Catalysts
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2024
·Vol. 14
·期 12
·858
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IF 3.8
Feng Feng,Yajing Liu,Li Yao,Xiuyu Wang
Creatine catalase (CAT), superoxide dismutase (SOD), and NADPH oxidase (NOX) are natural enzyme molecules that play a crucial role in regulating reactive oxygen species (ROS) in biological systems. They maintain life activities and eliminate pathogens by catalyzing various biochemical reactions. However, natural enzymes have some drawbacks in ROS control; they may lose activity under certain environmental conditions, such as high temperatures, extreme pH values, or the presence of organic solvents, which affects their stability and reliability in different applications. The construction of artificial nanozymes is an emerging technology that could probably solve the problems existing in natural enzymes. This study introduces a type of dendritic platinum–iron oxide (DPIO) nanozyme. The unique dendritic structure of this DPIO nanozyme provides a high surface area-to-volume ratio, and the addition of a platinum layer on the surface offers stability, thereby effectively enhancing the catalytic efficiency of producing reactive oxygen species (ROS). The combination of iron-based Fenton reactions and platinum-based Fenton-like reactions in this DPIO nanozyme drastically improves ROS catalytic efficiency. This artificial nanozyme has a high level of biosafety and displays no cytotoxicity. The development of DPIO nanozymes marks a significant advancement in the technology of artificial nanozymes.
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高影响因子
BIOMATERIALS
·
2011
·
IF 7.883
Ao Xia,Yuan Gao,Jing Zhou,Chunyan Li,Tianshe Yang,Dongmei Wu,Limin Wu,Fuyou Li
New core–shell structured NaYF 4 :Yb 3+ ,Tm 3+ @Fe x O y nanocrystals , with 20 nm Yb 3+ ,Tm 3+ -co-doped NaYF 4 nanocrystals as a core and 5 nm Fe x O y nanocrystals as a shell, have been synthesized and characterized by TEM and XRD analysis . These core–shell nanocrystals exhibit excellent near-infrared upconversion luminescence (UCL) emission at 800 nm under excitation by a continuous-wave 980 nm laser and superparamagnetic properties with a saturation magnetization (Ms) of ∼12 emu/g. Water-soluble nanocrystals were obtained by surface ligand exchange of oleic acid-coated precursor nanocrystals, and their internalization within living cells has been investigated by laser scanning UCL microscopy. Furthermore, the obtained core–shell nanocrystals have been applied in dual-modality T 2 -enhanced magnetic resonance (MR) and UCL imaging in vivo of the lymphatic system. Moreover, the toxicity of NaYF 4 :Yb 3+ ,Tm 3+ @Fe x O y nanocrystals has also been evaluated by MTT assay, IC50 values, and histological analysis of lymphatic node sections.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Sixuan Zhang,Jinzhao Huang,Jun Tang,Zehui Liu,Xiaolong Deng
The high entropy alloy (HEA) composed of five or more elements possesses excellent electrochemical hydrogen evolution reaction (HER) performance in alkaline electrolytic water due to the synergistic action of multiple main elements. However, high-entropy alloy catalysts typically have a single structure, and great challenges remain in designing complex structures (heterostructures) to adjust the electron layout to facilitate water decomposition for hydrogen production. Here, we successfully synthesized NiMoCoMnLa@Ni high entropy alloy (HEA/CNTs@Ni) heterostructures electrocatalysts supported on multi-walled carbon nanotubes (CNTs) by a simple two-step low temperature oil phase method. The results showed that the heterogeneous structure of HEA/CNTs and Ni led to electron reconfiguration and accelerated electron transfer rate as well as the optimized hydrogen adsorption energy and the increased number of active sites of catalyst. Therefore, the catalyst showed high electrocatalytic activity and stability for hydrogen evolution reaction. The overpotential is only 146 mV at 10 mA/cm 2 with low Tafel slope of 79 mV/dec in 1 M KOH solution. It is worth noting that the catalyst is maintained at a high current density of 80 mA/cm 2 for 24 h, and its current density does not decrease significantly or even shows a trend of enhancement, which effectively improves its HER performance in alkaline solution. This work provides a valuable guidance for fully exploring the potential of HEA catalyst in alkaline electrochemical hydrogen evolution reactions.
