CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xinwen Liu,Bingchu Mei,Weiwei Li,Yu Yang,Guoqiang Yi,Zhiwei Zhou,Zuodong Liu
2 at.% Yb:Sr 5 (PO 4 ) 3 F nanoparticles were synthesized by co-precipitation method. By using XRD , FT-IR and FE-SEM measurements, the influence of reactive conditions, including pH value, reactive temperature and mixing mode on the phase composition and microstructure of these nanoparticles were investigated. The results showed that pure Yb:Sr 5 (PO 4 ) 3 F nanopowders were produced by adding sodium hydroxide solution into S-FAP emulsion under alkaline environment or neutral environment. Agglomeration degree of the nanoparticles decreases and then increases with the increase of pH value and the aggregation was lowest when the pH value was 12. Spherical or nearly spherical nanoparticles with mean size of 24.0 nm were obtained in the environment of 20 °C and pH = 12. TEM results showed that the powders produced by fast mixing model (fast stirring and fast mixing) have more homogenous microstructure. The Yb:Sr 5 (PO 4 ) 3 F ceramic with a transmittance of 45% at 1500 nm was fabricated by hot-pressing the synthesized nanopowders. SEM results showed that residual pores and unsintered second phase are the main scattering sources of the as-prepared Yb:S-FAP ceramics.
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Mengjue Cao,Yi Feng,Qian Chen,Pengcheng Zhang,Shihang Guo,Jianfeng Yao
In this study, melamine sponge (MS) is modified by in-situ growth of leaf-like Co-ZIF-L without the addition of additives or surfactants . Such modified MS shows good underwater superoleophobicity because of the unique pore structure and highly rough surface of MS@Co-ZIF-L. Compared to the pristine MS, the water-wetted MS@Co-ZIF-L exhibits excellent water-oil separation for various oils (the separation efficiencies are higher than 99.2%) with good long-term stability (no decrease in flux and separation efficiency after 60 cycles of separation). Moreover, MS@Co-ZIF-L is highly effective to treat oil-water emulsions. Besides the excellent separation performance, due to the outstanding mechanical properties, MS@Co-ZIF-L can be shaped into various configurations such as membranes, filters, adsorbing foams or other forms for the oil/water separation in various situations.
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Dan Xue,Wen Wang,Longhai Piao,Mufang Li,Shuang Wang,Chenxue Xiang,Dong Wang
With the rapid development of electronic information technology, flexible transparent materials have been widely concerned and studied by researchers. Traditional transparent films have some problems in flexibility, transparency, or preparation method, which restrict their further development in scale production and application. Herein, we have developed a simple method by embedding the mass produced PVA- co -PE nanofibers into the PVP polymer matrix through photopolymerization method to produce a Polyvinyl Pyrrolidone/PVA- co -PE (PVP/NFs) composite film with high flexibility and transparency. Due to the nanoscale size and small refractive index contrast between nanofiber and PVP, the PVP/NFs composite film showed high light transmittance of 85.87%. In addition, the filling of PVA- co -PE nanofibers had a synergistic enhancement effect on the mechanical properties and thermal stability of PVP/NFs composite film. The tensile stress was as high as 16.6 MPa with a nanofiber content of 37.67 wt%, which was 4.05 times higher than that of the pure PVA- co -PE nanofiber film, and 2.81 times higher than that of the pure PVP film. Furthermore, the excellent flexibility of the PVP/NFs composite film enabled it to withstand a large-scale bending deformation under the action of external forces. The high flexibility, optical transparency and fast preparation made the PVP/NFs composite film a great application prospect in the intelligent electronic equipment and smart buildings.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 2
·024001
·
IF 3.551
Yuantao Pei,Haijun Zhang,Lei Han,Liang Huang,Longhao Dong,Quanli Jia,Shaowei Zhang
