• Title/Summary/Keyword: Layer-by-layer self-assembly

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Layer-by-layer self-assembly colorant multi-layer preparation using natural colorant Berberine and anionic polyelectrolyte (베르베린 천연색소화합물과 음이온고분자전해질을 이용한 layer-by-layer self-assembly 색소다층박막 제조)

  • Son Young-A;Park Young-Min;Lee Seung-Goo;Ravikumar K.
    • Textile Coloration and Finishing
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    • v.18 no.1
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    • pp.28-32
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    • 2006
  • A multi-layer of the dye, natural colorant Berberine, was successfully developed by the self-assembly deposition from water-soluble cationic dye(Berberine chloride) and anionic polyelectrolyte PSS(Polysodium 4-styrenesulfonate) in aqueous solution via electrostatic attraction. The corresponding results on multi-layer were characterized by UV-Vis absorbance measurements. The growth of multi-layer formed by the sequential interaction was also determined. The findings measured by UV-Vis spectrophotometer showed that the bilayer deposition characteristic was linear and highly reproducible from layer to layer.

Fabrication of Ultrathin Multilayer Films Using Layer-by-Layer Self-Assembly Method and Their Application (Layer-by-Layer 자기조립현상을 이용한 다층초박막의 제조와 응용)

  • 차국헌;조진한
    • Polymer Science and Technology
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    • v.15 no.3
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    • pp.260-273
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    • 2004
  • Layer-by-layer 자기조립방법 (self-assembly method) 이라고 불리는 담지자기조립방법 (dip self-assembly method)을 이용한 다층초박막은 다양한 전기적, 자기적 성질을 갖는 물질뿐만 아니라 DNA 또는 효소 (enzyme)같은 바이오 물질들을 기판의 크기나 형태에 관계없이 각각의 층에 나노미터 두께로 삽입시킬 수 있음에 따라서 초박막안에 우리가 원하는 특정 성질을 부여할 수 있다. (중략)

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Preparation of Gold Nanoisland Arrays from Layer-by-Layer Assembled Nanoparticle Multilayer Films

  • Choi, Hyung-Y.;Guerrero, Michael S.;Aquino, Michael;Kwon, Chu-Hee;Shon, Young-Seok
    • Bulletin of the Korean Chemical Society
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    • v.31 no.2
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    • pp.291-297
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    • 2010
  • This article introduces a facile nanoparticle self-assembly/annealing method for the preparation of nanoisland films. First, nanoparticle-polymer multilayer films are prepared with layer-by-layer assembly. Nanoparticle multilayer films are then annealed at $~500^{\circ}C$ in air to evaporate organic matters from the films. During the annealing process, the nanoparticles on the solid surface undergo nucleation and coalescence, resulting in the formation of nanostructured gold island arrays. By controlling the overall thickness (number of layers) of nanoparticle multilayer films, nanoisland films with various island density and different average sizes are obtained. The surface property of gold nanoisland films is further controlled by the self-assembly of alkanethiols, which results in an increased surface hydrophobicity of the films. The structure and characteristics of these nanoisland film arrays are found to be quite comparable to those of nanoisland films prepared by vacuum evaporation method. However, this self-assembly/annealing protocol is simple and requires only common laboratory supplies and equipment for the entire preparation process.

Direct Coloration using Self-assembly Fabrication Method on PET Fibers - Surface diazo coupling reaction -

  • Kim, Byung-Soon;Son, Young-A
    • Textile Coloration and Finishing
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    • v.19 no.5
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    • pp.37-40
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    • 2007
  • The electrostatic layer-by-layer technique provides a convenient way to control the construction of ultrathin films at nano-scale ranges and can be easily obtained. It can be also applicable to fiber substrate with dye compounds. We have fabricated multilayer dye films using diazonium resin and three couplers, which are prepared by self-assembly approach. This method is based on layer-by-layer deposition using electrostatic attraction between oppositely charged ions. Beside, the diazo coupling reaction proceeded to form azo dye layer on the PET fibers the same time. The corresponding results of the multilayer films have been discussed on the level of color strength (K/S).

