Sk Innovation Co., Ltd.

Electronics and Telecommunications Research Institute

Sk Global Chemical Co., Ltd.

Woong Chul Shin

Byoung Gon Yu

Sung Min Yoon

Ji Min Kim

Nam Yeal Lee

Yeon Hwa La

Min Ji Sung

Sangouk Ryu

Sung Bum Park

Dae Sung Song

Disclosed is a method of purifying carbon nanotubes, including treating carbon nanotubes with an inert gas at a high temperature in a low vacuum in a reactor and obtaining ultrapure carbon nanotubes, wherein the ultrapure carbon nanotubes contain 50 ppm or less of each metal remaining therein.

Method of purifying carbon nanotubes

Disclosed is a method of efficiently separating 1,3-butadiene and methylethylketone, which are compounds of interest, from byproducts or impurities in the dehydration products of 2,3-butanediol so as to recover the compounds of interest at high purity.

Method of recovering 1,3-butadiene and methylethylketone from dehydration products of 2,3-butanediol

A multibit phase change memory device structured such that a plurality of individual phase change memory devices are aligned in a plan area or vertically, and a method of driving the same are provided. The multibit phase change memory device includes a phase change material layer having a plurality of contact portions being in contact with a heating electrode, and having a plurality of active regions, each active region forming a unit phase change memory device. The phase change material layer may be composed of one material layer in which the plurality of active regions are aligned in plural arrays. Alternatively, the phase change material layer may be composed of a plurality of phase change material layers in which one or plural active regions are respectively aligned in one array. The plurality of phase change material layers may be disposed in a same level of a plan area, or the plurality of phase change material layers may be respectively disposed on different plan areas in a same vertical line.

Multibit phase change memory device and method of driving the same

Growing community of inventors

Daejeon, South Korea

Woong Chul Shin