Development an alternative approach to efficiently and economically produce hydrogen from water to replace non-renewable fossil fuels is one of the great challenges in the energy field. In this paper, a Co foam (CF) with 90% porosity and pore size of a few tens of micrometers was prepared, on which FeCoP nanoflowers were in-situ formed. Such a combination was used as a new electrocatalyst/self-supporting electrode for high efficiency hydrogen evolution reaction. Thanks to the larger surface area (and thus many more active sites), and quicker mass transfer through the porous structure, the CF supported FeCoP electrode exhibited much better hydrogen evolution reaction (HER) performance than the commercial Ni foam supported counterpart prepared under identical conditions. In the case of the former, only −44 mV overpotential was required to achieve a geometric current density of −10 mA cm−2, and the electrode showed a high stability at a current density < −500 mA cm−2. The electrode developed in this work could be potentially used as a novel electrode for future large-scale production of hydrogen. In addition, the novel strategy reported here could be similarly used to develop many other types of self-supporting electrodes with further improved HER performance.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Lei Wang,Xudong Liu,Xiaoguo Bi,Zhixin Ma,Jinsheng Li,Xudong Sun
(Ln + Nb) co-doped TiO2 polycrystalline ceramics possess remarkable dielectric behaviors, but their origin is still not fully understood. Compared to ceramic materials, a single crystal could keep most of the original material’s properties and eliminate interference due to grain boundaries and pores, thereby useful for exploring the origin of the material’s properties. Here, Ga3+ with a radius close to that of the Ti4+ ion was selected as an acceptor ion to study the properties. To this end, rutile single crystals and (Nb + Ga) co-doped rutile single crystals were prepared by the Verneuil method. The permittivity of the doped single crystal at frequencies from 20 Hz to 2 MHz was found to be greater than 15,000, and the dielectric loss was kept below 0.08. The latter value was much smaller than the reported values of rutile single crystal samples. Electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy indicated significantly enhanced dielectric properties, mainly attributed to the highly localized electron-pinned defect dipoles rather than the surface barrier layer capacitor effect. The electrons tightly bounded by the local electric dipole defect clusters can only range over a very small distance, which made the doped crystal have a large dielectric constant over a wide frequency range and maintain a low dielectric loss. In sum, the use of single crystals as a research object greatly provided insights into the origin and optimization of giant dielectric properties of TiO2-based materials.
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高影响因子
Catalysts
·
2017
·Vol. 7
·期 4
·106
·
IF 3.082
Xiuling Zhang,Zhibin Zhan,Zhuang Li,Lanbo Di
High performance catalysts for carbon monoxide (CO) oxidation were obtained through thermal activation of a CuBTC (BTC: 1,3,5-benzenetricarboxylic acid) metal–organic framework (MOF) in various atmospheres. X-ray diffraction (XRD), X-ray photonelectron spectroscopy (XPS), N2adsorption–desorption measurement, and field emission scanning electron microscopy (FESEM) were adopted to characterize the catalysts. The results show that thermal activation by reductive H2may greatly destroy the structure of CuBTC. Inert Ar gas has a weak influence on the structure of CuBTC. Therefore, these two catalysts exhibit low CO oxidation activity. Activating with O2is effective for CuBTC catalysts, since active CuO species may be obtained due to the slight collapse of CuBTC structure. The highest activity is obtained when activating with CO reaction gas, since many pores and more effective Cu2O is formed during the thermal activation process. These results show that the structure and chemical state of coordinated metallic ions in MOFs are adjustable by controlling the activation conditions. This work provides an effective method for designing and fabricating high performance catalysts for CO oxidation based on MOFs.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Le Yang,Na Wang,Bairui Tao,Fengjuan Miao,Yu Zang,Paul K. Chu
Palladium (Pd) nanoparticles in combination with naturally abundant materials are stable and highly active catalysts for hydrogen production . Herein, Co(OH) 2 nanosheet arrays are prepared hydrothermally on graphene/nickel foam (graphene/NF) to produce Co(OH) 2 /graphene/NF which provides the desirable three-dimensional (3D) substrate for subsequent Pd electrodeposition to obtain Pd/Co(OH) 2 /graphene/NF. The materials exhibit excellent durability and catalytic performance in the hydrogen evolution reaction (HER) in an alkaline environment such as a low overpotential of 124 mV at 10 mA cm −2 and Tafel slop of 53 mVdec −1 . The excellent performance is attributed to the synergistic catalytic effects rendered by the nanostructured interfaces between the Pd nanoparticles and Co(OH) 2 nanosheet arrays as well as large surface area . The technique and materials have large potential in energy conversion applications.
