APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 11
·1-12
·
IF 2.8
Song Ziyan,Ma Ruolong,Zheng Xiaodan,Zhang Limeng,Ruan Chuanda,Yan Xiaohui,Tian Fei
In this study, Fe 3 O 4 @C@Cu 2 O was synthesized using a solvothermal method. The morphology and structural characteristics of the material were systematically investigated through various characterization techniques, including TEM, XPS, FT-IR, DLS, and VSM. Its antibacterial efficacy was assessed through colony counting. Results showed that at a concentration of 0.5 mg/mL, Fe 3 O 4 @C@Cu 2 O nanoparticles with a copper atomic percentage of 2.42% achieved bactericidal rates of 98.45% against E. coli and 90.58% against S. aureus . Compared to pure Fe 3 O 4 @C and Cu 2 O, the composite material demonstrated a 100% bactericidal rate against E. coli and 99.23% against S. aureus . Notably, after five cycles, the composite nanoparticles maintained effective bactericidal rates, with 82.16% against S. aureus and 94.72% against E. coli . SEM images of bacterial morphology and EPR tests confirmed that the antibacterial mechanism primarily involves the generation of reactive oxygen species(ROS).
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Small
·
2026
·
IF 12.1
Zhiting Jiang,Yanyan Gao,Qiuping Ding,Yanmin Yang,Leipeng Li
Optically stimulated luminescence (OSL) materials can convert trapped charge carriers into light under controllable light stimulation, thus holding great promise for diverse applications such as radiation dose detection and anti-counterfeiting. Nevertheless, previous OSL signals are located in the visible or near-infrared regions, overlapping seriously with the ambient light and thus hindering the application potential. Herein, we report a type of double perovskite structured phosphor, Cs 2 NaYF 6 :Pr 3+ , capable of emitting ultraviolet-C (UVC) OSL. Upon X-ray irradiation, Cs 2 NaYF 6 :Pr 3+ can store the excitation energy in terms of trapped charge carriers. In addition, it exhibits strong and persistent UVC luminescence under continuous light stimulation over a wide wavelength range or heating. By investigating the wavelength-dependent stimulated luminescence phenomenon and trap-clearing capability, we elaborate on the influence of excitation wavelength on UVC OSL. Leveraging the luminescent properties of Cs 2 NaYF 6 :Pr 3+ , we further demonstrate its potential application in tracking and marking in bright environments when exposed to sunlight irradiation. This work clarifies the generation mechanism of UVC OSL and its dependence on stimulation wavelength, thereby providing insights for the exploration of more UVC OSL materials.
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CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 20
·28968-28975
·
IF 4.527
Dan Yu,Yongqiang Tan,Haibin Zhang
(Ti 1-x Nb x )C (x=0, 0.2, 0.5 and 0.8) ceramic solid solutions were prepared by spark plasma sintering and their oxidation behaviours were investigated at 1000 °C in air. The niobium content was found to exhibit a remarkable influence on the oxidation resistance of (Ti 1-x Nb x )C solid solutions. An optimization of oxidation resistance was achieved in (Ti 0.8 Nb 0.2 )C. After oxidation at 1000 °C for 4 h, the oxidation layer thickness of (Ti 0.8 Nb 0.2 )C is less than 1/4 of the oxidation layer thickness of monolithic TiC. The higher oxidation resistance can be ascribed to the presence of Nb-doped rutile TiO 2 phase in the oxidation layer of (Ti 0.8 Nb 0.2 )C. The (Ti,Nb)O 2 phase suppressed the abnormal grain growth and the formation of cracks in the oxide layer, more importantly, it could effectively sluggish the outward diffusion of titanium during oxidation.
