MATERIALS LETTERS
·
2017
·
IF 2.572
Zhibo Wei,Deyi Jiang,Jie Chen,Xiaogang Guo
In this study, we reported a new method to fabricate superhydrophobic Al films by combination of HCl/H 2 O 2 etching and electrophoretic deposition process. Through this two-step method, multi-scale hierarchical structures were successfully introduced on the surface. After hydrophobization, the resultant surface showed an excellent superhydrophobicity with a water contact angle of 169.6° and a sliding angle of ca. 1°. Furthermore, the surface exhibited excellent mechanical durability and could withstand abrasion tests under 8 kPa for 60 cm without losing superhydrophobicity. It also maintained superhydrophobicity when exposed to air or water for a long-term period. This work provides a cost efficient method to prepare mechanically robust and stable superhydrophobic Al alloy surface.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yeming Huang,Jingxuan Zhang,Renhong Wang,Bing Gao,Ruyi Miao,Sirun Zhang,Dunju Wang
Improving the energy release efficiency of aluminium powders in weaponry is essential. In this study, uniform core-shell Al@(PFDTES/GAP) was prepared by hydrolyzing PFDTES and co-reacting it with GAP on aluminum powder. It showed better thermal reaction, combustion and energy release. The thermal properties of Al@(PFDTES/GAP) exhibit a significant aluminum-fluorine exothermic phenomenon in DSC, with a 4.9 % increase in exothermic heat in the combustion test compared to raw-Al. For the samples blended with PTFE, Al@(PFDTES/GAP)/PTFE demonstrated excellent performance in terms of increased heat release (increased by 28.0 %) in DSC, higher heat release (increased by 10.2 %) in the heat of combustion test, larger combustion flame area and faster combustion speed (the time reduced by 20.0 %) in the air, compared with that of raw-Al/PTFE. In conclusion, this method is simple and effective to enhance the energy release of aluminium powder, which is of great significance for improving the energy of weapons and equipment.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·Vol. 149
·期 12
·5985-5994
·
IF 3
Liao Xueqin,Du Longjin,Sun Mengxia,Liu Hui,Liu Jianzhong
Aluminum has been long and widely used in propellants, thermite, and pyrotechnics. However, the commonly used micron aluminum has the problems of slow burning rate and incomplete release of chemical energy in the combustion process. Therefore, finding ways to promote the ignition and combustion of aluminum is essential to enhance the performance of aluminum-based energetic materials. Herein, environmentally friendly tannic acid (TA) and tea polyphenols (TP) were used to surface modify aluminum to improve its combustion performance, respectively. The results showed that TA and TP could be coated on the outer surface of aluminum particles effectively by solvent evaporation induced self-assembly method. Heat was released during the thermal decomposition of the composite particles, which was clearly beneficial in promoting aluminum ignition. Ignition and combustion tests showed that after modification with TA and TP, the samples showed shorter ignition delay, increased combustion time, increased combustion intensity, and reduced agglomeration compared to pure aluminum. This revealed that the modified samples possessed better ignition and combustion properties. The X-ray diffraction patterns of the condensed combustion products showed that the products of pure aluminum possessed more active aluminum and aluminum nitride, while the samples modified with TA and TP had more γ-Al 2 O 3 and α-Al 2 O 3 , suggesting that TA and TP could effectively enhance the combustion efficiency of aluminum. In addition, TP showed better modification than TA, which may be related to the higher heat release during thermal decomposition of TP. Although TA and TP can improve the ignition and combustion performance of aluminum to some extent, the enhancement effect is limited. Considering that TA and TP possess good adhesion, perhaps they can play a better role in promoting as intermediate layers in the future. It is hoped that this paper can provide a new idea for the surface modification of aluminum.
