There are provided porous fibers having excellent removal performance with respect to a material to be purified; and a purification column into which an adsorbent material obtained by bundling the fibers is incorporated. The porous fibers satisfying the following conditions (a) and (b) and having a shape in which three or more projected parts are continuously present in the lengthwise direction on the periphery part of a solid-state fiber: (a) The modification degree Do/Di in a cross section is 1.2 to 6.6 when the diameter of the inscribed circle is denoted by Di and the diameter of the circumscribed circle is denoted by Do., and (b) The specific surface area of pores is 50 m.sup.2/g or more.

An additive three-dimensional fabrication system includes voice control for user interaction. This voice-controlled interface can enable a variety of voice-controlled functions and operations, while supporting interactions specific to consumer-oriented fabrication processes.

An additive three-dimensional fabrication system includes voice control for user interaction. This voice-controlled interface can enable a variety of voice-controlled functions and operations, while supporting interactions specific to consumer-oriented fabrication processes.

Actuators (artificial muscles) comprising twist-spun nanofiber yarn or twist-inserted polymer fibers generate torsional and/or tensile actuation when powered electrically, photonically, chemically, thermally, by absorption, or by other means. These artificial muscles utilize non-coiled or coiled yarns and can be either neat or comprising a guest. Devices comprising these artificial muscles are also described.

Actuators (artificial muscles) comprising twist-spun nanofiber yarn or twist-inserted polymer fibers generate torsional and/or tensile actuation when powered electrically, photonically, chemically, thermally, by absorption, or by other means. These artificial muscles utilize non-coiled or coiled yarns and can be either neat or comprising a guest. Devices comprising these artificial muscles are also described.

Clothing comprising a fabric intended for skin contact, which fabric comprises at least 20 wt. % of filaments produced from a polymer composition having an elastic modulus of 30-500 MPa (ISO 527, 1BA, 1 mm/min, 23° C.).

An anti-counterfeiting yarn includes a uniformly distributed up-conversion fluorescent material and a polymer, wherein the up-conversion fluorescent material comprises a maximum weight percent of about 1.8%. A method of preparing an anti-counterfeiting yarn includes mixing functional polymer chips containing up-conversion fluorescent material with polymer chips not containing up-conversion fluorescent material in a ratio such that the fluorescent material is uniformly distributed in the mixture, melting the mixture, extruding the melt into filaments, and producing anti-counterfeiting yarn through spinning and drawing the filaments.

An anti-counterfeiting yarn includes a uniformly distributed up-conversion fluorescent material and a polymer, wherein the up-conversion fluorescent material comprises a maximum weight percent of about 1.8%. A method of preparing an anti-counterfeiting yarn includes mixing functional polymer chips containing up-conversion fluorescent material with polymer chips not containing up-conversion fluorescent material in a ratio such that the fluorescent material is uniformly distributed in the mixture, melting the mixture, extruding the melt into filaments, and producing anti-counterfeiting yarn through spinning and drawing the filaments.

Provided is a composition containing fine fibers for forming a coating film. The composition has excellent spreadability and provides a coating film with excellent uniformity by application to a skin.

A composition for forming a coating film comprising the following components (a) and (b): (a) a fiber at 0.5 mass % or more and 10 mass % or less based on the total composition for forming a coating film. The fiber has an average fiber diameter of 0.1 μm or more and 7 μm or less and an aspect ratio [(average fiber length)/(average fiber diameter)] of 8 or more and 300 or less; and (b) a volatile component at 15 mass % or more and 90 mass % or less based on the total composition for forming a coating film.

The [(average fiber diameter).sup.2/(fiber content)] (μm.sup.2/mass %) of the composition is 0.005 or more and 7 or less, and the total content of the component (a) and the component (b) is 97 mass % or less.

This application relates to a hot-melt fiber containing silver particles, a preparation method thereof, and an article containing the hot-melt fiber.