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Development of high-energy-density materials

Science China(Technological Sciences) 2020年第2期63卷 195-213页

作者： liu JiPing liu lili liu XiaoBo School of Materials Science&Engineering Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

The performance of an energetic compound is mainly decided by parameters such as density, oxygen balance, heat of formation,and stability. Among these properties, density is the most important factor because it determines the detonation pressure and velocity. One of the trends in the development of high-energy-density materials(HEDMs) involves the study of energetic materials with high nitrogen levels. A compound with high nitrogen content can obtain substantial energy from the heat of formation rather than from the intramolecular oxidation of carbon skeleton to release energy in the form of a nitro group or nitrate ester. In addition to excellent performance, the newly developed energetic materials should also possess high working power and insensitivity toward external influences for ensuring the safety of charge and service, high energy release rate, long service life,good compatibility, excellent biological performance, low toxicity, safe battlefield environment, and low moisture absorption,which meet the requirements of military and civilian use. This review summarizes the research progress on global ***, FOX-7, octanitrocubanane, TAM, TKX-50, and N5 were believed to show promise in achieving application goals. The prospective vision of HEDMs containing ions, total nitrogen, metal hydrogen, and nuclear energetic isomers, overcoming technical barriers, synthesis of all-nitrogen materials, theoretical studies on desorption/adsorption system, and challenging technical problems that need to be solved for the safety of synthetic nitrogen compounds were discussed to further elucidate the effect of this subject.

关键词： total nitrogen high-energy-density material energetic ion salt metal hydrogen nuclear energetic isomer

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Essential role of the iron-sulfur cluster binding domain of the primase regulatory subunit Pri2 in DNA replication initiation

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Protein & Cell 2015年第3期6卷 194-210页

作者： lili liu Mingxia Huang Department of Pharmacology and Chemical Biology University of Pittsburgh School of Medicine Pittsburgh PA 15213 USA Department of Biochemistry and Molecular Genetics University of Colorado School of Medicine Aurora CO 80045 USA

DNA primase catalyzes de novo synthesis of a short RNA primer that is further extended by replicative DNA polymerases during initiation of DNA replication. The eukaryotic primase is a heterodimeric enzyme comprising a catalytic subunit Pril and a regulatory subunit Pri2. Pri2 is responsible for facilitating optimal RNA primer synthesis by Pril and mediating interaction between Pril and DNA polymerase o for transition from RNA synthesis to DNA elongation. All eukaryotic Pri2 proteins contain a conserved C-terminal iron-sulfur （Fe-S） cluster-binding domain that is critical for primase catalytic activity in vitro. Here we show that mutations at conserved cysteine ligands for the Pri2 Fe-S cluster markedly decrease the protein stability, thereby causing S phase arrest at the restrictive temperature. Furthermore, Pri2 cysteine mutants are defective in loading of the entire DNA pol α-primase complex onto early replication origins resulting in defective initiation. Importantly, assembly of the Fe-S cluster in Pri2 is impaired not only by mutations at the conserved cysteine ligands but also by increased oxidative stress in the sodlA mutant lacking the Cu/Zn superoxide dismutase. Together these findings highlight the critical role of Pri2＇s Fe-S cluster domain in replication initiation in vivo and suggest a molecular basis for how DNA replication can be influenced by changes in cellular redox state.

关键词： pdmase Pri2 iron-sulfur cluster,replication initiation

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Global stability of an age-structured SVEIR epidemic model with waning immunity, latency and relapse

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International Journal of Biomathematics 2017年第3期10卷 151-178页

作者： lili liu Xianning liu Complex Systems Research Center Shanxi University Taiyuan Shan'xi 030006 P. R. China Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education) School of Mathematics and Statistics Southwest University Chongqing 400715 P. R. China

The global dynamics of an SVEIR epidemic model with age-dependent waning immu- nity, latency and relapse are studied. Sharp threshold properties for global asymptotic stability of both disease-free equilibrium and endemic equilibrium are given. The asymptotic smoothness, uniform persistence and the existence of interior global attractor of the semi-flow generated by a family of solutions of the system are also addressed. Furthermore, some related strategies for controlling the spread of diseases are discussed.

关键词： SVEIR epidemic model waning immunity age-dependent latency age-depen- dent relapse global stability.

