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Structures and Surface States of Polymer Brushes in Good Solvents:Effects of Surface Interactions

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Chinese Journal of Polymer Science 2018年第9期36卷 1047-1054页

作者： yi-xin liu Hong-Dong Zhang State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University

The influence of the surface interaction on the mesoscopic structure of grafted polymers in good solvents has been examined. At high surface coverage, tethered polymers are in the brush state and the parabolic segment density profile is confirmed by self-consistent field theory （SCFT） calculations. It is found that this is a universal behavior for a whole range of surface interactions from complete repulsion to strong attraction. More interestingly, finite surface repulsion may lead to the maximum in the proximal layer of its segment density profile, which is significantly different from both the depletion layer of pure repulsion and the adsorbing layer of attraction. In addition to the brush state on both repulsive and attractive surfaces, three additional surface states were identified by analyzing the scaling behavior of the layer thickness of polymer brushes： the mushroom state on repulsive substrates, the dilute and the semidilute surface states on attractive substrates.

关键词： Self-consistent field theory Scaling theory Polymer thin film Polymer brush

Astrocyte polarization in glaucoma: a new opportunity

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Neural Regeneration Research 2022年第12期17卷 2582-2588页

作者： yi-xin liu Hao Sun Wen-yi Guo Department of Ophthalmology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology ShanghaiChina

Astrocyte polarization is a new concept which is similar to microglia polarization and in which astrocytes are classified as A1(neurotoxic)and A2(neuroprotective).Several studies on astrocyte polarization have focused mainly on neurodegenerative diseases,trauma,and ***,the role of astrocyte polarization in glaucoma,a neurodegenerative disease,has not been fully *** this review,we first describe the characteristics of astrocyte astrogliosis in glaucoma,including morphological,molecular,proliferative and functional *** then summarize understanding of astrocyte polarization in other diseases,and show that A1 astrocytes are involved in the death of retinal ganglion cells in glaucoma,and that their neurotoxins kill only damaged retinal ganglion *** on this,we propose new interesting conjecture on astrocyte polarization in glaucoma:(1)That the neurotoxin from A1 astrocytes is a product of the complement system(membrane-attacking complex),since this system is known to mediate synaptic elimination and the C3 expression is clearly increased in A1 astrocytes;(2)that reactive scar-forming astrocytes in the optic nerve head may be classified as A2 astrocytes since their ablation leads to a worse prognosis in ***,current therapeutic research progress on astrocyte polarization in other diseases is also *** of astrocyte polarization can be achieved by extracellular microglia-related and intracellular *** A1 or increased A2 astrocytes can rescue the *** example,glucagon-like peptide-1 receptor agonist rescues retinal ganglion cells by reducing A1 astrocytes via the extracellular microglia-related pathway in an ocular hypertension model,suggesting that regulation of astrocyte polarization as a therapeutic target in glaucoma is feasible.

关键词： astrocytes glaucoma heterogeneity microglia neurodegenerative disease neuroinflammation neuroprotection optic nerve retina therapy

Automated Identification of Ordered Phases for Simulation Studies of Block Copolymers

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Chinese Journal of Polymer Science 2024年第5期42卷 683-692,I0011页

作者： Yu-Chen Zhang Wei-Ling Huang yi-xin liu State Key Laboratory of Molecule Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China

In unit cell simulations,identification of ordered phases in block copolymers(BCPs)is a tedious and time-consuming task,impeding the advancement of more streamlined and potentially automated research *** this study,we propose a scattering-based automated identification strategy(SAIS)for characterization and identification of ordered phases of BCPs based on their computed scattering *** approach leverages the scattering theory of perfect crystals to efficiently compute the scattering patterns of periodic morphologies in a unit *** the first stage of the SAIS,phases are identified by comparing reflection conditions at a sequence of Miller *** confirm or refine the identification results of the first stage,the second stage of the SAIS introduces a tailored residual between the test phase and each of the known candidate ***,our strategy incorporates a variance-like criterion to distinguish background species,enabling its extension to multi-species BCP *** has been demonstrated that our strategy achieves exceptional accuracy and robustness while requiring minimal computational ***,the approach allows for real-time expansion and improvement to the candidate phase library,facilitating the development of automated research workflows for designing specific ordered structures and discovering new ordered phases in BCPs.

