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Preparation of microparticles and nanoparticles using membrane-assisted dispersion,micromixing,and evaporation processes

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Particuology 2024年第1期84卷 30-44页

作者： Goran T.Vladisavljevic Chemical Engineering Department Loughborough UniversityLoughboroughLeicestershire LE113TUUnited Kingdom

Synthetic microporous membranes are increasingly used for energy-efficient and controlled production of micro-and nanoparticles and micro-and nanoemulsions with tuneable morphology and physico-chemical properties through various micromixing,emulsification,and evaporation processes.In emul-sification processes,the membrane pores are used for dispersed phase injection and size-controlled generation of droplets and droplet-templated particles.In micromixing processes,membrane is utilised as a micromixer for mixing two miscible liquids,usually solvent and antisolvent-rich solutions,which leads to the creation of supersaturation and subsequent nanoprecipitation or crystallisation.In mem-brane evaporation processes,membrane is used to prevent phase dispersion while allowing efficient molecular diffusion of solvent and/or antisolvent vapour through gas-filled pores.Membrane dispersion processes can be operated continuously by decoupling shear stress on the membrane surface from cross flow using tube insets,flow pulsations,swirling flow,membrane oscillations or membrane rotations.Droplet generation and solidification can be performed continuously in a single pass by connecting membrane module with a downstream reactor.Membrane dispersion processes can be used for pro-duction of nanoparticles such as nanovesicles(liposomes,micelles,ethosomes,and niosomes),nanogels,polymeric,lipid and metallic nanoparticles,and nanocrystals.The main advantages of membrane-assisted particle generation are in low energy consumption,controlled geometry and hydrodynamic conditions at the microscale level,flexible throughput due to modular and scalable design of membrane devices,and a wide choice of available microporous membranes with various wall porosities,wetta-bilities,pore sizes,and pore morphologies to suit different applications.

关键词： Nanoparticles Microparticles Nanoemulsions Microemulsions Microporous membrane crystallisation Flash nanoprecipitation Emulsification Zero liquid discharge

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Hybrid versus global thermostatting in molecular-dynamics simulation of methane-hydrate crystallisation

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2180-2188页

作者： Niall J.English Mohammad Reza Ghaani School of Chemical and Bioprocess Engineering University College Dublin

Molecular-dynamics(MD)simulations have been performed for the growth of a spherical methane-hydrate nano-crystallite,surrounded by a supersaturated water–methane liquid phase,using both a hybrid and globalsystem thermostatting approach.It was found that hybrid thermostatting led to more sluggish growth and the establishment of a radial temperature profile about the spherical hydrate crystallite,in which the growing crystal phase is at a higher temperature than the surrounding liquid phase in the interfacial region,owing to latent-heat dissipation.In addition,Onsager’s-hypothesis fluctuation–dissipation analysis of fluctuations in the number of crystal-state water molecules at the interface shows slower growth.

关键词： Molecular dynamics Clathrate hydrates crystallisation Thermostatting Radial temperature profile Fluctuation–dissipation

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Optimisation of superplastic processing parameters for (Cu_(43)Zr_(48)Al_9)_(98)Y_2 bulk metallic glasses

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Journal of Rare Earths 2019年第1期37卷 95-100,M0005页

作者： Bing Li Xuanxuan Xu Hucheng Zhang Ke Yang Xinhui Fan Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Key Laboratory for Photoelectric Functional Materials and Devices Xi'an Technological University Shanxi Jiangyang Chemical Co. Ltd.

In this study,hot compression tests of (Cu_(43)Zr_(48)Al_9)_(98)Y_2 bulk metallic glasses (BMGs) were performed,and their micro structure and thermal properties after the deformation were studied to explore the appropriate range of their optimum processing parameters. The experimental results show that the superplastic deformation of (Cu_(43)Zr_(48)Al_9)_(98)Y_2 bulk metallic glasses depends mainly on the temperature and strain rate. It is suitable for superplastic processing when the alloys are in the state of Newtonian flow and do not crystallise. The appropriate processing parameters of (Cu_(43)Zr_(48)Al_9)_(98)Y_2 BMGs are the temperatures and strain rates, which are below the "dividing line". And when the temperature is above733 K, the strain rate must be>1×10^(-3) s^(-1).

关键词： Bulk metallic glasses Superplastic Flow behaviour crystallisation behaviour Rare earths

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Iterative Learning Control of a crystallisation Process Using Batch Wise Updated Linearised Models

Iterative Learning Control of a Crystallisation Process Usin...

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2009中国控制与决策会议

作者： Jerome Nguyan Julian Morris School of Chemical Engineering and Advanced Materials Newcastle UniversityNewcastle upon Tyne NEl 7RUUK School of Chemical Engineering and Advanced Materials Newcastle UniversityNewcastle upon Tyne NE1 7RUUK

＜正＞An iterative learning control strategy with batch wise updated linearised models identified using principal component regression（PCR） is proposed in this paper for the supersaturation control of a batch crystallization process. Taking the immediate previous batch as the reference batch,the linearised model relates the deviations in the control profiles with the deviations in the quality variable trajectories between the current and the reference batches.The linearised model is used in calculating the control policy updating for the current batch.Simulation results show that the proposed method can overcome the effect of disturbance and improve the process operation from batch to batch.

关键词： Batch process crystallisation Iterative learning control Process control Data-driven model

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First Order Phase Transitions as Radiation Processes, Part Two

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Optics and Photonics Journal 2014年第2期4卷 26-37页

作者： Vitali A. Tatartchenko Pavel V. Smirnov Hongrong Jin Shanghai CEC ZhenHua Crystal Technology Co. Ltd. Shanghai China

This paper presents new experimental results concerning the PeTa effect—infrared characteristic radiation under first order phase transitions, especially during deposition and condensation of vapours/gases and the crystallisation of melts. The abbreviation “PeTa effect” means Perel’man-Tatartchenko’s effect. The nature of the PeTa effect is transient radiation that a particle (i.e., atom, molecule or/and cluster) emits during a transition from a meta-stable higher energetic level (in a super-cooled melt or super-saturated vapour) to the stable condensed lower level (in a crystal or liquid). The radiation removes latent heat with photons of characteristic frequencies that are generated under this transition. This paper is the second in a set describing the appearance of PeTa radiation under air cooling with deposition and condensation of air components. The radiation was recorded using an IR Fourier Spectrometer with a highly sensitive MCT detector. Certain peculiarities of the recorded radiation as well as its applications in the physics of the atmospheres of Earth and Jupiter are analysed.

关键词： PeTa Effect First Order Phase Transitions Vapour Condensation Vapour Deposition Melt crystallisation Infrared Radiation Atmospheric Phenomena Igloo Effect Jupiter

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