JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2021
·Vol. 32
·期 1
·158-169
·
IF 1.838
Zhou Yousheng,Mei Xingyu,Cai Zhe,Wang Qing,Duanmu Jiahui,Kai Ouyang,Zhang Haijiang,Tang Xiujuan,Han Xiaoxiang
A series of metal ion (M = Sn2+, Fe3+, Ni2+, Co2+, Ag+, Cu2+) exchanged tungstophosphoric acid (H3PW12O40; TPA) catalysts with tunable Brønsted/Lewis acidity were synthesized and exploited for the oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) using hydrogen peroxide (H2O2) as oxidant. The structure of these M-TPA composite salts was also characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analyses (TGA) and solid-state 31P nuclear magnetic resonance (NMR) probe molecule method. Among these M-TPAs, the Sn1/2H2PW12O40 catalyst, which presented strong Brønsted acidity, the synergistic effect of Brønsted/Lewis and pseudo-liquid characteristic property, exhibited excellent catalytic activity and durability with 98.2% of BzH selectivity and 95.1% of BzH yield. The optimal conditions for the oxidation of BzOH optimized by response surface methodology (RSM) were as follows: n(BzOH)/n(H2O2) = 1:1.25, catalyst amount of 5.5 wt.% to BzOH, water amount of 17 mL, 3.3 h of reaction time, and temperature 393 K. Moreover, further kinetic study confirmed that the reaction order was 2.64 and the activation energy was 21.75 kJ mol-1.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2016
·Vol. 8
·期 8
·1617-1627
·
IF 1.812
Wen Zhen,Su Jun-Qing,Chen Qing,Chen Li-Di
To improve the physicochemical and pharmacokinetic properties, solid lipid nanoparticles (SLNs) modified with (Polyethylene glycol-2000)-1,2-distearoyl-sn-glycero-3-phosphoethanolamine (PEG2000-DSPE) were prepared using glyceryl monostearate as a lipid carrier and resveratrol as a model
drug. Compared to ordinary SLNs, SLNs doped with low amount of PEG2000-DSPE [m(PEG2000-DSPE):m(lipids) = 1:5, w/w] exhibited improved physicochemical and pharmacokinetic properties, including higher entrapment efficiency (above 80%), smaller particle size (approximately 100 nm), more
distinguished drug release at low pH values (pH < 6.0), and longer drug circulation in vivo. According to the characterizations performed, the DSPE moiety was doped into lipid matrix to form a PEG2000-DSPE/lipid eutectic dopant, inhibiting lipid polymorphism transformation
from α-form to β-form, thereby preventing drug expulsion from the lipid. The dopant contained lattice defects, allowing for the incorporation of more resveratrol. Resveratrol was released in a sustained and pH-sensitive pattern due to nanoparticles destabilization
induced by partial protonation of PEG2000-DSPE. PEG chains distributed on the nanoparticle surface caused steric hindrance and “stealth” properties, thus maintaining dispersion stability and extending circulation time of nanoparticles. These results confirm that PEG2000-DSPE modification
effects are attributable to the matrix and surface structures of nanoparticles, which consist of a core containing DSPEinduced lattice defects and a shell coated with PEG chains.
研究领域:
药剂学
·
生物材料学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Chuanya Li,Qianfeng Zhou,Changhu Leng,Yongchao Wang,Chenyang Ma,Junlei Zhang,Zhijun Li
Polyolefin plastics, though highly resistant to degradation due to their thermodynamic stability and chemical inertness, can be catalytically depolymerized into liquid fuels, offering a promising route to mitigate white pollution and fossil fuel dependency. Here, a sustainable catalytic route for closed-loop polyolefin upcycling is achieved using a bifunctional Sn1W9/γ-Al2O3 catalyst that integrates redox and acidic functionalities within a self-regenerative hydrogen relay cycle. The optimized interface between Sn and W species promotes simultaneous C-H dehydrogenation and C-C metathesis via dynamic Sn-H ↔ W-OH coupling, enabling quantitative conversion of polypropylene at 250 o C within 1 hour and selective production of C5-C22 liquid hydrocarbons (95.0%). Structural, spectroscopic, and kinetic analyses identify hydroxylated W 5+ -OH sites as the principal active centers, stabilized by Sn-mediated hydrogen spillover. The catalyst achieves exceptional stability and reusability across multiple degradation cycles and diverse commercial plastics. Life cycle and techno-economic assessments reveal 16-fold enhanced thermal efficiency, > 85% solvent recyclability, and a carbon footprint of 7.3 kg CO2 e•kg⁻¹surpassing benchmark catalysts in both sustainability and energy utilization. This self-sustaining redox-hydroxyl loop establishes a scalable, low-carbon paradigm for circular plastic valorization. Under mild conditions, the system delivers excellent degradation performance and stability, demonstrating scalability for kilogram-scale recovery.
