JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 33
·2137
·
IF 2.8
Zeng Fanjun,Meng Liufang,Yuan Changlai,Zhu Baohua,Liu Xiao,Xiao Hequn,Wu Jianwang,Zhou Changrong,Chen Guohua
With the rapid development of 5G communication technology, higher requirements have been imposed on microwave dielectric ceramic materials. Ceramic materials with low dielectric constant, excellent temperature stability, and low sintering temperature have become current research focus. In this study, (1- x )Li 2 MoO 4 - x BaV 2 O 6 (LM- x BV, x = 0.7, 0.78, 0.8, 0.9) ceramics were successfully prepared via the solid-state reaction method, and their microstructures, microwave dielectric properties and antenna simulation were investigated. XRD and Raman spectroscopy confirmed the coexistence of BaV 2 O 6 , BaMoO 4 and LiVO 3 phases in all LM-BV systems. Bulk density, Q × f and τ f values approximately increased, and ε r decreased, with BV contents increased at optimum sintering temperature. LM-0.8BV ceramic was obtained with excellent microwave dielectric properties of ε r = 9.32, Q × f = 11246.3 GHz and τ f = 2.8 ppm/ ℃. The DRA designed based on Li 2 MoO 4 -0.8BaV 2 O 6 ceramics demonstrated excellent performance at 7.88 GHz, including a return loss of ~ -33.51 dB, high efficiency (~ 95%), a peak gain of ~ 7.3 dB, and a bandwidth of 500 MHz. These results indicated that the material had promising potential for applications in microwave devices within Low-Temperature Co-fired Ceramic (LTCC) technology.
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npj Quantum Materials
·
2025
·
IF 6.2
Lu Jia-Yi,Lin Yi-Qiang,Ye Kai-Xin,Zhao Xin-Yu,Li Jia-Xin,Zhang Ya-Nan,Li Hao,Lv Bai-Jiang,Yuan Hui-Qiu,Cao Guang-Han
Recent studies suggest that the tetragonal phase of the Ruddlesden-Popper (RP) bilayer nickelate, La 3 Ni 2 O 7 or La 2 PrNi 2 O 7 , which is stabilized under high pressures, is responsible for high-temperature superconductivity (HTSC). In this context, realization of the tetragonal phase at ambient pressure could be a rational step to achieve the goal of ambient-pressure HTSC in the nickelate system. By employing the concept of Goldschmidt tolerance factor, we succeed in stabilizing the tetragonal phase by aluminum doping together with post annealing under moderately high oxygen pressure. X-ray and neutron diffractions verify the tetragonal I 4/ m m m structure for the post-annealed samples La 3 Ni 2− x Al x O 7− δ (0.3 ≤ x ≤ 0.5). The Al-doped samples, including the tetragonal ones, show semiconducting properties, carry localized magnetic moments, and exhibit spin-glass-like behaviors at low temperatures, all of which can be explained in terms of charge carrier localization. Furthermore, high-pressure resistance measurements on post-annealed samples reveal that even a low Al doping ( x = 0.05) suppresses superconductivity almost completely. This work gives information about the effect of nonmagnetic impurity on metallicity as well as superconductivity in bilayer nickelates, which would contribute to understanding the superconducting mechanism in RP nickelates.
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Nature Communications
·
2025
·
IF 15.7
Su Keying,Yang Shan,Liang Yujia,Sun Dongmei,Gong Mingxing,Tang Yawen,Qiu Xiaoyu
Single-atom catalysts are highly active for specific reactions; however, their sinter-resistance and clean surfaces make it difficult to impart them with a “smart” property. Herein we design a thermosensitive single-atom Rh 1 -Pd nanosheets (NSs) by employing amino functionalized poly( N -isopropylacrylamide) as thermal responsive gate for the “open”/“closed” control of electro-catalytic activity. Using formic acid electro-oxidation as model reaction, the thermosensitive Rh 1 -Pd NSs exhibit high mass activity (2.29 A mg PGM -1 ), strong poisoning resistance, and reversible thermo-responsibility at a lower critical solution temperature (LCST) of 35 o C. In-situ spectroscopy and theoretical investigations reveal that the d-electron deficient Rh 1 -Pd NSs favor the direct formate pathway and weaken the binding of self-poisonous species, contributing to the high activity and anti-self-poisoning talent. Most importantly, for the direct formic acid fuel cells (DFAFCs), the thermosensitive Rh 1 -Pd NSs exhibit a high power density operated below the LCST, while the power drops sharply once above the LCST, realizing the intelligent battery thermal protection for DFAFCs.
