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Nitrogen-doped graphene nanosheets as reactive water purification membranes

Nano Research 2016年第7期9卷 1983-1993页

作者： Yanbiao Liu Ling Yu Choon Nam Ong jianping xie NUS Environmental Research Institute National University of Singapore 117411 Singapore Department of Chemical and Biomolecular Engineering National University of Singapore 117585 Singapore

Oxidation of organic pollutants by sulfate radicals produced via activation of persulfate has emerged as a promising advanced oxidation technology to address various challenging environmental issues. The development of an effective, environmentally-friendly, metal-free catalyst is the key to this technology. Additionally, a supported catalyst design is more advantageous than conventional suspended powder catalysts from the point of view of mass transfer and practical engineering applications （e.g. post-use separation）. In this study, a metal-free N-doped reduced graphene oxide （N-rGO） catalyst was prepared via a facile hydrothermal method. N-rGO filters were then synthesized by facile vacuum filtration, such that water can flow through nanochannels within the filters. Various advanced characterization techniques were employed to obtain structural and compositional information of the as-synthesized N-rGO filters. An optimized phenol oxidative flux of 0.036 ＋_ 0.002 mmol.h ~ was obtained by metal-flee catalytic activation of persulfate at an influent persulfate concentration of 1.0 mmol-L 1 and filter weight of 15 rag, while a N-free rGO filter demonstrated negligible phenol oxidation capability under similar conditions. Compared to a conventional batch system, the flow-through design demonstrates obviously enhanced oxidation kinetics （0.036 vs. 0.010 retool-h-I）, mainly due to the liquid flow through the filter leading to convection-enhanced transfer of the target molecule to the filter active sites. Overall, the results exemplified the advantages of organic compound removal by catalytic activation of persulfate using a metal-free catalyst in flow- through mode, and demonstrated the potential of N-rGO filters for practical environmental applications.

关键词： persulfate activation nitrogen-doped graphene phenol oxidation convective flow batch system

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Aggregation-induced emission in luminescent metal nanoclusters

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National Science Review 2021年第6期8卷 18-20页

作者： Zhennan Wu Qiaofeng Yao Shuang-quan Zang jianping xie Department of Chemical and Biomolecular Engineering National University of Singapore Green Catalysis Center and College of ChemistryZhengzhou University Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University

Few-to hundred-atom luminescent metal nanoclusters(NCs) protected by an organic monolayer have recently emerged as a novel class of chromophores, with facile preparation,ultrafine size, low toxicity, high renal clearance and excellent photostability[1]. Luminescent metal NCs hold great promise for broad applications in lighting, imaging, sensing and therapeutics [2]; however,

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Nanostructured LiMn2O4 and their composites as high-performance cathodes for lithium-ion batteries

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Progress in Natural Science:Materials International 2012年第6期22卷 572-584页

作者： Hui Xia Zhentao Luo jianping xie School of Materials Science and Engineering Nanjing University of Science and TechnologyXiaolingwei 200 Department of Chemical and Biomolecular Engineering.National University of Singapore.9 Engineering Drive I

Improvement of the energy density and power density of the lithium-ion batteries is urgently required with the rapid development of electric vehicles and portable electronic devices. The spinel LiMn2O4is one of the most promising cathode materials due to its low cost,nontoxicity, and improved safety compared with commercial *** nanostructured electrode materials represents one of the most attractive strategies to dramatically enhance battery performance,such as capacity,rate capability and cycling ***,extensive efforts have been devoted to developing nanostructured LiMn2O4and LiMn2O4/carbon nanocomposites to further improve the rate capability of lithium-ion batteries for high-power *** this paper,recent progress in developing nanostructured LiMn2O4and LiMn2O4/carbon nanocomposites is reviewed,and the benefits to the electrochemical performance of LiMn2O4-based cathodes by using these electrode materials are also discussed.

关键词： Lithium manganese oxide Cathode Lithium-ion batteries Nanostructure Nanocomposite

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Genes and regulatory networks involved in persistence of Mycobacterium tuberculosis

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Science China(Life Sciences) 2011年第4期54卷 300-310页

作者： WANG XiaoZhen WANG HongHai xie jianping Institute of Modern Biopharmaceuticals State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area School of Life Sciences Southwest University Chongqing 400715 China State Key Laboratory of Genetic Engineering Institute of Genetics School of Life Science Fudan University Shanghai 200433 China

The causative agent of tuberculosis,Mycobacterium tuberculosis,is one of the most successful of human *** can evade the host immune response and establish a persistent infection or enter a dormant state within the host which can be reactivated if the host becomes *** of these features are major obstacles to tuberculosis *** and reactivation of *** are tightly coordinated dynamic processes involving numerous genes and their *** mechanisms underlying *** persistence may provide an opportunity for the discovery of effective drug targets for tuberculosis ***,we review the genes required for *** persistence and propose a regulatory network for the action of these genes using text *** should provide fresh insights into the persistence mechanisms of *** and suggest candidates for new drug targets and immune intervention.

