JOURNAL OF RARE EARTHS
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2020
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IF 3.104
Xiaoru Zhao,Xinyu Jiang,Dongming Peng,Jie Teng,Jingang Yu
Three-dimensional (3D) graphene oxide-tris(4-aminophenyl)amine (GO-TAPA x:y ) composites with different GO-to-TAPA mass ratios ( x : y ) were prepared by a facile one-step ultrasonic treatment. GO-TAPA x : y composites were characterized by scanning electron microscopy (SEM), nitrogen (N 2 ) adsorption-desorption isotherms, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). Behavior and mechanism of GO-TAPA x:y composites for the adsorption of rare earth elements (REEs) were investigated. The adsorption capacities of GO-TAPA 1:2 composite for Yb 3+ , Er 3+ , Nd 3+ , La 3+ and Y 3+ are 30.88, 26.52, 20.60, 11.24 and 10.52 mg/g, respectively. Effects of some important parameters including GO-to-TAPA mass ratios, contact time, reaction temperature and initial Yb 3+ concentration on the adsorption were evaluated in detail. FTIR spectral and XPS analyses show that the metal complexations and ion exchanges between nitrogen/oxygen-containing species of the adsorbents and REEs are involved in the adsorption procedure besides the conventional adsorption based on specific surface area, indicating the introduction of specific molecules onto GO is beneficial to its adsorption ability. The convenient reusability and applicability of GO-TAPA x : y composites toward real samples also demonstrate their feasibility in the enrichment of REE ions.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Shuming Chen,Jintao Wang,Zhenyu Wang,Ziqiang Chen,Kai Fang,Chenyang He,Ning Jiang,Jian Zhang,Ye Li,Chuannan Li,Peng Li,Wenlong Jiang,Yu Duan
The energy level alignment and conductivity of hole transport layers (HTLs) are critical to the performance of perovskite solar cells (PSCs). Additive engineering is an effective approach, and we introduced tri(4-trifluoromethylphenyl)phosphine (343FP) as an additive into poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA). Studies have shown that the addition of 343FP can lead to improved charge transport properties in the PTAA and can also enhance charge transport, leading to improved device efficiency of the resulting perovskite solar cell. 343FP reduces the highest occupied molecular orbital energy level of PTAA, improves the conductivity of HTLs, and passivates the interface defects, and the optimized device of 343FP shows a champion efficiency of 20.02%. In addition, due to the hydrophobicity of 343FP, compared with the traditional hygroscopic dopant lithium bis((trifluoromethyl)sulfonyl)azide (Li-TFSI)/4-tert-butylphenol (t-BP) bi-doped (Li-doped) PTAA and the undoped PTAA, the device with 343FP-doped PTAA has better environmental stability. After 1000 h of exposure to the environment, the efficiency of 78% of the original value can be maintained. This work will open up a new method for the optimization of high-efficiency and high-stability perovskite photovoltaic hole transport layers.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
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IF 4.504
Xiaojing Lv,Shuanma Yan,Yuyu Dai,Mi Ouyang,Yuan Yang,Pengfei Yu,Cheng Zhang
Ionic liquids 1-butyl-3-methyl-imidazolium tetrafluoroborate ([BMIM]BF 4 ), 1-butyl-3-methylimidazoliumhexafluorophosphate ([BMIM]PF 6 ) and conventional medium tetrabutylammonium perchlorate (TBAP) were utilized as electrolyte for the preparation of poly(4,4′,4′'-tris[4-(2-bithienyl)phenyl]amine) (PTBTPA) films and assembling of EC devices. FTIR spectra and EDX pattern demonstrate an effective doping of the anion into the PTBTPA film at the oxidation state. SEM images investigate the thickness of the polymer films and the morphologies of crimped structure at the oxidation state. The ion diffusion distance (the thickness of polymer film) plays a more critical role for the EC switching speed. According to the electrochemical impedance spectra, the improved ionic conductivity with ionic liquid [BMIM]BF 4 as the electrolyte promote ions more easily dope into the polymer film which leads to the higher optical contrast. In addition, the size of doping anion during the redox process has essential influence on the electrochemical stability.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
