Materials
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2024
·Vol. 17
·期 24
·6251
·
IF 3.1
Xing-Hua Ma,Qi Qu,Haitao Wu,Zhenlu Zhang,Xingyi Ma
M 2+ N 4+ Nb 2 O 8 -type ceramics (where M = Mg, Ca, Mn, Co, Ni, Zn and N = Ti, Zr) are essential for satellite communication and mobile base stations due to their medium relative permittivity ( ε r ) and high quality factor ( Q × f ). Although ZnTi 0.2 Zr 0.8 Nb 2 O 8 ceramic exhibits impressive microwave dielectric properties, including an ε r of 29.75, a Q × f of 107,303 GHz, and a τ f of −24.41 ppm/°C, its sintering temperature of 1150 °C remains a significant barrier for integration into low-temperature co-fired ceramic (LTCC) technologies. To overcome this limitation, a strategy involving the partial substitution of Zn 2+ with Cu 2+ and the addition of LiF as a sintering aid was devised for ZnTi 0.2 Zr 0.8 Nb 2 O 8 . The dual impact of Cu 2+ partial substitution and LiF as a sintering enhancer facilitated the successful sintering of Cu 0.3 Zn 0.7 Ti 0.2 Zr 0.8 Nb 2 O 8 ceramics at a reduced temperature of 950 °C using the conventional solid-state reaction method. These ceramics exhibited excellent microwave dielectric properties. Notably, Cu 0.3 Zn 0.7 Ti 0.2 Zr 0.8 Nb 2 O 8 ceramic with 40 mol% LiF addition demonstrated optimal microwave dielectric properties without any reaction with a silver electrode at a sintering temperature of 950 °C, yielding ε r = 32, Q × f = 45,543 GHz, and τ f = −43.5 ppm/°C.
研究领域:
材料科学
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电子工程
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International Journal of Applied Ceramic Technology
·
2026
·Vol. 23
·期 3
·e70208
·
IF 2.6
He Ma,Zizheng Cai,Kun Tian,Feng Sun,Lijuan Zhou,Shuang Li
Silicon nitride ceramics are attractive candidates for substrate applications because they combine electrical insulation, mechanical robustness, and the capacity for efficient heat dissipation. Their practical thermal conductivity, however, is often restricted by lattice oxygen defects and grain-boundary phases generated during processing. In the present study, MgSiN 2 was incorporated into a Yb 2 O 3 –MgO additive system to regulate oxygen-related defects and to tailor the liquid-phase sintering behavior of Si 3 N 4 ceramics fabricated by gas-pressure sintering at 1850°C. The effects of MgSiN 2 content on densification, phase evolution, microstructural development, room-temperature thermal conductivity, and mechanical properties were systematically examined. The specimen containing 4 wt.% MgSiN 2 displayed the most balanced overall performance, with a relative density of 96.17%, a flexural strength of 912 MPa, a fracture toughness of 8.1 MPa·m 1/2 , and a Vickers hardness of 13.6 GPa. When the MgSiN 2 level was further increased to 6 wt.%, the room-temperature thermal conductivity rose to 83.1 W·m −1 ·K −1 , although the mechanical properties deteriorated because of reduced densification and microstructural coarsening. These results show that controlled MgSiN 2 addition provides an effective route for adjusting the oxygen state, microstructure, and overall performance of Si 3 N 4 ceramics.
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CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Fanggong Cai,Xiaobo Lei,Jiao Geng,Wei Sun,Jun Chen,Sude Ma,Qinyong Zhang
The homologous Pb m Bi 2n X m+3n (X = S, Se, Te) is expected as solar cells or thermoelectric materials. Herein, stable phases of ternary PbBi 2 S 4 microspheres were successfully synthesized by two solution-phase-methods assisting with EDTA-2Na in aqueous media, namely traditional chemical reaction under atmospheric pressure and hydrothermal method under high pressure. Field-emission scanning electron microscopy and X-ray diffraction were used to characterize and determine the morphology and structure of the product. EDTA-2Na plays critical roles in the crystallization process of uniform PbBi 2 S 4 microspheres. A mechanistic model is proposed to account for these experimental findings. Furthermore, the optical band gaps of PbBi 2 S 4 were investigated as well.
