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An efficient and reusable bimetallic Ni_3Fe NPs@C catalyst for selective hydrogenation of biomass-derived levulinic acid toγ-valerolactone

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Chinese Journal of Catalysis 2018年第10期39卷 1599-1607页

作者： Haojie Wang Chun Chen Haimin Zhang Guozhong Wang Huijun Zhao Key Laboratory of Materials Physics Centre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyInstitute of Solid State PhysicsChinese Academy of SciencesHefei 230031AnhuiChina University of Science and Technology of China Hefei 230026AnhuiChina centre for Clean Environment and Energy Griffith UniversityQueensland 4222Australia

Bimetallic nanostructures have attracted great interest as efficient catalyst to enhance activity,selectivity and stability in catalytical ***,we report a facile one‐pot carbothermal route to in‐situ controllable synthesize heterogeneous bimetallic Ni3Fe NPs@C *** X‐ray diffraction,transmission electron microscopy,X‐ray photoelectron spectroscopy and N2 adsorption‐description results reveal that the Ni3Fe alloy nanoparticles are evenly embedded in carbon *** as‐prepared Ni3Fe NPs@C catalyst shows excellent selective hydrogenation catalytic performance toward the conversion of levulinic acid(LA)toγ‐valerolactone(GVL)via both direct hydrogenation(DH)and transfer hydrogenation(TH).In DH of LA,the bimetallic catalyst achieved a 93.8%LA conversion efficiency with a 95.5%GVL selectivity and 38.2 mmol g–1 h–1 GVL productivity(under 130°C,2MPa H2 within 2 h),which are 6 and 40 times in comparison with monometallic Ni NPs@C and Fe NPs@C catalysts,*** addition,the identical catalyst displayed a full conversion of LA with almost 100%GVL selectivity and 167.1 mmol g–1 h–1 GVL productivity at 180°C within 0.5 h in TH of *** optimal reaction conditions,the DH and TH catalytic performance of 500‐Ni3Fe NPs@C(3:1)catalyst for converting LA to GVL is comparable to the state‐of‐the‐art noble‐based *** demonstrated capability of bimetallic catalyst design approach to introduce dual‐catalytic functionality for DH and TH reactions could be adoptable for other catalysis processes.

关键词： Levulinic acid γ‐valerolactone Bimetallic catalyst Hydrogenation Dual‐catalytic functionality

Fast patterning and dry-etch of SiN_x for high resolution nanoimprint templates

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Journal of Semiconductors 2009年第6期30卷 138-141页

作者：疏珍万景陆冰睿谢申奇陈宜方屈新萍刘冉 State Key Laboratory of ASIC and System Department of Microelectronics Fudan University Micro and nanotechnology centre Rutherford Appleton Laboratory Chilton Didcot Oxon OX11 0QX UK

We developed a simplified nanofabrication process for imprint templates by fast speed electron beam lithography（EBL） and a dry etch technique on a SiNx substrate,intended for large area *** this end,the highly sensitive chemically amplified resist（CAR）,NEB-22,with negative tone was *** EBL process first defines the template pattern in NEB-22,which is then directly used as an etching mask in the subsequent reactive ion etching（RIE） on the SiNx to form the desired *** properties of both e-beam lithography and dry etch of NEB-22 were carefully studied,indicating significant advantages of this process with some drawbacks compared to when Cr was used as an etching ***,our results open up a good opportunity to fabricate high resolution imprint templates with the prospect of wafer scale manufacturing.

关键词： SiNx templates nanoimprint NEB-22 electron bean lithography reactive ion etch

A Cu/ZnO Nanowire/Cu Resistive Switching Device

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Nano-Micro Letters 2013年第3期5卷 159-162页

作者： Lijie Li Yan Zhang Zhengjun Chew Multidisciplinary nanotechnology centre College of Engineering Swansea University Wuhan University of Technology Institute of Theoretical Physics Lanzhou University Beijing Institute of Nanoengergy and Nanosystem Chinese Academy of Science

A new device has been realized using flip-chip joining two printed circuit boards(PCBs) on which zinc oxide(ZnO) nanowires were synthesized. Energy dispersive X-ray measurement has been conducted for the ZnO nanowires, confirming that Cu elements have been diffused into the nanowires during the chemical growth process. From I-V measurements, this Cu/ZnO nanowire/Cu structure exhibits a resistive tuning behaviour, which varies greatly with the frequency of the applied sinusoidal source.

