Kooperativer Bibliotheksverbund

Berlin Brandenburg

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  • 1
    In: RSC Advances, 2014, Vol.4(18), pp.9292-9299
    Description: The cage-like mesoporous material SBA-16 has been successfully functionalized with l -4-hydroxyproline and characterized by Fourier transform infrared (FT-IR) spectroscopy, Small-angle X-ray powder diffraction (XRD), N 2 sorption detection, transmission electron microscopy (TEM), elemental analysis and thermo gravimetric analysis (TGA). This chiral non-metallic catalyst avoided heavy metal pollution during the preparing and using process, and demonstrated high catalytic activity (up to 91%), diastereoselectivity (up to 97:3) and enantioselectivity (up to 83%) in the asymmetric aldol reaction between aldehyde acceptors and ketone donors with methanolH 2 O as solvent. Moreover, the synthesized catalyst could be easily separated from the reaction mixture by filtration and reused for up to five runs without any obvious loss of activity, indicating its excellent recyclability.
    Keywords: Sorption ; Filtration ; Ketones ; Fourier Transforms ; Gravimetric Analysis ; Heavy Metals ; Microscopy ; Solvents ; Catalysts ; Aldehydes ; Spectroscopy ; General Pollution;
    ISSN: 2046-2069
    E-ISSN: 2046-2069
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  • 2
    In: RSC Advances, 2017, Vol.7(45), pp.28038-28047
    Description: The micro-mesoporous materials ZF- x (ZSM-5-FDU-12, x = SiO 2 /Al 2 O 3 ) with different molar ratios of SiO 2 /Al 2 O 3 were synthesized by an in situ nano-assembly method with the ZSM-5 precursor serving as the silica source. The physicochemical properties of the supports and the corresponding catalysts were analyzed in detail by various techniques including SEM, TEM, XRD, nitrogen physisorption, FTIR, UV-Vis, pyridine IR, Raman and XPS. The nitrogen physisorption measurement showed that the composite ZF-130 possessed excellent physical properties compared to other ZF- x materials. In addition, the XPS spectra displayed that catalysts NiMo/ZF- x showed a higher sulfurization than NiMo/FDU-12, and the NiMo/ZF-130 exhibited the highest contents of MoS 2 and NiMoS. In addition, DBT was employed as the probe molecule to evaluate the HDS (hydrodesulfurization) performance of the sulfide catalysts of NiMo/ZF- x under different weight hourly space velocities (WHSVs) 20120 h 1 , while NiMo/FDU-12 was used as the reference. Furthermore, the relationship between the structure of micro-mesoporous materials and the HDS activities of catalysts was systematically evaluated. The HDS efficiencies followed the order NiMo/ZF-130 〉 NiMo/ZF-110 〉 NiMo/ZF-150 〉 NiMo/ZF-90 〉 NiMo/ZF-70 〉 NiMo/FDU-12 under the operation conditions of 340 C, 4.0 MPa, and H 2 /oil of 200 20120 h 1 . Compared to other NiMo/ZF- x catalysts, NiMo/ZF-130 displayed the highest efficiency of DBT HDS, 96.3% at 20 h 1 , which could be attributed to the synergistic effects of its larger pore sizes (14.9 nm), greater specific surface area (352 m 2 g 1 ), moderate B and L acid sites, and the highest ratios of Mo 4+ /Mo (58%) and NiMoS/NiT (64%).
    ISSN: 2046-2069
    E-ISSN: 2046-2069
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  • 3
    In: RSC Advances, 2019, Vol.9(4), pp.1982-1989
    Description: Cisplatin is the most widely used anticancer drug, but its side effects limit the maximum systemic dose. To circumvent the side effects, a DNA tetrahedronaffibody nanoparticle was prepared by combination of a DNA chain with cisplatin via interstrand crosslinks or adducts. Each nanocarrier can bind 68 molecules of cisplatin. This cisplatin nanoparticle exhibited high selectivity and inhibition for breast cancer HER2 overexpressing cells BT474 and lower toxicity in MCF-7 cells with low HER2 expression. The nano-drug inhibited the growth of BT474 cells by 94.57% at 512 nM (containing 33.3 M cisplatin), which was higher than that of cisplatin (82.9%, 33.3 M).
