A mesoporous organic material which makes it possible to extract, using the liquid-solid extraction technique, the uranium(VI) contained in an aqueous medium including phosphoric acid, with high efficiency and high selectivity for the iron that the medium can likewise contain. The material is likely to be obtained by cross-linking polymerisation of a monomer of formula (I) below, wherein: R.sup.1, R.sup.2 and R.sup.3 are, independently from one another, H, a C.sub.1 to C.sub.12 saturated or unsaturated, linear or branched hydrocarbon group, or a polymerisable group, with the condition that at least one of R.sup.1, R.sup.2 and R.sup.3 is a polymerisable group; R.sup.4 and R.sup.5 are, independently from one another, H or a C.sub.1 to C.sub.8 saturated or unsaturated, linear or branched hydrocarbon group; the cross-linking polymerisation being carried out in the presence of a cross-linking agent and one or more pore-forming agents.

Provided are a porous film having excellent surface smoothness and a method for producing the same. The surface roughness of a porous film of polyvinylidene fluoride, polyethersulfone, polyimide and/or polyamide-imide is Ra 30,000 Å or less. The opening diameter of the porous film is preferably from 100 nm to 5000 nm. The method for producing a porous film preferably includes a step for kneading a varnish containing fine particles and at least one resin selected from the group consisting of polyvinylidene fluoride, polyether sulfone, polyamic acid, polyimide, polyamide-imide precursor, and polyamide-imide. The varnish preferably has a viscosity at 25° C. of 0.1-3 Pa.Math.s, a solids fraction concentration of 10-50 mass %, and a fine particle average particle size of 10-5000 nm.

Provided are a porous film having excellent surface smoothness and a method for producing the same. The surface roughness of a porous film of polyvinylidene fluoride, polyethersulfone, polyimide and/or polyamide-imide is Ra 30,000 Å or less. The opening diameter of the porous film is preferably from 100 nm to 5000 nm. The method for producing a porous film preferably includes a step for kneading a varnish containing fine particles and at least one resin selected from the group consisting of polyvinylidene fluoride, polyether sulfone, polyamic acid, polyimide, polyamide-imide precursor, and polyamide-imide. The varnish preferably has a viscosity at 25° C. of 0.1-3 Pa.Math.s, a solids fraction concentration of 10-50 mass %, and a fine particle average particle size of 10-5000 nm.

The present invention relates to a composite film that is capable of converting mechanical energy to electrical energy. The film comprises a substrate and piezoelectric nanoparticles that are configured to form a plurality of pores. The present film is flexible and highly porous, providing high permittivity and beneficial porosity-mediated mechanical properties. When used in a piezoelectric nanogenerator (PNG), the film provides enlarged bulk film strain and reduced film impedance, resulting in a high efficiency PNG with increased output voltage and current as compared to known PNGs. A method of synthesizing the film is also described. The provided method is simple and cost-effective.

The present invention relates to a composite film that is capable of converting mechanical energy to electrical energy. The film comprises a substrate and piezoelectric nanoparticles that are configured to form a plurality of pores. The present film is flexible and highly porous, providing high permittivity and beneficial porosity-mediated mechanical properties. When used in a piezoelectric nanogenerator (PNG), the film provides enlarged bulk film strain and reduced film impedance, resulting in a high efficiency PNG with increased output voltage and current as compared to known PNGs. A method of synthesizing the film is also described. The provided method is simple and cost-effective.

The invention relates to a material including a support consisting of a porous composite material including at least one polymer phase forming a binder based on at least one polymer selected from thermoplastic polymers, elastomers, and elastomer thermoplastics, and at least one filler selected from thermally conductive fillers, the pores of the support consisting of the porous composite material being partially or entirely filled with at least one phase-change material. The invention also relates to a method for producing said material.

An intravascular multi-side hole catheter containing a bioscaffold capable of housing therapeutic cells is provided. The catheter comprises a plurality of side holes distributed along the length of the catheter in a spiraling corkscrew pattern. The bioscaffold inside the catheter is designed with a plurality of macropores capable of encapsulating therapeutic cells for cellular therapy. Upon placement of the catheter in a vein, the side holes allow blood to flow though the catheter thereby supplying oxygen and nutrients to any loaded cellular cargo and also providing for the removal of waste products. Methods of producing the intravascular catheter and methods of using the intravascular catheter in cellular therapy, including for delivery of insulin-secreting cells such as beta cells or stem cell-derived islets into blood vessels for treating type 1 diabetes are also disclosed.