研究领域:
催化化学
·
可持续化学
·
高分子科学
·
化学工程
·
环境科学
·
能源与燃料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 26
·21101-21110
·
IF 2.779
Wang Zhaohui,Fang Weishuang,Tang Ying,Xiang Huaicheng,Li Jie,Fang Liang
Ca 3 MZnGe 3 O 12 ( M = Zr, Sn) ceramics crystallized in a cubic garnet structure (A 3 B 2 C 3 O 12 ) with a space group of Ia- 3 d , and promising microwave dielectric properties with low coefficients of thermal expansion ( α L ) were obtained, namely, ε r = 10.5 and 9.3, Q × f = 79,700, and 96,040 GHz, τ f = − 36.1 and − 61.5 ppm/°C, and α L = 4.3 and 4.7 ppm/°C for Ca 3 ZrZnGe 3 O 12 and Ca 3 SnZnGe 3 O 12 , respectively. Bond valence calculation reveals that Ca 3 SnZnGe 3 O 12 exhibits a slight “compressed” effect at A-site and B-site with a slightly negative deviation (Δ ε r ~ − 1.01%) of the porosity corrected ε r (corr) from theoretical ε r (C–M) calculated by the C–M equation, while Ca 3 ZrZnGe 3 O 12 shows a “rattling” effect at the A-site and C-site with a large positive Δ ε r ~ 15.8%, leading to a high ε r , a more close to zero τ f and a lower Q × f value as compared to those of Ca 3 SnZnGe 3 O 12 . The relationship between structure and their intrinsic microwave dielectric properties was investigated by complex chemical bond theory and far-infrared reflectivity spectra.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Weili Ye,Lihan Deng,Jin Li,Chu Chen
Accurate detection of ammonia (NH 3 ) is a key indicator for evaluating the deterioration of high-protein foods and is of great significance for food safety. In this study, we modified Sn-ZnO using a Co-based metal–organic framework (MOF) material (ZIF-67) to prepare cauliflower-shaped Sn-ZnO/ZIF-67 (SZZ67) for NH 3 sensors at room temperature (25 °C). By regulating Co 2+ , it was found that the sensor's response to NH 3 decreased with the increase in Co 2+ content, while the desorption ability was significantly enhanced. When the mass ratio of Sn-ZnO to the added C 4 H 6 CoO 4 ∙4H 2 O was 1:1, its response was 13.46 times that of Sn-ZnO, the response/recovery time was 63.78/7.99 s, and good moisture resistance was observed. Density functional theory (DFT) confirmed that SZZ67 can adsorb more NH 3 and release more conductive electrons, thereby increasing its response value. The sensors prepared using SZZ67 could more effectively monitor NH 3 , which is applicable for monitoring the freshness of soy products.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 64
·39026-39032
·
IF 3.119
Ying Zhao,Dongyue Su,Wentao Dong,Xiaoyang Xu,Xiangjing Zhang,Yongqi Hu
The investigation of highly efficient catalysts for the electrochemical reduction of carbon dioxide (ER-CO2) is the most critical challenge to commercialize conversion and utilization of CO2. Herein we propose a new and very promising catalyst, high crystallinity Sn crystals on Ni foam (Sn@f-Ni), for the electroreduction reaction of CO2 in potassium bicarbonate aqueous solution. The catalyst is fabricated in situ on a pretreated Ni foam substrate through a galvanostatic electrodeposition strategy. SEM and XRD demonstrate that high crystallinity Sn crystals, with an average size of 2–3 μm, evenly dispersed on the Ni foam support can be reproducibly obtained. Electrochemical measurements demonstrate that the Sn@f-Ni electrode at the deposition current of 15 mA exhibits superior performance in promoting the ER-CO2. Tafel measurements show that except for electrodes with a deposition current of 5 mA, the Tafel slopes of the other four electrodes are all above 100 mV dec−1, which is consistent with a rate-determining initial electron transfer to CO2 to form a surface adsorbed intermediate, a mechanism that is commonly invoked for metal electrodes. A stable composition of syngas can be obtained by electrolysis at −1.7 V potential (vs. Ag/AgCl), indicating that the Sn surface with high crystallinity conforms to the Heyrovsky–Volmer mechanism at a potential of −1.7 V. The ratio of CO and H2 generation was about 1 : 2, meaning it could be used as syngas for preparing some valuable fuels. This work provided an efficient method to convert the surplus CO2 to valuable syngas.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 7
·4727-4740
·
IF 3.553
Deng Shuping,Jiang Xianyan,Chen Lili,Zhang Ziye,Qi Ning,Wu Yichu,Chen Zhiquan,Tang Xinfeng
