JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Zezhen Yin,Yun Zhang,Shihua Ding,Tianxiu Song,Xiaoning Li,Jiaying Dan
Low permittivity LiAl 1- x Li x O 2- x ( x = 0–0.02) ceramics were prepared by conventional solid-state reaction method. XRD analysis indicated that the system remained single phase solid solution in the whole range of x examined. Li + heterovalent substitution for Al 3+ generated oxygen vacancy O vac , and enhanced the relative density from 94.33% to 97.13%. The dielectric constant ε r showed near linear variations versus sintering temperature and x value. Their relations mainly depended on the combined effects of relative density and dielectric polarizability . The quality factor Q×f was more than doubled from 15,647 GHz to 31,627 GHz, due to the packing fraction enlargement and covalent bond strengthening. The variation of temperature coefficient of resonance frequency τ f was explained from the view of oxygen bond valence. When x = 0.01, the ceramic exhibited the best microwave dielectric properties with ε r = 5.37, Q×f = 31,627 GHz and τ f = −104.2 ppm/°C when sintered at 1300 °C for 5 h.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2019
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IF 2.12
Zhenyuan Yang,Daqiang Wu,Ke Dai,Shiquan Cao,Zongchen Li,Heyan Huang,Zhibin Shang,Hua Liang,Minhao Yan,Suyuan Xie
As Al 3+ is detrimental both to human and other organisms, a simple sensor, acylhydrazone AhzF , is synthesized in one step and its structure is confirmed by single crystal X-ray diffraction. AhzF shows specific fluorescence turn-on response for Al 3+ over other metal ions at UV 365 nm, observed by naked-eyes. Its detection limit can reach to 1.11 × 10 −9 M in ethanol. Meanwhile, AhzF at low concentration can detect Al 3+ with excellent interference resistance to typical disturbing metal ions including Cu 2+ and Fe 3+ . For the first time, concentration influence of Fe 3+ during AhzF detecting Al 3+ has been explored and it has been found that the fluorescence of AhzF-Al 3+ is partly quenched by Fe 3+ while with no influence by Cu 2+ at high concentration (above 10 −6 M), indicating its good low concentration advantage during Al 3+ detection. The binding mode exhibits a 1:1 M ratio between AhzF and Al 3+ , which are confirmed by titration test, Job’s plot, 1 H NMR spectra and mass spectrum . It also exhibits good reusability by alternate addition of Al 3+ and EDTA to the AhzF solution. The pH effect tests suggest its good sensitivity from pH 4 to pH 10 and AhzF can recognize labeled Al 3+ in tap water directly by naked eyes, which makes it possible for the application in real environment.
研究领域:
化学传感器
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环境科学
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分析化学
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DOI
高影响因子
LUMINESCENCE
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2021
·Vol. 36
·期 6
·1469-1475
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IF 2.464
Xiping Mei,Dongxiu Wang,Lin Zhang,Junfen Li,Chuan Dong
Fifty-four Eucommia ulmoides leaves were subjected to a hydrothermal technique to synthesize carbon dots (CDs) of 3.55 ± 1.45 nm size. The nanomaterial possessed excellent stability and strong fluorescence emission (φ f 42.3%). In a neutral buffer solution, the fluorescence signals of CDs solution were enhanced by aluminium ion without interference from other ions. Degree of enhancement correlated linearly with the Al 3+ content in the range 0.01–2.5 mM. Response of this method was fast and sensitive (detection limit was 23 nM). The CDs performed successfully as a sensitive sensor for trace Al 3+ determination in water samples, and satisfactory results were obtained.
研究领域:
纳米材料科学
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环境监测
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分析化学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 11
·2886
·
IF 5.076
Chao Bai,Shi He,Huai-Ming Hu,Hui Zeng,Feng Zou,Ji-Jiang Wang
A europium(III) hybrid material Eu(tta)3bpdc-SiO2@mTiO2(Htta = 2-thenoyltrifluoroacetone, H2bpdc = 2,2′-bipyridine-3,3′-dicarboxylic acid) was successfully designed and synthesized by the covalent grafting complex Eu(tta)3bpdc to SiO2@mTiO2core–shell nanosphere. The FT-IR, PXRD, XPS, TEM, HRTEM, SAED, TGA and PL were performed to characterize these materials. The results indicate that core–shell nanosphere structure and anatase crystallites of SiO2@mTiO2are retained well after grafting the europium complex. Hybrid material Eu(tta)3bpdc-SiO2@mTiO2displays uniform nanosphere structure, bright red color and long lifetime, which can serve as a multicolor emission material modulated by using Al3+ions via the cation exchange approach under a single-wavelength excitation. To the best of our knowledge, this work is the first multicolor emissive sensor for Al3+ions based on the lanthanide hybrid material.Keywords:lanthanide hybrid materials;SiO2@mTiO2core–shell nanosphere;bipyridine derivative;multicolor luminescence
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 20
·2214886
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IF 19
Cong Wu,Hongsheng Shi,Lianqi Zhao,Xin Chen,Xinshui Zhang,Chang Zhang,Jiameng Yu,Yinjie Lv,Ran Wei,Tianyi Gao,Jin Xie,Yi Yu,Wei Liu
Electrochromic energy storage devices (EESDs) are incorporating electrochromic and energy storage functions, which can visually display energy storage levels in real-time to promote the next generation of transparent battery development. However, their performances are still limited for practical applications. Herein, a self-powered EESD based on complex niobium tungsten oxide is designed using aqueous Zn 2+ and hybrid Zn 2+ /M n+ (M n+ = Al 3+ , Mg 2+ , and K + ) electrolytes. The results reveal that the use of Zn 2+ /Al 3+ hybrid electrolyte achieves superior electrochromic performances including a short self-coloring time, high optical contrast, and excellent cyclic stability. Furthermore, it is also found that the self-coloring process is accompanied by a high discharged capacity of niobium tungsten oxide, with high optical modulation in the Zn 2+ /Al 3+ hybrid electrolyte. The detailed mechanism on the performances of EESD using various electrolytes is systematically studied. This work provides a simple and effective strategy for an aqueous and self-powered EESD with high optical contrast and good cycle stability.
