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Enhanced Roles of Carbon Architectures in High-Performance Lithium-Ion Batteries

Nano-Micro Letters 2019年第1期11卷 78-100页

作者： Lu Wang Junwei Han Debin Kong Ying Tao QuanHong Yang Nanoyang group State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology

Lithium?ion batteries(LIBs), which are high?energy?density and low?safety?risk secondary batteries, are underpinned to the rise in electrochemical energy storage devices that satisfy the urgent demands of the global energy storage market. With the aim of achiev?ing high energy density and fast?charging performance, the exploitation of simple and low?cost approaches for the production of high capacity, high density, high mass loading, and kinetically ion?accessible electrodes that maximize charge storage and transport in LIBs, is a critical need. Toward the construction of high?performance electrodes, carbons are promisingly used in the enhanced roles of active materials, electrochemi?cal reaction frameworks for high?capacity noncarbons, and lightweight current collectors. Here, we review recent advances in the carbon engi?neering of electrodes for excellent electrochemical performance and structural stability, which is enabled by assembled carbon architectures that guarantee su cient charge delivery and volume fluctuation bu ering inside the electrode during cycling. Some specific feasible assem?bly methods, synergism between structural design components of carbon assemblies, and electrochemical performance enhancement are highlighted. The precise design of carbon cages by the assembly of graphene units is potentially useful for the controlled preparation of high?capacity carbon?caged noncarbon anodes with volumetric capacities over 2100 mAh cm^(-3). Finally, insights are given on the prospects and challenges for designing carbon architectures for practical LIBs that simultaneously provide high energy densities(both gravimetric and volumetric) and high rate performance.

关键词： Lithium-ion battery Carbon architecture Energy density Power density Assembly

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Host-guest supramolecular chemistry at solid-liquid interface:An important strategy for preparing two-dimensional functional nanostructures

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Science China Chemistry 2014年第1期57卷 13-25页

作者： ZHANG XueMei ZENG QingDao WANG Chen National Center for nanoscience and Technology (NCNST)

Supramolecular self-assembly,an important strategy in nanotechnology,has been widely studied in the past two *** this review,we have introduced the recent progress on construction of two-dimensional(2D)nanostructures by host-guest supramolecular chemistry at solid-liquid interface,and the interactions between the host assembly and the guest molecules are the major *** first,the hydrogen bonds connected hybrid structures are *** then we have paid a close attention on the surface-confined condensation reactions that has flourished recently in direct preparing novel nanostructures with increasing structural *** the end,the cavity confinement of the 2D supramolecular host-guest architectures has been *** the basis of the above-mentioned interactions,a group of functional hybrid structures have been ***,scanning tunneling microscopy(STM),a unique technique to probe the surface morphology and information at the single molecule level,has been used to probe the formed structures on highly oriented pyrolytic graphite(HOPG)surface.

关键词： self-assembly,STM,hydrogen bond,host-guest chemistry,supramocular coordination,Schiff-base reaction

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Construction of two-dimensional(2D) H-bonded supramolecular nanostructures studied by STM

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Chinese Chemical Letters 2013年第3期24卷 177-182页

作者： Jing Xu Qing-Dao Zeng National Center for nanoscience and Technology(NCNST)

In this review, a group ot two-dimensional （2D） hydrogen-bonded supramolecular networks developed in our laboratory are discussed. Our attention is mainly focused on：（1） recognition of Fe3＋ through twocomponent molecular networks; （2） site-selective fabrication of 2D fullerene arrays; and （3） fabrication of the nanoporous structure regulated by photoisomerization reaction process. It is envisioned that special supramolecular nanostructures, through H-bonding interactions, can be constructed or reconstructed to be further investigated toward the research of multi-component systems, molecule recognition, single molecular switches, and host-guest supramolecular chemistry.