DESIGNED MONOMERS AND POLYMERS
·
2016
·
IF 1.497
Yangyang Wang,Liqiang Wan,Dongjing Han,Lvyuan Ye,Farong Huang
2,4,6-Tri(4-propargyloxy-phenyl)pyridine(POPP) was made from 2,4,6-tri (4-hydroxyphenyl)pyridine(HPP) and propargyl bromide. The chemical structures of POPP and HPP were well characterized by means of FTIR, 1H-NMR, 13C-NMR, and elemental analysis. Novel polytriazole resins (P-PTA resins) were prepared from POPP and azide compounds via 1, 3-dipolar cycloaddition reaction and characterized by solubility, FTIR, DSC, and TGA analyses. The P-PTA resins show good solubility in common solvents. The resins could be cured at 80 °C. The glass transition temperature (Tg) and the 5% weight loss temperature (Td5) of the cured P-PTA-33 resin arrive at 310 and 365 °C in nitrogen atmosphere, respectively.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Xiaohuan Li,Tongjia Zhang,Shoutian Qiu,Xingdi Zhang,Jiyong Zhao,Donghan Li,Honghua Wang
The incorporation of linear thermoplastic resin is commonly utilized to improve the toughness of the epoxy system. However, practical application often encounters issues, such as poor compatibility, noticeable phase separation, and limited toughening effect. Branched-chain polymer, characterized by a branched structure, numerous voids, and a higher number of active end groups compared with its linear counterpart, has more advantages as a toughening agent. In this study, trifunctional monomer 1,1,1-tri (4-hydroxyphenyl) ethane (THPE) was introduced into the molecular chain of linear phenolphthalein polyaryl ether sulfone (PESC) to form a branched structure in the resulting polymer. By adjustment of the proportion of THPE, long-chain branched PESCs (LCBPESCs) with varying degrees of branching were successfully synthesized and characterized for their molecular structure, molecular weight, and thermal properties. To evaluate the toughening effect, properties of the epoxy resin/methyl tetrahydrophthalic anhydride system mixed with LCBPESCs of different masses after curing were investigated. Results demonstrated that after curing, significant improvement in phase separation and toughness of LCBPESC-toughened epoxy resin occurred, and the corresponding toughening mechanism. Specifically, when LCBPESC-30 with 5 phr was added, the impact strength of the epoxy system increased by 68%, leading to a substantial enhancement.
研究领域:
材料科学
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高分子化学
·
复合材料
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 12
·5035-5043
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IF 1.6
Li Lin,Qian Zhenghua,Zhang Hengrui,Duan Xilei,Liu Xueyang,Zhang Qiang,Qiao Yanbo
The porous compound generated from the reaction of 4-[tris(4-carboxyphenyl)methyl]benzoic acid (H4MTB) with actinide Th in simulated high-level radioactive waste can adsorb Ru, which can separate Th and Ru by more than 68.1 and 37.3%, respectively, in simulated high-level radioactive waste. The waste liquid before and after separation was vitrified with borosilicate glass and iron phosphate glass. The composition and morphology of the glasses were characterized by XRD, SEM and ICP‒OES, and the product consistency test was used to measure the chemical durability of the glasses. The chemical stability and waste loading of the glasses after the separation of actinide and noble metal elements was significantly improved. This work is of great significance for the recovery and utilization of actinide and noble metal elements in high-level radioactive waste and the optimization of the vitrification process of radioactive waste.
