Nanoscale
·
2017
·Vol. 9
·期 43
·16755-16763
·
IF 7.367
Kaixi Bi,Quan Xiang,Yiqin Chen,Huimin Shi,Zhiqin Li,Jun Lin,Yongzhe Zhang,Qiang Wan,Guanhua Zhang,Shiqiao Qin,Xueao Zhang,Huigao Duan
We report an electron-beam lithography process to directly fabricate graphene@copper composite patterns without involving metal deposition, lift-off and etching processes using copper naphthenate as a high-resolution negative-tone resist. As a commonly used industrial painting product, copper naphthenate is extremely cheap with a long shelf time but demonstrates an unexpected patterning resolution better than 10 nm. With appropriate annealing under a hydrogen atmosphere, the produced graphene@copper composite patterns show high conductivity of ∼400 S cm−1. X-ray diffraction, conformal Raman spectroscopy and X-ray photoelectron spectroscopy were used to analyze the chemical composition of the final patterns. With the properties of high resolution and high conductivity, the patterned graphene@copper composites could be used as conductive pads and interconnects for graphene electronic devices with ohmic contacts. Compared to common fabrication processes involving metal evaporation and lift-off steps, this pattern-transfer-free fabrication process using copper naphthenate resist is direct and simple but allows comparable device performance in practical device applications.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yi Zheng,Qiuya Zhang,Haoran Chi,Yize Liu,Hongwei Ren
As a typical pollutant in petrochemical wastewater, naphthenic acids are highly ecotoxic and difficult to biodegrade due to its robust structure. The advanced oxidation process has always been the research hotspot for naphthenic acids degradation and removal. In this work, with low cost and biomass fructose as raw material, Si-doped carbon quantum dots (Si-CQDs) and its composite material (MoS 2 /Si-CQDs) of Flower-like molybdenum disulfide (Flower-like MoS 2 ) were targeted synthesized by hydrothermal method, and characterized by Transmission electron microscope, Scanning electron microscope, X-Ray diffraction, UV-Vis spectroscopy, and Raman spectrum. To study the activation of prepared materials in naphthenic acid oxidative degradation, the influencing factors of kinds of materials, reaction temperature, the dosage of catalyst and persulfate were all explored systematically. The experiments showed that the naphthenic acid degradation rate of MoS 2 /Si-CQDs@NaPS system could reach more than 99 % in 120 min, and the relationship between the naphthenic acid degradation rate and the reaction temperature was in accordance with the quasi-primary kinetic equation. In mechanistic studies, the role of free radical and non-free radical pathways in oxidative degradation was verified. After five reuse cycles, the catalyst can still achieve a degradation rate of over 80 %. Finally, the experiment also tested the effectiveness of MoS 2 /Si-CQDs@NaPS system in real naphthenic acids wastewater, and the production cost of its removal of naphthenic acids was economically analyzed, showing that MoS 2 /Si-CQDs is a promising composite with stability and cost-effectiveness, and provides a new material for naphthenic acid degradation that can achieve a dual degradation pathway.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Hongwei Ren,Yize Liu,Ruoyao Zhang,Yi Zheng,Tengda Zhao,Jing Han,Chunmao Chen,Erhong Duan
Naphthenic acids (NAs) are toxic components in refinery wastewater and in oil sands process water. The presence of NAs in aqueous environments would cause serious environmental problems. Development of a rapid method for screening and determination of trace NAs is urgent. In this work, a near-infrared fluorescence carbon quantum dots (CQDs) was successfully synthesized with p -phenylenediamine (PPD) and polyethylene glycol 400 (PEG 400) by the hydrothermal method. It showed a good fluorescence response to NAs with good detectability. The limit of detection was calculated to be 0.16 mmol‧L −1 , with a linear range from 0.5 to 15 mmol‧L −1 . The detection mechanism of NAs and CQDs was also proposed with in situ infrared spectrometer . This work provides new insights into the fluorescence detection of CQDs in the petrochemical industry, broadening the application of CQDs in the detection of environmental organic pollutants .