关键词： Mycobacterium tuberculosis persistent infection dormancy network

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Composition-dependent catalytic performance of Au_(x)Ag_(25-x) alloy nanoclusters for oxygen reduction reaction

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Nano Research 2024年第11期17卷 9490-9497页

作者： Chuan Mu Biao Wang Qiaofeng Yao Qian He jianping xie Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Fuzhou 350207 China Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 Singapore 117585 Singapore School of Physical Science and Technology Southwest University Chongqing 400715 China Key Laboratory of Organic Integrated Circuits Ministry of Education and Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University Tianjin 3700072 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore

Oxygen reduction reaction(ORR)occurs at the cathode of electrochemical devices like fuel cells and in the Huron-Dow process,reducing oxygen to water or hydrogen *** the past years,various electrocatalysts with enhanced activity,selectivity,and durability have been developed for ***,an atomic-level understanding of how materials composition affects electrocatalytic performance has not yet been achieved,which prevents us from designing efficient catalysts based on the requirements of practical *** is partially because of the polydispersity of traditional catalysts and their unknown structure dynamics in the electrocatalytic *** we establish a full-spectrum of atomically precise and robust Au_(x)Ag_(25-x)(MHA)18(x=0–25,and MHA=6-mercaptohexanoic acid)nanoclusters(NCs)and systematically investigate their composition-dependent catalytic performance for ORR at the atomic *** results show that,with the increasing number of Au atoms in Au_(x)Ag_(25-x)(MHA)18 NCs,the electron transfer number gradually decreases from 3.9 for Ag25(MHA)18 to 2.1 for Au25(MHA)18,indicating that the dominant oxygen reduction product alters from water to hydrogen *** functional theory simulations reveal that the Gibbs free energy of OOH adsorption(ΔGOOH*)on Au25 is closest to the idealΔGOOH*of 4.22 eV to produce H_(2)O_(2),while Ag alloying makes theΔGOOH*deviate from the optimal value and leads to the production of *** study suggests that alloy NCs are promising paradigms for unveiling composition-dependent electrocatalytic performance of metal nanoparticles at the atomic level.

关键词： metal nanoclusters synthesis electrocatalysis structure-property relationship

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Observing antimicrobial process with traceable gold nanodusters

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Nano Research 2021年第4期14卷 1026-1033页

作者： Kaiyuan Zheng Magdiel I.Setyawati David Tai Leong jianping xie Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4Singapore 117585Singapore School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Understanding the interaction of nanomaterials with biological systems has always been of high concern and *** emerging type of nanomaterials,ultrasmall metal nanoclusters(NCs,<2 nm in size),are promising in this aspect due to their well-defined molecular formulae and structures,as well as unique physical and chemical properties that are distinctly different from their larger counterparts(metal nanoparticles).For example,metal NCs possess intrinsic strong luminescence,which can be used for real-time tracking of their interactions with biological ***,luminescent gold(Au)NCs were used as traceable antimicrobial agents to study their interactions with the bacteria and tofurther understand their underlining antimicrobial *** is shown for the first time that the Au NCs would first attach on the bacterial membrane,penetrate,and subsequently accumulate inside the ***,the internalized Au NCs would induce reactive oxygen species(ROS)generation and damage the bacterial membrane,resulting in the leakage of bacterial contents,which can finally kill the *** Au NCs(or other metal NCs)provide a promising platform to study the antimicrobial mechanisms as well as other fundamentals on the interfacing of functional nanomaterials with the biological systems,further increasing their acceptance in various biomedical applications.

关键词： metal nanoclusters gold nancx^lusters antimicrobial agents luminescent probes bioimaging

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Luminescent metal nanoclusters:Biosensing strategies and bioimaging applications

Aggregate

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Aggregate 2021年第1期2卷 114-132页

作者： Yan Xiao ZhennanWu Qiaofeng Yao jianping xie Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4SingaporeSingapore College of Chemistry and Chemical Engineering Hubei UniversityWuhanHubeiChina Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New CityFuzhouChina

Metal nanoclusters(MNCs)are ultrasmall metal-organic aggregates,composed of a metal core less than 2 nm and a protecting shell of metal-organic ligand *** controlled aggregation of metal atoms(in the cluster core)and metal-organic ligand motifs(around the cluster core)renders MNCs with numerous molecule-like properties,among which strong and bright luminescence has attracted extensive basic and applied *** has now known that aggregation-induced emission is a feasible mechanism for controlling luminescence of MNCs,which makes it particularly useful in biosensing and bioimaging *** the luminescence fundamentals and design principles largely determine the practicality and effectiveness of MNCs in biosensing and bioimaging applications,a systematic summary of this topic is lacking in the current *** this review,we aim to provide a concise discussion of the latest developments in biosensing and bioimaging applications of luminescent MNCs,highlighting their luminescence mechanisms,biosensing principles,and bioimaging ***,we first introduce the recent advances in the synthetic chemistry of MNCs,and then briefly discuss the luminescence fundamentals *** the design strategy and practicality of luminescent MNCs in biosensing and bioimaging applications are *** conclude the review with our perspectives on the further development of MNC-based optical probes in biosensing and bioimaging *** review is expected to provide guidance for the future practice of designing and synthesizing luminescent MNCs for biomedical and other applications.

