Journal of Physical Chemistry C
·
2019
·
IF 4.309
Keyang Yin,Dandan Lu,Liping Wang,Quanxin Zhang,Junying Hao,Gaozhan Li,Hongguang Li
In the preparation of carbon dots (C dots) through pyrolysis, organic molecules with multiple functional groups are popular, and monosubstituted compounds, such as aliphatic amines, are used only as an auxiliary component. Here, we provide a strategy to transfer aliphatic amines and aliphatic aldehydes to C dots in the absence of any other reagent under mild conditions. In a typical experiment, C dots were facilely obtained by refluxing dodecylamine (C12–NH2) in chlorobenzene, which shows blue emission with wavelength-dependent characteristics. The C dots are soluble in a variety of organic solvents and can be further processed by either gel permeation chromatography or silica gel column chromatography, which gives highly pure C dots with absolute fluorescence quantum yield over 10%. The C dots are photoluminescent in the solvent-free state and can be used as fluorescent ink. They are also compatible with polymers such as poly(methyl methacrylate) and polydimethylsiloxane. Influence of the type of functional group was checked. Blue-emitting C dots were obtained as well by refluxing dodecanal in chlorobenzene, but using a compound bearing a carboxylic or hydroxy group only showed little success.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Gang Chen,Zhichao Zhou,Xiaodan Shi,Xiaolong Zhang,Sanbao Dong,Jie Zhang
Small molecule flow improver for heavy oil recovery has attracted great attention in oilfield chemistry . In this study, 24 alkylbenzenesulfonates were synthesized and evaluated as crude oil flow improvers. The results show that all of the alkylbenzenesulfonates were effective, the chromium alkylbenzenesulfonate (CrDBS) and zinc alkylbenzenesulfonate (ZnDBS) were found to have the best performance with the viscosity reduction rate of higher than 90%. Besides, the CrDBS and ZnDBS can depress the pour point of the crude oil sample by 21.0 °C and 16.0 °C, respectively. The co-crystallization of alkylbenzenesulfonate with the saturated hydrocarbons in the crude oil could disorder the wax crystals and depress the pour point. In addition, DSC was used to reveal the mechanism of viscosity reduction and pour point depressing by alkylbenzenesulfonates. The flow improver can disturb the formation of hydrogen bonds and the π-π interaction bonds among the polycyclic aromatic hydrocarbons and the resin macromolecules . Besides, the field test using ZnDBS confirmed its good performance and promising application potential in enhancing the heavy oil recovery.
研究领域:
石油化学
·
油田开发
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DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2013
·Vol. 66
·期 11
·1361-1369
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IF 1.869
Yanyan Wang,Libin Liu,Congde Qiao,Tianduo Li
N-Alkyl-substituted polyurethanes with different alkyl chain lengths were prepared from the corresponding bromoalkane (1-bromooctane, 1-bromotetradecane, and 1-bromooctadecane) and polyurethane consisting of poly(propylene glycol) (PPG), 4,4′-diphenylmethane diisocyanate, and 1,4-butanediol. The synthesised materials were characterised by 1H NMR and FTIR spectroscopy and the degrees of substitution were discussed by changing the reaction conditions. Differential scanning calorimetry and X-ray diffraction were used to characterise the thermal properties and crystalline state. Microphase-separated nanostructures, with hard segments (nanofibre-like) embedded into amorphous PPG soft segments, are observed by atomic force microscopy and scanning electron microscopy. A reversible behaviour of the films was revealed by contact angle measurement. Stimuli-responsive films were realised by solvent vapour annealing and heat treatment, and exhibited a reversible switching in surface wettability with a remarkable change in the water contact angle of 21°.
