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Ultralight and superelastic MXene/reduced graphene oxide aerogels for electromagnetic interference shielding

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Nano Research 2025年第1期18卷 1-9页

作者： Xinfeng Zhou Yang Dai Guoyao Yue Yiman Zhang Lulu Li Zhong-zhen Yu peng Min Hao-Bin Zhang 21 State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Present address:BOE Technology Innovation Center BOE Technology Group Co.Ltd.Beijing 100176China Xi’an Modern Chemistry Research Institute Xi’an 710065China

Lightweight aerogels feature multifunctionality and a high porosity,yet accompanied with poor structure recovery under large strain *** this work,we develop an air bubble-ice crystal dual template and annealing strategy to integrate low density and high resilience for the conductive transition metal carbides/nitrides(MXene)composite *** air bubbles and ice crystals synergistically exclude the nanosheets to the gas-liquid interfaces,thereby constructing unique Y-shaped junctions and robust *** annealing process greatly enhances the interlayer *** external load,the Yshaped structures prevent the stress concentration at the junctions by transferring the forces to the skeleton for maintaining structural *** addition,the wrinkled and thick cell walls,together with the enhanced interlayer interactions,endow the aerogel with exceptional structural stability and *** a result,the MXene/reduced graphene oxide(RGO)composite aerogels exhibit superelasticity with reversible compressive strains of up to 95%.In addition,the electron bridging effect of the RGO sheets affords the aerogel to deliver excellent electromagnetic interference shielding performance,as high as 46.3 dB at 2.5 ***,the remarkable reshapeability of the aerogels allows for precise regulation of structure and performance(33.5-75.1 dB)by a simple wetting compression *** summary,this work offers helpful inspirations for developing lightweight and superelasticity aerogels for extensive applications.

关键词： lightweight superelasticity MXene aerogel electromagnetic interference shielding reshapeability

Synthesis of cyclicβ-silylenones via oxidative rearrangement of tertiaryα-hydroxy allylsilanes with PCC

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Chinese Chemical Letters 2011年第3期22卷 306-309页

作者： Xia Wu Jian lei zhen lei Song Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry West China School of Pharmacy Sichuan University Chengdu 610041 China

An oxidative rearrangement of cyclic tertiary a-hydroxy allylsilanes has been carried out in refluxing ClCH_2CH_2Cl with pyridinium chlorochromate（PCC）.The reaction provides a convenient method to synthesize cyclic... 详细信息

关键词： Pyridinium chlorochromate Oxidative rearrangement Cyclicβ-silylenones

Infrared Photodetectors and Image Arrays Made with Organic Semiconductors

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Chinese Journal of Polymer Science 2023年第10期41卷 1629-1637页

作者： Zhi-Ming Zhong Feng peng lei Ying zhen-Qiang Huang Wen-Kai Zhong Gang Yu Yong Cao Fei Huang Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou510640China

Combining the strategies of introducing larger heteroatom,regio-regular backbone and extended branching position of side-chain,we developed polymer semiconductors(PPCPD)with narrow band-gap to construct the photosensing layer of thin-film photodiodes and image *** spectral response of the resulting organic photodiodes spans from the near ultra-violet to short-wavelength infrared *** performance of these short-wavelength infrared photodiodes in 900–1200 nm range achieved a level competitive with that of indium gallium arsenide-based inorganic crystalline detectors,exhibiting a specific detectivity of 5.55×1012 Jones at 1.15µ*** photodetectivity and quantum efficiency in photodiode with amorphous/nanocrystalline thin-films of 100–200 nm thickness enabled high pixel-density image arrays without pixel-level-patterning in the sensing layer.1×256 linear diode arrays with 25µm×25µm pixel pitch were achieved,enabling high pixel-density short-wavelength infrared imaging at room temperature.

关键词： Conjugated polymer Organic semiconductor Infrared Photodetector Image array

Synthesis strategies for disulfide bond-containing polymer- based drug delivery system for reduction-responsive controlled release

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Frontiers of Materials Science 2015年第3期9卷 211-226页

作者： lei LIU peng LIU State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China

Tumor micro-environment responsive drug delivery systems （DDSs） have been developed as a potential approach to reduce the side effects of cancer chemotherapy. Glutathione （GSH） has been supposed to the most significant signal of the difference between the normal tissue and the tumor cells, besides the media pH and temperature. In recent years, the reduction-responsive DDSs have attracted more and more attention for delivery of anti-cancer drugs, based on such physiological signal. Among them, disulfide bond-containing polymers have been designed as the main tool for the purpose. The recent progress in the synthesis strategies for the disulfide bond- containing polymer-based DDS is focused in the present review.