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高影响因子
Chem
·
2018
·
IF 14.104
Mingyang Xing,Wenjing Xu,Chencheng Dong,Yaocai Bai,Jingbin Zeng,Yi Zhou,Jinlong Zhang,Yadong Yin
Advanced oxidation processes (AOPs) are widely proposed for treating persistent pollutants by the ⋅ OH radicals generated from H 2 O 2 decomposition. However, their broad applications in practical settings have been hampered by the low efficiency of H 2 O 2 decomposition. Here, we report that metal sulfides (MoS 2 , WS 2 , Cr 2 S 3 , CoS 2 , PbS, or ZnS) can serve as excellent co-catalysts to greatly increase the efficiency of H 2 O 2 decomposition and significantly decrease the required dosage of H 2 O 2 and Fe 2+ in AOPs. Unsaturated S atoms on the surface of metal sulfides can capture protons to form H 2 S and expose metallic active sites with reductive properties to accelerate the rate-limiting step of Fe 3+ /Fe 2+ conversion. The efficiency of AOPs involving co-catalysts can be further enhanced by visible-light illumination thanks to the sensitization of organic pollutants. This discovery is expected to drive great advances in the use of AOPs for large-scale practical applications such as environmental remediation.
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高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2025
·
IF 11.5
Haoyang Yuan,Peifu Xiao,Fan Wang,Chen Guo,Shu Pan,Mai Jiang,Shicheng Hou,Yunong Sun,Yibo Wang,Yu Zhang,Tian Yin,Haibing He,Jingxin Gou,Xing Tang
Epithelial cell entrance and trans-epithelial transport are two essential processes that directly affect the efficacy of oral delivery of nanocarriers. Herein, a hydroxyethyl starch-based nanocapsule dual decorated with butyrate and octadecylamine (ODA) was first constructed to enhance transporter-mediated endocytosis and trans-epithelial transport, while reducing exenatide (EXT) loss during absorption. The epithelial barrier was then treated with linoleic acid (LA), which functioned as a cell membrane fluidity regulator. This treatment further improved oral delivery efficiency by lowering the energy cost of endocytosis through fluidizing of the cell membrane and increasing monocarboxylate transporter 1 (MCT1) expression on cell surfaces. The findings revealed that LA upregulated MCT1 expression by 3.26-fold, increased the cellular uptake of nanocapsules co-modified with butyrate and ODA by 4.52-fold, decreased ATP consumption for uptake in LA-pretreated Caco-2 cells to only 18.64 % of that in untreated Caco-2 cells, and increased their transcellular transport by 1.72-fold in a Caco-2/HT29-MTX-E12 co-culture monolayer. Therefore, the oral administration of EXT-loaded Bu-PEG-ODA NCs with LA significantly enhanced the oral bioavailability of EXT (Bu-PEG-ODA NCs group: 10.10 %, Bu-PEG-ODA NCs + LA group: 14.84 %), leading to a significant hypoglycemic effect with a 16.06 % relative pharmacological availability. This dosing strategy exhibited efficacious blood glucose control and pancreatic function recovery capabilities in the type 2 diabetes rat model. This study presents a unique co-optimization strategy based on two key processes in the oral absorption of nanocarriers, yielding significant advancements in the oral bioavailability of nanomedicines and improving their therapeutic efficacy.