研究领域:
高分子化学
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材料科学
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表面工程
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DOI
高影响因子
TETRAHEDRON
·
2018
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IF 2.377
Lingxian Liu,Zengguang Li,Changjun Chen,Huanrong Li,Lijin Xu,Zhiyong Yu
An efficient protocol for dealkylation of aryl alkyl ethers under the catalysis of inexpensive and easily reusable Cu 2 O has been described. The phenol products were obtained in high yields, and a range of functional groups were well tolerated. The choice of solvent is critical to the catalysis, and CH 3 OH proved to be the optimal choice. Mechanistic investigations showed that this reaction possibly proceeds via a single-electron transfer (SET) process.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Jiahai Jia,Jiazhi Han,Mingjie Chen,Qing-Shan Shi,Xiaobao Xie,Yanzhu Guo
Aminoalkyl cellulose derivatives are bioactive polymers that have demonstrated important application as nanomicelles in biomedicines. However, the self-assembly behavior of aminoalkyl cellulose into nano micelles remains unclear. In this study, aminoalkyl cellulose with different degree of substitution (0.12–0.81) and varying alkyl chain lengths (C2-C6) were synthesized using tosylcellulose as an intermediate. The as-prepared aminoalkyl cellulose self-assembled into nanomicelles with particle size ranging from 121 nm to 185 nm, and ζ potential from 37.5 mV to 30.1 mV. Both the particle size and ζ-potential of the aminoalkyl cellulose micelles can be regulated by the degree of substitution, chain length of aminoalkyl groups, solution pH, ion strength, addition of fatty acids, and storage time. These findings shed light on the preparation of nanomicelles from amino cellulose derivatives, which hold important applications as biological materials.
研究领域:
生物材料学
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纳米医学
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药物递送系统
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高分子化学
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生物物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yanchen Li,Weiye Zhang,Junqi Zhao,Wenping Li,Beibei Wang,Yingni Yang,Jingmeng Sun,Xiaoyang Fang,Rongqi Xia,Yi Liu,Hongwu Guo
High dispersibility of carbon black (CB) is a great significance to its interfacial compatibility with organic or inorganic materials. We reported a type of alkyl-carbon black (aCB) nanoparticles with hydrophobic and lipophilic properties which were modified by Octadecyl isocyanate. The water contact angle of aCB was changed from 34.3°/38.9° to 102 ° , which exhibited excellent dispersion ability in organic solutions. Covalent modification of aCB was confirmed by the increase of particle size from 474 nm to 499 nm and the loss of organic groups at temperatures from 30 °C to 800 °C. After reaction between CB and Octadecyl isocyanate, the characteristic band of isocyanate ( N C O) disappeared and formed new amide groups or carbamate, the decrease of O 1 s and C 1 s and the increase of N 1 s confirmed the alkyl chain grafted to the surface of CB. aCB showed an organic-inorganic hybrid and multi-layer substance with disordered and high crystallization capacity.
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
Jove-Journal of Visualized Experiments
·
2017
·
IF 1.232
Junlian Wang,Meiying Xie,Xinyu Liu,Shengming Xu
We present the synthesis of (2,3-dimethylbutyl)(2,4,4'-trimethylpentyl)phosphinic acid as an example to demonstrate a method for the synthesis of high purity nonsymmetric dialkylphosphinic acid extractants. Low toxic sodium hypophosphite was chosen as the phosphorus source to react with olefin A (2,3-dimethyl-1-butene) to generate a monoalkylphosphinic acid intermediate. Amantadine was adopted to remove the dialkylphosphinic acid byproduct, as only the monoalkylphosphinic acid can react with amantadine to form an amantadine∙mono-alkylphosphinic acid salt, while the dialkylphosphinic acid cannot react with amantadine due to its large steric hindrance. The purified monoalkylphosphinic acid was then reacted with olefin B (diisobutylene) to yield nonsymmetric dialkylphosphinic acid (NSDAPA). The unreacted monoalkylphosphinic acid can be easily removed by a simple base-acid post-treatment and other organic impurities can be separated out through the precipitation of the cobalt salt. The structure of the (2,3-dimethylbutyl)(2,4,4'-trimethylpentyl)phosphinic acid was confirmed by 31P NMR, 1H NMR, ESI-MS, and FT-IR. The purity was determined by a potentiometric titration method, and the results indicate that the purity can exceed 96%.
