Activated carbon fibers and methods of stabilizing, carbonizing, and activating carbon fibers are disclosed. The activated carbon fibers can be used in filtration, chemical capture, energy storage, and other applications. A method of producing an activated carbon fiber material for filtration or gas adsorption can include melt blowing pitch to form pitch fibers, stabilizing the pitch fibers to form stabilized pitch fibers, carbonizing the stabilized pitch fibers to form carbon fibers, and activating the carbon fibers to form activated carbon fibers with a specific surface area of at least 1900 m.sup.2/g.

In various embodiments, the present disclosure pertains to organic polymer core-shell particles that comprise a non-porous organic polymer core (i.e., having a pore volume of less than 0.1 cc/g) and a porous organic polymer shell (i.e., having a pore volume of greater than 0.1 cc/g), in which the porous organic polymer shell has a pore size ranging from 100 to 3000 . In some embodiments, the present disclosure pertains to chromatographic separation devices that comprise such organic polymer core-shell particles. In some embodiments, the present disclosure pertains to chromatographic methods that comprise: (a) loading a sample onto a chromatographic column comprising such organic polymer core-shell particles and (b) flowing a mobile phase through the column.

An absorbent, a preparation method therefor and use thereof are provided. The absorbent has a liquid channel, and the liquid channel has a low-tortuous porous structure. The absorbent can realize fast and large-scale absorption of various liquids without consuming external energy and not requiring additional apparatuses when in use. The absorbent can be used for efficient, safe and comfortable medical sampling and can also be used for recovery of various liquids.