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NPG Asia Materials
·
2017
·Vol. 9
·期 5
·e383
·
IF 9.157
Yin Ting,Zhang Qian,Wu Haigang,Gao Guo,Shapter Joseph G,Shen Yulan,He Qiaozhi,Huang Peng,Qi Wen,Cui Daxiang
Effectively prolonging the residence time of nanoprobes in the tumor region and reducing the accumulation of nanoprobes in the vital organs (for example, lung, liver and spleen) is crucial for high-efficiency photodynamic therapy (PDT) of cancer. Herein, we systematically report an ultra-small and highly stable nanoplatform with diameters of 4, 8 and 13 nm that exhibited excellent photodynamic therapeutic efficacy using Fe 3 O 4 @polymer-NPO/PEG-Glc@Ce6 nanoprobes. Based on the small size effect, the nanoprobes displayed lower cytotoxicity and excellent biocompatibility. Owing to the synergistic virtues of markedly active targeting and intrinsic small size effect, the Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes can effectively prolong their residence time in the tumor region and reduce accumulation in the normal organs. Benefitting from the small size effect, the synthesized Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes exhibited excellent tumor-targeting capability and photodynamic therapeutic efficacy by inhibiting the growth of tumors in mice under visible red light irradiation with a relatively lower power. The successful application of the small size effect in Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes to significantly improve the PDT efficiency in our strategy suggests new building blocks for PDT of tumors and paves a new way for clinical therapies and translation in the near future.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 18
·13633-13637
·
IF 2.019
Liu Yueli,Zhong Qiaohui,Chen Keqiang,Zhou Jing,Yang Xue,Chen Wen
Layered MoS 2 , which is treated as an alternative candidate of graphene, has attracted great attention due to its large intrinsic band gap and relatively high carrier mobility. It is relatively convenient and inexpensive to prepare MoS 2 through chemical synthesis route. Herein, a novel solution-based hot-injection method is used to prepare MoS 2 . Controlling the reaction time leads to the variation of MoS 2 morphologies, which present as quantum dots and nanosheets. Detail studies are carried out to investigate the formation mechanism of MoS 2 . The results indicate that the formation of layered MoS 2 nanosheets follows a bottom-up process, which includes three steps in the order of quantum dots, small pieces and large area nanosheets.
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高影响因子
FUEL
·
2017
·
IF 4.601
Zhong-Qiu Liu,Xian-Yong Wei,Hai-Hong Wu,Wei-Tu Li,Yang-Yang Zhang,Zhi-Min Zong,Feng-Yun Ma,Jing-Mei Liu
Modified microfiber attapulgite (MFA)-supported nickel was prepared by thermally decomposing nickel tetracarbonyl on MFA modified with an acidic ionic liquid (AIL, 1-sulfobutyl-3-methylimidazolium trifluoromethanesulfonate). It was characterized with multiple instruments and used for catalyzing hydroconversion of lignite-related model compounds (LRMCs) oxydibenzene, benzyloxybenzene, and oxybis(methylene)dibenzene. The results indicate that Ni 15% /MFA@AIL effectively catalyzes hydroconversion of the LRMCs to afford cyclanes by inducing the formation of H + , H − , and biatomic active hydrogen.
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高影响因子
ACS Catalysis
·
2017
·
IF 10.614
Chaofeng Zhang,Hongji Li,Jianmin Lu,Xiaochen Zhang,Katherine E. MacArthur,Marc Heggen,Feng Wang
For lignin valorization, simultaneously achieving the efficient cleavage of ether bonds and restraining the condensation of the formed fragments represents a challenge thus far. Herein, we report a two-step oxidation–hydrogenation strategy to achieve this goal. In the oxidation step, the O2/NaNO2/DDQ/NHPI system selectively oxidizes CαH–OH to Cα═O within the β-O-4 structure. In the subsequent hydrogenation step, the α-O-4 and the preoxidized β-O-4 structures are further hydrogenated over a NiMo sulfide catalyst, leading to the cleavage of Cβ–OPh and Cα–OPh bonds. Besides the transformation of lignin model compounds, the yield of phenolic monomers from birch wood is up to 32% by using this two-step strategy. The preoxidation of CαH–OH to Cα═O not only weakens the Cβ–OPh ether bond but also avoids the condensation reactions caused by the presence of Cα+ from dehydroxylation of CαH–OH. Furthermore, the NiMo sulfide prefers to catalyze the hydrogenative cleavage of the Cβ–OPh bond connecting with a Cα═O rather than catalyze the hydrogenation of Cα═O back to the original CαH–OH, which further ensures and utilizes the advantages of preoxidation.
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高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 33
·17325-17334
·
IF 8.867
Guomin Ding,Weicheng Jiao,Rongguo Wang,Yue Niu,Lifeng Hao,Fan Yang,Wenbo Liu
Recently, multifunctional superhydrophobic surfaces with high adhesion behavior have attracted much attention for microdroplet transportation. Here, we report for the first time a multifunctional, rose-petal-like, superhydrophobic graphene film via the self-assembly of graphene oxide (GO) that has self-sensing and fast recovery properties for microdroplet transportation. This superhydrophobic film does not require a hydrophobic coating and has a micro-nanoscale hierarchical structure. Because of its structure, our biomimetic, superhydrophobic film has high adhesive force to water droplets and can be used as a medium for microdroplet transportation. In addition, because the film was constructed using pure graphene, it has excellent conductivity properties and an immediate response system is also built to detect potential damage. Moreover, owing to the gas sensing properties of graphene, our film has self-sensing properties where the resistance of the film increases gradually when water droplets are close to it. What's more, the film has an ultra-fast Joule heating rate of 18 °C s−1. Based on these properties, the recovery time for the resistance of the film can be reduced by 57.7% for water droplet transportation. Therefore, our multifunctional, superhydrophobic graphene film can be used for smart microdroplet manipulation in the future.
