JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Wenna Zhang,Wenwen Zhang,Shuai Chen,Bin Guo,Hua Gu,Yu Xue,Zexu Xue,Jingkun Xu
In recent years, polyselenophene and its derivatives have been paid more attention due to their unique properties such as lower band gaps and redox potentials . However, the poor solubility and molecular rigidity of polyselenophene and its derivatives limit them to use in flexible optoelectronic devices. Therefore, in order to enrich the structures and properties, fully understand the structure-property relationship and further improve the electrochromic performances of polyselenophene and its derivatives, we synthesized its propyl-analogues as precursors, to electrosynthesize three conducting polymers , poly(3,4‑propylenedioxyselenophene) (PProDOS) and its alkyl-modified derivatives, poly(3,3′‑dimethyl‑3,4‑dihydro‑2H‑selenopheno[3,4‑b][1,4]dioxepine) (PProDOS-C 1 ) and poly(3,3′‑dibutyl‑3,4‑dihydro‑2H‑selenopheno[3,4‑b][1,4]dioxepine) (PProDOS-C 4 ). The electrochemical and spectroelectrochemical behaviors of PProDOS and PProDOS-C n (n = 1, 4) were investigated in detail in an ionic liquid , 1‑butyl‑3‑methylimidazolium hexafluorophosphate (BmimPF 6 ). Results showed that PProDOS-C 1 and PProDOS-C 4 exhibited superior electrochromic performances such as high optical contrast (62%) and excellent coloration efficiency (573 cm 2 C −1 ). In addition, as the alkyl chains increased, the onset oxidation potentials of monomers and the optical band gaps of polymer films decreased and the electrochemical activity of polymers increase. These polymers supply varied electrochromic colors and have prospect in display application.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Weiping Kong,Yong Liu,Fujian Liu
Efficient micro-meso-macroporous solid acids spheres with controllable acid strength were successfully synthesized by simultaneous grafting of −SO3H and −SO2CF3 onto the network of commercial XAD-4 resin. The synthesized solid acids are designated as XAD-4-SO3H and XAD-4-SO3H-SO2CF3. Various characterizations show that XAD-4-SO3H and XAD-4-SO3H-SO2CF3 possess high BET surface areas, hierarchical porous structures with combined micro-meso-macropores, high concentrations of acid sites, and strong acid strength. Catalytic tests show that XAD-4-SO3H and XAD-4-SO3H-SO2CF3 exhibit superior activities and good reusability in various acid-catalyzed reactions including esterification of acetic acid with cyclohexanol, acylation of anisole with acetyl chloride, and catalytic synthesis of bisphenol A. Their activities were better than the solid acids of Amberlyst-15, SBA-15-SO3H-0.1, H3PW12O40, and acidic zeolites. This work develops a new method for scalable transformation of commercially macroporous resin into efficient porous solid acids, which promotes their wide use in industrial catalysis.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Halidan Maimaiti,Abuduheiremu Awati,Gunisakezi Yisilamu,Dedong Zhang,Shixin Wang
For decades, researchers have been looking for a high-efficiency, low-cost, and environment-friendly photocatalyst for CO 2 reduction. In this work, we employed SOCl 2 chlorination and EDA passivation to decorate the surface of nanocellulose crystals (NCC), and obtained aminated cellulose crystal NCC-EDA. Next, using coordination and dispersion of amino, hydroxyl, and other functional groups at the NCC-EDA surface, the TiO 2 nanoparticles synthesized in-situ from Ti(OBu) 4 were coated by NCC-EDA via a hydrothermal synthesis approach. Subsequently, the composite photocatalyst TiO 2 /NCC-EDA with various NCC-EDA contents was fabricated. The structure, optical properties, and photocatalytic CO 2 reduction performance of the photocatalyst were measured. The results suggest that the NCC-EDA based composite catalyst has highly efficient electron-hole separation and electron transfer as well as excellent CO 2 adsorption ability. The TiO 2 /NCC-EDA exhibits outstanding photocatalytic CO 2 to HCOOCH 3 conversion performance. At reaction time of 6 h, the HCOOCH 3 yield is 372.85 µmol/g cat, which is 4.5 times the yield of pure TiO 2 photocatalyst.
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RSC Advances
·
2018
·Vol. 8
·期 63
·35989-35997
·
IF 2.936
Halidan Maimaiti,Abuduheiremu Awati,Dedong Zhang,Gunisakezi Yisilamu,Bo Xu
To obtain high-efficiency, low-cost, environmentally friendly carbon-based photocatalytic material, we synthesized coal-based carbon dots with sp2 carbon structure and multilayer graphene lattice structure by the hydrogen peroxide (H2O2) oxidation method to strip nano-scale crystalline carbon in the coal structure and link with oxygen-containing groups such as the hydroxyl group. N, S co-doped aminated coal-based carbon nanoparticles (NH2-CNPs) were then obtained by thionyl chloride chlorination and ethylenediamine passivation. The physical properties and chemical structure of the synthesized NH2-CNPs were studied and the photocatalytic CO2 reduction performance was tested. The results show that NH2-CNPs are vesicle-type spherical particles with particle size of 42.16 ± 7.5 nm and have a mesoporous structure that is capable of adsorbing CO2. A defect structure was formed on the surface of the NH2-CNPs due to the doping of N and S elements, thereby significantly improving the ability to photogenerate electrons under visible light along with the ability to efficiently separate the photo-generated carriers. The photocatalytic reduction products of CO2 over NH2-CNPs were CH3OH, CO, C2H5OH, H2 and CH4. After 10 hours of reaction, the total amount of products was 807.56 μmol g−1 cat, the amount of CH3OH was 618.7 μmol g−1 cat, and the calculated selectivity for conversion of CO2 to CH3OH was up to 76.6%.
