RSC Advances
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2015
·Vol. 5
·期 84
·68476-68484
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IF 3.84
Qinqin Luo,Yanchao Yuan,Chunlei Dong,Shumei Liu,Jiangqing Zhao
5,10-Dihydro-phenophosphazine-10-oxide (DPPA) served as a co-curing agent for 4,4′-diaminodiphenylmethane in the curing reaction of bisphenol A diglycidyl ether (DGEBA) epoxy resin (EP). 1H NMR tracking the reaction of DPPA with DGEBA revealed that the P–H bond in DPPA had a higher reactivity with the epoxy group than the N–H bond. DPPA could promote the curing reaction of DDM with DGEBA. DPPA endowed the epoxy resin with a high flame-retardant efficiency due to the unique combination of phosphorus and nitrogen in the phenophosphazine ring. The cured epoxy resin could achieve a V-0 rating in the UL-94 test with a limiting oxygen index (LOI) of 33.6% at only 2.5 wt% DPPA. The reduced peak heat release rate and total heat release, and increased char yield further verified the excellent flame retardancy of EP. The flame-retardant mechanism of the epoxy resin was investigated by thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR), scanning electron microscopy, elemental analysis and FTIR spectrometry. The results indicated that DPPA catalyzed the formation of the rigid intumescent char and the generation of the blowing-out effect in the epoxy resin matrix.
研究领域:
材料科学
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化学工程
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FUEL
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2023
·
IF 7.4
Junjian Xie,Jun Zhang,Xiaoyu Wang,Jiawei Xie,Bo Yang,Yuxuan Liang,Ji-Jun Zou,Qiuyu Zhang
JP-10 is the most widely used petroleum based fuel in military aircraft due to its high energy density and excellent cryogenic properties. However, the high price and low availability limit its application in civil aviation. Herein, JP-10 analogues fuel was first synthesized via one-pot Diels-Alder/hydrodeoxygenation reaction using biomass-derived furans and petroleum-derived norbornene. Hβ zeolite with Si/Al ratio of 25 exhibits the best catalytic performance (yield of 75.9 %) for Diels-Alder reaction ascribed to its large surface area and high acid concentration, especially the high ratio of Brønsted/Lewis acid sites. Kinetics research indicates that Diels-Alder reaction of norbornene and 2-methylfuran shows the apparent activation energy of 45.67 kJ/mol, much lower than that of norbornene dimerization (52.48 kJ/mol) and 2-methylfuran trimerization (63.61 kJ/mol). Importantly, the synthesized fuel has much higher density, volumetric neat heat of combustion and better cryogenic viscosity (0.943 g mL −1 , 40.39 MJ/L and 12.9 mm 2 s −1 at −40 °C) than classic JP-10 fuel (0.936 g mL −1 , 39.41 MJ/L and 18.6 mm 2 s −1 at −40 °C). This work provides an efficient and promising route to produce high-performance JP-10 fuel alternatives through co-conversion of biomass and petroleum derivatives.
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Binbin Zhang,Huizhong Zhao,Yajie Gao,Qingge Wang,Zhihao Xi,Kui Wang
On the basis of the method used by Reinsch and Solovyeva, the aluminum based MOF material CAU-10-H (CAU stand for Christian-Albrechts-University) was synthesized by multiplying the amount of aluminum sulfate octahydrate and isophthalic acid by 10 times. CAU-10-H (b) is obtained after washing. In order to improve the water vapor adsorption performance of pure CAU-10-H (b), lithium chloride (LiCl) solution was compounded with CAU-10-H (b) by impregnation method to obtain a composite adsorbent CAU-10-H (L) and its adsorption characteristics were studied. The results showed that the composite adsorbent showed good adsorption and desorption performance under test conditions. Among them, the equilibrium adsorption capacity of the composite adsorbent with 33.1% LiCl content is 0.5007 g/g after 30 cycles, which is about 1.675 times of the adsorption capacity of pure CAU-10-H (b) under the same conditions. This shows the potential of the composite adsorbent to be used in the air-water extraction system.
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MATERIALS TECHNOLOGY
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2022
·
IF 3.297
Shichao Wu,Xiaobing Yang,Xiangrui Yang
Due to the complexity of cancer, combination therapy has been widely used in the clinic. The use of two kinds of anticancer agents with a synergistic effect may achieve excellent therapeutic effects, especially against drug-resistant tumours. In this paper, MTX and HCPT loaded pullulan nanoparticles (MHNPs) were prepared for tumour-targeted synergistic therapy. In the nanoparticles, MTX could serve as both a targeting ligand and a cytotoxic agent. The MHNPs possessed a size of 185.7 ± 16.7 nm and a sustained release profile of the dual drug over a period of 48 h. The cytotoxicity assays stated that the MHNPs exhibited an enhanced killing ability to HeLa cells than the individual drug loaded NPs. These results suggest that the MHNPs could be a potential carrier with an efficient antitumor effect for tumour-targeted drug delivery.
