and one four-coordinated copper atom and they further gave rise to a 1D network by the Cu–O and V–O bonds. More importantly, these POVCFs were further studied in the construction of C–N bond reactions of primary amines under mild conditions, and it was found that POVCF 1 displayed efficient heterogeneous catalytic activities in the Chan–Lam reaction (yields up to 89%).
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JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Sehee Kang,Yongchul G. Chung,Jo Hong Kang,Hojun Song
In this study, dual amino group functionalized imidazolium amino acid ionic liquids (AAILs) were synthesized from imidazole , bromoalkylamine, and amino acids. 1-(3-aminopropyl)-3-(2-aminoethyl)imidazolium hydroxide ([Apaeim][OH]), 1-propyl-3-(2-aminoethyl)imidazolium hydroxide ([Paeim][OH]), and 1-ethyl-3-(2-aminoethyl)imidazolium hydroxide ([Eaeim][OH]) were synthesized in two-steps, while [Apaeim][amino acid], [Paeim][amino acid], and [Eaeim][amino acid] were synthesized in three-steps. The structures of the synthesized AAILs were confirmed by 1 H NMR analysis. Moreover, the CO 2 absorption mechanism of [Apaeim][OH] was confirmed by FT-IR and 13 C NMR analyses. Subsequently, CO 2 absorption-desorption tests were conducted under at 15 vol% CO 2 , 313 K and atmospheric pressure. The cation and anion effects on the ionic liquid absorbents were also investigated. Among the tested ionic liquid solutions, 30 wt% [Apaeim][OH] and 30 wt% 1-(3-aminopropyl)-3-(2-aminoethyl)imidazolium alaninate ([Apaeim][ala]) displayed the best performances. Thus, both presented CO 2 cyclic capacities 2.2-fold higher than that of the benchmark CO 2 absorbent 30 wt% monoethanolamine (MEA), while their viscosities were comparable to that of 30 wt% MEA. Notably, 30 wt% [Apaeim][ala] show great potential as a CO 2 absorbent due to its high CO 2 cyclic capacity and low viscosity.
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JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Xingyu Liu,Jinwei Gao,Guofu Zhou,Wanqiang Liu,Qianming Wang,Yuhui Zheng
The colloidal synthesis of nanoscale perovskites has generated intensive interests very recently and most of the preparation processes are performed in organic phases due to requirement of maintaining the stability. Since the exploration of CsPbX 3 assembly in aqueous medium is still rarely reported in recent years, we use the simple organic building block (2-methylimidazole, MEIM) for the first time to collect the mixture of two metal precursors (CsBr and PbBr 2 ) and CsPbBr 3 /MEIM nanocrystals have been perfectly formed with the aid of the effective organic layer in terms of coordination interactions with metal ions . Such lead halide perovskite material with diameters of 8–10 nm possesses stable and green-emitting feature in pure water. Extensive experimental conditions including reaction time, reagent ratio, addition sequence, pH/temperature dependence and solvent effect have been investigated in details. This study finds a new way to the controllable synthesis of perovskite nanoparticles in eco-friendly solvents and represents a next generation target material for utilization in opto-electronic fields.
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Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 15
·1932-1940
·
IF 3.692
Nianming Jiao,Yanqiang Zhang,Hao Li,Long Liu,Suojiang Zhang
Graphical Yes, it is rocket science ! Both the cations and the anions of hypergolic ionic liquids, [bis(imidazolyl)–BH 2 ] + [bis(triazolyl)–BH 2 ] − (see figure), were functionalized with B−H groups and azoles, which play the roles of ‘hypergolic triggers’ and ‘regulators’, respectively. These ionic liquids show great promise as sustainable rocket fuels. [Bis(imidazolyl)–BH 2 ] + [bis(triazolyl)–BH 2 ] − and [bis(imidazolyl)–BH 2 ] + [tris(triazolyl)–BH] − were synthesized, the cations and anions of which were functionalized with B−H groups and azoles. As B−H groups contribute to the hypergolic activity and azole groups improve the energy output, the resulting ionic liquids exhibited ignition delay times as low as 20 ms and energy outputs as high as 461.1 kJ mol −1 . In addition, densities (1.07–1.22 g cm −3 ) and density-specific impulse (≈360 s g cm −3 ) values reached a relatively high level. These ionic liquids show great promise as sustainable rocket fuels.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Xueqi Sun,Shaojuan Zeng,Kuilin Peng,Wei Liu,Lu Bai,Yanchi Jiang,Tao Wang,Xiangping Zhang
The development of novel functionalized solvents with low volatility, high mass capacity, and low energy consumption for CO2 capture technology is still a significant challenge. In this study, two triazole-functionalized ionic liquids (TFILs) were designed and combined with imidazole organic solvents as phase separation agents to form novel biphasic solvents for CO2 capture. When the mass ratio of [N2222][1,2,4-Triz]/1-methylimidazole (N-MI) was 5:4, the CO2 capacity reached 0.112 g of CO2/g of solvent at 40 °C and 1 bar, in which the CO2-rich phase accounts for 95% of the total CO2 capacity and 60% of the total volume. Meanwhile, the energy consumption for CO2 desorption of [N2222][1,2,4-Triz]/N-MI (5:4) was 1.29 GJ/ton CO2, which is 65.78% lower than that of 30 wt % MEA aqueous solution. The results indicated that [N2222][1,2,4-Triz] can react with CO2 to produce carbamate that existed in the CO2-rich phase. Therefore, the original homogeneous liquid was transformed into liquid–solid phase during CO2 absorption due to the great difference in polarity between imidazole organic solvents and carbamate products, as well as strong intermolecular hydrogen bonding between carbamate products. This study provides useful guidance for designing novel phase-change solvents with high CO2 absorption performance and low energy consumption.