In this paper, we reported the enhanced thermoelectric properties of Cd and Sn dual-doped Cu 3 SbSe 4 -based material prepared by the vacuum melting combined with spark plasma sintering process. X-ray photoelectron spectroscopy studies revealed the presence of Cu + , Cd 2+ , Sb 5+ , Sn 4+ and Se 2− states of Cu, Cd, Sb, Sn and Se, respectively. All samples exhibited p -type conduction with carrier concentrations varying from 0.54 × 10 18 to 46.42 × 10 18 cm −3 , while carrier mobility changes from 18.2 to 46.6 cm 2 V −1 s −1 at room temperature. Cd doping at Cu sites in the Cu 3 SbSe 4 can reduce the lattice thermal conductivity, while Sn doping at Sb sites is effective to adjust the carrier concentration. The further reduction in thermal conductivity is observed in Cd-Sn co-doped samples resulting from an accumulated effect combining point defects and the secondary-phase CdSe. Consequently, the maximum dimensionless figure of merit ( ZT ) value reaches 0.66 at 623 K for the Cu 2.75 Cd 0.25 Sb 0.94 Sn 0.06 Se 4 sample, which is 190% larger than that of the intrinsic sample ( ZT of 0.35). The findings provide an alternative strategy of boosting the carrier and phonon transports of the Cu 3 SbSe 4 , which is also a meaningful guidance to achieve high performance in other copper-based chalcogenides.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
热电转换
·
半导体物理
✓ 已验证
DOI
高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 1
·016402
·
IF 1.321
Xue Min,Jiangjian Shi,Linbao Guo,Qing Yu,Pengpeng Zhang,Qingwen Tian,Dongmei Li,Yanhong Luo,Huijue Wu,Qingbo Meng,Sixin Wu
The Zn/Sn ratio in Cu2ZnSn(S, Se)4 (CZTSSe) films has been regulated to control the composition-related phase, defect, and photoelectric properties for high performance kesterite solar cells. It is found that the increase in the Zn/Sn ratio can slightly narrow the energy band gap to extend the light absorption range and improve the photocurrent. Optimal Zn/Sn ratio of 1.39 in CZTSSe film is obtained with the least secondary phase, the lowest defect density, and the longest charge recombination lifetime. Up to 10.1% photoelectric conversion efficiency has been achieved by this composition regulation.
研究领域:
光伏技术
·
材料科学
·
半导体材料
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yukun Liu,Zekun Wang,Yuanyuan Zhang,Chenguang Yang,Tonglu Sun,Cian Xie,Hao Ding,Lefu Mei,Yangai Liu,Yue Wang
The commercialization of cesium lead halide perovskite quantum dots (QDs) is hindered by lead toxicity and poor stability. We propose a synergistic “chemical-physical” dual-confinement strategy. Chemically, Sn 2 + and Cu 2+ are co-doped into CsPbBr 3 , forming low-lead CsSn 0.7 Cu 0.1 Pb 0.2 Br 3 QDs, where Sn 2+ tunes the bandgap and Cu 2+ passivates Sn-related defects. Physically, QDs are in-situ grown within halloysite nanotubes (HNTs), a natural clay, serving as a nanoreactor and barrier. Silane modification enhances hydrophobicity. The composite exhibits high photoluminescence quantum yield (73.46%), excellent thermal reversibility, and remarkable water resistance (86% intensity retention after 12 h). Applications include a wide-color-gamut white light-emitting diode (122.1% of National Television System Committee (NTSC)) and an efficient visible-light photocatalyst for methylene blue degradation. This work provides a sustainable pathway for stable, low-toxicity perovskite materials in optoelectronics and environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2026
·
IF 3.4
Zhang Yu,Zhou Ping,Liu Xiaomei,Liu Yi,Huang Jing,Wu Shuangjie,Saitoh Hidetoshi,Zhang Botao,Li Hua
Electrochemical chlorine evolution is a promising approach for antimicrobial and wastewater treatment. However, the large-scale applications of conventional electrodes are hindered by the high cost of precious metals and tedious thermal decomposition method. In this study, precious metal-free electrodes for chlorine evolution were fabricated via liquid plasma spraying technique using a Ti 0.35 V 0.35 Sn 0.25 Sb 0.05 feedstock solution with varying total metal concentration. Scanning electron microscopy combined with EDS elemental analysis showed that the coatings exhibited a loose and porous morphology, with Ti, V, Sn and Sb elements uniformly distributed throughout. X-ray diffraction analysis identified characteristic diffraction peaks