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高影响因子
CHEMISTRY OF MATERIALS
·
2016
·
IF 9.407
Wei Huang,Meilin Li,Luozheng Zhang,Tingbin Yang,Zhi Zhang,Hao Zeng,Xing Zhang,Li Dang,Yongye Liang
Recent advances in the power conversion efficiency (PCE) of polymer solar cells (PSCs) have demonstrated their potential for alternative photovoltaic technology. Besides photovoltaic performance, material cost and device fabrication process are among the key factors for practical applications. Herein, we report a facile molecular engineering approach with 4-methoxy modified thiophene as the conjugated side chain for polymer donors, which afforded lower highest occupied molecular orbital (HOMO) energy level and enhanced interchain interactions. Therefore, the corresponding PSCs exhibit enhanced open-circuit voltage and PCE compared with the counterparts with thiophene as the conjugated side chain. When fabricated from a nonhalogenated solvent without any additives, over 8% efficiency could be achieved in a representative polymer, PMOT5. Both the synthetic simplicity of materials and high performance from environmentally friendly solvent improve the accessibility of PSCs.
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高影响因子
ANALYTICAL SCIENCES
·
2017
·Vol. 33
·期 2
·235-238
·
IF 1.228
Xinchao BIAN,Zhiming CHEN,Lidong FENG,Bin SUN,Sheng XIANG,Yanlong LIU,Gao LI,Xuesi CHEN
An analytical method to determine the residual lactide in polylactide (PLA) was proposed using an internal standard method of gas chromatography (GC). PLA samples and diphenyl ether (DPE) as an internal standard were dissolved in dichloromethane, then PLA was precipitated in anhydrous alcohol. The residual lactide and DPE were extracted to alcohol for GC analysis. At room temperature, lactide could react with alcohol and change into ethyl lactoyl lactate (ELL), but the relative response factor of lactide versus DPE could be obtained through a numerical analysis method. Therefore, the residual lactide content could be quantitatively calculated in PLA. The relative standard deviation (RSD) of the measurements is not more than 7.0%, indicating that the method is suitably precise.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
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IF 2.108
Yi Yang,Xiao Chen,Dandan Huang,Wei Ye
Being considered as building blocks, the inorganic nanodimer particles such as Ag-Fe 3 O 4 , Cd-Se and Pt-Fe 3 O 4 , have attracted much attention because of their capability of dual surface functionalization and potential applications in field-emission, data storage and photovoltaic devices. For these motivations and as a continuation of our previous study, a gel with flower-like morphology based on Ag-Fe 3 O 4 nanodimers has been constructed with the carboxylated cyclodextrin (MAH-CD) and Pluronic F127 molecules in mixed solvent of cyclohexane and water. The morphology of Ag-Fe 3 O 4 nanodimers and structure of MAH-CD were characterized by transmission electron microscopy (TEM) and nuclear magnetic resonance (NMR) respectively. The mechanism of gel formation is discussed along with the data obtained from rheological measurement, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Each Ag-Fe 3 O 4 particle was coated by lots of MAH-CD molecules, which were threaded by F127 chains. The gel fabrication is controlled by the inclusion of MAH-CD with F127, the interaction between the carboxyl group and the Fe 3 O 4 surface. The cyclohexane molecules in gel were trapped with F127 by cyclodextrin, which may be packed orderly through hydrogen bond. Meanwhile, the Fe 3 O 4 side of nanodimers provides the anchoring position for carboxyl group to induce the formation of gel. Such an Ag-Fe 3 O 4 nanodimer initiated gel can be used either based on Ag side for catalytic and sensing properties, or based on superparamagnetism from Fe 3 O 4 side.
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高影响因子
OPTICAL MATERIALS
·
2013
·
IF 1.918
Baocun Zhu,Jie Zhao,Haiqin Yu,Liangguo Yan,Qin Wei,Bin Du
Mercury (Hg) commonly found in the global environment poses a serious threat to the environment and human health because of its durability, easy transference and high biological accumulation. So, great attention has been paid to the quantification and removal of mercury. Herein, we present the synthesis and properties of a novel naphthalimide-functionalized magnetic fluorescent nanoparticle for simultaneous determination and removal of Hg 2+ . The proposed nanoparticle showed a good linear relation ( Y = −29.12216 X + 363.2597, correlation coefficient of R 2 = 0.9952) between the fluorescence intensity at 540 nm and the concentration of Hg 2+ varying from 0.1 μmol/L to 4.5 μmol/L. Additionally, our proposed nanoparticle exhibited excellent Hg 2+ -selectivity over other metal ions, which was ascribed to the formation of imide-Hg-imide complexes. The removal of Hg 2+ from contaminated water samples was achieved by the aggregation-induced sedimentation (AIS) strategy. Moreover, the suspended magnetic nanoparticle could be removed by external magnetic field, and the secondary pollution was avoided.
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