RSC Advances
·
2021
·Vol. 11
·期 60
·37760-37766
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IF 3.361
Xiaodong Yang,Jia Li,Jianhua Yao,Tianrui Ren,Bo Zhang
The precise control architectures of Cu2O crystals are very crucial, which have a significant influence on their various performances. Herein, Cu2O crystals with diverse architectures were achieved via finely adjusting the concentration of NaOH. The intriguing results showed that the addition of specific amounts of OH− to the solution was crucial to tailor the morphology and size of the resulting microcrystals. We observed the evolution of the shapes of the Cu2O microcrystals, which change from a rhombic dodecahedron to spherical, octahedral-like and then to hexapod upon the increase in the NaOH concentration. Adjusting the volume of NaOH added provides a means to vary the particle size. Furthermore, density functional theory (DFT) may reveal that OH− ions serve as an efficient coordination agent selectively adsorbing onto different crystal faces of Cu2O crystals modifying the crystal energies, inducing the structure anisotropy on crystal growth. This work reveals that an effective and facile strategy has been developed for morphology-control of Cu2O crystals.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
INORGANICA CHIMICA ACTA
·
2024
·
IF 2.7
Zhen-Qiang Qin,Wen-Hao Li,Jia-Xin Zhang,Yi-Chuan Huang,Hong-Yan Li
Four cationic Ir(III) complexes Ir1–Ir4 , [(4-fpiq) 2 Ir(L 1 )]PF 6 ( Ir1 , 4-fpiq = 1-(4-fluorophenyl)isoquinoline, L 1 = 4,4′-dibromo-2,2′-bipyridine), [(4-fpiq) 2 Ir(L 2 )]PF 6 ( Ir2 , L 2 = 5,5′-dibromo-2,2′-bipyridine), [(4-chopiq) 2 Ir(L 1 )]PF 6 ( Ir3 , 4-chopiq = 1-(4-formylphenyl)isoquinoline), [(4-chopiq) 2 Ir(L 2 )]PF 6 ( Ir4 ) were synthesized using 2,2′-bipyridine derivatives as neutral ligands. These complexes show decent orange and red phosphorescence (λ em = 576–618 nm) with quantum efficiencies of 0.13–0.37. The influence of substituents in the ligands on the photophysical and electrochemical properties of the Ir(III) complexes was investigated by UV–vis absorption and emission spectra and cyclic voltammograms and simulated by density functional theory (DFT) calculations. Upon addition of OH − ions to the solutions of Ir1–Ir4 , all the complexes exhibited a turn-on response to OH − with a low detection limit on the order of 10 −6 M, and high selectivity to OH − was demonstrated.
研究领域:
分析化学
·
配位化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Zhili Li,Feng Rao,Shaoxian Song,Alejandro Uribe-Salas,Alejandro López-Valdivieso
Effects of common ions, namely hydroxyl ions and carbonate, on the adsorption and flotation of malachite with salicylaldoxime as a collector was investigated, making use of solubility, micro-flotation, zeta potential , contact angle, FTIR, and XPS measurements. The results suggested that hydroxyl and carbonate ions affect malachite recovery through altering solubility of this mineral. Under conditions of lower solubility, more stable copper atoms acted as adsorption sites for retaining salicylaldoxime on the malachite surface, and the collector consumed by copper species in slurry was reduced. This allowed more collectors to get adsorbed onto malachite surface, resulting in improved malachite recovery. Zeta potential, FTIR, and XPS measurements indicated that salicylaldoxime chemically adsorbs onto malachite by forming copper salicylaldoxime chelates, in which two salicylaldoxime molecules react with one copper atom by N atom and the O atom combined with benzene ring .
