JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Cheng Liu,Lei Jin,Fang-Zu Yang,Zhong-Qun Tian
A series of ferrochrome alloy layers with different iron contents are electrodeposited. The phase transformation sequences of the electrodeposited Cr-29.51 wt% Fe alloy layer upon heat treatment are studied in detail. X-ray diffraction analysis shows that as the iron content of the layer increases, the ferrochrome alloy layer changes from a crystalline structure of a substitutional solid solution, then to a mixed-structure of amorphous and crystalline, and finally to an amorphous structure. The differential scanning calorimetry curves at heating rates ranging from 5 °C/min to 20 °C/min, accompanied with the heat treatment, indicate that the layer starts the first crystallization at around 692.45–722.15 K and then precipitates new phases of Cr 2 O 3 and Cr 23 C 6 at around 870.35–895.95 K. Their apparent activation energies are 172.1 ( E a1 ) for the crystallization and 341.6 kJ/mol ( E a2 ) for the new phase precipitation, respectively. After the heat treatment, the iron content on the surface of the layer is significantly reduced while the O strongly increased.
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ChemPlusChem
·
2018
·Vol. 83
·期 12
·1119-1126
·
IF 3.205
Yunfang Gao,Huojun Wan,Yunchuan Xia,Xin Xu,BaoLiang Wu
Graphical Pores for effect : A hierarchically porous lead-modified phenolic resin-based carbon (Pb/PRC) material was synthesized from lead-modified phenolic resin (Pb/PR), which in turn was prepared by chelation of a phenolic resin (PR) by lead ions in solution. Toluene and KOH served as the pore-forming agent and the activating agent, respectively. The hierarchically porous Pb/PRC was applied in a lead-carbon battery. A novel and scalable lead-modified phenolic resin-based carbon material (Pb/PRC) has been successfully prepared by using lead-modified phenolic resin (Pb/PR) as a precursor, toluene as a pore-forming agent, and KOH as an activating agent. The Pb/PRC composite presents a hierarchically porous nanosphere structure, and this structure contributes to prolong its cycling life under high-rate partial state-of-charge (HRPSoC) operation. Pb/PRC with nano-lead can effectively inhibit hydrogen evolution and provide pseudocapacitance. Compared with a blank negative plate, a lead-carbon battery with Pb/PRC displays 18 000 cycles under HRPSoC operation and exhibits a capacity of 100 mA h g −1 at 2 C discharge rate.
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高影响因子
JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Yang Zhao,Lihong Yu,Xinping Qiu,Jingyu Xi
It is essential to boost the catalytic activity and cycling stability of the electrode for the ultra-long-term operation of vanadium flow battery (VFB). Herein, we report a novel hierarchical electrode by coating carbon spheres on the graphite felt (CS/GF) employing silicon dioxide nanospheres as templates and phenol formaldehyde resin as carbon sources. CS/GF possess larger surface areas and more defects than the thermally activated graphite felt, leading to better wettability and more active sites. As a result, the electrochemical activity and kinetic reversibility of the CS/GF electrode toward the VO 2 + /VO 2+ and V 3+ /V 2+ redox couples are promoted. Meanwhile, the novel carbon layer-confined structure ensures the superior durability of the CS/GF electrode during the ultra-long-term cycling test. The VFB assembled with CS/GF electrode exhibits outstanding rate performance at current densities of 50–300 mA cm −2 as well as excellent stability over 5000 charge-discharge cycles at a high current density of 150 mA cm −2 . The facile method in this work provides a new idea for developing efficient and durable VFB electrodes.