    Keywords: Side Effects ; Chemotherapy ; Adducts ; Nanoparticles ; Cancer ; Deoxyribonucleic Acid–DNA ; Inhibition ; Nanoparticles ; Crosslinking ; Tetrahedrons ; Toxicity ; Breast Cancer ; Selectivity;
    ISSN: 2046-2069
    E-ISSN: 2046-2069
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  • 4
    In: RSC Advances, 2013, Vol.3(43), pp.20085-20090
    Description: Development of an efficient catalytic system for the dehydration of carbohydrates to produce 5-hydroxymethylfurfural (HMF), which is a platform molecule for biomass transformation, is a very attractive topic. In this work, three DBU-based ionic liquids (ILs) were prepared and used as the solvent for the conversion of carbohydrates into HMF. It was found that all these new ILs were excellent solvents for the dehydration of glucose, cellulose, fructose, sucrose, inulin, and cellobiose to form HMF using CrCl 3 6H 2 O as the catalyst. The effects of temperature, reaction time, catalyst amount, and substrate/solvent weight ratio on the dehydration of glucose in CrCl 3 6H 2 O/Bu-DBUCl were studied systematically. It was shown that the yield of HMF could reach 64% from glucose. In addition, the CrCl 3 6H 2 O/Bu-DBUCl system could be easily separated from the product, and could be reused five times without considerably decreasing in activity and selectivity.
    ISSN: 2046-2069
    E-ISSN: 2046-2069
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  • 5
    In: RSC Advances, 2018, Vol.8(69), pp.39769-39776
    Description: Lithium-rich transition-metal layered oxides (LROs), such as Li 1.2 Mn 0.6 Ni 0.2 O 2 , are promising cathode materials for application in Li-ion batteries, but the low initial coulombic efficiency, severe voltage fade and poor rate performance of the LROs restrict their commercial application. Herein, a self-standing Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene membrane was synthesized as a binder-free cathode for Li-ion batteries. Integrating the graphene membrane with Li 1.2 Mn 0.6 Ni 0.2 O 2 forming a Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene structure significantly increases the surface areas and pore volumes of the cathode, as well as the reversibility of oxygen redox during the chargedischarge process. The initial discharge capacity of the Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene membrane is 270 mA h g 1 (240 mA h g 1 for Li 1.2 Mn 0.6 Ni 0.2 O 2 ) and its initial coulombic efficiency is 90% (72% for Li 1.2 Mn 0.6 Ni 0.2 O 2 ) at a current density of 40 mA g 1 . The capacity retention of the Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene membrane remains at 88% at 40 mA g 1 after 80 cycles, and the rate performance is largely improved compared with that of the pristine Li 1.2 Mn 0.6 Ni 0.2 O 2 . The improved performance of the Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene membrane is ascribed to the lower charge-transfer resistance and solid electrolyte interphase resistance of the Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene membrane compared to that of Li 1.2 Mn 0.6 Ni 0.2 O 2 . Moreover, the lithium ion diffusion of the Li 1.2 Mn 0.6 Ni 0.2 O 2 /graphene membrane is enhanced by three orders of magnitude compared to that of Li 1.2 Mn 0.6 Ni 0.2 O 2 . This work may provide a new avenue to improve the electrochemical performance of LROs through tuning the oxygen redox progress during cycling.
    Keywords: Discharge ; Charge Transfer ; Solid Electrolytes ; Lithium-Ion Batteries ; Cathodes ; Transition Metals ; Electrochemical Analysis ; Graphene ; Electrode Materials ; Lithium ; Rechargeable Batteries ; Ion Diffusion ; Chemical Synthesis;
    ISSN: 2046-2069
    ISSN: RSC Advances
    E-ISSN: 2046-2069
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  • 6
    In: RSC Advances, 2015, Vol.5(102), pp.84290-84294
    Description: The binaphthol-derived phosphoric acid-promoted [3 + 3] cycloaddition of azomethine ylides with quinone monoimine has been achieved in the presence of 3 MS at room temperature, providing dihydrobenzoxazine derivatives in moderate to excellent yields.
    Keywords: Quinones ; Cycloaddition ; Derivatives ; Chemical and Electrochemical Properties (MD) ; Chemical and Electrochemical Properties (Ep) ; Chemical and Electrochemical Properties (Ed) ; Chemical and Electrochemical Properties (EC);
    ISSN: 2046-2069
    E-ISSN: 2046-2069
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  • 7
    In: RSC Advances, 2015, Vol.5(77), pp.62343-62347
    Description: A MePPh 2 -catalyzed [4 + 2] cycloaddition reaction of unsaturated pyrazolones with allenoates was described. The reaction affords the spiropyrazolone derivatives in moderate to excellent yields with moderate to good diastereoselectivities under mild conditions. Using thiourea-based bifunctional phosphines as chiral catalysts, an asymmetric variant of this [4 + 2] cycloaddition reaction has been achieved, giving chiral spiropyrazolone derivatives in moderate to excellent yields with moderate to excellent diastereoselectivities and excellent enantioselectivities (8995% ee).
