CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 6
·1039-1044
·
IF 1.063
Gu Xianmo,Ma Pengwei,Liu Pei,Wang Ruiyi,Li Xincheng,Zheng Zhanfeng
A new type of activated carbon immobilized copper(Cu/AC) photocatalyst was prepared by a facile impregnation-adsorption method, where Cu 2+ is chemically adsorbed by abundant oxygenated functional groups on large-surface-area activated carbon surface. Cu/AC exhibited good activity and selectivity to imine for the hydroamination of alkynes at 60 °C under visible light irradiation. The reaction is initialized by the activation of alkynes molecules at Cu active sites with the aid of light as evidenced by the solid-state NMR and laser photolysis measurements and the control experiments. This strategy for catalyst design is potentially extended to the immobilization of other metal homogeneous catalysts for various heterogeneous catalytic systems.
研究领域:
催化化学
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材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2021
·Vol. 58
·期 5
·342-352
·
IF 1.049
Haiyan Gao,Yue Zhou,Jianguo Wang,Hujun Xu
A temperature-sensitive hair dye was prepared with a poloxamer-sodium alginate mixture. When the hair dye was applied to the hair (< 32 °C), it retained its flow dynamics. The hair dye was able to undergo a phase change and formed a solid as soon as it touched the scalp (32°C), which reduced the transdermal amount of p -phenylenediamine (PPD) and also adverse effects and toxicity. Compared to a conventional hair dye, the temperature-sensitive hair dye achieved a reduction of the transdermal amount of p -phenylenediamine by almost 65% at different concentrations. At the same time, the colouring effect was not significantly reduced. The poloxamer alginate hydrogel can be used as a novel colouring material to reduce the harm of the dye intermediate to the human body when colouring hair.
研究领域:
化妆品科学
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毒理学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 16
·
IF 1.866
Jia Ming Zhu,Ge Li,Lan Ying Jiang
A series of polysiloxaneimide (PSI)/polyetherimide (PEI) composite hollow fibers were fabricated by coextrusion and phase inversion. The hydrophobic PSI outer layer was set as the selective layer which was supported by the PEI inner layer. The PSI was synthesized by polycondensation of 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride (BPDA) with amino siloxane X-22-161A and a chain extender, 1,3-Bis (3-aminopropyl) −1,1,3,3-tertramethyldisiloxane (BATS). It was found that the macroscopic uniformity of PSI layer was dependent on the dope formulation, coagulant composition and dope flow rate: (1) the higher similarity degree of the solvent(s) for different layers in terms of solubility parameters, (2) the utilization of surfactant as a component in the water coagulant, and (3) higher flow rates of the outer layer dopes, led to the formation of more uniform and smoother PSI outer layer. The maximum outer layer thickness was around 2 μm. The bulk of the PEI layers were porous with finger like macrovoids. The outer surface of the inner PEI layer for some batches of the hollow fibers was confirmed to be porous. The original dual-layer hollow fibers showed poor pervaporation performance. Post treatment was applied to cure the hollow fiber, delivering composite membranes with performance dominated by the coating material of PDMS. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43324.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 11
·797
·
IF 3.8
Hanyang Zhang,Wen Liu,Jiale Hu,Qian Zhang,Zeguo Fang,Dong Li
An efficient method involving copper-catalyzed trifluoromethylthiolation and radical cyclization ofN-phenylpent-4-enamides using readily available and stable AgSCF3as the trifluoromethylthiolating reagent is described. The method enables the synthesis of a series of potential medicinally valuable trifluoromethylthio-substitutedγ-lactams and relative 2-oxazolidinone derivatives with broad functional group compatibility. Mechanistic investigations indicated that this reaction involved amidyl radical-initiated cascade5-exo-trigcyclization followed by trifluoromethylthiolation, resulting in the formation of new C-N and C-S bonds.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2023
·Vol. 65
·期 4
·358-368
·
IF 1
Tiantian Ren,Xu Yuanyuan,Wu Jianning,Meng Guihua,Yang Shengchao,Cui Lin,Liu Zhiyong,Guo Xuhong
Abstract Collecting water from the air could alleviate freshwater shortages in arid regions such as remote and inland areas. However, it is challenging to prepare adsorption materials that have high adsorption and desorption performance using straightforward synthesis routes for water harvesting applications. In this paper, a polydopamine (PDA)@Sodium polyacrylamide carboxymethyl cellulose (PAM-CMCNa)-calcium chloride (CaCl 2 ) composite aerogel (PDCA) with a vertical channel was prepared by salt template method and photopolymerization for atmospheric water collection (AWH). The designed vertical channel promotes the rapid transport of water molecules from the atmosphere to the interior of the hydrogel through capillary action. During this process, the hydrogel further expands