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Understanding Spray Coating Process: Visual Observation of Impingement of Multiple Droplets on a Substrate

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Journal of Shanghai Jiaotong university(Science) 2018年第1期23卷 97-105页

作者：黄渐持袁志豪高思易廖健杉 eslamian morteza University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University

Spray coating is a facile deposition process with numerous existing and emerging applications. However,spray coating is a stochastic process comprising impingement of many droplets which upon impact on a heated substrate may dry or solidify individually or coalesce first to form a thin liquid film and then dry to yield a thin solid film. There is very limited knowledge on how this process occurs; therefore in this work, high speed imaging is used to visualize the spray coating process. Two model solutions including food-dye with properties like those of water, and poly(3, 4-ethylenedioxythiophene) : poly(styrenesulfonate)(PEDOT : PSS), a polymeric solution, are sprayed onto permeable glossy paper and regular impermeable glass substrates. Substrates are kept at room temperature and 80?C elevated temperature. In some cases, a vertical ultrasonic vibration is imposed on the substrate to study its effect on the coating process. It is observed that the spray coating process is highly random and stochastic. A higher substrate temperature results in a better coating process in that a more uniform and defect-free coating forms. Imposed vibration in the case of glossy paper substrates results in better droplet spreading and more uniform coating. The results also show that under the conditions of these experiments,impinged droplets dry individually or as islands of multiple coalesced droplets to form a coating. In other words,at used spray flow rate and spray droplet size, a continuous thin liquid film does not form prior to drying even at room temperature. Further systematic studies and high magnification lenses are required to visualize and understand the details of the process.

关键词： spray coating visual observation droplet impact

Characteristics of the breakup and fragmentation of an electrohydrodynamic melt jet

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Particuology 2012年第3期10卷 255-265页

作者： Ahmad Khoshnevis Meisam Farzalipour Tabriz morteza Hemayatkhah Ahmad Esmaielzadeh Kandjani Javad Mollaei Milani Esmaeil Esmaeilzadeh morteza eslamian Mohammad Reza Vaezi Department of Mechanical Engineering University of Tabriz Tabriz Iran School of Engineering and Computing Sciences Texas A&M University-Corpus Christi TX 78412 USA Materials and Energy Research Center (MERC) Karaj Iran

In this study, the breakup of a melt jet into a viscous medium is investigated in the presence of an intense electric field. Fragmentation of the melt jet occurs due to both hydrodynamic and electrohydrodynamic （EHD） forces within two kinds of silicone oil of different viscosities. The size and shape characteristics of the produced particles have been studied using SEM images, and the particle size distributions were found to exhibit considerable variations when a voltage was applied and when both the viscosity and temperature of the base fluid were changed. The morphologies of the particles were also affected by the same parameters. For instance, by applying EHD force, significant enhancements in size reduction and increased roundness of the particles occurred. The breakup process of the melt jet was found to be dominant by hydrodynamic or electrohydrodynamic instabilities, depending on the situation. Governing mechanisms （instability） in the cases of pure hydrodynamic and electrohydrodynamic fragmentations are discussed.

关键词： Electrohydrodynamic atomizationMelt jet breakupMelt fragmentationPowder productionElectrohydrodynamic instabilities

A Solution Processable Flexible Transparent Conductive Graphene/PEDOT : PSS Film Fabricated by Spin and Blade Coating

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Journal of Shanghai Jiaotong university(Science) 2018年第1期23卷 106-111页

作者：房霄竹范志君顾宜宸史佳雯陈敏陈学文邱韶华 ZABIHI Fatemeh eslamian morteza 陈倩栎 University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shenzhen SAPO Photoelectric Co. Ltd. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University State Key Laboratory for Composite Materials School of Materials Science and Engineering Shanghai Jiao Tong University

Flexible transparent conductive films were made on PET substrates by spin and blade coating, using graphene sheets dispersed in PEDOT : PSS solution. Ultrasonic substrate vibration was used to improve microstructure and properties of the films. Comparing to the pristine PEDOT : PSS film, the sheet resistance is 3 to 4 orders of magnitude lower with the addition of graphene. The conductivity and reproducibility of the film are improved for two-layer films comparing to one-layer films, with a reduction in transparency. Films prepared with substrate vibration showed lower sheet resistance for one-layer films, as the size of dewetting areas is reduced. In addition, large-area flexible films with desirable conductivity and transmittance were successfully fabricated by blade coating, which is promising, as the process is low-cost, scalable and compatible with roll-to-roll manufacturing.

