CARBON
·
2018
·
IF 7.082
Huiyu Li,Yuan Xu,Li Zhao,Jie Ding,Mengyang Chen,Guangrui Chen,Yi Li,Lan Ding
The solid-phase pyrolysis method is widely used in the synthesis of fluorescent carbon dots (CDs) because of its large scale and solvent-saving advantages. However, CDs are inclined to agglomerate during the synthesis process, resulting in low quantum yield (QY) and inhomogeneous distribution of particle sizes. Here, a simple and effective solid dispersion surface pyrolysis method was used for the synthesis of tiny-carbon dots (T-CDs) with a high QY. Multi-walled carbon nanotubes (MWCNTs) were used as a support and 2-( N -morpholino)ethanesulfonic acid (MES) as a precursor. MES was uniformly dispersed on the surface of MWCNTs by hydrogen bonding and π-π interactions. Due to the excellent thermal conductivity and rigidity of MWCNTs, the precursor is carbonized without agglomeration. Compared with the CDs obtained by the direct pyrolysis method without the use of a solid support, the particle size of the T-CDs is small (0.69 ± 0.14 nm) and the QY increased from 17.8 to 42.8%. It is anticipated that this method will lead to the improvement of the QY of CDs. Applications of the T-CDs included fluorescence detection of rutin in pharmaceuticals, human urine, and human serum samples, and determination of Al 3+ in tap water samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yumin Hao,Wenjuan Dong,Yang Liu,Xiaole Wen,Shaomin Shuang,Qin Hu,Chuan Dong,Xiaojuan Gong
Ratiometric fluorescence sensor has high selectivity and good sensitivity; however, its development is limited by intricate design, tedious synthesis, etc. Herein, a facile and effective ratiometric fluorescence sensing platform for fluoride ion (F - ) detection was developed by simply combining nitrogen-doped carbon dots (N-CDs) and morin-Al 3+ based on inner filter effect (IFE). The competitive binding of F - to Al 3+ obviously decreased morin-Al 3+ fluorescence and increased N-CDs fluorescence, attributing to the inhibition of IFE between N-CDs and morin-Al 3+ . The as-constructed ratiometric fluorescence sensing platform can be used for F - detection with a wide linear range (0.5–150 μM) and a low detection limit (55.8 nM). Interestingly, with the introduction of F - into the N-CDs/morin-Al 3+ sensing platform, a distinguishable change in fluorescence color from green to blue enabled the N-CDs/morin-Al 3+ system to be used as a smartphone-assisted visual sensing platform for F - detection with a detection limit of 2.09 μM. This platform was successfully applied for the onsite monitoring of F - in various water samples with satisfying results. These findings provide a novel guidance for the facile construction of a ratiometric optical dual-mode and smartphone-assisted sensing platform based on CDs, revealing the broad application prospect of CDs in environmental monitoring field.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL NEUROANATOMY
·
2024
·
IF 2.7
Linli Guo,Yanan Zhao,Zhengqiao Kong,Ruihua Liu,Ping Liu
Alzheimer's disease (AD) is a degenerative neurological disorder with unclear pathogenesis. Single-target drugs have very limited efficacy in treating AD, but synthetic multi-target drugs have poor efficacy and safety. Therefore, finding suitable natural multi-target drugs against AD is of great interest for research studies. We chose two flavonols, myricetin and morin, for the relevant study. In this study, we used microinjection of Aβ 1-42 oligomers into the CA1 region of rat hippocampus, combined with gavage of Aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) solution to establish AD rat models, and myricetin and morin were selected as intervening drugs to explore the protective effects against neurological impairment. Experimental results showed that myricetin or morin could reduce the production of Aβ, Tubulin-associated unit (Tau), and Phosphorylated tubulin-associated unit (p-Tau), down-regulate the expression of relevant inflammatory factors, reduce hippocampal cell apoptosis in rats. There was a significant increase in the activity of adenosine triphosphatase, catalase, total superoxide dismutase, and the content of glutathione in the brain tissue. However, the content of malondialdehyde, inducible nitric oxide synthase, and the activity of acetylcholinesterase were decreased in the brain tissue. These two flavonols can regulate the imbalance of monoamine and amino acid neurotransmitter levels. In conclusion, Myricetin or morin can effectively improve learning and memory dysfunction in AD rats induced by Aβ 1-42 /Al 3+ through anti-oxidative stress and anti-apoptotic features.