研究领域:
材料科学
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电化学
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储能技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Hang Feng,Yue Leng,Tiandong Chen,Yanxia Sun,Chunxi Hai,Yuan Zhou
Due to the scarcity and high cost of cobalt resources, the development of cobalt free batteries is considered to be the next stage of power battery research. Layered LiNi 0.9 Mn 0.1 O 2 has higher energy density and better magnification performance with good prospects. However, its fragile structural stability and surface interface problems result in inferior cycle performance and rate capability compared to cobalt-containing cathode materials with the same Ni content. In this study, low magnetic resistance Al 3+ is used as a doping element to enhance the structure of the material and inhibit Li/Ni disordering. As expected, The Ni-rich, Co-free cathode material doped with 2 mol% Al 3+ showed the best structure and interface stability, exhibiting a capacity of 166.1 mAh·g −1 at a rate of 1 C after 180 cycles in the voltage range of 2.7–4.3 V, which was higher than that of untreated LiNi 0.9 Mn 0.1 O 2 and other materials with Al 3+ doping. Al 3+ doping enhanced the material's rate and cycle performance. Cycling at an ultra-high rate of 5 C, the capacity retention rate reaches 86.4% after 100 cycles. The effectiveness of the modified method has been demonstrated in this study, providing a theoretical basis for the commercialization of the material to some extent.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 5
·807
·
IF 3.9
Zhiping Zhao,Zhixia Wang,Yanbing Tong,Jinru Sun,Ming Ke,Weiyu Song
The search for inexpensive, environmentally friendly, and highly effective catalysts to activate C-H bonds in propane dehydrogenation (PDH) reactions is still a major challenge. Co-based catalysts have gained significant attention in recent years due to their excellent ability to activate C-H bonds and their high selectivity towards olefins, despite being a non-noble and environmentally unfriendly metal. However, further improvements are necessary for practical utilization, particularly in terms of activity and anti-carbon deposition capacity. In this study, we synthesized Al2O3nanorods with abundant pentacoordinated Al3+(Al3+penta) sites. The supported Co on the Al2O3nanorod (Co/Al2O3-NR) exhibited higher selectivity (>96% propylene selectivity) and stability (deactivation rate 0.15 h−1) compared to Co supported on an Al2O3nanosheet with fewer pentacoordinated Al3+sites. Various characterizations confirmed that Co(II) mainly exists as CoAl2O4rather than Co3O4in the form of Co/Al2O3-NR, which inhibits the reduction of Co(II) to Co0and accordingly improves catalyst stability.Keywords:propane dehydrogenation;metal oxide;alumina;spinel
研究领域:
化学工程
·
催化材料
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Enke Feng,Guangchao Zheng,Xue Li,Mengzhen Zhang,Xiaoqin Li,Xinning Han,Linan Cao,Zhiqiang Wu
Low-temperature tolerant and solvent-resistant soft electronic devices have received increasing attention due to their excellent adaptability under multiple environments. Herein, the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and zwitterionic betaine (ZB) are introduced into the Al 3+ cross-linked polyacrylic acid (PAA) networks to construct a multipurpose hydrogel (PAA-Al 3+ /PEDOT:PSS/ZB), which exhibits superior stretchability (1457 %), tensile strength (1.43 MPa), freeze-tolerance (−35 °C) and solvent-resistant capability. Furthermore, a strain sensor with multi-environmental stability is fabricated based on this hydrogel, which could not only accurately monitor the different human motions (finger bending, writing, swallowing, breathing, walking, head-up/down and wrist-up/down) at room temperature , but also reliably distinguish the various mechanical deformations in diverse solvent media (water, cyclohexane and methylbenzene) and harsh climatic condition (−35 °C). In addition, a flexible tube-shaped PAA-Al 3+ /PEDOT:PSS/ZB hydrogel is also successfully developed in the specific reaction mold, which can be utilized as a soft connection for the tap or two severed glass tubes to transport different liquids benefiting from the significant mechanical toughness and anti-swelling property. It is anticipated that the as-prepared hydrogel may be a promising flexible material with multi-environmental stability applying in biomedical devices, soft robotics, electronic skins and wearable sensors under complex environments.
