COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Jingwen Song,Kai Ma,Tifeng Jiao,Ruirui Xing,Lexin Zhang,Jingxin Zhou,Qiuming Peng
Graphene oxide (GO)-based nanocomposite films via facile and appropriate self-assembly methods have demonstrated many potential applications in wide fields. This study demonstrates a facile and clean route to prepare graphene oxide-dye composite films using Langmuir-Blodgett (LB) technique at room temperature. By electrostatic interaction between cationic dye molecules and negatively charged GO sheets as well as π-π interactions, GO-dye composite LB films were formed spontaneously. As a soft platform for dye molecules, GO sheets induce dye molecules to self-assemble and form highly ordered structures containing H-aggregates and/or J-aggregates. The morphological characterization results show the formation of GO-dye composite films with smooth and dense surfaces. And the spectral results reveal that dye molecules stack in well-organized aggregates on the surface of GO sheets corresponding to monomers in bulk solution. The present research work about GO-dye composite films by LB method may provide new clues to prepare organized composite films and demonstrate potential applications in many fields.
研究领域:
材料科学
·
纳米科技
·
表面化学
·
胶体与界面科学
·
功能薄膜
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2019
·
IF 4.745
Shanjian Mao,Yinbo Wan,Haiyun Peng,Li Luo,Guisheng Deng
Pd(PPh3)2Cl2-catalyzed selective tandem cyclization/oxidation of available conjugated diazo ene-yne-ketones under O2 atmosphere led to the formation of diazo trisubstituted furans. The Rh2(OAc)4-mediated selective C(sp2)–H insertion at the ortho-position of 2-aryl group (R1) of the furan moiety under N2 atmosphere occurred to construct naphthalene cycle, affording trifunctionalized naphtho[1,2-b]furans. C(sp2)–H insertion at the 4-position of the furan ring, and Wolf rearrangement of diazo moiety have not been observed.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2015
·
IF 3.615
Sheng-Jie Chen,Yong-Qi Li,Peng Wang,Yong Lu,Xiao-Li Zhao,Ye Liu
Two kinds of novel zwitterionic phosphines of L1 and L2 have been synthesized in which the sulfonate groups (–SO 3 – ) are incorporated to render them amphiphilic. Both of them are strong π-acceptor ligands in which the positive-charged imidazoliums with intensive electron-withdrawing effect are vicinal to the coordinating phosphorous atoms. The amino-group of piperidyl is additionally incorporated in L2 to make it behave as a hybrid ligand with potential hemilability. The comparison of the ligands of L1 and L2 in Rh-catalyzed hydroformylation of styrene (and its derivatives) and the effect of water on their behaviors were discussed. Without the involvement of water, the catalytic system of Rh(acac)(CO) 2 - L2 exhibited lower activity than that of Rh(acac)(CO) 2 - L1 under the same conditions. However, the dramatic promotion effect of water as a suspension was observed especially for Rh(acac)(CO) 2 - L2 system with TOF spurred up from 195 to 470 h −1 . The corresponding in situ high pressure FT-IR spectral information showed that the presence of water in Rh(acac)(CO) 2 - L2 system greatly facilitated the formation and stability of the active Rh–H species ( ν Rh-H , 2047 cm −1 ), which was in charge of the efficient hydroformylation of styrene and its derivatives.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 5
·1258-1262
·
IF 2.726
