ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Yupeng Liu,Bingzhe Wang,Yunsen Zhang,Jia Guo,Xiaoyi Wu,Defang Ouyang,Shi Chen,Yeqing Chen,Shuangpeng Wang,Guichuan Xing,Zikang Tang,Songnan Qu
Carbon dots (CDs) are a burgeoning star of luminescent carbon-based nanomaterials with emerging interest for various applications. Luminescence from the sp 2 -conjugated domains in the carbon cores is considered to be the intrinsic bandgap emission of CDs, whereas the relationship between them remains poorly understood. Simultaneously, the solvent relaxation of water molecules will quench the fluorescence of CDs, thus, obtaining strong luminescence from CDs aqueous solutions remains a great challenge. Herein, a facile one-step spatial-confined cross-condensation method that uses a heat-induced self-foaming process in ambient pressure has been developed to synthesize highly luminescent CDs with unprecedented photoluminescence quantum yield (PLQY) over 97.2% in water. The unique precursor-derived cross-arranged perylene skeleton in the cores hinders π–π stacking, while the hydrophobicity of the conjugated units mitigates solvent relaxation by water molecules, resulting in near-unity PLQY in aqueous solutions, enabling this to demonstrate the first optically pumped green lasing emission in the CDs aqueous solution. Moreover, a biomaterial-based white light emitting diode is fabricated using the CDs-stained silks as a fluorescence conversion cover to realize a high luminous efficiency of 60.7 lm W −1 with CIE color coordinate of (0.33, 0.35).
研究领域:
材料科学
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光学工程
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纳米技术
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
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IF 2.045
Kelei Zhuo,Hao Ren,Yujing Wei,Yujuan Chen,Jingjing Ma
Activity coefficients of the 1-alkyl-3-methylimidazolium bromide [Cnmim]Br (n = 3 to 8) ionic liquids (ILs) in fructose + water mixed solvents at 298.15 K were determined by cell potential measurements. The molalities of [Cnmim]Br ranged from (0.005 to 0.1) mol·kg–1 and those of fructose from (0.2 to 0.8) mol·kg–1. Gibbs free energy interaction parameters were also obtained together with salt constants. The interactions between [Cnmim]Br and fructose are mainly controlled by electrostatic interactions. Gibbs free energy interaction parameters (gES) and salting constants (kS) are negative for the ILs (n = 3 to 6), indicating fructose are salted-in by the ILs in water, whereas fructose are salted-out by the ILs (n = 7 and 8).
研究领域:
化学
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物理化学
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DOI
高影响因子
INORGANICA CHIMICA ACTA
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2024
·
IF 2.7
Guang-Li Zhou,Bo-Wen Liu,Guang-Yu Cui,Wei Zhang,Ji-Min Yang
Radioactive iodine waste from the nuclear industry poses a critical threat to human health, and its effective capture has become an important research topic. In this study, modified UiO-66-X adsorbents (where X is ATA, BTA, or STA) were used to investigate the effects of the free functional groups in the UiO-66 skeleton on iodine capture in the vapor and solution states. The adsorption behavior revealed that the capture efficiency of UiO-66-ATA was substantially higher than that of UiO-66-BTA and UiO-66-STA because the electron-donating amino groups could enhance the I − I···π halogen bond interactions compared with the electron-withdrawing carboxyl and sulfonic acid groups. In addition, the pore volume of UiO-66-ATA was significantly higher than those of UiO-66-BTA and UiO-66-STA. In particular, the removal uptakes of UiO-66-ATA were 1108.1 mg/g (vapor phase) and 3601.9 mg/g (aqueous solution). This study is the first to investigate the effects of functional groups on the adsorption uptake of UiO-66 toward iodine. This efficient functional group modification strategy holds significant promise for the development of novel metal–organic framework adsorbents.
