SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Rui You,Dong-Dong Han,Fangmeng Liu,Yong-Lai Zhang,Geyu Lu
In this work, we reported the fabrication of flexible NO 2 sensors arrays operating at room temperature on a composite film of In 2 O 3 and graphene oxide (GO) by direct laser writing (DLW) technology. The laser treatment not only induced the photoreduction of GO , leading to a highly porous structure due to the removal of oxygen groups, but also permitted mask-free patterning through a programmable manner, enabling flexible integration of sensor arrays on any substrates. We demonstrated the fabrication of a 2 × 4 NO 2 sensors array on a flexible polyimide substrate within 10 min. Our NO 2 sensors based on In 2 O 3 and reduced GO (In 2 O 3 @RGO) show liner NO 2 sensing properties at room temperature, good responsivity and recovery properties, as well as excellent selectivity towards NO 2 . We deem that the DLW fabrication of flexible NO 2 sensorsarrays may contribute to the development of flexible electronics.
研究领域:
材料科学
·
传感器技术
·
纳米材料
·
环境监测
·
柔性电子学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yan Zhang,Xiuxiu Wang,Fenqiang Luo,Yang Tan,Lingxing Zeng,Baizeng Fang,Aihua Liu
It is a great challenge to develop cost-effective and stable oxygen evolution reaction (OER) electrocatalysts for energy sustainability. Herein, we report nanocomposites of rock salt type nickel oxide and cobalt oxide supported on ordered mesoporous carbon (OMC) as efficient non-noble metal electrocatalysts for the OER in alkaline solution. The rock salt type Ni x Co y O x+y @OMC (x/y = 0:1,2:1,1:1,1:2,1:0) nanocomposites are synthesized through a nanocasting and carbon thermal reduction route by using the OMC as a nano-reactor. The OMC is used as the support material, with large specific surface area and pore volume, which can not only effectively disperse metal oxides nanoparticles and prevent the agglomeration of nanoparticles, but also improve electrocatalytic performance of metal oxides by increasing electrical conductivity and electrocatalytic active sites. Interestingly, the rock salt type NiCo 2 O 3 @OMC exhibits the lowest overpotential of 281 mV at 10 mA/cm 2 in 1 M KOH, which is even lower than those values reported previously for RuO 2 and IrO 2 precious catalysts, and a small Tafel slope of 96.8 mV/dec for the OER. Notably, the NiCo 2 O 3 @OMC has a turnover frequency value of 0.0341 s −1 and an actual oxygen generation rate of ca. 22.5 μmol/h, much higher than its counterparts, confirming its outstanding intrinsic activity as an OER catalyst. Furthermore, the NiCo 2 O 3 @OMC has a good durability without obvious attenuation after continuous operation test for 230 h. Evidently, the NiCo 2 O 3 @OMC catalyst can remarkably promote the OER, and thus brighten the prospect of non-noble metal for efficient water electrolysis in industrial scale.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米催化
·
可持续能源
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 72
·45420-45431
·
IF 3.108
Jiuli Guo,Huanhuan Yu,Feng Dong,Baolin Zhu,Weiping Huang,Shoumin Zhang
A highly efficient and stable Au–Cu/hydroxyapatite (HAP, Ca10(PO4)6(OH)2) catalyst was reported. HAP was prepared through a deposition–precipitation method. Au–Cu/HAP catalysts were obtained by a two-step impregnation approach. The samples were characterized by XRD, TEM, SEM, UV-Vis, ICP, XPS, H2-TPR, and O2-TPD. CO oxidation reaction was carried out to evaluate the catalytic performance of samples. TEM and UV-Vis results showed that the metallic particles supported on Au–Cu/HAP were smaller than those on Au/HAP, and they were highly dispersed on the HAP support. Patterns of XPS revealed that CuO nanoparticles were formed in the Cu/HAP catalyst, while CuO and Cu2O species coexisted in Au–Cu/HAP catalyst. Based on the O2-TPD data, the addition of copper to Au/HAP gave rise to more new O2 adsorption sites and bigger O2 adsorption capacity. The catalysis results indicated that the Au–Cu/HAP was capable of obtaining higher efficiency and stability compared with Au/HAP and Cu/HAP for CO oxidation. It was likely that the synergistic interaction between gold and CuOx phase created the most active sites on Au–Cu/HAP and was responsible for the enhanced activity and stability in comparison with Au/HAP and Cu/HAP.
