SCRIPTA MATERIALIA
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2019
·
IF 4.539
Qiang Liu,Penghui Chen,Nan Jiang,Xing Zhang,Xiaoying Li,Sha Su,Zewang Hu,Haohong Chen,Tengfei Xie,Jiang Li
8.7 mol% Y 2 O 3 -ZrO 2 (Y 0.16 Zr 0.84 O 1.92 ) precursor was synthesized by the co-precipitation method using ammonia as the precipitant. The Y 0.16 Zr 0.84 O 1.92 powders calcined at 800 °C show a pure c-ZrO 2 phase. The average crystallite size of the powders is 12.4 nm and weakly agglomerated to an average particle size of 15.5 nm. Y 0.16 Zr 0.84 O 1.92 transparent ceramics were then successfully fabricated by pre-sintering at 1350 °C for 2 h and HIP post-treatment at 1750 °C for 1 h under 200 MPa without sintering additives. The in-line transmittance of Y 0.16 Zr 0.84 O 1.92 ceramics (1 mm thick) exceeds 50.3% in the region of 400–850 nm, reaching about 65.3% at 800 nm.
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DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Binbin Wan,Junying Li,Feng Ma,Ning Yu,Wenjing Zhang,Lujie Jiang,Hengshan Wei
The immobilized metal affinity cryogels based on poly(2-hydroxyethyl methacrylate-co-glycidyl methacrylate) (p(HEMA-GMA)) containing hydroxy and epoxy groups were prepared by free-radical copolymerization under cryogenic condition and then functionalized with iminodiacetic acid and chelated Cu2+, Ca2+, and Fe3+ ions to the p(HEMA-GMA) cryogel. The structures of p(HEMA-GMA) and immobilized metal-affinity cryogels were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy (SEM)–energy dispersive X-ray spectroscopy. SEM results showed that the prepared cryogels had interconnected pores with the size of 30–100 μm. The performance of water swelling into the cryogels was fitted in Fickian diffusion. The adsorption property of cryogels was influenced by the immobilized ionic type, temperature, and adsorbate. The adsorption capacity of immobilized Cu2+ cryogel (p(HEMA)–Cu2+ (0.5 M) cryogel) was the highest in comparison with that of Ca2+ and Fe3+ affinity cryogels under the same condition. The maximum adsorption capacity of p(HEMA)–Cu2+ (0.5 M) cryogel for porcine pancreatic lipase was 150.14 mg/g at a higher temperature of 35 °C, whereas for bovine serum albumin, the maximum adsorption capacity was 154.11 mg/g at a lower temperature of 25 °C. The research of thermodynamics and kinetics indicated that the mechanism of the protein adsorption process corresponded to the Langmuir model and pseudo-second-order model.
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DOI
PubMed
高影响因子
Results in Physics
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2019
·
IF 3.042
Yang Zhou,Xiaoyuan Liu,Ke Wang,Jing Li,Xinglai Zhang,Xin Jin,Xinyue Tang,Xiuhui Zhu,Ruishi Zhang,Xin Jiang,Baodan Liu
Series of “Hopcalite” catalysts for low-temperature CO oxidation are prepared through a facile ultra-sonic spray pyrolysis approach. It has been found that the spray pyrolysis temperature and Cu/Mn atomic ratio in initial precursors show significant impacts on the catalytic activity of Cu-Mn-O catalysts. The catalyst synthesized at 550 °C with Cu/Mn = 1/2 in precursor (Cu1Mn2-550) shows the highest catalytic activity towards CO oxidation (T 100 = 63 °C; E a = 17.04 KJ mol −1 ), owing to the formation of CuMn 2 O 4 phase with poor crystallinity. The synergistic effect of Cu and Mn species in spinel Cu-Mn-O phases attributes to the evaluated catalytic activity compared with those of pure oxides of copper or manganese towards CO oxidation. The results reveal that Cu1Mn2-550 not only provides more defects and vacancies to create more active sites, but also generates more highly active Cu (II) to promote CO oxidation. On the contrary, the decreasing amount of Cu (II) and the higher degree of crystallinity resulting from higher synthesis temperature lead to the deterioration of catalytic activity. Moreover, the phase transformation among the Cu x Mn 3-x O 4 spinels also shows significant effect on CO conversion rate. Finally, the formation mechanism of Cu-Mn-O catalysts and related CO oxidation process are discussed based on series of characterizations.
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高影响因子
JOURNAL OF LUMINESCENCE
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2018
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IF 2.732
Zengchao Yu,Xiaoxiao Li,Xin Wang,Yanmin Yang
In this paper, Yb 3+ /Er 3+ , Yb 3+ /Tm 3+ and Yb 3+ /Er 3+ /Tm 3+ co-doped β -NaYF 4 up-conversion fluorescent nanoparticles (UCNPs) with an average diameter of 50 nm were successfully synthesized through a thermal decomposition method. The Yb 3+ /Er 3+ co-doped UCNPs possess bright and tunable luminescence varying from green to red as the ratio of Yb 3+ and Er 3+ doping increases. Remarkably, white up-conversion luminescence can be successfully achieved through the incorporation of Tm 3+ . The white light up-conversion efficiency of Yb 3+ /Er 3+ /Tm 3+ co-doped UCNPs dispersed in the solvent have been calculated, suggesting the potentials of the efficient white up-conversion emissions for the multispectral imaging and potential bio-applications.
