Advanced Materials Interfaces
·
2018
·Vol. 5
·期 15
·1800515
·
IF 4.834
Lingxia Zheng,Wangwang Hu,Xuwei Shu,Huajun Zheng,Xiaosheng Fang
Cobalt phosphides based materials are considered as promising electrocatalysts for the hydrogen evolution reaction (HER). The catalytic performance can be further enhanced by improving the intrinsic catalytic activity, exposing more active sites and coupling with conductive support. Herein, a novel electrocatalyst based on nitrogen doped reduced graphene oxides decorates with uniformly distributed CoP x nanoparticles with a suitable P/Co ratio ( x = 1.7) via a facile and mild condition. The optimized composite (CoP x /N-rGO) exhibits superior electrocatalytic HER activities with a low overpotential of 104 mV (at 10 mA cm −2 ), a small Tafel slope of 65 mV dec −1 , and long-term stability in the alkaline media, comparable to the performance of other HER electrocatalysts. The remarkable HER performance can be ascribed to the good electrical conductivity of rGO and extra active sites created by nitrogen doping. In addition, the ultrafine nanostructure (average particle size ≈4 nm) and well-dispersed CoP x nanoparticles also help expose more active sites for electrocatalytic reactions, largely hindering the agglomeration and exfoliation. This work provides a versatile route on the design of multifunctional composite materials for renewable energy research with low cost and high activity.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Xiulei Fan,Zixuan Ma,Yefeng Zou,Jiaqiang Liu,Jun Hou
In recent years, tire wear particles (TWP), as the significant proportion of microplastics (MPs), has adsorbed much attention due to its widespread presence in aquatic ecosystem . Compared with typical MPs, TWP exists significant differences in composition, additives, characteristics and so on. With TWP and polypropylene (PP) as target MPs, Cd 2+ and Pb 2+ as target pollutants, the adsorption-desorption characteristics of heavy metal ions on original and aged MPs were studied. Compare with the PP, the S BET of TWP increased more significantly after the UV ageing process. Meanwhile, the zeta potential of TWP increased from −8.01 to −14.6 mV and PP from −5.36 to −9.52 mV, and the surface of the TWP were more negatively-charged. In addition, the hydrophilicity of MPs enhanced due to the increased oxygen-containing functional groups after ageing process. Compared with PP, the physicochemical properties of TWP changed more obviously during UV ageing processes. The adsorption results showed that the pseudo-second-order model could better describe the adsorption processes of Cd 2+ and Pb 2+ on MPs. Meanwhile, the orders of adsorption capacity of MPs for Cd 2+ and Pb 2+ were aged TWP > aged PP > original TWP > original PP. The phenomenon of adsorption confirmed that TWP had better vector effects for heavy metal ions than PP, and the ageing processes could enhance the adsorption capacity of MPs. Moreover, the desorption results demonstrated that, compared with PP, the TWP (with higher adsorption capacity) also had the better desorption capacity for heavy metal ions in simulated gastric fluid. Compared with PP, the TWP might cause a more serious hazard to aquatic environment and organisms. These investigations would contribute to assessing the potential environmental and biological risk of TWP, especially considering the effect of the ageing process.
研究领域:
环境科学
·
生态毒理学
·
微塑料污染
·
水生生态系统
·
环境化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wanlin Qin,Xianliang Li,Yuchi Zhang,Le Han,Zhijin Cheng,Zhijie Li,Yan Xu
The development of electrocatalysts that show multifunctionality towards efficient sensing and energy applications are of great significance. Herein, we report a rational design of photochemical deposition of Ag nanoparticles (Ag NPs) on ZIF-67-decorated carbon nanotube (Ag NPs/ZIF-67 @CNT) hybrid, which exhibits dual-functional capabilities for both effective enzymeless glucose detection and electrocatalytic water oxidation . The distribution of Ag NPs on the ZIF-67-functionalized CNT can be optimized by adjusting the concentration of Ag + aqueous solution during the light illumination process. The optimized Ag NPs/ZIF-67 @CNT composite showed superior glucose-sensing capability with a low determination limit of 0.46 μM (S/N = 3), high sensitivity of 469.4 μA·mM −1 ·cm −2 , wide linearity detection range (0.010–7.0 mM) and short response time (less than 5 s). Also, the Ag NPs/ZIF-67 @CNT composite acting as potential electrocatalyst possessed an overpotential of 286 mV with a Tafel-slope of 80.75 mV dec −1 at 10 mA·cm −2 for high durability water-oxidation reaction. This work provided a feasible way to prepare Ag NPs decorated ZIF-67/CNT with modulated bifunctional catalytic performances via photochemical reduction strategy, which can also provide effective guidance for designing other multifunctional electrocatalysts .