研究领域:
材料科学
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化学
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ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Fei Cheng,Ying Feng,Qinqin Su,Daidong Wei,Bin Wang,Yuewen Huang
In this work, a polycarboxylate comb-like polymer was used as grinding aid for ceramic slurry, and the effect of addition of this grinding aid on ceramic process property was highlighted. The grinding efficiency of the polycarboxylate grinding aid (PG) in terms of the particle size distribution and specific surface of unit volume of the ceramic slurry being ground were investigated. Consequently, the PG that was synthesized via free radical polymerization under the condition of an APEG/AA/MA molar ratio of 0.3:1:1, an initiator dosage of 5 wt%, and a reaction time of 6 h at 90 °C, provided better grinding efficiency than those of the triethanolamine and other commercial grinding aids. Specifically, with a dosage of 0.21% and 2 h of grinding, the d 97 and d 50 of ceramic slurry decreased from 13.956 μm and 2.043 µm to 3.739 µm and 0.561 µm, respectively. The cumulative distribution, frequency distribution and SEM results exhibited a uniform particle size distribution for ceramic ground with PG-C. Furthermore, the sintering experiment indicated that a lower processing temperature was capable of producing ultrafine ceramic. These improvements indicated the potential application of the PG as an efficiency ceramic grinding aid, which further facilitating the preparation of uniform ultrafine slurry by a sand mill.
研究领域:
材料科学
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陶瓷工程
·
化学工程
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Hanyang Gao,Guoxin Hu,Haijun Liu
Utilization of graphene (GE) in water is physically limited by its lack of functional groups, high hydrophobicity, and large interlayer van der Waals forces. Easy agglomeration of GE makes the preparation of GE-filled composites in an aqueous environment very difficult. Conventional methods solve this problem by introducing a surfactant to the system. However, the addition of a large amount of surfactant may hinder the performance of the composite. In this study, highly stable GE aqueous suspensions (remaining stable for more than 30 days) with a high concentration (1.5 mg/mL) were conveniently prepared by using graphene oxide (GO) as a stabilizer. A GE- and GO-filled rubber composite prepared by this GO–GE water suspension in an aqueous environment was also prepared and analyzed. It was found that a dual-network with dual functions was formed in the composite matrix: the GE network enhanced the electrical conductivity of the composite, while the GO network enhanced its mechanical properties. Our method is green, simple, and highly efficient, providing an alternative to improve GE’s dispersion in water and synthesize GE-filled composites in an aqueous environment.
研究领域:
材料科学
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化学工程
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Jing Wang,Tingting Li,Haigang Li,Gongke Li,Shixin Wu,Liansheng Ling
AuNPs-DNA probes remain a challenge to recognize the double-stranded DNA (dsDNA) from routine PCR product despite its success in the recognition of the single-stranded (ssDNA) DNA of asymmetry-PCR product. Here, a universal colorimetric PCR biosensor is established with oligonucleotide modified AuNPs by recognizing the dsDNA of PCR product based on triplex DNA formation with the assistance of a triplex DNA intercalator Ru(phen) 2 dppx 2+ . The strategy was applied to detect different length dsDNA, including short dsDNA 1 (49 bp) and long dsDNA 2 (321 bp), both of which had the good linear relationship between the absorbance and the logarithm of the concentration of the targets. Moreover, the limit of detection (LOD) for short and long length dsDNA was 0.5 pM and 0.05 fg, lower than those of the previously reported methods, respectively. This strategy also displayed high selectivity against dsDNA 1 and dsDNA 2. These results demonstrate a potential strategy to detect all length of dsDNA, providing new opportunities in the life science, diagnosis, and medicine.