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Advanced Science
·
2024
·Vol. 11
·期 26
·2401564
·
IF 14.3
Ruibin Wang,Lichen Zhang,Xiaodong Li,Lixiang Zhu,Zilong Xiang,Jin Xu,Dichang Xue,Zitong Deng,Xing Su,Meishuai Zou
Surface modification is frequently used to solve the problems of low combustion properties and agglomeration for aluminum-based fuels. However, due to the intrinsic incompatibility between the aluminum powder and the organic modifiers, the surface coating is usually uneven and disordered, which significantly deteriorates the uniformity and performances of the Al-based fuels. Herein, a new approach of monolayer nano-vesicular self-assembly is proposed to prepare high-performance Al fuels. Triblock copolymer G-F-G is produced by glycidyl azide polymer (GAP) and 2,2′-(2,2,3,3,4,5,5-Octafluorohexane-1,6-diyl) bis (oxirane) (fluoride) ring-open addition reaction. By utilizing G-F-G vesicular self-assembly in a special solvent, the nano-sized vesicles are firmly adhered to the surface of Al powder through the long-range attraction between the fluorine segments and Al. Meanwhile, the electrostatic repulsion between vesicles ensures an extremely thin coating thickness (≈15 nm), maintaining the monolayer coating structure. Nice ignition, combustion, anti-agglomeration, and water-proof properties of Al@G-F-G(DMF) are achieved, which are superior among the existing Al-based fuels. The derived Al-based fuel has excellent comprehensive properties, which can not only inspire the development of new-generation energetic materials but also provide facile but exquisite strategies for exquisite surface nanostructure construction via ordered self-assembly for many other applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yawei Wang,Xinying Xie,Xiaofei Wang,Chaoyi Wang,Ming Gao,Feiyue Qian,Hongbing Qin,Xuedong Wang,Junxia Wang
The trace-level detection of tetracyclines (TCs) in food products is essential to ensure food safety and public health. Herein, we prepared the methionine-doped carbon quantum dots (Met-CQDs) using citric acid as the precursor. Met-CQDs exhibited a Gaussian unimodal peak centered at 440 nm in the fluorescent excitation spectrum, along with a remarkable greenish-blue emission and a fluorescent quantum yield of 33.5 %. Furthermore, the presence of TC (the quencher) caused a rapid quenching of the fluorescence of Met-CQDs, accompanying with a color transition from light blue to dark bule as TC concentrations increased. The coloring variation was also detected by the images captured by smartphones and RGB analysis software, facilitating portable detection of TC utilizing Met-CQDs as a fluoroprobe. The findings indicate that the Met-CQDs based fluoroprobe exhibits high selectivity, rapid response (only ∼1 min) according to an “ON-OFF” sensing model. This fluorescence sensing method gave a low detection limit (LOD) of 0.032 μM and excellent linearity for TC in the concentration range of 0.1–500 μM. Also, the smartphone-based fluorescence-visualizing approach displayed good linearity with a LOD of 0.33 μM. The interactions between this fluoroprobe and TC occurred by virtue of both inner filter effect (IFE) and static-quenching principle. The average recovery for TC in the milk, honey, and tap water samples was determined to be 98.46 ± 1.71 % by a fluorometric method. Overall, both fluorometric and RGB approaches demonstrate strong correlation with conventional LC-MS/MS, and thus the as-fabricated Met-CQDs are promising for the preliminary screening of TCs’ residues in food products.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhenzhe Wei,Yu Shi,Peng Li,Mingxia Gao,Xiaoyu Zhang,Hongge Pan,Chu Liang
Graphitic carbon has been emerged as one of the most promising anode materials for potassium-ion batteries (PIBs) due to its moderate theoretical specific capacity, high electrical conductivity, and outstanding chemical stability. However, the structure of graphitic carbon usually experiences irreversible damage during the charge and discharge process, primarily due to the large radius of potassium ion. In contrast to the traditional preparation methods, we develop a low-carbon approach to obtain graphitic carbon with larger lattice spacing via a rapid chemical conversion between CO 2 and NaAlH 4 at ∼62 °C. We confirm that the CO 2 /NaAlH 4 ratio plays a crucial role in increasing the degree of graphitization and promoting the formation of a flaky morphology of carbon materials. When applied as an anode material for potassium storage, the prepared graphitic carbon exhibits outstanding cycling stability and rate performance. It maintains a reversible capacity of 210 mAh g −1 after 1000 cycles at a current density of 0.1 A g −1 , with a capacity retention rate of 95.9 %. This efficient method of preparing graphitic carbon provides valuable inspiration for the development of advanced energy storage materials.