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RSC Advances
·
2019
·Vol. 9
·期 37
·21566-21571
·
IF 3.049
Weihua Zou,Delin Sun,Zhangheng Wang,Ruoyao Li,Wenxuan Yu,Pingfang Zhang
Farmed poplar could meet the human demand for transparent wood-based composites to replace glass, avoiding the consumption of natural forest resources. We removed the lignin of poplar using a potassium hydroxide (KOH) and deionized water solution, the waste black liquor could be converted into compound potassium fertilizer after being neutralized by phosphoric acid. Polyurethane (PU) was then added to the lignin-stripped poplar and hardened, the transparent poplar-based composite (TPC) has stable transparency at high temperatures, and flexibility – it elongates (about 15%) before breaking. These properties could provide more uses in hot environments requiring a flexible shape. The TPC PU provides transmittance of 85%, haze of 83%, and anisotropic light diffraction.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Matteo Ciprian,Karla Hernandez Ruiz,Meruyert Kassymova,Tingting Wang,Serge Zhuiykov,Somboon Chaemchuen,Rong Tu,Francis Verpoort
3D metal N-doped carbon frameworks (M-NCFs) are produced from the direct pyrolysis of 2D zeolitic imidazolate frameworks (ZIF-L Zn and Co) in a reducing atmosphere. The effects of the thermal treatment were studied in order to achieve the desired catalyst. The results show that metal nanoparticles and N-doping species present in the carbon matrix have a direct influence on the catalytic performance. Zn/NCF-1000 displayed quantitative conversion and selectivity towards the chemical fixation of carbon dioxide through the cycloaddition with epoxides. Furthermore, the magnetic property of the newly synthesized Co/NCF-600 was used to demonstrate its superior stability and recyclability, retaining the same catalytic activity for more than 10 cycles.
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NANOTECHNOLOGY
·
2018
·Vol. 30
·期 3
·035601
·
IF 3.404
Hongshuai Wu,Chaoqun You,Jia Jiao,Fanghui Chen,Baiwang Sun,Xiaoli Zhu
A combination of photothermal-chemotherapy has received widespread attention in drug delivery systems for cancer treatment. However, the combination therapy operated in subcellular organelles, such as mitochondria, has been rarely reported. Herein, we designed a novel near-infrared (NIR) triggered dual-targeted nanoplatform (FA/TPP-DINPs) based on mitochondrial combined photothermal-chemotherapy by co-loading FDA-approved NIR dye indocyanine green (ICG) and anticancer drug doxorubicin (DOX). The resulting nanoparticles showed a monodispersed sphere and excellent colloidal stability. Specially, the simultaneous introduction of targeted ligands folic acid (FA) and triphenylphosphine (TPP) to nanoparticles significantly promoted the cellular internalization and mitochondrial co-localization of nanoparticles. Moreover, the encapsulated dye could convert NIR light into heat with high efficiency, which makes the FA/TPP-DINPs an effective platform for mitochondrial combination therapy with chemotherapy drug DOX. Meanwhile, the thermal expansion in response to the change of temperature after sustained 808 nm laser irradiation could cause the disintegration of nanoparticles, which triggered the rapid release of DOX from nanoparticles. As expected, the prepared FA/TPP-DINPs exhibited evidently enhanced cytotoxicity and preeminent combination therapy efficiency on MCF-7 cells. Thus, the NIR triggered dual-targeted nanoplatform provides a new drug delivery strategy for mitochondrial combined photothermal-chemotherapy of cancer.
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高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Xiaoxi Zuo,Jinhua Wu,Xiangdong Ma,Xiao Deng,Jiaxin Cai,Qiuyu Chen,Jiansheng Liu,Junmin Nan
A poly(vinylidene fluoride)/ethyl cellulose and amino-functionalized nano-SiO 2 (PVDF-EC-(A-SiO 2 )) composite coated on polyethylene (PE) is developed as the functional separator of 5 V high-voltage lithium ion batteries with enhanced performance. Compared with the PE separator, the composite membrane has a uniform interconnected structure, an increased melting temperature from 138 °C (PE) to 140.8 °C, a decreased contact angle from 49.5° to 23.2°, and higher ionic conductivity from 0.34 mS cm −1 to 0.79 mS cm −1 . In particular, the electrochemical window is raised to 5.3 V (vs. Li/Li + ). LiNi 0.5 Mn 1.5 O 4 /Li batteries with this separator display a high discharge capacity of 131.6 mAh g −1 and a superior cycling stability with a capacity retention of 95.7% after 200 cycles at 0.5 C. Those results demonstrate that the PVDF-EC-(A-SiO 2 )/PE composite separator exhibits a good-performance in cycling stability and thermal stability, implying promising potential application in high-voltage lithium ion batteries.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2013
·
IF 2.145
Rui-tang Guo,Yue Zhou,Wei-guo Pan,Jie-nan Hong,Wen-long Zhen,Qiang Jin,Cheng-gang Ding,Shi-yi Guo
CeO 2 /Al 2 O 3 catalysts prepared by three methods were investigated for selective reduction of NO with NH 3 . It was found that the catalyst prepared by the single step sol–gel method had the best SCR activity and SO 2 resistance performance. From the results of BET, XRD, TPD and TPR, it can be concluded that large surface area, strong interaction, highly dispersed nano-crystalline ceria , high NH 3 adsorption capacity and good redox ability might be the main reasons for the excellent performance of CeO 2 /Al 2 O 3 catalyst prepared by the single step sol–gel method.
