JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 4
·1155-1165
·
IF 2.496
Liu Sha,Chen Weiwang,Zhou Xiaomeng
Polyimide (PI) aerogels with crosslinked structure are promising for diverse applications owing to their nano-porous nature and superior properties in many aspects. However, the crosslinkers used for preparing crosslinked PI aerogels are always laboriously available and expensive. The economical melamine therefore was chosen as a substitute in this study. It was proved that the use of melamine was indeed a viable strategy for effectively crosslinking PI chains. The resultant melamine-crosslinked PI (MPI) aerogels were tested to have relatively low shrinkage (as low as 9.96 vol%), ultralight bulk densities (0.084–0.116 g cm −3 ) and low thermal conductivity (< 40.0 mW m −1 K −1 ), together with considerable thermal stability (onset temperature to decompose up to 503 ℃) and acceptable compressive strength (Young’s modulus of 1.12–10.04 MPa). Meanwhile, the morphology and properties of MPI aerogels can also be tailored by regulating the proportion of hybrid diamines as well as the polymer concentration of pristine solution. Given all of these, MPI aerogels using melamine as an economical yet effective crosslinker will have a broad prospect in many fields including thermal insulation.
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ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 43
·2002225
·
IF 16.836
Hang Yin,Yeming Xian,Yongli Zhang,Weijian Chen,Xiaoming Wen,Naveed Ur Rahman,Yi Long,Baohua Jia,Jiandong Fan,Wenzhe Li
The recently emerged hybrid lead halide perovskites demonstrate low-cost fabrication and noteworthy performance, but they have intrinsically unstable properties and contain toxic Pb in a soluble form. Herein, a thus far unreported highly stable lead-free Cs 2 AgFeCl 6 double perovskite is developed. Its crystallographic structure and band structure are demonstrated to be capable of tuning by means of In 3+ incorporation. The as-prepared Cs 2 AgIn x Fe 1− x Cl 6 (0 ≤ x ≤ 1) perovskite single crystals display a broadband absorbance in the range of 450–800 nm, which further enables a remarkable enhancement of photoluminescence quantum yields by a factor of ≈167. Equally important, the incorporation of In atoms is experimentally and theoretically shown to improve the carriers transport ability, which is associated with the substitution of Fe-3d state by In-5s state in the energy range between 1.5 and 2.5 eV that dominates the conductive process, and thereafter may benefit the potential applications in photoelectronic and photovoltaic devices.
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Energy Storage Materials
·
2020
·
IF 16.28
Yan Kou,Keyan Sun,Jipeng Luo,Feng Zhou,Haibo Huang,Zhong-Shuai Wu,Quan Shi
Phase change materials (PCMs) involving significant amounts of latent heat absorbing and releasing at a constant transition temperature have been extensively utilized for thermal management of electronic devices. However, it is still a great challenge to apply thermal management for wearable devices using PCMs due to their solid rigidity and liquid leakage . Although considerable efforts have been dedicated to constructing flexible composite PCMs by physically blending bulk PCMs with different flexible polymers, design and fabrication of intrinsically flexible PCM films still remain unexplored. Herein, we report an intrinsically flexible PCM film with apparent solid-solid phase transition performance, outstanding self-support and shape-conformable property for wearable thermal management. Remarkably, the as-obtained PCM film behaves adjustable phase transition enthalpy and temperature in the region from about (5 to 60)°C, long-term cycling stability up to 1000 cycles, highly mechanical flexibility and remarkable shape tailorability and foldability. Notably, such flexible PCM films are easily integrated into wearable devices with a flexible graphene film as thermal source, revealing superior temperature control behaviors, together with unprecedented electro-thermal and photo-thermal energy conversion performance. The intrinsically flexible PCM film developed in this work is holding great potential for next-generation flexible thermal management electronics .
