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Synthesis and application of colloids in soft matter systems
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Skelhon, Thomas S. (2013) Synthesis and application of colloids in soft matter systems. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2715860~S1
Abstract
We explore two distinct domains in the field of soft matter. The first three experimental
chapters concern the synthesis, characterisation and application of Janus particles
fabricated by heterogeneous polymerisation techniques. Initially in Chapter 2 we
describe an optimised one pot seeded emulsion polymerisation strategy to render
submicron amphiphilic Janus particles exhibiting surface active behaviour which can be
tuned by the variation of hydrophilic to hydrophobic lobe volume ratios. These particles
have been shown to inhibit ice recrystallisation in aqueous systems. In Chapter 3 we
explore the synthesis of hard-soft Janus particles comprising of respective high and low
glass transition temperature lobes. Although the rate of polymerisation is unaffected by
available seed particle surface area, particles with multiple soft lobes and secondary
nucleation occur below a seed surface area threshold. We additionally demonstrate the
ability to fabricate sub-micron hard-soft Janus particles. Chapter 4 utilises the particles
made in the previous chapter as building blocks to fabricate ‘colloidal molecules’ and
colloidosomes. In the former case, cluster morphology of particles is shown to be
governed by surface area minimisation of the central soft domain.
The final two experimental chapters explore two different strategies to emulsify water
into chocolate whilst retaining the desirable physical characteristics of the confectionery.
In Chapter 5 we utilise colloidal silica and a cationic polyelectrolyte to generate highly
stable quiescent Pickering emulsions, allowing up to 50% of the fat content in chocolate
to be replaced with water and fruit juice. Chapter 6 improves upon this work by allowing the replacement of up to 80% of the fat content in chocolate by the dispersion of aqueous
hydrogels within the chocolate fat matrix. In both chapters we characterise the physical
properties of the formulations and demonstrate their suitability for use in chocolate
confectionery.
Item Type: | Thesis (PhD) |
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Subjects: | Q Science > QD Chemistry |
Library of Congress Subject Headings (LCSH): | Colloids -- Synthesis, Soft condensed matter, Nanoparticles, Emulsions |
Official Date: | October 2013 |
Institution: | University of Warwick |
Theses Department: | Department of Chemistry |
Thesis Type: | PhD |
Publication Status: | Unpublished |
Supervisor(s)/Advisor: | Bon, Stefan Antonius Franciscus |
Extent: | xvii, 254 leaves : illustrations, charts. |
Language: | eng |
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