研究领域:
材料科学
·
电化学
·
生物传感
·
能源催化
·
纳米医学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 49
·期 7
·10265-10272
·
IF 5.532
Wenchao Xi,Boxue Song,Zhengyu Sun,Tianbiao Yu,Jun Wang,Qi Sun
To improve the wear resistance of Fe-based cladding, NbC particles with different morphology are generated in situ by adding Nb, Cr 3 C 2 and C with different content. The composition of samples and the morphology of NbC particles generated in situ are revealed by XRD , SEM and EDS. The wear resistance is studied by a reciprocating friction and wear testing machine. The wear mode and the wear mechanism of each sample are investigated. The results show that although NbC particles are generated in situ in samples with different Nb, Cr 3 C 2 and C content, the morphology of NbC particles is varied. The wear resistance of samples containing cross-shaped NbC particles is more outstanding than that of samples containing only rectangular NbC particles. In addition, changing Nb, Cr 3 C 2 and C content does not result in a change in wear mode, but leads to the formation of continuous lattice structure of Cr 0.19 Fe 0.7 Ni 0.11 and Cr 23 C 6 compounds at grain boundaries and a change in the wear resistance. When the additions of Nb, Cr 3 C 2 and C are 11.2 wt%, 8.6 wt% and 0.2 wt% respectively, the coefficient of friction of the sample is the lowest, and the wear resistance is the most outstanding.
研究领域:
材料科学
·
金属学与热处理
·
表面工程
·
摩擦学
·
复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2016
·
IF 2.265
Yimin Wu,Ilia Korolkov,Xvsheng Qiao,Xianghua Zhang,Jun Wan,Xianping Fan
A rapid injection approach is used to synthesize the copper selenide nanoparticles and two-dimensional single crystal nanoplates . This technique excludes the use of toxic or expensive materials, increasing the availability of two-dimensional binary chalcogenide semiconductors. The structure of the nanocrystals has been studied and the possible formation mechanism of the nanoplates has been proposed. The optical absorption showed that the nanoplates demonstrated wide and tuneable absorption band in the visible and near infrared region . These nanoplates could be interesting for converting solar energy and for nanophotonic devices operating in the near infrared .
研究领域:
材料科学
·
纳米科技
·
半导体材料
·
光电子学
·
能源材料
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2013
·Vol. 34
·期 16
·1319-1324
·
IF 4.929
Chaohong Zhang,Ci Song,Wantai Yang,Jianping Deng
This communication reports the first gold nanoparticles (NPs) chirally functionalized with optically active helical substituted polyacetylene (the resulting hybrid particles are defined as Au@PPA NPs). The novel nanoparticles consist of gold as core and optically active helical poly( N -propargylamide) as shell and show considerable optical activity derived from helical poly( N -propargylamide) chains with predominantly one-handed screw sense. The Au@PPA NPs are prepared by a three-step approach: i) a thiol-containing N -propargylamide monomer [M th , HC≡CCH 2 NHCO(CH 2 ) 10 SH] is synthesized and characterized with FTIR and 1 HNMR spectroscopy and elemental analysis; ii) a copolymer (poly(M th - co -M ch )) was prepared by starting from monomer M th and another chiral N -propargylamide monomer (M ch ); poly(M th - co -M ch ) formed helical conformations and showed optical activities; and, iii) Au@PPA NPs are prepared from hydrogen tetrachloroaurate (III) and poly(M th - co -M ch ) through a one-spot procedure by using LiBH 4 as reducing agent. The as-obtained hybrid nanoparticles are characterized by FTIR spectroscopy, TEM, UV-vis absorption and circular dichroism (CD) techniques. UV-vis and CD measurements demonstrated the remarkable optical activity of the Au@PPA NPs. More interestingly, the Au@PPA NPs show much stronger UV-vis and CD sigals when compared to the corresponding orginal helical copolymer, poly(M th - co -M ch ). The chiral hybrid nanoparticles demonstrate different absorption toward (R)-(+)- and (S)-(−)-1-phenylethylamines, preferentially adsorbing the (S)-isomer.
