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Integrating Au and ZnO nanoparticles onto graphene nanosheet for enhanced sonodynamic therapy

Nano Research 2022年第10期15卷 9223-9233页

作者： Fei wang Boyu wang Wei you Guang Chen Ye-Zi you Neurosurgical Department the First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Department of Polymer Science and Engineering University of Science and Technology of ChinaHefei 230026China

Sonodynamic therapy has attracted widespread attention for cancer treatment because of its noninvasiveness and high tissuepenetration ability.Generally,ultrasound irradiation of sonosensitizers produces separated electrons(e−)and holes(h+),which inhibits cancer by producing reactive oxygen species(ROS).However,the separated electrons(e−)and holes(h+)could easily recombine,lowering the yield of ROS and hindering the application of sonodynamic therapy(SDT).Herein,we present a highly efficient sonosensitizer system for enhanced sonodynamic therapy built on reduced graphene oxide(rGO)nanosheets,bridged ZnO and Au nanoparticles,coated with polyvinyl pyrrolidone(PVP).The ultrasound irradiation activates ZnO nanoparticles to generate separated electron–hole(e−–h+)pairs,and the rGO nanosheets facilitate electron transfer from ZnO to Au nanoparticles because of the narrow band gap of rGO,which could efficiently restrain the recombination of the e−–h+pairs,thereby significantly augmenting the production of ROS to kill cancer cells,such as U373MG,HeLa,and CT26 cells.Moreover,rGO nanosheets integrated with Au nanoparticles could catalyze the endogenous decomposition of H_(2)O_(2) into O_(2),which can alleviate hypoxic tumor microenvironment(TME).Therefore,the rational design of Au-rGO-ZnO@PVP nanomaterials can not only improve the efficiency of sonodynamic therapy,but also mitigate the hypoxic tumor microenvironment,which would provide a new perspective in the development of efficient sonosensitizers.

关键词： sonodynamic therapy reactive oxygen species reduced graphene oxide tumor

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A Generic Dynamic Load Model Framework

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 399-406页

作者： you Lin Jianhui wang the Department of Electrical and Computer Engineering Southern Methodist UniversityDallasUSA

Formulating accurate dynamic load models is critical for power system analysis,control,and planning.In this paper,a generic dynamic load model is proposed.The dynamic power response of the load is directly approximated as the superposition of various mathematical functions that produce a dynamic response.Basic physical principles of the dynamic process are reflected in the mathematical functions utilized in the proposed model.First,different stages of the dynamic process are detected based on the continuity of derivatives of the measurement.Second,a complete set of mathematical functions that produce the dynamic responses in electric devices are formulated.Third,a parsimonious set of mathematical functions is selected at each stage by performing feature selection using nonlinear principal component analysis.The proposed model is further formulated based on the parsimonious set of mathematical functions at each stage.Finally,the parameters of the proposed model corresponding to different system events are solved.Based on the formulated model,its possible application in event detection is further analyzed.The proposed model is easy to implement given limited data measurement.Various tests on different system event data are performed to validate the effectiveness of the proposed model.The results show that the proposed model has excellent accuracy and robustness for different system events.

关键词： Approximation dynamic process generic framework load model physical principle.

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Global Smooth Solution to the Incompressible Navier-Stokes-Landau-Lifshitz Equations

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Acta Mathematicae Applicatae Sinica 2023年第1期39卷 135-178页

作者： Guang-wu wang you-de wang School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006China Hua Loo-Keng Key Laboratory of Mathematics Institute of MathematicsAMSS and School of Mathematical ScienceUCASBeijing 100190China

In this paper, we will investigate the incompressible Navier-Stokes-Landau-Lifshitz equations, which is a system of the incompressible Navier-Stokes equations coupled with the Landau-Lifshitz-Gilbert equations. We will prove global existence of the smooth solution to the incompressible Navier-Stokes-Landau-Lifshitz equation with small initial data in T2or R2and R3.

关键词： incompressible Navier-Stokes-Landau-Lifshitz equations global smooth solution small initial data

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A new 3D plastoelastohydrodynamic lubrication model for rough surfaces

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Friction 2024年第6期12卷 1176-1193页

作者： Shengyu you Jinyuan TANG Qiang wang State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China