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CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Haizhen Chen,Jinping Ni,Jing Chen,Wenwen Xue,Jinggang Wang,Haining Na,Jin Zhu
Water and four small molecular alcohols are respectively used to activate corn cellulose (CN cellulose) with the aim to improve the dissolvability in DMAc/LiCl. Among all these activated agents, monohydric alcohols are found to produce the optimal effect of activation in the whole process including of activating, dissolving, and electrospinning of CN cellulose. Meanwhile, well distributed fibers with the diameter of 500 nm–2 μm are fabricated in electrospinning. Understanding the activation effect of monohydric alcohols with water and polyhydric alcohols, the most effective activated agent is ascertained with the characteristics of small molecular size, low viscosity, and single functionality. This work is definitely initiated to understand the critical principle of CN cellulose in dissolving. Accordingly, a feasible methodology is also established to prepare ultrafine cellulose fibers with good morphology in electrospinning.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 11
·
IF 1.768
Fei Qu,Shuwen Niu,Jinmao You
Hyperbranched poly(ethylene imine) (PEI)-capped Ag nanoclusters, synthesized starting from an aqueous environment, dispersed well in water and most polar organic solvents. However, with the addition of 1,4-dioxane, the PEI-capped Ag nanoclusters could be separated completely to obtain hydrophilic and hydrophobic Ag nanoclusters. Through this facile method, the successful phase transfer of PEI-capped Ag nanoclusters from the aqueous phase to the nonpolar organic phase, such as from water to carbon tetrachloride, chloroform, and methylene bichloride, was easily realized. The polarity reversal of Ag nanoclusters were considered to be associated with the conformational change of PEI on the basis of the hydrophobic methylene groups of polymer backbone facing the external side or internal side, and this polarity reversal was irreversible. Moreover, PEIs with higher molecular weights showed a higher efficiency of phase transfer of the Ag nanoclusters. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43206.
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Journal of Nanomaterials
·
2015
·
IF 1.644
Qiufang Yao,Chunde Jin,Huanhuan Zheng,Zhongqing Ma,Qingfeng Sun
Magnetic NiFe2O4 nanoparticles were successfully deposited on the wood surface via a hydrothermal process at 70°C. The surface of the as-prepared magnetic NiFe2O4/wood hybrids (MWHs) was covered by spherical-like NiFe2O4 particles with an average size of 50 nm. MWH exhibited the thermostability, microwave absorbability, and superparamagnetism with saturation magnetization () of 1.79 emu·g−1. With further modification by 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS-17), MWH expressed superhydrophobic performances with a water contact angle of 158°. Its superparamagnetism stably remained under harsh conditions after chemical solutions corrosion and physical frozen test.
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THERMOCHIMICA ACTA
·
2015
·
IF 2.184
Sanguo Peng,Shi Zhang,Ying Zhang,Xiangyang Liu,Maogang He
Mutual diffusion coefficients of several short chain alcohols (ethanol, n -propanol and n -butanol) + n -octane mixtures in the temperature range from 283.2 K to 313.2 K at different concentrations were measured using holographic interferometry. The relation between the mutual diffusion coefficient with temperature, viscosity, concentration and molecular weight is investigated, respectively. The Onsager–Fuoss model is applied to analyse the various influence factors. A new correlation taking into account the effect of the temperature and concentration on the mutual diffusion coefficient is proposed to fit well the experimental data.
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危险品化学品经营许可证（带存储）