关键词： Scanning tunneling microscopy (STM)Self-assemblySupramolecular networkHydrogen bonds

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Chemical resistance tests on PP-ternary nanocomposite for its application in bioreactor liner fabrication

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Science China(Technological Sciences) 2011年第8期54卷 2217-2223页

作者： FARIDA Yusof SALAWUDEEN T.Olalekan QASIM H.Shah MA'AN F.Alkhatib SULEYMAN A.Muyibi nanoscience & Nanotechnology Research group Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia Department of Mechanical Engineering International Islamic University Malaysia

Continuous usage of bioreactor causes early degradation of most bioreactor liner materials due to the effects of various chemicals, consequently resulting in contamination in the bioprocess. Performance of PP-ternary nanocomposite (PPTN) for its potential application in the fabrication of bioreactor liner material was investigated in this study. The chemical resistance of the composite samples obtained was tested by exposing them to chemicals such as acid, alkaline, water and bacterial solutions, according to ASTM 543-06, and their effects on the composite samples were carefully observed. Specifically, the investigation focused on the changes in the physico-mechanical properties of PPTN following long term of exposure to these chemicals. The results show slight increase in the weight and dimensions of samples in the first few days, followed by constant reading for the period of 4 weeks. The performance in terms of physical properties was in the range of PPTN with 0.61% MWCNT > PPTN 0.45% > PPTN 0.17%. The maximum percentage change in tensile properties, observed in this study, was approximately 10% against PPTN (0.17%), which indicates stable mechanical properties of the composite and invariably suggests that the nanocomposites could serve as a better alternative for bioreactor liner fabrication.

关键词： bioreactor chemical resistance liner material MWCNT melt intercalation polypropylene ternary nanocomposite

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STM Manipulation of Molecular Moulds on Metal Surfaces

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Nano Research 2009年第3期2卷 254-259页

作者： Miao Yu Wei Xu Youness Benjalal Regis Barattin Erik Lægsgaard Ivan Stensgaard Mohamed Hliwa Xavier Bouju AndréGourdon Christian Joachim Trolle R.Linderoth Flemming Besenbacher Interdisciplinary nanoscience Center(iNANO)and Department of Physics and Astronomy Aarhus UniversityNy Munkegade8000 Aarhus CDenmark nanoscience group CEMES-CNRS29 rue Jeanne Marvig31055 ToulouseFrance Facultédes Sciences Ben MʼSik UniversitéHassan II-MohammédiaBP 7955Sidi OthmanCasablancaMorocco

Molecular Landers are a class of compounds containing an aromatic board as well as bulky side groups which upon adsorption of the molecule on a surface may lift the molecular board away from the *** molecular Landers have extensively been studied as model systems for nanomachines and the formation of molecular wires,as well as for their function as“molecular moulds”,i.e.,acting as templates by accommodating metal atoms underneath their aromatic ***,we investigate the adsorption of a novel Lander molecule 1,4-bis(4-(2,4-diaminotriazine)phenyl)-2,3,5,6-tetrakis(4-tert-butylphenyl)benzene(DAT,C_(64)H_(68)N_(10))on Cu(110)and Au(111)surfaces under ultrahigh vacuum(UHV)*** means of scanning tunneling microscopy(STM)imaging and manipulation,we characterize the morphology and binding geometries of DAT molecules at terraces and step *** the Cu(110)surface,various contact configurations of individual DAT Landers were formed at the step edges in a controlled manner,steered by STM manipulation,including lateral translation,rotation,and pushing molecules to an upper *** diffusion barrier of single DAT molecules on Au(111)is considerably smaller than on Cu(110).The DAT Lander is specially designed with diamino-triazine side groups making it suitable for future studies of molecular self-assembly by hydrogen-bonding *** results presented here are an important guide to the choice of substrate for future studies using this compound.