研究领域:
神经科学
·
药理学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TETRAHEDRON
·
2024
·
IF 2.1
Shaochen Sun,Tianyu Li,Yan Zhu,Farong Tao,Liping Wang,Shuangshuang Wang,Xueguo Zhang,Tonghui Zhang,Guang Li
A novel water-soluble polymer P1 functionalized with pyrazine Schiff-base derivative was successfully synthesized. As an efficient “turn-on” fluorescent chemosensor , P1 showed high selectivity and anti-interference ability for the detection of Al 3+ ions in pure aqueous solutions. The detection limit of P1 for Al 3+ ions was as low as 3.68 × 10 −8 M. P1 displayed good detectability for Al 3+ ions over a wide pH range of 5–10. The detection of Al 3+ ions by P1 has been proven to have excellent reversibility by alternately adding Al 3+ ions and EDTA to P1 aqueous solution. Furthermore, P1 could be applied to quantitative determination of Al 3+ ions in real water samples. P1-based test strips were also facilely prepared for convenient on-site qualitative detection of Al 3+ ions in realistic aqueous samples.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Huajian Song,Bingli Jiang,Chanming Mei,Huili Wei,Shumin Jiang,Liping Liu,Chenjie Jiang,Linmin Zou,Yongyang Gong
Nonconventional luminescent polymer materials (NLMs) hold great promise for advancing bioimaging due to their unique optical properties and biocompatibility. However, their practical applications are hindered by limitations such as nonemissive behavior in dilute solutions and difficulties in organelle-specific imaging. The cooperative effects of hydrogen bonding and n → π* interactions between amide groups could facilitate molecular clustering, thereby increasing the emission efficiency of NLMs in dilute solutions. To confirm this method, two water-soluble NLMs, P1 and P2, based on aspartic acid, were synthesized. These polymers exhibit remarkable photoluminescence quantum yields (5.42% and 3.11%) at a low concentration of 0.1 mg/mL, accompanied by concentration- and excitation wavelength-dependent emsission, and aggregation-induced emission (AIE) properties. Furthermore, both polymers demonstrate temperature-sensitive emission, excellent photostability, and low cytotoxicity, making them ideal candidates for various bioapplications. Importantly, P1 exhibits selective recognition of Al3+ ions with a low detection limit of 0.92 μM, significantly below the World Health Organization guideline of 7.4 μM. Additionally, both P1 and P2 demonstrate lysosomal targeting ability, suggesting their potential for diverse applications in cellular imaging and ion sensing.
研究领域:
生物成像
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材料科学
·
分析化学
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xue Hu,Xuanxiang Mao,Xiaodan Zhang,Yuming Huang
One-step approach was developed for the fast synthesis of copper nanoclusters (CuNCs), which were used as a fluorescent probe for the sensitive detection of Al 3+ in food samples. For this, aqueous CuSO 4 was reduced into CuNCs by dithiothreitol (DTT) at room temperature within 30 min. The synthetic process was fast, simple and easy. The DTT-capped CuNCs (DTT-CuNCs) were characterized by UV–vis absorption, fluorescence, FT-IR, TEM and XPS. The DTT-CuNCs display orange fluorescence with a maximum emission at 590 nm while excitation at 360 nm. The aggregation-induced fluorescence enhancement property of DTT-CuNCs in presence of Al 3+ was found. On this basis, we developed a simple, sensitive, selective turn-on fluorescent sensor for the detection of Al 3+ in food samples. Under the optimized conditions, the enhanced fluorescence intensity exhibited a good linear relationship with Al 3+ concentrations in the range from 0.01 μM to 7 μM with a detection limit of 0.01 μM. The DTT-CuNCs-based fluorescent probe has been successfully used to assay the content of aluminum in real food samples such as the fried food and pasta. These results demonstrate the great potential of the DTT-CuNCs-based fluorescence sensor for the routine estimation of Al 3+ content in food samples.