关键词： Block copolymer Phase identification Scattering function

An Efficient Algorithm for Self-consistent Field Theory Calculations of Complex Self-assembled Structures of Block Copolymer Melts

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Chinese Journal of Polymer Science 2018年第4期36卷 488-496页

作者： Jun-Qing Song yi-xin liu Hong-Dong Zhang State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University

Self-consistent field theory（SCFT）, as a state-of-the-art technique for studying the self-assembly of block copolymers, is attracting continuous efforts to improve its accuracy and efficiency. Here we present a fourth-order exponential time differencing Runge-Kutta algorithm（ETDRK4） to solve the modified diffusion equation（MDE） which is the most time-consuming part of a SCFT calculation. By making a careful comparison with currently most efficient and popular algorithms, we demonstrate that the ETDRK4 algorithm significantly reduces the number of chain contour steps in solving the MDE, resulting in a boost of the overall computation efficiency, while it shares the same spatial accuracy with other algorithms. In addition, to demonstrate the power of our ETDRK4 algorithm, we apply it to compute the phase boundaries of the bicontinuous gyroid phase in the strong segregation regime and to verify the existence of the triple point of the O70 phase, the lamellar phase and the cylindrical phase.

关键词： Block copolymer Self-consistent field theory Algorithm Pseudo-spectral Phase structure

Effect of chemical reactivity on the detonation initiation in shock accelerated flow in a confined space

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Acta Mechanica Sinica 2013年第1期29卷 54-61页

作者： Yue-Jin Zhu Gang Dong yi-xin liu Bao-Chun Fan Hua Jiang State Key Laboratory of Transient Physics Nanjing University of Science and Technology State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

The interactions of a spherical flame with an incident shock wave and its reflected shock wave in a confined space were investigated using the three-dimensional reactive Navier-Stokes equations, with emphasis placed on the effect of chemical reactivity of mixture on the flame distortion and detonation initiation after the passage of the reflected shock wave. It is shown that the spatio-temporal characteristics of detonation initiation depend highly on the chemi- cal reactivity of the mixture. When the chemical reactivity enhances, the flame can be severely distorted to form a reactive shock bifurcation structure with detonations initiating at different three-dimensional spatial locations. Moreover, the detonation initiation would occur earlier in a mixture of more enhanced reactivity. The results reveal that the detona- tions arise from hot spots in the unburned region which are initiated by the shock-detonation-transition mechanism.

关键词： Chemical reactivity Reactive shock bifurcation structure ~ Detonation initiation Hot spot Shock wave

Metal-organic frameworks as photocatalysts for aerobic oxidation reactions

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Science China Chemistry 2023年第6期66卷 1634-1653页

作者： Kun Wu xin-yi liu Pei-Wen Cheng Mo Xie Weigang Lu Dan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China

Metal-organic frameworks(MOFs)are emerging as one of the most intriguing classes of heterogeneous photocatalysts owing to their abundant structures,tunable porosity,and versatile *** advantages of bottom-up design and reticular synthesis render MOF materials with desired photocatalytic properties for targeted *** this review,we discussed the design and synthesis of MOF-based photocatalysts as well as strategies for enhancing photocatalytic *** progress on MOFs as platforms for photocatalytic aerobic oxidation reactions was summarized and categorized according to the types of bond *** hope this review will give an in-depth insight into MOF-based photocatalytic systems for not only aerobic oxidation reactions but also other organic transformations.A brief outlook on the challenges and opportunities of MOFs as heterogeneous photocatalysts is provided at the end of the review.

关键词： metal-organic frameworks heterogeneous photocatalyst reactive oxygen species aerobic oxidation organic synthesis

Simulation of gamma minitype reference radiation for calibration of personal dosimeter

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Nuclear Science and Techniques 2020年第1期31卷 112-122页

作者： yi-xin liu yi-Kun Qian Zhi-Qiang Chen Biao Wei Peng Feng Ben-Jiang Mao Department of Engineering Physics Tsinghua UniversityBeijing 100084China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621999China Key Laboratory of Optoelectronics Technology and System Ministry of EducationChongqing UniversityChongqing 400044China

An investigation using Monte Carlo simulation on a minitype reference radiation(MRR) for the calibration of gamma personal dosimeters is reported. The distributions of dose rate and scattering gamma spectrum are the main simulation objects with the variable physical structures of MRR and the dosimeters as parameters that are to be calibrated. Further, the influences on the reference radiation caused by these parameters are analyzed in *** work provides a theoretical basis for better understanding of MRR used for calibration of gamma personal dosimeters. This analysis can help in the development of a calibration technology for such tools based on MRR.

