Journal of Materials Chemistry B
·
2019
·Vol. 8
·期 5
·919-927
·
IF 5.047
Minghui Zan,Cong Li,Daoming Zhu,Lang Rao,Qian-Fang Meng,Bei Chen,Wei Xie,Xingwang Qie,Li Li,Xiaojiao Zeng,Yirong Li,Wen-fei Dong,Wei Liu
Copper ions (Cu2+) and L-cysteine (L-Cys) in the human body always play critical roles in various physiological processes, while abnormal Cu2+ and L-Cys concentrations in the biological system lead to many diseases. In this manuscript, Si-doped carbon dots (Si-CDs) with near-infrared fluorescence were designed for the detection of Cu2+ and L-Cys through the fluorescence “on–off–on” mode. The carbon dots exhibited not only excellent optical merits including good stability against photobleaching and high chemical stability, but also superior biological compatibility. Interestingly, due to the abundant amino groups distributed on the surface of Si-CDs, they could bind to copper ions to form cupric amine complexes and then quench the fluorescence of Si-CDs due to an electron transfer process. In addition, upon the addition of L-Cys, the FL intensity of Si-CDs could be effectively recovered accompanied with complexation between Cu2+ and the functional groups in L-Cys, due to which Cu2+ was removed from the surface of Si-CDs. Notably, as far as we know, these are the first red-emitting carbon dots for copper ion and L-Cys assays in water samples and human plasma samples. Furthermore, this strategy was successfully applied to the determination of Cu2+ and L-Cys in living systems, demonstrating great practicability in biomedical applications.
研究领域:
分析化学
·
生物医学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 6
·1664-1674
·
IF 2.153
Qin Siyuan,Tian Yanhong,Zhang Xuejun,Wu Yifan
A class of N-P-Si-containing synergistic flame retardant T-K, the phosphoric triamide (TEDAP, T) modified with epoxy silane coupling agent KH560 (K) on molecular polarity and structure, was successfully synthesized and utilized as sizing agent of carbon fiber (CF) for surface treatment in carbon fiber reinforced epoxy (CF/EP) composites. Time of flight mass spectrometer (TOF-MS) and Fourier transform infrared spectroscopy (FT-IR) results showed the successful synthesis of T-K and different degrees of oligomerization of T. Scanning electron microscope (SEM) and interlaminar shear strength (ILSS) characterized the surface and interface morphology of CF and relevant composites, indicating that the interface performance was preserved under selected T-K structure. Thermogravimetric (TG) and limiting oxygen index (LOI) testing results reflected the delayed decomposition of CF on T −5% from 450 °C to 700 °C, and increased LOI values of composites from 34% to 44%, illustrating the significant enhancement on flame retardancy in composites by the application of T-K.
研究领域:
材料科学
·
化学工程
·
高分子科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Wei Wang,Xiangyu Jin,He Huang,Shuang Hu,Can Wu,Hebing Wang,Yiwu Pan,Changqing Hong,Xinghong Zhang
Ablative thermal protection systems are considered to be one of the most promising means of protection for spacecraft re-entry, but challenges remain. Herein, efficient Ti-Si binary modified carbon fiber reinforced phenolic aerogel nanocomposites (C f /TS-PR) were originally designed based on a multi-stage construction strategy. The C f /TS-PR exhibited desirable mechanical strength , good thermal insulation with a minimum thermal conductivity of 0.0756 W/(m·K), remarkable thermal stability and outstanding ablation resistance, benefiting from the features of TiO 2 and the special structure of TiO 2 -SiO 2 coating. The linear ablation rates are as low as 0.004 and 0.003 mm/s at the heat flow of 1.0 and 1.5 MW/m 2 , respectively. The mass loss rates are as low as 0.006 and 0.009 g/s at the heat flow of 1.0 and 1.5 MW/m 2 , respectively. These results indicate that the C f /TS-PR nanocomposites can be a reliable thermal protection material for the future high-temperature service environment of ultra-high-speed vehicles and neutral rockets.
