ACS Applied Polymer Materials
·
2024
·
IF 4.4
Chunpeng Chai,Zhenqian Ma,Xuan Yin,Haosheng Pang
Self-healing polyurethane is a matrix material that can effectively extend the service life of composite materials. The layered two-dimensional Ti3C2Tx material has weak interlayer van der Waals forces, which can undergo slip and form transfer films during friction, reducing shear strength and improving the lubrication performance of the material. Therefore, we introduced two-dimensional Ti3C2Tx into a self-healing polyurethane matrix to improve the lubrication performance of the matrix material. A dual-ion self-healing polyurethane (SPU) was prepared using N-methyl diethanolamine, hexamethylene diisocyanate, and 1,3-propane sultone as raw materials. Ti3C2Tx was prepared by chemical etching, and NH2–Ti3C2Tx was obtained by chemically grafting amino groups onto the surface of Ti3C2Tx using amino-propyltriethoxysilane. Then, it was mixed into the SPU matrix to obtain the NH2–Ti3C2Tx/SPU composite material. Compared with pure SPU, the friction coefficient and wear rate of the system were reduced by 79.7% and 97.8%, respectively. Under 75%RH and 20 °C conditions, self-healing could be achieved rapidly within 5 min, with a self-healing efficiency of 84.4%. The kind of self-lubricating and self-healing polyurethane modified by amination-Ti3C2Tx is expected to be applied in automotive, electronics, and biomedicine.
研究领域:
材料科学
·
摩擦学
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纳米复合材料
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DOI
高影响因子
Nature Energy
·
2018
·Vol. 3
·期 12
·1067-1075
·
IF 46.859
Gao Wenbo,Guo Jianping,Wang Peikun,Wang Qianru,Chang Fei,Pei Qijun,Zhang Weijin,Liu Lin,Chen Ping
Ammonia is a promising carbon-free energy carrier, but is currently synthesized industrially under harsh conditions. Synthesizing ammonia using lower temperatures and pressures could therefore improve its prospects as a chemical means to store and transport energy. Here we report that alkali and alkaline earth metal imides function as nitrogen carriers that mediate ammonia production via a two-step chemical looping process operating under mild conditions. Nitrogen is first fixed through the reduction of N 2 by alkali or alkaline earth metal hydrides to form imides and, subsequently, the imides are hydrogenated to produce NH 3 and regenerate the metal hydrides. The oxidation state of hydrogen therefore switches between −1 (hydride), 0 (H 2 ) and +1 (imide and NH 3 ). Late 3d metals accelerate the reaction rates of both steps. The chemical loop mediated by BaNH and catalysed by Ni produces NH 3 at 100 °C and atmospheric pressure.
研究领域:
化学工程
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催化
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能源存储
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可持续化学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Xuyong Tang,Fengxi Li,Sijun Huang,Li Xu,Lei Wang,Yi Guo
Nicotinamide-adenine dinucleotide (NADH) as biomimetic units combined with copper ion to form laccases mimics (Cu-NADH). Cu-NADH has the enhanced activity of copper center to mediate aryl C–H amination using air as green oxidants. It could successfully catalyze oxidative coupling between different aromatic compounds and 4-phenylurazole (yield: 72 ∼ 91 %). Recycling catalytic ability (up to 6 times) showed its excellent stability. The Cu-NADH nanozyme was certificated to catalyze C–H amination effectively, and highlighted that it was a proper way to design catalysts according to enzyme-like catalyzing non-natural reaction.
研究领域:
生物化学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Xiaozhong Wang,Jiali Hu,Cai Xu,Yingqi Chen,Liyan Dai
Herein, a series of NiCu/Al 2 O 3 catalysts were prepared by impregnation method and subsequent thermal treatment under different reduction temperatures. The catalysts exhibited excellent catalytic activity for the amination of diethylene glycol (DEG), and satisfactory yield of tertiarybutylaminoethoxyethanol (TBEE) could be obtained. XRD, N 2 adsorption-desorption, SEM, TEM, XPS, and H 2 -TPR were employed to characterize the catalysts, the interaction between Ni and Cu on the catalytic activity was studied. It was found that NiCu alloy was formed after catalyst reduction, which strengthened the reduction ability of NiO and increased the number of Ni 0 active center, contributing to the enhanced catalytic activity. Moreover, the effects of reaction parameters on catalytic activity were explored. There was no need for a solvent, only 3 molar equivalents of tert‑butylamine (TBA) and 1 wt.% catalyst was required. After 7 h of reaction at 220 °C, satisfactory conversion (89.6%) and selectivity (84.6%) were obtained over the prepared catalyst. Cycle experiment demonstrated that the prepared catalyst retained excellent stability and reusability after six runs without significant loss of catalytic activity. This work provided an efficient catalyst for the catalytic amination of diethylene glycol with tert‑butylamine to TBEE.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Juan Liu,Jingping Zhong,Zhiwen Chen,Jinshui Mao,Jun Liu,Zhenyu Zhang,Xiaocheng Li,Sili Ren