Ordered Hybrid Nanomaterials from Self-Assembled Polymeric Building Blocks

  • Kim, Dong-Ha
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.309-309
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    • 2006
  • Latest developments on hybrid nanostructured materials fabricated by applying self-assembly strategies on organic/inorganic nanotemplates are discussed. Within this frame, numerous functional nanomaterials including arrays of composite metal/semiconductor nanoparticles, planar waveguides and functional multilayer thin films are generated using self-assembled polymers as templates or building blocks. In particular, surface plasmon resonance based optical sensing is employed to investigate nanofabrication processes occurring in nanoscale dimention. We also suggest unprecedented pathways to hybrid supramolecular multilayer nanoarchitectures in 1D or 2D geometry via layer-by-layer self-assembly.

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Technology Trend of surface Wettability Control Using Layer-by-Layer Assembly Technique (다층박막법을 이용한 표면 젖음성 제어 기술 동향)

  • Sung, Chunghyun
    • Journal of Adhesion and Interface
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    • v.18 no.4
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    • pp.171-178
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    • 2017
  • Recently, layer-by-layer (LbL) assembly has emerged as a promising fabrication technique in controlling surface wetting properties. LbL assembly technique is eco-friendly versatile technique to control the hierarchical structure and surface properties in nano- and micro-scale by employing a variety of materials (e.g., polymers, surfactants, nanoparticles, etc.). This article reviews recent progress in controlling the surface wetting using LbL technique. In particular, technical trends and research findings on fabrication and the applications of superhydrophobic, superhydrophilc, and superoleophobic/superhydrophilic LbL surfaces are extensively explained. Additionally, basic principles and fabrication methods in emerging areas such as omniphobic, self-healing, intelligent and responsive LbL surfaces are discussed.

Surface Plasmon Resonance Immunosensor for Detection of Legionella pneumophila

  • Oh, Byung-Keun;Lee, Woochang;Bae, Young-Min;Lee, Won-Hong;Park, Jeong-Woo
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.8 no.2
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    • pp.112-116
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    • 2003
  • An immunosensor based on surface plasmon resonance (SPR) onto a protein G layer by Self-assembly technique was developed for detection of Legionella pneumophila. The protein G layer by self-assembly technique was fabricated on a gold (Au) surface by adsorbing the 11-mercaptoundecanoic acid (MUA) and an activation process for the chemical binding of the free amino (-NH$_2$) of protein G and 11-(MUA) using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDAC) in series. The formation of the protein G layer by self-assembly technique on the Au Substrate and the binding of the antibody and antigen in series were confirmed by SPR spectroscopy. The Surface topographies of the fabricated thin films on an Au substrate were also analyzed by using an atomic force microscope (AFM). Consequently, an immunosensor for the detection of L. pneumophila using SPR was developed with a detection limit of up to 10$^2$CFU per mL.

Self-assembly Coloration Approach on Cotton Fibers using Porphyrin

  • Kim, Byung-Soon;Li, Xiachuan;Kim, Sung-Hoon;Bae, Jin-Seo;Son, Young-A
    • Textile Coloration and Finishing
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    • v.20 no.5
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    • pp.23-27
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    • 2008
  • In this work, poly(diallyldimethylammoniumchloride) (PDDAC) and meso-tetrakis(4-carboxyphenyl)porphyrin were considered to produce the self-assembly fabrication films. This method is based on the layer-by-layer (LbL) deposition produced by the electrostatic attraction between positively charged PDDAC and negatively charged porphyrin ions. The result of multilayer fabrication was discussed with the level of color strength (K/S). K/S spectra of the fabricated multilayer films showed gradual increase behaviors. In addition, the color photo images of the fabricated multilayer films showed that PDDAC and porphyrin were successfully attracted by electrostatic self-assembly forces.

Deposition of an Intermediate Layer on an Ultrapermeable Ceramic Support by Evaporation-Driven Self-Assembly (증발유도 자기조립을 이용한 고투과도 세라믹 지지체의 중간층 제조)

  • Kwon, Hyuk Taek;Kim, Jinsoo
    • Membrane Journal
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    • v.31 no.1
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    • pp.80-85
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    • 2021
  • In this study, we developed an evaporation-driven self-assembly coating method for an ceramic intermediate layer on an ultrapermeable ��-Al2O3 support with large pore size of ~1.5 ㎛. The method led to the formation of a ceramic intermediate layer with higher surface homogeneity and less surface roughness than the conventional dip-coating method. A mesoporous ��-Al2O3 layer was deposited on the support to evaluate support quality. A supported ��-Al2O3 membrane was defect-free even without repeated coating. Furthermore, the membrane showed 2.3 times higher nitrogen permeance than one prepared on a macroporous support with pore size range of 100~200 nm, which is widely used for ceramic membrane coating.