研究领域:
材料科学
·
航空航天工程
·
热防护系统
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 6
·435
·
IF 21.8
Hong Na,Li Nian,Li Zhao,Zhang Shudong,Ali Sarmad,Song Yanping,Liu Cui,Kang Jun,Wang Shihao,Zhang Jin Zhong,Wang Zhenyang
Silicon-carbon composite anodes hold the promise to resolve the irreversible capacity fading of silicon in lithium-ion batteries but face persistent challenges dominated by unstable, physical interfacial contacts. Herein, a laser-directed covalent bonding strategy is developed to construct atomic-scale Si–N–C bridges between silicon suboxide (SiO x ) nanoparticles and a 3D nitrogen-doped graphene framework. Localized photothermal processing of polyimide-urea-SiO x precursors on carbon-coated copper foil enables in situ integration of chemically anchored SiO x within a conductive graphene network. The architecture achieves dual stabilization: (i) strong Si–N–C covalent bonds suppress interfacial cracking, while (ii) hierarchical porosity accommodates strain via elastic deformation. Critically, direct fabrication eliminates slurry-derived defects, ensuring structural integrity and minimized interfacial impedance. The optimized composite anode delivers 1826.4 mAh g -1 at 0.1 A g -1 and retains 91.3% capacity over 1000 cycles at a high current density of 2.0 A g -1 , demonstrating exceptional stability under high-rate operation. Mechanistically, density functional theory (DFT) reveals that Si–N–C bonding lowers lithium-ion (Li⁺) adsorption energy (–6.549 eV) and redistributes interfacial charge density, synergistically accelerating ion transport. This work provides atomic-scale insights into covalent interface design and establishes a scalable laser-processing strategy of composite anodes for durable high-energy-density batteries. Graphical
研究领域:
材料科学
·
储能
·
纳米技术
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 37
·4851-4861
·
IF 3.1
Rui Yang,Baowen Zhang,Ya Wang,Yi Zheng,Qian Zhang,Xiupei Yang
Substrate materials with high sensitivity and storage stability are crucial for the practical analytical application of surface-enhanced Raman scattering (SERS) techniques. In this work, a SERS-active substrate (Si/Au@Ag/ZIF-67) was fabricated with a metal–organic framework (ZIF-67) on a plasmonic surface (Si/Au@Ag) via self-assembly. The as-prepared material combined the properties of the abundant hotspots of the Au@Ag nanoparticles and the excellent adsorption performance of ZIF-67 for organic molecules. The synergy leads to high sensitivity of the composite substrate with a low detection limit for 4-aminothiophenol (a typical Raman reporter molecule) down to 2.0 × 10−9 M and the analytical enhancement factor (AEF) of the SERS substrate is 3.4 × 106. Moreover, the substrates exhibited good repeatability, high reproducibility, and reliable stability due to the MOF coating. The SERS signal was stable after 60 days of storage at room temperature. Ultimately, the optimal Si/Au@Ag/ZIF-67 was applied as a SERS sensor to analyze thiram, and the results showed a linear concentration range from 10−7 to 10−5 M with good linearity (R2 = 0.9934). The recoveries of thiram in spiked apple juice were in the range of 95.7–102.3%, with relative standard deviations less than 4.3%. These results predict that the proposed SERS substrates may hold great potential for the detection of environmental and food pollution in practical applications.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2019
·
IF 3.47
Zhi Zheng,Jun Wang,Yi Wei,Xuejun Liu,Fengwen Yu,Jianbing Ji
La-Fe modified Si-MCM-41 (La-Fe/Si-MCM-41) catalysts were prepared by the wet impregnation method and used in catalytic cracking of soybean oil (CCS) for biofuel production. The catalysts were characterized by BET, XRD, XPS, Py-FTIR and CO 2 -TPD. The results showed that the aromatics content increased with the increase in B/L value, while the content of oxygenated compounds decreased, indicating that Brönsted acid sites were the major active sites for deoxygenation and aromatization reactions. Compared with Si-MCM-41, the Brönsted acidity of LFM-6 sharply decreased from 22.49 to 5.86 μmol g −1 . Accordingly, the aromatics content was reduced from 37.51 wt.% to 14.52 wt.% which was lower than the limitation (15 wt.%) according to the global environmental legislation. However, for the LFM-6 catalyst, the excessive loss of Brönsted acid sites and sharp decrease in BET surface area and pore volume led to the decrease in deoxygenation. As a result, the fatty acids content increased from 2.71 wt.% to 16.67 wt.% and the acid value reached 35.20 mgKOH g −1 . When the La-Fe loading increased to 15 wt.%, part of fatty acids were converted into ketones by the active sites on Fe 2 O 3 /La 2 O 3 and strong Lewis acid sites on catalysts. Besides, the new weak Lewis acid and basic sites on Fe 2 O 3 /La 2 O 3 exhibited the synergistic effect on promoting the generation of alkenes. The CaO/LFM-6 composite catalysts prepared by the mechanical mixing of LFM-6 and CaO were used in CCS to reduce the acid value of biofuel. LFM-6-C-3 was proved to be an effective catalyst for CCS to produce biofuel with low aromatics (12.31 wt.%) and fatty acids (2.76 wt.%) content.