研究领域:
纳米医学
·
生物材料
·
分子识别
·
药物递送
·
化学生物学
✓ 已验证
DOI
高影响因子
Journal of Oceanology and Limnology
·
2021
·Vol. 39
·期 5
·1622-1633
·
IF 1.265
Qu Yang,Xu Kuidong,Li Tao,Wang Maoyu,Zhong Huan,Chen Tianyu
The ocean is an important inventory of anthropogenic mercury (Hg), yet the history of anthropogenic Hg accumulation in the ocean remains largely unexplored. Deep-sea corals are an emerging archive of past ocean chemistry, which take in sinking or suspended particulate organic matter as their food sources. Such organic matter would exchange Hg with the local seawater before being consumed by the deep, sea corals. As such, the organics preserved in the coral skeleton may record the Hg evolution of the ambient seawater during the time of coral growth. Here, we report the first data on Hg concentrations variability of a deep-sea proteinaceous coral in the oligotrophic North Pacific at the water depth of 1 249 m, in attempt to understand the transfer of anthropogenic Hg into the deep Pacific ocean over the last seven centuries. We find that the Hg concentrations of different coral growth layers have remained relatively constant albeit with considerable short-term variability through time. The overall stable Hg concentration of the last seven centuries recorded in our sample suggests that anthropogenic pollution is not yet a clearly resolvable component in the deep oligotrophic North Pacific waters, in agreement with recent estimation from modelling works and observational studies of modern seawater profiles. As there is hardly an unambiguous way to separate anthropogenic Hg from the natural background based on recent seawater profiles, our historical data provide valuable information helping to understand the oceanic cycle of Hg through time.
研究领域:
海洋地球化学
·
环境科学
·
古气候学
·
生物地球化学循环
·
深海生态学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Quan-Yong Cheng,Xiao-Li Zhao,Yi-Dong Li,Yun-Xuan Weng,Jian-Bing Zeng
Traditional superhydrophobic cotton fabrics (SCFs) for oil/water separation were usually fabricated by surface coating with inorganic nanoparticles combined with nonrenewable and nonbiodegradable or even toxic fossil-based chemicals, which would lead to secondary environmental pollution after their lifetime. In this study, we report robust, nanoparticle-free, fluorine-free SFC, which was prepared by acid etching followed by surface coating with epoxidized soybean oil resin (CESO) and subsequent modification with stearic acid (STA). No toxic compound and no nanoparticle were included within the SCF and all the raw materials including cotton fabric, CESO and STA are biodegradable and derived from biological resources. The SCF showed excellent mechanical stability and chemical/environmental resistances. The superhydrophobicity of the SFC survived from mechanical abrasion , tape peeling, ultrasonication , solvent erosion and low/high temperature exposure. The SCF also exhibited good acid/alkali resistance with contact angle over 150° toward different pH water droplets. Moreover, the SCF could efficiently separate oil/water mixtures with efficiency above 97.9% and the superhydrophobicity remained after reusing for at least 10 times. The fully biological-derived SCF with excellent mechanical and chemical resistances exhibit great potential for separation of oil/water mixtures.
研究领域:
材料科学
·
环境工程
·
高分子化学
·
表面科学
·
可持续技术
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Xiaoyan Liu,Guojun Lan,Panpan Su,Lihua Qian,Tomas Ramirez Reina,Liang Wang,Ying Li,Jian Liu
The hydrogenation of levulinic acid to γ-valerolactone with water as solvent is a crucial reaction for producing fine chemicals. However, the development of highly stable catalysts is still a major challenge. Here, we prepared a Ru nanoparticles incorporated in mesoporous-carbon (Ru-MC) catalyst to achieve high stability in acidic aqueous medium. The Ru-MC showed excellent catalytic performance (12024 h −1 turnover frequency) in the hydrogenation of LA-to-GVL. Compared with Ru supported on mesoporous carbon catalyst (Ru/MC) prepared by conventional wet impregnation method, the Ru-MC showed excellent reusability (more than 6 times) and thermal stability (up to 600 °C). Based on H 2 -TPR-MS characterization, it was proposed that the incorporated structure significantly increased the interaction between Ru nanoparticles and carbon support, which effectively prevent the leaching and sintering of Ru nanoparticles and contributed to increased high reusability and thermal stability of the Ru-MC.
