NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yufei Lei,Qi Li,Qian Li,Dongxiu He,Jinhua Xue,Lifu Liao,Jikai Wang,Xilin Xiao
In this paper, nitrogen-doped carbon dots (NCDs) were synthesized via a facile hydrothermal method using gum arabic (GA) and tris(hydroxymethyl)methyl aminomethane (tris) as precursors. The resultant NCDs show uniform size distribution and stable optical performance. Then a fluorescent signal quenching probe based on NCDs was proposed for the quantitative detection of mercury ions (Hg2+). The developed fluorescent nanoprobe based on NCDs demonstrated a good linear relationship in the range of 10 to 120 μM (R2 = 0.99265) for toxic mercury(II), with a detection limit of 4.87 μM. Additionally, the present assay system could be efficiently used for the detection of Hg2+ in real water samples with a satisfactory recovery rate (96.11–104.04%). The metal-free NCDs, which exhibited little cytotoxicity, were successfully applied to in vitro fluorescence imaging of human triple negative breast cancer (TNBC) cells, achieving visualization of Hg2+ in cells. With good water solubility and biocompatibility, the nitrogen-doped carbon dots synthesized by this economical and ecologically friendly process are suitable for use in analytical testing and biological research.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zhouxi Tan,Mingkang Zhang,Shuai Zhao,Yihua Huang,Zhengren Huang
Low strength and poor performance of SiC–WC composite for seals, attributable to the use of a large amount of liquid phase sintering additives, limit the application prospects of these materials. This study focuses on preparing high-strength, high-toughness, and wear-resistant SiC–WC composite using a small amount of aluminum and carbon black as sintering additives. The results revealed that the specimen containing 50 wt% WC exhibited the maximum flexural strength and fracture toughness of 645.9 MPa and 7.49 Mpa m 1/2 , respectively. These improvements were attributed to the deoxidizing and solid-solution effects of Al and the reinforcing effect of the WC second phase. Moreover, the specific wear rate was measured at 8.06 × 10 −7 mm 3 N −1 m −1 , which was 56.9 % lower than that of monolithic SiC. Results from Raman spectral analysis provided evidence of the presence of W–O bonds on the wear surface, indicating that the SiO 2 film could be successfully replaced by a WO 3 film.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Zhiqing Yang,Yi Wang,Dun Zhang
New approach for fabrication of photoelectrochemical sensing platform has been demonstrated for sulfate-reducing bacteria (SRB) detection based on biosynthesis of CdS quantum dots (QDs) sensitizing ZnO nanorod arrays. ZnO nanorod arrays were synthesized on the FTO substrate via galvanic-cell-based approach and then silanized by (3-Aminopropyl)triethoxysilane (APTES) with amino groups to introduce Cd 2+ . By taking advantage of the characteristic bacterial metabolite (H 2 S) reaction with Cd 2+ , CdS QDs can be biosynthesized on the surface of ZnO nanorod and significant enhancement of photocurrent due to the formation of CdS/ZnO heterostructures. The fabricated PEC sensing platform showed detection sensitivity of 32 cfu/mL for SRB. The current work can provide new strategies to construct advanced PEC sensing platforms for detections of physiologic messenger molecules (H 2 S).
