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Emulsions stabilized by Cellulose & Sugar-based Stabilizers


Project Description

The Centre for Sustainable Chemical Technologies (CSCT) at the University of Bath has launched a joint PhD programme with Monash University, Australia.
This project is one of a number that are in competition for up to four funded studentships. More details are available here: http://www.csct.ac.uk/study-with-us/.
Home institution: Bath University
Supervisor at Bath: Prof Karen Edler (lead)
Supervisor at Monash: Dr Rico Tabor

Context:

Emulsions are key to many consumer goods including foods, personal care and cleaning products, and are used in applications such as the delivery of drugs and agrochemical active compounds. Recently, Pickering emulsions, where adsorbed particles stabilise the oil-water interface, are gaining attention due to their improved stability, (potential for slow release) and lack of irritancy (e.g. on skin).1 Naturally derived, biodegradable particles are desirable for this application to reduce end-of-life environmental impact, and can potentially act as functional units that can enhance the properties of the emulsion (e.g. for drug binding and release). Combinations of soluble biopolymer and biopolymer nano/microparticles offer opportunities for the development of renewably derived and biodegradable emulsion systems and also formation of robust capsule systems due to charge complexation, entanglement or hydrogen bonding at the oil-water interface.2 Cellulose nanoparticles (both crystalline and fibrillar) can be sustainably produced from renewable resources such as waste plant biomass or recycled paper, or bio- synthesised by bacteria, while biodegradable polymeric amphiphiles can be synthesised from plant-derived sugars and fatty acid precursors. Active species can be incorporated within the emulsion droplets or via electrostatic or covalent binding to the particles/polymers.

We aim to study emulsions stabilized by cellulose nanofibrils, surface functionalized via straightforward reactions (e.g. using glycidyl based reagents) to vary charge sign and density, and hydrophobicity/philicity of the fibril surface. This will provide a tool-kit of particulate stabilisers which can be tuned to interact specifically with polymeric amphiphiles to vary the properties of the Pickering emulsion particle layer, altering permeability, thickness and strength, thus changing the encapsulation properties of the emulsion. Encapsulated species such as natural insect repellants (e.g. citriodiol) and sunscreens will be tested for extended release. Functionalised particles can also provide multiple functionality to the emulsion by allowing binding of other active species for multiple or extended release applications. Initially vegetable oils such as sunflower or jojoba will be used but we will also consider novel solvents such as deep eutectic solvents, which in our preliminary studies show excellent preservation of anti-oxidant species and biologically derived material (proteins, peptides, etc).

The student will be based in Bath, and they will initially work with Prof Edler and Dr Buchard on cellulose fibril stabilized oil or DES-in water emulsions will be prepared, and interactions between sugar-fatty acid polymers and the cellulose fibrils will be studied using SAXS, SANS, rheology, and confocal microscopy. During their year in Monash, supervised by Dr Tabor, they will use atomic force microscopy to determine the mechanical properties of encased oil droplets and how this relates to their release.3 Synchrotron SAXS will be utilized to determine shell porosity and thickness, and the relationship between shell structure and emulsion droplet release properties.

Application process

We invite applications from Science and Engineering graduates who have, or expect to obtain, a first or upper second class degree and have a strong interest in Sustainable & Circular Technologies.

You MUST express interest for three projects in order of preference – you can see all projects here: https://www.csct.ac.uk/bath-monash-global-phd-programme/ . Please submit your application at the Home institution of your preferred project (‘Home’ institution details can be found in the project summary). However, please note that you are applying for a joint PhD programme and applications will be processed as such.

University of Bath

Please submit your application through the following link: https://www.csct.ac.uk/bath-monash-global-phd-programme/
Please make sure to mention in the “finance” section of your application that you are applying for funding through the joint Bath/Monash PhD programme for your specified projects.
In the “research interests” section of your application, please name the three projects you are interested in and rank them in order of preference. Please also include the names of the Bath lead supervisors.

Monash University

Expressions of interest (EoI) can be lodged through https://www.monash.edu/science/bath-monash-program. The EoI should provide the following information:
CV including details of citizenship, your Official Academic Transcripts, key to grades/grading scale of your transcripts, evidence of English language proficiency (IELTS or TOEFL, for full requirements see: https://www.monash.edu/graduate-research/faqs-and-resources/content/chapter-two/2-2), and two referees and contact details (optional). You must provide a link to these documents in Section 8 using Google Drive (Instructions in Section 8).

Funding Notes

Bath Monash PhD studentships include tuition fee sponsorship and a living allowance (stipend) for the course duration (up to 42 months maximum). Note, however, that studentships for Bath-based projects will provide cover for UK/EU tuition fees ONLY. Non-Australian nationals studying in Australia will be required to pay their own Overseas Student Health Cover (OSHC).

Additional and suitably qualified applicants who can access a scholarship/studentship from other sources will be also considered.

References

1. Calabrese, V.; Courtenay, J. C.; Edler, K. J.; Scott, J. L., Pickering emulsions stabilized by naturally derived or biodegradable particles. Curr. Op. Green Sus. Chem. 2018, 12, 83-90.
2. Calabrese, V.; da Silva, M. A.; Schmitt, J.; Hossain, K. M. Z.; Scott, J. L.; Edler, K. J., Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface. Soft Matter 2019, DOI: 10.1039/C9SM01551E.
3. Meaney, S. P.; Follink, B.; Tabor, R. F., Synthesis, Characterization, and Applications of Polymer–Silica Core–Shell Microparticle Capsules. ACS Applied Materials & Interfaces 2018, 10 (49), 43068-43079.
4. Ali, M.; Meaney, S. P.; Abedin, M. J.; Holt, P.; Majumder, M.; Tabor, R. F., Graphene oxide–silica hybrid capsules for sustained fragrance release. J. Colloid Interface Sci. 2019, 552, 528-539.

How good is research at University of Bath in Chemistry?

FTE Category A staff submitted: 33.10

Research output data provided by the Research Excellence Framework (REF)

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