研究领域:
催化化学
·
材料科学
·
环境化学
·
纳米催化
·
表面科学
✓ 已验证
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2015
·Vol. 94
·期 3
·424-429
·
IF 1.231
Xia Gui,Ying Ding,Zhi Yun
An integrated approach was developed for preparing epoxy fatty acid methyl esters (EFAMEs) from cottonseed using a two-phase solvent extraction (TPSE) process followed by sequential base-catalyzed transesterification and epoxidation reactions. The TPSE process was performed to achieve simultaneous production of high-quality crude cottonseed oil and nontoxic cottonseed meal. The base-catalyzed transesterification of the cottonseed oil proceeded smoothly at 30 °C over 2 h to provide a high yield of fatty acid methyl esters (FAMEs). Subsequent epoxidation of the unsaturated FAMEs using petroleum ether as a non-polar solvent, H 3 PO 4 as a catalyst, 0.3 g/g H 2 O 2 as an oxygen donor, and HCOOH as an oxygen carrier gave the corresponding EFAMEs with a conversion to oxirane of 0.85 g/g. The order of effectiveness of catalysts was found to be H 3 PO 4 > TiO 2 > H 2 SO 4 > strong-acid cation exchange resin. The bio-based integrated process and new methods for the preparation of modified EFAMEs show great promise for comprehensive development and commercial applications of cottonseed with fewer steps and lower cost.
研究领域:
应用化学
·
油脂化学
·
生物基材料
·
绿色化工
·
天然产物转化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Hui Wang,Houzhen Chen,Hongjiao Wang,Lei Wu,Qixing Wu,Zhongkuan Luo,Fang Wang
The electrochemical performance of the lithium−oxygen (Li−O 2 ) batteries largely depends on the material and architecture of the catalytic cathode. In this paper, to avoid the parasitic reactions of carbon and binder with discharge products and reaction intermediates, we proposed an effective design of a free-standing catalytic cathode for Li−O 2 batteries. The FeCo 2 O 4 @Ni electrode consists of FeCo 2 O 4 nanosheets grown directly on nickel (Ni) foam. The resultant hierarchical macroporous/mesoporous structure provides sufficient space for the insoluble discharge product Li 2 O 2 and catalytically active sites for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Consequently, the carbon- and binder-free self-supporting electrode has demonstrated a high discharge capacity with relatively low charge overvoltage and a better cycle performance than the corresponding carbon-based electrodes.
研究领域:
电化学
·
能源材料
·
纳米材料
·
电催化
·
储能技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Zhan Shu,Yi Zhang,Jing Ouyang,Huaming Yang
A novel antibacterial nanocomposite, CeO 2 -ZnO/HNTs was prepared by a homogeneous co-precipitation method in ethanol solution. ZnO and CeO 2 nanoparticles with sizes of approximately 8 and 4 nm, respectively, were dispersively precipitated onto the surface of halloysite nanotubes (HNTs). HNTs served as a template for reducing the agglomeration of ZnO nanoparticles and improving the interface reactions between the nanocomposite and bacteria cells. CeO 2 nanoparticles were introduced to suppress the recombination of electron-hole pairs, and narrow the energy gap of ZnO nanoparticles. The synergistic effects of ZnO, CeO 2 nanoparticles and HNTs led to the superior antibacterial activity of the CeO 2 -ZnO/HNTs nanocomposite against gram-negative Escherichia coli.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·
IF 2.4
Liu Zhiqiang,Li Hui,Wang Zhiteng,Li Xiaobing,Lan Huixin,Zhu Zhenhe,Zhuang Yi,Wu Yuchen,Li Jiajia,Yao Huan,Gao Runbo
Efficient and stable lithium-ion batteries (LIBs) have garnered considerable attention; yet, the development of anode electrode materials continues to pose substantial challenges. While CoO electrode material boasts an ideal specific theoretical capacity, it is not without drawbacks, including significant volume expansion and concerns over safety performance, which hinder its viability as an anode material. In this research, we synthesized CoO/Co 3 O 4 through a straightforward secondary hydrothermal treatment that locally oxidizes CoO, simultaneously creating oxygen vacancies. The incorporation of oxygen vacancies enhances the material’s internal conductivity and expedites the diffusion of electrons and ions, culminating in superior rate performance. Furthermore, the heterojunction structure diminishes the diffusion barrier, significantly enhancing the electrode’s reaction kinetics and overall electrochemical performance. At a modest current density of 0.1 A g −1 , the CoO/Co 3 O 4 composite demonstrates enhanced cycling stability, delivering a capacity of 1022 mAh g −1 after 100 cycles. Remarkably, even at an elevated current density of 1 A g −1 , it sustains a capacity of 768.8 mAh g −1 over 400 cycles. The method of creating oxygen vacancies via autoxidation may pave the way for the advancement of multivalent oxide anode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 4