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高影响因子
APPLIED CLAY SCIENCE
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2019
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IF 3.89
Chun Hui Zhou,Li Cun Jun,Will P. Gates,Ting Ting Zhu,Yu Wei Hua
Organo-montmorillonite (OMt) has been widely used in paints, drilling fluids, clay/polymer nanocomposites , adsorbents and biosensors , however the full potential of OMt is yet to be discovered. The co-introduction of cationic and nonionic species into Mt has great potential to expand modification strategies and applications of Mt However, details regarding the intercalation mechanism of dual organic species remain unclear and the aspects of hydrophobicity and swellability of OMt are unknown. In this work, the co-introduction into OMt of octadecyltrimethylammonium (ODTMA + ) cations and a nonionic specie erucamide (EA), and ODTMA + with an oleamide (OA). was investigated. The resultant OMt samples were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. Hydrophobicity and swellability of the OMt were examined. The results showed that neither EA nor OA could be effectively introduced into the interlayer spaces of Mt, although adsorption of EA and OA onto the external surface of Mt did occur. In the presence of ODTMA + , however, both EA and OA were successfully co-intercalated into the interlayer spaces of Mt, and the basal spacing (d 001 ) of ODTMA + , EA and OA co-intercalated OMt increased to as much as 4.2 nm. Such dual modification appeared to be effective at tailoring hydrophobicity. The swellability of ODTMA + , EA and OA co-intercalated OMt in xylene increased with the increase in the amount of EA and OA loaded. When Mt was modified using 1.0 CEC ODTMA + with 0.5–1.75 CEC EA, 0.2 g OMt in 10 mL xylene swelled to take 10 ml volume, equating to a swell index of 100%. Here, a two-stage intercalation is proposed: cationic exchange of ODTMA + to form a paraffin-type monolayer, followed by hydrophobic entropy-driven adsorption of nonionic EA and OA by intertwining organic chains into the interlayer spaces of the OMt The findings show the promise of co-intercalation to introduce many other cations and nonionic organic species into the interlayer spaces of Mt, and thus greatly expands the types of OMt for new applications.
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高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 35
·4789-4800
·
IF 4.76
Zongke He,Hui Niu,Nan Zheng,Shuhui Liu,Yang Li
A series of elastomeric hydrogels with repeated processability were prepared in this work. These hydrogels were obtained by cross-linking of two common polymers, poly(ethylene-co-propylene) (ethylene-propylene rubber, EPR) and poly(ethylene glycol) (PEG), via dynamic covalent bonds, specifically, through firstly furyl functionalization of EPR at the side groups and maleimide modification of PEG at the chain ends, and followed by the Diels–Alder reaction between furan and maleimide to construct thermoreversible EPR–PEG networks. The composition and microstructure of the network were adjustable in a wide range by facilely tuning the PEG feeding ratios and molecular weights (as the cross-linking agent). In the network the crystalline PEG and the elastic EPR endowed the material with strength and toughness respectively in the dry state, giving a fracture strength of 4–6 MPa and elongation at break of up to 380%; meanwhile, due to the hydrophilicity of PEG, the network could absorb water and form hydrogels, in which the hydrophobic EPR elastomer enhanced the hydrogels effectively. By tailoring the amount and the chain structure of the PEG moiety, the water absorption of the copolymer could reach as high as 356% in 1 hour, and the hydrogel elongation at break could achieve ∼400%, which was comparable to that of pristine cross-linked EPR. The material displayed low cytotoxicity in MC3T3-L1 cells and was biocompatible.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Yunqing Pi,Peng Zhao,Lingjia Ma,Yangdan Cao,Huiqing Gao,Shuying Dong,Jianhui Sun
The Co(OH) 2 /reduced graphene oxide hybrids (Co(OH) 2 /rGO) was prepared and used as catalyst to enhanced heterogeneous activation of Oxone for the decomposition of Levofloxacin (LVF). The Co(OH) 2 /rGO composites with different Co(OH) 2 loading have been successfully synthesized, where the sample contain 20% Co(OH) 2 exhibited superior activation, attributing to the synergistic effect between Co(OH) 2 and rGO. Meanwhile, the effects of some important reaction parameters on the decomposition of LVF by Co(OH) 2 /rGO/Oxone process were investigated. The results indicated that the decomposition rate of LVF(>94.5%) was increased with the increasing of Oxone concentration, and 20% Co(OH) 2 /rGO dosage neutral pH. Moreover, the Co(OH) 2 /rGO catalyst showed high activity and stability during the repeated experiments.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Chao Xia,Caiyan Yu,Mengmeng Cao,Jinfeng Xia,Danyu Jiang,Guohong Zhou,Dafeng Zhang,Huili Li
In this work, a new Eu and Tb co-doped luminescent compound based on MOF-5, [Zn 4 O(BDC) 3 ], (named as compound 1 ) was successfully synthesized. The structure and morphology characterizations demonstrate that the initial framework of MOF-5 is retained well after co-doping Eu and Tb. The systematic investigations of photoluminescence behaviors reveal that the heat-treated compound 1 (called as compound 1a ) can be utilized as a multi-channel readout luminescent thermometer in emission intensity ratio, decay time ratio, and luminescence color. It simultaneously exhibits the excellent repetitiveness and reversibility under high temperature region from 303 to 473 K. The relative sensitivity of 1.8%/K at 473 K is much higher than the best one of 1.19%/K previously reported for the mixed-lanthanide MOF Tb 0.8 Eu 0.2 BPDA. Until now, such a ratiometric luminescent thermometer with a high sensitivity at the temperature as high as 473 K has been rarely explored.
