전기방사로 제조된 나노섬유를 이용한 생체 모방형 무기 나노 구조체의 합성

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2013.2, [ vii, 62 p. ]Functional inorganic nanostructures have been much attractive for various applications to biosen-sors, catalytic systems, electronic and optical devices. Various porous polymer nanostructures serve as a tem-plate for the formation of inorganic nanostructures. Electrospinning is widely used to produce highly porous nanofiber structures with large surface area-to-volume ratio. Several techniques has been employed to homo-geneously generate inorganic nanostructure on electrospun nanofibers, however, there has a need to a new approach for surface modification of electrospun nanofibers for homogeneously and spontaneously generating inorganic nanostructures under ambient conditions. Recently there has been increasing attention on a mussel-inspired surface modification because of their capability for the coatings of various organic and inorganic materials. It is known that the co-existence of the catechol moiety of 3,4-dihydroxy-L-phenylalanine (DOPA) and the amine group of lysine is crucial for strong mussel adhesion in aqueous environment. Catechol moiety has enough reducing capability for generating metal nanoparticles with a strong adhesive property. Here we introduce a mussel-inspired surface modification for inorganic coatings of electrospun pol-ymer nanofibers. Firstly, catechol-grafted polymer nanofibers are used as a functional template for the for-mation of noble metal nanostructures. The synthesis of metal nanostructures is driven by the oxidation of the catechol moiety having an enough reducing potential for metal ions. 3,4-dihydroxyhydrocinnamic acid is chemically grafted to poly(vinylalcohol) (PVA) using ethylenediamine as a linker, producing catechol-grafted PVA (PVA-g-ct). Noble metal ions (e.g., Ag+, Au3+ and Pt4+) are spontaneously reduced to metal nanoparticles on electrospun PVA-g-ct nanofibers. The highly open porous, three-dimensional metal nanostructures are generated when the catechol-grafted nanofibers are simply immersed in metal ion precur...한국과학기술원 : 신소재공학과

ROS-inhibiting, UV-screening composite particles and the use thereof

본 발명은 자외선 차단용 복합분체 및 이의 응용에 관한 것이다. 구체적으로 본 발명에 따르면, 광반응으로부터 유발되는 활성산소의 억제능에 현저한 시너지를 제공할 수 있으며, 향상된 UV 산란 특성과 더불어 자외선 차단 효과에 현저성을 부여할 수 있다. 이에, 보다 넓은 범위의 자외선 영역에 대한 우수한 차단효과의 구현을 필요로 하는 자외선 차단용 화장품 소재, 도료 소재 등과 같은 다양한 양태로 적용될 수 있을 것으로 기대된다