JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 16
·7896-7908
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IF 4.682
Xu Tianye,Lu Shun,Wang Yajie,Gan Xiaoyan,Guo Liling,Liu Hanxing
Two-dimensional (2D) perovskite formed by introducing various organic spacer cations into 3D perovskite is considered to be one of the most effective methods to improve the humidity stability of perovskite materials. In order to solve the phase inhomogeneity and phase distribution nonuniformity of two-dimensional perovskites, additive engineering technique is widely used during their fabrication processes. Although many additives are proved to be effective in improving the quality of perovskite films, the mechanism of additive engineering has not been fully understood. In our work, we prepare 2D Ruddlesden–Popper perovskites based on 4-bromophenylethylammonium (BPEA) using a new additive of ionic liquids MAAc (methylammonium acetate). The (BPEA) 2 (MA) 4 Pb 5 I 16 perovskite prepared with the assistance of MAAc exhibits a stable photoelectric conversion efficiency (PCE) of 8.47%, which is much higher than the one without MAAc additive (4.79%). Besides a nearly tenfold increase in electron mobility, the unencapsulated (BPEA) 2 (MA) 4 Pb 5 I 16 -based device with MAAc additive remains 88% of its initial efficiency after 960 h exposure to air with a humidity of 20 ± 5% at room temperature, while the device without additive decreases to 63% of its initial efficiency. Meanwhile, the interactions between PbI 2 and MAAc at different temperatures and molar ratios are investigated and the formation mechanism of 2D perovskites in the presence of MAAc is proposed. It is found that an intermediate perovskite with distorted [PbI 6− x Ac x ] 4− octahedron is formed with the addition of MAAc, making the quality and photoelectric properties of the resultant films greatly enhanced.
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Bingxiu Xue,Fang He,Xiaopeng Zhao,Jianbo Yin
By changing the amount of vinylimidazole grafted on phenyl ring, we designed and prepared a series of topological self-crosslinked poly(ionic liquid)s (TS-PILs) with different number of spacer arms by free radical polymerization. The influences of the number of spacer arms on the electrorheological (ER) effect of TS-PILs in insulating carrier liquid were studied by rheological test under electric stimulus and the influence mechanism was analyzed by broadband dielectric spectroscopy. It was found that the ER effect of TS-PILs containing organic counterion bis(trifluoromethane sulfonylimide) (TFSI - ) increased with the increase of the number of spacer arms. Broadband dielectric spectra analysis showed that the increased ER effect with the number of spacer arms was attributed to the increase of interfacial polarization strength and the decrease of electrode polarization with the number of spacer arms. Activation energy analysis indicated that increasing the number of spacer arms could promote ion pair dissociation and ion number density but inhibit long-range movement of ions, which was responsible for the increase of interfacial polarization strength and the decrease of electrode polarization. The results provided a guidance insight for the design and preparation of high-performance crosslinked PIL-based ER materials.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 43
·期 17
·2200212
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IF 5.006
Li Wang,Qizeng Sun,Linrong Zhang,Jin Wang,Guozhang Ren,Liuyingzi Yu,Kaili Wang,Yameng Zhu,Gang Lu,Hai-Dong Yu
Organic electrochemical transistors (OECTs), especially the ones with high transconductance, are highly promising in sensitive detection of chemical and biological species. However, it is still a great challenge to design and fabricate OECTs with very high transconductance. Herein, an OECT with ultrahigh transconductance is reported by introducing ionic liquid and dodecylbenzenesulfonate (DBSA) simultaneously in poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT:PSS) as the semiconductive channel. Compared with the OECT based on pristine PEDOT:PSS, the OECT based on co-doped PEDOT:PSS demonstrates a significant enhancement of transconductance from 1.85 to 22.7 mS, because of the increase in volumetric capacitance and conductivity. The enhanced transconductance is attributed to the DBSA-facilitated phase separation between the ionic liquid and PEDOT:PSS, which helps to form conductive domains of ionic liquid in PEDOT:PSS matrix, and the partial dispersion of ionic liquid in the PEDOT:PSS phase. Furthermore, by using the interdigitated electrodes as the source and drain electrodes, an ultrahigh transconductance of 180 mS is obtained, which is superior to that of the state-of-the-art OECTs. Because of the ultrahigh transconductance, the obtained OECT demonstrates sensitive detection of hydrogen peroxide and glucose, making it promising in clinical diagnosis, health monitoring, and environmental surveillance.
