Journal of Energy Storage
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2024
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IF 8.9
Weisan Hua,Miaomiao Jiang,Xuelai Zhang,Qiang Sun,Wenzhuang Zhang
Calcium chloride hexahydrate (CCH) has a large latent heat of phase change, a high heat storage capacity and a relatively low cost, which makes it suitable for use in combination with the construction field. However, it has the problem of large supercooling, which limits its development and application. Studying the crystalline growth properties of calcium chloride hexahydrate is essential to comprehending or suppressing supercooling because the degree of supercooling is determined mainly by the room temperature(5–10 °C) melt structure of CCH and the structural factors that drive its supercooling behavior. Using a combination of macroscopic and microscopic research techniques, we explored the two features of the self-crystallization growth behavior of CCH at various initial concentrations and the crystallization growth behavior driven by the external addition of crystal nuclei were explored. The results showed that the water molecule content affects not only the product type but also the growth, development, and regrowth of crystals and crystal morphology. The observation of the triggered crystallization process under different nucleation types showed that the nucleation type affected the crystal growth, and SrCl 2 ·6H 2 O, which had a similar molecular structure, could replace the nucleation of CCH itself and accelerate the crystal growth process. At the same time, NaCl was more difficult to nucleate and inhibited crystal growth. To better understand subcooling and its inhibition, this paper examined the crystallization formation characteristics of CCH at various concentrations, compares and contrasts its crystallization characteristics under various nucleating agents as the triggering nuclei, and investigated the intrinsic mechanism of the nucleus type on its crystallization growth.
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JOURNAL OF MATERIALS SCIENCE
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2025
·Vol. 60
·期 7
·3392-3407
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IF 3.9
Wang Xuewen,Zhao Jie,Shi Qingwen,Li Peibo,Luo Guoqiang,Shen Qiang,Sun Yi
Metal electrodes of crystalline silicon solar cells need to possess good photoelectric conversion properties and play a critical role in converting solar energy into electrical energy, making it particularly important to obtain highly conducive, cost-effective and chemically stable materials. This paper prepared uniformly silver-coated copper powders (Cu@Ag) via electroless plating and a conductive film with low sheet resistance by air oxidation combined with hydrogen reduction sintering (jointly referred to as oxidation–reduction sintering). In addition, the densification mechanism of the Cu@Ag conductive film during sintering was revealed. Results showed that oxidation–reduction sintering promoted the diffusion between Cu and Ag, enhancing the plastic flow of phases and improving the densification of the conductive film. Moreover, the densification of the conducive films was further improved by designing multiple layers. The sheet resistance of the four-layer Cu@Ag conductive film was reduced to 1.5 mΩ/□ at 700 °C, while that of the four-layer Cu@Ag conductive film increased by only 0.6 mΩ/□ at 200 °C after eight days, much more stable than Cu film. This work demonstrates the tremendous potential of oxidation-resistant Cu@Ag conductive pastes in low-cost photovoltaic cells, electronics, and other commercial applications. Graphical
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Reaction Chemistry & Engineering
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2024
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IF 3.4
Shaoyuan Guo,Xinli Tong,Jipeng Wang,Hang Tang
The use of high-entropy oxides (HEOs) in heterogeneous catalysis is a fascinating research direction in the chemical field. In this work, a highly selective aerobic oxidative C–C bond cleavage using a 1,2-diol and lignin model is achieved with the HEOs-derived multimetallic catalyst. In the transformation of 1-phenyl-1,2-ethanediol, a 96.1% conversion with 96.2% selectivity of benzaldehyde was obtained using MgCuMnFeCo–R as the catalyst. Therein, the partial reduction of Fe2+ and Co2+ leading to the formation of numerous oxygen vacancies, plays a crucial role in the excellent catalytic activity. Moreover, this HEO-derived catalyst could maintain high activity even after being reused more than 10 times.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Can Wu,Haitao Zheng,Mengmeng Liu,Qiang Xia,Lidan Yao,Zefei Zhu
