Defence Technology
·
2021
·Vol. 18
·期 10
·1852-1862
·
IF 3.172
Fa-yang Guan,Hui Ren,Wan-jun Zhao,Xin-zhou Wu,Qing-jie Jiao
To improve the thermal properties of aluminum (Al) in the energetic system, a coated structure with ammonium perchlorate (AP) was prepared by a facile approach. And N, N-Dimethylformamide (DMF) was chosen as an ideal solvent based on heterogeneous nucleation theory and molecular dynamics simulation. This coated structure could enlarge the contact area and improve the reaction environment to enhance the thermal properties. The addition of AP could accelerate oxidation temperature of Al with around 17.5 °C. And the heat release of 85@15 composition rises to 26.13 kJ/g and the reaction degree is 97.6% with higher peak pressure (254.6 kPa) and rise rate (1.397 MPa/s). An ideal ratio with 15 wt% AP was probed primarily. The high energy laser-induced shockwave experiment was utilized to simulate the reaction behavior in hot field. And the larger activated mixture of coated powder could release more energy to promote the growth of shockwave with higher speed up to 518.7 ± 55.9 m/s. In conclusion, 85@15 composition is expected to be applied in energetic system as a novel metal fuel.
研究领域:
材料科学
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能源化学
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热力学
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纳米材料
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燃烧学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Zhaoping Chen,Qin Wang,Ziyao He,Jiaming Li,Enrou Mei,Xiaojuan Liang,Weidong Xiang
CsPbX 3 (X = Cl, Br, I) perovskites have emerged as promising candidate lasing materials due to their high optical gain , low defect state density, and high absorption coefficient. Unfortunately, they suffer from poor stability, particularly with respect to temperature, moisture, and light exposure, preventing their use in practical optoelectronic applications , such as for amplified spontaneous emission (ASE) with an ultralow laser threshold. Herein, CsPbBr 3 @MCM-41 molecular sieve (CMM) composites are controllably prepared by different ultrasonication and stirring treatments. In addition, different perovskite concentrations and heat-treatment conditions are also considered to demonstrate the ASE behaviors. In addition, CMM@PS (CMMP) and CMM@AB (CMMA) composites were fabricated successfully by further optimizing the mixing ratio of CMM and the polymer. More excitingly, the stability of the CMM@polymer films with respect to the external environment is greatly improved after the polymer coating . To our surprise, the CMM@ploymer thin films demonstrated ASE at room-temperature, with an ASE threshold as low as 0.136 mJ/cm 2 and 0.049 mJ/cm 2 for CMMA and CMMP, respectively. These results clearly shed light upon the control and optimization of CsPbBr 3 perovskite composite films , paving the way for their widespread use in optoelectronic applications .
研究领域:
光学材料
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纳米复合材料
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光电子学
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激光物理
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功能薄膜
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Hu Qu,Bizhou Lin,Liwen He,Xiaorong Fan,Yi Zhou,Yilin Chen,Bifen Gao
TaWO 6 nanosheet was assembled into multilayer films by a layer-by-layer deposition technology with polyethylenimine as the linker. UV–vis absorption spectra in the assembly process showed a linear enhancement of absorbance at 238 nm per deposition cycle, indicating the successful formation of multilayer composite films, which were converted into polymer-free films by the heat treatment at 400 °C for 2 h. The bandgap energy and flatband potential of TaWO 6 nanosheet were estimated to be 3.48 eV and −0.79 V vs. Ag/AgCl, respectively. The photoelectrocatalytic degradation of Rhodamine B with the TaWO 6 nanosheet electrodes demonstrated that both the oxygen anionic radicals and the dye cationic radical are essential to mineralize the dye under visible-light-driven photocatalytic conditions. It is the first time to investigate the mechanism of photoelectrocatalysis of TaWO 6 nanosheet electrode.