Plastoelastohydrodynamic lubrication of rough surfaces(R-PEHL)is a cutting-edge area of research in interface fluid-structure coupling analysis.The existing R-PEHL model calculates the elastic-plastic deformation of rough surface by the Love equation in a semi-infinite space smooth surface,which deviates from the actual surface.Therefore,it is an innovative work to study the exact solution of elastic-plastic deformation of rough surface and its influence on the solution results of R-PEHL model.In this paper,a new contact calculation model of plastoelastohydrodynamic lubrication(PEHL)with three-dimensional(3D)rough surface is proposed by integrating numerical method of EHL and finite element method.The new model eliminates an original error introduced by the assumption of semi-infinite space in contact calculation,providing wide applicability and high accuracy.Under the given rough surfaces and working conditions,the study reveals that:(1)the oil film pressure calculated by the new model is lower than that of the smooth surface in semi-infinite space by 200–800 MPa;(2)the Mises stress of the new model is 2.5%–26.6%higher than that of the smooth surface in semi-infinite space;(3)compared with the semi-infinite space assumption,the rough surface plastic deformation of the new model is increased by 71%–173%,and the local plastic deformation singularity may appear under the semi-infinite space assumption;(4)the plastic deformation caused by the first contact cycle on the rough surface of the new model accounts for 66.7%–92.9%of the total plastic deformation,and the plastic deformation of the semi-infinite space accounts for 50%–83.3%.This study resolves the contradiction between the smooth surface assumption and the rough surface in the existing R-PEHL model,establishing a solid logic foundation for the accurate solution of R-PEHL model.

关键词： rough surface plastoelastohydrodynamic lubrication(PEHL) asperity plastic deformation semi-infinite space

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Recent progress in porous organic polymers and their application for CO_(2) capture

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Chinese Journal of Chemical Engineering 2022年第2期35卷 91-103页

作者： Jiajia wang Lizhi wang you wang Du Zhang Qin Xiao Jianhan Huang you-Nian Liu College of Chemistry and Chemical Engineering Hunan Provincial Key Laboratory of Micro and Nano Material Interface ScienceCentral South UniversityChangsha 410083China

Carbon capture,storage,and utilization(CCSU)is recognized as an effective method to reduce the excessive emission of CO_(2).Absorption by amine aqueous solutions is considered highly efficient for CO_(2) capture from the flue gas because of the large CO_(2) capture capacity and high selectivity.However,it is often limited by the equipment corrosion and the high desorption energy consumption,and adsorption of CO_(2) using solid adsorbents has been receiving more attention in recent years due to its simplicity and high efficiency.More recently,a great number of porous organic polymers(POPs)have been designed and constructed for CO_(2) capture,and they are proven promising solid adsorbents for CO_(2) capture due to their high Brunauer-Emmett-Teller(BET)surface area(SBET),adjustable pore size and easy functionalization.In particular,they usually have rigid skeleton,permanent porosity,and good physiochemical stability.In this review,we have a detailed review for the different POPs developed in recent years,not only the design strategy,but also the special structure for CO_(2) capture.The outlook of the opportunities and challenges of the POPs is also proposed.

关键词： Porous organic polymers Selectivity Adsorbent CO_(2)capture

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Lignin-based polymer with high phenolic hydroxyl group content prepared by the alkyl chain bridging method and applied as a dopant of PEDOT

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Frontiers of Chemical Science and Engineering 2023年第8期17卷 1075-1084页

作者： Nanlong Hong Jiahui wang Jinhua you School of Chemical Engineering and Energy Technology Dongguan University of TechnologyDongguan 523808China

Inspired by the importance of the phenolic group to the electron transporting property of hole transport materials,phenolic hydroxyl groups were introduced in lignosulfonate(LS)via the alkyl chain bridging method to prepare phenolated-lignosulfonate(PLS).The results showed that the phenolic group was boosted from 0.81 mmol∙g^(–1) of LS to 1.19 mmol∙g^(–1) of PLS.The electrochemical property results showed two oxidation peaks in the cyclic voltammogram(CV)curve of PLS,and the oxidation potential of the PLS-modified electrode decreased by 0.5 eV compared with that of LS.This result indicates that PLS is more easily oxidized than LS.Based on the excellent electron transporting property of PLS,PLS was applied as a dopant in poly(3,4-ethylenedioxythiophene)(PEDOT,called PEDOT:PLSs).PLS showed excellent dispersion properties for PEDOT.Moreover,the transmittance measurement results showed that the transmittance of PEDOT:PLSs exceeded 85%in the range of 300–800 nm.The CV results showed that the energy levels of PEDOT:PLSs could be flexibly adjusted by PLS amounts.The results indicate that the phenolic hydroxyl group of lignin can be easily boosted by the alkyl chain bridging method,and phenolated lignin-based polymers may have promising potential as dopants of PEDOT to produce hole transporting materials for different organic photovoltaic devices.

