Fundamental understanding of silicon alkoxide polymerization for the optimal design of silica capsules

Barros, Andre Martim (2024). Fundamental understanding of silicon alkoxide polymerization for the optimal design of silica capsules. University of Birmingham. Ph.D.

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Abstract

Encapsulation is currently recognized as a formulation tool that enables researchers in both industry and academia to design solutions for the protection and targeted release of consumer goods active ingredients. Most current encapsulation solutions use capsule walls (shells or membranes) which are formed from non-sustainable and non-biodegradable materials and could be classed as microplastics, thus effort is pivoting to develop technologies which address these ecological challenges. A leading candidate in these new material groups is silica due to its ubiquitous nature and chemical inertia towards biological and ecological systems.
Silica can be synthetized from various molecular precursors, the most popular one being the class of silicon alkoxides. The mechanism of their interfacial polymerization is further elucidated in this work via models, both conceptual and computational, which enabled the formulation of a novel concept called interfacial yield. Various synthesis levers such as the nature of the precursor and its reaction kinetics were leveraged to control this interfacial yield, allowing the tuning and improvement of the mechanical and barrier properties of the silica capsules. Furthermore, unique features of the capsules were uncovered. These stem from the fundamental material properties of silica such as its brittleness and hydrophilicity, paving the way for new exciting applications.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):