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
XiangSheng Shao,Guanhao Liu,Jingyi Yang,Xinru Xu
Three kinds of imidazolium ionic liquids were synthesized, and [Bmim][CH3COO] was selected as a result of its higher deacidification rate at a lower cost. Then, the synthetic ionic liquid was immobilized by layered double hydroxides, and the composites were characterized by Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance (1H NMR), carbon-13 nuclear magnetic resonance (13C NMR), electrospray ionization mass spectrometry (ESI–MS), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and N2 adsorption–desorption isotherms. The results showed that [Bmim][CH3COO] synthesized by the intercalation method exhibited a better deacidification property compared to the dipping method. When [Bmim][CH3COO]/Mg0.5Ca2.5Al1 (I) synthesized by the intercalation method was used as a reagent, the deacidification rate reached 97.61%. The optimum reaction conditions were at the reagent/oil mass ratio of 0.08, the reaction temperature of 313 K, and the reaction time of 1 h. Moreover, the composites still had excellent performance on deacidification after being repeatedly used 6 times.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2019
·
IF 3.517
Mingjin Fan,Jia Ai,Chenghong Hu,Xin Du,Feng Zhou,Weimin Liu
In this paper, we present the synthesis and tribological properties of two naphthatate-based lubricating oils. The structure and purity of the oils were analyzed using nuclear magnetic resonance spectra and high resolution mass spectra. Their thermal and oxidation stability, flash point and pour point, viscosity and viscosity index, and friction reduction and anti-wear properties were also tested. In the results, the two isooctyl naphthatate-based oils (INA) displayed better lubricating properties than a reference sample of isooctyl sebacate (ISE) on three different friction pairs . The new oils also offered higher oxidation stability than the reference sample. It was found that the stability and lubrication properties of ester-based lubricating oils can be significantly improved by introducing a naphthalene ring into the molecular structure. This is because there is a large π-electron conjugate system on the naphthalene ring, which not only reduces the likelihood of an oxidation chain reaction, but also enables the oil to form an orderly and stable lubricating film on metal surfaces. One of the oils, 2,3-INA, was found have better oxidation stability than the other one, 1,4-INA, because its oxidized groups are positively affected by the steric and conjugation effects of the two ester groups.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
E-POLYMERS
·
2017
·Vol. 17
·期 4
·333-340
·
IF 0.949
Jun Song,Mei Liu,Zhanping Yang,Songwei Xu,Bowen Cheng,Pengfei Fei
Commercial cellulose diacetate with a degree of substitution (DS) of 2.45 was partly deacetylated to cellulose acetate (CA) with different DSs by acid-catalyzed hydrolysis and then reacted with 1-naphthoyl chloride (NpCl) to synthesize CA naphthoate (CANp). Fourier transform infrared and 1 H-NMR were used to characterize the chemical structure of CANp. The DS of naphthoate moiety (DS CANp ) could be varied from 0.18 to 0.98 by adjusting the molar ratio of –OH in CA unit to NpCl, the DS of CA (DS CA ), and the reaction time and temperature. When DS CA was 2.01 and the molar ratio was 1:6, the maximum DS CANp of the product was achieved after a reaction at 80°C for 2 h. With the increase of DS CANp , the thermal stability decreased slightly whereas the anti-ultraviolet property was enhanced. Moreover, the obtained films containing CANp exhibited good ultraviolet resistance as well as chemical resistance.
研究领域:
材料科学
·
有机化学
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产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2021
·
IF 4.346
Qi Wu,Yan Xu
Stimulus-responsive surfactant is becoming a hot research topic with high controllability and excellent emulsifying properties. In this work, an amidine naphthenate surfactant was synthesized for the first time by the reaction between alkyl amidine and naphthenic acid. Surface activity and emulsion performance of this novel surfactant in oil/water emulsion were investigated. Compared with the previously synthesized amidine bicarbonate surfactants, amidine naphthenate surfactants exhibited a superior emulsification performance above 60 °C due to their lower critical micelle concentration (CMC) and interfacial tension (IFT). The presence of two long alkyl groups is recognized as the main reason for its superior properties than amidine bicarbonate having only one long alkyl group. Increased hydrophobic interactions between the long alkyl chains and electrostatic interactions between the ionic head groups lead to the easier formation of micelles. Notably, the amidine naphthenate has a characteristic of CO 2 -responsive property. The amidine naphthenate emulsion can be demulsified by CO 2 bubbling which destroys the chemical structure of amidine naphthenate, accompanied by the formation of amidine cations and naphthenic acids. Then, the emulsion was completely demulsified due to the demulsification effect of naphthenic acid. Therefore, the synthesized amidine naphthenate surfactant possesses not only high interface activity but also CO 2 responsive property, which endows it an extensive application prospect for enhanced oil recovery (EOR) operations in the oil industry.
研究领域:
化学
·
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
FITOTERAPIA
·
2022
·
IF 3.204
Chao Wang,Quan-Hao Wei,Zhen-Qiang Xin,Lin-Lin Tian,Jun-Sheng Zhang,Hua Zhang
Chemical fractionation of the EtOH extract of the roots of a traditional Chinese herb, Morinda officinalis , afforded an array of methyl 2-naphthoate derivatives ( 1 – 9 ) including four pairs of enantiomers ( 1 – 4 ), two pimarane diterpenes and two ursane triterpenoids . Among them, eight compounds ( 1a / 1b - 3a / 3b , 11 and 13 ) were reported in the current work for the first time. The structures of the new compounds, including their absolute configurations, were defined by spectroscopic analyses in combination with quantum chemical electronic circular dichroism (ECD) and gauge-independent atomic orbital (GIAO) NMR calculations. All the isolates were evaluated for their inhibitory effect on nitric oxide (NO) production induced by lipopolysaccharide (LPS) in murine RAW264.7 macrophage cells, and the enantiomers 1a and 3b exhibited moderate activity with IC 50 values of 41.9 and 26.2 μM. Meanwhile, compound 3b also dose-dependently inhibited the secretion of two pro-inflammatory cytokines TNF-α and IL-6 in the same cell model.
研究领域:
药理学
·
天然产物化学
·
药物化学
·
免疫学
✓ 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）