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TRANSACTIONS OF TIANJIN UNIVERSITY
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2022
·Vol. 28
·期 5
·414-422
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IF 0
Shao Wu,Wu Wenjun
Ensuring high power conversion efficiency, partially or completely replacing Pt electrodes with inexpensive materials is one of the important development directions of dye-sensitized solar cells (DSSCs). In this work, we have developed a three-component (MWCNTs, carbon black and graphite) carbon (tri-carbon) electrode material for DSSC devices combined with the advantages of high electron transfer kinetics of MWCNTs, plentiful catalytic sites in crystal edges of carbon black and superior electrical conductivity and catalytic activity of graphite. Using a tri-carbon electrode, a Pt electrode, and two N719-sensitized photoanodes, a parallel tandem dye-sensitized solar cells are assembled obtaining a high PCE of 10.26% ( V oc = 0.70 V, J sc = 19.99 mA/cm 2 , FF = 73.33%). It opens up a new avenue for the development of low-cost and high-performance DSSCs.
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Journal of Inorganic and Organometallic Polymers and Materials
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2022
·Vol. 32
·期 8
·2986-2993
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IF 3.518
Hao Bei-bei,Deng Xiu-zhen,Yang Jia-ke,Jia Ying-dong,Shang Xiao-jun,Shi Yong-li,Yan Xi-qing
A novel folate-decorated and magnetic mediated drug delivery system was fabricated by combining folate and magnetic nanoparticles to the surface of silica mesoporous nanoparticles (FMMSNs) via chemical reaction. The 10-hydroxycamptothecin (10-HPCT), an analogue of camptothecin, was sealed in the mesoporous to evaluate the system’s pharmaceutics performance. The diameter of the FMMSMs was about 100 nm and the in vitro release result showed that the applied magnetic field could influence the release process. The result of the inhibition rate of the 10-HPCT loaded FMMSNs to HepG-2 cells revealed that they could be influenced by the applied magnetic field or the folic acid bonded on the surface of the mesoporous nanoparticles.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Qi Shen,Pan-Ling Zhou,Bin-Tong Huang,Juan Zhou,Hai-Ling Liu,Saud Asif Ahmed,Xin-Lei Ding,Jian Li,Yue-Ming Zhai,Kang Wang
Gold nanopore is promising to be used in single molecule sequencing by measuring surface enhanced Raman scattering (SERS) spectrum. To achieve this goal, fabrication of small and size-controllable single gold nanopore is in urgent need. We synthesized gold nanoplates with a sub-10 nm single nanopore at the center, which was then successfully attached at the tip of a glass nanopipette using sulfhydryl silane. The transport of about 1.4 × 10 3 rhodamine 6G molecules was detected using SERS. The current blockage caused by single lambda DNA passing through the nanopore was also observed. The translocation time of lambda DNA through the gold nanopore was much longer than that of lambda DNA through the bare glass nanopipette, revealing the strong DNA-gold nanopore interaction affected the transport behavior of lambda DNA. The observed result further shows that the time resolution of SERS (~ms) may match the transport time of DNA through plasmonic nanopore. The sub-10 nm gold nanopore is possible to be used in single molecule transport detection with the improvement of the nanopore attachment.
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JOURNAL OF AEROSOL SCIENCE
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2021
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IF 3.433
Yiliang Liu,Michel Attoui,Yueyang Li,Jianmin Chen,Qing Li,Lin Wang
A butanol-based fast condensation particle counter (Fast CPC, Model 3650, Kanomax Inc., Japan) was characterized in this study with three different types of monodisperse particles, including positively and negatively charged nickel-chromium (Ni/Cr) particles, positively charged tetraheptyl ammonium bromide (THABr) and tetrabutyl ammonium bromide (TBABr) particles, and positively charged polyethylene glycol (PEG) particles. The PEG particles were characterized with varied numbers of charges, whereby the charge number effect on particle activation was investigated. The performance of the Fast CPC was compared with a TSI® 3775 CPC and a TSI® 3776 CPC, respectively, under both factory temperature settings and boosted temperature settings, the latter of which corresponded to the brink of butanol homogeneous nucleation. Our results show that size-resolved Ni/Cr particles were detected by the Fast CPC with comparable detection efficiencies regardless of the charge polarity. When the charge number on a PEG particle increased from 1 to 3, an increasing tendency of the detection efficiency was observed, hinting that multiple charges on a particle will facilitate its activation. Particle activation was affected by the particle chemical composition as well, which is suggested by the higher activation efficiencies of PEG particles than those of Ni/Cr particles. The effects of multiple charges and chemical composition on particle activation were both more significant under factory temperature settings, but became less pronounced under boosted temperature settings. In addition to a quicker response time, the Fast CPC was capable of detecting sub-3 nm particles under boosted temperature settings, with the detection efficiency higher than that of the 3775 CPC but lower than that of the 3776 CPC, and can be used as a good candidate for the measurement of rapidly varying concentrations of small particles.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 35
·2103534
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IF 18.808
Zhenye Wang,Meichen Xu,Zhilin Li,Yerun Gao,Lvpeng Yang,Di Zhang,Ming Shao
Stretchable organic solar cells (OSCs) simultaneously possessing high-efficiency and robust mechanical properties are ideal power generators for the emerging wearable and portable electronics. Herein, after incorporating a low amount of trimethylsiloxy terminated polydimethylsiloxane (PDMS) additive, the intrinsic stretchability of PTB7-Th:IEICO-4F bulk heterojunction (BHJ) film is greatly improved from 5% to 20% strain without sacrificing the photovoltaic performance. The intimate multi-layers stacking of OSCs is also realized with the transfer printing method assisted by electrical adhesive “glue” D-Sorbitol. The resultant devices with 84% electrode transmittance exhibit a remarkable power conversion efficiency (PCE) of 10.1%, which is among the highest efficiency for intrinsically stretchable OSCs to date. The stretchable OSCs also demonstrate the ultra-flexibility, stretchability, and mechanical robustness, which keep the PCE almost unchanged at small bending radium of 2 mm for 300 times bending cycles and retain 86.7% PCE under tensile strain as large as 20% for the devices with 70% electrode transmittance. The results provide a universal method to fabricate highly efficient intrinsically stretchable OSCs.
