ACS Applied Nano Materials
·
2019
·
IF 0
Hongxiang Zhang,Chunxia Wu,Canran Zhang,Bisheng Yan,Jiyuan Guo,Gangyi Zhu,Jun Dai
In this paper, we report the dual-wavelength green-light emission from zinc oxide (ZnO)-nanoseed-decorated p-GaN (gallium nitride)/n-ZnO nanorod/CsPbBr3 quantum dots (QDs) light-emitting diodes (LEDs). At the same time, the effect of ZnO nanoseeds on the p-GaN/n-ZnO nanorod/CsPbBr3 QDs LED performance is deeply studied. ZnO nanoseeds were fabricated by magnetron sputtering and the sol–gel method; then ZnO nanorods were obtained on GaN by hydrothermal treatment to form the p-GaN/n-ZnO nanorod heterojunction, and green CsPbBr3 QDs were further deposited on ZnO nanorod arrays to realize LEDs. The results show that magnetron-sputtering ZnO nanoseeds can induce regular vertical ZnO nanorod arrays, and the corresponding device presents a better electroluminescence (EL) performance. The X-ray diffraction, atomic force microscopy, and EL mechanisms indicate that the p-GaN/n-ZnO nanorod with magnetron-sputtering ZnO nanoseeds has a better crystalline interface. Our results indicate that the p-GaN/n-ZnO nanorod/CsPbBr3 QDs heterojunction structure can be served as dual-wavelength LEDs, and magnetron-sputtering ZnO nanoseeds can give rise to a better EL performance.
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CELLULOSE
·
2019
·Vol. 27
·期 3
·1745-1761
·
IF 3.917
Wan Caiyan,Liu Mingsheng,Tian Peixiu,Zhang Guangxian,Zhang Fengxiu
Abstract A bio-based P–N synergistic flame retardant ammonium salt of d -Panthenol-tri (methylphosphonic acid) (ADPTMPA) was synthesized using a formaldehyde-free and solvent-free strategy for the highly efficient preparation of durable flame-retardant cotton. The ADPTMPA structure was verified by 1 H NMR, 13 C NMR and 31 P NMR. FT-IR test revealed successful grafting of the flame retardant onto the cotton through P–O–C covalent bonding. The morphologies and structures of pure cotton and treated cotton were characterized by SEM and XRD, and the elemental compositions of cotton samples were analyzed by EDX. Volatile pyrolysis products of treated cotton were analyzed by TG-IR. Flame retardancy and washability of treated cotton were analyzed by limiting oxygen index (LOI) and vertical flammability tests (VFT). The LOIs of 40 wt% ADPTMPA treated cotton before and after 50 laundering cycles was determined as 46.5% and 35.8%, respectively. VFT showed the treated cotton exhibited no smoldering and continuous burning. All carbon lengths of treated cottons were less than 60 mm. The heat release rate and total heat release of treated cotton were decreased by 91.34% and 58.01% compared with pure cotton, respectively. There was 29.42 wt% carbon residual remaining when the treated cotton was exposed to heat flow of 35 kw/m 2 . The treated cotton exhibited excellent flame retardancy and washability. Additionally, the mechanical properties and whiteness of the treated cotton were well-maintained. Graphic abstract
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高影响因子
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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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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PubMed
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 9
·1661
·
IF 3.06
Mengmeng Xia,Yajing Fang,Weiwei Cao,Fuqiang Liang,Siyi Pan,Xiaoyun Xu
P-glycoprotein (P-gp) serves as a therapeutic target for the development of inhibitors to overcome multidrug resistance (MDR) in cancer cells. In order to enhance the uptake of chemotherapy drugs, larger amounts of P-gp inhibitors are required. Besides several chemically synthesized P-gp inhibitors, flavonoids as P-gp inhibitors are being investigated, with their advantages including abundance in our daily diet and a low toxicity. The cytotoxicity of daunorubicin (as a substrate of P-gp) to KB/MDR1 cells and the parental KB cells was measured in the presence or absence of flavonoids. A two-dimensional quantitative structure–activity relationship (2D-QSAR) model was built with a high cross-validation coefficient (Q2) value of 0.829. Descriptors including vsurf_DW23, E_sol, Dipole and vsurf_G were determined to be related to the inhibitory activity of flavonoids. The lack of 2,3-double bond, 3′-OH, 4′-OH and the increased number of methoxylated substitutions were shown to be beneficial for the inhibition of P-gp. These results are important for the screening of flavonoids for inhibitory activity on P-gp.Keywords:flavonoids;P-gp;inhibitory activity;QSAR
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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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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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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Yu Ji,Tengda Zhang,Xia Gui,HaiJian Shi,Zhi Yun
The ketalization of glycerol with acetone was conducted over an ionic liquid [P(C 4 H 9 ) 3 C 14 H 29 ][TsO] (TTPT) in a batch reactor. A scheme to obtain the purified product using TTPT as a homogeneous catalyst is proposed and a maximum solketal yield of 86% is achieved at acetone/glycerol molar ratio of 6/1, reaction time of 0.5 h, reaction temperature of 303 K, catalyst amount of 5 wt% of glycerol. TTPT was recycled and reused for ten times without obvious losses in terms of quantity and activity. Furthermore, effects of various experimental parameters (stirring speed, catalyst loadings, temperature and reactant composition) on the reaction kinetics are investigated. In terms of kinetics modeling, K γ is fitted by reactant composition at the temperature range 298 K–323 K, which was a concise strategy that showed good precision in the kinetics fitting. The activation energy for this ketalization reaction was evaluated to be 28.2 kJ·mol −1 . In addition, the kinetics of the reaction at a temperature exceeding the boiling point of acetone were also studied. We believe that all the results are important for further development of a technology for the continuous synthesis of solketal.