研究领域:
材料科学
·
物理化学
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环境催化
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纳米科技
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能源材料
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 44
·1902819
·
IF 10.856
Xiaojun Ruan,Jiangjiang Luo,Rui Wang,Yanbo Yao,Jingjiao Guan,Tao Liu
A nanometer-thick carbon film with a highly ordered pattern structure is very useful in a variety of applications. However, its large-scale, high-throughput, and low-cost fabrication is still a great challenge. Herein, microcontact printing (µCP) and direct laser writing carbonization (DLWc) are combined to develop a novel method that enables ease of fabrication of nanometer-thick and regularly patterned carbon disk arrays (CDAs) and holey carbon films (HCFs) from a pyromellitic dianhydride-oxydianiline-based polyamic acid (PAA) solution. The effect of PAA concentration and pillar lattice structure of the polydimethyl siloxane stamp are systematically studied for their influence on the geometrical parameter, surface morphology, and chemical structure of the finally achieved CDAs and HCFs. Within the PAA concentration being investigated, the averaged thickness of CDAs and HCFs can be tailored in a range from a few tens to a few hundred of nanometers. The µCP+DLWc-enabled electrically conductive CDAs and HCFs possess the characteristics of ease-of-fabrication, nanometer-thickness, highly regular and controlled patterns and structures, and the ability to form on both hard and soft substrates, which imparts usefulness in electronics, photonics, energy storage, catalysis, tissue engineering, as well as physical, chemical, and bio-sensing applications.
研究领域:
材料科学
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纳米科技
·
生物医学工程
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表面化学
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微纳加工
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Chen Jiang,Kun Zhao,Cheng Fu,LiZhi Xiao
The content, morphology, and structure of precipitated wax crystals are major factors affecting crude oil rheology. In this paper, model oils obtained by dissolving a realistic mixture of long-chain n-octacosane in diesel fuels were studied using terahertz time-domain spectroscopy (THz-TDS) and microscopy to gain insight into clusters composed of asphaltene and wax with increasing wax content. The fractal dimension was used for quantitative characterization of the morphology and structure of clusters in the model oils. From the measured absorption and extinction coefficients in the THz region, dynamic processes of the clusters in the model oils were analyzed and identified. The extinction coefficient in the THz region strongly depended on the dispersed and aggregated states of the asphaltene and wax crystals. These observations suggest that the aggregation state of the particles in model oils can be monitored with THz-TDS. In the future, THz-TDS technology may be used to effectively analyze particle dispersion or the aggregation state in crude oil and may thus be useful for rapid assessment of the effect of pour-point depressant on wax crystal aggregates.
研究领域:
石油化学
·
流变学
·
光谱分析
·
胶体与界面科学
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 23
·14624-14633
·
IF 3.442
Huang Junxian,Chen Heng,Hao Beibei,Dai Wei,Chen Shaojun
In this contribution, copolymerization strategy was reported to prepare polymethyl methacrylate (PMMA)-based ultraviolet (UV) shielding copolymers where polymerizable UV absorbers were synthesized and further copolymerized with methyl methacrylate. The copolymer was characterized by 1 H NMR, GPC, TGA, and UV–Vis spectroscopy. The prepared copolymer was found to exhibit high thermal stability compared with its blending counterparts, along with quite a high UV shielding efficiency demonstrated by the fact that full-band UV blocking was achieved when only 2% UV absorbers were added to copolymer. Furthermore, this copolymer also obtained high quantum yield luminescence that emitted bright blue light under UV irradiation. Given its good stability, high UV blocking efficiency, and outstanding luminescence property, the prepared PMMA copolymer is expected to have promising potential in UV shielding and photovoltaic applications.