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 48
·49599
·
IF 2.52
Huimin Xia,Hui Gao,Qiqi Sun,Fazong Wu,Tengteng Ge,Kun Sui,Zhongwei Wang,Liang Song,Xiaowen Huang,Qing Yu
Puerarin, a natural compound, was used as multifunctional protector for polyethylene (PE) and polypropylene (PP). Firstly, puerarin and tetrakis(2,4-di-tert-butylphenol)[1,1-biphenyl]-4,4′-diylbisphosphite (PEPQ) could protect PE and PP against thermos-oxidative degradation: after modification, the oxidation induction time (OIT) of increased ca. 4,160% (PE-P 1200 -P sample) and 130% (PP-P 1200 -P sample); the carbonyl index (CI) obtained through accelerated aging decreased ca. 58% (PE-P 1200 -P sample). Secondly, it is excited to find that puerarin and PEPQ could pretect PE agianst photooxidative degradation: CI value decreased ca. 35% after modification. Thridly, the coorperation of puerarin and PEPQ was also benefit for the processing stability: the change of melt flow rate (MFR) between first and fifth extrusions decreased ca. 83% (PE-P 1200 -P sample) and 99% (PP-P 1200 -P sample). Forthly, puerarin and PEPQ could still protect PE against degradation after five extrusions: the loss of tensile strength and elongation at break decreased ca. 96% and 95% after modification. Finally, the interaction of puerarin with PEPQ was discussed and the role of puerarin in protecting polyolefins was proposed.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-7
·
IF 6.232
Sang Fuming,Yin Suyao,Pan Jianxin,Liu Deli,Zhang Zhizhou
A facile plasmonic nanoplatform was developed for rapid and sensitive determination of nucleic acid. Hg 2+ -regulated molecular beacon (MB, hairpin) containing rich thymine (T) bases at both ends is used as the probe. A hairpin structure can be formed in the MB probe due to the strong binding of Hg 2+ to T. However, in the presence of target DNA, the hairpin structure is opened owing to target DNA-specific hybridization with the aptamer. Simultaneously, the opened MB interacts with poly(diallyldimethylammonium chloride) (PDDA) and hinders PDDA-induced aggregation of AuNPs, accompanied by a color change from blue to red and a decrease in absorption ratio (A 620 /A 520 ). Hence, a good linear relationship was observed between the decreased absorption ratio (A 620 /A 520 ) and DNA concentration ranging from 0.02 to 2 nmol/L with a low detection limit of 4.42 pmol/L. Moreover, this nanoplatform has been successfully utilized to discriminate between perfect target and mismatch sequences. More importantly, the bioassay is simple, versatile, rapid, and cost-effective compared with other common methods, which holds great promise for clinical diagnosis and biomedical application.
Graphical abstract
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 8
·1013-1021
·
IF 1.536
Li Yuwei,Lian Ruili,Wang Xinmin,Liu Yonglu
Although ionic liquids have been studied as self-assembly media, the aggregation of fluorinated surfactants in ionic liquids has not been fully understood. In this work, the aggregation behavior of the fluorinated surfactant, N-ethylperfluorooctane sulfonamide (N-EtFOSA), in the aprotic ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate ([C 2 mim][EtSO 4 ]), was studied using surface tension, 19 F-NMR, dynamic light scattering (DLS), and cryo transmission electron microscopy (cryo-TEM). The surface properties and thermodynamic parameters were calculated based on the results of surface tension measurements. It was found that the fluorinated surfactant exhibits a considerable surface activity in aprotic ionic liquids, and its critical micelle concentration (cmc) increases with increasing temperature. In addition, the surface properties indicate that solvophobic interactions are the main driving force for micelle formation. The thermodynamic parameters for micelle formation derived from the temperature dependence of the cmc revealed that micelle formation is an enthalpy-driven process. DLS and cryo-TEM results indicated the presence of nanoscale micelles in the N-EtFOSA + [C 2 mim][EtSO 4 ] system. The results of this work imply that this fluorinated surfactant exhibits a more pronounced surface activity than conventional hydrocarbon surfactants in [C 2 mim][EtSO 4 ].
