JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Tianqi Chen,Mengjin Chen,Zhan Chen,Chaoyang Fu
Polymeric corrosion inhibitors have superiorities compared with small organic molecules, such as containing multiple adsorption sites and being easier to form multilayer films on metal surface. Polyethyleneimine (PEI) with polar group and hydrophobic group is a kind of water-soluble polymer which is prone to be modified and used as corrosion inhibitor in neutral medium, and polyethyleneimine phosphorous acid (PEPA) was synthesized by facile method. The anti-corrosion performance of PEPA for mild steel in neutral medium was evaluated by weight-loss tests, electrochemical measurements concerning Tafel polarization plots and electrochemical impendence spectroscopy (EIS), surface morphology analysis and theoretical calculation. Results of gravimetric and electrochemical tests indicate that PEPA as polymeric corrosion inhibitor present excellent inhibition efficiency in neutral corrosive medium, The adsorption model of PEPA conformed to Langmuir adsorption isotherm involving both physisorption and chemisorption, and morphology observations manifest the extent of corrosion of mild steel with the addition of PEPA is obviously reduced. Theoretical calculations including quantum chemical calculation and molecular dynamics simulation (MD) further reveal the adsorption mechanism of inhibitor PEAP at molecular or atomic level.
研究领域:
材料科学
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电化学
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理论计算
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DOI
高影响因子
Journal of Materials Chemistry A
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2018
·Vol. 6
·期 7
·3231-3241
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IF 9.931
Fan-Ning Meng,Meng-Qian Zhang,Kai Ding,Ting Zhang,Yong-Kuan Gong
The fabrication of stable and highly antifouling membranes for the separation of various oil/water mixtures remains challenging. A facile and universal coating strategy is developed to modify the chemically inert PVDF separation membrane. The membrane is first coated with a nanolayer of mussel-inspired polydopamine (PDA) from dopamine solution to provide a reactive amino surface. The universally and strongly adhered PDA mediation layer (PVDF/PDA) is then covalently anchored with a mono-layer of a cell outer membrane mimetic and reactive random copolymer (PMEN) to confer excellent antifouling nature. The PMEN coated PVDF membrane (PVDF/PDA/PMEN) demonstrates better superhydrophilicity by changing the water contact angle to 0° in 5 s and stronger underwater superoleophobicity with an oil contact angle of ∼170°. More excitingly, the sliding angle of the underwater oil droplet on the membrane is as low as 0.5°. Furthermore, the PMEN coated membrane shows great advantages over other modifications by way of enhanced separation and excellent antifouling performances for both oil-in-water emulsions and adhesive high concentration crude oil/water mixtures. This facile and universal coating strategy for the fabrication of a stable and cell-membrane-mimetic antifouling membrane has great potential in efficient oil/water separation, even in the separation of adhering crude oil/water mixtures.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2013
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IF 2.108
Jing Xiong,Xue-dong Wu,Qun-ji Xue
Monodisperse Ag nanoparticles (Ag NPs) (1–2 nm in diameter) was synthesized using a straightforward one-step method. Poly-amino compounds (DETA, TETA and PEPA) with two or more primary amino groups NH 2 , which containing N donor atoms, were utilized as effective stabilizing agent to prevent the aggregation of Ag NPs in nonaqueous medium. The successful formation of poly-amino compounds stabilized Ag NPs was demonstrated by ultraviolet–visible spectroscopy (UV–vis), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FRIR). The mechanism of poly-amino compounds on the stabilization of Ag NPs is also discussed. This facile one-step synthesis route may provide a new perspective for creating other nanoparticles that have potential application in various nanotechnology fields.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
Nanomaterials
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2022
·Vol. 12
·期 3
·477
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IF 5.719
Xiaofei Yan,Jie Fang,Jianjun Gu,Chenkai Zhu,Dongming Qi