关键词： Scanning tunneling microscopy(STM) molecular Landers adsorption STM manipulation molecular moulding

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Recent Advances in Single-Atom Electrocatalysts for Oxygen Reduction Reaction

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Research 2020年第1期2020卷 1847-1897页

作者： Junxing Han Juanjuan Bian Chunwen Sun CAS Center for Excellence in nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China

Oxygen reduction reaction(ORR)plays significant roles in electrochemical energy storage and conversion systems as well as clean synthesis of fine ***,the ORR process shows sluggish kinetics and requires platinum-group noble metal catalysts to accelerate the *** high cost,rare reservation,and unsatisfied durability significantly impede large-scale commercialization of platinum-based ***-atom electrocatalysts(SAECs)featuring with well-defined structure,high intrinsic activity,and maximum atom efficiency have emerged as a novel field in electrocatalytic science since it is promising to substitute expensive platinum-group noble metal ***,finely fabricating SAECs with uniform and highly dense active sites,fully maximizing the utilization efficiency of active sites,and maintaining the atomically isolated sites as single-atom centers under harsh electrocatalytic conditions remain urgent *** this review,we summarized recent advances of SAECs in synthesis,characterization,oxygen reduction reaction(ORR)performance,and applications in ORR-related H_(2)O_(2)production,metal-air batteries,and low-temperature fuel *** progress on tailoring the coordination structure of isolated metal centers by doping other metals or ligands,enriching the concentration of single-atom sites by increasing metal loadings,and engineering the porosity and electronic structure of the support by optimizing the mass and electron transport are also ***,general strategies to synthesize SAECs with high metal loadings on practical scale are highlighted,the deep learning algorithm for rational design of SAECs is introduced,and theoretical understanding of active-site structures of SAECs is discussed as *** on future directions and remaining challenges of SAECs are presented.

关键词： platinum Oxygen centers

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Preparation of nanocrystalline γ-Al_2O_3 catalyst using different procedures for methanol dehydration to dimethyl ether

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Journal of Natural Gas Chemistry 2011年第3期20卷 334-338页

作者： Ahmad Reza Keshavarz Mehran Rezaei Fereydoon Yaripour Catalyst and Advanced Materials Research Laboratory Chemical Engineering Department Faculty of Engineering University of Kashan Institute of nanoscience and Nanotechnology University of Kashan Catalyst Research group Petrochemical Research & Technology Company National Petrochemical Company (NPC)

A series of nanocrystalline γ-alumina are synthesized by different procedures, namely, thermal decomposition method （sample A）, precipita-tion method （sample B） and sol-gel method using sucrose and hexadecyltrimethyl ammonium bromide （CTAB） as templates （samples C and D, respectively）. Textural and acidic properties of γ-alumina samples are characterized by XRD, N2 adsorption-desorption and NH3-TPD techniques. Vapor-phase dehydration of methanol into dimethyl ether is carried out over these samples. Among them, sample C shows the highest catalytic activity. NH3-TPD analysis reveals that the sample with smaller crystallite size possesses higher concentration of medium acidic sites and consequently higher catalytic activity. Thermal decomposition method leads to decrease in both surface area and moderate acidity, therefore it is the cause of lower catalytic activity.

关键词： methanol dehydration dimethyl ether gama alumina sol-gel

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Alginate and alginate composites for biomedical applications

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Asian Journal of Pharmaceutical Sciences 2021年第3期16卷 280-306页

作者： Raha Ahmad Raus Wan Mohd Fazli Wan Nawawi Ricca Rahman Nasaruddin Department of Biotechnology Engineering International Islamic University MalaysiaKuala Lumpur 50728Malaysia nanoscience and Nanotechnology Research group(NanoRG) International Islamic University MalaysiaKuala Lumpur 50728Malaysia

Alginate is an edible heteropolysaccharide that abundantly available in the brown seaweed and the capsule of bacteria such as Azotobacter *** Pseudomonas *** to alginate gel forming capability,it is widely used in food,textile and paper industries;and to a lesser extent in biomedical applications as biomaterial to promote wound healing and tissue *** is evident from the rising use of alginate-based dressing for heavily exuding wound and their mass availability in the market ***,alginate also has *** in contact with physiological environment,alginate could gelate into softer structure,consequently limits its potential in the soft tissue regeneration and becomes inappropriate for the usage related to load bearing body *** cater this problem,wide range of materials have been added to alginate structure,producing sturdy composite *** instance,the incorporation of adhesive peptide and natural polymer or synthetic polymer to alginate moieties creates an improved composite material,which not only possesses better mechanical properties compared to native alginate,but also grants additional healing capability and promote better tissue *** addition,drug release kinetic and cell viability can be further improved when alginate composite is used as encapsulating *** this review,preparation of alginate and alginate composite in various forms(fibre,bead,hydrogel,and 3D-printed matrices)used for biomedical application is described first,followed by the discussion of latest trend related to alginate composite utilization in wound dressing,drug delivery,and tissue engineering applications.

