Polymers
·
2023
·Vol. 15
·期 7
·1655
·
IF 5
Yongzheng Zhao,Yan Li,Jiaxuan Li,Yifan Xiao,Wenmin Mu,Zhongwei Wang,Liang Song,Jinhong Yu
Few-layer black phosphorus (BP)- and red phosphorus (RP)-modified diglycidyl ether of bisphenol A-based epoxy resins (EP) was prepared with 4,4′-diaminodiphenylsulfone as a curing agent. The thermal stability and flame-retardant properties of the modified EPs were compared. Both BP and RP were able to improve the flame-retardant properties of EPs, while the BP showed higher flame-retardant efficiency than RP. As a two-dimensional nanomaterial, BP exhibited good compatibility, high flame-retardant efficiency, and negligible impact on the mechanical and thermal stability of EP. Pyrolysis-gas Fourier-transform infrared spectroscopic analysis of EP showed that the addition of BP significantly inhibited the release of pyrolysis products in the gas phase. The modes of action for flame-retardant BPs in gas phase and condensed phase were proposed.Keywords:few-layer black phosphorus;flame retardant;epoxy resin
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2022
·
IF 0.672
Peimiao Deng,Weiguang Xie,Junlong Chen,Honglong Ning,Xiao Fu,Xu Zhang,Weijian Yuan,Yiping Wang,Rihui Yao,Junbiao Peng
Stannous oxide (SnO) is prepared by a sol–gel reaction, and the intermediate product is a white gel material, Sn6O4(OH)4, which is decomposed by a constant temperature heat treatment to form a regular black crystal, and the size reach 300 μm approximately. TG-DSC analysis shows that under air atmospheric conditions, SnO undergoes an oxidation and thermal decomposition reactions at 350 °C, which to form SnO2, Sn, and Sn3O4. With the temperature increasing, the reaction will continue and the final product will be SnO2. X-ray photoelectron spectroscopy (XPS) analysis shows that SnO is sensitive to oxygen. It is placed in air for about 2 months, and 81.8% of the crystal surface is oxidized to SnO2, but the inside of the crystal remains as SnO. Few layer crystal sheets was prepared by mechanical exfoliation with a thickness of 85 nm and a surface roughness of 1.02 nm, which provides a possibility for the application of few layers of SnO crystals to transparent and flexible electronic devices.
研究领域:
材料科学
·
表面科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jianfa Chen,Ting Zhu,Xiangping Fu,Guangyuan Ren,Chunyan Wang
A hydrothermal/calcination method was successfully applied to prepare ultrafine tin dioxide (SnO2)/few-walled carbon nanotube (FWNT) composites (SnO2@FWNT). The corresponding morphological and structural information were further obtained by the characterization technique of transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. In the SnO2@FWNT composites, ultrafine SnO2 nanoparticles with an average size of 2-3 nm were uniformly distributed on the FWNT with a thickness of 2-5 layers. With the synergistic effect of highly conductive FWNT and highly dispersed SnO2, the SnO2@FWNT hybrids presented excellent specific capacitance of 220.5 F g -1 at a scan rate of 2 mV s -1 under neutral environment. A power density of 30.63 kW kg -1 and an energy density of 512.79 W kg -1 were obtained, respectively. In addition, a specific capacity retention rate of 89.57% was acquired after 1000 cycles, indicating a superior stability of SnO2@FWNT hybrids. The results indicate that the SnO2@FWNT composites can be used as an alternative electrode material for high-performance supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Tianzhao Hu,Jiafu Chen,Xiaoqing Lu,Jing Chen,Zhimin Chen,Jianwei Fu,Yong Chen
Graphene sheets have a vast number of potential applications due to their excellent properties. However, poor quality and harsh preparation conditions restrict their application. Here, few-layer graphene (FLG) sheet powder with high quality has been synthesized from waste expanded polystyrene (EPS) at low temperature by dense Fe cluster catalysis. The micron-sized FLG sheets comprising about three layers show high crystallinity and good electrical conductivity that are comparable to those of the shear-exfoliated graphene nanoplatelets. More than 70% carbon yield of FLG sheets from cheap EPS and their safe, controllable synthesis conditions make it easy to expand production. The catalytic formation mechanism of FLG sheets is studied.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Royal Society Open Science
·
2020
·Vol. 7
·期 7
·
IF 2.646
Dianzhan Wang,Ye Gu,Zhaoshun Yang,Lixiang Zhou