The self-assembly of fluorinated surfactants in aprotic ionic liquids
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Science Advances
·
2021
·Vol. 7
·期 30
·
IF 14.143
Xiaofei Chen,Guohua Zhang,Bao Li,Lixin Wu
A strategy integrating near infrared (NIR) photothermal and catalytic effects within one active center beyond ultraviolet and visible light is proposed without the combination of separated photothermal transformation components. A giant polyoxomolybdate, which has high NIR photothermal conversion efficiency, is selected as the model catalyst, while a cationic β-cyclodextrin is used to cover its negatively charged surface electrostatically. Under NIR light radiation, the designed catalyst increases catalytic activity of cyclohexene oxidation under O2 atmosphere in water. The conversion reaches about pentaploid of the reaction without NIR radiation. By excluding heating effect from the external heater at the same temperature, about twice as much enhancement, which can be attributed to the sole photothermal action, is still observed. While the catalytic center is shielded by the organic porous layer, the surface cavity allows the integrated catalyst to conduct a selective catalysis by screening the molecules in size over the surface channel.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2019
·Vol. 13
·期 6
·1-10
·
IF 3.883
Liang Bin,Kong Deyong,Qi Mengyuan,Yun Hui,Li Zhiling,Shi Ke,Chen E.,Vangnai Alisa S.,Wang Aijie
Trimethoprim (TMP) is an antibiotic frequently detected in various environments. Microorganisms are the main drivers of emerging antibiotic contaminant degradation in the environment. However, the feasibility and stability of the anaerobic biodegradation of TMP with sulfate as an electron acceptor remain poorly understood. Here, TMP-degrading microbial consortia were successfully enriched from municipal activated sludge (AS) and river sediment (RS) as the initial inoculums. The acclimated consortia were capable of transforming TMP through demethylation, and the hydroxyl-substituted demethylated product (4-desmethyl-TMP) was further degraded. The biodegradation of TMP followed a 3-parameter sigmoid kinetic model. The potential degraders ( Acetobacterium, Desulfovibrio, Desulfobulbus , and unidentified Peptococcaceae) and fermenters ( Lentimicrobium and Petrimonas ) were significantly enriched in the acclimated consortia. The AS- and RS-acclimated TMP-degrading consortia had similar core microbiomes. The anaerobic biodegradation of TMP could be coupled with sulfate respiration, which gives new insights into the antibiotic fate in real environments and provides a new route for the bioremediation of antibiotic-contaminated environments.
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Molecular Brain
·
2019
·Vol. 12
·期 1
·1-12
·
IF 4.051
Wang Xin-shang,Guan Shao-yu,Liu An,Yue Jiao,Hu Li-ning,Zhang Kun,Yang Liu-kun,Lu Liang,Tian Zhen,Zhao Ming-gao,Liu Shui-bing
Chronic pain is commonly accompanied with anxiety disorder, which complicates treatment. In this study, we investigated the analgesic and anxiolytic effects of Formononetin (FMNT), an active component of traditional Chinese medicine red clover ( Trifolium pratense L.) that is capable of protecting neurons from N-methyl-D-aspartate (NMDA)-evoked excitotoxic injury, on mice suffering from complete Freund’s adjuvant (CFA)-induced chronic inflammatory pain. The results show that FMNT administration significantly reduces anxiety-like behavior but does not affect the nociceptive threshold in CFA-injected mice. The treatment reverses the upregulation of NMDA, GluA1, and GABA A receptors, as well as PSD95 and CREB in the basolateral amygdala (BLA). The effects of FMNT on NMDA receptors and CREB binding protein (CBP) were further confirmed by the potential structure combination between these compounds, which was analyzed by in silico docking technology. FMNT also inhibits the activation of the NF-κB signaling pathway and microglia in the BLA of mice suffering from chronic inflammatory pain. Therefore, the anxiolytic effects of FMNT are partially due to the attenuation of inflammation and neuronal hyperexcitability through the inhibition of NMDA receptor and CBP in the BLA.
