APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 7
·1-7
·
IF 1.81
Li Peipei,Peng Xinsheng
Au–Cu bimetallic nanomaterials have attracted tremendous attention in the field of catalysis, water splitting, biosensor and biotherapy. Au 3 Cu nanocrystals with a definite stoichiometric ratio and ordered arrangement of atoms have shown great potential for efficient catalyts. Herein, we reported a new method for fabrication of Au 3 Cu nanocrystals. Their morphologies can be tuned by the amount of hydrochloric aqueous solution, including nanosquare and frame were achieved, respectively. The as-synthesized Au 3 Cu nanosquares not only demonstrated a comparatively high sensitivity of 324.8 μA mM −1 cm −2 as a non-enzymatic glucose sensor but also performed well in CO catalytic oxidation even at 50 °C with a conversion efficiency of 30 mmol g −1 h −1 .
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Yuan Deng,Jianyong Wei,Junlu Sun,Yanan Zhang,Lin Dong,Chong-Xin Shan
Mechanoluminescent materials that could convert mechanical energy into light energy have attracted increasing attention in recent years for their wide potential applications in stress sensing and imaging, structural damage monitoring, wearable illuminating devices, self-powered display, mechanical energy collection and conversion. However, their relatively low mechanoluminescence intensity greatly hinders the practical application. Here, we present a simple and effective strategy to enhance the mechanoluminescence performance of ZnS :Mn phosphor by Li ion co-doping. ZnS:Mn,Li phosphors of the hexagonal wurtzite structure have been prepared via high temperature solid phase sintering . The PL and ML intensity have been enhanced by 338% and 610% for samples obtained when 4 and 5 at. % Li is introduced in the precursor materials, respectively, in comparison with those without Li dopant . The photoluminescence lifetime of ZnS:Mn,Li decreases gradually, indicating the enhanced non-radiative energy transfer as the Li concentration increases. The electron paramagnetic resonance spectroscopy is carried out to investigate the changing tendency of the sulfur vacancy of samples with various Li-doping concentration. The mechanism for mechanoluminescence enhancement is supposed to be correlated with the increased sulfur vacancies by Li co-doping, which may facilitates the non-radiative energy transfer and thereby improve the luminescence properties of the samples. These findings provide a feasible strategy to enhance the mechanoluminescence performance of traditional ZnS derived phosphors, and may contribute to developing novel mechanoluminescence materials for practical applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Deng Ding,Zhuo Jiang,Dong Ji,Myung Nosang Vincent,Ling Zan
To enhance the photocatalytic activity, co-catalysts are often utilized to accelerate rate-limited surface reactions. Herein, various amounts of bismuth oxyselenide (Bi 2 O 2 Se) ( i.e. , 5 to 25 wt%) as a novel co-catalyst were deposited on TiO 2 nanoparticles for photocatalytic hydrogen evolution reaction. The 15% Bi 2 O 2 Se/TiO 2 showed the best enhanced hydrogen production rate of 1240.7 μmol h −1 g −1 , which was about 50 times greater than that of pure TiO 2 . The SEM, EDX-Mapping and TEM revealed the mechanism of in-growth of Bi 2 O 2 Se on the TiO 2. Trapping experiment of superoxide free radical (O 2 − ) and transient photocurrent decay measurement also revealed that the recombination of the photogenerated electron–hole was remarkably suppressed in Bi 2 O 2 Se/TiO 2 compared to pure TiO 2 . Detailed analysis of XPS, transient photocurrent responses, electrochemical impedance spectroscopy (EIS) and DFT calculations indicated that there is a strong interaction between Bi 2 O 2 Se and TiO 2 , and the electrons of TiO 2 can be injected into Bi 2 O 2 Se. These findings show the potential of Bi 2 O 2 Se as co-catalytic materials and open a new avenue for solar water splitting.
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OPTIK
·
2021
·
IF 2.443
Kai Ye,Xiaoliang Yang,Siguo Xiao
Bi 3+ , Mn 2+ co-doped CaZnGe 2 O 6 red long afterglow materials were prepared by high temperature solid state reaction method. The phosphor has broad excitation band ranging from 220 nm to 350 nm with two peaks at 255 nm and 300 nm and can give blue, green and red emission band peaking at 448 nm, 530 nm and 645 nm, respectively. Due to the emission properties of Bi 3+ ions and the Bi 3+ →Mn 2+ energy transfer, the co-doped Bi 3+ ions can not only enhance the PL luminescence of the phosphor, but also adjust the emission color. After irradiation of 300 nm ultraviolet light , the phosphors exhibits long-persistent red phosphorescence. Thermoluminescence tests demonstrate that the introduction of Bi 3+ ions can increase the trap depth and trap concentration, greatly improving the afterglow time and brightness of the CaZnGe 2 O 6 : Mn 2+ phosphor. The present work might provide reference for designing new rare earth free red long afterglow materials.