研究领域:
催化
·
生物燃料
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Ke Sun,Haibin Lin,Rui Zhang,Jinlong Zhu,Liping Wang,Songbai Han,Xiaofei Wang
The emerging laser-driven phosphor-converted white laser diodes (w-LDs) demand highly efficient and thermally stable color converters. To this end, the Ce 3+ luminescence in the rekindled La–Si–O–N host, and the impacts of NH 4 Cl flux and post-processing are investigated systematically. On the basis of the XRD results, well crystalline Ce 3+ -doped La 5 Si 3 O 12 N and LaSiO 2 N are obtained at 1600 °C for 5 h and 1500 °C for 4 h, respectively. Impressively, the representative La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ exhibit a broad excitation band from 240 nm to 400 nm, peaking at around 360 nm, which is well matched with emission from near-UV (n-UV) chip. Under excitation by a n-UV laser, the La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ produce bright blue light in a wide emission band from 360 nm to 550 nm. The CIE chromaticity diagram reveals the tunability of the hue of these phosphors. The quenching temperature is determined to be 396 K and 429 K for La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ respectively, indicating superior thermal stability. The addition of 3 wt% NH 4 Cl flux much enhances the emission intensity of both La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ . Furthermore, the post-treatments markedly improve the luminescence properties by increasing the crystallinity , reducing the surface defect , and changing the morphology. Therefore, it is believed that the present work has promising applications in LD lighting and promoting the development of laser display.
研究领域:
材料科学
·
光学
·
光子学
·
激光技术
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 11
·6577-6585
·
IF 3.9
Yuting Zhang,Huan Tu,Guoying Zhao,Jingshan Hou,Yufeng Liu,Xin Qiao,Zhongzhi Wang,Bo Li,Ji-Guang Li,Feng Wang,Yongzheng Fang
Compared with other fluorescent crystal phases, garnet has better structural stability in a glass matrix and renders precisely controllable emissions due to the abundant lattice control positions. In this work, we regulate the coordination field of Ce 3+ ion based on the co-substitution method and achieve the spectra regulation in the yellow–green range. We used Ba 2+ –Si 4+ cations to replace Y 3+ –Al 3+ cations in Y 3 Al 5 O 12 (YAG) matrix to obtain blue-shift of the emission peak from 552 to 539 nm. The centroid shift and crystal field splitting decrease with the decreasing covalency of the bond between the Ce 3+ ion and the surrounding anions owing to the higher electronegativity of Si 4+ ions than Al 3+ ions. The corresponding fluorescent films were prepared by a low-temperature co-sintering process based on the as-made Ba 2+ –Si 4+ co-substituted phosphor. X-ray powder diffractometer and scanning electron microscopy images showed that the fluorescence crystals were less eroded and evenly dispersed in the glass matrix. Spectral analysis showed that the garnet phase was protected by using lead-free borosilicate glass with a low melting point, and the quantum efficiency of phosphor-in-glass (PiG) retains 98% of the corresponding phosphor. By adjusting the ratio of garnet phosphor to commercial red nitride phosphors, a warm white fluorescence with a color rendering index of 80.3 and color temperature of 3899 K was obtained. The prepared warm white film has potential application value in the whole spectra field.
研究领域:
材料科学
·
光电子学
·
固态照明
·
无机化学
·
晶体场理论
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 10
·2982-2994
·
IF 7.683
Weijian Duan,Jinglei He,Ziliang Wei,Zongren Dai,Chunhua Feng
The heteroatom-doped, carbon-activated peroxymonosulfate (PMS) system proceeding via the non-radical oxidation pathway involving singlet oxygen (1O2) represents a promising advanced oxidation process (AOP) due to the resistance of 1O2 to background anions in solution. However, the performance level of pollutant removal is not yet satisfied, and the mechanism of 1O2 generation remains elusive. Herein, we report the development for the first time of a unique Si-engaged heteroatom (i.e., N)-doped carbon (Si/N–C) nanomaterial for PMS activation, which exhibits outstanding performance in the removal of various kinds of pollutants and an appreciably wide working pH range of 2.5 to 11. Taking rhodamine B (RhB) as an example, the Si/N–C@PMS system achieved a much higher reaction rate (0.64 min−1) than the Si–C (0.047 min−1), N–C (0.017 min−1), SiO2 (0.021 min−1), and Co3O4 (0.026 min−1; a standard catalyst) systems. In addition, the results of electron spin resonance (ESR) and scavenging experiments solidly support the conclusion that the mechanism of 1O2 generation in this system is via the recombination of superoxide radicals O2˙−, a pathway seldom reported for metal-free, catalyst-activated PMS systems. More importantly, we observed apparent inhibition effects of the anions (e.g., HCO3−, HPO42−, and PO43−) on the degradation performance, inconsistent with many previous reports suggesting that the 1O2-mediated oxidative system possesses a high selectivity toward pollutant degradation in the presence of these anions. Further studies with the anions, including Cl−, HCO3−, and HxPO4(3−x) (x = 0, 1, 2), suggest that the reaction between O2˙− and these anions is the main reason for the abnormal salt effect. This work will deepen the understanding of 1O2 formation via the intermediate of O2˙− and provide a new insight into its salt resistance capacity.