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JOURNAL OF APPLIED PHYSICS
·
2018
·Vol. 123
·期 9
·
IF 2.176
Ma Xiaoxia,Cheng Shengxian,Hu Yan,Ye Yinghua,Shen Ruiqi
The integration of composite energetic films (CEFs) with various types of initiators can effectively adjust their performance and represents potential applications in microscale energy-demanding systems. In this study, the Al/Bi 2 O 3 /graphene oxide (GO) CEFs were successfully integrated into copper micro-ignitors by electrophoretic deposition, a low-cost and time-saving method. The effects of the Al/Bi 2 O 3 /GO CEFs with different GO contents on exothermic performance and ignition properties of micro-ignitors were then systematically investigated in terms of heat release, activation energy, ignition duration, the maximum height of the ignition product, and ignition delay time. The results showed that the addition of GO promoted more heat releases and higher activation energies of Al/Bi 2 O 3 /GO CEFs. The addition of ≤3.5 wt. % GO prolonged the ignition duration from 450 μ s to 950 μ s and increased the maximum height of the ignition product from about 40 mm to 60 mm. However, the micro-ignitors with more than 3.5 wt. % GO cannot be ignited, which suggested that GO played a contradictory role in the ignition properties of micro-ignitors and the controlled GO content was a prerequisite for improved ignition performance. The ignition delay time gradually extended from 10.7 μ s to 27.6 μ s with increases in the GO contents of Al/Bi 2 O 3 CEFs, revealing that an increase in the weight ratio of GO leads to lower ignition sensitivity of micro-ignitors.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 7
·5364-5379
·
IF 2.993
Xu Zhe,Jiang Deyi,Wu Fei,Guo Xiaogang,Wei Zhibo,Chen Jie
A simple electrophoretic deposition method followed by stearic acid modification was developed to prepare superhydrophobic multiscale nano-aluminum films on a series of metal substrates such as nickel, copper, titanium and stainless steel. The surface morphology and chemical compositions were characterized by a field emission scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscope, Fourier-transform infrared spectrophotometer and white light interferometer. The resultant nano-aluminum films exhibited excellent superhydrophobicity with a water contact angle of 168.5° and a water sliding angle of 2°. Furthermore, the obtained nano-Al films showed the desirable stability and durability after the related testing. In addition, the impact dynamic behaviors of water droplet on the superhydrophobic nano-Al films were described via the corresponding parameters, such as Weber number ( We ), spreading factor ( β ), contact time ( t c ), etc. Based on these characteristics, the superhydrophobic nano-Al films presented excellent water-repellent property. The EPD process is an efficient method to prepare superhydrophobic nano-Al films on common engineering metal materials, which can be applied to various industrial or manufacturing fields, including oil–water separation, anti-icing, self-cleaning, anti-corrosion, microelectronic fabrication and so forth.
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Advanced Science
·
2025
·
IF 14.1
Kang Liu,Yuying Zhang,Mengmeng Wang,Xiaohong Zhu,Roya Maboudian,Daniel C.W. Tsang
Impurities are pivotal in determining the quality of the critical metal products derived from spent lithium-ion batteries (LIBs), but there is a lack of understanding of their potential impacts. The mechanisms by which Aluminium (Al) impurities permeate the active crystals of spent ternary nickel─cobalt─manganese oxide (NCM) cathode materials and interact with critical metal sites are elucidated. During frictional contact, the substitution of transition metals by Al impurities disrupts the bonding between critical metals and oxygen, leading to the formation of more stable Al─O covalent bonds. Al can preferentially substitute for Co, altering the local coordination and electronic structure of transition metals. Owing to the strong interaction of Al─O, the Fermi level shifts downward, thus increasing the stabilization of lattice oxygen in the NCM cathode materials and consequently delaying the dissolution of NCM cathode materials. In different extraction environments, the invasion of Al retards the release of lattice oxygen and inhibits the dissolution of NCM in formic acid but enhances those in ammonia solution and shows mixed results in deep eutectic solvents. These crucial findings will help to elucidate the mechanisms of Al impurities in the recycling industry chain of retired LIBs, thereby enhancing the recovery of high-quality critical metal products.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Kai Su,Xuekun Tian,Xinmei Hou,Zhenyi Zhao,Xusheng Liu,Deze Ouyang,Huiyu Yuan,Xinhong Liu
Ti 3 AlC 2 powder was prepared via an efficient solid-liquid reaction in flowing argon using coconut shell charcoal as novel carbon source, and phase evolution, microstructure and oxidation behavior of Ti 3 AlC 2 powder were investigated. The results show that coconut shell charcoal is dominated by amorphous carbon after carbonization with some turbostratic graphite-like structure, and large specific surface area of coconut shell charcoal gives its excellent reactivity. Ti 3 AlC 2 powder prepared at 1400 °C for 1.5 h exhibits good crystallinity and typical nanolayered structure. Ti 3 AlC 2 powder remains thermally stable in air below 552 °C, while oxidizing occurs rapidly between 900 and 1100 °C. The isothermal oxidation curves show a parabolic-like, indicating that the oxidation process is primarily controlled by a diffusion mechanism. The good oxidation resistance of Ti 3 AlC 2 powder is attributed to the oxidized products of TiO 2 and Al 2 O 3 grains formed a connected and dense protective layer on the particle surface at elevated temperatures.