Poly(vinylphosphonic acid) (PVPA) and polyethylenepolyamine (PEPA) are used as novel intumescent flame retardants to improve the properties of MXene (2D Ti3C2Tx)/poly(vinyl alcohol) (PVA) nanocomposites. We investigated the flame-retardant properties, thermal stability, and mechanical properties of MXene/PVA nanocomposites. The results show that MXene was homogeneously dispersed in the PVA matrix containing PVPA and PEPA. PVPA and PEPA effectively improved the flame-retardant properties of MXene/PVA nanocomposites and they did not obviously change the thermal degradation of the MXene/PVA nanocomposites. Moreover, MXene improved the thermal stability of the PVA matrix. The elongation at break of MXene/PVA nanocomposites reached its maximum when the MXene mass fraction was 1.0 wt.%, regardless of whether PVPA and PEPA were present in the PVA matrix, whereas the tensile strength and Young’s modulus of MXene/PVA nanocomposites increased with the increase in MXene content in the PVA matrix.Keywords:flame-retardant properties;MXene/PVA nanocomposites;poly(vinylphosphonic acid);polyethylenepolyamine
研究领域:
材料科学
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化学工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Qian Wang,Huanshun Yin,Jia Ding,Yunlei Zhou,Shiyun Ai
5-Formyluracil (5fU) is considered an important epigenetic modification agent involved in gene regulation, cell differentiation, and development. 5fU exists in many cells and tissues but is highly similar to the structure of 5-formylcytosine (5fC) and is less abundant in genome. Therefore, the development of a rapid, sensitive, and highly selective method to detect 5fU is desired. In this study, a photoelectrochemical biosensor based on WS2/Bi/BiOBr nanocomposites, black TiO2 (b-TiO2), and hemin/G-quadruplex was described, which was found to be highly sensitive and selective for 5-formyluracil-2′-deoxyuridine-5′-triphosphate (5fdUTP) detection. WS2/Bi/BiOBr was first employed as a photosensitive material, and 3,4-diaminobenzoic acid (DABA) was adopted as a 5fdUTP recognition and capture reagent, where DABA was captured by polyethylene polyamine through covalent reaction to form a stable amid bond. Then, a benzimidazole bond was formed between DABA and −CHO of 5fdUTP, and 5fdUTP was selectively captured on the electrode. Using b-TiO2 as a cross-linker, a guanine-rich ssDNA sequence was further immobilized on the electrode surface by covalent reaction with the 5fdUTP phosphate group. With the assistance of K+ and hemin, the hemin/G-quadruplex structure was formed on the electrode. The hemin molecules in the structure of hemin/G-quadruplex obviously enhanced the PEC response of the biosensor for detecting 5fdUTP, with a linear range of 0.005–500 nM and a detection limit of 1.53 pM (S/N = 3). In addition, this method exhibits optimistic selectivity. The precision and accuracy of this method were evaluated by studying the content of 5fdUTP in genome DNA of crop tissues with standard addition recovery experiments.
研究领域:
生物化学
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分析化学
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分子生物学
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DOI
高影响因子
ACS Applied Polymer Materials
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2022
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IF 4.855
Sining Zhu,Chen Xi,Yuzhuo Zhang,Fan Zhang
In recent years, ion-imprinting technology has been frequently employed to selectively eliminate heavy metals from aqueous solutions. In this study, an environment-friendly porous cadmium-ion-imprinted composite (Cd(II)-IIP) based on epoxy resin was prepared using Cd(II) ion as a template, polyethylene glycol as a porogen, epoxy resin as the carrier, and polyethylene polyamine as complexation agent and curing agent via surface imprinting technique and stepwise polymerization process. Cd(II)-IIP was further characterized using SEM-EDS, FT-IR, TGA, and XPS, the systematic adsorption investigation of Cd(II)-IIP for the Cd(II) ions was explored. The research found that the adsorption capacity of Cd(II) got to the maximum value (qm = 64.74 mg/g) at pH = 4.0 and T = 318 K and the Cd(II)-IIP had high selectivity for Cd(II) in the presence of polymetallic ions and still has good recoverability after five cycles. The results showed that the adsorption process was closer to the pseudo-second-order kinetic model, and the isothermal curves of the experimental data were more consistent with the Langmuir adsorption model, which indicated that the whole process of adsorption was mainly monolayer chemisorption and spontaneous endothermic. In addition, the XPS and FT-IR results indicate that the interaction between Cd(II) and functional groups is related to O or N atoms on Cd(II)-IIP. In summary, Cd(II)-IIP has certain advantages and considerable development prospects for the treatment of wastewater containing Cd(II).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
