Abstract:
The invention relates to processes for preparing a synthetic foam having present therein particles with a controlled particle distribution and the use of said foam, as well as to foams as such. Accordingly the invention is directed to a process for preparing a synthetic foam having present therein particles, wherein the distribution of said particles is controlled by the following steps of dissolving at least one synthetic polymer in one or more solvents to form a solution; contacting particles with said solution to form a polymer/particles mixture; and freeze-drying the polymer/particles mixture by: freezing the polymer/particles mixture; and subsequently subliming the one or more solvents to form a synthetic foam comprising said particles.
Abstract:
The present invention relates to a method for producing a porous material comprising the steps of; (a) providing a C/W emulsion comprising an aqueous phase, a matrix building material, a surfactant and liquid CO 2 phase; (b) at least partially freezing the aqueous phase; (c) gasifying CO 2 from the liquid CO 2 phase to form an intermediate porous material; (d) venting the gasified CO 2 from the intermediate porous material; and (e) freeze drying the intermediate porous material at least substantially to remove the aqueous phase and form the porous material. The present invention also relates to a porous material obtainable by the method.
Abstract:
The present invention relates to porous beads and to methods of production thereof, in particular to a method of producing hydrophilic polymeric beads by freeze-drying a droplet containing a polymeric material in a continuous phase of an oil-in-water (O/W) emulsion.
Abstract:
A method for preparing a highly porous, high surface area non-degradable material, comprises the steps of mixing a non-degradable polymer with a solvent or mixture of solvents; gelling the mixture; and treating the gel under conditions whereby a substantially solvent free porous structure is created having a porosity greater than about 80%. The resultant material is mechanically strong and has an architecture comprising at least one of nano fibrous, micro fibrous, non fibrous, complex porous structure with nano fibrous architecture, and mixtures thereof. A method for preparing a highly porous, high surface area degradable or partially degradable material, comprises the steps of mixing a degradable or partially degradable polymer with a mixed solvent comprising a first solvent and a second solvent, wherein the mixed solvent comprises a ratio higher than 1:1, first solvent to second solvent; gelling the mixture; and treating the gel under conditions whereby a substantially solvent free porous structure is created having a porosity greater than about 80%; wherein the material is mechanically strong and has a complex porous structure with nano fibrous architecture.