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IONICS
·
2024
·
IF 2.4
Yan Qiang,Zhu Wenxu,Ma Xiaoxue,Liu Na,Liu Yucheng,Xia Meichen
A series of ether-functionalized paramagnetic ionic liquids, 1-(2-methoxyethyl)-3-alkylimidazolium tetra thiocyanate cobalt [C n 2O1IM] 2 [Co(NCS) 4 ] ( n = 1, 2, 3), was synthesized and characterized. The density, surface tension, refractive index, and electrical conductivity of these ionic liquids were measured at 293.15 to 343.15 K at intervals of 5 K, and their thermal expansion coefficients α were calculated. The molecular volume was obtained by measuring the pore volume and porosity. Based on Glasser theory, the standard entropy S 0 (298 K), lattice energy U POT , surface entropy S a , and surface enthalpy, H of the ionic liquids were calculated, and the reason why the ionic liquid is in a molten state at room temperature was explained from the perspective of lattice energy. The molar surface Gibbs energy was introduced to improve the traditional Eötvös equation, which was combined with the refractive index to estimate the surface tension, obtaining a fitting index exceeding 0.99. Finally, the relationship between the electrical conductivity of the ionic liquids and temperature was investigated, and the activation energy, molar electrical conductivity, and electrical conductivity diffusion coefficient of the ionic liquids were obtained. The relationship between their properties was summarized. Compared with previously reported ionic liquids using 1-(2-methoxyethyl)-3-methylimidazolium as a cation, this type of ionic liquid has higher density and a smaller coefficient of thermal expansion.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Xiang Gao,Ao-Qi Yang,Wen-Bei Yu,Jia-Cong Zhou,Mao-Jun Pei,Jia-Cheng Chen,Wei Yan,Guo-Qiang Luo,Yao Liu,Jian-Hua Xiao,Jiujun Zhang
Traditional trial-and-error methods are inefficient and costly in discovering novel solvents for next-generation magnesium (Mg) metal-based batteries. Therefore, this work establishes a simple yet efficient screening criterion for solvents by integrating artificial intelligence techniques with a virtual molecular database, potentially revolutionizing the traditional solvent design pathway. A total of 823 solvents are generated using a self-developed algorithm, and LUMO, ΔLUMO, ESP min , ESP max , and E b are identified to establish the screening criterion through the analysis with machine learning (ML) models. Eighteen candidate solvents are successfully identified, and two of which are subsequently selected and experimentally validated, i.e., C1COCOC1 and COCC(C)OC (abbreviated as “DOX” and “DMP”). Notably, neither of these solvents has been previously reported for use in Mg batteries. Experimental results indicate that the DOX solvent, when paired with the Mg boron-based salt, i.e., Mg[B(hfip) 4 ] 2 , can significantly enhance the electrochemical performance. At a current density of 1.0 mAcm −2 , the average coulombic efficiency for Mg plating/stripping reaches 99.54 % after 5200 cycles. Furthermore, the Mg//Cu cell achieves a cumulative capacity exceeding 2000 mAhcm −2 , surpassing previously reported results. In summary, this work establishes a virtual molecular database and develops a streamlined screening methodology for Mg battery solvents based on their physicochemical properties, reducing the candidate pool from 823 to 18 and improving efficiency by nearly 50-fold. This research paradigm is not limited to the development of Mg batteries and can be readily extended to the exploration of other battery systems.
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