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CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 16
·23334-23340
·
IF 5.532
Hanghang Li,Xinhao Cai,Jing Li,Chenchen Deng,Yiwen Liu,Huihui Yan,Haoxiang Yu,Liyuan Zhang,Miao Shui,Lei Yan,Jie Shu
Titanium niobate prepared by traditional techniques has the shortcomings of low ion diffusion coefficient as well as poor electrical conductivity , which drastically reduce its applicability. In this work, we prepare carbon coated Ti 2 Nb 10 O 29 hollow submicron ribbons (Ti 2 Nb 10 O 29 @C HSR) using a simple electrospinning procedure. As anode material for lithium-ion batteries (LIBs), it delivers a high charge capacity of 259.7 mAh g −1 at 1 C with low capacity loss of 0.013% in long-term cycles. Increased the current density to 5 C, Ti 2 Nb 10 O 29 @C HSR can maintain a reversible capacity of 189.9 mAh g −1 , indicating its good rate performance. Additionally, this work uses in-situ X-ray diffraction (XRD) to provide an explanation for the lithium storage process in Ti 2 Nb 10 O 29 @C HSR, demonstrating the high reversibility during charge/discharge cycles. Therefore, Ti 2 Nb 10 O 29 @C HSR has outstanding cycle adaptability and structural reversibility to be a promising anode for LIBs.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
无机功能材料
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Nano Energy
·
2020
·
IF 16.602
Na Zhao,Jian Qin,Lujia Chu,Linzhe Wang,Dan Xu,Xiujuan Wang,Huijuan Yang,Jiujun Zhang,XiFei Li
The development of potassium ion batteries is restricted by the intrinsic large ion radius, resulting in dramatic volume change of electrodes and slow faradic reaction in kinetics. High requirements are proposed for the structure design of anodes. In this work, Se coating-Sb nanocrystalls-three dimensional interconnected carbon networks (3D Se@Sb@C) heterogeneous structure was prepared by a low-temperature template-assisted CVD method. The network and sandwich structure can not only shorten the solid-state diffusion path of K + , but also alleviate the volume change of Sb. Moreover, the hetero interface between Se and Sb can form chemical bonding and further generate heterogeneous junctions in electrochemical reactions, providing more electron states at the Fermi energy level and reducing the ionic diffusion barrier of K + . Benefiting from it, the 3D Se@Sb@C electrode possess an optimized energy storage mechanism and exhibits an outstanding rate performance and an ultra-long lifespan of more than 5000 cycles with 87% of capacity retention, which is rarely reported for PIB anodes. It reveals the important role of heterogeneous structure in potassium storage, which can inspire other researchers to achieve superior electrochemical performance by interface engineering for electrode materials.
研究领域:
材料科学
·
电化学
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ACS Catalysis
·
2026
·Vol. 16
·期 14
·13525-13536
·
IF 13.6
Wang Yue,Zhang Qi,Han Chunqiu,Jia Wenlong,Liu Huai,Zhang Rui,Peng Lincai,Lv Tianping,Ye Liqun,Zhang Junhua
Photocatalytic activation of C–H bonds in biomassderived molecules represents a promising strategy for biomass
upgrading. However, the efficiency of selective C–H bond activation
and oxidation is severely restricted by the sluggish kinetics of photogenerated carriers and the uncontrollable generation of reactive oxygen species. Herein, we delicately dispersed Yb single atoms on
ZnIn2S4 nanosheets that boost the photocatalytic directional activation of C–H in 5-hydroxymethylfurfural (HMF). The optimized
Yb0.8-ZIS achieves a balance between 2,5-diformylfuran selectivity
(99.8%) and production rate (906.6 μmol g–1 h–1
) under ambient
conditions. Mechanistic studies reveal that Yb single atoms not only
effectively modulate the electronic structure of ZnIn2S4 but also
serve as hole extractors, thereby enhancing the separation of photogenerated carriers and the activation of oxygen. Furthermore, the ligand-to-metal charge transfer between Lewis acidic Yb sites and
HMF effectively reduces the electron density of the α-C–H bond, thus accelerating the activation process. This work offers insight
into the rational design of rare-earth single atoms for modulating both charge dynamics and molecular activation in selective C–H
activation and oxidation.