    Keywords: Cycloaddition ; Pyrazolones ; Derivatives ; Phosphines ; Asymmetry ; Catalysts ; Unsaturated ; Catalysis ; Chemical and Electrochemical Properties (MD) ; Chemical and Electrochemical Properties (Ep) ; Chemical and Electrochemical Properties (Ed) ; Chemical and Electrochemical Properties (EC);
    ISSN: 2046-2069
    E-ISSN: 2046-2069
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  • 8
    In: RSC Advances, 2017, Vol.7(50), pp.31158-31163
    Description: The cathode interfacial layer (CIL) plays a vital role in enhancing the efficiency and lifetime performance of bulk heterojunction (BHJ) polymer solar cells (PSCs). Here, we compared the use of various organic semiconducting molecules, tris(8-hydroxyquinolinato) aluminum (Alq 3 ), bathocuproine (BCP) and 1,3,5-tri( m -pyrid-3-yl-phenyl)benzene (TmPyPB), as CILs in PSCs and analyzed their influence on device performance. Compared to the inorganic LiF CIL-based PSCs, significantly higher photovoltaic performance was observed by using these organic CILs in both PTB7:PC 71 BM and P3HT:PC 61 BM PSCs. Specifically, TmPyPB CIL-based devices exhibit superior device stability and high power conversion efficiency (PCE) up to 7.96%. A systematic study on the effects of Frontier orbital energy levels, surface morphology, and electron mobility of CILs suggests that a relatively coarse interface morphology would be helpful in the formation of high-density interfacial defect states for efficient electron extraction and a high mobility is of central importance in facilitating electron collection for high PCEs. Moreover, a synergistic effect between the inorganic LiF and organic molecules in the dual-CIL could contribute to the further enhancement of PSC efficiency (8.01%) and ambient stability. This work reveals fundamental principles in regulating the functions of CILs and would hopefully promote the investigation and development of ideal organic CILs for high-performance PSCs.
    ISSN: 2046-2069
    E-ISSN: 2046-2069
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  • 9
    In: RSC Advances, 2018, Vol.8(73), pp.41749-41755
    Description: Hierarchical structured porous NiMn 2 O 4 microspheres assembled with nanorods are synthesized through a simple hydrothermal method followed by calcination in air. As anode materials for lithium ion batteries (LIBs), the NiMn 2 O 4 microspheres exhibit a high specific capacity. The initial discharge capacity is 1126 mA h g 1 . After 1000 cycles, the NiMn 2 O 4 demonstrates a reversible capacity of 900 mA h g 1 at a current density of 500 mA g 1 . In particular, the porous NiMn 2 O 4 microspheres still could deliver a remarkable discharge capacity of 490 mA h g 1 even at a high current density of 2 A g 1 , indicating their potential application in Li-ion batteries. This excellent electrochemical performance is ascribed to the unique hierarchical porous structure which can provide sufficient contact for the transfer of Li + ion and area for the volume change of the electrolyte leading to enhanced Li + mobility.
    Keywords: Microspheres ; Lithium-Ion Batteries ; Discharge ; Structural Hierarchy ; Electrochemical Analysis ; Nanorods ; Self Assembly ; Electrode Materials ; Current Density ; Lithium ; Anodes ; Rechargeable Batteries;
    ISSN: 2046-2069
    ISSN: RSC Advances
    E-ISSN: 2046-2069
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  • 10
    In: RSC Advances, 2016, Vol.6(82), pp.79050-79057
    Description: Lithium-rich layered Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 cathode materials have been successfully fabricated by a glucose-assisted combustion method combined with a calcination treatment. The effect of the amount of glucose fuel on the properties of the prepared materials is investigated by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and electrochemical measurements. The results show that the nano-sized cathode material obtained at a fuel ratio of = 1 exhibits uniform fine well-crystallized particles with the largest specific surface area, leading to excellent cyclic capability and rate performance. It delivers the highest initial discharge capacity of 280.5 mA h g 1 with a capacity retention of 84% after 50 cycles at 0.1C (25 mA g 1 ). Besides, after cycling at an increasing rate from 0.2C to 3C, the electrode retained 90.3% (230.2 mA h g 1 ) of the initial discharge capacity when the rate was recovered back to 0.2C.
    Keywords: Discharge ; Cathodes ; X-Rays ; Fuels ; Combustion Synthesis ; Lithium-Ion Batteries ; Specific Surface ; Nanostructure ; Combustion ; Chemical and Electrochemical Properties (MD) ; Chemical and Electrochemical Properties (Ep) ; Chemical and Electrochemical Properties (Ed) ; Chemical and Electrochemical Properties (EC);
    ISSN: 2046-2069
    ISSN: RSC Advances
    E-ISSN: 2046-2069
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