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ANALYTICAL SCIENCES
·
2025
·
IF 2
Xia Shaojie,Yang Zhenyuan,Sun Xiaohui,Huang Junjie,Peng Kuan,Wang Yonghong
Ochratoxin A (OTA), a highly toxic mycotoxin, extensively contaminates a wide range of food commodities. Given increasing demands for sensitive and user-friendly detection platforms, we developed a colorimetric OTA biosensor leveraging copper-silver nanoclusters (Cu/Ag NCs), whose peroxidase-like activity is augmented via G/C-rich DNA hybridization. The system employs two tailored DNA strands: a template strand featuring a cytosine-rich domain for NC synthesis flanked by terminal recognition segments and an enhancer strand containing a guanine-rich signal amplification domain and a complementary linker. Upon OTA binding with the aptamer, the apt-template complex dissociates, facilitating template-enhancer hybridization to form G/C-rich double-stranded DNA. This structural transition substantially enhances the peroxidase-like activity of DNA-Cu/Ag NCs, accelerating the oxidation of 3,3′,5,5′-tetramethylbenzidine by H 2 O 2 while simultaneously amplifying the colorimetric signal. Quantitative OTA detection is accomplished by monitoring this dynamic color response. The biosensor demonstrates a semi-log linear detection range from 5.0 nM to 1.0 μM with a detection limit of 5.0 nM. Furthermore, the specific test has high selectivity for other common mycotoxins, and its applicability has been validated through real sample analysis, suggesting that the DNA-Cu/Ag NCs biosensor used for OTA detection holds promising practical applications in food samples. Graphical abstract
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International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 33
·期 1
·177-190
·
IF 7.2
Dong Yinrui,Yang Yongbin,Wang Lin,Duan Qianqian,Li Qian,Zhang Yan,Jiang Tao
Bentonite is a necessary binder in producing pellets. Its excessive use reduces the iron grade of pellets and increases production costs. Minimizing bentonite dosage is essential for producing high-quality iron ore pellets. Addressing the gap in the application of organically-intercalated modified bentonite in the pelletizing field, this study introduces an innovative modification process for bentonite that employs the synergistic effect of mechanical force and dimethyl sulfoxide to enhance the intercalation of organic compounds within bentonite, thus significantly enhancing its binding performance. The colloid value and swell capacity of modified bentonite (98.5 mL/3g and 55.0 mL/g) were much higher than the original bentonite (90.5 mL/3g and 17.5 mL/g). With the decrease of bentonite dosage from 1.5wt% to 1.0wt%, the drop number of green pellets from a height of 0.5 m and the compressive strengths of roasted pellets using the modified bentonite (6.0 times and 2916 N per pellet) were significantly higher than those of the original bentonite (4.0 times and 2739 N per pellet). This study provides a comprehensive analysis of the intercalation modification mechanism of bentonite, offering crucial technical insights for the development of high-performance modified bentonite as iron ore pellet binders.
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Journal of the Australian Ceramic Society
·
2025
·
IF 2.1
Qian Kaichen,Fan Jintai,Shen Zongyun,Li Kai,Zhou Weiwen,Feng Minghui,Jiang Benxue,Zhang Long
The influence of Gd 2 O 3 phase on microstructure, optical, mechanical and thermal properties in Gd 2 O 3 -MgO nanocomposite ceramics was investigated. A self-propagating high-temperature synthesis (SHS) method was adopted to synthesize Gd 2 O 3 -MgO nanopowders. The pressureless sintering and hot isostatic pressing (HIP) technique were applied to obtain IR-transparent composite ceramics. The Gd 2 O 3 can be stabilized as the cubic structure with 10 at% Y-doping in Gd 2 O 3 -MgO nanocomposite ceramics (named GYM). Optical and mechanical properties of the GYM were compared with the Gd 2 O 3 -MgO without Y-doping samples (named GM) in which Gd 2 O 3 was monoclinic. The flexural strength, emittance of Gd 2 O 3 -MgO nanocomposite ceramics at high temperature were measured for the first time as far as we know. The comparison demonstrated that the GM exhibiting a more promising potential application performance for MWIR windows, with an in-line transmittance of 79.2–83.3% at 3–5 μm, Vickers hardness of 9.6 GPa, flexural strength of 508 MPa, emissivity of 0.02 at 4 μm (800 ℃) and the Hasselman mild-thermal-shock figure of merit R’ =2.0.
