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Numerical study on heat and mass transfer mechanisms of janus particle sedimentation considering corrosion

Particuology 2023年第12期83卷 71-90页

作者： Zhiguo Xu Zelin Zhao School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China

janus particle is a research hotspot due to its novelty and settlement in acid liquid during wastewater *** and mass transfer mechanisms of janus particle sedimentation considering corrosion are numerically investigated based on immersed boundary lattice Boltzmann *** reaction heat ratio,Damkohler number,Peclet number,and particle number effects on temperature field,concentration field,janus particle mass reduction,position,and velocity are *** uniform particle has an equilibrium position of about 1/4 times the channel width for two corroded uniform particle settlement *** janus particle horizontal position deviates from the uniform particle equilibrium position due to the force caused by nonuniform buoyancy and particle *** the chemical reaction heat ratio is more than 1,the janus particle horizontal position is closer to the channel centerline and has a positive ***,the converse trend happens when the chemical reaction heat ratio is less than 1,and the janus particle horizontal position has a negative *** janus particle horizontal position deviation magnitude increases with increasing Damkohler number and decreasing Peclet *** horizontal position deviation phenomenon exists for the single corroded janus particle and two corroded janus particle settlement processes.

关键词： janus particle Corrosion Equilibrium position Chemical reaction heat ratio Temperature

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Mitochondria-targeted janus mesoporous nanoplatform for tumor photodynamic therapy

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Chinese Chemical Letters 2024年第2期35卷 544-547页

作者： Min Dong Rui Tang Jing Li Jiajia Zhao Yu Wang Lin Ouyang Wei Lu Jun Tao Meng Dang Yuxia Tang Zhaogang Teng Key Laboratory for Organic Electronics & Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced MaterialsJiangsu National Synergetic Innovation Centre for Advanced MaterialsNanjing University of Post and TelecommunicationsNanjing 210023China Laboratory of Molecular Imaging Department of RadiologyThe First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029China Department of Radiology The 909th HospitalSoutheast HospitalSchool of MedicineXiamen UniversityZhangzhou 363000China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInstitute of Functional MaterialsDonghua UniversityShanghai 201620China

Photodynamic therapy(PDT)is an effective treatment method for *** the specifically accumulated of photosensitizer was very difficult in the tumor site,which greatly limited the efficacy of ***,mitochondria-targeted janus mesoporous nanoplatform(JPMO-Pt-CTPP-ZnPc)for PDT was prepared,the nanoplatform has uniform size(275 nm)and good dispersion and *** confocal laser scanning microscopy(CLSM)revealed the signal of ZnPc of JPMO-Pt-CTPP-ZnPc were higher than JPMO-Pt-ZnPc in tumor cells,and flow cytometry results showed the cell uptake efficiency of JPMO-Pt-CTPP-ZnPc was 2.5-fold higher than that of *** revealed the modification of CTPP significantly improves the targeting ability of the *** vitro anti-tumor experiment showed the JPMO-Pt-CTPP-ZnPc significantly inhibited the growth of tumor cells upon the irradiation of low-power laser,and the survival rate of cells incubated with 60μg/mL JPMO-Pt-CTPP-ZnPc was only 3%.Simultaneously,compared with JPMO-Pt-ZnPc(not modified with mitochondria targeting molecules CTPP),the PDT efficacy of JPMO-Pt-CTPP-ZnPc was significantly better,as it has targeted mitochondria in cells.

关键词： Mesoporous materials janus particle Photodynamic therapy Mitochondria targeting Tumor treatment

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Collective diffusion in a two-dimensional liquid composed of janus particles

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Communications in Theoretical Physics 2022年第10期74卷 150-156页

作者： Tao Huang Chunhua Zeng Yong Chen Faculty of Civil Engineering and Mechanics/Faculty of Science Kunming University of Science and TechnologyKunming 650500China School of Physics Beihang UniversityBeijing 100191China