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高影响因子
ACS Applied Bio Materials
·
2019
·
IF 0
Jiantao Yu,Jing Li,Shiyao Zhai,Li Lin,Kui Wang,Bin Tang,Hong Meng,Leilei Tian
Polymerization of small interfering RNA (siRNA) has been demonstrated as a promising strategy to improve siRNA delivery, which will change the low-charge and rigid properties of single siRNA and enhance its electrostatic interactions with cationic polymers. For such polymerization strategy, a major breakthrough is still needed to fully eliminate chemical processes and further improve the nanocomplex-forming ability of polymerized siRNAs. Herein, the extremely strong interaction between the DNA product of rolling circle amplification (RCA) and linear poly(ether imide) (PEI) has been disclosed; accordingly, a stable nanocomplex is formed just at its charge neutralization point, which benefits from the high molecular weight of the RCA product (>3 000 000 Da). In addition, as the sequence of the RCA product is determined by the cyclic template, the programmable nature of DNA can simplify the optimization process and maximize the hybridization efficiency between RCA and sticky siRNAs, realizing a superior siRNA polymerization efficiency. Depending on these two effects, the RCA DNA is utilized as a cocarrier material to organize siRNA polymerization and substantially reduce the usage amount of PEI, which greatly improves RNAi efficiency of PEI/RCA-siRNA polyplex both in vitro and in vivo, providing evidence that RCA DNA is a promising material to promote the RNAi-based therapeutics.
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PubMed
RSC Advances
·
2019
·Vol. 9
·期 20
·11476-11483
·
IF 3.049
Dezhi Qu,Shuai Sun,Hongwei Gao,Yongping Bai,Ying Tang
We modified poly(butylene succinate) (PBS) with sugar-based monomer isosorbide to improve the bond strength between PBS and metal interfaces and thereby alleviate the environmental problems caused by nondegradable hot-melt adhesives. We analyzed the efficiency of different catalysts in the synthesis of poly(butylene-co-isosorbide succinate) (PBIS) copolyesters. The thermal stability, thermodynamic characteristics, and melting viscosity of PBIS copolyesters were systematically evaluated by characterization. The results indicate that isosorbide can greatly improve the bond strength of the interface between PBS and the iron plate when copolyesters are used as hot-melt adhesives.
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高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 11
·2915-2922
·
IF 5.726
Qing Zhang,Jinhao Zhang,Huawei Yang,Yilin Dong,Yu Liu,Lixia Yang,Donglei Wei,Wenxiang Wang,Liangjiu Bai,Hou Chen
In this work, CoMo bimetallic oxides were prepared and proposed as catalysts for aerobic oxidative desulfurization (AODS) of fuels with oxygen in air as the oxidant. The bimetallic oxides could efficiently catalyze the oxidation of a series of thiophenic compounds at 80–120 °C and atmospheric pressure, while the neat Co or Mo oxide didn't show any catalytic ability, which directly proved the synergistic effect of Co and Mo. In the bimetallic system, the Co(II) sites could exhibit the capability to activate oxygen, while the Mo(IV) sites were suspected to directly participate in the oxidation of sulfides by forming reactive species. As is clearly evidenced by the characterization and experimental results, with the variation of Co/Mo proportion (2 : 1, 1 : 1 and 1 : 2), the bimetallic oxides possessed different electronic structures and surface compositions, which further led to their distinct catalytic performances. When the Co/Mo ratio was 2 : 1, the best performance was obtained, and some important reaction parameters were investigated. Furthermore, the catalyst could be reused for at least five cycles without changes in catalytic performance and chemical structure. Based on these results, it is expected that the CoMo bimetallic oxides may serve as an efficient, separable and recyclable catalyst for AODS of fuels.