研究领域:
材料科学
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环境科学
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核能工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
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2023
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IF 2.6
Xianjiao Meng,Zhichun Li,Wenbing Ma
In this study, we have successfully synthesised a novel fluorescent chemosensor TM using rhodamine as the fluorophore and 8-hydroxyquinoline as recognition group through traditional Schiff base preparation methods. The chemical structure of sensor TM was characterised by 1H NMR, 13C NMR and ESI-MS. Sensor TM showed obvious fluorescence enhancement response to Hg2+ ion. The detection limit was 0.05 μM, and the solution colour changed from colourless to pink, making it a promising probe for effective naked-eye detection of Hg2+. The results of Job curve indicated that sensor TM and Hg2+ ion coordinated with each other with a binding stoichiometry of 1:1, and the pH test results showed that sensor TM was only suitable for acidic and neutral conditions.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
·
IF 4.291
Jian-Bo Chen,Taishan Yan,Chaofeng Wang,Ruixia Gao,Silong Xu,Guijuan Fan,Xueyan Zhao,Yu Liu
The dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50), as an outstanding representative of nitrogen-rich energetic salts, has recently attracted increasing interest due to its excellent performances. However, it is unclear about the photostability and degradation pathways of TKX-50 in aqueous solution. In this paper, the photostability and the degradation process of TKX-50 in aqueous solution have been comprehensively studied for the first time. TKX-50 can keep stable toward visible light. However, it presented a rapid degradation with rate constant of 0.0054 s −1 under 254-nm light irradiation. TKX-50 also demonstrated much faster photodegradation than traditional nitro explosives. Further, degradation products of TKX-50 were analyzed by high-resolution mass spectrum with theoretical calculations. The photodegradation pathways are proposed that 5,5′-bistetrazole-1,1′-diolate (BTO) anion of TKX-50 can been fragmented into the nitrile by losing N 2 and HNO, and then hydroxylammonium (NH 3 OH + ) from TKX-50 reacts with the nitrile through the nucleophilic addition. Besides as a solvent, water also may accelerate the photodegradation of TKX-50 probably by hydrolyzing the intermediary nitrile products. In a word, this study provides comprehensive understanding about the photostability of TKX-50 in aqueous solution, and it is helpful to study the photochemistry of other energetic ionic salts based on BTO.
研究领域:
化学
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材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Baoguo Zhang,Li Wang,Yubao Liu,Yongjian Zhang,Lipeng Zhang,Zhongning Shi
The electrochemical extraction of reactive metals, such as Li, Mg, Al, Ti, and rare-earth metals, from different electrolyte systems at low temperatures has been a longstanding challenge in the field of electrochemical extractive metallurgy. Water is an excellent green solvent; therefore, the electrodeposition of aqueous solutions of reactive metals would be more sustainable than traditional approaches involving molten salts and organic solvents. Inspired by the successful application of water-in-salt electrolytes for battery chemistry, we attempted the electrochemical extraction of metallic Li from water via its deposition on different substrates. We found that Li can be electrodeposited in the form of Li-based alloys and hydroxides, as identified by X-ray diffraction and X-ray photoelectron spectroscopy analysis, under certain conditions, and the mechanisms behind the observed electrochemical behaviour are discussed using different characterisation techniques and density functional theory calculations. In addition, the prospects for the electrodeposition of reactive metals from aqueous solutions are considered, and suggestions for further study are made. Thus, this work provides important insights regarding the electrochemical extraction of reactive metals from water at room temperature, and we believe that this work forms a basis for the development of safer batteries, as well as advanced electrodeposition and electrometallurgy technology.
