OPTICAL MATERIALS
·
2023
·
IF 3.9
Yifei Cao,Haoyu Li,Xinyu Zheng,Siqing Wang,Chunming Zhou,Shiwei Chen,Peng Yang,Tianyuan Zhou,Hao Chen,Le Zhang
Zr 4+ ion doping is an effective method to enhance the optical and mechanical qualities of Y 2 O 3 transparent ceramics. In most previous studies, slowing down densification and inhibiting grain growth of Y 2 O 3 ceramic are generally recognized as the primary function of Zr 4+ additive during sintering. In this work, an interesting simultaneous precipitation phenomenon of Zr 4+ and Y 3+ ions was discovered and it directly led to the refinement of precursors and Y 2 O 3 powders. Consequently, the acting mechanisms of Zr additive should be demonstrated as the synergistic effect of refining precursor, producing oxygen interstitial and promoting solute-drag. Microstructure evolution and optical quality of Zr doped Y 2 O 3 ceramics were further investigated in detail. By doping 3.0 at.% Zr 4+ ions, Y 2 O 3 transparent ceramics with a transmittance as high as 82.3% at 1064 nm could be realized, after sintering at 1775 °C for 8h in vacuum. In general, this essential synergistic effect should be adequately considered in the preparation of heterogeneous ion doped transparent ceramics using the co-precipitation method.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haiyang Dai,Qinlong Shen,Jing Chen,Dewei Liu,Tao Li,Cui Shang,Zhenping Chen
Ceramic samples of Mn 1- x Zr x WO 4 (0.00 ≤ x ≤ 0.20) were prepared by a solid-state reaction to study changes in the structural, magnetic, and dielectric properties of multiferroic MnWO 4 caused by replacing Mn 2+ ions with Zr 4+ ions. The results indicate that Zr 4+ replacement caused lattice deformation but did not affect the monoclinic lattice structure of any of the MnWO 4 samples. The concentration of vacancies, investigated by positron annihilation lifetime spectroscopy, increased with as the Zr 4+ content x from 0.00 to 0.20. It was observed that Zr 4+ replacement enhanced the dielectric constant of Mn 1- x Zr x WO 4 but slightly increased the dielectric loss. The magnetization and transition temperatures (T AF3 and T AF2 ) of the Mn 1- x Zr x WO 4 system were increased by the Zr 4+ replacement, and the existing temperature range of the AF2 phase was extended upon the substitution of Zr 4+ for Mn 2+ . This study demonstrated that the magnetic properties of Mn 1- x Zr x WO 4 were closely related to the vacancy concentration and lattice distortion.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhengfei Xiang,Zhaoting Zeng,Tengfei Deng
In this study, 0.6Y 2 O 3 -0.4YCr 0.5 Mn 0.5 O 3 negative temperature coefficient (NTC) ceramics doped with different ZrO 2 contents were prepared using a two-step sintering method. The effects of Zr 4+ content on the microstructure and electrical properties of 0.6Y 2 O 3 -0.4YCr 0.5 Mn 0.5 O 3 were mainly investigated. For the microstructure, X-ray diffraction (XRD) reveals the presence of two main crystalline phases in the samples: Y 2 O 3 and YCr 0.5 Mn 0.5 O 3 . Scanning electron microscopy (SEM) reveals a clear two-phase appearance, and the porosity tends to decrease with the addition of ZrO 2 . Combined with energy dispersive spectrometer (EDS) to derive the distribution of the elements, Zr 4+ is mainly present in the Y 2 O 3 phase, with a small amount in the YCr 0.5 Mn 0.5 O 3 phase. In addition, the grain sizes of different groups were counted, and the grain size of Y 2 O 3 decreased from 2.73 ± 1.80 μm to 1.65 ± 0.93 μm with the increase of ZrO 2 content. For the electrical properties, the resistance-temperature curves were measured from 298.15 K to 1073.15 K, and all the samples exhibited NTC characteristics. And with the increase of ZrO 2 content, the resistivity increased from 1.91 × 10 7 Ω cm to 1.96 × 10 8 Ω cm, and the B 25/100 value decreased from 3315 K to 1310 K. In addition, the chemical state forms of the elements on the surface of the samples were analysed by X-ray photoelectron spectroscopy (XPS), and the valence states as well as the occupancy of the transition elements Cr and Mn were analysed in detail according to the principle of multiple splitting. Finally, the mechanism of influence on microstructure and electrical properties is explained by combining the theory of grain boundary migration and thermal ceramic conductivity.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jinqiang Wang,Zhaoyang Su,Nigel J.D. Graham,Hongkai Liu,Kai Sun,Wenzheng Yu