研究领域:
核化学
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放射性废物管理
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 15
·2108055
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IF 15.153
Wen-Zhen Li,Hao Chen,Meng-Na Shen,Ziqiong Yang,Zhengyu Fan,Ju Xiao,Junling Chen,Haibo Zhang,Zhengxi Wang,Xiao-Qiang Wang
Radical-containing frameworks (RCFs) have emerged as promising functional materials in various fields due to the combination of the highly ordered frame structure and the fascinating property of organic radicals. Here, the first example of radical-containing supramolecular organic frameworks (SOFs) fabricated by the chaotropic effect between closo -dodecaborate cluster (B 12 H 12 2− ) and 2,4,6-tri(4-pyridyl)-1,3,5-triazine (TPT 3+ ) is presented. The SOFs can be easily synthesized by stirring the B 12 H 12 2− and the TPT 3+ in aqueous solution through self-assembly. Upon 435 nm light irradiation, the SOFs exhibits photochromic behavior from slight yellow ( SOF-1 ) to dark purple ( SOF-2 ). Electron paramagnetic resonance spectroscopy also reveals that stable radicals are generated in situ after light irradiation. Powder X-ray diffraction demonstrates the SOFs maintain their structural stabilities upon light irradiation. More interestingly, the radical-containing SOFs exhibit efficient photothermal effect under 660 nm light irradiation, which can be applied as photothermal agent for antibacterial application both in vitro and in vivo. This work highlights the construction of RCFs through supramolecular self-assembly, which may arouse applications in energy, catalysis, photoluminescence, and biomedical fields.
研究领域:
材料科学
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光热治疗
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超分子化学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Zhentao Li,Zhengzheng Liao,Xiaoru Ding,Jinfang Hu,Zilin Chen
Herein, a spherical covalent organic framework COF TAPB-DMTP was facilely synthesized from 2,5-dimethoxyterephthalaldehyde (DMTP) and 1,3,5-tri-(4-aminophenyl)benzene (TAPB) as monomers. COF TAPB-DMTP with regular mesoporous and excellent mass transfer ability was first introduced into the capillary and immobilized on the inner wall of the capillary through a simple in situ growth method. Through various characterization results, COF TAPB-DMTP was successfully prepared and modified onto the capillary inner wall. The separation performance and potential of COF TAPB-DMTP modified capillary column was explored. The new developed COF modified column achieved a highly efficiency and selective separation between analytes with different properties, including halogeno benzenes, alkylbenzenes, phenols and sulfonamides. Satisfactory stability and reproducibility were observed on COF TAPB-DMTP modified columns. The intraday, interday and three batch columns relative standard deviations were all less than 1.85 % for the retention time. The separation performance of prepared column has no significant change after 90 continuous runs. Additionally, the COF TAPB-DMTP modified capillary column was successfully used for separation and detection of triazole antifungal drugs in human plasma, and the recoveries of three antifungal drugs (fluconazole, isavuconazole and posaconazole) in spiked samples were in the range of 98.6–100.8 %, 92.4–102.1 % and 99.9–107.5 %, respectively. This self-made column showed excellent application potential in chromatography separation science.
研究领域:
分析化学
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材料科学
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药物分析
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiaohong Liu,Libo Li,Fang Li,Wanlin Zhao,Lijun Luo,Xiaoya Bi,Xia Li,Tianyan You
Signal amplification provides an effective way to improve detection performance. Herein, an ultrasensitive electrochemiluminescence (ECL) aptasensor for Pb 2+ detection was developed based on a dual signal-amplification strategy of the abscission of a quencher and the generation of a G-quadruplex by one-step and simultaneous way. Nitrogen-doped carbon quantum dots linked with complementary DNA (cDNA-NCQDs) at the sensing interface was applied as the quencher of a tris(4,4′-dicarboxylic acid-2,2′-bipyridyl)ruthenium(II) (Ru(dcbpy) 3 2+ )/tripropylamine system to minimize the ECL signal due to the intermolecular hydrogen bond-induced energy-transfer process. Upon the addition of Pb 2+ , its specific binding with the aptamer triggered the abscission of cDNA-NCQDs, accompanied by the formation of G-quadruplex on the surface of the electrode, both of which amplified the intensity of the light emission. The ECL amplification efficiency induced by the above two mechanisms (78.6%) was valuably greater than that of their sum value (69.3%). This synergistic effect resulted in high detection sensitivity of the ECL aptasensor, which allowed to thereby obtain Pb 2+ measurements in the range of 1 fM - 10 nM with an ultra-low detection limit of 0.19 fM. The Pb 2+ -mediated synergistic signal-amplification ECL strategy can provide a new approach for integrating various amplification strategies.
研究领域:
分析化学
·
环境科学
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材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）