关键词： Cu/ZnO Nanowires Flip-chip Resistive switching Device

COHERENT ANTI-STOKES RAMAN SCATTERING MICROSCOPY TO MONITOR DRUG DISSOLUTION IN DIFFERENT ORAL PHARMACEUTICAL TABLETS

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Journal of Innovative Optical Health Sciences 2009年第1期2卷 37-43页

作者： M.JURNA M.WINDBERGS C.J.STRACHAN L.HARTSUIKER C.OTTO P.KLEINEBUDDE J.L.HEREK H.L.OFFERHAUS Optical Sciences Group MESA+Institute for nanotechnology University of Twente The Netherlands Institute of Pharmaceutics and Biopharmaceutics Heinrich-Heine University of Düsseldorf Germany BioPhysical Engineering Group MESA+Institute for nanotechnology University of Twente The Netherlands centre for Drug Research University of Helsinki Finland School of Pharmacy University of Otago New Zealand

Coherent anti-Stokes Raman scattering(CARS)microscopy is used to visualize the release of a model drug(theophylline)from a lipid(tripalmitin)based tablet during *** effects of transformation and dissolution of the drug are imaged in real *** study reveals that the manufacturing process causes significant differences in the release process:tablets prepared from powder show formation of theophylline monohydrate on the surface which prevents a controlled drug release,whereas solid lipid extrudates did not show formation of *** visualization technique can aid future tablet design.

关键词： Drug release coherent anti-Stokes Raman scattering(CARS)microscopy

Can the venerated silk be the next generation nanobiomaterialfor biomedical device designing, regenerative medicine and drugdelivery? Prospects and hitches

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Bio-Design and Manufacturing 2019年第4期2卷 278-286页

作者： Rocktotpal Konwarh Department of Biotechnology Addis Ababa Science and Technology University16417 Akaki KalityAddis AbabaEthiopia centre of Excellence NanotechnologyAddis Ababa Science and Technology University16417 Akaki KalityAddis AbabaEthiopia

Of late, the relevance of silk in a myriad of material science and biotechnological realms has been realized, as attested by the incessantly clambering number of reports and patents in the scienti fic repositories. The write-up is geared off with a scrutiny into the pertinence of the basic nano-structural features of silk, christened as the ‘queen of textile’ for exemplary bioengi- neering applications including designing and fabrication of devices for micro fluidics, opto fluidics, chemo/bio sensing, etc. Then, the major thrust of this short review is directed towards comprehending the prospects of using silk-based biomaterials (e.g. sca ffolds, electrospun membranes, films, hydrogels, bioinks) for tissue engineering and regenerative medicine as well as targeted delivery of various biomolecular cargoes/therapeutic agents, etc., as vouched by few avant-garde endeavours of the recent years. The write-up is entwined with a discussion on the various factors that could plausibly hinder the realization of silk as the next-generation nanobiomaterial, suggestions for some approaches to dodge and deal with the practical snags and what lies ahead!

关键词： Drug delivery Microfluidics Nanobiomaterial Regenerative medicine Silk Tissue engineering

Vapor-phase hydrothermal growth of single crystalline NiS2 nanostructure film on carbon fiber cloth for electrocatalytic oxidation of alcohols to ketones and simultaneous H2 evolution

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Nano Research 2018年第2期11卷 1004-1017页

作者： Wu, Tianxing Zhu, Xiaoguang Wang, Guozhong Zhang, Yunxia Zhang, Haimin Zhao, Huijun Key Laboratory of Materials Physics Centre for Environmental and Energy Nanomaterials Anhui Key Laboratory of Nanomaterials and Nanotechnology CAS Center for Excellence in Nanoscience Institute of Solid State Physics Chinese Academy of Sciences Hefei China centre for Clean Environment and Energy Griffith University Gold Coast Campus Nathan Australia

Electrocatalytic synthesis of value-added chemicals is attracting significant research attention owing to its mild reaction conditions, environmental benignity, and potentially scalable application to organic synthetic chemistry. Herein, we report the preparation of a single-crystalline NiS2 nanostructure film of N 50 nm thickness grown directly on a carbon fiber doth （NiSJCFC） by a facile vapor-phase hydrothermal （VPH） method. NiSJCFC as an electrocatalyst exhibits activity for both the oxygen evolution reaction （OER） and the hydrogen evolution reaction （HER） in alkaline media. Furthermore, a series of alcohols （2-propanol, 2-butanol, 2-pentanol, and cyclohexanol） were electrocatalytically converted to the corresponding ketones with high selectivity, efficienc and durability using the NiSJCFC electrode in alkaline media. In the presence of 0.45 M alcohol, a remarkably decreased overpotential （- 150 mV, vs. RHE） at the NiS2/CFC anode compared with that for water oxidation to generate O2, i.e., the OER, in alkaline media leads to significantly improved H2 generation. For instance, the H2 generation rate in the presence of 0.45 M 2-propanol is almost 1.2-times of that obtained for pure water splitting, but in a system that employs an applied voltage at least 280 mV lower than that required for water splitting to achieve the same current density （20 mA-crn-2）. Thus, our results demonstrate the applicability of our bifunctional non-precious-metal electrocatalyst for organic synthesis and simultaneous H2 production.

