1. Kor /
  2. Eng

Login Join

  1. Kor /
  2. Eng

Login Join

우수성과SAIHST 구성원의 언론보도내용 및 수상내역, 각 연구분야의 우수 학술지에 게재된 논문 등 우수한 성과들을 소개합니다.

[김재윤 교수/ 우수논문] ACS Nano. 2019 Mar 26
No 72
작성자 관리자
등록일 2019/11/08




김재윤 교수

SAIHST 융합의과학과


Impact Factor('18)= 13.903


ACS Nano. 2019 Mar 26;13(3):2773-2785. doi: 10.1021/acsnano.8b06767. Epub 2019 Jan 28.


Bioinspired Design and Fabrication of Polymer Composite Films Consisting

of a Strong and Stiff Organic Matrix and Microsized Inorganic Platelets.

Donghwan Ji, Jaeyun Kim*




Intensive studies on nacre-inspired composites with exceptional mechanical properties based on an organic/inorganic hierarchical layered structure have been conducted; however, integrating high strength, stiffness, and toughness for engineering materials still remains a challenge. We herein report the design and fabrication of polymer composites through a hydrogel-film casting method that allow for building uniformly layered organic/inorganic microstructure. Alginate (Alg) was used for an organic matrix, whose mechanical properties were controlled by Ca2+ cross-linking toward the simultaneously strong, stiff, and tough resultant composite. Alumina (Alu) microplatelets were used for horizontally aligned inorganic phase, and their alignment and interactions with the organic matrix were improved by polyvinylpyrrolidone (PVP) coating on the platelet. The composite film exhibits well-balanced elastic and plastic deformation under tensile stress, leading to high stiffness and toughness, which have not been generally achieved in microplatelet-based composite films developed in previous studies. The synergistic effect of Ca2+ cross-linking and PVP-coated Alu platelets on the mechanical properties improved polymer-platelet interfacial interactions, and platelet alignment is clearly demonstrated through mechanical tests and Fourier transform infrared and X-ray diffraction analyses. We further demonstrate that the reinforcing effect of the Alu platelet and PVP-coated platelet on the mechanical properties is dependent on humidity. Such effects are maximized at highly dry conditions, which is consistent with the model estimation. Furthermore, a thick bulk composite was produced by laminating thin films and showed high mechanical properties under flexural stress. Our design and fabrication strategies combined with the understanding of their mechanism yield an alternative approach to produce engineered composite materials.


KEYWORDS: alginate; hydrogel-film casting; ionic cross-linking; layer-by-layer structure; mechanical properties; nacre-inspired design







이전글 다음글