Technologies for fibers with nanotechnology is disclosed. In the illustrative embodiment, a preform is 3D printed with one or more sacrificial cores and one or more hollow channels. The preform is drawn into a fiber, and one or more metal core(s) is inserted into the hollow channel during the fiber draw. The fiber is then heated, breaking up the sacrificial cores into balls through capillary action. The fiber can be etched, exposing the balls made up of the sacrificial cores. The balls can be selectively etched, exposing the metal core(s) of the fiber. Additional embodiments are disclosed.

A composite yarn comprising a continuous multifilament core yarn incorporated in a matrix is characterised in that the matrix comprises at least one polymer material and at least one reinforcing filler, the reinforcing filler being formed from functionalized particles, said particles having a median size (d.sub.v5o) of less than 40 μm. A process for manufacturing such a composite yarn, comprises at least one step of depositing, by coating or extrusion, a matrix comprising a polymer and a reinforcing filler, onto a core yarn. A textile surface comprises at least one such composite yarn.

A composite yarn comprising a continuous multifilament core yarn incorporated in a matrix is characterised in that the matrix comprises at least one polymer material and at least one reinforcing filler, the reinforcing filler being formed from functionalized particles, said particles having a median size (d.sub.v5o) of less than 40 μm. A process for manufacturing such a composite yarn, comprises at least one step of depositing, by coating or extrusion, a matrix comprising a polymer and a reinforcing filler, onto a core yarn. A textile surface comprises at least one such composite yarn.

A resin structure that includes a plurality of piezoelectric fibers that generate a charge by application of external energy; and an insulating resin coating at least one of the plurality of piezoelectric fibers.

A resin structure that includes a plurality of piezoelectric fibers that generate a charge by application of external energy; and an insulating resin coating at least one of the plurality of piezoelectric fibers.

A method of generating a coiled actuator fiber that includes twisting a fiber to generate a twisted fiber; wrapping the twisted fiber around a core yarn or fiber to generate a coil in the twisted fiber, which generates a coiled twisted fiber; setting the coiled twisted fiber by heat or chemical treatment; and removing at least a portion of the core yarn or fiber to generate a coiled actuator fiber.

A method of generating a coiled actuator fiber that includes twisting a fiber to generate a twisted fiber; wrapping the twisted fiber around a core yarn or fiber to generate a coil in the twisted fiber, which generates a coiled twisted fiber; setting the coiled twisted fiber by heat or chemical treatment; and removing at least a portion of the core yarn or fiber to generate a coiled actuator fiber.

A heatable glove liner, including a glove shaped garment having a conductive composite yarn sewn along a portion thereof, wherein the ends of the at least one strand of electrically conductive metal forming the core of the conductive composite yarn have electrical leads configured for connection to a power source to form an electrical circuit, such that upon completion of the electrical circuit, the conductive composite yarn heats up due to electrical resistance; and a glove containing the same.

A heatable glove liner, including a glove shaped garment having a conductive composite yarn sewn along a portion thereof, wherein the ends of the at least one strand of electrically conductive metal forming the core of the conductive composite yarn have electrical leads configured for connection to a power source to form an electrical circuit, such that upon completion of the electrical circuit, the conductive composite yarn heats up due to electrical resistance; and a glove containing the same.

A filamentary core for an elastic composite yarn, particularly for an elastic textile composite yarn, comprising at least two elastic performance filaments, wherein each of the at least two elastic performance filaments is capable of being stretched at least about 2 times its package length and has at least 90% up to 100% elastic recovery after having being released from a stretching 2 times its package length.