Schwertmannite (sch), an iron oxyhydrosulfate mineral, can catalyse a Fenton-like reaction to degrade organic contaminants, but the reduction of Fe(III) to Fe(II) on the surface of schwertmannite is a limiting step for the Fenton-like process. In the present study, the sch/few-layer graphene (sch–FLG) composite was synthesized to promote the catalytic activity of sch in a Fenton-like reaction. It was found that sch can be successfully carried by FLG in sch–FLG composite, mainly via the chemical bond of Fe–O–C on the surface of sch–FLG. The sch–FLG exhibited a much higher catalytic activity than sch or FLG for the degradation of sulfamethazine (SMT) in the heterogeneous Fenton-like reaction, which resulted from the fact that the FLG can pass electrons efficiently. The degradation efficiency of SMT was around 100% under the reaction conditions of H2O2 200–500 mg l−1, sch–FLG dosage 1–2 g l−1, temperature 28–38°C, and initial solution pH 1–9. During the repeated uses of sch–FLG in the Fenton-like reaction, it maintained a certain catalytic activity for the degradation of SMT and the mineral structure was not changed. In addition, SMT may be finally mineralized in the Fenton-like reaction catalysed by sch–FLG, and the possible degradation pathways were proposed. Therefore, the sch–FLG is an excellent catalyst for SMT degradation in a heterogeneous Fenton-like reaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 7
·075708
·
IF 3.404
Hengcong Tao,Jingjing Ding,Chao Xie,Yunnan Gao,Jinliang Song,Zhenyu Sun
We demonstrate a facile and versatile method to grow Ru particles uniformly on pristine few-layer graphene (FLG) in supercritical diethylamine. In particular, a large number of Ru subnanometer clusters less than 1.0 nm were observed. The particle size can be tuned by manipulating the loading content of Ru and controlling the reaction temperature. The resulting Ru/FLG showed remarkably high activity, selectivity, and reusability towards the hydrogenation of levulinic acid to γ-valerolactone. This method is flexible, and can be extended to the synthesis of a variety of other ultrafine metal particles supported on FLG.
研究领域:
材料科学
·
催化化学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Baihua Long,Genping Yan,Hongmei He,Sugang Meng
Two-dimensional polymeric carbon nitride (PCN) is a promising semiconductor for photocatalytic redox reactions. Herein, we report a straightforward, scalable, and low-cost production approach to prepare porous and few-layer PCN nanosheets by a steam etching of pristine bulk PCN that was attained from thermal polymerization of guanidinium thiocyanate. By optimization of the supplied amount of water steam, reaction temperature, and time of the steam etching process, the obtained porous and few-layer PCN nanosheets showed drastically increased photocatalytic activity with a hydrogen evolution rate of 0.658 mmol·g–1·h–1, which is 18.3-fold higher than that of pristine bulk PCN (0.036 mmol·g–1·h–1). They also exhibit an outstanding activity and a high stability for the degradation of dyes under visible-light irradiation. Moreover, the proposed steam etching method can also be expanded to other guanidinium precursor salts for the preparation of their corresponding porous and few-layer PCN nanosheets. As such, the steam etching strategy may stand out as an extremely simple method to prepare porous and few-layer PCN nanosheets with remarkably enhanced photocatalytic performances.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Q. Yan,B. Chen,B. Zhang,T. Zhang,J. Wan,J. Shen,H.C. Kou,J.S. Li
The high reaction tendency between graphene and titanium (Ti) matrix during fabrication of graphene/Ti composites aggravates the structural integrity of graphene and limits its outstanding strengthening potential. In order to solve this problem, in this study, few-layered graphene (FLG) decorated with SiC nanoparticles (SiCp@FLG) was synthesized to reinforce Ti-6Al-4V (Ti64) alloy via a powder metallurgy route. Microstructure and Vickers hardness of the developed SiCp@FLG/Ti64 composites were studied systematically. Results showed that the SiCp decoration changed the morphology of FLG/Ti interface from continuous TiC reaction layer to discontinuous TiC nanoparticles during hot-press sintering. This discontinuous interface not only kept the integrity of FLG by suppressing its reaction with Ti matrix but also led to direct bonding between FLG and Ti. This designing strategy of protecting the reinforcement by secondary particle decoration can be potentially applied to the development of high-performance metal matrix composites .