corresponding to VO 2 , SnO 2 , Sb 2 O 5 and TiO 2 in the coatings. The electrocatalytic properties of the coatings were evaluated using multiple electrochemical techniques, and the electrode prepared using the 1.0 M feedstock solution demonstrated the best performance. Antimicrobial test showed that after 30-s electrolysis, the disinfection rates of simulated tap water against E. coli and S. aureus exceeded 88.1% and 96.8%, respectively, whereas for the 0.06 M NaCl solution, both pathogens were inactivated by over 99.9% within 15 s. Additionally, methylene blue degradation reached 98.4% after 45 min of electrolysis. This study provides a new strategy for producing low-cost chlorine-evolving electrodes with potential application in antibacterial and wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2026
·
IF 5.5
Lu Kun-Rong,Li Dong-Yang,Wang Hong-Yu,Han Yue-Xi,Shi Fa-Nian,Wang Peng-Fei,Zhang Yu-Hang
Polyethylene oxide (PEO)-based polymer electrolytes hold promise for application in solid-state lithium metal batteries. However, the high crystallinity of PEO poses a significant challenge to ion transport, particularly limiting its room-temperature performance. Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), a semi-crystalline polymer with rigid fluorocarbon chains, can provide robust mechanical support to the electrolyte system. Herein, a quasi-solid electrolyte (QSE) was fabricated by using PEO and PVDF-HFP, in which succinonitrile (SN) was introduced as a plasticizer to enhance the electrochemical properties at room temperature. Innovatively, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) was employed as a shield layer to prevent direct contact between the Li anode and the prepared SN-modified PEO/PVDF-HFP-QSE, thus forming a stable anode/electrolyte interface. The obtained TTE-P 8 P 2 S(12%)-QSE exhibits high room-temperature electrochemical properties, with an ionic conductivity of 4.02 × 10 –4 S cm –1 , a lithium-ion transport number of 0.47, and a wide electrochemical window of 5.4 V vs. Li + /Li. By interfacial modification, TTE-P 8 P 2 S(12%)-QSE can enable long-term cycling of LiCoO 2 cathodes and Li anodes, with an initial discharge capacity of 126.9 mAh g –1 , and achieve an average capacity of 142.8 mAh g –1 within 100 cycles at room temperature. Characterizations reveal that the incorporation of TTE preserves the structural integrity of the lithium electrodes, promotes efficient utilization of active lithium ions, and tailors the composition and structure of the solid-electrolyte interphase (SEI) on the lithium metal anode, thereby substantially enhancing interfacial stability. This work provides a feasible strategy for building high-energy-density lithium metal batteries for room-temperature applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Yang Xia,Si Shi,Chongge Li,Chu Liang,Yongping Gan,Hui Huang,Xinyong Tao,Wenkui Zhang
A series of Sn-doped Li 3 V 2− x Sn x (PO 4 ) 3 /C ( x = 0, 0.1, 0.15, 0.2) samples were synthesized via a citric acid assisted sol–gel method. XRD patterns indicated that all the Li 3 V 2− x Sn x (PO 4 ) 3 /C samples were pure single phase with a monoclinic structure (space group P 2 1 / n ) and well crystallized. The structural refinement results and HRTEM analysis both indicated that Sn-doping did not alter the lattice structure of Li 3 V 2 (PO 4 ) 3 , but increased the unit cell volume. SEM images revealed that Sn-doping has no obvious effects on the morphology and particle size of Li 3 V 2 (PO 4 ) 3 . HRTEM, XRF and Raman results demonstrated that a thin carbon layer was coated on the surface of Li 3 V 2− x Sn x (PO 4 ) 3 /C samples with a similar carbon content and good quality. The electrochemical performance was evaluated using coin-type half cells. Among the samples synthesized in this work, Li 3 V 1.85 Sn 0.15 (PO 4 ) 3 /C exhibited the electrochemical performance in terms of specific capacity, rate capability, cycling performance. CV and EIS results implied that optimizing Sn-doping contents with x = 0.15 could greatly enhance the structural stability of Li 3 V 2 (PO 4 ) 3 during the charge–discharge processes, as well as increase electrical conductivity with a lower charge transfer resistance and a higher Li + diffusion coefficient .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）