研究领域:
高分子化学
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材料科学
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光功能材料
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能源材料
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纳米复合材料
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 18
·6848-6855
·
IF 3.069
Xiaoting Huang,Haiyang Liu,Jiewen Zhang,Boren Xiao,Fengxu Wu,Yueying Zhang,Ying Tan,Yuyang Jiang
A dicyanoisophorone-based near-infrared fluorescent probe (NIR-NP) was successfully designed for hydrogen sulfide (H2S) detection. 7-Nitro-1,2,3-benzoxadiazole (NBD) amine, an electron-withdrawing group, was applied to quench the fluorescence of dicyanoisophorone-based fluorescent dyes and could be removed by H2S-specific thiolysis of an NBD amine bond, leading to a significant fluorescence turn-on response. The probe could quantitatively detect H2S with a lower detection limit (0.03 μM) in vitro and in living cells. The probe with a large Stokes shift (186 nm) showed a high selectivity to H2S in the presence of other biothiols, including glutathione, homocysteine, and cysteine. Moreover, the probe was successfully applied to image endogenous H2S in different tumor cells and in liver tissues. The excellent properties of the probe and its applications in cell and tissue imaging indicated its potential for further exploration and application of H2S in the pathophysiology of cancers and even in the diagnosis of H2S-related diseases.
研究领域:
分子影像学
·
肿瘤学
·
化学生物学
·
分子生物学
·
生物分析化学
·
转化医学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Tianqi Liu,Xuejuan Wan,Youwei Yao
A Rhodamine B based dual-response sensor was developed for the independent sensitive and selective fluorescence sensing of Pb 2+ and Al 3+ . Initially, TQ1 exhibited one major fluorescence emission peak centered at 461 nm in ethanol/HEPES solution (1/5, pH 7.4), where HEPES was 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid. After the addition of Pb 2+ , an obvious red shift of 55 nm in fluorescence emission can be clearly observed, accompanied by a fluorescence color conversion, from bluish violet to greenish yellow under 365 UV light. As for Al 3+ , the fluorescence emission of TQ1 experienced a much more remarkable red shift of 124 nm, and its fluorescence color also changed to red. Furthermore, the fluorescence sensing process of Pb 2+ and Al 3+ were completely independent and free from interference of each other via changing the buffer concentration. Detection limit of the probe TQ1 towards Pb 2+ and Al 3+ were 8.3590 × 10 −7 M (linear range 1.6–10.0 μM) and 1.0568 × 10 −8 M (linear range 1.0–10.0 μM) respectively. The complexation properties of TQ1 toward Pb 2+ and Al 3+ were studied in detail.
研究领域:
分析化学
·
环境毒理学
·
生物传感
·
分子探针
·
重金属检测
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Huilin Hou,Minghui Shang,Fengmei Gao,Lin Wang,Qiao Liu,Jinju Zheng,Zuobao Yang,Weiyou Yang
Development of novel hybrid photocatalysts with high efficiency and durability for photocatalytic hydrogen generation is highly desired but still remains a grand challenge currently. In the present work, we reported the exploration of ternary hybrid TiO2/CuO/Cu thoroughly mesoporous nanofibers via a foaming-assisted electrospinning technique. It is found that by adjusting the Cu contents in the solutions, the unitary (TiO2), binary (TiO2/CuO, TiO2/Cu), and ternary (TiO2/CuO/Cu) mesoporous products can be obtained, enabling the growth of TiO2/CuO/Cu ternary hybrids in a tailored manner. The photocatalytic behavior of the as-synthesized products as well as P25 was evaluated in terms of their hydrogen evolution efficiency for the photodecomposition water under Xe lamp irradiation. The results showed that the ternary TiO2/CuO/Cu thoroughly mesoporous nanofibers exhibit a robust stability and the most efficient photocatalytic H2 evolution with the highest release rate of ∼851.3 μmol g–1 h–1, which was profoundly enhanced for more than 3.5 times with respect to those of the pristine TiO2 counterparts and commercial P25, suggesting their promising applications in clean energy production.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
光催化
·
清洁能源
·
多孔材料
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Haiping Li,Yuguo Xia,Zhiwei Liang,Guiming Ba,Wanguo Hou