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PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
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IF 2.004
Shuhan Chen,Zongbi Bao,Zhengzhang Lü,Yiwen Yang,Weiguo Xu,Zhongmin Chen,Qilong Ren,Baogen Su,Huabin Xing
Vapor–liquid equilibrium (VLE) data for binary mixture of sulfuryl chloride and 1,1,1-trifluorotrichloroethane at atmospheric pressure were measured with a double-phase circulation still. The experimental VLE data were correlated well with the Wilson, the nonrandom two-liquid (NRTL), and the universal quasichemical activity coefficient (UNIQUAC) models, respectively. From the correlation results, it is revealed that there is no azeotrope presented in the binary system. All of the experimental VLE data passed the thermodynamic consistency tests performed by the Herington and the Van Ness methods.
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FOOD CHEMISTRY
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2014
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IF 3.259
Zai-yong Li,Hong-jiang Quan,Cheng-bin Gong,Yu-zhu Yang,Qian Tang,Yu-bo Wei,Xue-bing Ma,Hon-wah Lam
A novel photoresponsive molecularly imprinted polymer (MIP) was developed for the selective extraction of guanine from complex samples. The photoresponsive MIP was fabricated using guanine as the template, water-soluble 5-[(4-(methacryloyloxy)phenyl)diazenyl]isophthalic acid as the functional monomer, and water-soluble triethanolamine trimethacrylate as the cross-linker. The MIP displayed good selectivity toward guanine with a dissociation constant of (2.70 ± 0.16) × 10 −5 mol L −1 in aqueous media. The density of the guanine-specific receptor sites in the MIP material was (4.49 ± 0.22) μmol g −1 . Quantitatively release and uptake of guanine by the MIP occured with irradiation at 365 and 440 nm, respectively. The MIP could efficiently extract guanine from beer and then release it into aqueous media under photocontrol. This method could be used for selective separation and subsequent determination of a specific analytes from complex samples.
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PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2016
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IF 1.045
Shuyan Shan,Xinggang Chen,Zhenjie Xi,Xiaoyan Yu,Xiongwei Qu,Qingxin Zhang
Resorcinol-based phthalonitrile (R-CN)/nano-aluminum oxide (Al2O3) nanocomposites were prepared via a two-step approach. Firstly, Al2O3 was functionalized with nitrile groups on the surface of Al2O3 nanoparticles, which was confirmed by Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy (SEM). The effect of nano-Al2O3 particles on thermomechanical and flexural properties has been evaluated for different weight ratios ranging between 0% and 5%. Compared with pure nano-Al2O3, nitrile-functionalized Al2O3 (CN-Al2O3) particles showed a more significant enhancement effect on the properties of R-CN resin. The storage modulus of nanocomposite with 5 wt% CN-Al2O3 reaches 2679 MPa at 25°C, which is much higher than that of the pure R-CN resin. For 3 wt% CN-Al2O3-reinforced R-CN composites, it showed an increase of 54.84% in flexural strength and 21.48% in flexural modulus. SEM was employed to explore the fracture surface of composites. Micrographs of fracture surface analysis confirmed that the toughness of R-CN resin can be improved significantly by incorporating CN-Al2O3 nanoparticles.
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RSC Advances
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2017
·Vol. 7
·期 76
·48120-48126
·
IF 3.108
Danhua Xie,Donghong You,Shaoming Ying,Binglei Song,Jinnian Tian
Exploration of novel wormlike micelle systems is important for both the theory and applications of surfactant self-assembly. A new anionic surfactant, sodium 2-phenoxyhexadecanoate (sodium Ph-C16), was synthesized in this work. This surfactant can self-assemble in solution to form wormlike micelles with the help of a bolaform salt, ethane-1,2-bis(trimethyl ammonium bromide) (N-2-N bromide), by removing inorganic salts. The resultant aqueous system was investigated using rheological measurements, freeze-fractured-TEM and 2D NOESY 1H NMR experiments. A supramolecular gemini-like structure constructed from electrostatic interactions was a prerequisite for the wormlike micelle formation. The zero shear viscosity (η0) of the system had a very strong dependence on the surfactant concentration with a scaling exponent of 16.8 in the semi-dilute region, which is attributed to the extremely strong electrostatic attraction between the surface-active anions and bolaform cations. These results are beneficial for understanding anionic wormlike micelles in the absence of inorganic salts.
