SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Dongmei Pu,Pengju Chen,Peng Xiao,Zhuan Li,Pingyi Deng,Liang Pang,Jinwei Li,Yang Li
A dense and uniform c -AlPO 4 and SiC whisker co-modified mullite coating was successfully prepared on SiC-coated C/SiC composites with a thickness of about 70 μm by hydrothermal electrophoretic deposition . The thermal cycling performance of the coating samples was evaluated by thermally cycling between 1773 K and room temperature in a corundum tube furnace. Results show that the addition of SiC whisker (SiC w -mullite coating) significantly improved the thermal cycling resistance of single mullite outer layer on account of the toughening mechanism of SiC whiskers, such as whisker bridging and crack deflection. Then, the addition of c -AlPO 4 ( c -AlPO 4 -SiC w -mullite coating, termed ASM coating) further improved the thermal cycling resistance on account of the healing and bonding performances of c -AlPO 4 at high temperature. After 40 thermal cycles, the weight loss of ASM coating on SiC-coated C/SiC composites was 4.5% compared to 5.24% for the SiC w -mullite coating. The retention rate of compressive strength of ASM coating on SiC-coated C/SiC matrix was 80.66% compared to 73.65% for the SiC w -mullite coating.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Lingchen Meng,Shan Jiang,Meiyu Song,Fei Yan,Wei Zhang,Bin Xu,Wenjing Tian
Fluorescent thermometers with near-infrared (NIR) emission play an important role in visualizing the intracellular temperature with high resolution and investigating the cellular functions and biochemical activities. Herein, we designed and synthesized a donor−Π–acceptor luminogen, 2-([1,1′-biphenyl]-4-yl)-3-(4-((E)-4-(diphenylamino)styryl) phenyl) fumaronitrile (TBB) by Suzuki coupling reaction. TBB exhibited twisted intramolecular charge transfer-based NIR emission, aggregation-induced emission, and temperature-sensitive emission features. A ratiometric fluorescent thermometer was constructed by encapsulating thermosensitive NIR fluorophore TBB and Rhodamine 110 dye into an amphiphilic polymer matrix F127 to form TBB&R110@F127 nanoparticles (TRF NPs). TRF NPs showed a good temperature sensitivity of 2.37%·°C–1, wide temperature response ranges from 25 to 65 °C, and excellent temperature-sensitive emission reversibility. Intracellular thermometry experiments indicated that TRF NPs could monitor the cellular temperature change from 25 to 53 °C for Hep-G2 cells under the photothermal therapy agent heating process, indicating the considerable potential applications of TRF NPs in the biological thermometry field.
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高影响因子
NANO
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2020
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IF 1.566
Bo Tang,Li Ji,Yuanzhe Dai,Haiqun Chen,Zhenyu Zhang,Zhengwei Wang,Sen Li
MOF-based composite material is adopted to modify photoanode, and the obtained large BET area is found meaningful to the dye loading amount, which brings about a high short circuit current and incident photon to current conversion efficiency. Meanwhile, three-dimensional graphene networks (3DGNs) are employed to provide a fast transport channel for photo-induced electrons. The morphology is analyzed by SEM, TEM, XRD and Raman spectrum, and the photovoltaic performances are recorded to reveal the specific functions of MOF and 3DGNs. The synergy between MOF, 3DGNs and TiO 2 is achieved by adjusting their mass fraction. Moreover, the average size of MOF exerts a significant influence on the resulting properties resulting from the scattering ability to incident light. After corresponding optimizing, the short circuit current, open circuit voltaic, fill factor and energy conversion efficiency reach 20.5 mAcm − 2 , 680 mV, 0.619% and 8.63%.