关键词： graphene PEDOT:PSS solution-processing blade coating ultrasonic substrate vibration

Improving the stability and performance of Sn-based perovskite solar cells by ultrasonic substrate vibration post treatment

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Improving the stability and performance of Sn-based perovski...

Visualizing traumatic brain injury:ocular clues for diagnosis and assessment

第五届新型太阳能电池学术研讨会

作者： Yihe Miao morteza eslamian University of Michigan-Shanghai Jiao Tong University Joint Institute

Lead halide perovskite solar cells(PSCs) show highly competitive power conversion efficiency among new generation solar cells. However, there is a concern about their environmental toxicity, which may hamper their practical utilization. As an alternative,less-toxic tin(Sn)-based PSCs have been proposed as a substitute for the Pb-based ***, pure Sn-based PSCs suffer from extreme instability and poor reproducibility, due to heterogeneous Sn perovskite layer, and the easy oxidation of Sn to ***, we propose to utilize ultrasonic substrate vibration post treatment(SVPT) imposed on the wet film of the perovskite layer, to improve the performance and stability of the Sn-based perovskite active layer. The SVPT has worked well on Pb-based *** ongoing results show that the SVPT method contributes to obtaining highly oriented and homogenous growing FASnI grains(Fig. 1), resulting from reduced number of grain boundaries and suppressed tin *** addition, we observed that the SVPT results in improved absorbance of the perovskite layer.

关键词： Sn-based perovskite solar cells lead-free perovskite solar cells ultrasonic vibration

来源： cnki会议评论

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Neural Regeneration Research 2025年第5期20卷 1399-1400页

作者： morteza Abyadeh Vivek Gupta Yuyi You Joao A.Paulo Mehdi Mirzaei ProGene Technologies Pty Ltd SydneyNSWAustralia Department of Clinical Medicine Faculty of MedicineHealth and Human SciencesMacquarie Medical SchoolMacquarie UniversityMacquarie ParkNorth RydeSydneyNSWAustralia Department of Cell Biology Harvard Medical SchoolBostonMAUSA

Traumatic brain injury (TBI) is defined as damage to the brain resulting from an external sudden physical force or shock to the *** is considered a silent public health epidemic causing significant death and disability *** were 64,000 TBI related deaths reported in the USA in 2020,with about US$76 billion in direct and indirect medical costs annually.

关键词： diagnosis ocular injury

Coalescence behaviour of water droplets in water‐oil interface under pulsatile electric fields

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Chinese Journal of Chemical Engineering 2016年第9期24卷 1147-1153页

作者： morteza Hosseini Faculty of chemical engineering Babol Noshirvani University of Technology

In this research, the deformation of water droplets in sunflower oil-interface under pulsatile electric field was studied experimentally. Three types of coalescence were observed:(i) complete coalescence,(ii) incomplete coalescence and(iii) no-coalescence. The first type is desirable because of leaving no secondary droplets. The second type that produced secondary droplets which caused by necking process, due to extreme elongation of droplets(mostly small droplets), was undesirable; because the small droplets were more difficult to coalesce and remove. The no-coalescence was caused by very fast coalescence and extensive pushing of droplet into the continuous phase. In this work the process was operated with the utilization of a batch cylindrical separator with high voltage system. The lower part of the cylinder was filled with the aqueous phase and its top part was filled with sunflower oil to form an interface between the two phases. The effects of electric field strength,frequency, and waveform types were investigated. It was found that, the ramp-ac waveform was the best waveform, avoiding the production of secondary droplets and in this case the frequency also played an important role.