Metal doping is a valid strategy to increase simultaneously photoabsorption, the charge separation efficiency, and thus the photocatalytic activity of polymeric carbon nitride (CN); however, metal elements in groups IIIA–VA in the periodic table are rarely researched in doping CN. Herein, indium (In)-doped CN (In:CN) was first synthesized with In3+ ions inserted in the interlayer, approaching the cavities in the monolayer sheets, and fixed through coordination with nitrogen atoms around them. In:CN exhibits a higher photoabsorption, specific surface area, charge separation and transfer efficiency, and photocatalytic performance in H2 generation and environmental remediation than bulky CN. The H2 generation and rhodamine B decomposition rates for In:CN are ∼2.9 and 4.6 times those for CN, respectively. The apparent quantum yield (420 nm) of In:CN for H2 production can reach 6.8%. The enhancement in charge separation plays an indispensable role for the photoactivity increase of In:CN, which originates from the generation of an impurity level above the valence band edge in the bandgap because of the In doping, i.e., the In3+-coordination structure works as a hole-capture center. This paper supplies an easy method for CN modification and illustrates the mechanism for In-doping-induced change of the energy band structure, which may guide the preparation of other CN-based photocatalysts with metal doping.
研究领域:
材料科学
·
光催化
·
能源化学
·
环境修复
·
半导体物理
·
纳米材料
·
功能高分子
✓ 已验证
DOI
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2013
·
IF 3.187
Yi Liu,Ruzhong Zuo,Shishun Qi
BiFeO 3 @carbon core/shell nanofibers (BFO@C NFs) with different thickness of carbon layers were successfully prepared by combining the electrospining technique and hydrothermal process. Scanning electron microscopy and transmission electron microscopy were employed to characterize the products. The results demonstrated that a uniform carbon layer was coated on the surface of BFO NFs. It was proposed that the introduction of carbon should not only enhance the light absorption of BFO NFs and the adsorption capacity for methyl orange, but also facilitate the separation of photogenerated electron–hole pairs, both of which result in the enhanced photocatalytic activity of BFO NFs. In addition, BFO@C NFs are stable under visible light irradiation and could be easily recycled, indicating that they can be used as effective photocatalysts under visible light.
研究领域:
材料科学
·
纳米技术
·
光催化
·
功能材料
·
环境化学
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 45
·1801963
·
IF 9.598
Weidong Han,Fuhai Cui,Yang Si,Xue Mao,Bin Ding,Hakyong Kim
Inorganic luminescent materials as one of the important high-performance materials are widely used for industry and scientific research, mainly owing to their outstanding luminescence properties. However, inorganic luminescent materials are typically brittle and inelastic, which greatly limit their use in practical applications, particularly in flexible optoelectronic devices. In this work, it is shown that “plum-pudding” like CsPbBr 3 /Cs 4 PbBr 6 perovskite crystals anchor onto Al 2 O 3 -La 2 O 3 (CCAL) nanofibrous membranes, which are synthesized via a facile electrospinning and subsequent supersaturated recrystallization process. The as-synthesized CCAL membranes exhibit outstanding mechanical flexibility and luminescence properties. Meanwhile, the crystal structure and luminous performance of the CCAL membranes are regulated by different molar ratios of CsBr/PbBr 2 . The photoluminescence reaches a maximum value for the CCAL membranes produced with a CsBr/PbBr 2 ratio of 1, and shows a narrow emission line-width of 18 nm. Furthermore, the potential applications of the CCAL nanofibrous membranes in green light devices through a remote nanofibrous membranes packaging approach are demonstrated. A pure green emission is achieved with the Commission Internationale de L'Eclairage color coordinates of (0.28, 0.65). This facile strategy would open a new avenue to flexible inorganic luminescent materials for the lighting and backlight display industries.
研究领域:
材料科学
·
纳米科技
·
光学工程
·
无机化学
·
柔性电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）