研究领域:
有机化学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
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IF 4.7
Chen Chen,Xudong Zhang,Qiong Tang,Mingxing Tang,Xuekuan Li,Lei Liu,Jinxiang Dong
Using coal-based feedstocks to produce chemicals is of importance for the high value-added utilization of coal and the reduction of petroleum consumption. Alkyltetralins similar to naphthenic oil were successfully obtained through tetralin alkylation with various olefins. Various ionic liquids (ILs) were applied to catalyze alkylations, and Et 3 NHCl-AlCl 3 IL exhibited high catalytic activity under mild reaction temperature (80 °C), the selectivity of multi-alkyltetralins higher than 70% could be achieved at >99% tetralin conversion. Such catalyst was shown to be robust in the presence of trace water and oxygenated chemicals. COSMO-RS model was applied to predict the mutual solubility and interaction of tetralin, olefins and alkyltetralins in ILs. The experimental and calculated results demonstrated that the favorable interactions of shorter-chain olefins and ILs benefited to produce multi-alkyltetralins, and the low mutual solubility of reactants and products in ILs was helpful to the rapid separation of products in the system.
研究领域:
化学工程
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催化科学
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煤化工
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产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 7
·075305
·
IF 1.929
Guangtao Chang,Lei Chen,Zhanxiong Li
In this study, one novel perfluoroalkyl silane with tetrafluoro-λ6-sulfanyl bridging group named 4-(Tridecafluorohexyl sulfur tetrafluoride) Phenylethyl trichlorosilane (PFSTS) was successfully synthesized via fluorination and hydrosilylation. The structure was characterized by FT-IR and NMR Then, the product and the control subject 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS) were finished onto PET fabrics through the method of dip-and-pad. The wettabilities of the treated PET fabrics were characterized by Water Contact Angles (WCA) and surface free energies measurements. X-ray Photo electron Spectroscopy (XPS) was used to validate the attachment, together with the chemical composition of the polymers on the surface of treated PET fabrics. The WCAs of PFOTS@PET and PFSTS@PET were 142.2°, 137.3°, while the WCA of untreated PET fabrics is 120° in general, indicating that PFTOS and PFSTS can provide good hydrophobicity by finishing PET fabrics. After the 48 h exposure to accelerated agingUV irradiation, sample of PFSTS@PET show a decreased CA value by 12.5% from 137.3° to 120.1°, while for sample of PFOTS@PET, the percentage of reductionis only 2.8%. It was found that the perfluoroalkyl trichlorosilane that containing –SF4– bridged group exhibited excellent water-repellency properties and had higher potential to UV degrade as possessing weak bond energy of C–S bond, so the PFSTS might act as an eco-friendly alternative to carbon-chain perfluoroalkyl derivatives in water-repellency areas.
研究领域:
材料化学
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纺织科学
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表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2018
·
IF 1.454
R. X. Niu,J. Y. He,B. Long,D. Q. Wang,H. Song,C. Wang,G. M. Qu
Nonylphenol dodecyl sulfonate (C12NPAS) has been synthesized, and mixed with heavy alkyl benzene sulfonates (HABS) in different proportions. The effects of different mixing ratios on properties such as adsorption, wetting, foaming, and emulsification, of the C12NPAS/HABS surfactant mixtures have been systematically investigated. Experimental results have shown that, after mixing, the wetting and foaming properties of C12NPAS/HABS are improved remarkably. Compared with C12NPAS and HABS alone, the adsorption and emulsifying properties of C12NPAS/HABS are far superior, which we attribute to a synergistic effect between these surfactants.
