CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Chenhao Zhu,Liyang Lin,Benrun Shi,Yu He,Shuo Gao,Yan Wang,Tingbo Wang
Most studies on Mn-based NTC thermistors have been limited to fixed or narrow Ni/Co ratios, lacking a systematic investigation of the full compositional range. This gap impedes the rational and precise design of high-performance thermistors. Here, we prepared Co x Ni 1-x Mn 2 O 4 (x = 0, 0.25, 0.5, 0.75, 1) series thermistors via solid-state reaction, achieving single-phase spinel structures across all compositions. The grain size of Co x Ni 1-x Mn 2 O 4 dropped sharply when the Co content reached 0.5, then increased slightly as x was raised further to 1. The Co 0.25 Ni 0.75 Mn 2 O 4 (x = 0.25) thermistor exhibited the lowest resistivity (1.42 kΩ at 25 °C), while Co 0.75 Ni 0.25 Mn 2 O 4 (x = 0.75) delivered optimal comprehensive performance, combining low resistivity (4.16 kΩ) with high sensitivity (B 25-50 = 3.38 × 10 3 K). When the Co content reached the maximum (x = 1), the thermistor exhibited the highest B 25-50 (up to 3.96 × 10 3 K), corresponding to the optimal sensitivity in the temperature measurement range. The resistivity of Mn-Co-Ni based thermistors is mainly determined by the concentration of Mn 3+ /Mn 4+ ion pairs (especially Mn 3+ ) and additionally modulated by the grain size (grain boundary resistance), which establishes a clear structure-performance correlation for the system. This work provides technical references for developing high-performance, precisely designable Mn-based thermistors and lays a foundation for rational Ni/Co ratio regulation in similar spinel NTC systems.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Shuangfu Wang,Yudong Li,Weizhong Zheng,Weizhen Sun,Ling Zhao
Pyromellitic acid (PMA) is a critical monomer in the synthesis of high-performance polyimides (PIs). A viable approach for the preparation of PMA is the synthesis of durene (DR) by liquid-phase oxidation using a Co/Mn/Br catalyst and acetic acid/water as solvents. Due to interaction between the transition metals Co/Mn and PMA, the catalytic effect is diminished, restricting industrial application of the liquid-phase oxidation method in the production of PMA. Based on the catalyst deactivation mechanism, the effects of different bromine sources, catalyst concentrations, solvent ratios, temperatures, and water contents on the liquid-phase oxidation of DR to PMA were systematically investigated in this work. A deactivation mechanistic model was developed covering DR, PMA, and other pivotal intermediates. Using hydrogen bromide as the bromine source and under conditions of a high solvent ratio, the yield of PMA was enhanced from 34.25 to 78.13 mol %. The kinetic model was utilized to conduct a comprehensive investigation into the impact of catalyst concentrations, temperature, and water content on the reaction and deactivation process. It was determined that the initiation of the DR oxidation chain is a rate-determining step and that the reaction rate increases while the deactivation rate decreases under high temperature and high-Co conditions. Furthermore, it is demonstrated that the optimum water content for the yield of PMA is 5%, with a concomitant slower deactivation reaction rate constant. Hopefully, the results obtained in this work can provide valuable insights into the liquid phase oxidation of polyalkyl aromatic hydrocarbons.
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Machao Wang,Yangmin Tang,Guiqiang Pu,Kai-Kai Liu,Yanwei Hu,Lijia Liu,Wei Chen,Junfeng Chen,Jiacheng Wang,Dong Wang
Halide perovskites are promising for applications in light-emitting diodes, multilevel anti-counterfeiting, and radiation detection due to their excellent luminescence properties. Mn 2+ doping can further tailor the optical properties of perovskites, yet its microscopic mechanism remains insufficiently understood. Here, we report a gradient orbital coupling-enhanced red emission with a nearly tenfold increase in photoluminescence quantum yield by doping 0.12% Mn 2 + into 1D NH 4 CdCl 3 perovskite, constructing asymmetric Cd-Cl-Mn functional units. First-principles calculations indicate that orbital hybridization among Cd(5s, 4d), Cl(3p), and Mn(3d) orbitals in these asymmetric Cd-Cl-Mn units creates a stepped carrier-transport pathway via the formation of coupled gradient orbitals. Transition dipole moment analysis and partial charge mapping reveal that electrons transiently occupy the conduction-band-coupled Mn 3d orbitals before relaxing to the conduction band minimum, while most of the holes are localized at Cd sites. This carrier redistribution enhances radiative recombination, thereby optimizing emission efficiency. The as-prepared semitransparent scintillator films incorporating NH 4 CdCl 3 : Mn deliver strong 630 nm emission under x-ray excitation for high-resolution imaging. Our findings demonstrate that gradient orbital coupling serves as an effective strategy for enhancing luminescence, paving the way for high-efficiency perovskite-based optoelectronic materials and devices.