KEYWORDS: Yb single-atom, C–H activation, electronic structure, photocatalytic oxidation, 5-hydroxymethylfurfural
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2026
·
IF 3.2
Si Liu,Yukun Zhang,Yan Sun,Xiaoyan Dong
Boosting the catalytic performance of an enzyme through controlled conformational regulation in vitro remains challenging due to its intrinsic structural complexity and conformational instability. Herein, we report a straightforward thermal activation strategy that induces permanent conformational remodeling of cytochrome c (Cyt c) toward a catalytically favorable state. The activated Cyt c exhibits up to 4.4-fold biocatalytic activity enhancement compared to the native enzyme and maintains its full activity over at least 7 days of storage. Mechanistic investigations combining experimental characterization and molecular simulations reveal that activity enhancement is governed by a well-defined structural evolution at the molecular level. Thermal activation drives a local unfolding–refolding transition in the vicinity of the catalytic center, leading to the opening of the catalytic gate and a pronounced increase in substrate accessibility. Simultaneously, the coordination environment between heme Fe and Met80 S changes to a relaxed conformation, whereas the Fe–N (His18) coordination remains relatively rigid during the thermal activation. This asymmetric coordination modulation establishes a balanced heme microenvironment that ensures both high substrate accessibility and structural integrity of the heme center, thus enabling efficient catalysis without compromising robustness. These findings elucidate a clear structure–activity relationship linking thermally induced conformational evolution to enhanced enzyme–substrate interactions and catalytic performance and demonstrate thermal activation as an effective strategy for modulating metalloenzyme catalysis.
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Nature Communications
·
2026
·
IF 18.1
Zhang Mengen,Wang Ruijia,Yu Yunbo,Ren Liuxuan,Jia Tinghao,Ren Congjing,Wang Jingdai,Yang Yongrong,Yang Yao
C-H functionalization shows significant potential for upgrading low-cost semi-crystalline polyolefins. However, current homogeneous functionalization methods encounter an inherent trade-off between crystallinity and functionalization, severely limiting the application of resulting functional polyolefins in both emerging and previously established fields. Here, we demonstrate an electrostatic-confinement-induced C-H functionalization strategy that decouples the functionalization from the crystallinity of resultant functionalized polyolefins in a well-controlled manner. During functionalization, multivalent cations spatially confine electronegative polar functional groups within amorphous domains through electrostatic interactions. This enables highly selective functionalization of amorphous regions at temperature approaching the melting point, yielding functionalized polyethylene exhibiting a higher crystalline fraction, larger crystallite dimensions, and distinct nanoscale sheet-like aggregates of incorporated polar groups. These structural improvements elevate melting temperatures and impart mechanical property enhancement to a typical prototype. This strategy highlights the potential for overcoming traditional crystallinity-functionalization trade-offs in post-polymerization functionalization and offers promising avenues for advanced materials development with target properties.
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PNAS Nexus
·
2023
·Vol. 2
·期 6
·
IF 0
Wang Zhaolong,Xie Mingzhu,Guo Qing,Liao Yibo,Zhang Ce,Chen Yongping,Dong Zhichao,Duan Huigao
Freezing phenomenon has troubled people for centuries, and efforts have been made to lower the liquid freezing temperature, raise the surface temperature, or mechanical deicing. Inspired by the elytra of beetle, we demonstrate a novel functional surface for directional penetration of liquid to reduce icing. The bionic functional surface is fabricated by projection microstereolithography (PµSL) based three dimensional printing technique with the wettability on its two sides tailored by TiO2 nanoparticle sizing agent. A water droplet penetrates from the hydrophobic side to the superhydrophilic side of such a bionic functional surface within 20 ms, but it is blocked in the opposite direction. Most significantly, the penetration time of a water droplet through such a bionic functional surface is much shorter than the freezing time on it, even though the temperature is as low as −90°C. This work opens a gate for the development of functional devices for liquid collection, condensation, especially for hyperantifogging/freezing.