This paper focuses on the functionalization of double positively charged polyethylenimine (PEI)/Zr 4+ -polyamide (PA) nanofiltration (NF) membrane by connecting Zr 4+ with positively charged PEI-PA NF membrane surface. In particular, the properties of prepared PEI/Zr 4+ -PA NF membrane, performance on removing aquatic contaminants (Cr 3+ and trimethoprim), and its antifouling ability were evaluated in detail. In this regard, zirconium acetate was successfully adopted as the zirconium source for stable membrane surface charge control. Zr 4+ loading increased the hydrophilicity of the PEI-PA NF membrane, improved permeate flux, and enhanced the removal behavior of PEI/Zr 4+ -PA NF membrane especially when exposed to Cr 3+ and trimethoprim at high concentrations. Furthermore, effectiveness of PEI/Zr 4+ -PA NF membrane was not affected by high filtering degree, filtration cycle, and negatively charged macromolecules, such as bovine serum albumin (BSA). Also, antifouling ability of PEI/Zr 4+ -PA NF membrane could be further improved by continuously loading Zr 4+ .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Quan Yuan,Liwei Yan,Jinfeng Tian,Weiyi Ding,Zhengguang Heng,Mei Liang,Yang Chen,Huawei Zou
Silicon/phenolic hybrid resins are one of the most commonly used materials for thermal protection. However, the weak ability of SiO 2 generated by silicone during ablation to resist the impact of high-speed hot gas flow hinders further improvement of the performance. Therefore, in this work, the ultrahigh-temperature ceramic elements Zr 4+ and Hf 4+ were integrated into hyperbranched polysiloxanes in the form of coordination bond and then introduced into phenolic resin (PR), obtaining hybrid resin with excellent ablative resistance. During ablation, Zr 4+ and Hf 4+ will first undergo ceramization, producing ZrO 2 and HfO 2 . Subsequently, they will undergo a solid solution sintering reaction to produce complex-phase ceramic particles (Zr x Hf 1-x )O 2 , which are embedded in the SiO 2 liquid film and provide excellent pinning effect. This gives the hybrid resin excellent ablation resistance, whose linear ablation rate can be as low as 0.038 mm/s, a 58 % decrease compared to pure PR. This work not only provides a new pathway for ceramization through metal ion coordination bonding, but also provides a new way to prepare high-performance TPS materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Bo Meng,Shenyong Ren,Xinyue Zhang,Kang Chen,Wenkai Wei,Qiaoxia Guo,Baojian Shen
Brønsted acid of zeolite Y plays an important role in catalytic cracking reaction. However the proportion of strong Brønsted acid in conventional zeolite Y is small which limits the efficiency of transformation. This work described a way to achieve the goal of significant increasing the density of strong Brønsted acid via introducing Zr 4+ into the framework of zeolite Y. The density of strong Brønsted acidity increased from 0.085 (HY) to 0.208 mmol/g ([Zr,Al]-HY). Systematic characterization results showed that the introduction of Zr 4+ could produce more Si(1Al) but less Si(3Al) and Si(2Al) species in zeolite which was responsible for the high density of Brønsted acid. And abundant mesopores were also formed during the Zr 4+ implanting. For the catalytic cracking results of n-octane, the conversion on [Zr,Al]-HY was 1.67 times of that on conventional HY. The apparent activation energy of cracking n-octane on [Zr,Al]-HY was reduced to 73.3%, which indicated that the increase of strong Brønsted acid had significant effect on catalytic cracking. On the other hand, a large number of mesoporous structures of [Zr,Al]-HY provided a good foundation for the catalytic cracking of steric hindered 1.3.5-triisopropylbenzene (1,3,5-TIPB).