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Huangxu Li,Xu Wang,Fangyan Liu,Yulun Wu,Jingqiang Zheng,Zezhou Lin,Tiancheng Liu,Jin Xiao,Jianzhong Jiang,Haitao Huang
Fe- and Mn-based polyanionic electrode materials are important cathode materials for sodium-ion batteries (SIBs) due to their low cost. However, due to the low redox potential of Fe2+/3+ and the notorious Jahn–Teller (JT) effect, severe lattice distortion that is associated with Mn2+/3+ redox hinders Fe and Mn redox activation, leading to inadequate cycling stability and rate performance. Here, we discover both high Mn2+/3+ and Fe2+/3+ redox activation in a Na4Mn1.5Fe1.5(PO4)2(P2O7) (NMFPP) material. It is revealed that the substitution of Mn reduces the Fe–O bond covalency, elevating the Fe2+/3+ redox potential to improve the energy density. Furthermore, the JT effect is accompanied by Mn eg orbital splitting, with the dx2–y2 and dz2 orbitals being positioned at the top of the valence band and the bottom of the conduction band, respectively, which primary contributes to reduce the material band gap and facilitate electron transfer. Experimental and theoretical studies discover an anisotropic lattice distortion behavior, which enlarges Na+ diffusion pathways, lowering diffusion energy barriers and enabling rapid Na+ migration. As a consequence, high Fe–Mn redox activity is achieved and the NMFPP demonstrates enhanced energy density, rate performance, and exceptional cycling stability for sodium storage. These findings prove that the JT effect and lattice distortion could synergistically make positive impacts on transition-metal redox activation, which is informative for the design of high-performance electrode materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jiawei Yuan,Jingjing Du,Zixuan Wang,Lihui Ren,Shangwen Zhang,Muhan Chen,Jun Yang,Shu Wei,Jiayun Xu,Hongcheng Sun,Junqiu Liu,Shuangjiang Yu
The development of advanced therapeutic stents to increase anticancer efficiency and bolster antitumor immunity remains a considerable challenge. In this work, a therapeutic gel scaffold made from Mn2+-cross-linked sodium alginate (Mn(II)-SA-Gel), which contains a stimulator of interferon genes (STING) agonist (ADU-S100) and an immune checkpoint inhibitor (aCTLA-4), was developed as a drug delivery system for cancer therapy. The gel scaffold preserved its structural integrity and facilitated prolonged drug release via ion coordination exchange with Ca2+ present in bodily fluids. In addition to serving as a cross-linking agent during gel formation, Mn2+ also facilitates the activation of the STING signaling pathway by ADU-S100, induces dendritic cell maturation, and promotes the polarization of M1 macrophages. Moreover, Mn2+ promotes the generation of highly cytotoxic hydroxyl free radicals in the presence of H2O2, and in combination with the immune checkpoint inhibitor aCTLA-4, enhances the T-cell immune response to enhance their powerful tumor cell-killing effect. The findings indicated that Mn(II)-SA-Gel could serve as a promising platform to synergistically stimulate the STING pathway, thereby improving cancer immunotherapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Huimei Shan,Huinan Mo,Yunquan Liu,Chunya Zeng,Sanxi Peng,Hongbin Zhan
Graphene oxide chitosan composite (GOCS) is recognized as an environmentally friendly composite adsorbent because of its stability and abundant functional groups to adsorb heavy metals, and Fe-Mn binary oxides (FMBO) have attracted increasing interest due to their high removal capacity of As(III). However, GOCS is often inefficient for heavy metal adsorption and FMBO suffers poor regeneration for As(III) removal. In this study, we have proposed a method of dopping FMBO into GOCS to obtain a recyclable granular adsorbent (Fe/Mn GOCS) for achieving As(III) removal from aqueous solutions. Characterization of BET, SEM-EDS, XRD , FTIR , and XPS are carried out to confirm the formation of Fe/Mn GOCS and As(III) removal mechanism. Batch experiments are conducted to investigate the effects of operational factors (pH, dosage, coexisting ions, etc.), as well as kinetic, isothermal, and thermodynamic processes. Results show that the removal efficiency ( R e ) of As(III) by Fe/Mn GOCS is about 96 %, which is much higher than those of FeGOCS (66 %), MnGOCS (42 %), and GOCS (8 %), and it increases slightly with the increasing molar ratio of Mn and Fe. This is because amorphous Fe (hydro)oxides (mainly in the form of ferrihydrite) complexation with As(III) is the major mechanism to remove