Attapulgite (AT) nanorods are generally regarded as one-dimensional materials and have been widely used in many fields. Two-dimensional (2D) AT nanomaterials have remained quite rare due to the difficulty of assembling from one-dimensional nanorods. Herein, we have prepared a novel type of single-layered 2D palmate AT nanosheets (AT-NS) with uniform size by a solvothermal synthesis process. The morphology and structure of the obtained 2D nanosheets were characterized by SEM, TEM, AFM, XRD, FTIR, and XPS. It was found that the AT nanosheets have a mean thickness in the range of 30–50 nm, and the length and width are in the range of 30 nm-2 μm. The structure evolution from AT nanorods to nanosheets were systematically studied and revealed. It was shown that the amination of AT and the introduction of trivalent iron ions (Fe 3+ ) ions into the AT materials play key roles in the formation of AT-NS. The AT nanorods are connected each other by the AT-NH 2 groups coupling with the Fe 3+ ions on the AT surface. More importantly, the Fe 3+ substitute the Al 3+ , Mg 2+ in AT mainly along the (1 1 0) planes. Therefore, the coordination of trivalent iron ions with amino groups occurs on the AT (1 1 0) plane. As a result, multiple nanorods are connected side by side to form the 2D nanosheets in a palmate shape. It is believed that the special morphology and structure of the 2D AT-NS material may bring some outstanding performance, which makes it have potential important application such as the demulsification of crude oil-in-water emulsion. In addition, the confined 2D assembling methodology offers us a new way to design and prepare novel materials with 2D structure.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Meng Jiang,Lin Zhu,Zejun Zhang,Yijing Ai,Lina Zeng,Shuhai He,Lin Li,Wei Sun
In this article the ZIF-8 based metal-organic frameworks-derived porous carbon was mixed with aminated graphene to obtain the nanocomposite, which was used to modify the surface of glassy carbon electrode (GCE). SEM, XRD and FT-IR were used to characterize the nanocomposite, which exhibited the unique morphology with functional groups. The modified electrode was applied to the electrochemical detection of rutin. Compared with that of GCE, the current response of rutin increased obviously on the modified electrode. Square wave voltammetry was further applied to quantitative analysis of rutin with a linear relationship between the concentration and peak current in two sections from 0.25 to 0.7 μmol·L -1 and 0.7 to 1.5 μmol·L -1 with detection limit of 15 nmol∙L -1 . Consequently, the detection of real samples was realized by this method.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2014
·Vol. 15
·期 7
·1364-1368
·
IF 1.113
Chen Zaina,Feng Xiaoxiao,Han Danmin,Wang Liting,Cao Weipen,Shao Linjun
Porous polyacrylonitrile (PAN) fiber mat was prepared by electrospinning PAN in N,N -dimethylformide solution with poly(methyl methacrylate) (PMMA) as pore-forming agent. Then, the porous PAN fiber mat was chemical modified by the tetraethylenepentamine to acquire aminated porous polyacrylonitrile (APPAN) fiber mat. Common aminated PAN fiber mat was also prepared for comparison. The surface morphologies of the APPAN and PAN fiber mat were characterized by scanning electron microscopy (SEM) and the corresponding specific surface areas were also measured. FT-IR/ATR spectra of the APPAN and PAN fiber mat were recorded for analysis of the surface chemical structures. The Cr(VI) absorption results demonstrated that the porous structure in the fiber could obviously increase the absorption capacity of the fiber mat.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Chengsheng Ni,Wenxuan Lu,Jing Zhang,Luo Peng,Deti Xie,Jiupai Ni
This research studied the chemo-sensing of low-cost aminated pectin (PE) obtained by a facile calcination under ammonia gas at temperature no higher than 175 °C without excessive use of alkaline, acid or solvents. The ammonia gas was found to replace the hydroxyl and methoxyl group, enhancing the crystallinity and solubility of the resultant pectin than those calcined in air or in 5% H 2 . Though the increase of light absorption could be attributed mainly to the dehydration during calcination which caused the formation of C C double bond or aromatic ring, the N incorporation could be important to the photoluminescence (PL) emission. The PL quenching of the blue fluorescent aminated pectin showed a good linearity with the concentration of Cu 2+ , Fe 3+ and the highest sensitivity toward Cu 2+ among the investigated metal ions. In order to further increase the PL quenching toward Cu 2+ and decrease the interference of Fe 3+ , a method involving H 2 O 2 and ultraviolet illumination was developed to catalyze the oxidation of fluorophores on the polymer. This work provides new horizon on the modification and application of pectin in chemosensing.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2020
·
IF 2.463
Zhang Yi,Li Huajie,Li Mingchun,Xin Meihua