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Nano Energy
·
2021
·
IF 17.881
Yongteng Qian,Jianmin Yu,Fangfang Zhang,Yingbo Kang,Chenliang Su,Huan Pang
The fabrication of flexible and high-output triboelectric nanogenerators (TENGs) based on low-cost inorganic functional materials has been receiving increasing attention. In this study, sub-10 nm ZnS/ZnO nanoflakes (ZnSO NFs) were successfully synthesized using a facile method and subsequently combined with polydimethylsiloxane (PDMS) as a triboelectric layer material for the flexible TENGs (FTENGs). The prepared PDMS/ZnSO NFs-based FTENGs presented a remarkable output power density (~2.95 mW cm −2 ) and excellent flexibility (the output power density retained ~82% of its initial value after 2000 bending cycles). Moreover, when a 2 × 2 cm 2 PDMS/ZnSO NFs-based FTENG was subjected to a force applied by a human fist, it powered 70 LEDs, which confirms that the ultra-thin ZnSO NFs we developed are promising candidates for high-output FTENGs.
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BIOCHEMICAL ENGINEERING JOURNAL
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2021
·
IF 3.978
Shuiquan Chen,Meng Zang,Lin Li,Juntao Chen,Qiyou Liu,Xiwen Feng,Shuo Sun,Chuanwei Zang,Chaocheng Zhao
Biodesulfurization is a promising, environmentally friendly method to desulfurize the organosulfur compounds in crude oils through the highly selective cleavage of carbon-sulfur bonds under mild reaction conditions. In this study, the behavior of a hydrophobic bacterium, Gordonia sp. SC-10, was evaluated in the presence of diesel oils. The biodesulfurization pathways, bacterium hydrophobicity , and cell ultrastructure were investigated, and the capability of strain SC-10 to desulfurize diesel oil was also studied. The results showed that strain SC-10 can desulfurize organosulfur compounds through sulfur-specific desulfurization pathways by producing corresponding hydroxylated products in oil-water polyphasic systems. Mycolic acids consisting of 47 and 58 carbon atoms chains were produced on the cell surface, and inclusion bodies were produced in the cells, both of which may improve the bioavailability of the substrates, thereby enhancing its adaptability to oil-water polyphasic systems. To our knowledge, this is the first report of intracellular inclusion body formation during biodesulfurization. Strain SC-10 also exhibited broad substrate specificity towards organosulfur compounds and effectively desulfurized diesel oils. The sulfur content in real-life diesel oil was reduced from 167.7 mg/L to 19.7 mg/L, with 88.3% of sulfur removed after five days of biodesulfurization. This study showed that Gordonia sp. SC-10 can be effectively used for the biodesulfurization of diesel oils.
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Journal of Water Process Engineering
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2020
·
IF 3.465
Zhiling Ma,Qunpeng Jia,Yanzhe Shi,Xiaofei Duan,Bing Han
TXP-10 is a commercial member of alkylphenol polyethoxylate surfactant family that is widely adopted as emulsifier, detergent and dispersing agent in agriculture and industry. However, it has adverse effects on environmental and public health due to the risk of eutrophication, oestrogenic activities and anti-precipitation properties. Here, we evaluated critical parameters and addressed the mechanism of aeration-assisted photodegradation of TXP-10 by using TiO 2 particulates as model photocatalysts. It was found that O 2 aeration could significantly enhance photocatalytic degradation efficiencies with a high synergetic index of 3.30 at an optimum rutile composition of 90 wt.%. Trapping experiments and superoxide radical quantification suggest two parallel mechanism pathways (O 2 -sensitive and -insensitive) dependent on phase composition of photocatalyst and irradiation intensity. Furthermore, the anti-precipitation property of TXP-10 solution during photocatalysis was evaluated and correlated to transformation of hydrophobic groups to hydrophilic derivatives. This work would gain important enlightenment into the mechanism of synergistic effect of aeration-assisted photocatalysis and its essential role in the environmental remediation.
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