Carbon quantum dots (CQDs) exhibit exceptional structural properties and minimal environmental impact, garnering significant interest in the field of lubrication. In this study, four types of modified CQDs with varying alkyl chain lengths were synthesized through hydrothermal methods and subsequently mixed with lithium grease (LG) to formulate mixed greases. The influence of the alkyl chain length on the CQDs used as additives in the mixed greases was investigated with a four-ball friction and wear tester, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). Specifically, compared to pure LG, the modified CQDs with the shortest alkyl chain length reduced the coefficient of friction (COF), the diameter of abrasive spots, and the depth of abrasive scars by 33.65%, 42.11%, and 51.87%, respectively. This improvement can be attributed to the ease of these shorter-chain CQDs entering the contact area and forming a stable film containing carbon, nitrogen, and oxygen elements through friction. The tribological properties of modified CQDs can be effectively controlled by adjusting the length of the carbon chain, providing a theoretical basis for the design of environmentally friendly and sustainable grease additives in engineering applications.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Jie Zhang,Rongying Yin,Zihao Fan,Xinwei Zhou,Haiming Cheng,Changqing Hong,Xinghong Zhang
Lightweight ablative thermal protection materials (TPMs), which can resist long-term ablation in an oxidizing atmosphere, are urgently required for aerospace vehicles. Herein, carbon fabric/phenol-formaldehyde resin/siloxane aerogels (CF/PFA/SiA) nanocomposite with interpenetrating network multiscale structure was developed via simple and efficient sol–gel followed by atmospheric pressure drying. The ternary networks structurally interpenetrating in macro-, micron-, and the nanoscales, chemically cross-linking at the molecular scale, and silica layer generated by in situ heating synergistically bring about low density (∼0.3 g cm–3), enhanced mechanical properties, thermal stability, and oxidation resistance, and a low thermal conductivity of 81 mW m–1 K–1. More intriguingly, good thermal protection with near-zero surface recession at 1300 °C for 300 s and remarkable thermal insulation with a back-side temperature below 60 °C at 20 mm thickness. The interpenetrating network strategy can be extended to other porous components with excellent high-temperature properties, such as ZrO2 and SiC, which will facilitate the improvement of lightweight ablative TPMs. Moreover, it may open a new avenue for fabricating multifunctional binary, ternary, and even multiple interpenetrating network materials.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2025
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IF 3.5
Hussain Asif,Ahmed Sadam,Boota M.,Khan Pir Bukhsh,Nazir Sadia,Jeridi Mouna,Alshahrani Thamraa,Hou Jianhua
Advanced industrialization and globalization have conduct to extensive energy and pollution emergencies, demanding the growth for novel solutions. The release of synthetic dyes as industrial waste has emerged as a global environmental challenge. Large quantities of these dyes are discharged into wastewater each year, posing serious risks due to their toxic and harmful effects. Semiconductor’s materials have emerged as a sustainable and green remediation solution for contaminant degradation. Among various materials, graphitic carbon nitride stands out as an extensively investigated material due to ease fabricated and low cost. In this study, sulphur-incorporated graphitic carbon nitride was fabricated for photocatalytic. In this study, sulphur-assisted graphitic carbon nitride was fabricated for photocatalytic activity. Several fabrication routes were employed, including thermal polymerization, sonication, chemical oxidation, and stepwise thermal polymerization. The material was characterized, and its photocatalytic activity was evaluated for methylene blue dye degradation. The fabricated trials exhibited 2.79 eV, 2.72 eV, 2.82 eV, and 2.56 eV band gap energies, with, 67%, 70%, 75%, and 99.5% pollutants degradation activity, respectively. The trial fabricated with chemically oxidation route attributed higher photocatalytic activity (99.5%, in 50 min) with the reaction rate constant ( K = 0.069). The aforementioned results and measurements are supported by UV–vis diffuse reflectance, signifying bandgap energy, XRD for structural and SEM for morphological and EDX for elemental qualitative analysis. The chemical oxidation route shows an effective method for the synthesis of sulphur-assisted graphitic carbon nitride. This novel approach has the potential to advance fabrication techniques within the scientific community. Graphical abstract
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
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2025