关键词： vapor-phase hydrothermal single-crystalline NiS2 film carbon fiber cloth electrocatalytic oxidationof alcohols to ketones H2 generation

A Comparative Investigation on the Structural,Optical and Electrical Properties of SiO_2-Fe_3O_4 Core-Shell Nanostructures with Their Single Components

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Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1317-1325页

作者： Neena Bachan A.Asha W.Jothi Jeyarani D.Arun Kumar J.Merline Shyla Department of Physics Energy NanoTechnology Centre(ENTeC)Loyola Institute of Frontier Energy(LIFE)Loyola College Department of Physics Dhanalakshmi Srinivasan College of Engineering and Technology Department of Physics Shri Andal Alagar College of Engineering

The SiO2-Fe3O4 core-shell nanostructures were synthesized by sol-gel chemistry. The morphological features of the nanostructures were examined by field emission scanning electron microscopy which revealed the core-shell nature of the nanoparticles. X-ray diffraction studies evidenced the formation of SiO2-Fe3O4 core-shell nanostructures with high degree of homogeneity. The elemental composition of the SiO2-Fe3O4 core-shell nanostructures was determined by energy-dispersive X-ray spectroscopy analysis. Fourier transform infrared spectroscopy showed the Si-O-Fe stretching vibrations. On analysis of the optical properties with UV-Vis spectra and Tauc＇s plot, it was found that the band gap of SiO2-Fe3O4 core-shell nanostructures diminished to 1.5 eV. Investigation of the electrical properties of the core-shell nanostructures using field-dependent conductivity measurements presented a significant increase in photoconductivity as compared to those of its single components, thereby rendering them as promising candidates for application as photo- electrodes in dye-sensitized solar cells.

关键词： Nanostructures Sol-gel chemistry Optical properties X-ray diffraction Electricalproperties

Screening hydroxyapatite for cadmium and lead immobilization in aqueous solution and contaminated soil:The role of surface area

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Journal of Environmental Sciences 2017年第2期29卷 141-150页

作者： Hongying Li Xisheng Guo Xinxin Ye Institute of Soil and Fertilizer Anhui Academy of Agricultural Sciences Key Laboratory of Materials Physics Centre for Environmental and Energy Nanomaterials Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences

Hydroxyapatite（HAP） has been widely used to immobilize many cationic metals in water and soils. The specific reason why an increase in the surface area of HAP enhances cadmium（Cd） uptake, but has no effect on lead（Pb） uptake, is not clear. The aim of this study was to determine the factors causing the differences in sorption behavior between Cd and Pb by evaluating HAPs with different surface areas. We synthesized HAPs with two different surface areas, which were characterized by X-ray diffraction, N2 adsorption, and scanning electron microscopy, and then evaluated them as sorbents for Cd and Pb removal by testing in single and binary systems. The sorption capacity of large surface area HAP（1.85 mmol/g） for Cd in the single-metal system was higher than that of small surface area HAP（0.64 mmol/g）, but there were no differences between single- and binary-metal solutions containing Pb. After the Cd experiments, the HAP retained a stable structure and intact morphology, which promotes the accessibility of reactive sites for Cd. However, a newly formed precipitate covered the surface and blocked the channels in the presence of Pb, which reduced the number of potential adsorption sites on HAP for Cd and *** experiments using Cd- and Pb-contaminated soil produced similar results to the solution tests. These results indicate that alterations of the structure and morphology during the reaction is an important factor influencing metal sorption to HAP.

关键词： Hydroxyapatite Cadmium Lead Remediation Structure and morphology

Seaweed-Derived Hierarchically Porous Carbon for Highly Efficient Removal of Tetracycline

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Chinese Journal of Chemical Physics 2022年第3期35卷 578-588,I0003,I0004页

作者： Wen-xiu Qin Na Sun Guo-zhong Wang Hai-min Zhang Yun-xia Zhang Key Laboratory of Materials Physics Centre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyCAS Centre for Excellence in NanoscienceInstitute of Solid State PhysicsChinese Academy of SciencesHefei 230031China School of Chemical and Environmental Engineering Anhui Polytechnic UniversityWuhu 241000China

Herein we present a facile approach for the preparation of a novel hierarchically porous carbon,in which seaweeds serve as carbon source and KOH as *** fabricated KOH-activated seaweed carbon(KSC)displays strong affinity towards tetracycline with maximum uptake quantity of 853.3 mg/g,significantly higher than other tetracycline *** superior adsorption capacity ascribes to large specific surface area(2614 m^(2)/g)and hierarchically porous structure of K-SC,along with strongπ-πinteractions between tetracycline and *** addition,the as-prepared K-SC exhibits fast adsorption kinetics,capable of removing99%of tetracycline in 30 ***,the exhausted K-SC can be regenerated for four cycling adsorption without an obvious degradation in *** importantly,p H and ionic strengths barely affect the adsorption performance of K-SC,implying electrostatic interactions hardly play any role in tetracycline adsorption ***,the K-SC packed fixed-bed column(0.1 g of adsorbents)can continually treat 2780 m L solution spiked with 5.0 mg/g tetracycline before reaching the breakthrough *** in all,the fabricated K-SC equips with high adsorption capacity,fast adsorption rate,glorious anti-interference capability and good reusability,which make it hold great feasibilities for treating tetracycline contamination in real applications.

关键词： Hierarchically porous carbon Tetracycline Adsorption mechanism Fixed-bed column