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HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Peng Qi,Hongge Jia,Qingji Wang,Guiming Su,Shuangping Xu,Mingyu Zhang,Yanqing Qu,Fuying Pei
Leakage of oily industrial waste is not only a serious environmental and ecological hazard but also poses a significant health risk to people. Membrane separation, which is cost-effective and efficient, is one of the best solutions for reducing pollution discharge through oil–water separation. In this study, polydopamine (PDA) was incorporated into electrostatically spun ionic liquid-capped polyimide (IL-PI) membranes through an in situ growth method; the membranes exhibited the strong adsorption properties of PDA. The polyimide fibers were hydrophilically modified with an IL, which contains several hydrophilic groups, and PDA. Adjusting the polymerization time resulted in the formation of a composite membrane, which could effectively separate oil–water emulsions. Scanning electron microscopy analysis showed that with an increase in the PDA coating time, the PDA content in and on the surface of the composite membrane fibers significantly increased. In addition, the surface contact angle of the membrane decreased from 72.87° to 12.06° with the addition of the PDA coating, while the wettability was significantly improved. The PDA-modified fibrous membranes showed good separation of the emulsified oil–water mixtures. The maximum membrane flux and separation efficiency achieved was 280 L·m−2·h−1 and >99%, respectively. After 10 repeated cycles, the separation efficiency was maintained at >92%. This approach can be used for the design of future wastewater treatment solutions.
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RSC Advances
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2022
·Vol. 12
·期 5
·2947-2958
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IF 4.036
Jing Wang,Chengbao Liu,Bei Qian
A novel L-histidine based ionic liquid (LHIL) was developed and successfully synthesized. Its structure was confirmed by Fourier-transform infrared spectroscopy, UV-vis spectroscopy, X-ray photoelectron spectroscopy, 1H-NMR and high-resolution mass spectrometry. The outstanding corrosion inhibition effect of the LHIL on mild steel in 1 M hydrochloric acid was thoroughly evaluated by Tafel plots, electrochemical impedance spectroscopy, and localized electrochemical strategies. The results revealed that the corrosion of mild steel was effectively suppressed by the adsorption of LHIL on its surface, and the best inhibition efficiency reached 98.8%. The adsorption behavior of LHIL on steel obeyed the Langmuir adsorption isotherm, which involved both chemisorption and physisorption. Theoretical calculations indicated the strong chemisorption of LHIL on steel, as proved by the low energy gap (ΔE = 0.0522 eV) and high binding energy (Ebinding = 303.47 kcal mol−1), which clearly confirmed the effectiveness of LHIL for steel protection.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
You Yuan,Xinhua Wang,Xiaoyun Liu,Jun Qian,Peiyuan Zuo,Qixin Zhuang
Dielectric polymer composites as energy storage components greatly promote the development of high-performance power electronic devices. However, the failure under high voltage and high temperature is still the main problem to be solved. In this work, a non-covalently modified graphene@poly(ionic liquid) (RGO@PIL) nanohybrid has been elaborately designed. The π-π conjugated structure of the nanohybrid prevents the filler from overlapping and improves its dispersion, thus improving the breakdown strength by effectively extending the breakdown path. The double polymer shell structure formed after the introduction of poly(ionic liquid) not only enhances the interfacial polarization effect but also significantly transfers heat evenly within the nanocomposites avoiding failure at high temperatures. At the frequency of 1 kHz and at 200 °C, the permittivity of the nanocomposite film reaches 35.51, with a high breakdown strength of 122.96 kV/mm. This work demonstrates a promising strategy to manufacture the electronic circuit equipment materials for applications under extreme environments.
