## 1 Introduction
Emulsion-derived core-shell microcapsules made through the Pickering process are used to deliver active agents in a variety of applications including cosmetics [10; 17], food additives [18], and oil recovery applications [11], wastewater treatment [19], and as enhancements to building materials [20]. Core-shell particles derived through the Pickering process, however, have some limitations. The process does not create core-shell particles with a continuous protective shell but rather creates a loose collection of nanoparticles at the interface that adhere due to interactions between oil/water (O/W) interfaces and the surface properties of the nanoparticles. This can lead to core-shell particles that experience premature leakage of the entrapped active agent and are susceptible to degradation due to shear stress and to changes in the bulk solution environment. There is a current research focus on methods and formulations involving crosslinking at the interface and additional coating of the Pickering emulsion to address leakage and stability limitations [21; 22]. These promising proposed methods may prove to be complex and expensive, offsetting the simplicity and cost benefits of using Pickering core-shell microcapsules [21]. It would prove beneficial to the field to have an additional method, at their disposal, which may be used in addition to, or in lieu of, the traditional Pickering process to address stability and leakage challenges without the need for other complex post-processing methods. Liposomal delivery vectors are stabilized and functionalized through the addition of additives either onto or into the phospholipid bilayer to form a core-shell microcapsule. Current research is focused on understanding and addressing the challenges of destabilizing mechanisms of flocculation and coalescence of liposomal microparticles both in vivo and ex vivo [23]. Some common techniques involve the addition of additives, such as polyethylene glycol (PEG), polysaccharides [24; 25], chitosan [26], and cholesterol [27], which yield liposomal core-shell microcapsules that are resistant to destabilization during storage and are functionalized for drug/agent delivery and uptake. Thesecurrent techniques have challenges and limitations including high processing cost, difficulty in process scale-up, detrimental effects on the drug/chemical release profile, and the loss of core-shell stability in shear stress environments [27; 28; 29]. The stability of liposomal core-shell drug delivery vectors under shear stress is of particular concern in delivery systems using inhalers where premature destruction or leakage of the drug/chemical occurs during atomization, nebulization, and inhalation [30; 31]. It may benefit the field to have an additional tool at its disposal; a method to further stabilize liposomal microcapsules during lyophilization and storage and which may reduce leakage by application of a continuous shell which is applied and removed under benign conditions. Emulsion and liposomal derived core-shell delivery vectors suffer degradation upon lyophilization making long term storage and transport difficult [32; 33]. Without water that has created the self-assembly of these vesicles, the structure of the vesicles are often altered or collapses, leading to premature drug leakage and aggregation or fusion of the vesicles [32; 34]. This is a particular challenge with liposomal core-shell drug delivery vectors which need to be in a solid dosage form that can be variably reconstituted and dosed at a later date depending on which route the drug is to be administered [33]. To address these limitations for the wide variety of emulsion and liposome-based delivery applications, we have developed an easily applied method of creating core-shell microcapsules where a liquid emulsion or liposome droplet is encapsulated with a mineral shell, which may offer increased stability and reduced leakage due to the continuity of the smooth and uniformly coated shell. The Dinoflagellate cyst is an inspiration for this method [35].