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COMBUSTION AND FLAME
·
2024
·
IF 5.8
Xueqin Liao,Jianzhong Liu,Zexu Li,Mengxia Sun
Aluminum (Al) particles are widely used in propellants, thermite and pyrotechnics. However, commonly used micro Al has drawbacks such as agglomeration, high ignition temperature and slow burning rate, making its energy potential not fully exploited in applications. Therefore, exploring pathways to enhance the combustion of Al particles has become the focus at present. Herein, L -malic acid (LMA) was used to corrode the surface of Al particles to obtain a sample (named LMAl) with an average specific surface area of 11.456 m 2 /g (corresponding to Al particles with a diameter of 194 nm). The particle size distribution of LMAl did not change significantly compared to pristine Al. The XPS results showed that a small amount of LMA and corrosion products remained on the surface of the LMAl particles. Thermal analysis tests showed that the thermal oxidation rate and efficiency of LMAl was dramatically higher than that of pristine Al. Compared with the pristine Al, the combustion characterization parameters of LMAl such as combustion intensity, ignition delay time, maximum combustion temperature, mass burning rate and combustion efficiency were all improved. This trend was maintained after blending the ammonium perchlorate (AP). The condensed combustion products (CCPs) of Al revealed a large number of agglomerates and unburned Al particles. While many broken particles and tentacle-like structures were found in the CCPs of LMAl. Overall, compared to Al, the combustion of LMAl is significantly enhanced. The thermal reaction and combustion behaviors of the two are quite different. This study provides new insights into improving the ignition and combustion of Al.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yanan Sun,Yuqi Zhu,Shengjiang Zhang,Suhang Chen,Fengqi Zhao,Kangzhen Xu
Thermal decomposition of ammonium perchlorate (AP) typically requires high temperatures and activation energy, but the introduction of combustion catalysts will improve its thermal decomposition performance. Therefore, it is crucial to rationally design combustion catalysts for enhancing the thermal decomposition performance of AP. Herein, 3D NiO nanoflowers@2D graphite-phase carbon nitride (g-C 3 N 4 ) nanosheets (NiO@x%CN, x = 1, 3, 5, 7, 9) composite catalysts were constructed by solvothermal and calcination methods, and characterized by a series of analyses. NiO@5%CN displayed the best ability to catalyze the thermal decomposition of AP, which reduced the high decomposition temperature of AP by 113.8 °C and the activation energy by 21.67 kJ mol −1 . The combustion rate of NiO@5%CN-CSP has increased by 118 % compared to that of composite solid propellants. This work provides a new insight for the design of NiO-based high-efficiency combustion catalysts.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Yonghui Yang,Hengwei Yan,Pengchen Yang,Zhanwei Liu,Guang Yang
The segregation of aluminum-silicon alloys directly impacts the mechanical and chemical properties of the alloys, Therefore, homogenization of alloys is of great significance for alloys. This study initially investigated the electrochemical behavior of aluminum (III) and silicon (IV) during the preparation of aluminum-silicon (Al-Si) alloys in NaF-AlF 3 -Al 2 O 3 -SiO 2 molten salts through cyclic voltammetry and steady-state polarization. The results revealed that Al 2 O 3 underwent one-step reduction to Al, whereas SiO 2 underwent a two-step reduction process to Si. In addition, electrolysis experiments were carried out in a NaF-AlF 3 -Al 2 O 3 -SiO 2 -5wt%CaF 2 -1wt%MgF 2 -2wt%LiF molten salt system with molecular ratio of 2.4. These experiments involved variations in current density, electrolysis time, Al 2 O 3 and SiO 2 additions. It is worth noting that under the conditions of current density of 0.7 A/cm 2 , electrolysis time of 2 h, and silica addition of 2 %, the reduction rate of silicon reached a maximum value of 72.57 %, at which time the silicon in the aluminum-silicon alloys showed a dendritic structure, which was uniformly distributed throughout the entire alloy, and the segregation of the alloy was effectively avoided.