An intravascular multi-side hole catheter containing a bioscaffold capable of housing therapeutic cells is provided. The catheter comprises a plurality of side holes distributed along the length of the catheter in a spiraling corkscrew pattern. The bioscaffold inside the catheter is designed with a plurality of macropores capable of encapsulating therapeutic cells for cellular therapy. Upon placement of the catheter in a vein, the side holes allow blood to flow though the catheter thereby supplying oxygen and nutrients to any loaded cellular cargo and also providing for the removal of waste products. Methods of producing the intravascular catheter and methods of using the intravascular catheter in cellular therapy, including for delivery of insulin-secreting cells such as beta cells or stem cell-derived islets into blood vessels for treating type 1 diabetes are also disclosed.

A particle-dispersed polyimide precursor solution contains a polyimide precursor having a unit represented by the following formula (I), particles, and a solvent, in which the particle-dispersed polyimide precursor solution satisfies both the following conditions (1) and (2),

##STR00001## (in the formula (I), A represents a tetravalent organic group, and B represents a divalent organic group represented by any of the following formulas (B1) to (B4)),

##STR00002## (in the formulas (B1) to (B4), Ar.sup.1, Ar.sup.10, and Ar.sup.11 each independently represent a trivalent aromatic group which may have a substituent, Ar.sup.2, Ar.sup.4, Ar.sup.5, Ar.sup.7 and Ar.sup.8 each independently represent a divalent aromatic group which may have a substituent, Ar.sup.3 and Ar.sup.6 each independently represent a tetravalent aromatic group which may have a substituent or a group represented by the following formula (II), Ar.sup.9 represents a divalent aromatic group which may have a substituent or a group represented by the following formula (III), X.sup.1 to X.sup.7 each independently represent NRa, O, or S, Ra represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group, and * represents a bonding site with an adjacent linking group), and

##STR00003## (in the formulas (II) and (III), Ar.sup.12 and Ar.sup.13 each independently represent a trivalent aromatic group which may have a substituent, Ar.sup.14 and Ar.sup.15 each independently represent a divalent aromatic group which may have a substituent, Y and Z each independently represent O, S, S(═O).sub.2, or CRbRc, Rb and Rc each independently represent a hydrogen atom, an alkyl group which may have a substituent, or an aryl group, and * represents a bonding site with an adjacent linking group),

Condition (1): a total content of the groups represented by the formulas (B1) to (B4) is 1% by mass or more and 40% by mass or less with respect to a total amount of the polyimide precursor, and

Condition (2): a content of the particles is 5% by mass or more and 90% by mass or less with respect to a total content of the polyimide precursor and the particles.

A particle-dispersed polyimide precursor solution contains a polyimide precursor having a unit represented by the following formula (I), particles, and a solvent, in which the particle-dispersed polyimide precursor solution satisfies both the following conditions (1) and (2),

##STR00001## (in the formula (I), A represents a tetravalent organic group, and B represents a divalent organic group represented by any of the following formulas (B1) to (B4)),

##STR00002## (in the formulas (B1) to (B4), Ar.sup.1, Ar.sup.10, and Ar.sup.11 each independently represent a trivalent aromatic group which may have a substituent, Ar.sup.2, Ar.sup.4, Ar.sup.5, Ar.sup.7 and Ar.sup.8 each independently represent a divalent aromatic group which may have a substituent, Ar.sup.3 and Ar.sup.6 each independently represent a tetravalent aromatic group which may have a substituent or a group represented by the following formula (II), Ar.sup.9 represents a divalent aromatic group which may have a substituent or a group represented by the following formula (III), X.sup.1 to X.sup.7 each independently represent NRa, O, or S, Ra represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group, and * represents a bonding site with an adjacent linking group), and

##STR00003## (in the formulas (II) and (III), Ar.sup.12 and Ar.sup.13 each independently represent a trivalent aromatic group which may have a substituent, Ar.sup.14 and Ar.sup.15 each independently represent a divalent aromatic group which may have a substituent, Y and Z each independently represent O, S, S(═O).sub.2, or CRbRc, Rb and Rc each independently represent a hydrogen atom, an alkyl group which may have a substituent, or an aryl group, and * represents a bonding site with an adjacent linking group),

Condition (1): a total content of the groups represented by the formulas (B1) to (B4) is 1% by mass or more and 40% by mass or less with respect to a total amount of the polyimide precursor, and

Condition (2): a content of the particles is 5% by mass or more and 90% by mass or less with respect to a total content of the polyimide precursor and the particles.