关键词： Gamma personal dosimeter Minitype reference radiation Monte Carlo simulation Calibration

Experimental study on flow control of the turbulent boundary layer with micro-bubbles

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Acta Mechanica Sinica 2018年第5期34卷 830-838页

作者： Peng-Long Zhao Yao-Hui Chen Gang Dong yi-xin liu Xu-Jian Lyu Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094China School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing 210094China

The effect of micro-bubbles on the turbulent boundary layer in the channel flow with Reynolds numbers (Re) ranging from 0.87 × 105 to 1.23 × 105 is experimentally studied by using particle image velocimetry (PIV) *** microbubbles are produced by water *** velocity profiles,Reynolds stress and instantaneous structures of the boundary layer,with and without micro-bubbles,are measured and *** presence of micro-bubbles changes the streamwise mean velocity of the fluid and increases the wall shear *** results show that micro-bubbles have two effects,buoyancy and extrusion,which dominate the flow behavior of the mixed fluid in the turbulent boundary *** buoyancy effect leads to upward motion that drives the fluid motion in the same direction and,therefore,enhances the turbulence intense of the boundary *** for the extrusion effect,the presence of accumulated micro-bubbles pushes the flow structures in the turbulent boundary layer away from the near-wall *** interaction between these two effects causes the vorticity structures and turbulence activity to be in the region far away from the *** buoyancy effect is dominant when the Re is relatively small,while the extrusion effect plays a more important role when Re rises.

关键词： PIV Micro-bubbles Turbulent boundary layer Reynolds stress

Effective treatment for secondary angle-closure glaucoma caused by traumatic lens subluxation:phacoemulsification with capsular-tension-ring implantation combined with ophthalmic endoscope-controlled goniosynechialysis

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International Journal of Ophthalmology(English edition) 2021年第10期14卷 1548-1552页

作者： Qi Dai Lin Fu xin-yi liu Wei-Hua Pan School of Ophthalmology and Optometry Eye HospitalWenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina

AIM:To investigate the safety and efficacy of phacoemulsification with capsular-tension-ring implantation and posterior chamber intraocular lens implantation combined with ophthalmic endoscope-controlled goniosynechialysis(Phaco-CTR-IOL-OE-GSL)for treating secondary angle-closure glaucoma induced by traumatic lens ***:A retrospective and descriptive study was performed on patients with lens subluxation,angle closure,goniosynechia,and evaluated intraocular pressure(IOP)that cannot be controlled with medication,who underwent *** postoperative best-corrected visual acuity(BCVA),IOP,range of goniosynechia and complications were retrospectively ***:Nine patients with secondary angle-closure glaucoma induced by traumatic lens subluxation were *** follow-up period was 51.1±8.6 *** preoperative range of zonule rupture was 158.2°±33.0°,and the range of goniosynechia was 220.0°±92.5°.The baseline BCVA was 0.9±1.0 logMAR,IOP was 30.7±17.3 mm Hg and number of anti-glaucoma medication was 3.2±*** intraoperative hyphaemia with 8 eyes(88.8%)in the anterior chamber,and was absorbed two days *** eye(11.1%)had postoperative ciliary body detachment and was recovered after five days of topical drug *** was 0.2±0.2 logMAR at 3 mo *** average IOP at the last follow-up was 16.7±2.0 mm Hg,and no anti-glaucoma medications were *** average range of recurrent goniosynechia was 54.9°±33°at the final postoperative gonioscopic ***:Phaco-CTR-IOL-OE-GSL is safe and effective in the treatment of secondary angle-closure glaucoma induced by traumatic lens *** use of an endoscope provides a more direct and clear examination for GSL,and 360°dissection is easily achieved.

关键词： lens subluxation glaucoma tension ring goniosynechia ophthalmic endoscope