研究领域:
材料科学
·
生物仿生学
·
表面工程
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhukun Zhang,Dongxian Li,Jia Wang,Jianchun Jiang
Thermochemical conversion is one of the most effective ways to upcycle organic solid wastes into fuels and/or value-added chemicals. In this study, the tandem hydropyrolysis/hydrocracking of polystyrene (PS) to produce ethylbenzene was studied using metal nitrides as catalysts. Fe, N co-doped carbon-based catalyst (Fe 2 N @ C) with core-shell structure was synthesized. The experimental results showed that carbon doping significantly improved the catalytic performance of iron nitride. The yield of ethylbenzene obtained from Fe 2 N @ C catalysis was 81 wt%, which is much higher than that of Fe 2 N (63.3 wt%) and commercial iron nitride (FeN, 4.9 wt%) under the hydropyrolysis temperature of 480 ℃, hydrocracking temperature of 280 ℃, and low H 2 pressure of 0.2 MPa. The high catalytic activity of Fe 2 N @ C is ascribed to the synergy of metal-based selective hydrogenation and acid site-mediated C-C bond activation. This work provides a flexible and efficient catalytic technology for the high-value utilization of polystyrene waste.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 21
·26189-26201
·
IF 2.478
Zhang Xian-Hui,Liu Jun-Jun,Zha Liang-Liang,Chen Ji-Wei,Chen Bao,Wu Jian-Hua,Yu Hong-Liang
MnZn ferrites and their magnetic, electrical, and optical properties make them highly suitable in a number of applications. These ferrites are used in electronic applications, magnetic fluids, and household appliances such as washing machines, refrigerators, and microwave ovens. This paper focuses on a hydrothermal method used to prepare a bayberry spherical manganese–zinc ferrite (Mn 0.5 Zn 0.5 Fe 2 O 4 ), its surface was coated with dopamine (Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA) and then carbonized to obtain the core–shell structure C-Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA. Preliminary results show that carbon-coated manganese–zinc ferrite with saturation magnetic properties and coercivity increased from 99 emu and 66.01 Oe to 138 emu and 104.85 Oe, respectively. In addition, the carbonized Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA (C-Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA) exhibited favorable microwave absorbing performance with minimum reflection loss (RL min ) of − 17.56 dB and also revealed that the broadest effective absorption bandwidth (RL min ≤ − 10 dB) 5.36 GHz (11.70–17.06 GHz) can be achieved at 2.0 mm.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yongsong Ma,Kaifa Du,Yifan Guo,Mengyi Tang,Huayi Yin,Xuhui Mao,Dihua Wang
Greenhouse gases carbon dioxide (CO 2 ) can be converted into high value-added carbon materials by molten salt electrolysis. Herein, we employ CO 2 as the inorganic carbon source to prepare a core–shell catalyst (Co@C) by molten salt electrolysis for the activation of peroxymonosulfate (PMS) to degrade diethyl phthalate (DEP). The electrolytic Co@C catalyst presents a high catalytic performance for the degradation of DEP with a high turnover frequency (TOF) value (2.28 min −1 ), a relatively low catalyst dosage (Cat = 50 mg L –1 ), low oxidant concentration (PMS = 0.46 mM), a wide range of pH applicability (pH = 3–9), and low activation energy ( E a = 38.88 kJ mol −1 ). In addition, the Co leaching rate is low (<1 mg L –1 ) in the pH range of 5–11 and the total organic carbon (TOC) removal was reached 78.9% under the catalyst dosage was 50 mg L –1 . The DEP degradation pathways mainly involved ethyl formate elimination, ethoxy abstraction, carboxyl abstraction, decarboxylation, hydroxy abstraction, esterification and ring cleavage of DEP. Further, theoretical calculations confirm that Co nanoparticles (Co NPs) encapsulated with graphitized carbon shell derived from CO 2 reduce the work function (WF) of catalysts, enhance the length of bond O–O ( I O-O ) of PMS molecule, and facilitate the charge transfer from the catalysts to PMS molecule. This work provides a new insight into the utilization of CO 2 served as inorganic carbon sources and the design of heterogeneous catalysts.
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