Method for producing a retention matrix comprising a functional liquid

1. Method for producing a device provided with one or more sealed cavities filled with at least one liquid trapped in a porous retention material, comprising the steps of:

a) forming a porous material in one or more cavities produced in at least one given layer deposited on a support, one or more walls formed in said layer separating between them the cavities,

b) filling at least one of said cavities by means of at least one liquid, the liquid being trapped in the porous material,

c) forming a sealing layer enabling said cavities to be individually sealed and to form separate sealed enclosures,

wherein the porous material and the walls of the cavities are each formed from said given layer; and

wherein step a) comprises the steps of:

depositing a layer of at least one given material, the given material being suited to being transformed into gel and being photosensitive,

exposing to a light radiation first parts of the layer of said given material, whereas second parts of the layer of said given material are protected from said radiation, the first parts or the second parts being intended to form said walls of said cavities, and

forming porosities in certain parts of the layer of said given material.

2. Method according to claim 1 , wherein, after production of said cavities, the formation of said porous material at step a) comprises steps of:

depositing in at least one of said cavities a liquid comprising particles in suspension,

eliminating said liquid, so as to form a cluster of particles, in particular a cluster of beads.

3. Method according to claim 2 , wherein, after production of said cavities, the formation of said porous material at step a) further comprises, steps:

of infiltration of the cluster of beads by a liquid intended to be solidified,

of solidification of said liquid,

of eliminating said particles.

4. Method according to claim 1 , wherein after formation of said cavities, the formation of the porous material at step a) comprises steps of:

depositing in at least one of said cavities a mixture of at least one given material, liquid capable of being transformed into gel and of at least one solvent,

treating said mixture so as to transform said given material into gel,

eliminating said solvent.

5. Method according to claim 1 , said sealing layer being formed of a material infiltrated into porosities of said porous material or covering said porous material.

6. Method according to claim 1 , the sealing layer being formed by polymerization of a polymerizable liquid spread out on said porous material.

7. Method according to claim 1 , the sealing layer being formed at a pressure between 1 and 500 mbars, or under primary vacuum.

8. Method according to claim 1 , wherein the sealing layer is based on poly-para-xylylene, poly(1,3,5-trivinyl trimethyl cyclotrisiloxane), or at least one adhesive transparent in the visible radiation domain, or at least one ink polymerizable under ultraviolet.

9. Method according to claim 1 , the porous material being an aerogel or being formed by means of a porogen material.