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IF 3.4
Qi Shi,Siqi Huang,Qi Xi,Yanan Niu,Nuan Wen,Libo Du,Yuguang Lv,Tai Peng
In this study, Ti 3 C 2 quantum dots (QDs) were prepared via a simple hydrothermal method and loaded onto binary catalytic materials to construct ternary PTCN/SnS 2 /Ti 3 C 2 QDs composites for enhancing photocatalytic performance. The materials were characterized using techniques such as XRD, TEM, FT-IR, UV–vis, BET, XPS, and PL. The results showed that Ti 3 C 2 QDs were uniformly dispersed on the surface of PTCN/SnS 2 , forming a stable heterostructure. The specific surface area increased to 68.847 m 2 /g (5.6 times higher than that of PTCN), the visible light absorption edge redshifted to 532 nm, and the band gap narrowed to 2.1 eV. Under visible light, the composite exhibited degradation rates of 90.53 %, 79.53 %, 81.23 %, and 85.62 % for norfloxacin, pefloxacin, enrofloxacin, and ciprofloxacin, respectively. At the optimal doping amount (k = 0.0408 min −1 ), the catalytic activity was 6.21 times that of pure PTCN and 2.87 times that of PTCN/SnS 2 . Cyclic experiments demonstrated excellent stability of the composite, with a degradation rate remaining at 86 % after 5 cycles. This study is the first to construct the PTCN/SnS 2 /Ti 3 C 2 QDs ternary system and propose a Z-scheme charge transfer mechanism, providing new insights for the design of high-efficiency photocatalytic materials.
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JOURNAL OF MATERIALS SCIENCE
·
2025
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IF 3.9
Dong Wentao,Zhang Mingguang,Peng Tao,Peng Yangyi,He Zanhua,Yao Daojin
With the rapid development of high-speed railway, real-time monitoring of operation safety becomes more and more crucial. However, power supply for microsensors in railway monitoring systems is still demanding and challenging. Stable energy to onboard sensing devices is essential to ensure the safe operation of rail transit systems. Herein, a hybrid piezoelectric–triboelectric nanogenerator (HPTG) is proposed to harvest the vibration energy on the bogie, which is also used as the self-powered sensing for continuous structural health monitoring (SHM) of train bogie. HPTG is designed and fabricated with polyvinylidene fluoride (PVDF)/zinc oxide (ZnO) composite and polydimethylsiloxane (PDMS) film. The experiment results demonstrate that incorporating ZnO simultaneously enhances piezoelectric and triboelectric outputs while improving the overall output performance of the device, fully realizing the synergistic effect of piezoelectric effect and triboelectric effect. Under the condition of external load, the maximum power of the hybrid output is 3.256 μW with excellent working stability. Through the integration of rectifier circuit and energy storage module, the microthermohygrometer is successfully driven. In addition, the feasibility of vibration energy harvesting of HPTG in the actual operating environment is further verified on the small-scale wheel rolling test bench, which provides a solution for the power supply problem of microelectronic equipment for train bogie monitoring, and can effectively help to develop the self-powered monitoring system of rail transit.
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LANGMUIR
·
2025
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IF 3.9
Zhenxin Yang,Fushun Li,Yuanju Zhao,Delong Yang,Juntao Hu,Tao Zhang,Deng-Ke Wang,Qiang Zhu,Zheng-Hong Lu
Organic field-effect transistors (OFETs) fabricated on SiO2/Si wafers represent a crucial avenue for the development of organic-on-silicon technology and serve as a platform for materials science to characterize carrier mobility. The surface cleaning treatment of wafers is critical because OFETs are highly sensitive to surface states. In this study, the effects of intrinsic organic contaminants on wafers, as well as the functions of commonly used cleaning solvents and treatments on the surface states, electronic structure of SiO2, and the performance of OFETs were systematically investigated. The intrinsic organic contaminants on the wafer surface were identified as being in positively charged states, which led to high operational voltages of OFETs and degraded bias-stress stability. However, their impact on field-effect mobility was found to be minimal following any surface cleaning process. The conventional ultrasonic cleaning using acetone and isopropanol only partially removed contaminants, which provides limited improvement in reducing operational voltages and enhancing bias-stress stability. The subsequent ultrasonic cleaning with deionized water and UV-ozone treatment further removed contaminants. More importantly, these processes anchor hydroxyl species on the SiO2 surface, which impart negative charges for the neutralization of surface charge states, thereby comprehensively enhancing operational performance of devices. By leveraging the distinct properties of various solvents and treatments, an optimized surface cleaning protocol was proposed, in which the threshold voltage of OFETs was reduced to nearly 0 V, and the bias-stress stability was enhanced by approximately 300%.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2025