研究领域:
矿物加工工程
·
表面化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Han Jia,Haidong Jia,Qiuxia Wang,Hui Yan,Xu Li,Bowen Wang,Shaoyan Wang,Yuanbo Wang,Qiuyu Xie,Lin Song,Kaihe Lv,Pan Huang
Ionic liquids (ILs) are incredibly efficient additives to solve wellbore instability resulting from shale hydration. The influence of the molecular structure of ILs on their inhibition performance has been investigated intensively, and hydroxyl is regarded as the significant group to improve their inhibition performances. In this study, three novel dihydroxyl ionic liquids (DHILs) including [C 4 DIPA]Br, [C 8 DIPA]Br, and [C 12 DIPA]Br were successfully synthesized. Then their thixotropy and inhibition properties were evaluated via three-interval thixotropy tests (3ITTs), hot-rolling recovery tests, immersion tests, and linear swelling tests. [C 12 DIPA]Br exhibited the optimal inhibition ability at a low concentration (0.5 wt%) and was more effective than the conventional inhibitor KCl (2 wt%). Various techniques were used to analyze the inhibition mechanism of DHILs including contact angle measurements, zeta potential , X-ray diffraction, and Flourier transform infrared spectroscopy . The results demonstrated that the synergistic effects of hydrogen bonding , electrostatic interaction, and hydrophobic shield should be responsible for the excellent inhibition performance and great thermal stability of [C 12 DIPA]Br. Finally, the proposed mechanism was supported by the control experiments using other three ILs inhibitors and molecular dynamics simulation . Our work provided unique perspectives on developing rationally designed and efficient ILs inhibitors.
研究领域:
石油工程
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化学工程
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Xiaoshu Lv,Jingyuan Zhang,Xingan Dong,Jian Pan,Wendong Zhang,Weilu Wang,Guangming Jiang,Fan Dong
We demonstrated the partial Ni 2+ substitution for Mg 2+ in Mg 2 Al-layered double hydroxide nanosheet (Ni/LDH) significantly improved its photocatalytic performance in removing the ppb-level NO pollutant from air. With 25 % of Mg 2+ substituted, the Ni/LDH delivered the highest NO removal efficiency of 42.10 % (87.2 % of them were mineralized to nitrate) under UV-light irradiation. Such a robust performance with the low energy input (8 W) made Ni/LDH among the top photocatalysts for NO removal. We evidenced the OH − carried by Ni/LDH transformed to · OH radicals by trapping the photoexcited holes. This unique feature was intriguing as the OH − at layer surfaces of LDH were abundant, fully exposed and dynamically supplemented by atmospheric water, which endowed Ni/LDH with superior · OH production capability even under low atmospheric moistures. The positive contribution of Ni 2+ arose from its function in optimizing band structure and activating the OH − of LDH, leading to enhanced reactive oxidative species production.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Haidong Jia,Han Jia,Yi Lu,Xiaowei Li,Chunping Guo,Chuanqi Li,Zhihao Shen,Pingan Pei,Han Sun,Kaihe Lv,Pan Huang
A novel ammonium-derived dihydroxyl ionic liquid ([C 16 DPOA]Br) and a control ionic liquid ([C 16 DPA]Br) are synthesized to reveal the effect of dihydroxyl and head groups on their inhibition property via the weight-loss method, surface analysis, electrochemical measurements, and adsorption isotherm studies. [C 16 DPOA]Br exhibits the optimal inhibition ability (93.47 %) for mild steel in 1 M HCl in contrast to [C 16 DPA]Br (88.03 %) and the traditional cationic surfactant CTAB (92.34 %). Based on the experimental results, it can be inferred that the short alkyl chain (propyl) impedes the tight alignment of [C 16 DPA]Br on the metal surface and the interactions between hydroxyl and iron atoms enable [C 16 DPOA]Br to overcome the negative effects of the short alkyl chain on the inhibition property. Finally, molecular electrostatic potential (MEP) distribution and molecular dynamics (MD) simulation verify the reactive sites and adsorption capacity of corrosion inhibitors from the microscopic scale, which further confirms the proposed mechanism. This study focuses on the significance of dihydroxyl and head groups on the inhibition property and provides unique insights into the development of efficient ionic liquid corrosion inhibitors.
研究领域:
材料科学
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腐蚀与防护
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表面科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jialin Zhao,Jian Gao,Jiayao Yang,Yijia Lei,Yanchao Zhang,Yiman Gu,Yan Wang,Wenyu Gao,Jin-bo Zhao,Zhe Wang
In this work, the “one-pot method” involving green and efficient ultrastrong acid catalysis was used to polymerize a series of anion exchange membranes (AEMs) without aryl ether bonds, which required no complex postprocessing steps and was in line with the goal of sustainable research, as the method had low cost and clean synthesis. Moreover, by doping hydrophobic thiophene groups and hydrophilic piperidinium cationic groups into the AEMs to create high-speed ionic channels while inhibiting swelling, we provide the solution to the “trade-off” problem between conductivity and dimensional stability. Multiple morphological analyses confirmed that the interconnected ion transport channels created by this structure accelerated OH– ion transport in AEMs up to 152.57 mS cm–1 at 80 °C. At the same time, the synthesized membrane showed optimum dimensional stability (WU of 56.89% and SR of 18.87%). In addition, the membrane had excellent chemical stability, maintaining a 90.78% conductivity retention (80 °C) after immersion in a 3 M NaOH solution for 1000 h. In the final single-cell test (80 °C), the QPTPSF-15 membrane with the best overall performance achieved a peak power density of 536 mW cm–2. This green strategy for the preparation of high-performance membranes addresses the limitations in the synthesis of current AEMs and provides a sustainable approach to the design and development of fuel cells.