研究领域:
材料科学
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生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Tianqi Liu,Xuejuan Wan,Youwei Yao
A Rhodamine B based dual-response sensor was developed for the independent sensitive and selective fluorescence sensing of Pb 2+ and Al 3+ . Initially, TQ1 exhibited one major fluorescence emission peak centered at 461 nm in ethanol/HEPES solution (1/5, pH 7.4), where HEPES was 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid. After the addition of Pb 2+ , an obvious red shift of 55 nm in fluorescence emission can be clearly observed, accompanied by a fluorescence color conversion, from bluish violet to greenish yellow under 365 UV light. As for Al 3+ , the fluorescence emission of TQ1 experienced a much more remarkable red shift of 124 nm, and its fluorescence color also changed to red. Furthermore, the fluorescence sensing process of Pb 2+ and Al 3+ were completely independent and free from interference of each other via changing the buffer concentration. Detection limit of the probe TQ1 towards Pb 2+ and Al 3+ were 8.3590 × 10 −7 M (linear range 1.6–10.0 μM) and 1.0568 × 10 −8 M (linear range 1.0–10.0 μM) respectively. The complexation properties of TQ1 toward Pb 2+ and Al 3+ were studied in detail.
研究领域:
分析化学
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环境毒理学
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生物传感
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分子探针
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重金属检测
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Zhisheng Wu,Zhendong Lian,Shanshan Yan,Jielei Li,Jincheng Xu,Shi Chen,Zikang Tang,Shuang-Peng Wang,Kar Wei Ng
Aqueous electrochromic battery (ECB) is a multifunctional technology that shows great potential in various applications including energy-saving buildings and wearable batteries with visible energy levels. However, owing to the mismatch between traditional electrochromic materials and the electrolyte, aqueous ECBs generally exhibit poor cycling stability which bottlenecks their practical commercialization. Herein, we present an ultrastable electrochromic system composed of lithium titanate (Li4Ti5O12, LTO) electrode and Al3+/Zn2+ hybrid electrolyte. The fully compatible system exhibits excellent redox reaction reversibility, thus leading to extremely high cycling stabilities in optical contrast (12 500 cycles with unnoticeable degradation) and energy storage (4000 cycles with 82.6% retention of capacity), superior electrochromic performances including high optical contrast (∼74.73%) and fast responses (4.35 s/7.65 s for bleaching/coloring), as well as excellent discharge areal capacity of 151.94 mAh m–2. The extraordinary cycling stability can be attributed to the robust [TiO6] octahedral frameworks which remain chemically active even upon the gradual substitution of Li+ with Al3+ in LTO over multiple operation cycles. The high-performance electrochromic system demonstrated here not only makes the commercialization of low-cost, high-safety aqueous-based electrochromic devices possible but also provides potential design guidance for LTO-related materials used in aqueous-based energy storage devices.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Ke Jian,Liming Fu,Yujie Zhang,Hongmei Zhang,Xiangjun Guo,Xihui Zhao
Yellow fluorescent carbon dots (Y-CDs) were prepared via microwave method using chitosan and o -phenylenediamine as the main raw materials. The obtained Y-CDs possesses good water solubility, excellent biocompatibility and luminous stability. During the microwave pyrolysis carbonization process, the surface of Y-CDs was modified with the functional groups such as amino and carboxyl, which can bind to Al 3+ by forming complexes, further improving the selectivity and sensitivity of the Al 3+ detection. And the fluorescence of Y-CDs was quenched by Al 3+ by static quenching process. More importantly, Y-CDs as fluorescent sensor was further applied for the determination of Al 3+ in the real water samples with high reliability and accuracy. In addition, Y-CDs present potential application in biological imaging. The cultivated zebrafish embryos with Y-CDs displayed clearly in vivo uptake and metabolic fluorescence images, further confirming its low toxicity and excellent biocompatibility.
研究领域:
材料科学
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分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Yunfei Wang,Hao Sun,Yafei Liu,Lili Zhi,Aimin Chang,Bo Zhang
Perovskite lanthanum chromate (LaCrO 3 ) has been widely investigated for applications as functional material, its properties can be finely tuned through doping. This study explores the effect of Al 3+ doping on the structure and electrical properties of La 0.9 Sr 0.1 Cr 1- x Al x O 3 ceramics. Our findings reveal that Al 3+ doping significantly influences the consistency of grain size and electrical transport properties of these ceramics. As x increases, the grain size decreases and obtains its minimum at x = 0.5. Compared to the undoped La 0.9 Sr 0.1 CrO 3 , Al 3+ doping significantly reduces the resistivity. For x = 0.3, the resistivity obtains its minimum 142.60 Ω cm at −75 °C, while the B -value is reduced to 405 K. These results demonstrate the potential of Al 3+ doping in enhancing the thermal sensing properties of LaCrO 3 ceramics and understanding of semiconductor behavior for electron device applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）