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Polymers
·
2023
·Vol. 15
·期 15
·3197
·
IF 5
Yiming Xiao,Haoran Chen,Ranxin Sun,Lei Zhang,Jun Xiang,Penggao Cheng,Huaiyuan Han,Songbo Wang,Na Tang
Despite the outstanding proton conductivity of phosphoric acid (PA)-doped polybenzimidazole (PBI) membranes as high-temperature proton exchange membranes (HT-PEMs), chemical stability is a critical issue for the operation life of PEM fuel cells (PEMFCs). Herein, we introduced polymerized [HVIM]H2PO4ionic liquids (PIL) into an OPBI membrane to accelerate proton transfer and enhance the chemical stability of the membrane. Based on the regulation of the intrinsic viscosity of PIL, the entanglement between PIL chains and OPBI chains is enhanced to prevent the loss of PIL and the oxidative degradation of membrane materials. The PIL/OPBI membrane with the intrinsic viscosity of 2.34 dL·g−1(2.34-PIL/OPBI) exhibited the highest proton conductivity of 113.9 mS·cm−1at 180 °C, which is 3.5 times that of the original OPBI membrane. The 2.34-PIL/OPBI membrane exhibited the highest remaining weight of 92.1% under harsh conditions (3 wt% H2O2; 4 ppm Fe2+at 80 °C) for 96 h, and a much lower attenuation amplitude than the OPBI did in mechanical strength and proton conductivity performance. Our present work demonstrates a simple and effective method for blending PIL with OPBI to enhance the chemical durability of the PA-PBI membranes as HT-PEMs.Keywords:poly(ionic liquid);polybenzimidazole;chemical stability;HT-PEM
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Rui Tian,Xiaohua Jia,Caiyue Huang,Yang Yu,Meng Lan,Jin Yang,Yunfeng Su,Haojie Song
With the rapid development of miniaturization and high-power portable electronics, the accumulation of undesired heat can degrade the performance of electronic devices and even cause fires. Therefore, multifunctional thermal interface materials that combine high thermal conductivity and flame retardancy remain a challenge. Herein, an ILC (ionic liquids crystal)-armored boron nitride nanosheet (BNNS) with flame retardant functional groups was first developed. The high in-plane orientation structure aerogel film made of such an ILC-armored BNNS and aramid nanofiber and polyvinyl alcohol matrix through directional freeze-drying and mechanical pressing exhibits strong anisotropy thermal conductivity (λ// of 17.7 W m–1 K–1 and λ⊥ of 0.98 W m–1 K–1). In addition, the highly oriented IBAP aerogel films have excellent flame retardancy (peak heat release rate = 44.5 kW/m2 and heat release rate = 0.8 MJ/m2) due to the physical barrier effect and catalytic carbonization effect of ILC-armored BNNS. Meanwhile, IBAP aerogel films exhibit good flexibility and mechanical properties, even in harsh environments such as acids and bases. Further, IBAP aerogel films can also be used as a substrate for paraffin phase change composites. The ILC-armored BNNS provides a practical way to produce flame-resistant polymer composites with high thermal conductivity for TIMs in modern electronic devices.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Ting Huang,Huang-xian Zhang,Xiao-hua Zhang,Da-yong Peng,Xu-liang Nie,Jing Chen,Wan-ming Xiong
A kind of functionalized diallylimidazole ionic liquids (CnDAIMF) was synthesized and applied in the dehydration of D-fructose to produce 5-HMF under the microwave radiation. The results showed that X-ray, 1 H NMR and FT-IR confirmed the production. The target ILs existed in a highly centrally symmetric, and crystalline state at room temperature, with a good thermal stability up to 300 °C (HTD ≥ 340 °C). In the experiments of conversion D-fructose to 5-HMF, 5-HMF could be obtained via the catalysis of diallylimidazole IL whether in water or DMSO. The catalytic performance of these ILs was not much different from that of solid acid (like camphor sulfonic acid or solid carbon sulfonic acid), and which was higher than that of the monoimidazole hexafluorophosphate or imidazole class bromine salt, but there were no obvious changes can be found with the variation of carbon chain length between imidazole rings in diallylimidazole IL. The effects of temperature and solvent on the reaction were more significant. The optimized yield of 5-HMF was 52.59% at 185 °C in a water-C 2 DAIMF solvent (t = 10 min), while 73.71% at 195 °C in DMSO-C 2 DAIMF solvent. Furthermore, six CnDAIMF have a considerable effect on the conversion in water and 5-HMF yield of about 50% could be obtained, which is satisfactory compared with other similar processes, especially in the microwave system of aqueous solution. Therefore, this process may be benefit for many researches and applications related to functionalized ionic liquid research and biomass conversion applications.