to prevent the leakage of the internal salt solution, which effectively improves the water vapor adsorption and desorption by hydrogel. Experimental results showed that the hydrogel can absorb 2.78 g/g of water at 90% relative humidity (RH), where 56.3% of the captured water can be desorbed within 60 min of exposure under 1.0 sun light intensity. After 10 adsorption-desorption cycles, the PDCA still possesses excellent water sorption performance. The indoor water collection test showed that the water collection performance reached 2.143 kg/kg day at 90% RH and 25°C adsorption for 12 h and desorption for 6 h. The proposed method for the preparation of PDCA composites can achieve high water harvesting performance over a wide humidity range to enable solar-driven clean water production in remote areas.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10388-10398
·
IF 3.553
Zhong Mingjun,Zhang Shizhen,Dong Anwang,Sui Zhuyin,Feng Lijuan,Chen Qi
Heterogeneous metal–organic framework composites are widely used to catalyze the synthesis reaction of organic materials. Here, we report the use of a heterogeneous catalyst to catalyze the reaction of alcohols and amines to synthesize imines directly using a one-pot method. A low-dimensional Cu-MOF prepared by a simple surfactant-assisted method shows the morphology of nanorods. Cu-MOF nanorods provide an ideal support for preparing supported metal nanocatalysts. A reduction method was applied to immobilize the ultrafine noble metal Au and Pd nanoparticles on the surface of Cu-MOF nanorods to form a Cu-MOF/Au–Pd composite catalyst. Cu-MOF/Au–Pd catalyst is used to catalyze the reaction between alcohols and amines to form imines. Due to the synergy between different metal nanoparticles, it can effectively catalyze the reaction to form imines. In addition, Cu 2+ in Cu-MOF/Au–Pd catalyst facilitates the adsorption of substances by excess electrons and promotes product formation. After 12 h of catalytic reaction, the yield of imine is as high as 95%.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Shenyi Jiang,Shuang Li,Pingbo Zhang,Hongyan Miao,Pingping Jiang,Yan Leng
Melamine sponge (MS) with open three-dimensional porous structure is regarded to be an ideal substrate to prepare monolithic adsorbents for heavy metal ions removal. However, most of the existing surface modification strategies of MS are still difficult to achieve a satisfactory adsorption ability for Pb(II). In this study, tannic acid (TA) and polyethyleneimine (PEI) were alternatively deposited on the framework of MS via layer-by-layer covalent assembly between polyphenols of TA and amine groups of PEI. The morphology, molecular structure, and overall properties of the obtained multilayer-decorated MS materials (PEI-TA) n -MS were characterized using SEM, XPS, FT-IR, and TGA . (PEI-TA) 2 -MS was demonstrated to be extremely stable and exhibited excellent adsorption behavior for Pb(II). The maximum Pb(II) adsorption capacity reached 257.4 mg/g at pH value of 5.0 and initial Pb(II) concentration of 200 mg/L. It is better than those of previous reported PEI-based adsorbents under similar conditions. The kinetic and isotherm data revealed that such process is exothermic, and well fits the Langmuir isotherm and the pseudo-second-order kinetic models. The present PEI-TA-based layer-by-layer assembly strategy may offer new prospects for the versatile design of other monolithic adsorbent materials.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2019
·Vol. 230
·期 2
·41
·
IF 1.774
Wang Wanfeng,Liang Fang,Guo Yanling,Wu Ruijie,Pan Feng,Jin Caixia,Wang Jun
Since nitrosamine disinfection by products is highly carcinogenic, they have attracted considerable attention due to their increased presence in ambient waterways and potable water supplies. For the present study, the potential formation of nitrosamines from corresponding precursor secondary amines during ozonation was investigated. The results revealed that five nitrosamines were observed during the ozonation of their corresponding secondary amines. The molar yields initially increased and then decreased with longer contact times and higher ozone doses. These phenomena indicated that ozone not only promoted nitrosamine formation but also degraded the formed nitrosamines. High pH had a positive influence on nitrosamine formation at room temperature. Further, coexisting substances including nitrate, nitrite, humic acid, and tert-butanol inhibited the generation of nitrosamines due to hydroxyl radical (·OH) competition and scavengers, whereas in the presence of hydroxylamine, nitrosamine formation increased considerably without ozone due to its capacity for independent formation between secondary amines and hydroxylamine. Further, the generation of nitrosamines from secondary amines was primarily attributed to O 3 and ·OH oxidation, which was produced through the decomposition of ozone. The transformation pathways were mainly comprised of the indirect routes between the O 3 /·OH intermediates. The findings of this study were helpful toward expanding the knowledge of nitrosamine formation during the corresponding precursor secondary amine ozonation process.