研究领域:
生物化学
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分子诊断
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纳米医学
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FOOD CHEMISTRY
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2018
·
IF 4.946
Nan Wang,Huijuan Chai,Xuelin Dong,Qian Zhou,Lihua Zhu
Iron(III) ethylenediaminetetraacetate (Fe(III)EDTA) is widely used in iron fortification for reducing iron deficiency, and its determination is urgently needed. The present work developed a fluorescent method to straightforwardly determine Fe(III)EDTA by using photoluminescent carbon dots (C-dots) with the aid of F − ions as the masking agent of free Fe 3+ ions. In the presence of F − ions, only Fe(III)EDTA selectively quenched the photoluminescence of C-dots, and both Fe 3+ and Fe 2+ as well as other carboxylic acids have no effect on the emission of C-dots. The sensing mechanism was attributed to the ligand-tailored electron transfer process from C-dots to Fe 3+ . Under optimum conditions, this method showed a linear calibration plot over the Fe(III)EDTA range of 1.0–200 μmol L −1 and a detection limit of 0.4 μmol L −1 . The proposed method was successfully applied to determine Fe(III)EDTA in real samples with acceptable recoveries of spikes (95%−110%) and repeatability (RSD, 4.2%−9.5%).
研究领域:
分析化学
·
食品科学
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PubMed
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Materials Today Communications
·
2023
·
IF 3.8
Zhuo Xing,Juhai Weng,Chi Ma
A series of Zn 2- x Cu x GeO 4 ceramics were prepared by the solid-phase sintering method. Cu 2+ substitution for Zn 2+ facilitated the single-phase formation and benefited densification via lowering the sintering temperatures , hence thereby the microwave dielectric properties were largely improved. A representative composition with x = 0.08 revealed a homogenous Zn 2 GeO 4 phase with good microwave dielectric properties: ε r ∼ 7.47, Q × f ∼ 56,980 GHz, and τ f ∼ −13.9 ppm/°C when sintered at 1000 °C. To evaluate the potential application of low-temperature cofired ceramics (LTCC), sintering aids (B 2 O 3 ) were added to the x = 0.08 sample to reduce its sintering temperature to below 960 °C. A dramatic improvement in Q × f ∼ 107,415 GHz was observed with only 0.5 wt % B 2 O 3 addition. Chemical compatibility was confirmed via cofiring with silver electrodes at 940 °C. All the merits show promising potential for advanced substrates.
研究领域:
材料科学
·
电子材料
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Science China-Technological Sciences
·
2023
·
IF 4.6
Ren Hui,Zhang Zhen,Lu KaiLun,Shen YuanYuan,He ChaoLiang,Chen XueSi
Burn wounds are destructive skin traumas typically of irregular shape and large area. Prone to infection, they require frequent dressing replacement, and painless removal of dressings from burn wounds remains a major challenge. This study focuses on the dynamic characteristics and treatment difficulty of burn wounds. Hydrogel dressings based on glycol chitosan and propionaldehyde- or benzaldehyde-terminated 4-arm poly(ethylene glycol) were designed on the basis of Schiff base cross-linking networks. The hydrogels exhibited shape-adaptability, self-healing and fast-degradation properties, which makes these hydrogels suitable for burn wounds. Salvianolic acid B (SaB)-loaded hydrogel exhibited good antioxidant properties in vitro . In a rat model of deep second-degree burn wounds, the SaB-loaded hydrogel could quickly reduce wound temperature, regulate wound oxidant microenvironment, promote angiogenesis, and accelerate wound healing. Thus, the drug-loaded hydrogel shows significant potential as a first-aid dressing for treatment of burn wounds.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Nan Li,Le Yang,Xingxiang Ji,Wei Chen