As(III) from aqueous solutions, and it is accompanied by As(III) oxidation mediated by Mn oxides and the complexation of As(III) with oxygen-containing functional groups of GOCS. Charge interaction plays a weaker role in As(III) adsorption, therefore R e is persistently high over a wide range of pH values of 3–10. But the coexisting PO 4 3− can greatly decrease R e by 24.11 %. As(III) adsorption on Fe/Mn GOCS is endothermic and its kinetic process is controlled by pseudo-second-order with a determination coefficient of 0.95. Fitted by the Langmuir isotherm, the maximum adsorption capacity is 108.89 mg/g at 25 °C. After four times regeneration, there is only a slight decrease of <10 % for the R e value. Column adsorption experiments show that Fe/Mn GOCS can effectively reduce As(III) concentration from 10 mg/L to <10 μg/L. This study provides new insights into binary polymer composite modified by binary metal oxides to efficiently remove heavy metals from aquatic environments.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yukun Li,Yongfu Liu,Zhaohua Luo,Zehua Liu,Svenja Hanson,Chengheng Pang,Hui Lin,Haiming Qin,Jun Jiang
Ce/Mn/Cr: Y 3 Al 5 O 12 transparent ceramics with a pure garnet structure and a high color rendering index were prepared by a solid-state reaction method. Mn 2+ and Cr 3+ enhance the emission between 500 and 700 nm and expand the conventional Ce: YAG phosphors spectrum. The Ce 3+ can work both, as activators and sensitizers, and the intense energy transfer from Ce 3+ to Mn 2+ /Cr 3+ is realized through the non-radiative and radiative processes. In the sample with the optimized doping concentration the high color rendering index (CRI) value of 75.3 can be achieved under a 450 nm laser diode excitation. The chromaticity coordinates can be tuned from (0.3125, 0.3232) to (0.2917,0.2851) by varying the doping concentration. With the increasing Mn 2+ /Cr 3+ doping concentration, the lifetime of Ce 3+ , quantum efficiency and luminous efficiency are all gradually decreased. This work effectively offers a scheme for realizing the high color rendering performance of phosphor-converted transparent ceramics in white LEDs/LDs.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yujie Yang,Chengxin Li,Zhuwei Gao,Xinyu Qi,Lan He,Wei Huang,Jieqiong Wang,Zhongxin Liu
In recent years, oily wastewater has become an important factor in environmental pollution. As a transition metal element, manganese is able to introduce new impurity band gaps using d -orbital hybridization to extend the photoresponse range of TiO 2 , thus enabling TiO 2 to be self-cleaned under UV irradiation more easily. Therefore, we synthesized superhydrophobic/submerged superoleophobic Mn@TiO 2 -modified membranes which possess a self-cleaning property under UV light using manganese element-doped titanium dioxide and cotton fabric as the substrate by hydrothermal method and then investigated the relevance between the doping concentration of Mn and super-hydrophobicity. The results showed that water contact angles of prepared membranes with the Mn ions doping concentrations of 0.5 mol/L, 1.0 mol/L, and 1.5 mol/L were 147.89°, 150.43°, and 153.37°, respectively. The membrane with 1.5 mol/L was effective for the separation of the dichloromethane-water mixture. Under Xenon lamp irradiation, three membranes with different concentrations showed a significant temperature increase with the maximum rising to 53.1 ℃ within 2 min, reflecting an excellent photothermal conversion capability. In addition, the decontamination ability of the Mn@TiO 2 membrane was tested under UV light. The Mn@TiO 2 membrane was able to degrade the oil-red solution dripping on the surface, showing that the membrane had a good self-cleaning performance, which was significant for industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Liwei Yang,Fashan Yang,Heng Zhang,Hongyu Zhou,Mengfan Luo,Yunmei Liu,Chuanliang Zhao,Lu Zheng,Bo Lai