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Design and integration of flexible planar micro- supercapacitors

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Nano Research 2017年第5期10卷 1524-1544页

作者： lili liu Zhiqiang Niu Jun Chen Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and Engineering lianjin University at Technology Tianjin 300384 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University Tianjin 300071 China

As promising candidates for energy-storage devices, supercapacitors （SCs） have attracted considerable attention because of their unique features, such as their high power density, outstanding rate capability, excellent cycling performance, and safety. The recent boom in portable electronic devices requires high- performance SCs that are flexible, simplified, thin, and integrated. Tremendous efforts have been directed towards the design and integration of planar micro- SCs （MSCs） based on different active electrode materials by various methods. This review highlights the recent developments in the device design of flexible planar MSCs and their integration with other electronic devices. The current challenges and future prospects for the development of flexible MSCs are also discussed.

关键词： micro-supercapacitor flexible carbon nanotubes graphene integration

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Synthesis, Post-modification and Catalytic Properties of Metal-organic Framework NH2-MIL-53（Al）

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Chemical Research in Chinese Universities 2017年第2期33卷 231-238页

作者： liu lili TAI Xishi ZHOU Xiaojing liu Lijuan School of Chemistry & Chemical Engineering and Environmental Engineering Weifang University Weifang 261061 P. R. China

A postsynthetic modification method was used to prepare salicylaldehyde functionalized metal-organicframeworks through the nucleophilic addition of salicylaldehyde with the amine group present in the frameworks ofNH2-MIL-53（A1）. Hydroxyl groups were successfully grafted onto NI-I2-MIL-53（A1）, and imine groups were ***, these hydroxyl and imine groups of the resulting NH2-MIL-53（A1）-SA can be used as the anchoringgroup to stabilise Au^3＋ ions and Au^0 nanoparticles（NPs）. By doing this, Au^3＋ ions and Au^0 NPs were successfully en-capsulated in the cages of NH2-MIL-53（A1） by a simple impregnation method. The resulting gold functionalizedNH2-MIL-53（AI） showed good catalytic activities in the one-pot synthesis of structurally divergent propargylaminesby three-component coupling reactions of aldehydes, amines and alkynes. Various aromatic/aliphatic aldehydes, aro-matic alkynes, and piperidine were able to undergo three-component coupling on NH2-MIL-53（A1）-Au. In addition,the catalyst NH2-M/L-53（A/）-Au was recovered easily by centrifugation and reused up to four times. Thus, it can beused for the environmentally friendly synthesis ofpropargylamines.

关键词： Metal-organic framework Postmodification NH2-MIL-53(AI) Three-component coupling Propargyl-amine

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Flexible supercapacitors based on carbon nanotubes

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Chinese Chemical Letters 2018年第4期29卷 571-581页

作者： lili liu Zhiqiang Niu Jun Chen Tianjin Key Laboratory for Photoelectric Materials and Devices National Demonstration Center for Experimental Function Materials Education School of Materials Science and Engineering Tianjin University of Technology Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of Chemistry Nankai University

Since carbon nanotubes（CNTs） possess unique one dimensional（1D） structure, considerable attention has been paid to constructing CNTs into macroscopic materials with different dimensions, including 1D fibers,2D films, and 3D foams. Such macroscopic CNT materials exhibit high conductivity, large surface area, as well as good mechanical properties, and thus can be directly used as the flexible supercapacitor（SC） electrodes or the scaffolds for supporting pseudo-capacitive electrode materials. Based on these macroscopic CNT electrodes, diverse SCs with different structures, including flexible, stretchable and/or compressible fiber and thin film SCs, have been designed. This review provides an overview of recent progress towards the development of flexible SCs based on macroscopic CNTs-based electrodes, with a focus on electrode preparation and configuration design as well as their integration with other multifunctional *** development and prospects in the CNTs-based flexible SCs are also discussed.