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OPTIK
·
2019
·
IF 1.914
Yulin Shi,Yudong Xu,Wenjie Hu,Lei Wang,Ruliang Liu,Heni Wang,Caiyue Zhao,Xinyi Chen,Min Shi
In this article, the authors prepared CaMgAl 10 O 17 : Sm 3+ , CaMgAl 10 O 17 : Eu 3+ and CaMgAl 10 O 17 : Sm 3+ , Eu 3+ phosphors via high temperature solid-state reaction and studied the phase constituents and photoluminescence (PL) of the phosphors as-synthesized. The main emission peaks of CaMgAl 10 O 17 : Sm 3+ at 559 nm, 590 nm and 639 nm are due to 4 G 5/3 → 6 H 5/2 , 4 G 5/3 → 6 H 7/2 and 4 G 5/3 → 6 H 9/2 transitions of Sm 3+ activator, respectively. The optimum doping concentration of Sm 3+ in CaMgAl 10 O 17 is 3 mol. %. The main emissions of CaMgAl 10 O 17 : Eu 3+ peaked at 586 nm and 610 nm belong to 5 D 0 → 7 F J (J = 1, 2) transitions of Eu 3+ activator. When Eu 3+ ions are added into CaMgAl 10 O 17 : 0.03 Sm 3+ phosphors, an energy transfer between Sm 3+ and Eu 3+ via an electrical multipole interaction occurs, and the emission intensity of CaMgAl 10 O 17 : 0.03 Sm 3+ , Eu 3+ phosphors is greatly improved.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 31
·46578
·
IF 1.901
Dan Lv,Abdul Qadeer Dayo,An-Ran Wang,Sadia Kiran,Yi-Le Xu,Sha Song,Wen-bin Liu,Jun Wang,Bao-Chang Gao
A new high-performance copolymer was successfully obtained via concerted catalysis polymerization of mono-functional benzoxazine (P-a) and self-promoted 4-aminophenoxy phthalonitrile (4-APN) monomers. The FTIR and DSC curves of the P-a/4-APN in different blend ratios suggested that the monomer blends can be completely cured without the addition of curing additive. The P-a/4-APN copolymers were cured at relatively lower curing temperatures and time. The TGA curves revealed that the P-a/4-APN copolymers have good thermal stability in terms of T 5 , T 10 , and char yield. A gradual increase in the glass transition temperature ( T g ) values and decline were seen in the storage modulus as the loading of 4-APN was increased from 10 to 30 wt % in the copolymer. The SEM analyses showed that copolymer's fracture surface is dendritic, showing the stress has been dispersed to a certain extent. The study revealed that the poly(P-a/4-APN) copolymer have much better thermal stabilities than the poly(P-a), and the prepared copolymer can be used as a high-performance thermosetting resin. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46578.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Kehan Liang,Chang Ma,Lei Liu,Yifeng Yu,Haijun Lv,Yue Zhang,Aibing Chen
Multi-element doped mesoporous carbon materials are considered as one of the most promising electrode materials for supercapacitors due to their large specific surface area, abundant mesoporous structure, heteroatom doping and good conductivity. Herein, the N, O co-doped ordered mesoporous carbon (N/O-OMC) were successfully prepared by the solid-solid grinding method using KIT-6 as template, Fe(NO 3 ) 3 as catalyst, and polyvinylpyrrolidone (PVP) as source of C, N, and O. The effect of PVP amount on the structural parameters of the sample was also discussed. The resulting N/O-OMC replicated the morphology of KIT-6 and showed suitable N and O doping, a large specific surface area and an ordered dual-mesoporous structure. As the electrode materials, N/O-OMC exhibit excellent specific capacitance of 229 F g −1 at 1 A g −1 , excellent rate performance (79.5%) and cycle stability (92.3% after 5000 cycles). This multi-element doped mesoporous carbon material was proved a good candidate for high-performance electrode materials.
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Crystals
·
2018
·Vol. 8
·期 9
·336
·
IF 2.144
Muhammad Inam,Jiajia Wu,Jie Shen,Chi Uyen Phan,Guping Tang,Xiurong Hu
Two new co-crystals, Ticagrelor with Nicotinamide, have been prepared with improved solubility. Because Ticalegor has a poor solubility and dissolution rate, a novel co-crystallization method with structurally homogenous crystalline material, an active pharmaceutical ingredient (API), and co-former indefinite stoichiometric amount has been made to improve Ticagrelor’s solubility. The co-crystal of Ticagrelor (TICA) with Nicotinamide (NCA) was prepared in ratio (1:1) and confirmed by FTIR, DSC, and XRD characterization. Furthermore, the single crystal structure of TICA-NCA hydrate was analyzed. The solubility of co-crystals was investigated in pH 2 acidic medium, which was a significant improvement as compared to the solubility of a free drug. The in vitro dissolution rate of co-crystal was larger than that of the commercial product.Keywords:co-crystal;ticagrelor;nicotinamide;solubility;dissolution
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2013
·Vol. 172
·期 4
·1859-1865
·
IF 1.893
Li Xiaohua,Zhang Zhujun,Li Yongbo
This work presents a new chemiluminescent (CL) probe array assay. The new type CL probe array is based on enzyme mimics of Co 3 O 4 –SiO 2 mesoporous nanocomposite material, which not only have an excellent catalytic effect on the luminol–H 2 O 2 CL reaction in an alkaline medium but also can be used for the immobilization of enzymes. The linear range of the lactose concentration is 3.0 × 10 −7 to 1.0 × 10 −5 g mL −1 and the detection limit is 6.9 × 10 −8 g mL −1 . β-Galactosidase and glucose oxidase were selected as a model for enzyme assays to demonstrate the applicability of Co 3 O 4 –SiO 2 mesoporous nanocomposite material in multienzyme immobilization. The novel bifunctional CL probe array has been successfully applied to the determination of lactose in milk.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）