Kim BH  Lee DH  Kim JY  Shin DO  Jeong HY  Hong S  Yun JM  Koo CM  Lee H  Kim SO 《Advanced materials (Deerfield Beach, Fla.)》2011,23(47):5618-5622

Mussel-inspired interfacial engineering is synergistically integrated with block copolymer (BCP) lithography for the surface nanopatterning of low surface energy substrate materials, including, Teflon, graphene, and gold. The image shows the Teflon nanowires and their excellent superhydrophobicity.  相似文献   

    

Tuan-Anh Nguyen  Tae-Sun Jun  Muhammad Rashid  Yong Shin Kim 《Materials Letters》2011,65(17-18):2823-2825

Mesoporous tungsten oxide nanofibers were synthesized via a 500 °C thermal treatment of composite nanofibers prepared by electrospinning an ethanol solution consisting of tungsten ethoxide, P123 triblock copolymer, and polyvinylpyrrolidone. The as-electrospun composites exhibited unwoven nanofibers with an average diameter of 233 nm and a smooth surface morphology. During the calcination process, the composite nanofibers were shrunk to 85 nm in diameter and converted into rough, wormhole-like nanofibers. These were formed by agglomerating polycrystalline WO₃ particles of 10–30 nm along the axial direction. Furthermore, a measured pore-size distribution indicated that this nanofiber mat had different types of meso-sized porosities, which may have resulted from their wormhole-like structures and inter-fiber voids. In addition, it was observed to have the intra-grain porosity with the diameter of about 1.0 nm.  相似文献   

    

Hae-Hyoung Lee  Ueon Sang Shin  Jong-Eun Won  Hae-Won Kim 《Materials Letters》2011,65(2):208-211

Here we report a simple preparation of composite nanopowders made of hydroxyapatite (HA) and carbon nanotube (CNT). In particular, CNTs were ionically modified to dissolve homogeneously in a series of organic solvents, including tetrahydrofuran and ethanol. The addition of HA nanopowders within the CNTs solution resulted in rapid precipitation of the composite HA-CNTs nanopowders. High resolution electron image revealed individual CNTs were evenly distributed within the cluster of HA nanoparticulates. A maximal concentration of CNTs to be organized within the HA nanopowder was highly dependent on the physicochemical characteristics of HA powders. A pilot biological assessment of the composite powders demonstrated favorable adhesion and growth of tissue cells. The developed HA-CNTs composite nanopowders may be potentially useful as an initial powder source for HA-CNT nanocomposites or coatings in biomedical applications.  相似文献   

    

Seung Koo Lee  Myung Shin Han  Ching‐Hsuan Tung 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(21):3315-3320

A long‐lasting particle‐based fluorescent label is designed for extended cell imaging studies. This onion‐like nanoprobe is constructed through layer‐by‐layer fabrication technology. The nanoprobes are assembled with multiple layers of optically quenched polyelectrolytes, the fluorescence signal of which can be released later by intracellular proteolysis. Upon incubation with cells, the assembled nanoprobes are taken up efficiently. The tight packing and layered assembly of the quenched polyelectrolytes slow subsequent intracellular degradation, and then result in a prolonged intracellular fluorescence signal for up to 3 weeks with no noticeable toxicity.  相似文献   

    

Sang‐Hee K. Park  Chi‐Sun Hwang  Minki Ryu  Shinhyuk Yang  Chunwon Byun  Jaeheon Shin  Jeong‐Ik Lee  Kimoon Lee  Min Suk Oh  Seongil Im 《Advanced materials (Deerfield Beach, Fla.)》2009,21(6):678-682

  相似文献   

    

Su Ryon Shin  Kyeong Sik Jin  Chang Kee Lee  Sun I. Kim  Geoffrey M. Spinks  Insuk So  Ju‐Hong Jeon  Tong Mook Kang  Ji Young Mun  Sung‐Sik Han  Moonhor Ree  Seon Jeong Kim 《Advanced materials (Deerfield Beach, Fla.)》2009,21(19):1907-1910

  相似文献   

    

Moon‐Kyun Shin  Gyung‐Jin Park 《International journal for numerical methods in engineering》2005,64(5):599-617

Optimization has been successfully applied to systems with a single discipline. Since many disciplines are involved in a coupled fashion in modern engineering, multidisciplinary design optimization (MDO) technology has been developed. MDO algorithms are designed to solve the coupled aspects generated from the interdisciplinary relationship. In a general MDO algorithm, a large design problem is decomposed into smaller ones which can be easily solved. Although various methods have been proposed for MDO, research is still in the early stage. This study proposes a new MDO method which is named MDO based on independent subspaces (MDOIS). Many real engineering problems consist of physically separate components and they can be independently designed. The inter‐relationship occurs through coupled physics. MDOIS is developed for such problems. In MDOIS, a large system is decomposed into small subsystems. The coupled aspects are solved via system analysis which solves the coupled physics. The algorithm is mathematically validated by showing that the solution satisfies the Karush–Kuhn–Tucker condition. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

    

Gunho Jo  Woong‐Ki Hong  Jung Inn Sohn  Minseok Jo  Jiyong Shin  Mark E. Welland  Hyunsang Hwang  Kurt E. Geckeler  Takhee Lee 《Advanced materials (Deerfield Beach, Fla.)》2009,21(21):2156-2160

  相似文献   

    

Jinseob Shin  Kyomin Shin  Hanna Lee  Jeong‐Beom Nam  Jae‐Eun Jung  Jee‐Hyun Ryu  Joo‐Hyun Han  Kyung‐Do Suh  Yong‐Jin Kim  Jongwon Shim  Junoh Kim  Sang‐Hoon Han  Kookheon Char  Yeon Kyung Kim  Jin Ho Chung  Min Jung Lee  Byeong Cheol Kang  Jin‐Woong Kim 《Advanced materials (Deerfield Beach, Fla.)》2010,22(6):739-743

  相似文献   

    

Bong Hoon Kim  Dong Ok Shin  Seong‐Jun Jeong  Chong Min Koo  Sang Chul Jeon  Wook Jung Hwang  Sumi Lee  Moon Gyu Lee  Sang Ouk Kim 《Advanced materials (Deerfield Beach, Fla.)》2008,20(12):2303-2307

  相似文献