关键词： aggregation-induced emission bioimaging biosensor luminescence metal nanoclusters

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A streamlined high throughput screening method for the Mycobacterium neoaurum mutants with expected yield of biotransformation derivatives from sterols

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Chinese Chemical Letters 2018年第8期29卷 1251-1253页

作者： Chaoxiong Wu Junqi Xu jianping xie Zhenyu Wang College of Biomedical Engineering Chongqing Medical University Institute of Modern Biopharmaceuticals School of Life Sciences Southwest University

Steroidal drugs have wide indications such as anti-inflammation, anti-tumor, endocrine regulation,fertility management. Phytosterol is the main starting materials for the industrial synthesis of steroid drugs. Microbial transformation of phytosterol is a simple and environmentally friendly process. Efficient microbial strains for industrial phytosterol transformation are critical for the commercial success. To this end, a 96-well plate based method was developed to discriminate the mixture of 4-androstene-3,17-dione, androsta-1,4-diene-3,17-dione, and bisnoraldehyde, with different ratio of the 3 components in the mixture, which mimics the sterol bioconversion products by using the Mycobacterium neoaurum. The M. neoaurum bioconversed broth test using phytosterol as substrate also found that the spectrum methodology can evaluate the relative content of different compounds. The method is practical, high throughput and can replace the conventional HPLC-based assay for rapid selection of desired microbial strains.

关键词： Mycobacterium neoaurum Sterol Biotransformation Mutants 4-Androstene-3,17-dione (AD) Androsta-1,4-diene-3,17-dione (ADD)

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Synthesis,upconversion luminescence and optical heating of hexagonal NaGdF_4:Yb^(3+),Er^(3+)

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Journal of Rare Earths 2018年第11期36卷 1136-1140页

作者： Tao Pang Wenbo Peng Ming Yang jianping xie Wenhui Lu College of Science Huzhou University

An optical heater based on hexagonal NaGdF^4＋Yb^3＋/Er^3＋ is reported. XRD, SEM and EDS characterization results show that F /Ln^3＋ can not only control the phase composition, particle size and morphology, but also affect the effective doping concentration of Yb^3＋ and Er^3＋. When F /Ln^3＋ is 12/1, the strongest upconversion luminescence is obtained. Based on the luminescent temperature sensing behavior of Er^3＋, the photo-thermal conversion performance was investigated. The results indicate that the temperature of irradiation spot is linearly dependent on the power density, and the photo-thermal responsivity is determined to be 3.3 K-cm2/W. Also, it is found that the photo-thermal conversion efficiency can be regulated by changing the Yb3~ doping concentration. Compared with the nano-gold, copper sulfide and carbon nanotubes, the NaGdF4：Yb^3＋/Er^3＋has the triple functions of upconversion luminescence, temperature sensing, and photo-thermal conversion, and may therefore be a promising optical heater for photo-thermal therapy of tumors.

关键词： Hycirothermal synthesis Upconversion Temperature sensing Optical heater NaGdF4 Rare earths

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A perspective of chalcogenide semiconductor-noble metal nanocomposites through structural transformations

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Nano Materials Science 2019年第3期1卷 184-197页

作者： Danye Liu Linlin Xu jianping xie Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences No.19A Yuquan RoadBeijing100049China Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4117585Singapore Center for Mesoscience Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Zhongke Langfang Institute of Process Engineering Fenghua Road No 1Langfang Economic&Technical Development ZoneHebei Province065001China

Intense efforts have been devoted to the synthesis of heterogeneous nanocomposites consisting of chalcogenide semiconductors and noble metals,which usually exhibit enhanced properties owing to the synergistic effect between their different material *** the structure of the metal domains in the nanocomposites may lead to further improvements of its performance for a given *** review therefore highlights the strategies based on a structural conversion process for the fabrication of nanocomposites consisting of chalcogenide semiconductors and noble metals with various internal structures,e.g.,hollow or *** strategy relies on a unique inside-out diffusion phenomenon of Ag in core-shell nanoparticles with Ag residing at core or inner shell *** the presence of sulfur or selenium precursors,the diffused Ag are converted into Ag2S or Ag2Se,which is connected with the remaining noble metal parts,forming nanocomposites consisting of silver chalcogenide and noble metal nanoparticles with hollow or cage-bell *** would focus on the introduction of the fundamentals,principles,electrocatalytic applications as well as perspectives of the chalcogenide semiconductor-noble metal nanocomposites derived from their core-shell precursors so as to provide the readers insights in designing efficient nanocomposites for electrocatalysis.

关键词： Nanocomposite Chalcogenide Noble metal Nanoparticle Structural conversion Electrocatalysis

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