Zhang Xingcong,Zhong Yunzhu,Chen Hongyu,Cheng Yujie,Sun Qingdi,Zhang Hao,He Qian,Zhang Ying,Guo Guanghui,He Xiaohui,Ji Hongbing
Through screening Ce precursors and pyrolysis temperatures [Ce(acac) 3 as Ce precursors and pyrolysis at 900 °C], zeolitic imidazolate framework-8(ZIF-8) derived nitrogen-doped carbon supported cerium single atom catalyst(Ce 1 /NC) is successfully prepared by ball milling method. The Ce 1 /NC catalyst exhibits exceptional catalytic performance in the selective oxidation of saturated C-H bonds in aromatic compounds, e.g. , 91% conversion and 99% selelctivity can be achieved in the oxidation of ethylbenzene to acetophenone under mild reaction conditions.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·Vol. 44
·期 4
·2379-2392
·
IF 11
Na Guo-Quan,Cui Wen-Gang,Shi Hang-Yan,Li Zheng-Long,Gao Fan,Wang Xing-Qiang,Wang Ke,Gao Yong,Yang Ya-Xiong,Shen Zi-Chao,Pan Hong-Ge
High-capacity LiBH 4 is a promising solid hydrogen storage material. However, the large electron cloud density between the B-H bonds in LiBH 4 induces high dehydrogenation temperatures and sluggish dehydrogenation kinetics. To solve the above problems, it is proposed to enhance the hydrogen storage properties of LiBH 4 through the synergistic effect of Brønsted and Lewis acid in Hβ zeolite. Composite hydrogen storage systems with different mass ratios were prepared by simple ball-milling. At a LiBH 4 -to-Hβ mass ratio of 6:4, the 6LiBH 4 -4Hβ system released hydrogen at 190 °C and achieved a hydrogen release capacity of 7.0 wt% H 2 upon heating to 400 °C. More importantly, the hydrogen release capacity of the system reached 6.02 wt% at 350 °C under isothermal conditions after 100 min and 7.2 wt% at 400 °C under isothermal conditions after 80 min, whereas the pristine LiBH 4 only achieved 2.2 wt%. The improvement in hydrogen storage performance of the system was mainly attributed to two factors: (i) Lewis acid sites with acceptable electrons in the Hβ weaken the electron density of B–H bonds in LiBH 4 , and (ii) the H + proton from the Brønsted acid sites and H − of LiBH 4 undergo a H + + H − = H 2 reaction. Theoretical calculations revealed that the Lewis and Brønsted acid sites in the Hβ zeolite are conducive to the weakening of B – H bonds and that storage charge transfer occurs near the Lewis acid sites. The present work provides new insights into improving the hydrogen storage performance of LiBH 4 by weakening the B–H bonds in the LiBH 4 .
研究领域:
能源存储
·
催化
·
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2014
·
IF 2.349
Fafu Yang,Jin Yuan,Congcong Li,Hongyu Guo,Xiaoyun Yan
Series of triphenylene derivatives with multiple NH groups 3a, 3b, 4a, 4b, 5a and 5b were designed and synthesised by simple procedures in high yields. Their structures were confirmed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), mass spectrometry (MS) and elemental analysis. Their mesophase behaviours were studied by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. The triphenylene derivatives 3a and 3b with two NH groups and triphenylene derivatives 4a and 4b with three NH groups possess excellent mesomorphic properties. Compounds 4a and 4b exhibited wider mesophase than compounds 3a and 3b. Triphenylene derivatives 5a and 5b with five NH groups have no mesomorphic properties. These results suggested the units of hydrogen bonds played the crucial roles on mesomorphic properties and acylthiosemicarbazide group with three NH groups was a good functional group for producing excellent mesomorphic properties.