·
IF 3.2
Wang Nan,Tian Jie,Wang Xu,Wen Chengrong,Ai Chunqing,Song Shuang
Alginate could interact with chito-oligosaccharide and calcium ions to form a dense structure. However, the hydrophobic nature of oil may interfere with its interaction, potentially impacting its oil-protective function. Thus, the present study investigated the interactions between alginate mixed with antarctic krill oil (AKO), chito-oligosaccharide, and calcium ions to fabricate gel beads for preventing AKO oxidation. The stabilization of AKO emulsion by alginate was attributed to its viscous properties, with the optimal ratio between alginate (10 mg/mL) and AKO (300 mg/mL) determined to be 8: 2. Moreover, comprehensive assessment of the effect of the alginate/AKO ratio on the various properties of gel beads, it was revealed that as the ratio decreased, the beads exhibited smoother surfaces, reduced bursting strength, lower loading capacity, decreased swelling degree, and denser cross-sectional structures. The prepared gel beads masked AKO’s odor and achieved the controlled release of AKO in the gastrointestinal tract. FT-IR analysis revealed that AKO was immobilized as an inactive filler by electrostatic interaction between alginate and chito-oligosaccharide, non-covalent cross-linking between alginate and calcium ions, and hydrogen bonding in the gel network. Furthermore, encapsulation reduced conjugated diene, conjugated triene, and thiobarbituric acid reactive substances values of AKO by 94.91%, 93.51%, and 54.23%, respectively, versus free AKO. Hence, this study revealed the role of AKO in the gel beads, providing a reference for encapsulating AKO to prevent its oxidation. Graphical abstract
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JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Ying Hu,Xin Wu,Lin Zhou,Yan Kou,Ming Huang,Mao Chen
Epoxy resin, as a widely utilized insulating material in the field of electronic device encapsulation, faces challenges in achieving nondestructive disassembly of end-of-life devices and material recycling due to its three-dimensional cross-linked network structure, despite providing excellent mechanical properties. Additionally, it lacks autonomous repair capabilities when subjected to mechanical damage. To address these critical industry challenges, this study introduces dynamic disulfide bonds into the epoxy potting system, designing an epoxy vitrimer material with topologically reconfigurable network capabilities. This approach offers a viable solution for advancing the sustainable development of electronic encapsulation materials. The experiment employed an epoxy monomer containing dynamic disulfide bonds and a trifunctional thiol curing agent to prepare epoxy vitrimer potting insulation materials via a one-pot thiol-epoxy click reaction. The synthesized vitrimer demonstrates outstanding thermal stability ( T d = 318°C), electrical breakdown strength ( E b = 27.09 kV/mm), rapid stress relaxation behavior ( τ = 39 s), and superior hydrophobicity (contact angle = 118°). Furthermore, the encapsulated electronic components function normally, while the material's dynamic properties enable nondestructive recycling of components, autonomous repair of mechanical damage, and shape memory characteristics. The material maintains robust stability even after multiple high-low temperature cycles.
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MATERIALS LETTERS
·
2025
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IF 2.7
Ze Yin,Wenxu Tang,Ke Zhao,Binghao Chen,Jinggang Yang,Lei Sun,Shan Gao,Potao Sun
Microcracks and electrical treeing within polymer insulating materials are the primary causes of insulation failure. Early detection and repair of such damages are crucial. In this study, we leveraged the aggregation-induced emission (AIE) effect and a microcapsule self-healing system to design a UV-triggered smart insulating material capable of autonomous damage repair and self-reporting. The composite material demonstrated effective healing of both mechanical damage and electrical treeing channels, achieving damage-recovery rates of 91.67 % and 93.26 % for tensile strength and electrical strength, respectively. As the released healing agent was solidified within the damage path, it triggered intense AIE fluorescence, precisely indicating the location of damage.
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