Flexible piezoresistive sensors are crucial for wearable electronics. Conventional approaches predominantly enhance sensitivity and detection range through innovations in conductive materials, sensor substrates, or sophisticated microstructure engineering. This study presents a novel approach using commercial band-aid as multifunctional piezoresistive sensor substrates, utilizing their inherent structural properties. This substrate is functionalized through immersion into a multi-walled carbon nanotubes (MWCNT) and cellulose nanofibers (CNFs) composite dispersion, forming a nanoscale conductive film while preserves the native microscale patterns. These patterns amplify localized pressure responses, thereby enhancing sensitivity. Simultaneously, the conductive band-aid is assembled into a millimeter-scale arched architecture that optimizes the sensitivity-range trade off: under low stress, the minimal initial contact area optimizes sensitivity, while the arch design stabilizes large deformations, extending the measurable pressure range. This cross-scale integration synergizes stress redistribution and dynamic conductive pathway adjustments, enhancing contact area homogeneity under pressure. The resultant sensor demonstrates exceptional performance including high sensitivity (66.8 kPa −1 ), broad detection range (0–219.2 kPa), rapid response/recovery times (1 ms/4 ms), exceptional durability (10,000 cycles), and ultra-low detection limit (7 Pa). Moreover, the methodology addresses scalability and cost barriers by utilizing mass-produced, biocompatible band-aids as off-the-shelf substrates, bypassing complex and costly nanofabrication processes. By harmonizing material accessibility, structural ingenuity, and multi-functional sensing performance, this approach not only resolves enduring trade-offs between sensitivity, range, and durability in wearable sensor design but also establishes a scalable platform for next-generation epidermal electronics.
研究领域:
材料科学
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柔性电子学
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可穿戴传感器
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纳米复合材料
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生物医学工程
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Desalination and Water Treatment
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2024
·
IF 1
Zhaoyang Su,Xing Li,Yanling Yang
To provide an insight into aluminum (Al) control during the treatment of micro-polluted water, recycling ferric water treatment sludge (Fe-WTS) as an alternative approach was innovatively investigated. Particular attention was paid to the recycling ratio of Fe-WTS when coagulated at an optimized dosage of both Al 2 (SO 4 ) 3 and polyaluminum chloride (OH/Al = 2.0, denoted as PAC 20 ) respectively. Coagulation performance, i.e., turbidity, organics and Al speciation were also examined. A morphological analysis, characterized via floc size and fractal dimension, was further conducted to explore the fundamental floc operational parameters and to elucidate the mechanism of different Al species removal. The results indicate that an appropriate recycling ratio yields improvements in residual Al control. In comparison, Fe-WTS is more effective in dissolved Al (Al D ) removal when coagulated by Al 2 (SO 4 ) 3 , while is proper to the reduction of colloidal Al (Al CO ) when coagulated by PAC 20 . Flocs properties are significantly correlated with Al speciation during the treatment. Specifically, floc size is proportional to Al CO removal rate, however, the value of floc fractal dimension is inversely proportional to Al D removal rate.
研究领域:
环境工程
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水处理
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废物回收
·
混凝化学
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Pengdou Yun,Maolin Zhang,Peng Zhang,Yubin Li,Fan Ren,Biaolin Peng,Dongyan Zhang,Zhimin Li,Yangxi Yan
Lead-based ceramics have been extensively studied because of their superior electrical properties and thermal stability. However, a major challenge for PYN-PHT-based ceramics is their high sintering temperature, which typically exceeds 1200 °C. At such elevated temperatures, severe lead volatilization occurs, resulting in deviations from the ideal stoichiometric ratio and subsequent degradation of electrical performance. To address this issue, sintering aids were introduced, effectively reducing the sintering temperature from 1175 °C to 1075 °C. This approach not only significantly suppressed lead volatilization but also promoted ceramic densification, demonstrating high effectiveness. Specifically, the as-prepared PYN-PHT-0.8(Cu 2+ +Sb 5+ ) ceramics exhibited a high piezoelectric coefficient of up to 610 pC/N, whereas previous processes required temperatures close to 1200 °C. Furthermore, the prepared ceramics showed enhanced stability at high-temperatures. Overall, these findings provide a practical strategy for improving the durability, efficiency, and reliability of piezoelectric components operating under harsh service conditions.
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