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Particuology
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2020
·
IF 2.787
Zhou Lan,Yangcheng Lu
In this work, we used the inert substances silicone oil and n -hexane to modulate the solvent environment, and in so doing tailor the preparation of magnesium ethoxide (Mg(OEt) 2 ) particles. We found the following: (1) nonpolar n -hexane mainly modulates the polarity of the solvent to control the precipitation rate and size of the Mg(OEt) 2 seeds, thereby triggering accelerated nucleation to form small primary particles; and (2) silicone oil (relatively high polarity and viscosity) facilitates the growth and agglomeration stage, to improve inter-particle dispersion and obtain relatively uniform Mg(OEt) 2 particles. We summarized these findings in a common mechanism for preparing Mg(OEt) 2 particles with uniform morphology, small size, and high bulk density as per the synergistic effect of n -hexane and silicone oil. The ratios of silicone oil and n -hexane are flexible, and afford various regular and well-dispersed Mg(OEt) 2 particles that are 5–30 μm in size and 0.2–0.7 g/cm 3 in bulk density. The nanoparticles thus have the potential to serve in diverse applications such as catalysis.
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高影响因子
MOLECULES
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2020
·Vol. 25
·期 5
·1157
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IF 3.267
Sha Cong,Wenjiang Dong,Jianping Zhao,Rongsuo Hu,Yuzhou Long,Xiaoxing Chi
The lipid oxidation process of Robusta green coffee beans was characterized during accelerated storage for 20 days at 40 °C, 50 °C, and 60 °C. The conventional oxidation indexes and fatty acid compositions were evaluated, and the shelf life of the green coffee beans was predicted using the Arrhenius model. The acid value, iodine value, peroxide value, total oxidation value, thiobarbituric acid reactive substances, and free fatty acid content increased throughout storage, while the moisture content,p-anisidine value, and unsaturated fatty acid content decreased, which suggests that lipid oxidation occurred during accelerated storage. The predicted shelf life of green coffee bean samples were 57.39 days, 44.44 days, and 23.12 days when stored at 40 °C, 50 °C, and 60 °C, respectively. This study provided scientific evidence of the impact of lipid oxidation on the loss of quality during the accelerated storage of green coffee beans.Keywords:green coffee beans;lipid oxidation;accelerated storage;shelf life prediction
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yanfeng He,Zhenyu Zhang,Weiyang Wang,Lipei Fu
Metal organic frameworks (MOFs) and reduced graphene oxide (RGO) are used to modify photoanodes of dyes sensitized solar cells (DSSCs) to improve their photovoltaic performances . The MOFs are found that bring about a significant enhancement of the BET area of photoanodes, which endows a high dye adsorption capacity. Moreover, the added MOFs introduces an improved incident photon to electron efficiency because of the remarkably enhanced scattering power for the incident light. On the other hand, in the presence of RGO provides a fast transport channel for photo-induced electrons, which depresses the dark current of the resulting devices. After optimizing the mass fraction of MOFs and RGO, the synergy has been achieved. Moreover, by using a graphene-based counter electrode, the photovoltaic performances of the resulting full-carbon DSSCs are detected. The short-circuit current, open-circuit voltage, fill factor (FF) and energy conversion efficiency ( η ) reach 18.6 mAcm −2 , 682 mV, 0.608 and 7.67%, indicating the potential application prospection of the as-prepared photoanodes.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Yuhang Wu,Yuanbo Xie,Fangyuan Zhong,Junkuo Gao,Juming Yao
It is of great significance to capture radioiodine from nuclear-related activities. Herein, We fabricated two kinds of hybrid aerogels composed with bimetal Hofmann-type metal-organic frameworks (Co–Fe) II (pz)[Ni II (CN) 4 ] and cellulose aerogels by in-situ growth and doping method (named CoFe@CA-IS and CoFe@CA-D, respectively). The hybrid aerogels possessed excellent iodine adsorption performance. The addition of (Co–Fe) II (pz)[Ni II (CN) 4 ] increased the porosity of the hybrid aerogels. The porosities of CoFe@CA-IS and CoFe@CA-D were reached 86.7% and 87.8%, respectively, which are higher than pure cellulose aerogels. Furthermore, the doping method provide a significant improve of adsorption performance. The equilibrium adsorption capacity of CoFe@CA-D reached 457.99 mg g −1 and the equilibrium adsorption capacity of CoFe@CA-IS was 194.34 mg g −1 . In addition, the hybrid aerogels showed excellent recycle ability, the equilibrium adsorption capacity of CoFe@CA-IS and CoFe@CA-D remained 81% and 91% after 5 cycles. The results suggested that this metal-organic framework@cellulose hybrid aerogel showed great potential in iodine treatment and could be applied in a wide field.