·e20286
·
IF 3.5
Shu Li,Wenjie Wei,Guangyu Wang,Zemeng Weng,Boya Zhang,Zhanmin Cao
The phase equilibria information of the CaO–SbO x system in the range of 700–1580°C in air was obtained for the first time using quenching method and thermal analysis. The equilibrium phase compositions were determined using x-ray diffraction and Scanning Electron Microscopy-Energy Dispersion Spectrum. The invariant reaction temperatures were determined using thermogravimetry-differential scanning calorimetry. A perovskite solid solution between Ca 2 Sb 2 O 7 and CaO, designated as (Ca 6 Sb 2 O 11 ) s.s , was observed. Within this solid solution, three polymorphic forms were identified: orthorhombic, tetragonal, and cubic. The transition temperatures between these polymorphic forms vary with compositional changes. Additionally, the crystal structure of cubic Ca 6 Sb 2 O 11 was analyzed. CaSb 2 O 6 was observed to decompose into Ca 2 Sb 2 O 7 , Sb 4 O 6 , and O 2 above 1336 ± 5°C. The eutectic temperature of α-Sb 2 O 4 and CaSb 2 O 6 was found to be 1220 ± 5°C.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 55
·12842-12848
·
IF 5.16
Hong Li,Xiao-Fang Jia,Qing Zhao,Ju-Ping Ma,Jian-Dang Liu,Bang-Jiao Ye,Yoshihiro Kuroiwa,Chikako Moriyoshi,Zhi-Yong Li,Qi Liu,Jun-Ying Zhang,Hong-Tao Sun
Graphical Beyond ferroelectricity : The defective [Bi 2 O 2 ] 2+ layers in Aurivillius phases show broadband near-IR luminescence that covers the telecommunication and biological optical windows (see figure). The luminescence was identified to stem from oxygen vacancies and defect complexes. This offers a probe for the examination of defect states in Aurivillius-phase ferroelectrics and possibilities for coupling both physical behaviors. Aurivillius phases have been routinely known as excellent ferroelectrics and have rarely been deemed as materials that luminesce in the near-infrared (NIR) region. Herein, it is shown that the Aurivillius phases can demonstrate broadband NIR luminescence that covers telecommunication and biological optical windows. Experimental characterization of the model system Bi 2.14 Sr 0.75 Ta 2 O 9− x , combined with theoretical calculations, help to establish that the NIR luminescence originates from defective [Bi 2 O 2 ] 2+ layers. Importantly, the generality of this finding is validated based on observations of a rich bank of NIR luminescence characteristics in other Aurivillius phases. This work highlights that incorporating defects into infinitely repeating [Bi 2 O 2 ] 2+ layers can be used as a powerful tool to space-selectively impart unusual luminescence emitters to Aurivillius-phase ferroelectrics, which not only offers an optical probe for the examination of defect states in ferroelectrics, but also provides possibilities for coupling of the ferroelectric property with NIR luminescence.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
DOI
高影响因子
ACADEMIC RADIOLOGY
·
2025
·
IF 3.9
Tingting Luo,Lei Yao,You Wu,Yi Zhang,Lian Lu,Peng He,Ningshan Li,Xiaoxiao Dong,Zheng Liu
Rationale and Objectives Ultrasound-stimulated microbubbles cavitation (USMC) has been proved to improve tumor blood perfusion, which is closely related to the rise in nitric oxide (NO) bioavailability. This study was aimed to investigate whether the co-administration of USMC and NO signaling molecule could contribute to a further enhancement of tumor perfusion. Materials and Methods Ninety-six MC38 tumor-bearing mice were divided into eight groups to compare the efficacy of different NO-related molecules alone and in combination with USMC, including L -arginine ( L -Arg), NOC-18 and sodium nitrite (SN). To better evaluate the changes of tumor perfusion, six mice in each group received contrast-enhanced ultrasound imaging and the other six received ultra-resolution microscopy before and after treatment. Differences in NO generation and tumor hypoxia after treatments were also compared to identify an ideal co-therapy strategy. Further, inhibitors of NO synthase and NO receptor were adopted to explore mechanisms of the co-therapy in improving tumor perfusion. Results Contrast-enhanced ultrasound imaging and ultra-resolution microscopy showed that USMC and SN had a positive synergistic effect in improving tumor perfusion. NO synthase inhibitor failed to block this effect while NO receptor inhibitor did. The tumor perfusion enhancement accompanied with the alleviation of tumor hypoxia and the increase of NO production. L -Arg and NOC-18 did not demonstrate synergistic effects with USMC. Conclusion Co-administration of USMC and NO pathway is a promising modality to alleviate tumor hypoperfusion and hypoxia, among which SN is an effective reagent playing a positive synergistic effect with USMC.
