The particle of any of claims 1- 6, wherein the aqueous phase and the oil phase are present in a volumetric ratio of about 1:100 to about 100:1 or about 1:50 to about 50:1.Ĩ. The particle of any of claims 1- 7, wherein the aqueous phase comprises pores, and the oil phase occupies at least one of the pores.ĩ. The particle of any of claims 1- 8, wherein the oil phase forms a single compartment in the aqueous phase and/or the silk-based material.ġ0. The particle of any of claims 1- 9, wherein the oil phase forms a plurality of compartments in the aqueous phase and/or the silk-based material.ġ1. The particle of claim 9 or 10, wherein the size of the compartment is in a range of about 10 nm to about 500 μm, or about 50 nm to about 100 μm, or about 100 nm to about 20 μm.ġ2. The particle of any of claims 1- 11, wherein the odor-releasing substance and/or the flavoring substance comprises a hydrophobic or lipophilic molecule.ġ3. The particle of any of claims 1- 12, wherein the odor-releasing substance and/or the flavoring substance comprises limonene, delta-damascone, applinate, dihydromyrcenol, or any combinations thereof.ġ4. The particle of any of claims 1- 13, wherein the silk-based material comprises an additive and/or an active agent.ġ5. The particle of claim 14, wherein the additive is selected from the group consisting of biocompatible polymers, plasticizers (e.g., glycerol) emulsifiers or emulsion stabilizers (e.g., polyvinyl alcohol, lecithin), surfactants (e.g., polysorbate-20), interfacial tension-reducing agents (e.g., salt), beta-sheet inducing agents (e.g., salt), detectable labels, and any combinations thereof.ġ6. The particle of any of claims 1- 15, wherein the silk-based material is present in a form of a hydrogel.ġ7. The particle of any of claims 1- 16, wherein the silk-based material is present in a dried state or lyophilized.ġ8. The particle of any of claims 1- 17, wherein the silk-based material is porous.ġ9. The particle of any of claims 1- 18, wherein the silk-based material is soluble in an aqueous solution.Ģ0. The particle of any of claims 1- 18, wherein beta-sheet content in the silk-based material is adjusted to an amount sufficient to enable the silk-based material to resist dissolution in an aqueous solution.Ģ1. The particle of any of claims 1- 20, wherein the size of the particle ranges from about 1 μm to about 10 mm, or from about 5 μm to about 5 mm, or from about 10 μm to about 1 mm.Ģ2. The particle of any of claim 1- 21, wherein the silk particle is adapted to be permeable to the odor-releasing substance and/or the flavoring substance such that the odor-releasing substance and/or the flavoring substance is released from the silk particle into an ambient surrounding at a pre-determined rate.Ģ3.
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