研究领域:
材料科学
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电化学
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冶金学
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DOI
高影响因子
POLYMER
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2017
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IF 3.684
Zhukang Du,Feng Wang,Xueyi Chang,Jun Peng,Biye Ren
Percec-type substituted benzyl alcohol mini-dendrons as new hydrophobic end-cappers can effectively improve the thickening performance of hydrophobically modified ethoxylated urethanes (HEURs) in aqueous solution. To demonstrate the effects of substituted structure of Percec-type mini-dendritic end groups on aggregation and rheological properties of HEURs in aqueous solution and latex, three model HEURs end-functionalized by mono-, di- and tri-substituted benzyl alcohol mini-dendrons were synthesized, respectively. For a reasonable comparison, the total carbon number of substituted alkyl tails is set to be 24 for the three mini-dendritic end groups: HOCH 2 - Ph -C 24 H 49 ( C24 ), HOCH 2 - Ph -(C 12 H 25 ) 2 ( 2C12 ) and HOCH 2 - Ph -(C 8 H 17 ) 3 ( 3C8 ), which respectively correspond to single-, two- and three-tail according to their substituted degrees. Interestingly, rheological properties of these HEURs in aqueous solution and latex significantly depend on the substituted degree of mini-dendritic hydrophobes. The high-substituted mini-dendritic hydrophobes help HEURs to form a strong physical network with high thickening performance and fast relaxation in both aqueous solution and latex, because shorter alkyl tails in high-substituted dendritic hydrophobes will lead to a smaller aggregation number and a lower rheological activation energy . This work not only provides new insights into the connection of networks in solutions of mini-dendron functionalized HEURs but also offers a new approach to preparation of high performance thickeners used in water-borne systems.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Yaqi Ding,Neng Gao,Yongping Wu,Yongmei Xuan,Guangming Chen
Calcium chloride (CaCl2) aqueous solution as a liquid desiccant has the disadvantage of low vapor pressure and easy crystallization. Ionic liquids (ILs) such as [Emim]Cl, [Emim]Ac, and [Emim]Br have been verified to have a good ability to reduce the vapor pressure. In this paper, the vapor pressures of four kinds of CaCl2 + ILs + H2O were measured, which were CaCl2 + [Emim]Br + H2O (mass ratio CaCl2/[Emim]Br = 2:1) at temperatures of between 311.10 and 394.45 K, CaCl2 + [Emim]Cl + H2O (mass ratio CaCl2/[Emim]Cl = 2:1) at temperatures of between 306.58 and 393.89 K, CaCl2 + [Emim]Ac + H2O (mass ratio CaCl2/[Emim]Ac = 2:1) at temperatures of between 304.93 and 382.71 K, and CaCl2 + [Emim]NO3 + H2O (mass ratio CaCl2/[Emim]NO3 = 2:1) at temperatures of between 312.46 and 391.80 K, with the mass fraction of solute ranging from 0.2 to 0.5. The Antonie-type equation was used to fit the measured results. The average absolute relative deviation (AARD %) values of the measured vapor pressures and calculated vapor pressures were 0.52, 0.40, 0.33, and 0.27%, which showed good consistency and accuracy. Comparing the vapor pressures of the different solutions at the same concentration, the following order of the four anions with the ability to reduce the vapor pressure of CaCl2 + H2O can be drawn at a mass fraction of 0.4: Br– > Cl– > NO3– > Ac–.
研究领域:
化学工程
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热力学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2023
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IF 3.3
Zhuanfang Jing,Yongquan Zhou,Toshio Yamaguchi,Koji Ohara,Jianming Pan,Guangguo Wang,Fayan Zhu,Hongyan Liu
The underlying recognition mechanisms of alkali metal ions by crown ethers in aqueous solutions are yet to be fully understood at the molecular level. We report direct experimental and theoretical evidence for the structure and recognition sequence of alkali metal ions (Li+, Na+, K+, Rb+, and Cs+) by 18-crown-6 in aqueous solutions by wide-angle X-ray scattering combined with an empirical potential structure refinement modeling and ab initio molecular dynamics simulation. Li+, Na+, and K+ are located in the negative potential cavity of 18-crown-6, with Li+ and Na+ deviating from the centroid of 18-crown-6 by 0.95 and 0.35 Å, respectively. Rb+ and Cs+ lie outside the 18-crown-6 ring and deviate from the centroid of 18-crown-6 by 0.05 and 1.35 Å, respectively. The formation of the 18-crown-6/alkali metal ion complexes is dominated by electrostatic attraction between the cations and the oxygen atoms (Oc) of 18-crown-6. Li+, Na+, K+, and Rb+ form the H2O···18-crown-6/cation···H2O “sandwich” hydrates, while water molecules only hydrate with Cs+ of the 18-crown-6/Cs+ complex on the same side of Cs+. Based on the local structure, the recognition sequence of 18-crown-6 for alkali metal ions in an aqueous solution follows K+ > Rb+ >Na+ >Li+, which is completely different from that (Li+ > Na+ > K+ > Rb+ > Cs+) in the gas phase, confirming that the solvation medium seriously affects the cation recognition of crown ethers. This work provides atomic insights into understanding the host–guest recognition and solvation behavior of crown ether/cation complexes.