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Physics Impact
·
2025
·
IF 4.3
Zixuan Jiang,Bing Liu,Zehua Zhang,Lili Wang,Zhixu Jia,Dan Zhao
The co-doping effect of Zr 4+ ions on upconversion (UC) luminescent properties in visible region of Y 2 O 3 : Er 3+ and Y 2 O 3 : Er 3+ , Yb 3+ sub-microcrystals prepared by urea precipitation method has been investigated under 980 nm excitation. Compared with the original Y 2 O 3 : Er 3+ and Y 2 O 3 : Er 3+ , Yb 3+ sub-microcrystals, the UC luminescence of sub-microcrystals with similar size was enhanced after Zr 4+ ions co-doping. The UC luminescent properties have been discussed in detail via luminescence spectra, decay curve analysis and a suitable energy level diagram. The enhancement mechanism of UC luminescence in the two series of Zr 4+ ions doped sub-microcrystals was attributed to the complex crystal field around Er 3+ ions caused by Zr 4+ ions co-doping. After Zr 4+ ions substituted Y 3+ ions and entered the crystal lattice, the charge mismatch and lattice distortion made the crystal field more complex. This research contributes to the understanding of UC luminescent properties of lanthanide (Ln 3+ ) ions doped UC materials and their technological applications in fields such as bioimaging, drug delivery, and optical temperature sensors.
研究领域:
材料科学
·
光学
·
生物成像
·
药物递送
·
光学温度传感器
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2023
·Vol. 10
·期 8
·086201
·
IF 2.3
Bing Liu,Jingheng Liang,Lili Wang,Zian Cheak Tiu
β-NaYF4: Yb3+/Tm3+/Zr4+ microcrystals are synthesized by a facile hydrothermal route. The up-conversion (UC) luminescence and photoelectric effects are enhanced simultaneously with the introduction of Zr4+ ions under IR excitation. With the Tm3+ ions fluorescence spectra under 980 nm excitation, the blue and red emissions reached the highest intensity in the case of 4 mol% Zr4+ doping. Taking the advantage of Zr4+ stimulates the free electrons transfer from the valence band (VB) to the conduction band (CB) in β-NaYF4:Yb3+/Tm3+/Zr4+ microcrystals, the photocurrent reached the highest intensity in the case of 4 mol% Zr4+ doping at 780 nm excitation. The β-NaYF4: Yb3+/Tm3+/Zr4+ microcrystals with both enhanced UC luminescence and photoelectric properties are highly potential to contribute in photovoltaic and infrared sensors application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hezhen Wu,Huidong Tang,Qing Hu,Yanqiao Xu,Wentao Li,Xiaojun Zhang,Feng Jiang,Guo Feng,LianJun Wang,Wan Jiang
Recently, vacancy-ordered double perovskite phosphors have garnered significant attention due to their high quantum efficiency, elevated carrier mobility, and favorable fluorescence properties. Vacancy ordered double perovskite phosphors has poor fluorescence properties due to the high number of vacancies. The fluorescence characteristics and stability can be enhanced through strategic ion doping. This study synthesized Zr 4+ ion-doped Cs 2 SnCl 6 : 5 %Te using hydrochloric acid-assisted precipitation method. The inclusion of Zr 4+ ions in proper proportions facilitated Jahn-Teller structural distortion in Te 4+ , thereby enhancing the generation of bright yellow-green emission. The photoluminescence quantum yield (PLQY) achieved a peak of 70.9 % at a Zr 4+ ion doping level of 15 %. Furthermore, a water stability test was conducted on the phosphors. At 15 % doping with Zr ions, The Cs 2 Zr 0.15 Sn 0.8 Cl 6 : 5 %Te phosphors demonstrated a remarkable stability, which maintained 100 % of its initial fluorescence intensity after immersion in water for 14 h, proving the excellent stability of the phosphors against water exposure. A white light-emitting diode (WLED) with color coordinates of (0.3486, 0.364), a correlated color temperature of 4915 K, and a color-rendering index (Ra) of 86 was prepared using Cs 2 Zr 0.15 Sn 0.8 Cl 6 : 5 %Te phosphor. This development offers a novel and eco-friendly approach to solid state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Ying Liao,Yingqin Zhang,Aiwen Su,Yanli Zhang,Hongbin Wang,Wenrong Yang,Pengfei Pang