The collective diffusion of anisotropic particles in liquids plays a crucial role in many processes,such as *** patchy particle,which is usually nearly spherical in shape,is an important anisotropic particle with different properties from other anisotropic particles like the ellipsoid liquid crystal *** the present study,molecular dynamics simulations are performed to study the collective diffusion of a two-dimensional anisotropic liquid system composed of janus *** static structures and diffusion behaviours of anisotropic and isotropic Lennard-Jones liquids are *** long-time diffusion behaviour of an anisotropic liquid of nearly spherical janus particles is found to be similar to that of an isotropic liquid because the orientation of the particles disappears over long-term *** anisotropic properties of the janus particles are mainly reflected in the spatial correlation of particle orientations and mid-time diffusion *** difference between nearly spherical anisotropic particles and rod-like particles is also discussed in this paper.

关键词： janus particle anisotropic particle collective diffusion

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Magnetic field-mediated janus particles with sustained driving capability for severe bleeding control in perforating and inflected wounds

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Bioactive Materials 2021年第12期6卷 4625-4639页

作者： Qing Li Enling Hu Kun Yu Mengxing Lu Ruiqi Xie Fei Lu Bitao Lu Rong Bao Guangqian Lan State Key Laboratory of Silkworm Genome Biology College of SericultureTextile and Biomass SciencesSouthwest UniversityChongqing400715China Chongqing Engineering Research Center of Biomaterial Fiber and Modern Textile Chongqing400715China The Ninth People’s Hospital of Chongqing No.69 Jialing VillageBeiBei DistrictChongqing400715China

Severe bleeding in perforating and inflected wounds with forky cavities or fine voids encountered during prehospital treatments and surgical procedures is a complex ***,we present a novel hemostatic strategy based on magnetic field-mediated *** biphasic janus magnetic particle(MSS@Fe2O3-T)comprised aggregates ofα-Fe2O3 nanoparticles(Fe_(2)O_(3) NPs)as the motion actuator,negatively modified microporous starch(MSS)as the base hemostatic substrate,and thrombin as the loaded hemostatic *** application,the particles were first wrapped using NaHCO_(3) and then doped with protonated tranexamic acid(TXA-NH_(3)^(+)),which ensured their high self-dispersibility in *** application,the particles promptly self-diffused in blood by bubble propulsion and travelled to deep bleeding sites against reverse rushing blood flow under magnetic *** vivo tests confirmed the superior hemostatic performance of the particles in perforating and inflected wounds(“V”-shaped femoral artery and“J”-shaped liver bleeding models).The present strategy,for the first time,extends the range of magnetically guided drug carriers to address the challenges in the hemorrhage control of perforating and inflected wounds.

关键词： janus particle Sustained driving Magnetic guidance Hemostasis Complex wound

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Flow-pattern-altered syntheses of core–shell and hole–shell microparticles in an axisymmetric microfluidic device

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Acta Mechanica Sinica 2021年第9期37卷 1378-1386,I0001页

作者： Duo Wang Xu Zheng Xiaodong Chen Guoqing Hu State Key Laboratory of Fluid Power and Mechatronic Systems Department of Engineering MechanicsZhejiang UniversityHangzhou310027China State Key Laboratory of Nonlinear Mechanics(LNM) Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China

Droplet-based microfluidics offers unique advantages to create platforms that fabricate functionalized particles with increased accessibility,robustness,and *** we present a three-phase microfluidic device that can control the flow pattern to directly generate either core–shell or hole–shell *** major benefits of this device are the ease of controlling the morphology of the compound droplets by the flow rates and thus the microstructure of the synthesized *** transition between flow patterns enables the generation of either core–shell particles or janus particles in a single *** further show the versatility of the proposed device in fabrication of functionalized particles:the hole size of the hole–shell microparticle can be fine-tuned while its outer diameter is kept constant,and by adding Fe_(3)O_(4) nanoparticles into the photocurable phase,the obtained magnetoresponsive microparticle can move rotationally or translationally under an external magnetic *** anticipate that the present method could facilitate the fabrication of the functional microparticles for diverse applications.

关键词： Microfluidics Droplet Microparticle janus particle

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