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JOURNAL OF CHROMATOGRAPHY A
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2020
·
IF 4.049
Yujie Zhang,Hui Zhong,Zi'ang Cao,Shouyong Zhou,Dabing Zhang,Renling Lu,Haifeng Han,Mingliang Zhang,Hongdeng Qiu
The present work described two triacontyl-bonded silica adsorbents containing different polar embedded groups ( i.e. amide- and carbamate-type) for high performance liquid chromatography, which were prepared by covalent surface modification of silica gel with respective pre-synthesized polar-embedded triacontyl (C30) silane. The acylimidazole-mediated method was used for the first time for the synthesis of amide-type alkyl silane, while the carbamate-type silane was obtained via an improved solvent-free procedure. A conventional C30 stationary phase was also developed on the same silica substrate in the similar manner, which was used as a reference column for comparison of the unique mechanisms facilitated and/or furnished by the polar groups. The successful immobilization of the designed C30 species was confirmed by infrared spectroscopy and elemental analysis. In further comparison with an amide-embedded octadecyl (C18) two other conventional C18 stationary phases of different surface chemistry, detailed chromatographic characterization of the C30 series stationary phases was performed in terms of surface density, hydrophobicity, aromatic selectivity, shape selectivity and water tolerance using a diversified range of analytes, including homologous alkylbenzenes, isomeric polycyclic aromatic hydrocarbons, carotenes, congeners of polychlorobiphenyls, aromatic amines, phenolic compounds, estrogens and nucleosides. A high resemblance between the chromatographic behaviors of the two polar-modified C30 stationary phases was observed, meanwhile they demonstrated noticeable differences from non-polar C30 stationary phase. The polar-embedded C30 phases showed satisfactory performance towards the solutes of interest in the studied conditions. The beneficial synergy of the polar groups and the triacontyl chains enabled these polar-enhanced C30 stationary phases to address challenging separation tasks with high selectivity.
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高影响因子
Materials
·
2020
·Vol. 13
·期 5
·1206
·
IF 3.057
Danni Zhang,Baolin Sun,Hui Huang,Yongping Gan,Yang Xia,Chu Liang,Wenkui Zhang,Jun Zhang
Solar-driven electrochromic smart windows with energy-storage ability are promising for energy-saving buildings. In this work, a flexible photoelectrochromic device (PECD) was designed for this purpose. The PECD is composed of two flexible transparent conductive layers, a photocatalytic layer, an electrochromic material layer, and a transparent electrolyte layer. The photocatalytic layer is a dye-sensitized TiO2thick film and the electrochromic layer is a WO3thin film, which also possesses a supercapacitive property. Under illumination, dye-sensitized TiO2thick film realizes photo-drive electrochromism that the WO3changes from colorless to blue with large optical modulation. Meanwhile, the PECD has an electrochemical supercapacitance showing an energy storage property of 21 mF·cm−2(114.9 F·g−1vs the mass of WO3), stable mechanical performance and long cycle performance. The PECD can effectively adjust the transmittance of visible and near-infrared light without any external power supply, realizing zero energy consumption, and can convert solar energy into electrical energy for storage.Keywords:photoelectrochromic devices (PECD);dye-sensitized solar cells (DSSC);electrochromic devices (ECD);smart windows;flexible devices
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高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 15
·3010-3015
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IF 5.344
Yanbin Sun,Xianwen Wang,Linxin Fan,Xianli Xie,Zhaohua Miao,Yan Ma,Tao He,Zhengbao Zha