研究领域:
环境科学
·
水处理化学
·
污染物转化
·
消毒副产物
·
氧化过程
✓ 已验证
DOI
高影响因子
POLYMER
·
2011
·
IF 3.829
Lu Xu,Junjun Li,Daoliang Wang,Youju Huang,Mingming Chen,Liangbin Li,Guoqiang Pan
A series of rod-coil-rod triblock copolymers containing polycaprolactam (PA6) as the coil block and poly ( p -benzamide) (PBA) as the rod block were synthesized by a two-step polycondensation reaction. Proton nuclear magnetic resonance ( 1 H NMR), UV–vis spectrophotometry (UVS) and differential scanning calorimetry (DSC) were performed to determine the fundamental molecular structure and thermal property of copolymers . UV–vis spectrophotometry results revealed that the content of PBA homopolymer increased with the block length (number of monomer) of PBA and reached a plateau value ranging from 22 to 40 monomers of PBA. The wide angle X-ray diffraction (WAXD) measurements indicated that the crystallization of PA6 blocks was strongly suppressed due to the stretching from rods after annealed at temperature above the melting point of PA6. Only a few imperfect crystals of PA6 existed in the samples with low volume fraction of PBA. Moreover, the variation of PA6 block length hardly affected the crystallinity of PBA, which was dominantly controlled by the block length of PBA as diffusion was the control step for PBA crystallization at the annealing temperature.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yucong Ji,Lumeng Liang,Teng Ma,Jinning Hu,Ziyi Chen,Jun Chen
Inorganic perovskites have attracted much attention due to their excellent optical properties , making them a potential material for optoelectronic devices . In order to better apply it to optoelectronic devices, researchers have developed many synthesis schemes, for example, hot injection method, ligand-assisted reprecipitation method, template method, etc. to accurately control chemical composition, dimension, size, photoelectric and other properties. Here, we used oleylamine, octylamine, and phenylethylamine as amine ligands, and synthesized quantum dots (QDs) through the hot injection method. We found that quantum dot solutions prepared with long-chain ligands exhibit better luminescence performance, while quantum dot films prepared with shorter-chain phenethylamine ligands exhibit better luminescence performance, revealing the regulatory mechanism of amine ligands in the quantum dot growth process. In addition, we have enhanced the optical properties of perovskite films through laser direct writing , providing a reference for the synthesis and control of perovskite materials and their applications in the display.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Bowen Zheng,Jing Li,Ning Li,Wa Li,Shuai Zhang,Haile Lei
The preparation of soluble photosensitive polyimides maintaining high mechanical properties is a challenge. By synthesizing cross-linked interpenetrating polymer networks (IPNs) composed of polyacrylate and polyimide, soluble photosensitive polyimides with high mechanical properties were successfully developed. Isophorone diamine (IPDA) was introduced as a bulky group into the polymer backbone, significantly improving the solubility of PAE. PAE demonstrated a solubility of 55 wt% in N,N-dimethylformamide (DMF). Following photopolymerization, PAE was subjected to thermal treatment, leading to the formation of IPNs composed of polyimide and polyacrylate. This process enhanced the mechanical properties, yielding a tensile strength of 122.73 MPa, a breaking elongation of 4.76%, a Young’s modulus of 5.5 GPa, and a hardness of 0.51 GPa.
研究领域:
材料科学
·
高分子化学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 5
·050548
·
IF 4.316
Chengjun Zhang,Sha Chen,Guangying Zhou,Qiong Hou,Suilian Luo,Yuhai Wang,Guang Shi
Two poly(arylamine-imide)s, poly(N,N,N',N'-tetraphenyl-1,4-benzenediamine naphthalenediimide) (PDDP-NI) and poly(N,N,N',N'-tetraphenyl-1,4-benzenediamine perylenediimide) (PDDP-PI), were successfully prepared by condensation polymerization of an amine monomer N,N,N',N'-tetraphenyl-1,4-benzenediamine (DDP) with dianhydride monomer 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) or 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA). The DDP units in the polymer can reversibly dope/dedope the PF6− anion, while the naphthalenediimide (NI) unit or perylene diimide (PI) unit can reversibly insert/extract the lithium cation. The lithium ion half-cells based on the polymer cathode and the lithium anode are assembled and the electrochemical properties are tested. Due to the high voltage of the DDP unit in the polymer backbone, lithium-ion half-cells based on PDDP-NI and PDDP-PI cathodes provide a high average discharge voltage of about 3.2 V. Moreover, the as-prepared polymer materials exhibit long-cycle performance, PDDP-NI remains 89% capacity after 500 cycles at 10 C and PDDP-PI maintains 98% capacity after 1000 cycles at 10 C, furthermore, their coulombic efficiency close to 100% at all current rates tested, which shows that these organic cathode materials have potential applications in long-cycle lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）