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2023
·Vol. 29
·期 6
·991-1001
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IF 2.7
Hua Zhou,Liangdong Ye,Dongming Chen,Ziwei Li,Shanrong Li,Dacheng Li,Zhiyi Huang,Zhouqiao Wei,Shaorong Lu
Graphite is a thermally conductive filler. However, when dispersed into high density poly(ethylene) (HDPE) resin, graphite particles tend to agglomerate and requires a compatibilizer to achieve desired thermal/physical properties. In this study, oleic acid (OA), a bio-based additive and polyethylene-polyamines (PEPA) were used to synthesize a new compatibilizer, PEPA-g-OA, containing numerous NR 2 groups. The experimental results showed that PEPA-g-OA can significantly improve the compatibility between graphite particles and the HDPE matrix due to uniform dispersion of graphite in the HDPE matrix. When the graphite content was 25 wt%, the thermal conductivity of the composite recorded 1.2 W m −1 K −1 (three times that of neat HDPE) and the volume resistivity was 1.8 × 10 9 Ω cm, indicating excellent electrical insulation. Compared to the composites with no graphite content, the properties of the composites with 25 wt% graphite content exhibited narrower melting and crystallization peaks, more stable mechanical properties, and higher ultraviolet aging resistance. Synthesized new bio-based compatibilizer and thermally conductive and electrically insulating composites developed in this study can be useful in different industrial fields for the preparation of the next generation composites.
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
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2023
·Vol. 40
·期 9
·2356-2364
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IF 2.7
Zhu Sining,Wan Haitao,Yan Zhibo,Xi Chen,Zhang Yuzhuo,Zhang Fan
With the continuous development of the concept of green chemistry, more attention is being paid to the selective capture of copper (II) from wastewater and its recovery and reuse. Ion imprinting technology is widely used to remove heavy metals from aqueous solutions due to its high selectivity. In this work, Cu(II) imprinted polymer (Cu(II)-IIP) was prepared by stepwise polymerization using Cu(II) ions as the template ions, PEG-600 as a pore-forming agent, epoxy resin as the carrier, and polyethylene polyamine as curing agent and complexing agent. The influences of solution pH, reaction temperature, reaction time and initial solubility of metal ions on its adsorption ability were systematically examined. The studies showed that the maximum adsorption quantity was 91.58 mg/g when pH=5 and T=318 K. The adsorption for Cu(II) of the Cu(II)-IIP was considered to be the monolayer chemisorption and spontaneous endothermic process. In the presence of multiple coexisting ions, Cu(II)-IIP had high selectivity for Cu(II). After five adsorption-desorption cycles, high removal rate could still be obtained, which means that the material provides a feasible method for treating wastewater containing Cu(II) ions.
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
高影响因子
Journal of Materials Research and Technology-JMR&T
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2022
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IF 6.267
Yufei Liu,Yikai Zhan,Min He,Chengjun Xiao,Shan Liu,Shuhao Qin,Jie Yu
Polyamines with different amino numbers were introduced on the surface of carbon fiber (CF) by a chemical grafting method to improve the interfacial properties of CF/polyamide 6 (PA6) composites. First, a carboxyl group was introduced on the surface of CF, and then polyamine was grafted onto the pretreated CF. The chemical structure of CF was confirmed by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), polarized light microscopy, and Fourier transform infrared spectroscopy (FTIR), and the performance test results of the composites were systematically analyzed. The content of N on the surface of the modified CF reached 18.92%; the interfacial shear strength (IFSS) and tensile strength of the modified CF/PA6 composite reached 58.6 MPa, respectively, which were 41.5% and 45.5% higher than those of unmodified CF/PA6 composites. The above results confirm that amino-functionalized grafting modification is an effective method to improve the interfacial compatibility and adhesion of composites to improve the mechanical properties of composites.
研究领域:
材料科学
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复合材料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）