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FIBERS AND POLYMERS
·
2025
·
IF 2.3
Xu Jiang,Cui Ao,Chen Wenjing,Wang Rui,Hao Longyun
In this study, polypyrrole (PPy) coatings were fabricated on alginate nonwoven fabrics (ANFs) through electrochemical polymerization in a constant current mode, assisted by an indium tin oxide (ITO) conductive glass electrode. The effects of two anionic surfactants and two cationic surfactants on the polymerization process were compared. Among them, anionic DNS-86 exhibited the highest negative zeta potential, which significantly improved the dispersion of Py monomers and facilitated their uniform polymerization on ANFs. The mechanism of Py polymerization assisted by anionic surfactant was analyzed, revealing its dual roles as a surfactant and dopant. Characterization techniques including FTIR, XPS, and SEM confirmed the successful synthesis of PPy. The PPy coatings significantly increased the hydrophobicity of the ANFs while maintaining their flexibility. The resulting PPy-ANFs exhibited appreciable electrical conductivity and photothermal properties. This research would provide a new insight into the preparation of conductive polymers on green textile substrate for acquiring functionality.
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Cancer Nanotechnology
·
2025
·
IF 4.8
Zhou Youwei,Cheng Sheng,Shu Lei,He Wenzhu,Chen Ying,Wang Yan,Li Xuqing,Wei Zhaolian
Objective The targets and active components that affect the prognosis of cervical cancer remain unclear. Methods Three microarray datasets were collected for differentially expressed genes (DEGs) screening. The pathway, function, protein interaction and prognosis were analysed. The active components, related targets, the active ingredient-target gene network were conducted. The protein expression of the hub gene was validated through immunohistochemistry and Nanodrugs Que-Fe NDs were prepared and validated by in vitro cellular functionalization experiment. Results 162 upregulated and 145 downregulated DEGs were screened out, including 10 hub genes, which were mainly clustered in DNA replication, cell division, proliferation, and cycle. The results of active ingredient-target gene network showed that the traditional Chinese medicine quercetin has the potential therapeutic effect on cervical cancer via targeting PCNA. Experiments focused on cellular functionalization demonstrated that the synthesized Que-Fe nanodots (NDs) were capable of decreasing the levels of proliferating cell nuclear antigen (PCNA) expression and suppressing the in vitro proliferation of HeLa cells. Conclusion The growth of cervical cancer HeLa cells was suppressed in vitro by Que-Fe NDs. This finding indicates a promising novel therapeutic target that warrants additional investigation.
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npj Flexible Electronics
·
2025
·Vol. 9
·期 1
·1-10
·
IF 15.5
Hu Qiyun,Wu Zikun,Tian Ye,Wang Jiaxin,Pan Zhangqi,Yu Yang,Cheng Yifan,Yang Yueying,Tang Hanchuan,Zang Jianfeng
Underactive bladder (UAB) patients experience straining to void and typically cannot sense bladder fullness. Previous closed-loop bladder volume control systems are limited in neurogenic UAB patients and face infection risk due to wired connections. Here, we propose an intelligent bladder volume control system (IBCS) combining an implantable meshed magnetic soft robot (MMR) with a wearable magnetic field sensor. The MMR, tightly sutured to the bladder, compresses the bladder to facilitate urination under magnetic actuation, achieving a voiding efficiency of 94.8%. The wearable magnetic field sensor outside the abdomen achieves continuous and wireless monitoring of bladder volume with a 4.8% error in time. The MMR was validated on a UAB pig model, demonstrating a pressure increase of up to 33 cmH 2 O and voiding efficiency of over 83%. Our IBCS provides a biocompatible solution for wireless and continuous bladder volume management by integrating wearable sensors and magnetic robotics.