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Science China-Chemistry
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2017
·Vol. 60
·期 9
·1191-1196
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IF 4.132
Ji Shaobo,El Mard Hicham,Smet Mario,Dehaen Wim,Xu Huaping
Macrocycles possess potential applications in supramolecular chemistry and biosystems. Thus development of new kinds of macrocycles is of significance. Herein, novel macrocycles containing Se–Se/Se–S bonds were synthesized via transformation between selenium related dynamic covalent bonds. A monomer containing two ebselen moieties was synthesized ( M1 ). The Se–N bonds in M1 were reduced by dithiothreitol, forming Se–S linked dimer ( D1 ). To realize the transformation from Se–S bonds to Se–Se bonds, guest molecules were added as template, triggering the formation of Se–Se linked dimer ( D2 ). The formation of these two new kinds of macrocycles was determined by 1 H NMR and 77 Se NMR, and the necessity of guest molecules was also confirmed. The introduction of ebselen moieties and Se–S bonds or Se–Se bonds into macrocycles may endow it with new responsiveness and bioactivities, as well as new types of host-guest chemistry.
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ANALYST
·
2011
·Vol. 136
·期 24
·5302-5307
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IF 3.913
Hongyue Guo,Changhu Chu,Yan Li,Bingcheng Yang,Xinmiao Liang
Ion chromatography (IC) is one of the most powerful analysis technologies for the determination of charged compounds. A novel click lysine stationary phase was prepared viaCu(I) catalyzed alkyne-azide 1,3-dipolar cycloaddition (CuAAC) and applied to the analysis of inorganic ions. The chromatographic evaluation demonstrated good performance (e.g. the plate number of thiocyanate is ∼50 000 plates m−1) and effective separation ability for the common inorganic anions with aqueous Na2SO4 eluent. The separation mechanism was observed to be mainly dominated by ion exchange interaction. The retention of these analytes is highly dependent on the pH value of eluent. Compared with the lysine stationary phase prepared via the conventional manner, the click lysine exchanger demonstrated shorter retention time and better ion separation characteristics under the same chromatographic conditions, which is a great advantage for rapid separation and analysis of inorganic ions.
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JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Ji Xiaoli,Chen Fan,Liu Jian,Ma Qianqian,Qiao Ruochen,Xu Zhihao
This study details microwave-absorbing materials made of multi-walled carbon nanotubes (MWCNTs) and silicon nitride (Si 3 N 4 ). The synthesis of MWCNTs/Si 3 N 4 nanocomposites (NCs) involves combining alkyne-functionalized multi-walled carbon nanotube (MWCNTs-ALK) nanoparticles (NPs) with azide-functionalized silicon nitride (Si 3 N 4 –N 3 ) NPs through a click reaction. In order to analyze the morphology and structure of the MWCNTs/Si 3 N 4 NCs, scanning electron microscopy, x-ray photoelectron spectroscopy, x-ray diffraction, and infrared analysis techniques are employed. The electromagnetic properties of the NCs are evaluated using a vector network analyzer. The results indicate when this feeding ratio of MWCNTs-ALK and Si 3 N 4 –N 3 was 1:2 and a matching thickness of 3.0 mm at 6.82 GHz, the minimum reflection loss reaches − 30.7 dB. Additionally, with a feeding ratio of 1:1 and a matching thickness of 1.5 mm, the bandwidth below − 10 dB ranges from 11.6 to 15.8 GHz. The compositions of MWCNTs/Si 3 N 4 synthesized by click reactions indicate that, compared to physical mixed samples, our material has superior wave-absorbing properties. This improvement can be attributed to the covalent bonding between MWCNTs and Si 3 N 4 facilitated by the click reaction, resulting in enhanced dielectric loss and impedance matching. The results of this study have significant implications for the processing of composite microwave-absorbing materials and offer novel insights into the design of multifunctional microwave-absorbing materials. Graphical
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BULLETIN OF MATERIALS SCIENCE
·
2024
·Vol. 47
·期 3
·1-13
·
IF 1.9
Ji Xiaoli,Ma Qianqian,Liu Jian,Yuan Haoze,Ma Xukai
Titanium dioxide/multi-walled carbon nanotubes (TiO 2 /MWCNTs) are nanocomposites (NCs) prepared via click reaction of TiO 2 nanoparticles (TiO 2 NPs) with azide groups (TiO 2 –N 3 ) on the surface and MWCNTs with alkynyl groups (MWCNTs–ALK) on the surface. The phase structure, graphitization degree, structure, elemental composition, the microstructure of TiO 2 /MWCNTs NCs were characterized by XRD, Raman, IR, XPS and SEM, and their electromagnetic (EM) parameters were determined by the vector network analyser. For TiO 2 /MWCNTs NCs with click reaction, the minimum reflection loss (RL min ) is up to −47.87 dB at 12.02 GHz, the matching thickness is 2.0 mm, and the bandwidth is lower than −10 dB in the range of 7.7–12.48 GHz. Compared with the physically mixed TiO 2 /MWCNTs composites, TiO 2 /MWCNTs NCs prepared by click reaction show more excellent EM absorption properties, which is mainly due to the binding of covalent bonds between the two kinds of materials that lead to the enhancement of interfacial effects, the improvement of impedance matching and the increase of electron migration.
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