关键词： Alginate Alginate composite Tissue engineering Wound dressing Drug delivery

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Ferroelectric,dielectric,and optical properties of Nd-substituted Bi4Ti3O12 nanoparticles synthesized by sol-gel method

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Progress in Natural Science:Materials International 2016年第6期26卷 528-532页

作者： A.Marikani V.Selvamurugan G.Mangamma S.Ravi R.Krishnasharma P.V.Chandrasekar M.Kamruddin D.Madhavan Department of Physics Mepco Schlenk Engineering College Surface & nanoscience Division Materials Science GroupIndira Gandhi Centre for Atomic Research(IGCAR) Institute of Optoelectronic Technology Fuzhou University Department of Chemistry Mepco Schlenk Engineering College

This paper reports the synthesis of neodymium substituted bismuth titanate nanoparticles（BNdT） for ferroelectric random access memory（Fe RAM） based applications using sol-gel route. X-ray diffraction pattern showed that the BNdT nanoparticles exhibited perovskite structure with orthorhombic phase. The microstructure of the BNdT nanoparticles showed that the grains were in spherical structure with a bi-modal distribution of spheres. Dielectric constant and dielectric loss of BNdT nanoparticles were measured in the frequency range 100 Hz to 100 kHz. Nd-substituted BNdT nanoparticles showed the high remanent polarization（Pr=33.2 μC/cm2, Ec=62.5 kV/cm） than pure bismuth titanate（BT）(Pr=14.6 μC/cm2, Ec=182.8 kV/cm) ideal for FeRAM based applications. The occurrence of red shift in photoluminescence（PL） spectrum is considered to be due to the isomerisation that may occur from the heating of samples.

关键词： Nanostructures Sol-gel method X-ray diffraction Dielectric properties Photoluminescence Ferroelectric materials

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Non-invasive assessment for intratumoural distribution of interstitial fluid flow

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Magnetic Resonance Letters 2023年第4期3卷 286-297页

作者： Jun Zhao Yupeng Cao Wentao Liu Dong Han CAS Center for Excellence in nanoscience National Center for Nanoscience and TechnologyBeijing100190China School of Future Technology University of Chinese Academy of SciencesBeijing100049China

Interstitial fluid plays a vital role in drug delivery and tumour ***,few non-invasive measurement methods are available for measuring low-velocity biological fluid ***,this study aimed to develop a novel technology called interstitial flow *** interstitial flow velocity-MRI sequence consists of a dual inversion recovery preparation and an improved stimulated echo sequence(ISTE)combined with phase-contrast MRI.A homemade flow phantom was used to assess the feasibility and sensitivity of interstitial flow *** addition,xenografts of female BALB/c mouse models of 4T1 breast cancer administered losartan(40 mg/kg)or saline(n?6)were subjected to imaging on a 7.0 T scanner to assess the in vivo interstitial fluid flow *** results showed a significant correlation(Pgroup had a lower mean interstitial fluid velocity than the control group(85±16 vs 113±24 mm/s).In addition,compared to the saline treatment,losartan treatment reduced the proportion of collagen fibres by 10%and 12%in the Masson and Sirius red staining groups,*** flow velocity-MRI has the potential to determine interstitial fluid flow velocity non-invasively and exhibits an intuitive velocity map.

关键词： Interstitial fluid flow Interstitial flow velocity-MRI Losartan Slow flows Tumour microenvironment

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