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TALANTA
·
2025
·
IF 6.1
Xin Liu,Shiyue Niu,Bin Yang,Jia Liu,Liqian Niu,Xian Wang,Daqian Song,Shuyun Bi
Ultrasensitive Surface-enhanced Raman spectroscopy (SERS) method for the detection of diquat/dipterex was established using bovine serum albumin (BSA)-protected silver nanoparticles (AgNPs) modified MIL-53(Al) (named as BSA/MIL-53(Al)/AgNPs). Compared with unmodified AgNPs, BSA/MIL-53(Al)/AgNPs significantly enhanced the Raman signals of diquat and dipterex and the enhancement factors (EFs) were 1.58 × 10 7 and 2.34 × 10 7 , respectively. The TEM, XRD, TGA, XPS, UV–vis and FT-IR were utilized to characterize BSA/MIL-53(Al)/AgNPs and the binding of the substrate with diquat/dipterex. The optimal measurement conditions were investigated in detail by single factor experiment and response surface model. The impacts of common pesticides and coexisting substances on the determination of diquat/dipterex were studied. Under optimum conditions, linear calibration curves for detecting diquat/dipterex were established with a limit of detection (LOD) of 0.17/0.89 pmol L −1 (3 S 0 / S ). The SERS approaches were used to detect diquat and dipterex in several fruits and vegetables. The recovery was 97.10 %–104.82 % with the relative standard deviation (RSD) of 1.04 %–4.15 % ( n = 5).
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haohang Song,Yusheng Ma,Qian Yao,Chao Liu,Xuesong Li,Xutang Tao
MXene has attracted broad attention for its unique physicochemical properties and has flourished in many research areas. Since MXene obtained by high crystalline-quality MAX phase has excellent stability and properties, the etching of high crystalline-quality MAX phase and delamination into monolayer will become an inevitable trend. However, the delamination of the high crystalline-quality MXene is significantly more challenging than conventional MXene because of the more vital van der Waals forces of the more regular interlayer structure. Here, we propose a freeze-sonication delamination (FSD) strategy that can solve the difficult problem of efficiently exfoliation of high crystalline-quality MXene. The principle is to utilize the synergistic effect of ultrasound and ionic intercalation to allow a large number of water molecules to penetrate into the interlayer, which results in volume expansion, and then ultrasound to obtain monolayer MXene in a frozen state. This method not only increases the yield of high crystalline-quality monolayer MXene but also prevents the size reduction and the nanosheet destruction. The yield of monolayer MXene reached 74.2 % with a concentration of 19.8 mg/mL after six FSD cycles (the time of ultrasound treatment is 5 min after per freeze). Meanwhile, under the protection of ice, the obtained monolayer MXene has a larger size with more complete nanosheets than ultrasound-delaminated MXene. Supercapacitors made of high crystalline-quality MXene exhibits excellent gravimetric capacitance of 261.1 F/g and satisfactory cycling stability.
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ACTA MATERIALIA
·
2024
·
IF 8.3
Chaowen Tan,Wansen Ma,Liwen Hu,Qian Li,Xuewei Lv,Jie Dang
As a new type of two-dimensional material, MXenes with increased entropy (ME/HE-MXenes) possess immense potential for exhibiting unforeseen properties, making them a compelling subject for further investigation. However, due to the difficulty in predicting and preparing stable medium-entropy MAX (ME-MAX), as precursors of ME-MXenes, only a few ME-MXenes have been synthesized successfully. Herein, we proposed a thermodynamic competition strategy that enabled the successful synthesis of a stable ME-MAX consisting of four-transition metals: Ti, V, Cr and Nb, which was first predicted by density functional theory calculation. The resulting ME-MAX with a hexagonal crystal structure and pseudo-structure of P 6 3 /mmc, possessed the chemical formula TiVCrNbAlC 3 . Subsequently, the corresponding ME-MXene was prepared by selectively etching the Al layer using HF acid, obtaining the desired composition of Ti 1.1 V 1.1 Cr 0.4 Nb 1.4 C 3 T x . Furthermore, aberration-corrected scanning transmission electron microscopy analysis revealed that the MX slabs within the prepared ME-MXene contained four transition metal layers arranged in an α -configuration, which was consistent with the atomic structure of the ME-MAX. In comparison to single transition metal MXenes, the tailored ME-MXene showcased lattice distortions attributable to the highly diverse composition space, consequently leading to increased active sites and improved electrical conductivity . As a result, the annealed Ti 1.1 V 1.1 Cr 0.4 Nb 1.4 C 3 T x has higher mass capacitances when used as the supercapacitor negative electrode, with weight capacitances of 292.74 F g −1 at 2 mV s −1 and 137.20 F g −1 at 200 mV s −1 . The strategy proposed in this study not only expands the realm of achievable ME-MAX compositions but also opens up new possibilities for derivative medium-entropy MXenes.
