Advances are needed in our understanding the fundamental processes that control the physicochemical properties of aerosols, governing aerosol properties such as particle size distribution, composition and phase across a broad range of application areas. CDT projects are exploring approaches to tailor and control aerosol particle properties for desired applications, the charging of aerosol particles, the photochemical transformation of aerosol, particle crystallisation and resuspension, and particle coalescence. They are also developing new aerosol sources.
Responsive Aerosol: A Design Framework for Aerosol with Required Properties
The broad objective of the PhD is to develop a framework for assessing the extent to which the responsive properties of aerosols can be designed and stimulated by changes in their environment. We will examine the potential of aerosols formed from gels and amorphous phases to provide dynamic response to environmental stimuli.
Time-Resolved Photochemistry of Organic Solutes in Aqueous Microdroplets
The photochemistry of atmospheric aerosols is crucial to assessing their climate and health impacts. However, the reaction dynamics of photochemical reactions may differ in aerosol compared to in macroscopic solutions. This project will develop a brand-new approach to study chemical reaction dynamics on ultrafast timescales in individual levitated droplets.
Venus, volcanoes and vacuum cleaners: understanding triboelectric aerosol charging
Electrostatic charge is generated through frictional (“triboelectric”) interactions between aerosol particles. This charging causes lightning in dust and volcanoes on Earth and in space, and hazards in industrial processing of powders and granular mixtures. The student will apply both theoretical and experimental techniques to investigate and understand the mechanisms involved.
Mechanics of soft aerosols
Many biological and synthetic aerosols are composed of soft materials that behave somewhere between fluids and solids, including viscous droplets of mucus proteins and lipids that transmit COVID19. In this project, you will explore the soft-matter science behind aerosol suspensions by modelling how surface tension and viscoelasticity affect droplet production and adhesion. The outcomes could be relevant to the science of masks and droplet spreading.
Development of a constant concentration particle source
Worldwide, methods of measuring particles require calibration, yet none exist. This project develops a commercial device to produce a known concentration of particles by controlling the charge state and fluid dynamics. The work will harness results from recent modelling to develop and test the first aerosol “concentration controlled” prototype.
This project is an industry funded studentship supported by Catalytic Instruments.
Crystallisation in nano-droplets
In this project you will develop cutting-edge instrumentation to produce and study sub-nanolitre droplets as they evolve in a controlled vapour environment, observing crystallisation and phase changes in real time using imaging and x-ray scattering. With this instrumentation you will study the fundamental science underpinning atmospheric, industrial and pharmaceutical processes.
High-confidence modelling of particle resuspension
The resuspension of particles deposited on surfaces is a crucially important generation mechanism for biological, environmental and hazardous aerosol particles. Using cutting edge experiments and models, the nature of the particle-surface interaction (e.g. particle shape, surface roughness) will be explored and the resuspension mechanism directly probed by high frame rate imaging.
This project is an industry funded studentship supported by DSTL.
The Coalescence of Drying Droplets
The initial experiment proposed here will focus on the collisions of water–water droplets of ~ 30–80 μm radius. This novel size makes the proposed work relevant to the research of aerosols and their microphysical properties. A comparison can be made with existing collisional regime maps of water to determine whether droplet size, and the shift in the kinetic regime, influencesthe collisional outcome. This will be investigated using two microdroplet dispensersto collide droplets, imaged by a stroboscopic imaging technique. Following this, the effect of viscosity on the regime map can be determined using the same method, with varying concentrations of aqueous sucrose droplets.
EPSRC CDT in Aerosol Science
University of Bristol
School of Chemistry
Bristol, BS8 1TS
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