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产品关联
DOI
PubMed
高影响因子
Matter
·
2025
·
IF 17.5
Yingnan Wang,Jinting Wu,Qian Zhang,Yingjun Tan,Jian Gao,Xiao-Dong Zhu,Yong-Chao Zhang,Shaojun Guo
Given the trade-off between activity and selectivity, typical pure CoSe 2 catalyst that excels in the initial proton-coupled electron transfer, however, usually underperforms in the subsequent reaction process, leading to low performance for acidic 2e − oxygen reduction reaction (ORR) to H 2 O 2 . Here, we report a class of Zn–Co pair active sites on the defected CoSe 2- x . The Zn–Co pair active site can well modulate electronic structure for enhancing the adsorption and activation of ∗O 2 to achieve high-selectivity electrosynthesis of H 2 O 2 . The surrounding Co site has the optimal Gibbs free energy for ∗OOH because of the d-p orbital hybridization between the near-end O (∗OOH) and Co near the Fermi level. The Zn 1 -Co/CoSe 2- x catalyst achieves high selectivity of 95% under 0 V against a reversible hydrogen electrode (RHE) and the maximum productivity of 2.26 mol g cat. −1 h −1 at 250 mA cm −2 , which is among the best non-noble metal-based compound catalysts in an acidic medium.
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 2
·582-588
·
IF 1.1
Zhang Mengyi,Cheng Zhengzai,Yang Mian,Yu Qianwen,Tan Zhiping,Wandji Djouonkep Lesly Dasilva,Cheng Junpeng,Liu Panpan,Ding Ling,Gauthier Mario
High molecular weight poly(1,4-butylene 2,5-furandicarboxylate-co-isosorbide 2,5-furandicarboxylate) copolyesters (PBSIF- x ) were synthesized via melt-polycondensation of 2,5-furandicarboxylic acid (FDCA), with varying ratios of isosorbide (ISB) and 1,4-butylene glycol (BDO) catalyzed by antimony trioxide (Sb 2 O 3 ). The PBSIF -x structures were investigated using FTIR and 1 H NMR, while the GPC analysis exhibited the copolyesters molecular weights with number average molecular mass ( M n ) in the range of 11 079–15 153 g/mol. The DSC results show that PBSIF- x copolyesters have a single glass-transition temperature ( T g ) (77.45–110.96 °C), increasing with the increase in ISB content, while TGA analysis demonstrates excellent thermal stability up to 320 °C. From the thermal result, properties of PBSIF- x copolyesters are found to be within the interval of their parent homologues poly(butylene 2,5-furandicarboxylate) (PBF) and poly(isosorbide 2,5-furandicarboxylate) (PIF), which confirms the aromatic/aliphatic blending within the polymer matrix for enhanced polymer stability and performance.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhikang Xu,Yunxing Zhang,Xing Wu,Haibo Zhu
Co-based catalysts are emerging as one of the most promising catalysts for propane dehydrogenation (PDH) due to their abundant availability, environmental friendliness, and efficient activation of the C–H bond. Isolated Co(II) is recognized as the active site for activating the C–H bond in PDH; however, the controllable synthesis of Co catalysts with well-defined isolated Co(II) remains a challenge. In this study, a direct and straightforward route was developed for the synthesis of Co-Beta using a fluorine-assisted hydrothermal crystallization method. The structure of Co-Beta was studied using various characterization tools, including XRD, STEM, H 2 -TPR, UV–vis, XPS, solid-state 29 Si MAS NMR and EXAFS techniques. It was confirmed that the Co species are incorporated into the structure of Beta zeolite, existing as isolated Co(II) sites embedded within the framework of Beta zeolite. The optimized catalyst, 1.0Co-Beta, exhibits excellent performance in PDH, achieving a propane conversion of approximately 50 % and propylene selectivity of around 96 % at 600 °C. This performance surpasses that of previously reported non-noble metal catalysts. This study provides fundamental insights on the design and synthesis of highly dispersed metal oxide catalysts for PDH.
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高影响因子
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