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高影响因子
FUEL PROCESSING TECHNOLOGY
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2018
·
IF 3.956
Qilei Yang,Ang Cao,Na Kang,Kang An,Zhao-Tie Liu,Yuan Liu
The catalyst for direct ethanol synthesis (DES) from syngas was investigated in this work, which is Co/La 2 O 3 -doped La 4 Ga 2 O 9 . The catalyst was prepared by using LaCo 1−x Ga x O 3 with perovskite phase as the precursor to intensify the interaction in the elements of Co, La and Ga. The catalysts were characterized by using XRD , H 2 -TPR, TEM , EDS, XPS , BET, ICP and TG techniques. This catalyst showed high selectivity to ethanol and excellent stability including excellent resistance to sintering and carbon deposition . It seems that the ethanol is generated in the interface between metallic Co and La 4 Ga 2 O 9 , and in the interface cobalt would be positively charged due to the interaction between Co nanoparticles and La 4 Ga 2 O 9 . The results and the related discussions indicate that Co/La 2 O 3 -doped La 4 Ga 2 O 9 catalyst is a promising catalyst for DES from syngas. Graphical abstracts.
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高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2018
·Vol. 41
·期 6
·1122-1131
·
IF 1.588
Ziyi Zhao,Guijin Liu,Qing Lin,Yanbin Jiang
Paracetamol (PCA) and trimethylglycine (TMG) were co-crystallized and micronized by means of the supercritical anti-solvent (SAS) process to improve the tabletability of PCA. The effects of operating conditions on particle properties were investigated in detail. Characterizations were performed to confirm the co-crystal state of PCA-TMG. The results indicated that the same crystal form with different crystal habits was prepared. The optimal PCA-TMG co-crystals presented a much larger tensile strength, higher drug content of PCA, and smaller particle size than those obtained using the ball milling (BM) process. The SAS-processed PCA-TMG co-crystals showed an enhanced solubility, dissolution rate, and tableting performance compared to that of BM.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Lijing Wang,Gan Jin,Yanhong Shi,Hao Zhang,Haiming Xie,Bai Yang,Haizhu Sun
Two-dimensional (2D) ZnS-SnS 2 porous nanosheets are designed as clean and low cost photocatalysts for water splitting. The composites successfully combine high photoelectron reduction potential of ZnS with the sufficient sunlight harvesting ability of SnS 2 . Moreover, SnS 2 acts as an effective electron transfer medium from ZnS to SnS 2 due to the construction of quasi-type II structure. This greatly promotes the transfer of electron-hole pairs and effectively inhibits their recombination. Especially, the unique porous nanosheets structure maintains them high specific surface area and countless reactive sites, which increases the reactants' contact area and facilitates the migration of carriers upon photocatalysis . This further suppresses the charge recombination and improves the photocatalysts' stability. As a result, an optimized specific surface area of 246.7 m 2 g −1 and photocatalytic H 2 generation rate of 536 μmol h −1 g −1 are achieved in the absence of a surfactant and co-catalyst, which is 10 times higher than ZnS and 17 times higher than SnS 2 . In addition, the porous nanosheets have fairly good photocatalytic stability and can be reused at least five cycles without obvious changes in activity and structure. This work successfully presents the potential of ZnS and SnS 2 -based photocatalyst for clean and low cost hydrogen production from water splitting.
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高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 35
·期 5
·1700379
·
IF 4.384
Xiaotong Li,Junshu Zhang,Shufang Kou,Xianfeng Yang,Xia Guo,Jian Yang
Pt/Co and Au are organized into well-defined nanostructures by a simple and mild method, such as dumbbell-like nanorods and core–shell nanorods. The resultant dumbbell-like nanorods show a superior performance in the electrooxidation of formic acid, as compared with core–shell nanorods, Pt-tipped gold nanorods, and commercial Pt/C. This result can be attributed to electronic effect between Au and Pt, heteroatom effect of Co, irregular surface at the tips, and the interface effect.
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高影响因子
危险品化学品经营许可证（带存储）