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Materials Today Chemistry
·
2025
·
IF 6.7
Haozhe Li,Xiandie Zhang,Heng Xu,Xuxu Cui,Zhijie Fan,Zhen Liu,Xiaode Guo
The pursuit of high combustion performance and good mechanical properties is an urgent need for the development of composite solid propellants. Ammonium perchlorate/cobalt alginate/ZIF-67 (AP/Co-A/ZIF) composites were successfully synthesized by droplet and solution assembly method. The layered porous structure of Co-A increases the reaction site between AP and ZIF-67 so that is oxidized to produce Co 3 O 4 earlier, and further accelerate the heat release of the system. carbonized porous framework formed by the decomposition of Co-A has kind electrical and thermal conductivity, and makes Co 3 O 4 produced by the decomposition of ZIF-67 and Co-A well dispersed on the framework, achieving efficient charge transfer. The synergistic catalysis of Co-A/ZIF makes the low and high temperature decomposition stages of AP combine, which the high temperature decomposition temperature greatly reduced with a higher heat release. After being applied to AP-based propellants, the organic porous structure of Co-A shortens the heat transfer distance and plays an obvious combustion-supporting effect, while ZIF-67 accelerates the energy release rate to burn more violently, so that considerably improves the ignition capacity and combustion rate of the propellant. In addition, the reaction of Co-A and TDI effectively strengthens the interface interaction between AP and binder matrix, alleviates the dewetting phenomenon, and enormously improves the mechanical properties of the propellant. As an efficient composite nonmetallic combustion catalyst, Co-A/ZIF not only exhibits strong synergistic catalytic ability for propellant combustion, but also effectively improves the mechanical properties of the propellant. It provides a development direction for building a new catalyst to enhance the comprehensive performance of AP-based solid propellant.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 39
·2404772
·
IF 27.4
Ning Sun,Zhichuan Zheng,Zhuangzhuang Lai,Junjie Wang,Peng Du,Tianping Ying,Haifeng Wang,Jianchun Xu,Runze Yu,Zhiwei Hu,Chih-Wen Pao,Wei-Hsiang Huang,Ke Bi,Ming Lei,Kai Huang
While high-entropy alloys, high-entropy oxides, and high-entropy hydroxides, are advanced as a novel frontier in electrocatalytic oxygen evolution, their inherent activity deficiency poses a major challenge. To achieve the unlimited goal to tailor the structure–activity relationship in multicomponent systems, entropy-driven composition engineering presents substantial potential, by fabricating high-entropy anion-regulated transition metal compounds as sophisticated oxygen evolution reaction electrocatalysts. Herein, a versatile 2D high-entropy metal phosphorus trisulfide is developed as a promising and adjustable platform. Leveraging the multiple electron couplings and d–p orbital hybridizations induced by the cocktail effect, the exceptional oxygen evolution catalytic activity is disclosed upon van der Waals material (MnFeCoNiZn)PS 3 , exhibiting an impressively low overpotential of 240 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 32 mV dec −1 , and negligible degradation under varying current densities for over 96 h. Density functional theory calculations further offer insights into the correlation between orbital hybridization and catalytic performance within high-entropy systems, underscoring the contribution of active phosphorus centers on the substrate to performance enhancements. Moreover, by achieving electron redistribution to optimize the electron coordination environment, this work presents an effective strategy for advanced catalysts in energy-related applications.
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