研究领域:
肿瘤学
·
医学影像学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Junmin Qian,Abdalrheem Jarelnaby Musa Aldai,Weijun Xu,Taibing Wang,Kunkun Zhao,Yaping Wang,Jingjing Fan,Aili Suo
Cuproptosis shows great prospects in cancer treatments. However, insufficient intracellular copper amount, low-level redox homeostasis, and hypoxic tumor microenvironment severely restrict cuproptosis efficacy. Herein, hydrazided hyaluronan-templated decorated CuO 2 -doxorubicin (CuDT) nanodot clusters (NCs) are developed for efficient doxorubicin (DOX)-sensitized cuproptosis therapy in breast cancer via a three-pronged strategy. The CuDT NCs with an average size of 56.2 nm are fabricated from 3,3′-dithiobis(propionohydrazide)-conjugated hyaluronan, Cu 2+ , and DOX through a one-pot mineralization process. The CuDT nanoparticles exhibit pH-responsive H 2 O 2 , Cu 2+ , and DOX release profiles and catalytic activity. Upon entrance into tumor cells, CuO 2 -based exogenous H 2 O 2 supply and DOX-augmented endogenous H 2 O 2 generation jointly elevate intracellular H 2 O 2 level, which can further be transformed into hydroxyl radicals and O 2 through Fenton-like reaction to achieve oxidative stress amplification and hypoxia relief, respectively. Moreover, the CuDT NCs can efficiently deplete intracellular overexpressed glutathione via Cu 2+ /Cu + cycle and abundant disulfide bonds, further enhancing cellular oxidative stress. These results demonstrate that the novel CuDT NCs achieve DOX-sensitized cuproptosis in breast cancer cells through elevating copper level, amplifying oxidative stress and alleviating hypoxia, and display prominent in vivo antitumor efficacy. Such a three-pronged strategy of targetedly boosting cuproptosis in cancer cells represents a novel approach for antitumor treatments.
研究领域:
肿瘤学
·
药理学
·
纳米医学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Lina Wang,Peiyi Yan,Huairui Chen,Zhuo Li,Shu Jin,Xiaoxiang Xu,Jun Qian
Narrow bandgap semiconductor MgIn 2 S 4 has been readily grown onto In 2 O 3 nanofibers by an in situ growing method. The so-formed MgIn 2 S 4 -In 2 O 3 hybrid nanofibers are characterized by strong visible light absorption and intimate MgIn 2 S 4 /In 2 O 3 heterointerfaces. Under visible light illumination ( λ ≥ 400 nm), the hybrid nanofibers demonstrate an exceptionally high photocatalytic activity for Escherichia coli ( E. coli ) disinfection, outcompeting pristine MgIn 2 S 4 , naked In 2 O 3 nanofibers, and many other photocatalytic systems reported. Specifically, the hybrid nanofibers achieve a 7 log reduction in viable cells for merely 20 min illumination while pristine MgIn 2 S 4 and naked In 2 O 3 nanofibers alone are almost inactive. Further analysis indicates that the hybrid nanofibers essentially form a type-II semiconductor heterojunctions which enable spatial separation of photocarriers. Owing to the intimate heterointerfaces, photocarriers can be promptly separated and accumulated respectively in In 2 O 3 and MgIn 2 S 4 thereby allowing continuous generation of copious reactive species for disinfection. This work signifies the usefulness of heterointerfaces in promoting photocarrier separation and provides a useful strategy to upgrade photocatalytic performance from otherwise almost inactive semiconductors.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）