COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Hui Liu,Hongyan Li,Bin Lu,Songnan Li,Jingxiang Zhao,Qinghai Cai
A composite catalyst was prepared by impregnation of ZSM-5 in mixture solution of Co(NO 3 ) 2 , ZrOCl 2 and phosphotungstic acid (PW) and characterized by XRD , FT-IR, UV–vis, XPS , SEM and TEM techniques to confirm its structure and composition . The pre-prepared composite is composed of Co 2 (PO 4 )Cl, ZrO 2 , P 2 O 5 and WO 3 crystalline nanoparticles uniformly dispersed on ZSM-5 zeolite . The prepared composite demonstrates effective catalytic function for solvent-free oxidation of toluene into benzaldehyde with H 2 O 2 oxidant, achieving 16.6% conversion and 90% selectivity . The effect of various components composed of the catalyst and reaction conditions on the catalytic function were explored. Moreover, the recovery and reusability of the catalyst were estimated, presenting good reusability.
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高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Feng Yao,Jiao Tifeng,Yin Juanjuan,Zhang Lun,Zhang Lexin,Zhou Jingxin,Peng Qiuming
The effective synthesis and self-assembly of nanocomposites were of key importance for a broad range of nanomaterial applications. In this work, new carbon nanotube (CNT)-Cu 2 O nanocomposites were successfully synthesized via a facile approach. CNT was selected as the anchoring substrate to load Cu 2 O nanoparticles to prepare composite catalysts with well stability and good reusability. It is discovered that the prepared CNT-Cu 2 O nanocomposite materials could be effectively controlled via regulating preparation temperature and time without the use of any stabilizing agents. The nanostructures of synthesized composites were well characterized by many techniques, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). And the prepared CNT-Cu 2 O nanocomposites with optimized preparation conditions as new catalyst displayed excellent catalytic performance on the reduction reaction of p-nitrophenol, demonstrating potential applications for environmental governance and composite materials.
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DOI
PubMed
高影响因子
ACTA PHARMACOLOGICA SINICA
·
2018
·Vol. 40
·期 1
·133-142
·
IF 3.562
Zhang Yi-ting,Yu Yu-qi,Yan Xiao-xia,Wang Wen-jie,Tian Xiao-ting,Wang Le,Zhu Wei-liang,Gong Li-kun,Pan Guo-yu
Berberine, berberrubine, thalifendine, demethyleneberberine, jatrorrhizine, and columbamine are six natural protoberberine alkaloid (PA) compounds that display extensive pharmacological properties and share the same protoberberine molecular skeleton with only slight substitution differences. The oral delivery of most PAs is hindered by their poor bioavailability, which is largely caused by P-glycoprotein (P-gp)-mediated drug efflux. Meanwhile, P-gp undergoes large-scale conformational changes (from an inward-facing to an outward-facing state) when transporting substrates, and these changes might strongly affect the P-gp-binding specificity. To confirm whether these six compounds are substrates of P-gp, to investigate the differences in efflux capacity caused by their trivial structural differences and to reveal the key to increasing their binding affinity to P-gp, we conducted a series of in vivo, in vitro, and in silico assays. Here, we first confirmed that all six compounds were substrates of P-gp by comparing the drug concentrations in wild-type and P-gp-knockout mice in vivo. The efflux capacity (net efflux) ranked as berberrubine > berberine > columbamine ~ jatrorrhizine > thalifendine > demethyleneberberine based on in vitro transport studies in Caco-2 monolayers. Using molecular dynamics simulation and molecular docking techniques, we determined the transport pathways of the six compounds and their binding affinities to P-gp. The results suggested that at the early binding stage, different hydrophobic and electrostatic interactions collectively differentiate the binding affinities of the compounds to P-gp, whereas electrostatic interactions are the main determinant at the late release stage. In addition to hydrophobic interactions, hydrogen bonds play an important role in discriminating the binding affinities.