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高影响因子
POLYMER COMPOSITES
·
2019
·Vol. 40
·期 11
·4248-4256
·
IF 2.268
Shuai Zhao,Jian Cui,Guangfa Zhang,Ailin Gao,Yehai Yan
Phenolic resin (PR) grafted graphene (G-PR), synthesized from the versatile graphene modification platform 2-(3, 4-dihydroxyphenyl) pyrrolidine grafted pristine graphene (G-OH), is used to develop high-performance phenolic composites. Benefiting from good properties of G-PR, uniform dispersion of G-PR and strong PR/G-PR interfacial interaction, G-PR shows obvious advantages as a filler in improving mechanical, electrical, and thermal properties of PR over pristine graphene (pG) and graphene oxide (GO) derivatives. For PR/G-PR composites, the maximum tensile strength attains 51.4 MPa at 0.5 wt% graphene content. Electrical and thermal conductivities reach to 10 −3 S·cm −1 and 0.374 W·m −1 ·k −1 at 5 wt% graphene content, respectively. The decomposition temperature and residue at 800°C separately increase by 61°C and 3.5 wt% at 1 wt% graphene content. In a word, this contribution provides an alternative avenue for preparing high-performance and multifunctional PR/graphene composites, avoiding the high risk and serious pollution of graphene oxide (GO) avenue.
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Energy & Environmental Science
·
2019
·Vol. 12
·期 8
·2455-2462
·
IF 33.25
Zhenglei Yin,Hanqing Peng,Xing Wei,Huan Zhou,Jun Gong,Mingming Huai,Li Xiao,Gongwei Wang,Juntao Lu,Lin Zhuang
The electrochemical conversion of CO2 to fuels or chemicals is an attractive approach that can combine sustainable energy utilization and carbon recycling, but its practicability is still vague, because the CO2 reduction reaction (CO2RR) has hitherto been mostly studied in electrolyte solutions, with small current densities limited by the solubility of CO2. An important and urgent task is thus to develop CO2 electrolyzers that can demonstrate the feasibility of the large-scale conversion of CO2, in particular analogs of water electrolyzers using polymer electrolyte based gas-diffusion electrodes. Here we report a high-performance CO2 electrolyzer making use of alkaline polymer electrolytes (APEs). A highly conductive and stable APE, quaternary ammonia poly(N-methyl-piperidine-co-p-terphenyl) (QAPPT), was applied both as the membrane separator and the ionomer impregnating the gas-diffusion electrodes. Dry CO2 was fed into the Au cathode, with a faradaic efficiency of CO production (COFE) over 85%, and the oxygen evolution reaction (OER) occurred at the IrO2 anode fed with pure water. The cell was operated at temperatures up to 80 °C, and the current density reached 0.5 A cm−2 at 3 V at 60 °C. The stability of this electrolyzer was tested under 0.1 A cm−2, and the cell voltage remained stable at 2.25 V over 100 h, with the COFE staying at 90–95%.
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Mingrui Tan,Ning Sui,Qinghui Liu,Zhihui Kang,Lin Wang,Wenquan Wang,Qiang Zhou,Hanzhuang Zhang,Yinghui Wang
Low-toxicity zinc blende Mn–CuInS (MCIS) thin films and a corresponding optical switch were fabricated and examined using multiple measurements. Transient absorption spectroscopy indicated that multiple carrier processes occurred during carrier relaxation. The optical switch devices showed good responsivity and stability. The kinetics of the photo-generated charge carriers were affected by carrier concentration and showed no electric-field dependence. These prepared devices showed potential for rapid photodetection applications.
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