关键词： Drop-interface coalescence Drops deformation Non-uniform electric field Di-electrophoresis Pulsatile electric field

Numerical study of cavitating flow in orifices and its effect on spray characteristics

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Journal of Hydrodynamics 2018年第5期30卷 908-919页

作者： morteza Ghorbani Mechatronics Engineering Program Faculty of Engineering and Natural Science Sabanci University Department of Biomedical Engineering and Health Systems KTH Royal Institute of Technology

The bubbly flow regime inside orifices has significant effects on several applications, and studying its trend along an orifice could be helpful in identifying the flow mechanism in various situations. The flow regime inside an orifice depends on the situation which has been specified for the orifice. Orifice geometry has a considerable effect on bubbly flow in injectors. Meanwhile, spray characteristics are influenced by the fuel flow inside an orifice, which has strong effects on the mixture of fuel-air. In this study, spray characteristics are studied for different values of the orifice angle. The cavitation phenomenon which occurs inside an orifice varies in intensity and patterns at different angles of the orifice and consequently has diverse effects on spray characteristics. The governing equations are solved by the SIMPLE algorithm. The spray flow is modeled by the discrete droplet method（DDM）, the droplet breakup is modeled by the WAVE model, and the primary breakup is modeled by the DIESEL BREAK UP model. In order to generate cavitation phenomenon inside orifices and investigate its effect on spray characteristics, the angle of orifice with respect to the injector body is varied and the problem is studied for different angles of orifice.

关键词： Cavitation iinjector angle microchannel spray

Novel attributes and design considerations of effective oxide thickness in nano DG MOSFETs

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Chinese Physics B 2015年第4期24卷 391-397页

作者： morteza Charmi Department of Nano Physics Malekashtar University of Technology

Impacts of effective oxide thickness on a symmetric double-gate MOSFET with 9-nm gate length are studied, using full quantum simulation. The simulations are based on a self-consistent solution of the two-dimensional(2D) Poisson equation and the Schr ¨odinger equation within the non-equilibrium Green’s function formalism. Oxide thickness and gate dielectric are investigated in terms of drain current, on-off current ratio, off current, sub-threshold swing, drain induced barrier lowering, transconductance, drain conductance, and voltage. Simulation results illustrate that we can improve the device performance by proper selection of the effective oxide thickness.

关键词： DG-MOSFET effective oxide thickness non-equilibrium Green’s function oxide thickness gate dielectric permittivity

Ant Colony Optimization as a Powerful Tool for Descriptor Selection in QSPR Study of Infinite Dilution Activity Coefficients of Halogenated Hydrocarbons in Water

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Chinese Journal of Structural Chemistry 2012年第7期31卷 953-958页

作者： morteza Atabati School of Chemistry Damghan University

A quantitative structure-property relationship （QSPR） study was suggested for the prediction of infinite dilution activity coefficients of halogenated hydrocarbons, γ∞ , in water at 298.15 K. After optimization of 3D geometry of the halogenated hydrocarbons with semi-empirical quantum chemical calculations at the AM1 level, different descriptors （1514 descriptors） were calculated by the HyperChem and Dragon softwares. A major problem of QSPR is the high dimensionality of the descriptor space; therefore, descriptor selection is the most important step. In this paper, an ant colony optimization （ACO） algorithm was proposed to select the best descriptors. Then the selected descriptors were applied for model development using multiple linear regression. The average absolute relative deviation and correlation coefficient for the training set were obtained as 4.36% and 0.951, respectively, while the corresponding values for the test set were 5.96% and 0.929, respectively. The results showed that the applied procedure is suitable for the prediction of γ∞ of halogenated hydrocarbons in water.

关键词： infinite dilution activity coefficient ant colonyoptimization halogenated hydrocarbons QSPR