研究领域:
催化化学
·
绿色化学
·
生物质转化
·
纳米材料
·
能源化学
·
有机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2015
·Vol. 33
·期 9
·927-932
·
IF 1.261
Hailong PENG,Qiangsheng GAO,Lili MENG,Lixia ZHANG,Qi PANG,Lifang LIANG
Ca 12 Al 14 O 32 F 2 :Eu 3+ red phosphors were prepared by the sol-gel method with CF 3 COOH as the fluorine source. X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectra, and photoluminescence spectra, as well as thermogravimetric and differential thermal analysis were utilized to characterize the samples. All the samples were single phase with a cubic structure. The as-obtained Ca 12 Al 14 O 32 F 2 :Eu 3+ red phosphors consisted of nanoparticles with sizes of approximately 40–100 nm. Under the excitation of UV light, Ca 12 Al 14 O 32 F 2 :Eu 3+ exhibited the characteristic emissions of Eu 3+ , and the effect of annealing temperature, annealing time, and CF 3 COOH and Eu 3+ concentrations on the luminescence intensity were discussed in detail.
研究领域:
材料科学
·
无机化学
·
发光材料
·
纳米材料
·
固体化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 68
·38850-38859
·
IF 2.936
Yaozu Guo,Dong Zhao,Junhua You,Wenli Pei,Yingdong Qu,Xiaoyang Wang,Qingyu Meng
Nd2Fe14B nanoparticles were successfully prepared by using a low-energy chemical method. The microscopic characteristics and formation mechanisms of the phases were investigated at each stage during the preparation of Nd-Fe-B nanoparticles. The Nd-Fe-B intermediates, Nd-Fe-B oxides and reduced Nd-Fe-B nanoparticles were detected and analyzed by using TEM, STEM, XRD, SEM, VSM and Rietveld calculations. The results showed that the intermediate of Nd-Fe-B consisted of Fe3O4 and Nd and Fe elements surrounded by nitrile organic compounds. The Nd-Fe-B oxide was composed of NdFeO3 (48.619 wt%), NdBO3 (31.480 wt%) and α-Fe (19.901 wt%), which was formed by the reaction among Nd, Fe3O4 and B2O3. NdFeO3 and NdBO3 exhibited a perovskite-like lamellar structure, and the grain size was smaller than that of α-Fe. Nd-Fe-B particles were mainly composed of Nd2Fe14B and α-Fe phases. The small particles of NdFeO3 and NdBO3 and the interstitial position between oxide particles and α-Fe were more favorable for the formation of Nd2Fe14B particles. At the same time, the surface of α-Fe particles can also diffuse to form Nd2Fe14B nanoparticles. The coercivity of Nd-Fe-B particles was 5.79 kOe and the saturation magnetization was 63.135 emu g−1.
研究领域:
材料科学
·
纳米材料
·
磁性材料
·
无机非金属材料
·
固体化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 307
·期 2
·2100649
·
IF 4.367
Han-Qing Tao,De-Wei Yue,Cheng-Hui Li
Magnetic actuators, which use magnetic effects for actuation, are very useful in many areas, such as electrical equipment, soft robots, and medical instruments. However, they inevitably suffer damage during long-term use, leading to mechanical failure. Introduction of the self-healing concept can solve this problem to a certain extent and extend their service life. Herein, a room-temperature self-healing magnetic nanocomposite is obtained using a simple, efficient, and environmental-friendly strategy. In the authors' design, soft poly(dimethylsiloxane) (PDMS) polymeric materials are chosen as the matrix, and Fe 3 O 4 nanoparticles are utilized as a functional magnetic nanofiller to obtain a new magnetic nanocomposite. By balancing the self-healing property and mechanical performance, the optimal content of magnetic filler is determined to be 15 wt%. The optimized sample exhibits an ultimate tensile strength (0.44 MPa), a high tensile strain (400%), and an excellent self-healing efficiency (62.2% mechanical recovery of fracture strength) at 25 °C for 30 min. Furthermore, this composite material shows an excellent and healable magnetic actuation performance. This new nanocomposite provides great potential for the magnetic actuation application.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
软体机器人
·
功能高分子材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）