关键词： Carbon nanotubes Flexible supercapacitors Macroscopic materials Pseudo-capacitive materials Integration

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Defects in Graphene:Generation,Healing,and Their Effects on the Properties of Graphene:A Review

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Journal of Materials Science & Technology 2015年第6期31卷 599-606页

作者： lili liu Miaoqing Qing Yibo Wang Shimou Chen Department of Chemistry School of ScienceBeijing Technology and Business University Key Laboratory of Green Process and Engineering Institute of Process Engineering(IPE)Chinese Academy of Sciences(CAS)

Graphene has attracted immense investigation since its *** imperfections are introduced into graphene unavoidably during graphene growth or *** structural defects are known to significantly affect electronic and chemical properties of graphene.A comprehensive understanding of graphene defect is thus of critical *** we review the major progresses made in defectrelated engineering of ***,we give a brief introduction on the types of defects in ***,the generation and healing of the graphene defects are ***,the effects of defects on the chemical,electronic,magnetic,and mechanical properties of graphene are ***,we address the associated challenges and prospects on the future study of defects in graphene and other nanocarbon materials.

关键词： Graphene Vacancy Defect healing Band gap modulatio

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An immune system based differential evolution algorithm using near-neighbor effect in dynamic environments

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Control Theory and Technology 2012年第4期10卷 417-425页

作者： lili liu Dingwei WANG Jiafu TANG PetroChina Northeast Refining & Chemicals Engineering Company Limited School of Information Science and Engineering Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University

Many real-world problems are dynamic,requiring optimization algorithms being able to continuously track changing optima(optimum) over *** paper proposes an improved differential evolutionary algorithm using the notion of the near-neighbor effect to determine one individuals neighborhoods,for tracking multiple optima in the dynamic environment.A new mutation strategy using the near-neighbor effect is also *** creates individuals by utilizing the stored memory point in its neighborhood,and utilizing the differential vector produced by the ’nearneighbor -superior’ and ’near-neighbor-inferior’.Taking inspirations from the biological immune system,an immune system based scheme is presented for rapidly detecting and responding to the environmental *** addition,a differencerelated multidirectional amplification scheme is presented to integrate valuable information from different dimensions for effectively and rapidly finding the promising optimum in the search *** on dynamic scenarios created by the typical dynamic test instance—moving peak problem,have demonstrated that the near-neighbor and immune system based differential evolution algorithm(NIDE) is effective in dealing with dynamic optimization functions.

关键词： Differential evolution Immune system based scheme Near-neighbor effect Difference-related multidirectional amplification Dynamic optimization problem.

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Fast nanoparticle sizing by image dynamic light scattering

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Particuology 2015年第2期13卷 82-85页

作者： Chengze Xu Xiaoshu Cai Jie Zhang lili liu Institute of Particle and Two-Phase Flow Measurement University of Shanghai for Science and Technology

In this paper, an image dynamic light scattering method for nanoparticle sizing is introduced. The spatial distribution of the scattered lights from nanoparticles undergoing Brownian motion was captured at a high frame rate by a digital camera within one second, which is considerably faster than the conven- tional photon correlation spectroscopy method. The captured series of photographs were meshed into thousands of small units for calculating the intensity autocorrelation functions in parallel. Experimental results from the measurements of three reference nanoparticle samples （27, 80, and 352 nm in diameters） demonstrated the feasibility of this method.

关键词： Nanoparticle sizing Image dynamic light scattering Real-time acquisition Brownian motion

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Photocatalytic degradation of Rhodamine B under visible light with Nd-doped titanium dioxide films

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Journal of Rare Earths 2009年第5期27卷 739-743页

作者： WU Xiaohong SU Peibo liu Huiling QI lili State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Department of Applied ChemistryHarbin Institute of Technology Harbin 150001 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150001 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150001 China

Microporous titanium dioxide films were prepared by the sol-gel methods on glass substrates, using tetrabutyl titanate as source material. In order to absorb the visible light and increase the photocatalytic activities, different concentrations of neodymium ions (Nd/Ti molar ratio was 0.5%, 0.7%, 0.9%, and 1.1% respectively) were added into the sol. X-ray diffraction (XRD), X-ray photoelectron spectros-copy (XPS), and atom force microscopy (AFM) were applied to characterize the modified films. A kind of typical textile industry pollutant (Rhodamine B) was used to evaluate the photocatalytic activities of the films under visible light. The results showed that the activities of the films were improved by doping Nd ions into the sol.

关键词： titanium dioxide visible light doping ion photocatalysis Rhodamine B rare earths

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