研究领域:
环境化学
·
材料科学
·
催化
·
水处理
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2013
·
IF 1.687
Yan-Jing Gu,Bing Yan
The synthesis of organics 9-hydroxyphenalenone (HPO), 2-methyl-9-hydroxyphenalenone (MHPO), 6-hydroxybenz[de]anthracen-7-one (HBAO), 5-amino-1,10-phenanthroline (phen-NH 2 ) and its functionalized mesoporous MCM-41 by covalent band are reported, as well as those of Europium (III) hybrid mesoporous materials, EuL 3 phen-MCM-41 (L = HPO, MHPO, HBAO). The photoluminescence and microstructural properties are characterized, and the XRD and BET results revealed that all of these hybrid materials have uniformity in the mesostructure. It is worth noting that the excitation spectra of these hybrid materials have a broad absorption, which occupies from UV to visible region (250–475 nm). Upon ligand-mediated excitation with the visible light, the low efficient energy transfer exhibit between the organic ligands and europium(III) ion under visible excitation, but the maximum wavelength (456 nm/457 nm/451 nm) located at blue light region, which is in consistent with the blue LED light, then might be a feasible alternative in producing time-resolved luminescence under LED-excitation.
研究领域:
材料科学
·
化学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 45
·29585-29594
·
IF 4.036
Jia-Yu Zeng,Yu-Qi Liang,Yan-Ni Wu,Xiao-Yi Wu,Jia-Ping Lai,Hui Sun
A ratiometric fluorescent probe with blue-emission fluorescence based on N, Si-doped carbon dots (N, Si-CDs) for the detection of balofloxacin (BLFX) was synthesized by simple one-pot hydrothermal carbonization using methotrexate and 3-aminopropyltriethoxysilane (APTES) as carbon materials. The obtained N, Si-CDs showed dual-emission band fluorescence characterization at 374 nm and 466 nm. Furthermore, the synthesized N, Si-CD probe exhibited evidence of ratiometric fluorescence emission characteristics (F466/F374) toward BLFX along with a decrease in fluorescence intensity at 374 nm and an increase in fluorescence intensity at 466 nm. Based on this probe, a highly sensitive and fast detection method for the analysis of BLFX has been established with a linear range of 1–60 μM and a low detection limit of 0.1874 μM, as well as a rapid response time of 5.0 s. The developed assay has also been successfully applied for the detection of BLFX in tablets and rat serum.
研究领域:
分析化学
·
材料科学
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2019
·
IF 1.584
Yinhong Liu,Yuhan Wei,Yongshuang Bian,Shengjiao He,Xin Wang,Xin Liu,Chenglei Li,Qi Wu,Xianyin Zeng,Hanguang Wang,Kuan Liu
Design and synthesis of highly selective fluorine ion probes become particularly important owing to the specific role of fluorine ion in chemical and biomedical progresses. As a new-type of fluorescent material, conjugated polymers with unique photometric properties have been widely researched by scientists in the field of the fluorescence sensors. In this study, the polymer PBTPV-OSi containing benzothiazole moiety is synthesized via palladium-catalyzed Heck coupling reaction. This polymer not only exhibits good solubility in organic solvents but also shows high selectivity for fluorine ion detection in comparison to other anions. Upon addition of F− to PBTPV-OSi solution, Si–O cleavage of PBTPV-OSi leads to the fluorescence quenching of the polymer in tetrahydrofuran dramatically, and the detection limit is 8 × 10−6 mol/L. Moreover, besides detecting fluorine ion from organic phase, the probe can also effectively detect potassium fluoride from inorganic phase. More importantly, a naked-eye detectable chromogenic and fluorogenic dual response to fluorine ion (F−) can be visibly noted and the detection process of fluorine ion is relatively fast.
研究领域:
材料科学
·
分析化学
·
荧光传感
·
聚合物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）