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
ChemistrySelect
·
2023
·Vol. 8
·期 48
·e202303484
·
IF 2.1
Liwei Sun,Jiaojiao Zhao,Lixin Liang,Xiaolong Gao,Yuxia Sun,Guangjin Hou,Yuehui Li
Graphical New polyhydroxy ionic polymers, poly(1-(2-hydroxyl-ethyl)-3-vinyl-imidazolium bromide)- co -polystyrenes (P[HeVim][Br]- co -PSs), were obtained and used as effective heterogeneous catalysts for the cycloaddition of epoxides and pure CO 2 or 12 vol % CO 2 /N 2 under co-catalyst- and solvent-free condition. Polyhydroxyl groups synergistically promote the ring opening step of epoxide and thus complete cycloaddition selectivity was obtained. New polyhydroxy ionic polymers were designed and prepared to heterogeneously catalyze CO 2 cycloaddition reaction with complete chemoselectivity and up to 99 % yields. Using copolymer of 1-(2-hydroxyl-ethyl)-3-vinyl-imidazolium bromide ([HeVim][Br]) and styrene, the highest yield of propylene carbonate was obtained. And, it is significantly higher than that obtained with the same amount of hydroxy monomer [HeVim][Br] (only 24 % yield), thus showing the concerted promotion effect of polyhydoxyl groups during ring opening of epoxides. The catalyst presented excellent recycling performance (10 cycles). Various terminal cyclic carbonates were synthesized with above 95 % yields. A synergistic function of hydroxyl group as efficient hydrogen bonding donor and bromide anion as nucleophilic agent was put forward.
研究领域:
材料科学
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催化
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绿色化学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Fahui Li,Yiyue Shen,Yupei Deng,Jingchun Zhang,Qiqi Wang,Haoyuan Chen,Mai Ouyang,Qianwen Jiang,Guowei Wang,Linghua Zhuang
Ionic liquids (ILs) have emerged as a promising class of green solvents suitable for cellulose dissolution. In this study, two dihydroxyl-functionalized ionic liquids, 1-methyl-3-(2,3-dihydroxypropyl)-imidazolium chloride ([DPmim]Cl) and 1-butyl-3-(2,3-dihydroxypropyl)-imidazolium chloride ([DPbim]Cl), were prepared for microcrystalline cellulose (MCC) dissolution. The physical properties of [DPmim]Cl and [DPbim]Cl, such as relative viscosity, density, electrical conductivity, and Kamlet-Taft parameters (β and π*), were evaluated. The dissolution and regeneration properties of MCC in [DPmim]Cl and [DPbim]Cl were investigated. The regenerated MCC was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Density functional theory (DFT) simulations were used to investigate the interactions between ionic liquid and cellobiose. [DPmim]Cl and [DPbim]Cl, with higher β-values (0.975 and 1.098) respectively, exhibited stronger hydrogen bonding alkalinity. This increased alkalinity enhanced their ability to accept hydrogen bonds from cellulose, which in turn weakened the inter- and intra-molecular hydrogen bonds within cellulose. As a result, the dissolution of MCC was promoted. The dissolution of MCC in [DPmim]Cl was faster than [DPbim]Cl at same temperature. FTIR, TGA, and XRD characterizations showed that the hydrogen bonding network of microcrystalline cellulose was disrupted during ionic liquid dissolution. DFT simulations unveiled the formation of strong hydrogen bonds between the hydroxyl groups of ILs and the hydroxyl or ether linkages in cellulose. These hydrogen bonds have been identified as a potential crucial factor in facilitating the dissolution of cellulose.
研究领域:
化学
·
材料科学
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物理化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）