研究领域:
材料化学
·
物理化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Fei Gao,Jiancheng Cao,Qibo Wang,Ren Liu,Shengwen Zhang,Jingcheng Liu,Xiaoya Liu
A series of ultraviolet (UV)-curable self-healing polyurethane (PU) oligomers were synthesized by incorporating different contents of 2-ureido-4[1H]-pyrimidone and polycarbonate diols (PCDL) with different molecular weights at the end of PU chains. The structure of the oligomers were determined through Nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared spectroscopy. The PU oligomers were used to produce UV-curable self-healing coatings, the properties of which were investigated and the properties of the coatings with different functionality were studied. The results revealed that the performance of the coating was higher when a higher molecular weight of PCDL was used and With functionality increasing, the crosslinking density of the coating ascends, resulting in higher self-healing temperature and upper pendulum hardness and gloss of the coating. To balance the self-healing ability and mechanical properties of the coating, a series of coating formulations were designed by adding different types and amounts of active diluents. Double bond conversion, thermostability, and self-healing ability were investigated to determine the effect of active diluents on coating performance. The results demonstrated that the resultant coating have excellent adhesion, gloss, and thermostability. Coatings prepared used all types of active diluents had favorable self-healing ability, except for that prepared using 2-acryloyloxymethyl-2-ethyltrimethylene diacrylate. Excellent self-healing and mechanical properties were obtained when 20 w.t.% of triethoxylated trimethylolpropane triacrylate was used.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Hongyi Shi,Weiqu Liu,Chunhua Liu,Maiping Yang,Yankun Xie,Shuo Wang,Fengyuan Zhang,Liyan Liang,Ke Pi
Herein, h-BN powders were sonicated in an aqueous solution of polyethylenimine (PEI) to simultaneously exfoliate and functionalize h-BN nanosheets with Lewis acid-base interaction. The structure and morphology of PEI modified h-BN nanosheets (PEI-BNNSs) were characterized by FTIR, TGA, AFM and TEM. The as-prepared PEI-BNNSs were served as anticorrosive nanofillers for waterborne epoxy (EP) coatings on Q235 carbon steel. The corrosion behaviors of EP and PEI-BNNSs/EP coating systems in 3.5 wt % NaCl aqueous solution were evaluated by electrochemical workstation. It is worth noting that the protection efficiency (PE) values of 1 wt % PEI-BNNSs/EP and 2 wt % PEI-BNNSs/EP coating systems are as high as 99.99 % compared to EP coating systems. Moreover, the impedance modulus (|Z| f = 0.01 Hz ) of the 1 wt % PEI-BNNSs/EP coating system was 3–4 orders of magnitude higher than the EP coating after 90 days of immersion. The electrochemical results revealed that PEI-BNNSs can significantly enhanced the corrosion resistance of waterborne epoxy coatings.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Qu Tang,Xiaobo Zhou,JinXia Liu,Mingmin Wu,Haiwei Ji,Qi Wang,Guo Li,Hui Cong,Yuling Qin
The use of Formic acid as an alternative to fossil fuels is promising, both from economical and ecological standpoints, and has received great of attention owing to its inherently superiority in recent decades. Nevertheless, efficient and low-cost solid catalyst for formic acid dehydrogenation at room temperature still constitutes a biggish challenge. Moreover, comparing to increase the catalytic performance of catalysts, very little attention payed to the kinetic mechanism of dehydrogenation reaction because of the lack of effective characterization artifice. Here, the as-prepared Ni@Pd nanoparticles by a sequential reduction process can be useful catalyst for formic acid decomposition at room temperature without a promoter. Thanks to the effective catalyst and isotope distribution technique, preliminary mechanistic results firstly reveal that hydrogen is obtained via a H-atom recombination on isolated sites after the proton exchange randomly between activated H and solvent.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
DOI
高影响因子
CURRENT PHARMACEUTICAL DESIGN
·
2022
·Vol. 28
·期 9
·743-750
·
IF 3.31
Ning Zhouyu,Yang Lina,Yan Xia,Wang Dan,Hua Yongqiang,Shi Weidong,Lin Junhua,Meng Zhiqiang
Background: To investigate the effects of the Lenvatinib@H-MnO2-FA administration system on the proliferation and apoptosis of Intrahepatic cholangiocarcinoma (ICC) and the underlying molecular mechanism. Materials and Methods: In this research, hollow MnO2
(H-MnO2) was synthesized via the modified Stöber method, and H-MnO2 was modified with polyethylene glycol-bis (Amine) (NH2-PEG-NH2) and folic acid (FA) to obtain H-MnO2-PEG-FA (H-MnO2-FA).