On the basis of aminated chitosan, graphene oxide was blended to prepare ACS/GO composite material. The composite material was characterized by SEM and X-ray diffraction, and applied to the adsorption of aniline from aqueous solution and cigarette smoke. The results showed that when ACS/GO composite material was prepared, graphene oxide was more dispersed and no agglomeration occurred, the surface area of ACS/GO was 7.460 m 2 /g. The adsorption of aniline by ACS/GO could meet both the Freundlich adsorption model and the Langmuir adsorption model in water. Meanwhile, the kinetics data of the adsorption of aniline by ACS/GO was fit better into the pseudo-second-order equation. The addition of GO could help to improve the adsorption performance of ACS on aniline in cigarette smoke.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Pharmaceutics
·
2019
·Vol. 11
·期 11
·584
·
IF 4.773
Xiaoxiao Sun,Dongyan Yu,Zhuoyang Ying,Chuqiao Pan,Nan Wang,Fangfang Huang,Junhong Ling,Xiao-kun Ouyang
Curcumin (Cur) has anticancer activities but has poor stability, which can be improved using carrier materials. In this study, chitosan was aminated to increase the number of amino groups on its surface, modified with folic acid (FA), and then made into nanoparticles by ionic crosslinking. Owing to ion interaction, the negatively charged, non-toxic tripolyphosphate (TPP) interacted with the positively charged amino group on the aminated chitosan (AmCS) surface, producing FA-AmCS-TPP nanoparticles, which were then characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectrophotometry (FT-IR), and thermogravimetric analysis (TGA). Their small particle size (175.2 ± 0.99 nm) and good surface positive potential (+42.4 mV) are beneficial for carrying antitumor drugs. We subsequently investigated whether coating of Cur by AmCS allows slow drug release by FA-AmCS-TPP nanoparticles in different pH environments, and estimated the Cur loading efficiency (EE-Cur). Our results showed that the cumulative release rate of Cur at 48 h was 56.2%, and that the EE-Cur reached 94.26 ± 0.91% with nanoparticles composed of 0.10 g AmCS, 10.0 mg FA, 10.0 mg TPP, and 15.0 mg Cur. Additionally, cytotoxicity experiments showed that the Cur/FA-AmCS-TPP nanoparticles had good targeting ability for tumor cells. Therefore, the non-toxic targeted composite nanoparticles had potential as a new antitumor agent that can overcome the limitations of Cur.Keywords:aminated chitosan;folic acid;nanoparticles;targeted delivery;curcumin
研究领域:
生物材料学
·
药剂学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Rui Zhang,Xiao Luo,Qi Yang,Fan Cao,Shupanxiang Chen,Zhiwu Liang
This work has investigated CO2 absorption using 3-(diethylamino)propylamine (DEAPA), a diamine that contains one primary and one tertiary amine in the same molecule. The results are compared with those for the blended amine system of monoethanolamine and methyldiethanolamine (MEA–MDEA), a mixed amine solvent with an equal number of moles of primary and tertiary amine. The 2 M DEAPA, 2 M MEA, and 4 M MEA–MDEA (1:1 mole ratio) were tested for their CO2 absorption performance. The experimental results show that the intramolecular tertiary amino group of DEAPA can promote the CO2 absorption rate of the intramolecular primary amino group and enhance its CO2 absorption capacity. The results using 13C nuclear magnetic resonance also showed that the intermolecular tertiary amine in the MEA–MDEA system was more favored for the promotion of the primary amine in the blend to form bicarbonate at an earlier CO2 equivalent loading stage and produced less carbamate than the intramolecular tertiary amino group of DEAPA did with respect to its primary amine. Furthermore, the CO2 equilibrium solubility of DEAPA was measured at different temperatures with various CO2 partial pressures, and then an empirical model based on these experimental data was developed. The results predicted by this model were fitted well with the experimental results. The Gibbs–Helmholtz equation was used to estimate the CO2 absorption heat of the DEAPA system, and the results showed that DEAPA has a CO2 absorption heat (−36.4 kJ/mol) lower than those of MEA, MDEA, and DEA. The results demonstrate that DEAPA has the potential to be an alternative solvent with a high absorption rate, a high CO2 capacity, and a low heat of absorption in CO2 capture processes.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Linghui Wang,Yu Cai,Yihang Jing,Baoku Zhu,Liping Zhu,Youyi Xu
Polyethersulfone (PES) membranes with improved hemocompatibility were prepared via solid–liquid interface aminolysis and heparinization. Reactive amino groups were generated by immersing solid PES membranes in proper diamine solution. Heparin was covalent immobilized on the surface via amide bond. The feasibility of surface aminolysis for the introduction of amino groups and the effectiveness for further heparin immobilization were confirmed by surface group analysis. The effect of aminolysis time on surface amino group concentration and bulk mechanical properties was investigated. The surface amino group concentration determined the amount and bioactivity of immobilized heparin chains. SEM images suggested that both the aminolysis and heparinization reaction had little effect on the surface morphology of PES membranes. Contact angle measurement, surface charge analysis, protein and platelet adsorption/adhesion experiment were applied to study the surface properties. The results showed that the heparinized PES membranes displayed enhanced hydrophilicity and hemocompatibility, indicating potential application in blood purification and other blood contacting fields.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）