Abstract:
본 발명은 강유전체 폴리머(Ferroelectric Polymer)인 P(VDF-TrFE)로 이루어져, 소자의 특성을 개선시킨 강유전체 폴리머 나노도트 소자 및 그 제조를 위한 디웨팅 프로세스(Dewetting Process)에 관한 것으로, 강유전체 폴리머 나노도트 소자는 절연물질로 이루어진 기판, 기판 상면에 형성된 하부 전극, 하부 전극 상면의 일부 영역에 요철 구조로 형성되고, P(VDF-TrFE)로 이루어진 P(VDF-TrFE) 나노도트 및 P(VDF-TrFE) 나노도트 상면에 형성된 상부 전극을 포함하는 것을 특징으로 한다. 나아가, 본 발명에 따른 강유전체 폴리머 나노도트 소자 제조를 위한 디웨팅 프로세스(Dewetting process)는 기판을 준비하는 단계, 기판 상면에 하부 전극을 형성하는 단계, P(VDF-TrFE) 폴리머 용액을 획득하는 단계, 하부 전극 상면에 P(VDF-TrFE) 폴리머 용액을 도포하는 단계, 어닐링(Annealing) 공정으로 P(VDF-TrFE) 나노도트를 획득하는 단계 및 P(VDF-TrFE) 나노도트 표면에 상부 전극을 형성하는 단계를 포함하는 것을 특징으로 한다.
Abstract:
PURPOSE: A ferroelectric nano dot device and a manufacturing method thereof are provided to improve storage density by forming a small cell using a PbTiO3 nano dot. CONSTITUTION: A substrate is made of insulating materials. A bottom electrode(102) is formed on the upper side of the substrate. A ferroelectric nano dot is formed on a part of the upper side of the bottom electrode with a spherical shape. The ferroelectric nano dot includes a top electrode(202) and is made of PbTiO3.
Abstract:
PURPOSE: Provided are a thermoresponsive poly(N-isopropylacrylamide)template hybrid particle having a desired size and non-toxicity, thereby being applicable to various field such as the cell cultivation, the separative filler, the drug delivery system and the sensor, and method for preparing the same. CONSTITUTION: The thermoresponsive poly(N-isopropylacrylamide)template hybrid particle is prepared by the method comprising the steps of: fixing an initiator part on and in a spherical template, and subjecting the spherical template having fixed initiator to radical polymerization with a N-isopropylacrylamide monomer so as to a prepare a poly(N-isopropylacrylamide)/template hybrid particle. The poly(N-isopropylacrylamide)/template hybrid particle thus prepared has a diameter of 100-300 m. In the method, the initiator is acryloyl chloride or 2-bromopropionyl bromide, and the template is selected from the group consisting of polysaccharides, silica polymers and gold.
Abstract:
A shikonin is produced by culturing cell or immobilized cell of Lithospermum erythrorhizon KCTC PCL 52001 at 25 deg.C in M-9 medium contg. n-hexadecane as an organic solvent. The cell of L. erythrorhizon is immobilized by using Ca-alginate and 0.1 M calcium chloride soln. The method is useful for separating shikonin easily for the cell culture broth of Lithospermum erythrorhizon and producing shikonin in high yield.