关键词： lignosulfonate phenolic group PEDOT:PLS hole extract layer energy level

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The escape mechanisms of the proto-atmosphere on terrestrial planets:"boil-off" escape,hydrodynamic escape and impact erosion

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Acta Geochimica 2022年第4期41卷 592-606页

作者： Ziqi wang you Zhou Yun Liu State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550081China International Research Center for Planetary Science College of Earth SciencesChengdu University of TechnologyChengdu610059China CAS Center for Excellence in Comparative Planetology Hefei230026China

Atmospheric escape is an essential process that affects the evolution of the proto-atmosphere.The atmospheric escape of early terrestrial planets was extremely rapid compared with the current scenarios,and the main atmospheric escape modes were also quite different.During the dissipation of the nebula disk,the primordial atmosphere experienced a brief but violent"boiling"escape,in which most of the primordial atmosphere was lost.After the nebula disk dissipates,hydrodynamic escape and impact erosion are the two most important mass-loss mechanisms for the proto-atmosphere.Hydrodynamic escape is a rapid atmospheric escape process caused by strong solar radiation,while impact erosion refers to the process in which small-large or giant impacts erode the proto-atmosphere.In the early solar system,there were other escape mechanisms,such as non-thermodynamic escape and Jeans escape,but it is generally believed that these mechanisms have relatively little impact.Here we systematically introduce the above-mentioned atmospheric escape mechanisms and then make some suggestions for the existing problems and future research for atmospheric escape models.

关键词： Proto-atmosphere Primordial atmosphere "Boil-off" Hydrodynamic escape Impact erosion

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Computation of Minimal Siphons in Petri Nets Using Problem Partitioning Approaches

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IEEE/CAA Journal of Automatica Sinica 2022年第2期9卷 329-338页

作者： Dan you Oussama Karoui Shouguang wang IEEE School of Information and Electronic Engineering(Sussex Artificial Intelligence Institute) Zhejiang Gongshang UniversityHangzhou 310018China

A large amount of research has shown the vitality of siphon enumeration in the analysis and control of deadlocks in various resource-allocation systems modeled by Petri nets(PNs).In this paper,we propose an algorithm for the enumeration of minimal siphons in PN based on problem decomposition.The proposed algorithm is an improved version of the global partitioning minimal-siphon enumeration(GPMSE)proposed by Cordone et al.(2005)in IEEE Transactions on Systems,Man,and Cybernetics-Part A:Systems and Humans,which is widely used in the literature to compute minimal siphons.The experimental results show that the proposed algorithm consumes lower computational time and memory compared with GPMSE,which becomes more evident when the size of the handled net grows.

关键词： Index Terms-Petri nets(PNs) problem decomposition resource-allocation systems siphons

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Mitsunobu Functionalization of Poly(vinyl alcohol) Derivatives

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Chinese Journal of Chemistry 2023年第6期41卷 637-643页

作者： Yin Zhang Yu wang Wei you Beijing National Laboratory for Molecular Sciences(BNLMS) CAS Key Laboratory of Engineering PlasticsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Bejing 100049China

Polymer functionalization is a powerful tool to prepare polymers with diverse structures without the need of synthesizing monomers or performing polymerization reactions.Polymers that are difficult to be synthesized using direct polymerization reactions can be accessed using polymer functionalization.We herein present Mitsunobu derivatization of poly(vinyl alcohol)(PVA)to convert the hydroxyl groups into diverse functional groups.

关键词： Polymer functionalization Poly(vinyl alcohol) Mitsunobu reactions UV-shielding Acetalation

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Sustainable Polyamides Enabled by Controlled Ring-opening Polymerization of 4-Hydroxyproline-derived Lactams

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Chinese Journal of Polymer Science 2023年第5期41卷 728-734,I0008页

作者： Jian-Qun wang Xian-Hong wang you-Hua Tao Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China

Aliphatic polyamides have been considered as eco-friendly materials,useful for a wide range of applications.However,it still presents obstacle to produce sustainable aliphatic polyamides from abundant renewable sources.Herein,we describe that 4-hydroxyproline(4-HYP),a renewable resource,was readily converted to its corresponding bicyclic bridged lactam monomers bearing pendant Boc-protected secondary amino group,and oligo-ethylene glycol group.Lithium hexamethyldisilazide(LiHMDS)-mediated polymerization of the resulting monomers exhibited a controlled feature,affording sustainable aliphatic polyamides with number-average molecular weight up to 73 kg/mol and a low molecular weight distribution?<1.28.Overall,this work can lead to a novel kind of functional and sustainable polyamides with potential applications,including degradable plastics,and drug delivery.

关键词： Polyamides Renewable Ring-opening polymerization 4-Hydroxyproline

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