Fluid storage media and method of delivering a fluid

A method of making a fluid storage media, comprising the steps of:

• providing a plurality of microspheres, each microsphere comprising a porous core comprising a porous core material and having an exterior surface;
• applying a coating layer covering all of the exterior surface of the porous core to provide a coated porous core, wherein the coating layer comprises a coating material which transitions from a first state to a second state, and wherein in the first state the coating material is permeable to the fluid, and in the second state the material is impermeable to the fluid;
• applying a fluid to the coated porous core, wherein some of the fluid will diffuse through the coating material in the first state to establish a portion of the fluid within the porous core;
• transitioning the coating material from the first state to the second state while maintaining the fluid within the porous core, wherein the coating in the second state will seal the porous core with the fluid inside.