A method of forming a material structure from structural units contained within a liquid solution in a spray head is described. The liquid solution includes a solvent and a solute, the solute comprising a plurality of the structural units, the structural units including monomer units, oligomer units
A method of forming a material structure from structural units contained within a liquid solution in a spray head is described. The liquid solution includes a solvent and a solute, the solute comprising a plurality of the structural units, the structural units including monomer units, oligomer units, or combinations thereof. The method comprises forming droplets of the liquid solution including the structural units, and spraying the droplets on a substrate, thereby substantially increasing the reactivity of the structural units within the droplets relative to the structural units within the liquid solution in the spray head. The increase in reactivity can result from the droplets containing an excess of a particular ion, the ion excess resulting from a voltage applied to conductive walls of the device which dispenses the droplets. The material structure is then formed on the substrate from the more highly reactive structural units within the droplets.
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1. A method of forming a coating over a surface of a substrate from structural units contained within a liquid solution, the liquid solution comprising a solvent, the method comprising: forming positively charged droplets of the liquid solution, wherein the droplets include a plurality of the struct
1. A method of forming a coating over a surface of a substrate from structural units contained within a liquid solution, the liquid solution comprising a solvent, the method comprising: forming positively charged droplets of the liquid solution, wherein the droplets include a plurality of the structural units;directing the droplets to the surface of the substrate while allowing at least a portion of the solvent within the droplets to evaporate, thereby increasing a positive charge concentration within the droplets; andforming the coating over the surface of the substrate from the plurality of the structural units in the droplets; whereinthe increase in the positive charge concentration within the droplets as the droplets evaporate causes the structural units to be in a more highly reactive state, thereby allowing the structural units in the droplets to form covalent bonds to one another or to the surface of the substrate. 2. The method of claim 1, wherein the liquid solution further comprises an additive selected from the group consisting of a surfactant, an acid, and a salt. 3. The method of claim 1, wherein the coating is formulated to prevent or suppress water loss or uptake by the substrate, volatile loss or uptake by the substrate, oxidation via reaction with oxygen gas that can diffuse into the substrate, or surface abrasion. 4. The method of claim 1, wherein the positively charged droplets are formed by applying a voltage between an electrode of a spray head containing the liquid solution and a capillary of the spray head. 5. The method of claim 1, wherein the substrate is edible to humans, and the coating is an edible coating. 6. The method of claim 1, wherein the structural units comprise monomer units, oligomer units, or combinations thereof. 7. A method of forming a coating over a surface of a substrate from structural units contained within a liquid solution, the liquid solution comprising a solvent, the method comprising: forming negatively charged droplets of the liquid solution, wherein the droplets include a plurality of the structural units;directing the droplets to the surface of the substrate while allowing at least a portion of the solvent within the droplets to evaporate, thereby increasing a negative charge concentration within the droplets; andforming the coating over the surface of the substrate from the plurality of the structural units in the droplets; whereinthe increase in the negative charge concentration within the droplets as the droplets evaporate causes the structural units to be in a more highly reactive state, thereby allowing the structural units in the droplets to form covalent bonds to one another or to the surface of the substrate. 8. The method of claim 7, wherein the liquid solution further comprises an additive selected from the group consisting of a surfactant, an acid, and a salt. 9. The method of claim 7, wherein the droplets serve to sanitize the substrate. 10. The method of claim 9, wherein the substrate comprises agricultural equipment, produce, or medical equipment. 11. The method of claim 7, wherein the structural units comprise monomer units, oligomer units, or combinations thereof. 12. A method of forming a coating over a surface of a substrate from structural units contained within a solvent of a liquid solution, the liquid solution further comprising an enzyme, the method comprising: forming droplets of the liquid solution, wherein the droplets include a plurality of the structural units and the enzyme;directing the droplets to the surface of the substrate; andforming the coating over the surface of the substrate from the plurality of the structural units in the droplets; whereinthe forming of the coating comprises allowing the structural units in the droplets to form covalent bonds to one another or to the surface of the substrate;the enzyme is reactive with the coating or with the surface of the substrate; andthe substrate is edible and the coating is an edible coating. 13. The method of claim 12, wherein the structural units comprise monomer units, oligomer units, or combinations thereof. 14. The method of claim 13, wherein the coating comprises a polymer formed from the structural units. 15. The method of claim 13, wherein the monomer units, oligomer units, or combinations thereof comprise fatty acids. 16. The method of claim 12, wherein the enzyme is reactive with the coating but not with the surface of the substrate. 17. The method of claim 12, wherein the coating prevents or suppresses water loss from the substrate. 18. The method of claim 12, wherein the edible substrate is selected from the group consisting of fruits, vegetables, produce, seeds, nuts, beef, poultry, and seafood. 19. A method of forming a coating over a surface of a substrate from a plurality of structural units, the structural units comprising monomer units, oligomer units, or combinations thereof, the method comprising: transporting the structural units onto the surface of the substrate;transporting an enzyme onto the surface of the substrate; andforming the coating over the surface of the substrate from the plurality of the structural units; whereinthe forming of the coating comprises allowing the structural units to form covalent bonds to one another or to the surface of the substrate; andthe substrate is edible and the coating is an edible coating. 20. The method of claim 19, wherein the enzyme is reactive with the coating or with the surface of the substrate. 21. The method of claim 19, wherein the enzyme is reactive with the coating but not with the surface of the substrate. 22. The method of claim 19, wherein the enzyme is reactive with the surface of the substrate but not with the coating. 23. The method of claim 19, wherein the forming of the coating comprises polymerization of the structural units, wherein the polymerization occurs directly on or adjacent to the surface of the substrate. 24. The method of claim 19, wherein the monomer units, oligomer units, or combinations thereof comprise fatty acids possessing a carboxyl functionality and a hydroxyl functionality. 25. The method of claim 19, wherein the monomer units, oligomer units, or combinations thereof comprise a saturated or unsaturated carbon chain. 26. The method of claim 25, wherein the monomer units, oligomer units, or combinations thereof further comprise a glycerol constituent. 27. The method of claim 19, wherein the coating prevents or suppresses water loss from the substrate. 28. The method of claim 19, wherein the edible substrate is selected from the group consisting of fruits, vegetables, produce, seeds, nuts, beef, poultry, and seafood.
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