研究领域:
化学
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物理化学
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产品关联
DOI
PubMed
高影响因子
Biochar
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2020
·Vol. 2
·期 1
·81-92
·
IF 0
Zhu Sihang,Qu Ting,Irshad Muhammad Kashif,Shang Jianying
A novel α-FeOOH modified wheat straw biochar (α-FeOOH@BC) was developed and the findings of the current study showed that α-FeOOH@BC is an efficient material for the simultaneous removal of cations (Cd(II)) and anions (As(III)) from aqueous solutions. The SEM, FTIR, and XRD analysis proved that α-FeOOH@BC was covered by α-FeOOH. In the single adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) were 62.9 and 78.3 mg/g, respectively. In the dual adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) dropped to 39.3 and 67.2 mg/g, respectively. The adsorption capacities of Cd(II) and As(III) by α-FeOOH@BC were much higher by BC and α-FeOOH both in single and dual adsorbate system. The adsorption results were well fitted by the Langmuir and pseudo-second-order kinetics models. The Cd(II) and As(III) co-adsorption on α-FeOOH@BC had a competitive effect, and the dominant adsorption mechanisms were co-precipitation and ion exchange. Our study showed that α-FeOOH@BC could be an effective remediation material for Cd(II) and As(III) co-adsorption from aqueous environment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Wenjun Zhou,Qiang Gao,Darui Liu,Chen Li,Shu Liu,Kaisheng Xia,Bo Han,Chenggang Zhou
A novel salicylaldehyde bis-Schiff-base probe decorated with imidazolium ionic liquid moieties at both ends (SAS-IMIs) was designed and facilely synthesized as a colorimetric/ratiometric sensor to visually detect Cu 2+ and Pd 2+ in pure aqueous media. Due to the positively charged characters of its head and tail, the SAS-IMIs exhibited high water solubility with a potential advantage in minimizing the self-aggregation. More importantly, simply by varying the solution pH, colorimetric/ratiometric sensing detection of individual metal ion (Cu 2+ or Pd 2+ ) was realized without any mutual interference. Subsequently, sensitive, selective, and differential detections for Cu 2+ (LOD: 0.080 μM) and Pd 2+ (LOD: 0.076 μM) in 100% aqueous solutions were achieved, which proved to be applicable for real water samples. Results from density functional theory (DFT) calculations unveiled the Cu 2+ /Pd 2+ -binding properties of SAS-IMIs, which were in accordance with the experimental observations. Furthermore, a SAS-IMIs-based solid phase sensor was fabricated, which manifested satisfactory detection abilities for Cu 2+ and Pd 2+ .
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2023
·
IF 3.8
Junli Shi,Mingya Wang,Xinqiang Pang,Yongzheng Liu,Wendong Liu,Yuanyuan Huo,Fanfan Shen,Shengling Li,Linxiu Zhao,Duanlin Cao
In this work, a highly sensitive fluorescent probe methyl (E)-2-((7-(diethylamino)-2-oxo-2 H -chromen-3-yl)methylene)hydrazine-1-carboxylate ( SJL ) was synthesized from 7-(diethylamino)-2-oxo-2 H -chromene-3-carbaldehyde and methyl hydrazinecarboxylate and characterized by various spectroscopic techniques. Highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies of SJL and SJL -Cu 2+ complexes were estimated by DFT calculations, thus elucidating the conformation of the complexes. The probe SJL formed a stable complex and displayed a remarkable fluorescence quenching response to Cu 2+ with a quenching efficiency of approximately 82.3% in aqueous solution. The binding stoichiometry of SJL -Cu 2+ was determined to be 1: 1 based on the Job's plot method, and it exhibited a good linear relationship at ultra-low concentrations with a detection limit of 0.6 μM. The optimum pH range for SJL was 5–9. SJL could be made into test strips for the characterization of Cu 2+ . In particular, the probe has been used to visualize copper ions in Hela cells and glassfish larvae.
研究领域:
化学
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生物学
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DOI
高影响因子
危险品化学品经营许可证（带存储）