Protein kinase A (PKA) can regulate many cellular biological processes by phosphorylation substrate peptide or protein. Sensitive detection of PKA activity is critical for the PKA-related drug discovery and disease diagnosis. A new electrochemical biosensing method was developed for detection of PKA activity based on Zr 4+ -mediated DNAzyme-driven DNA walker signal amplification strategy. In this strategy, the special designed substrate peptide and a thiolated methylene blue-labeled hairpin DNA (MB-hpDNA) containing a single ribonucleic acid group (rA) could be anchored on the surface of gold electrode by Au–S bond. In the presence of adenosine triphosphate (ATP) and PKA, substrate peptide was phosphorylated and linked with walker DNA (WD) via the robust phosphate-Zr 4+ -phosphate chemistry. The linked WD hybridized with the loop region of MB-hpDNA to form a Mn 2+ -dependent deoxynuclease (DNAzyme), which cleaved the MB-hpDNA into MB-labeled fragment releasing away from electrode surface, resulting in a dramatic decrease of electrochemical signal and providing an electrochemical sensing platform for PKA activity detection. The response signal of the developed biosensor is proportional to the logarithm of PKA concentration in the range of 0.05 U mL −1 to 100 U mL −1 , with a detection limit of 0.017 U mL −1 at a signal to noise ratio of 3. Furthermore, the proposed method can also be applied for the evaluation of PKA inhibition and PKA activity assay in cell samples. Therefore, the proposed biosensor shows great promise as a universal tool for diagnostics and drug discovery of PKA-related diseases.
研究领域:
生物化学
·
分析化学
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xingyu Chen,Yeqing Guan,Zhaolin Zhong,Fenglin Wang,Wei Li,Haijun Mao,Zhuofeng Liu,Weijun Zhang
The effect of Zr 4+ substitution for Ti 4+ on the phase evolution and microwave dielectric properties of (Cu 1/3 Nb 2/3 ) 0.25 Ti 0.75- x Zr x O 2 (0 = x ≤ 0.35) ceramics prepared via conventional solid-state method has been investigated. With the increase of Zr substitution, the ceramics exhibit a gradual phase transition from a tetragonal rutile phase to an orthorhombic srilankite phase, where the synthesis of the srilankite phase at atmospheric pressure and temperature below 1200 °C in this study is reported for the first time. The crystal structure is tetragonal rutile type for the unsubstituted composition, orthorhombic srilankite type for the compositions with x > 0.30, and the compositions in between is a two-phase region with a mixture of rutile and srilankite. The Zr substitution has a great influence on the microstructure of the ceramics. In particular, for compositions where x > 0.1, the grain boundaries are surrounded by elongated powdery particles. The microwave dielectric properties of the ceramics are closely related to the phase transition process, in which Q × f is significantly improved and τ f decreases almost linearly with the increase of the content of srilankite phase. Optimum microwave dielectric properties with a permittivity of 35.1, a Q × f value of 7270 GHz, and a near-zero τ f of 9.0 ppm/°C are obtained in the ceramics with x = 0.3 sintered at 1150 °C for 4 h, which provides a new option for microwave devices requiring medium-permittivity dielectric ceramics .
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 7
·5492-5498
·
IF 2.22
Xu Lei,Xu Yuan
Ba(Zr x Ti 1− x )O 3 ceramics ( x = 0.15, 0.2, 0.25, 0.3) were prepared with solid-state reaction method. The ratio of Zr/Ti influences the crystal structure, micromorphology, ferroelectric and dielectric properties of BZT ceramics, which were characterized, respectively, by X-ray diffraction, scanning electron microscope, ferroelectric test system and dielectric test system. The X-ray diffraction patterns show that the zirconium titanate ceramic samples adopt cubic phase structure and no secondary phase. As the Zr 4+ content increases, the lattice constant increases and the grain size decreases. BZT ceramic sample with 15% zirconium content has the highest dielectric constant. As the Zr 4+ content increases, the dielectric constant is gradually decreased, and Curie temperature dropped from 334 to 226 K. The sample has the largest remanent polarization, when the zirconium ion content is 15%. Subsequently, the remanent polarization is reduced as the zirconium ion content increases.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
铁电材料
·
介电材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）