关键词： drug delivery system (DDS) reduction-responsive disulfide bond-containing polymer tumor micro-environment responsive

Targeting H3K36 methyltransferases NSDs:a promising strategy for tumor targeted therapy

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Signal Transduction and Targeted Therapy 2021年第7期6卷 1933-1934页

作者： Xuerun peng Qian peng lei Zhong Personalized Drug Therapy Key Laboratory of Sichuan Province Department of PharmacySichuan Provincial People's HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengduSichuanChina Radiation Oncology Key Laboratory of Sichuan Province Sichuan Cancer Hospital&InstituteSichuan Cancer CenterSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengduChina

Recently,two studies published in Nature identified genetic changes in the nuclear receptor-binding SET domain protein(NSD)family of histone methyltransferases as oncogenic drivers in some malignancies,and revealed th... 详细信息

关键词： methyltransferase targeted therapy

Phonon-phonon interaction and parametric down-conversion generation in multimode optomechanical systems

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Communications in Theoretical Physics 2023年第3期75卷 20-28页

作者： zhen-Yang peng Ying-Dan Wang CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

We studied the process of polariton conversion in a 3-mode nonlinear optomechanical *** with the standard 2-mode optomechanical system,we find a much larger conversion rate of polariton modes can be achieved under typical dissipation *** obtain a transparent understanding of the relevant physical process,we show that in the large detuned case,the cavity can be eliminated adiabatically,resulting in a parametric down-conversion(PDC)interaction between two phononic polariton *** tuning cavity detuning,the nonlinear interaction can be enhanced with the frequency-matching *** from analytical treatment based on the effective PDC model agree with the numerical *** a system provides potential applications in nonlinear phononics.

关键词： nonlinear optomechanical system parametric down-conversion adiabatic elimination

Numerical simulation of fueling pellet ablation and transport in the EAST H-mode discharge

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Chinese Physics B 2022年第7期31卷 420-427页

作者： Wan-Ting Chen Ji-Zhong Sun Fang Gao lei peng De-zhen Wang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China

To understand the effect of injected deuterium(D)pellets on background plasma,the ablation of D pellets and the transport of D species in both atomic and ionic states in the EAST device are simulated using a modified dynamic neutral gas shield model combined with the edge plasma code *** simulation results show that there is a phenomenon of obvious atomic deposition in the scrape-off layer(SOL)after pellet injection,which depends strongly on the injection *** increasing injection velocity,the atomic density in the SOL decreases evidently and the deposition time is relatively *** effects for triggering of edge localized modes(ELMs)by D and Li pellets are also *** the same pellet size and injection velocity,the maximum perturbation pressure caused by D pellets is obviously *** is found that the resulting maximum perturbed pressure is remarkably enhanced when the injection velocity is reduced from 300 m/s to 100 m/s for a pellet with a cross section of 1.6 mm,which indicates that the injection velocity is important for ELM *** work can provide reasonable guidance for choosing pellet parameters for fueling and ELM triggering.

关键词： deuterium pellet fueling EAST SOLPS-ITER

Uncertainty evaluation and correlation analysis of single-particle energies in phenomenological nuclear mean field:an investigation into propagating uncertainties for independent model parameters

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Nuclear Science and Techniques 2021年第2期32卷 45-57页

作者： zhen-zhen Zhang Hua-lei Wang Hai-Yan Meng Min-Liang Liu School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

Based on the Monte Carlo approach and conventional error analysis theory,taking the heaviest doubly magic nucleus 208Pb as an example,we first evaluate the propagated uncertainties of universal potential parameters for three typical types of single-particle energy in the phenomenological Woods–Saxon mean *** the Woods–Saxon modeling with uncorrelated model parameters,we found that the standard deviations of singleparticle energy obtained through the Monte Carlo simulation and the error propagation rules are in good *** seems that the energy uncertainty of the single-particle levels regularly evoluate with certain quantum numbers to a large extent for the given parameter ***,the correlation properties of the single-particle levels within the domain of input parameter uncertainties are statistically analyzed,for example,with the aid of Pearson’s correlation *** was found that a positive,negative,or unrelated relationship may appear between two selected single-particle levels,which will be extremely helpful for evaluating the theoretical uncertainty related to the single-particle levels(e.g.,K isomer)in nuclear structural calculations.

关键词： Uncertainty propagation Correlation effect Woods-Saxon potential

Modeling structured peer-to-peer systems

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 76-80页

作者： HAN Li lei zhen-ming Information Engineer Institute Beijing University of Posts and Telecommunications Beijing 100876 China

Distributed network architecture and dynamic change of nodes makes the operation of structured peer-to-peer networks unpredictable. This article aims to present a research on the running rule of structured peer-to-peer networks through a mathematical model. The proposed model provides a low-complexity means to estimate the performance of a structured peer-to-peer network from two aspects： the average existent time of a node and probability of returning to a temporarily steady state of network. On the basis of the results, it can be concluded that the proposed structured peer-to-peer network is suitable for those conditions where the frequency of node change is under limited value, and this value mainly depends on the initializing time of the node. Otherwise, structured peer-to-peer network can be abstracted as a network queuing system, which is composed of many node queuing systems in a meshy way and the relation between the throughput of the node system and network system is analyzed.

关键词： peer-to-peer network distributed hash table bith and death Markov model average existent time temporarily steady state