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Materials
·
2023
·Vol. 17
·期 1
·9
·
IF 3.4
Runkai Zhou,Hong Yang,Lianzhong Zhao,Chun Wang,Chaoqun Peng,Richu Wang,Dou Zhang,Xiaofeng Wang
In this study, polyvinylidene fluoride (PVDF) composite films were prepared by fused deposition modeling, and the effects of ionic liquid (IL) content on the printability, crystallization behavior, and electrical properties of melted PVDF were systematically investigated. The results show that the addition of IL increased the temperature sensitivity of melted PVDF and decreased its viscosity, while IL acted as a plasticizer to lower the melting point of PVDF and improve its FDM printability. The imidazole cations in IL had electrostatic interactions with the -CF2- groups in PVDF, which promoted the transformation of the nonpolar phase to the polar phase in PVDF; thus, the addition of IL was beneficial to the increase in the polar β phase. The PVDF with 20 wt.% IL contained the highest proportion of β phase content (32.59%). Moreover, the increase in polar β-phase content also increased the polarization strength of PVDF and improved its ferroelectric properties. PVDF with 10 wt.% IL had the highest residual polarization strength (16.87 μC/m2).Keywords:PVDF;3D printing;ionic liquids;piezoelectric materials;fused deposition modeling
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yunfei Yu,Xue Yang,Chenchen Zhang,Jie Chen,Wei Lin,Jianqiang Meng
Ion gel membranes show great potential for carbon capture due to their excellent solubility selectivity for CO 2 . However, poor mechanical properties and limited stability as well as low gas permeability limit their application. Here, we report a environmentally friendly and simple strategy for preparing double-network(DN) ion gel membranes with both high strength and excellent gas separation performance. We use a “one-pot method” that the first network(FN) and the second network(SN) with ionic liquid were mixed evenly, and the DN membrane was prepared under heating and UV light. Wherein the FN was obtained by a ring-opening reaction between O, O-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol and a trimethylolpropane triglycidyl ether. And the SN was obtained by free radical polymerisation between 1 and vinyl-3-ethylimidazole bis(trifluoromethanesulfonyl)imide and a p -divinylbenzene (DVB) crosslinker. The crosslinking density of FN and SN, the mass ratio of the FN to the SN, as well as the content and type of free ionic liquid were optimized to improve the mechanical and gas separation properties of the DN membrane. When the crosslinking groups reacted quantitatively, the tensile strength of DN membranes is 1.5 MPa and the elongation at break is 120 %. With the increase of free ILs content, the crystallinity as well as the glass transformation temperature of the DN membrane decreases and the CO 2 permeability increases (PCO 2 :866 Barrer α (CO 2 /N 2 ):31). When 1-ethyl-3-methylimidazolium dicyanamide was used, the CO 2 /N 2 separation performance can surpass the 2008 upper bound (PCO 2 :464 Barrer α (CO 2 /N 2 ):63). The DN membrane has better gas separation and mechanical properties than the SN membrane and shows superior combination of the permeability and selectivity. This research provides a new approach designing a tough ion gel membrane which shows great potential for practical application in carbon capture.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Fangfang Li,Yueyue Hu,Yong Cheng,Ying-Hua Zhou
Exploiting an effective catalyst for CO 2 conversion into value-added chemicals under mild circumstances still remains a challenge. Herein, UiO-66 decorated with ionic liquids (ILs) (denoted as UiO-66-ILs) were facilely synthesized by the mixed ligands of 1,4-benzene dicarboxylic acid and pyridyl-containing mono-carboxylic acid isomer (including nicotinic acid (NA), isonicotinic acid (INA), and 2-pyridine carboxylic acid (PCA)), followed by the further modification with different bromoalkanes. Among various UiO-66-ILs, UiO-66 derivative containing the ILs composed of PCA and bromoethane (named as UiO-66-ILs(PCA-EtBr)) displayed superior catalytic performance on CO 2 -epichlorohydrin cycloaddition into chloropropene carbonate, with a high yield of 90 % under 0.1 MPa CO 2 at 110 °C without the addition of any solvent and cocatalyst. Whereas, UiO-66-ILs(NA-EtBr) and UiO-66-ILs(INA-EtBr) as analogues of UiO-66-ILs(PCA-EtBr) presented a low yield of 77 % and 67 %, respectively, unveiling that the orientation of carboxyl at monocarboxyl pyridine ligand played a great influence on the catalytic activity. The excellent activity of UiO-66-ILs(PCA-EtBr) was attributed to the synergetic effect of Lewis acidity from MOF nodes for activating C–O bond of epoxide, CO 2 absorption by pyridyl moiety, and nucleophilicity of ILs decoration. In addition, UiO-66-ILs(PCA-EtBr) exhibited a broad scope of epoxide substrate, as well as a great recyclability. Moreover, a possible catalytic mechanism was proposed for CO 2 conversion into cyclocarbonate.
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