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PubMed
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 36
·5519-5525
·
IF 3.382
Hao Wu,Jingkang Wang,Fei Li,Qi Liu,Shuyi Zong,Jingtao Bi,Na Wang,Guoqiang Shan,Hongxun Hao
Promoting crystal growth is of great practical importance in the pharmaceutical industry, especially for manufacturing large crystals. In this work, intensification of crystal growth was investigated by using p-toluamide as a model compound. The crystal habit and the functional groups of different crystal faces of p-toluamide were analyzed from the crystal structure data. The growth rate of the (100) and (011) faces of p-toluamide was systematically measured by single crystal experiments and the effect of additives on crystal growth was evaluated. It was found that different additives could selectively promote the growth of specific crystal faces. Molecular simulation was used to investigate the influence mechanism of additives on (011) crystal face growth. It was revealed that the special promotion effect is due to the fact that the additive molecules repel the solvent molecules which exhibit a stronger inhibiting effect, thus eliminating the negative influence of the solvent on the surface diffusion of p-toluamide.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 5
·e4850
·
IF 3.259
Mingliang Ma,Yuying Yang,Yanyan Liu,Wenting Li,Guopeng Chen,Yong Ma,Ping Lyu,Shunhe Li,Yubao Wang,Guanglei Wu
In this paper, a simple route for palladium (Pd) nanoparticles attached to the surface of hollow magnetic Fe 3 O 4 /P (GMA-DVB)-polyethyleneimine (PEI) microspheres was established. Due to the large amount of imidogen groups and tertiary amine groups presenting in the PEI, Pd 2+ ions could be anchored to the support by complexation with a polyfunctional organic ligand. Thereafter, a magnetic Pd catalyst having a high loading amount and good dispersibility was obtained by reducing Pd 2+ ions. Afterwards, the prepared catalyst was characterized by TEM, SEM, FTIR, XRD, TGA, VSM, and UV–vis in detail. Ultimately, their catalytic activity was evaluated using the reduction of 4-nitrophenol (4-NP). Research showed that the Fe 3 O 4 /P (GMA-DVB)-PEI/Pd catalyst possessed high catalytic performances for the reduction of 4-NP with a conversion rate of 98.43% within 540 s. Furthermore, the catalyst could be easily recovered and reused at least for nine successive cycles.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2018
·
IF 1.946
Amin Khan,Li Wang,Haojie Yu,Muhammad Haroon,Raja Summe Ullah,Ahsan Nazir,Tarig Elshaarani,Muhammad Usman,Shah Fahad,Kaleem-ur-Rehman Naveed
Three novel polymers (P(FHEMA- co -MAAT)s) having redox and photoresponsive moieties were prepared by free radical polymerization . The structures and molecular weights of the synthesized copolymers were characterized by nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) respectively. Thermal properties, optical features and electroactive properties were studied with the help of thermogravimetric (TG), differential thermogravimetric (DTG) analysis, ultraviolet-visible spectroscopy (UV-vis) and cyclic voltammetry (CV). It was seen that synthesized copolymers had excellent redox and photoresponsive properties. These results exhibited that these polymers can be applied further for redox/photo responsive information storage devices.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Haihua Wang,Pan Zhang,Guiqiang Fei,Yongning Ma,Nana Rang,Yongmook Kang
The waterborne biocompatible alkyd/polyaniline (WARA/PANI) coatings have gained a unique position in anticorrosion coating industry. However, the dispersion and compatibility between WARA and PANI still remain big challenge. Here copolymerization of aniline with aniline derivatives was adopted to prepare PANI, m-aminobenzenesulfonic acid-aniline (SPANI) copolymer, and SPANI copolymer end-capped with p-phenylenediamine (SPANIP terpolymer) aqueous dispersions. The chemical structure of PANI, SPANI and SPANIP was characterized by FT-IR spectra, XRD and UV–vis spectra. PANI displayed spherical particle morphology, while SPANI and SPANIP showed interconnected rod-like structure. The water dispersibility for SPANIP was significantly superior to that of PANI and SPANI, as well as the compatibility between SPANIP and WARA. The as-prepared SPANIP/WARA films also displayed enhanced thermal property and water resistance. The impedance modulus of SPANIP3/WARA coating increased by 4 orders in comparison with WARA coating, and increased by 2 orders compared with PANI/WARA and SPANI/WARA. In comparison with PANI/WARA, E corr of SPANIP/WARA shifted from -805 mV to -401 mV, I corr of SPANIP/WARA decreased by one order, and the corrosion inhibition efficiency increased from 73.8% to 94.3%. SPANIP/WARA coating was also endowed with improved long-term corrosion resistance, and the anticorrosion mechanisms were proposed.
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高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Shuangyu Xiong,Luminita Marin,Lian Duan,Xinjian Cheng
Nitroaromatic compounds, especially 2, 4, 6-trinitrophenol, have strong biological toxicity and explosive risks, so the detection of 2, 4, 6-trinitrophenol exhibit importantly practical and scientific significance. In this work, three fluorescence functionalized chitosan CNS 3 , CNS 4 and CNS 5 were prepared using chitosan as matrix. When 2, 4, 6-trinitrophenol (TNP) and/or p-nitrophenol (4-NP) was present in spot, these fluorescent chitosan sensors produced notable fluorescence quenching. It renders the chitosan sensing ability to detect TNP and 4-NP selectively and sensitively. The sensing mechanism is investigated as well. When introduced electron-rich moieties to the fluorescent chitosan, the sensitive detecting ability could be obtained. Excellent recognition ability could reach as low as 0.28 μM. The fluorescence fictionalization cause slight influence to the gel performance of chitosan.