研究领域:
化学
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表面科学
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产品关联
DOI
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2022
·Vol. 59
·期 1
·39-50
·
IF 1.058
Fuwen Tan,Xu Li,Jinxiang Dong
Fischer-Tropsch syncrude prepared via the Fischer-Tropsch synthesis (FTS) using a Fe-based catalyst is featured by its high content of linear α-olefins (C 5 –C 13 ). The utilization of C 6 –C 8 α-olefins for the synthesis of alkyl benzene sulfonate surfactants was performed in the present work via dimerization, benzene alkylation, and sulfonation. The effects of the reaction conditions on benzene alkylation over a trimethyl amine hydrochloride-acidic anhydrous aluminum chloride ionic liquid catalyst (Et 3 NHCl-AlCl 3 ) have been studied in detail using C 6 α-olefin dimers as a model alkylation agent. Under the optimal reaction conditions (molar ratio of AlCl 3 to Et 3 NHCl = 2, catalyst loading = 0.29 mol %, reaction temperature = 30 °C, and molar ratio of benzene to C 6 α-olefin dimer = 10) the conversion of the C 6 α-olefin dimer was 100% and the selectivity toward the mono alkylbenzene product was 91.0%. C 6 –C 8 α-olefin dimer alkylbenzene sulfonates (C 6 –C 8 DBS) were synthesized via sulfonation using chlorosulfonic acid and characterized using Fourier Transform Infrared (FT-IR) spectroscopy and Liquid Chromatography–Mass Spectrometry (LC–MS). The surfactant properties of the C 6 –C 8 DBS, including their equilibrium and dynamic surface tension, foaming, wetting and emulsifying capabilities, were closely explored and compared with a commercial linear alkylbenzene sulfonate (LAS). The limiting surface tension ( γ
CMC = 34.62 mN m −1 ) and critical micelle concentration (CMC = 2.15 mmol L −1 ) of C 6 α-olefin dimer alkylbenzene sulfonate (C 6 -DBS) were similar to those of LAS. Upon increasing the hydrocarbon chain length, the γ
CMC of C 6 -DBS, C 7 -DBS, and C 8 -DBS remained unchanged, while the CMC decreased. C 6 –C 8 -DBS exhibited foaming, emulsifying, and wetting properties comparable to LAS.
研究领域:
化学工程
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材料科学
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Ling Liu,Yizhe Zhu,Zitao Chai,Ruifen Zheng,Zhiqiang Zeng,Caiming Tang
This study developed a rapid and reliable liquid chromatography high-resolution mass spectrometry (LC-HRMS) method for the simultaneous determination of 8 alkylamines and 12 alkylamides in meat products. Sample preparation and instrumental conditions were optimized to achieve efficient extraction and accurate quantification. Meat samples were extracted with methanol-acetonitrile mixture (1:1, v / v ) using vortex-ultrasonication for 15 min, followed by evaporation and reconstitution prior to analysis. The mobile phases were ultrapure water containing 0.1% formic acid and acetonitrile, and a gradient elution program was employed. Mass spectrometric analysis was performed in positive electrospray ionization mode with full scan and data-dependent acquisition. Quantification was carried out using an internal standard method. The limits of quantification were 5 ng/g, and calibration curves showed good linearity. Recoveries ranged from 85.2% to 103.0% with relative standard deviations (RSDs) of 0.3-8.0%, and matrix effects ranged from 61.7% to 109.6% with RSDs of 0.2-10.3%. The method was successfully applied to meat samples collected from local markets, with concentrations of individual alkylamines and alkylamides ranging from below the detection limit to 13105.0 ng/g. Migration experiments indicated that alkylamines and alkylamides could transfer from plastic materials into meat, with migration extent increasing with the increase of contact time and temperature. Hydrophobic alkylamides migrated more rapidly in early stage, while some alkylamines continued to migrate at low temperatures, indicating that meat characteristics and contact conditions could significantly affect the migration. The developed method is suitable for the determination of alkylamines and alkylamides in meat products, and can provide a reference approach for assessing the potential migration and exposure risks of alkylamines and alkylamides.
研究领域:
分析化学
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食品科学
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毒理学
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食品安全
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药物代谢
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环境健康
✓ 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）