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FUEL
·
2024
·
IF 6.7
Chunlong Jiang,Haobo Bi,Qizhao Lin,Zhanshi Ni
Aluminum is a widely used high-energy material. However, under environmental conditions, it is easy to form a layer of oxide cap on the surface of aluminum particles, which hinders the combustion of aluminum powder. In this paper, different oxides (MgO, SiO 2 , Fe 2 O 3 and CuO) were added to aluminum powder to study the influence of different additives on the combustion process of nano aluminum (nAl). It is found that four additives can improve the combustion rate of nAl in high temperature environment, especially Fe 2 O 3 and CuO. The molecular structure, element distribution and micro morphology of the combustion products were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). In addition, combined with the thermogravimetric experiment, it is found that under the temperature programmed condition, the influence of four oxides on the combustion process of nAl was not obvious.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 131
·期 1
·1-7
·
IF 2.5
Guo Yiming,Zhang Lei,Zhao Yong,Huang Mei,Xu Min,Zhang Yong
This research employed the powder-in-tube (PIT) method to facilitate the introduction of the non-metallic element iodine (I) into the preparation of Nb 3 Al superconducting wires. After heating in a tube furnace, a rapid heating, quenching, and transformation (RHQT) treatment was conducted. It was observed that as the quantity of iodine introduced increased, the extent of the Nb/Al reaction also rose, indicating that a certain amount of iodine can be introduced to facilitate the Nb/Al reaction, thereby enabling Nb to react more fully with Al in the subsequent process and generating a Nb 3 Al superconducting phase that is closer to the stoichiometric ratio. Wires with iodine contents of 1.0 wt%, 1.5 wt%, and 2.0 wt% exhibited a diffusion layer at the Nb/Al interface after heating in a tube furnace at 1000 °C for 30 min. The primary component of the diffusion layer was Nb 2 Al. No diffusion layer was observed in the pure sample or in the group with 0.5 wt% I. However, a eutectic phase was present at the edge of Nb and Al. The wires with 1.0 wt% and 1.5 wt% I exhibited higher critical temperatures ( T c ) of 18.236 K and 17.421 K, respectively, than the pure sample. Additionally, they demonstrated superior critical current density ( J c ) properties compared to the pure sample.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Liucheng Cao,Miao Chen,Yiming Zhang,Jingying Hu,Yi Wu,Ying Chen,Ruijia Wang,Haoyi Yuan,Fuxiang Wei,Yanwei Sui,Qingkun Meng,Lifeng Cheng,Shengqi Wang
Manganese-based cathodes are competitive candidates for state-of-the-art aqueous zinc-ion batteries (AZIBs) because of their easy preparation method, sufficient nature reserve, and environmental friendliness. However, their poor cycle stability and low rate performance have prevented them from practical applications. In this study, Mn 3 O 4 nanoparticles were formed in situ on the surface and between the interlayers of Ti 3 C 2 T x MXene, which was pretreated by the intercalation of K + ions. Ti 3 C 2 T x MXene not only provides abundant active sites and high conductivity but also hinders the structural damage of Mn 3 O 4 during charging and discharging. Benefiting from the well-designed K-Ti 3 C 2 @Mn 3 O 4 structure, the battery equipped with the K-Ti 3 C 2 @Mn 3 O 4 cathode achieved a maximum specific capacity of 312 mAh/g at a current density of 0.3 A/g and carried a specific capacity of approximately 120 mAh/g at a current density of 1 A/g, which remained stable for approximately 500 cycles. The performance surpasses that of most reported Mn 3 O 4 -based cathodes. This study pioneers a new approach for building better cathode materials for AZIBs.
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