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Journal of Superconductivity and Novel Magnetism
·
2025
·Vol. 38
·期 6
·231
·
IF 1.7
Liu Wanxia,Gao Yuxia,Li Yaning,Li Yulong,Ren Weijie,Sun Xin,Li Xiaofeng,Wang Mingli
The synthesis, structure, and magnetic properties of Ba 3 REB 9 O 18 (RE = Dy-Yb) compounds were investigated. Rietveld Refinement of the X-ray diffraction (XRD) data confirms that all compounds crystallize in a hexagonal Ba 3 YB 9 O 18 -type structure with space group P 6 3 /m (No. 176) and Pearson symbol hP 62. The lattice parameters a and c increase linearly with the increasing ionic radii of the RE 3+ ions. RE 3+ ions form two-dimensional triangular layers in the ab plane, which are separated by non-magnetic Ba/B-O polyhedra. The magnetic susceptibility measurement reveals no long-range magnetic order or spin glass behavior in any of the compounds above 2 K. The negative Curie-Weiss temperatures indicate dominant antiferromagnetic (AFM) exchange interactions between the RE 3+ ions. The combination of triangular lattice and antiferromagnetic interaction suggests this family of compounds is a promising system for researching magnetic frustration.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-14
·
IF 14.7
Xue Fangchao,Zhao Shanlan,Tian Hao,Qin Haoxiang,Li Xiaochen,Jian Zhao,Du Jiahui,Li Yanzhao,Wang Yanhong,Lin Lin,Liu Chen,Shang Yongning,He Lang,Xing Malcolm,Zeng Wen
During myocardial infarction, microcirculation disturbance in the ischemic area can cause necrosis and formation of fibrotic tissue, potentially leading to malignant arrhythmia and myocardial remodeling. Here, we report a microchanneled hydrogel suture for two-way signal communication, pumping drugs on demand, and cardiac repair. After myocardial infarction, our hydrogel suture monitors abnormal electrocardiogram through the mobile device and triggers nitric oxide on demand via the hydrogel sutures’ microchannels, thereby inhibiting inflammation, promoting microvascular remodeling, and improving the left ventricular ejection fraction in rats and minipigs by more than 60% and 50%, respectively. This work proposes a suture for bidirectional communication that acts as a cardio-patch to repair myocardial infarction, that remotely monitors the heart, and can deliver drugs on demand.
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Frontiers of Earth Science
·
2022
·Vol. 17
·期 1
·251-261
·
IF 2.273
Chen Yu,Zhao Hao,Xia Mingzhe,Cheng Hongfei
The sharp increase in the demand for lithium (Li) for high-energy-storage battery materials due to its high specific energy and low negative chemical potential render Li a geopolitically significant resource. It is urgent to develop a low-cost, efficient method to improve lithium extraction. Herein, Li ion (Li + ) adsorption in coal-bearing strata kaolinite (CSK) was studied. The effects of pre-activation acid leaching (meta-kaolinite/H 2 SO 4 , MK-HS) and dimethyl sulfoxide intercalation (coal-bearing strata kaolinite/dimethyl sulfoxide, CSK-DMSO) on the Li + adsorption capacity were studied under the same adsorption conditions. The results indicated that the adsorption was completed in 60 min under alkaline conditions (pH = 8.5), a high solution concentration (400 mg/L), and a low dosage (1 g/100 mL); and the comprehensive adsorption capacity is MK-HS > CSK-DMSO > CSK. Furthermore, the DMSO intercalation caused the interlayer spacing of the CSK to increase, which provided more space for Li + to enter and increase the adsorption capacity. After thermal pre-activation and acid leaching, structural failure and lattice collapse resulted in the presence of more micropores in the MK-HS, which resulted in a 10-fold increase in its specific surface area and caused coordination bond changes (Al(VI) to Al(IV)) and leaching of aluminum (Al) from the lattice. It is proposed that these structural changes greatly improve the activity of CSK so that Li + cannot only adsorb onto the surface and between the layers but can also enter the lattice defects, which results in the MK-HS having the best adsorption performance. Combined with the adsorption kinetics analysis, the adsorption methods of CSK and two modified materials include physical adsorption and chemical adsorption. In this study, the adsorption capacity of CSK and its modified products to Li were explored, providing a new option for the reuse of CSK and the extraction of Li.
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