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高影响因子
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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高影响因子
Advanced Electronic Materials
·
2018
·Vol. 4
·期 11
·1800237
·
IF 5.466
Xin Wang,Yao Wu,Guanwen Li,Jun Wu,XiaoBing Zhang,Qing Li,Baoping Wang,Jing Chen,Wei Lei
Organometallic perovskites are candidates for low-dose ionizing radiation due to their large mobility-lifetime product, large radiation absorption coefficient, high stability at ambient temperature, and ability to crystallize from solution at low temperatures. However, multiple unstable and expansive organic layers are required to block injected charges from the applied voltage. Here, a radiation photodiode based on p–n junctions formed in the CH 3 NH 3 PbI 3 crystallization process without any other organic layers is reported. Through controlling the location of the dopant, selenium (Se), and its concentration inside CH 3 NH 3 PbI 3 single crystals, the valence band offset of the band alignment is measured as 0 to 0.45 eV. The photodiodes require only two gold electrodes deposited on opposite faces of the CH 3 NH 3 PbI 3 single crystals, and the sensitivity for 60 keV X-ray and 1.25 MeV gamma-ray from Cobalt-60 reached 21 µC mGy air cm −2 and 41 µC Gy air cm −2 , respectively. Experiments measured the ultrafast response time to be 3 µs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Ling Cheng,Yulu Tian,Jingdong Zhang
A p-n heterojunction film of Cu 2 O/α-Fe 2 O 3 was constructed by electrodepositing p-type Cu 2 O microcubes on liquid phase deposited film of n-type α-Fe 2 O 3 . The surface morphology , the crystal phase and composition of Cu 2 O/α-Fe 2 O 3 heterojunction film were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The enhanced absorption in the visible light region was observed in UV–visible diffuse reflectance spectra. Meanwhile, an efficiently improved separation and faster transfer of photogenerated electrons and holes were revealed by photoluminescence spectra and electrochemical impedance spectra. The Cu 2 O/α-Fe 2 O 3 p-n heterojunction was applied to photoelectrocatalytic degradation of oxytetracycline at a bias potential of +0.5 V under visible light illumination. After 60-min photoelectrocatalytic treatment, 73.3% of oxytetracycline was removed and the degradation rate constant reached 2.14 × 10 −2 min −1 . Moreover, the crystal phases and compositions for the used and fresh Cu 2 O/α-Fe 2 O 3 films were studied, and a possible photoelectrocatalytic mechanism was proposed.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Alam Venugopal Narendra Kumar,Yinghao Li,Hongjie Yu,Shuli Yin,Hairong Xue,You Xu,Xiaonian Li,Hongjing Wang,Liang Wang
It is essential to design an oxygen evolution reaction (OER) electrocatalyst with smaller overpotential to improve water electrolyzer efficiency. Here, we report a simple method to incorporate nickel hexacyanoferrate into the three-dimensional (3D) graphene aerogel (GA) structure (NiHCF/GA), through which we have derived OER active FeNi-P/GA catalyst by heating with the phosphide source. Structural characterization data disclosed that the NiHCF derived FeNi-P particles were uniformly distributed in the 3D GA network. The obtained FeNi-P/GA catalyst exhibits precursor ([K 3 Fe(CN) 6 ] and NiCl 2 ) concentration-dependent electrocatalytic activity towards OER. Linear sweep voltammetry (LSV) study shows OER on the optimized FeNi-P/GA catalyst surface commenced at 1.46 V vs . RHE and demands only 280 mV overpotential to achieve the benchmark current density of 10 mA.cm −2 . Also, the FeNi-P/GA catalyst displayed a Tafel slope of 43 mV.dec −1 , suggesting its superior OER performance in alkaline condition.
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