研究领域:
纳米技术
·
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 19
·9182-9192
·
IF 4.197
Cholho Choe,Ling Yang,Zhanao Lv,Wanling Mo,Zhuqi Chen,Guangxin Li,Guochuan Yin
Redox-inactive metal ions can modulate the reactivity of redox-active metal ions in a variety of biological and chemical oxidations. Many synthetic models have been developed to help address the elusive roles of these redox-inactive metal ions. Using a non-heme manganese(II) complex as the model, the influence of redox-inactive metal ions as a Lewis acid on its catalytic efficiency in oxygen atom transfer was investigated. In the absence of redox-inactive metal ions, the manganese(II) catalyst is very sluggish, for example, in cyclooctene epoxidation, providing only 9.9% conversion with 4.1% yield of epoxide. However, addition of 2 equiv. of Al3+ to the manganese(II) catalyst sharply improves the epoxidation, providing up to 97.8% conversion with 91.4% yield of epoxide. EPR studies of the manganese(II) catalyst in the presence of an oxidant reveal a 16-line hyperfine structure centered at g = 2.0, clearly indicating the formation of a mixed valent di-μ-oxo-bridged diamond core, MnIII-(μ-O)2-MnIV. The presence of a Lewis acid like Al3+ causes the dissociation of this diamond MnIII-(μ-O)2-MnIV core to form monomeric manganese(IV) species which is responsible for improved epoxidation efficiency. This promotional effect has also been observed in other manganese complexes bearing various non-heme ligands. The findings presented here have provided a promising strategy to explore the catalytic reactivity of some di-μ-oxo-bridged complexes by adding non-redox metal ions to in situ dissociate those dimeric cores and may also provide clues to understand the mechanism of methane monooxygenase which has a similar diiron diamond core as the intermediate.
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22375-22384
·
IF 2.22
Wang Li,He Lin,Li Ji,Yu Yongsheng,Li Haibo
M-type strontium ferrite is a kind of magnetic functional material with wide application prospect. In this work, SrFe 12− x Al x O 19 (0 ≤ x ≤ 1) and Sr 1− y Ca y Fe 8 Al 4 O 19 (0 ≤ y ≤ 0.4) have been prepared by a hydrothermal method, and the effects of Al 3+ doping and Al 3+ and Ca 2+ co-doping on the magnetic properties have been investigated. X-ray diffraction analysis indicates all the samples are a hexagonal structure, and the shift of the diffraction peaks suggests that Al 3+ and Ca 2+ are successfully doped in SrFe 12 O 19 . Field emission scanning electron microscope images show the particles have the hexagonal shape with the size of 1.1–2.9 µm. Vibrating sample magnetometer reveals that the doping of Al 3+ and the co-doping Al 3+ and Ca 2+ can enhance magnetic properties of strontium ferrite. For example, the values of coercivity and the saturation magnetization of SrFe 8 Al 4 O 19 are 914.1 Oe and 44.0 emu/g, which are 3% and 117% enhancement compared with SrFe 12 O 19 , respectively. For Sr 1− y Ca y Fe 8 Al 4 O 19 , coercivity and saturation magnetization increase from 914.1 Oe and 41.8 emu/g to 1047.2 Oe and 50.2 emu/g when the Ca 2+ doping concentration increases from 0 to 0.4. Moreover, the effects of acid washing also on phase composition, morphology and magnetism are researched. The as-synthesized doping strontium ferrite will be useful for the applications in security switching and recording media.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2014
·
IF 3.94
D. Xu,W.L. Li,L.D. Wang,W. Wang,W.P. Cao,W.D. Fei
The high piezoelectric properties of piezoelectric ceramics are typically obtained by inducing a phase transition between two ferroelectric phases, using either the morphotropic phase boundary (MPB) or the polymorphic phase transition (PPT). Here we demonstrate that neither the MPB nor the PPT is necessary to achieve high piezoelectric properties. Our results show that the optimized distribution of Li + –Al 3+ pairs parallel to the [0 0 1] direction, as found in our x LiAlSiO 4 /BaTiO 3 ( x LAS/BT) lead-free piezoelectric ceramic system prepared from ordinary raw materials by conventional solid-state reaction sintering , can generate a large piezoelectric constant ( d 33 ) of 378 pC/N when x = 7.5 mol.%. The d 33 value of the 7.5 mol.% LAS/BT ceramic is more than three times that of the pure BT ceramic. The distortion connected to the proposed Li + –Al 3+ pairs locally creates unit cells of less than tetragonal symmetry, and these low-symmetry cells can be responsible for the high piezoelectric response. The high-temperature stability testing reveals that these doped ceramics are usable at temperatures as high as 120 °C. This piezoelectric mechanism coming from the doping ionic pairs provides a new method to achieve large piezoelectric properties in a wide range of ABO 3 -type perovskite systems.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jie Li,Zhongteng Wang,Juan Yang,Xinming Xia,Ruobing Yi,Jie Jiang,Wei Liu,Junlang Chen,Liang Chen,Jing Xu