The famous chromogenic reaction between starch and iodine has been widely used for chemical analysis since its first discovery in the year of 1814 while it is seldom utilized in biomedical applications. Inspired by their high iodine content and strong optical absorbance in the near infrared (NIR) region, monodisperse amylose–iodine nanoparticles (AM–I NPs), synthesized by simple mixing of amylose NPs and KI–I2 solutions, were explored as a new class of high-performance antibacterial agent. Benefiting from the broad-spectrum antibacterial property of iodine and photothermal effect of the amylose–iodine complex, the obtained AM–I NPs exhibited an excellent photothermal-enhanced sterilization effect for both Gram-negative Escherichia coli (E. coli) and Gram-positive methicillin-resistant Staphylococcus aureus (MRSA). For instance, upon incubation with AM–I NP suspensions (30 μg mL−1) plus NIR laser irradiation (808 nm, 1.33 W cm−2, 5 min), the relative survival rates of E. coli and MRSA were only 1.2% and 1.7%, respectively. In addition, the AM–I NPs depicted better biocompatibility in vitro than that of KI–I2 solution, indicating their safety for potential biomedical applications in vivo. This proof-of-concept study revealed the antibacterial applications of a traditional starch-iodine complex and is expected to provide insights into the design and development of efficient broad-spectrum antibacterial agents.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Qiyuan Zhou,Hongfeng Zhan,Bo Chen,Hai Li,Zhendong Huang,Yanwen Ma,Hua Zhang,Shaozhou Li,Xiao Huang,Wei Huang
Although ultrahigh theoretical capacity has long been predicted for boron-based lithium-ion battery anodes, experimentally, boron has exhibited only limited performance and its lithiation process remains elusive. The two-dimensional (2D) form of boron is believed to be an ideal model system to investigate the lithiation behavior of boron; however, unfortunately, most reported 2D boron structures are prone to oxidation under ambient conditions. In this contribution, through a simultaneous etching and in situ functionalization process, we synthesized for the first time methyl-functionalized boron nanosheets, which remain stable up to 250 °C. Combining experiments and theoretical calculations, we found that lithiation of boron is realized through the formation of alloys such as LiB3 and Li3B14, while alloys with higher Li content such as Li5B are thermodynamically less favored. In addition, detailed electrochemical analysis reveals that side reactions on the boron surface may also contribute to the unsatisfactory performance of boron-based electrodes. Our findings suggest that reducing the enthalpy of formation of high Li content alloys and the choice of a less nucleophilic electrolyte are key to developing high-performance anodes based on novel boron materials. Our demonstration of stable 2D boron structures also paves the way for their fundamental study and practical applications.
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高影响因子
Energy Technology
·
2020
·Vol. 8
·期 5
·1901171
·
IF 3.404
Pengqiang Yuan,Jihuai Wu,Weihai Sun,Qianjin Zhu,Mingjing Zhang,Jinjun Zou,Xiaobing Wang,Xuping Liu,Yuqian Yang,Zhang Lan
The p-type dopant of spiro-OMeTAD has been identified as a rational strategy for the enhancement of the hole transport ability in perovskite solar cells (PSCs). Herein, to enhance the conductivity and hole-extraction ability of spiro-OMeTAD, a low-cost and facile method is developed by introducing iodine into the hole transport materials. Morphology observation, energy gap characterization, and photoelectrochemical measurements indicate that as a mild Lewis acid, oxidant, and p-type dopant, iodine moderately oxidizes spiro-OMeTAD, optimizes the energy match with perovskite, mitigates the trap state density, interface resistance, and carrier recombination, and improves the hole-extraction ability and carrier transport capacity. Consequently, a planar PSC based on the spiro-OMeTAD doped with 8 wt% iodine achieves a champion power conversion efficiency (PCE) of 19.69%. Conversely, the device with pristine spiro-OMeTAD gets an efficiency of 18.04%. This work indicates a potential application of iodine as a promising p-type dopant for spiro-OMeTAD in PSCs.
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