At present, the potential mechanism of manganese oxide (MnO 2 ) activation of PI and the key active sites of PI activation are still unclear and controversial. To this end, three different crystal forms of MnO 2 were prepared in this study and used to activate PI to degrade pollutants. The results showed that different crystal types of MnO 2 showed different catalytic abilities, and the order was γ-MnO 2 > α-MnO 2 > β-MnO 2 . Through quenching experiments, EPR tests, Raman experiments and in situ electrochemical experiments, it has been confirmed that electron transfer-mediated non-free radical process is the main mechanism of pollutant degradation , in which the active substance is the highly active metastable intermediate complex (MnO 2 /PI*). Hydroxyl radical (HO • ), superoxide radical (O 2 •− ), singlet oxygen ( 1 O 2 ) and iodine radical (IO 3 • ) did not participate in pollutant degradation. The quantitative structure-activity relationship analysis confirmed that the catalytic performance of MnO 2 was highly positively correlated with the surface Mn(IV) content, which indicated that the surface Mn(IV) site was the main active site. Overall, this study will be of great help to the design and application of manganese dioxide activation for periodate degradation of pollutants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Cong Qin,Zhanxiang Wei,Bing Wang,Yingde Wang
In the realm of gas sensors, p-type metal oxide semiconductor (MOS) usually exhibits inherently low sensitivity toward target gases caused by the hole accumulation layer configuration , which seriously hinders its practical application. Diatomics co-doping is an efficient tactic for adjusting the characteristics of MOS related to gas-sensing due to their synergistic effect . In this work, we controllably synthesized bare Co 3 O 4 , Sn-doped Co 3 O 4 , Mn-doped Co 3 O 4 and Sn/Mn co-doped Co 3 O 4 nanosheets . The experimental results reveal that Sn/Mn co-doped Co 3 O 4 sample presents porous nanosheets structure. 1 mol% Sn/Mn co-doped Co 3 O 4 sensor presents enhanced response [(R g -R a )/R a = 330 %∼40 ppm at 150 °C] toward CO compared with the bare Co 3 O 4 , 1 mol% Sn-doped Co 3 O 4 , and 1 mol% Mn-doped Co 3 O 4 nanosheets. Besides, 1 mol% Sn/Mn co-doped Co 3 O 4 nanosheets show a low limit of detection (500 ppb/experimental value), good stability and selectivity. We infer that the good CO-sensing properties may be ascribed to the oxygen vacancies defects generated by Sn 4+ and Mn 2+ /Mn 3+ co-doping, high Co 3+ ratio, and high specific surface area. This study affords an effective co-doping strategy for enhancing the gas-sensing performances of p-type MOS.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Energy Research
·
2023
·
IF 3.4
Huang Jiamin,Zhang Guanghui,Wang Mingrui,Zhu Jie,Ding Fanshu,Song Chunshan,Guo Xinwen
The catalytic production of higher alcohols (HAs) is a promising path for converting CO2 into value-added chemical products. The application is still limited by the low selectivity of HAs (less than 10%) on most catalysts. Here, we report a tandem catalyst consisting of Mn-Cu-K modified iron carbide and CuZnAlZr catalyst. The modification of iron carbide with Mn, Cu and K promoters improves the formation of HAs (13.5% Sel.), and the construction of tandem catalysts with CuZnAlZr can further enhance the catalytic performance. By examining different catalyst filling methods and the filling ratio of the tandem catalyst, it was found that the powder mixing resulted in a higher selectivity of HAs with a mass ratio of the two components of 1:1, and a synergistic effect leads to a higher selectivity of HAs (15.5%) with about 40% of propanol and butanol among HAs.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yunfei Song,Chengzhi Huang,Yuanfang Li
Vacancy engineering as an effective strategy has been widely employed to regulate the enzyme–mimic activity of nanomaterials by adjusting the surface, electronic structure, and creating more active sites. Herein, we purposed a facile and simple method to acquire transition metal manganese oxide rich in oxygen vacancies (OVs-Mn2O3-400) by pyrolyzing the precursor of the Mn(II)-based metal–organic gel directly. The as-prepared OVs-Mn2O3-400 exhibited superior oxidase-like activity as oxygen vacancies participated in the generation of O2•–. Besides, steady state kinetic constant (Km) and catalytic kinetic constant (Ea) suggested that OVs-Mn2O3-400 had a stronger affinity toward 3,3′,5,5′-tetramethylbenzidine and possessed prominent catalytic performance. By taking 2-phospho-l-ascorbic acid as the substrate, which can be converted into reducing substance ascorbic acid in the presence of alkaline phosphatase (ALP), OVs-Mn2O3-400 can be applied as an efficient nanozyme for ALP colorimetric analysis without the help of destructive H2O2. The colorimetric sensor established by OVs-Mn2O3-400 for ALP detection showed a good linearity from 0.1 to 12 U/L and a lower limit of detection of 0.054 U/L. Our work paves the way for designing enhanced enzyme-like activity nanozymes, which is of significance in biosensing.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）