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PubMed
高影响因子
VIBRATIONAL SPECTROSCOPY
·
2018
·
IF 1.363
Xiaofang Zhang,Weihua Lin,Haofei Zhao,Rongming Wang
Metallophthalocyanine (MPc) derivatives show excellent photoelectric and magnetic properties due to their large π-conjugate system. Central metals and peripheral substituents are two important ways to adjust and optimize the properties of MPc via tuning the large π-conjugate system. In this work, Raman scattering spectra of MPc, including ZnPc, CuPc, CoPc, and NiPc, were investigated. The most intense band in the Raman spectra at about 1500 cm −1 , owing to the vibration of C N C bridge bonds, shifts significantly with the size of the metal ion , indicating a good marker of metal ion effect on the changes of the Raman shift. For the MPc with suitable sizes of metal ions (e.g., Zn 2+ , Cu 2+ , Co 2+ , Ni 2+ ), the structure of phthalocyanine ring is planar. The ring will be distorted according to the different forces of the central metal ions. When the polarization force of the central metal ion enhances (Zn 2+ < Cu 2+ < Co 2+ < Ni 2+ ), the Raman shift of C N C would simultaneously increase, and the bigger polarization force could lead to a larger Raman shift (ZnPc < CuPc < CoPc < NiPc). On the other hand, the C N C Raman shift of the 3-substituted MPc was relatively smaller than that of the 4-substituted one with the same central metal ion. When the electron density of the phthalocyanine ring was relatively low, the energy of the system would increase and the Raman peak would correspondingly shift distinctly. Our Raman spectra results are consistent with the UV–vis measurement results. This work will provide the basis for structure analysis, and design of new molecular materials, as well as their application.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2018
·Vol. 22
·期 7
·1971-1981
·
IF 2.509
Gao Pingping,Xie Zhiyong,Ouyang Chun,Tao Tao,Wu Xiaobo,Huang Qizhong
The Ni-P/TiN/PTFE (poly tetra fluoroethylene) composite coatings were prepared by electroless plating method on Ti plate, which was used as bipolar plates of proton exchange membrane fuel cells (PEMFCs). The morphology, crystallographic texture, electrochemical corrosion, contact resistance, and hydrophobic property of the Ti bipolar plates with coatings were investigated. The results revealed that Ni-P/TiN/PTFE coating had a dense surface morphology, uniform distribution of composite particles. Ti with coating showed 0.48 μA cm 2 of corrosion current in the simulated solution of PEMFCs and 6 mΩ cm 2 of interfacial contact resistance (ICR). The hydrophobicity test showed that the coating interface was flat and the wetting angle was 112.4°. In conclusion, The Ni-P/TiN/PTFE composite coatings exhibit superior improvement in corrosion resistance, interface hydrophobicity, and conductivity to Ni-P, Ni-P/TiN, and Ni-P/PTFE coatings. The Ni-P/TiN/PTFE coating was suited for bipolar plate surface modification of bipolar plates.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 12
·8951-8962
·
IF 2.993
Wang Hongzhi,Zhou Haibin,Zhang Weiguo,Yao Suwei
Amorphous molybdenum sulfide on P-doped carbon nanotubes (MoS
x
/P-CNTs) composite with an original leaves–branch architecture for hydrogen evolution reaction (HER) is successfully fabricated by urea-assisted synthesis via a facile hydrothermal process. It is found that urea used in the process of preparation played a crucial role in the establishment of this unique structure, where leaves-like MoS
x
nanosheets are uniformly anchored on P-CNTs substrate. Besides, the optimal amount of MoS
x
on P-CNTs bundles is investigated in this paper. Due to the synergistic coupling effects of MoS
x
nanosheets and P-CNTs bundles, as a result, the unique structure maintains abundant active sites, a high electrical conductivity as well as distinctive electrons transport mechanism, which gives the optimum MoS
x
/P-CNTs composite, a higher activity for HER with an overpotential of 151 mV (vs. RHE) to reach a current density of 10 mA cm −2 and a smaller Tafel slope of 49 mV dec −1 . Stability tests indicate that the catalyst exhibits excellent electrochemical durability in 0.5 M H 2 SO 4 solution. We envision that this work could provide new insights into the rational design of MoS
x
-based electrocatalysts for energy conversion and storage.
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FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 5
·977-986
·
IF 1.353
Li Xiaolei,Chen Jun,Yang Chaofen
Highly selective polyether sulfone (PES) blend imprinted membranes for template p -hydroxybenzonic ( p -HB) were synthesized by phase inversion imprinting technique using polybenzimidazoles (PBI) as a functional polymer and nanosized Al 2 O 3 as the additives. The SEM analysis showed that cross-sectional morphology of membranes were strongly influenced by the content of nano-sized Al 2 O 3 . Compared with PES 1 -MIM, PES 2 -MIM and PES 4 -MIM, the PES 3 -MIM containing 2.0 wt.% nano-sized Al 2 O 3 exhibited higher membrane flux, kinetic equilibrium adsorption value, binding capacity and better selectivity for p -HB. The experimental data of adsorption kinetic were well fitted to the pseudo-secondorder kinetic model using multiple regression analysis. Static adsorption isotherm experiments exhibited that the PES 3 -MIM had the maximum adsorption capacity for p -HB. Moreover, selective experiment showed that the selectivity coefficients of PES 3 -MIM for p -HB relative to salicylic acid (SA) was 3.670, showing that PES 3 -MIM had excellent binding affinity and selectivity for separating p -HB form p -HB-contained aqueous solution.
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