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Zhang Zhiliang,Jin Hailun,Wu Chenyu,Ji Jianbing
Graphene, a two-dimensional nanomaterial, has shown tremendous promising applications in a broad range of fields. Mass production of defect-free graphene is a prerequisite for its applications. In this work, by using a needle valve, we propose a simple hydrodynamic-assisted exfoliation method to produce high-quality few-layer graphene flakes. The prepared graphene flakes, with an average layer of 5 (~ 71% less than five layers) and a Raman D/G intensity ratio as low as 0.1, are free of defects and oxidation. The average thickness and length of the few-layer graphene flakes are 2.3 nm (~ 90% < 4 nm) and 1.9 μm (~ 50% in the range of 1–7 μm), respectively. In a lab-scale trial, the concentration of graphene can reach 0.40 g/ml under mild operating conditions (working pressure 20 MPa, 16 cycles), and the corresponding production rate is 0.40 g/h. The hydrodynamic-assisted exfoliation by needle valve potentially offers a simple and efficient method for large-scale production of high-quality graphene.
研究领域:
纳米材料科学
·
材料化学
·
化学工程
·
二维材料
·
工业催化
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-7
·
IF 3.125
Hu Yiwei,Hao Qiaoyan,Zhu Baichuan,Li Biao,Gao Zhan,Wang Yan,Tang Kaibin
Tantalum disulfide nanosheets have attracted great interest due to its electronic properties and device applications. Traditional solution-ased ultrasonic process is limited by ultrasound which may cause the disintegration into submicron-sized flake. Here, an efficient multi-step intercalation and ultrasound-free process has been successfully used to exfoliate 1T-TaS 2 . The obtained TaS 2 nanosheets reveal an average thickness of 3 nm and several micrometers in size. The formation of few-layer TaS 2 nanosheets as well as monolayer TaS 2 sheets is further confirmed by atomic force microscopy images. The few-layer TaS 2 nanosheets remain the 1T structure, whereas monolayer TaS 2 sheets show lattice distortion and may adopt the 1H-like structure with trigonal prism coordination.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9543-9549
·
IF 2.22
Liu Wanying,Zhu Yabo,Xu Xiang,Wang Shasha,Zhang Xinxi
The wet ball milling (WBM) method is, for the first time, used for the exfoliation of bulk black phosphorus (BP) to obtain few-layer black phosphorus (FBP). Before that, the rational solid–liquid ratio of raw material is determined to be 1:1 (mg/mL) for the popular ultrasound liquid exfoliation (ULE). Obviously, the high proportion of organic solvent used in ULE will lead to serious environmental pollution. Compared with ULE, the solid/liquid ratio for WBM exfoliation is 100:1 (mg/mL) showing its advantage of less demand for organic solvent. In addition, different types of organic solvents are used to determine the proper organic solvent for WBM exfoliation. Ultraviolet–visible–near-infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and laser particle size analyzer are used to comprehensively characterize the layer numbers, morphology size, and phase structure of FBP yielded by WBM exfoliation. The results show that dimethyl sulfoxide (DMSO) is the suitable organic solvent for BP exfoliation; FBP flakes with 3–5 layers and micron size are obtained by WBM exfoliation.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Xiaohao Sun,Minfang Chen,Debao Liu
In this study, few-layer graphene oxide (FLGO) reinforced Mg matrix composite was successfully fabricated by the hetero-agglomeration method and spark plasma sintering (SPS) process. The microstructure, mechanical properties , and strengthening behavior of these composites were comprehensively investigated. A unique amorphous MgO/ultrafine MgO + reduced FLGO/amorphous MgO sandwich-like grain boundary of the α-Mg matrix grain was confirmed in FLGO/Mg matrix composites. This kind of grain boundary indicated the strongly interfacial bonding between the reduced FLGO and Mg matrix. The low mismatch between the d{2 0 0} MgO and d{1 0 0} graphene and the instantaneous elevated temperature during the SPS process could contribute to the formation of these unique grain boundaries. The mechanical strength and Vickers hardness were apparently increased with increasing FLGO concentration. The 0.5 vol%FLGO/Mg composite exhibits the maximum increase in the mechanical properties. The uniaxial compressive strength (UCS) of 373.2 MPa, yield strength (YS) of 140.7 MPa, failure strain of 14.9% and Vickers hardness of 57.6 was achieved in this composite. Quantitative analysis of the strengthening behavior in these composite was performed, and a high strengthening efficiency was achieved in the FLGO/Mg matrix composites. Therefore, FLGO could be considered as a promising candidate as reinforcement for the Mg matrix.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）