Fluorescence switch based on graphene quantum dots (GQDs) is of great interest in the areas of environment, medicine and data security because of their promising applications. However, the known ternary “on-off-on” fluorescent switches of GQDs are very few due to the limited effective fluorescence recovery strategies. In this work, we proposed a new cationic control strategy and designed a novel “on-off-on” fluorescence switch, i.e., GQDs-Cu 2+ /Fe 3+ /Cr 3+ -Al 3+ /Ga 3+ /In 3+ , where the fluorescence of synthesized GQDs was quenched by Fe 3+ , Cu 2+ and Cr 3+ , and subsequently was recovered by three kinds of Group IIIA ions Al 3+ , Ga 3+ and In 3+ . The corresponding recovery degree can reach up to 0.81 compared with the pristine GQDs. The XPS results combining with quantum chemical calculations illustrated that the change of π-conjugated region caused by cations dominated the quenching and recovery of fluorescence. Furthermore, based on this “on-off-on” mechanism, a kind of anti-counterfeiting stealth ink for information encryption was also suggested. This work is the first report that Group IIIA ions Al 3+ , Ga 3+ and In 3+ can be used for fluorescence recovery, and the cationic control strategy proposed here provides a new and promising strategy for the development of “on-off-on” fluorescent switch in future studies.
研究领域:
环境科学
·
医学
·
材料科学
✓ 已验证
DOI
高影响因子
International Journal of Coal Preparation and Utilization
·
2024
·
IF 2
Xiangyun Sun,Qifa Lu,Jiakun Tan,Long Liang,Haiyang Gao,Guangyuan Xie,Yaoli Peng
This study investigates the flotation performance of coal gasification fine slag in the presence of metal ions with different valences. The impact of metal ions on the surface topography, wettability, zeta potential, functional group, and particle size distribution of coal gasification fine slag were analyzed. The results demonstrated that K+, Ca2+, Mg2+, and Al3+ all have a positive effect on flotation, with Al3+ being particularly effective. At a concentration of 0.2 mol/L, Al3+ increased the recovery of combustible matter in coal gasification fine slag from 66.70% to 91.05% compared to deionized water. Metal ions reduce the absolute value of the gasification fine slag potential, compress its double layer while increasing its surface hydrophobicity. Higher ion concentration leads to a closer-to-zero potential and increased hydrophobicity. Additionally, Al3+ promote diesel adsorption onto coal gasification fine slag. This work explains the effects of metal ions on coal gasification fine slag flotation.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Jing Yang,Yun Zhang,Xiaoning Li,Xinghua Zhu,Shihua Ding,Wenjie Zhou,Tianxiu Song
BaSi 2- x Al x O 5- x /2 ( x = 0-0.05) low-dielectric ceramics were prepared by the solid-phase method. The effects of heterovalent ion substitution on the crystal structure and microwave dielectric properties were studied. X-ray (XRD) diffraction revealed that they formed single-phase solid solution with orthorhombic structure. Appropriate amount of Al 3+ doping decreased the sintering temperature from 1225 °C to 1150 °C. The change in dielectric constant ( ε r ) resulted from the combined effects of the ionic nature of chemical bonds ( f i ave ) (internal factor) and the relative density (external factor). Si-O bonds contributed more significantly to the ceramic dielectric polarization. The increase in packing density and lattice energy ( U Total ) enhanced the quality factor ( Q×f ), which nearly tripled compared with the undoped case. The resonant frequency temperature coefficient ( τ ƒ ) was dominated by oxygen bond valence ( V o ). When sintered at 1150 °C for 4 h, BaSi 1.98 Al 0.02 O 4.99 exhibited optimal performance: ε r = 7.56, Q×f = 41,878 GHz, τ f = -17.65 ppm/°C. This study offered a new approach to modifying BaSi 2 O 5 ceramics.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）