## 1 Introduction  
Emulsions and liposomes are promising components of microcapsule release agent delivery vectors due to their tailorable surface properties through surfactant selection and/or the addition of additives, and to their ability to store large amounts of release agent in compartments separated from the bulk solution [1, 2]. Oil-in-water emulsions can store hydrophobic release agents internally without altering the bulk solution properties. The dispersion is maintained for long periods of time due to the addition of surfactants at the interface which reduce surface tension between the two liquid phases. These dispersions allow for the storage, transport, and delivery of an active agent or drug loaded in the minor phase which would normally be poorly soluble in the bulk solution phase. Liposomes are entities comprised of a phospholipid bilayer (or multiple layers) enclosing an aqueous core. Hydrophilic release agents may be stored in the aqueous interior and layers, while hydrophobic agents may be sequestered in the lipid membranes surrounding these layers. This allows for the dispersion of active agents with differing chemistries within one particle system. Liposomes range in size from 1 to 100 nm in diameter, making them generally smaller and more stable than emulsions. The phospholipid bilayer may be functionalized by incorporating lipids with headgroup-containing molecules and ligands designed for cell-targeted drug delivery applications [3; 4; 5; 6]. Although these systems have shown great promise for release agent delivery in both industrial and biomedical applications, there are challenges associated with good manufacturing production (GMP) of the more complex systems due to the chemical instability or denaturation of the encapsulated compound in the manufacturing process, as well long-term stability issues since these nano-sized vectors tend to degrade and destabilize over time [7; 8]. Emulsions in storage destabilize through flocculation, creaming, breaking, and Ostwald ripening over time. Liposomes in storage destabilize through aggregation and coalescence [9]. Using extensive emulsifiers to stabilize the emulsion may not be a suitable solution due to environmental and health concerns [10]. Liposomal delivery vectors are prone to degradation when experiencing changes in the bulk solution, such as changes in salinity, pH and temperature. In biological systems, the system may experience multiple destabilizing changes in all these parameters, causing further problems for regulatory testing and application. The challenges of destabilization and premature leakage are often addressed through the encapsulation of emulsions and liposomes with a protective, bioactive/biocompatible shell, forming core-shell microcapsules. This approach is currently used in a variety of release agent delivery applications, such as in enhanced oil recovery [11], cosmetic agent delivery [10], food/flavor technology [12], drug delivery on a tissue/cellular scale [13] and in building materials [14]. The shell component of the microcapsule may serve to merely protect the delivery vector by partitioning the active agent from the bulk solution or may be a component of a complex microcapsule with surface functionalization directing the targeting or release profile of the internal active agent. A common method to synthesize emulsion core-shell microcapsules while addressing stability and emulsifier concerns is through the Pickering process [15]. This process utilizes nanoparticles rather than surfactants at the water-oil interface of emulsion droplets to reduce surface tension, resulting in a hard-granular shell surrounding a liquid, release agent-containing core. Often this is cheaper and safer than relying solely on additional surfactants to stabilize the vector due to the expense, health, and environmental concerns of excess surfactant in solution [16].