Lenvatinib was coated in the hollow cavity of H-MnO2-PEG-FA to further form a nanometre drug-carrying system (Lenvatinib@H-MnO2-PEG-FA). Lenvatinib@H-MnO2-FA was characterized through transmission electron microscopy (TEM)
and scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FT-IR) was used to verify that Lenvatinib was loaded on nanoparticles. Functionally, confocal laser scanning microscopy (CLSM), 2-(4-Amidinophenyl)-6-indolecarbamidine dihydrochloride (DAPI) staining, and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium
bromide (MTT) assay were performed to determine the effect of Lenvatinib@H-MnO2-FA on the proliferation and apoptosis of ICC cells (9810 cells). Finally, the protein levels of Raf-1MEK1/2-ERK1/2 signalling pathway components were detected through Western blotting analysis.
Results: We successfully synthesised a Lenvatinib@H-MnO2-PEG-FA administration system. The resulting nanomaterials had excellent biological stability and improved targeting effects. Functionally, Lenvatinib@ H-MnO2-FA inhibited the proliferation
of 9810 cells. The Bcl-2 protein level was significantly downregulated, and the caspase-3 protein level was significantly upregulated, indicating that Lenvatinib@H-MnO2- PEG- FA promoted the apoptosis of 9810 cells. Mechanistically, Lenvatinib@H-MnO2-FA
increased the phosphorylation levels of Raf, MEK1/2, and ERK1/2. Conclusion: H-MnO2-FA can more effectively deliver Lenvatinib to inhibit proliferation and promote apoptosis in ICC, which could be the promising drug delivery nano-vehicles for delivery drugs.
研究领域:
药理学
·
肿瘤学
·
纳米技术
·
细胞生物学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Runduo Teng,Changhao Feng,Yanting Wang,Wenjun Tu,Tianyu Lan,Qiyuan Fu,Jingyu Long
N-butanol is widely used in fields such as chemical engineering and pharmaceutical synthesis; therefore, trace-level, highly sensitive detection of n-butanol is of great significance. In this study, an n-butanol gas sensor based on silver (Ag)-decorated yttrium ferrite (YFeO 3 ) nanotubes was fabricated using the electrospinning followed by the impregnation method. Compared with the pure YFeO 3 , the Ag-decorated YFeO 3 nanotubes exhibited an enhanced response of 162.06 toward 10 ppm n-butanol. This remarkable gas-sensing performance is primarily attributed to the synergistic effects of the mixed-valence states of iron, abundant surface oxygen vacancies, and the Ag spillover effect. Moreover, it exhibits excellent long-term stability and a detection limit as low as 76.5 ppb. These results indicate that Ag-decorated YFeO 3 nanotubes hold significant potential for trace n-butanol detection.
✓ 已验证
产品关联
DOI
高影响因子
Nature Catalysis
·
2026
·
IF 48.3
Ding Liang,Yao Ze-Cheng,Tang Tang,Wan Xin,Liu Xiaozhi,Jiang Zhe,Fu Jiaju,Shi Zhuo-Qi,Tai Jing,Lyu Zhen-Hua,Dong Jichen,Li Qing,Su Dong,Shui Jianglan,Hu Jin-Song,Wan Li-Jun
High-performance cathode catalysts are essential for proton-exchange membrane fuel cells. Intermetallic nanocrystals are promising candidates but suffer from intrinsic activity–durability trade-offs because their comprehensive catalytic properties are determined by several intertwined structural factors that cannot be optimized independently by existing synthesis techniques. The challenge lies in the inherent thermodynamic and kinetic constraints during synthesis. Here we develop a decoupled synthesis strategy that leverages block-copolymer micelle confinement, which enables the customized synthesis of libraries of intermetallic nanocrystals, simultaneously achieving ultra-small size, ultra-high ordering degree, tailorable loading density, narrow size distribution, compositional uniformity, and broad compositional and substrate universality. The developed Pt 3 Co intermetallic nanocrystal/Ketjenblack catalyst achieves a rated power density of 1.08 W cm −2 and 92% rated power retention after 30,000 cycles under light-duty-vehicle conditions and 900 h of stable operation at 10 A. It also delivered a 70.2% cell efficiency without degradation and 98.4% specific power retention after 90,000 cycles of heavy-duty-vehicle applications. This performance led us to project a lifetime of 240,000 h.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）