Spin-Coating Self-Assembly for Micropatterning of Ultrathin Multilayer Films

2003 ◽  
Vol 775 ◽  
Author(s):  
Hongseok Jang ◽  
Sangcheol Kim ◽  
Kookheon Char
Keyword(s):  
Ultrathin Films ◽  
Self Assembly ◽  
Multilayer Films ◽  
Process Time ◽  
Microfluidic Channels ◽  
Layer By Layer ◽  
New Approach ◽  
High Line ◽  
Spinning Process ◽  
Distinct Line

AbstractA new approach to create layer-by-layer assembled multilayer ultrathin films with welldefined micropatterns in a short process time is introduced. To achieve such micropatterns with high line resolution in organic multilayer films, microfluidic channels were combined with the convective self-assembly process employing both hydrogen bonding and electrostatic intermolecular interactions. The channels were initially filled with polymer solution by capillary pressure and the residual solution was then removed by spinning process. The micropatterns with distinct line boundaries were obtained and the small ridges were also observed at the edges of the patterned lines. Spin self-assembled vertical heterostructural multilayer patterning using (PVP/PAA)5 micropatterns, which were prepared with microfluidic channels, as a template was also investigated.

CHARACTERISTICS AND MICROPATTERNING OF SPIN SELF-ASSEMBLED ULTRATHIN MULTILAYERS

2002 ◽  
Vol 01 (05n06) ◽  
pp. 375-381 ◽  
Author(s):  
KOOKHEON CHAR ◽  
SANGCHEOL KIM ◽  
JINHAN CHO ◽  
HIESANG SOHN ◽  
HONGSEOK JANG
Keyword(s):  
Self Assembly ◽  
Multilayer Films ◽  
Viscous Force ◽  
Process Time ◽  
Microfluidic Channels ◽  
Weakly Bound ◽  
New Approach ◽  
Polyelectrolyte Layer ◽  
Spinning Process ◽  
Oppositely Charged

A new method is introduced to build organic/organic multilayer films composed of cationic poly(allylamine hydrochloride) (PAH) and negatively-charged poly(sodium 4-styrenesulfonate) (PSS) using the spinning process. The adsorption process is governed by both the viscous force induced by fast solvent elimination and the electrostatic interaction between oppositely-charged species. On the other hand, the centrifugal and air shear forces applied by the spinning process enhance significantly the desorption of weakly-bound polyelectrolyte chains and also induce the planarization of the adsorbed polyelectrolyte layer. The surface of the multilayer films prepared with the spinning process is quite homogeneous and smooth. Also, a new approach to create multilayer ultrathin films with well-defined micropatterns in short process time is introduced. To achieve such micropatterns with high line resolution in organic multilayer films, microfluidic channels were combined with the convective self-assembly process employing both hydrogen bonding and electrostatic intermolecular interactions. As a next step, we extended the spin SA to the fabrication of multilayer micropatterns with vertical heterostructure.

Self-assembly layer-by-layer fabrication using porphyrin dye anion and polycation

2009 ◽  
Vol 13 (07) ◽  
pp. 774-778 ◽  
Author(s):  
Byung-Soon Kim ◽  
Young-A Son
Keyword(s):  
Ultrathin Films ◽  
Self Assembly ◽  
Film Surface ◽  
Layer By Layer ◽  
Preparation Technique ◽  
Force Microscopy ◽  
Atomic Force ◽  
Diallyldimethylammonium Chloride ◽  
Afm Analysis ◽  
Progressive Growth

In this study, self-assembled alternating film using poly(diallyldimethylammonium chloride) (PDDAC) and meso-tetrakis(4-carboxyphenyl)porphyrin (MTCP) was prepared as a multilayer deposition on glass substrate. This preparation technique for dye deposition may provide new feasibilities to achieve the manufacture of ultrathin films for nanotechnology application. The deposition films were characterized by UV-vis spectrophotometer and Atomic Force Microscopy (AFM) analysis. The results of UV-vis spectra showed that the absorbance characteristic of the multilayer films linearly increased with an increased number of PDDAC and MTCP bilayers. AFM analysis showed the film surface was relatively uniform and the progressive growth of layers was determined.

Layer-by-layer self-assembly of multilayer films based on humic acid

2011 ◽  
Vol 519 (13) ◽  
pp. 4324-4328 ◽  
Author(s):  
Zhengxia Xu ◽  
Chenyang Hu ◽  
Hu Guoxin
Keyword(s):  
Humic Acid ◽  
Self Assembly ◽  
Multilayer Films ◽  
Layer By Layer

Construction of multilayer films with bactericidal and long-term antitumor drug release properties as a non-vascular stent coating for therapy in obstruction

2019 ◽  
Vol 7 (32) ◽  
pp. 4963-4972 ◽  
Author(s):  
Xiao-yan Xu ◽  
Yan-fang Chen ◽  
Qing-gang Tan ◽  
Zhi-jie Chen ◽  
Yan Li ◽  
...  
Keyword(s):  
Drug Release ◽  
Self Assembly ◽  
Multilayer Films ◽  
Antitumor Drug ◽  
Layer By Layer ◽  
Vascular Stent ◽  
Assembly Method ◽  
Stent Coating

An antibacterial and antitumor coating for non-vascular stent was constructed via the layer-by-layer electrostatic self-assembly method.

scholarly journals Fabrication and Characterization of Antibacterial-active Multilayer Films Based on Keggin Polyoxometalates and Methylene Blue

2010 ◽  
Vol 65 (2) ◽  
pp. 140-146 ◽  
Author(s):  
Dan Chen ◽  
Jun Peng ◽  
Haijun Pang ◽  
Pengpeng Zhang ◽  
Yuan Chen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Self Assembly ◽  
Multilayer Films ◽  
Photoelectron Spectra ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Assembly Technique ◽  
Lbl Films ◽  
Cv Measurements

Two kinds of multilayer films based on Keggin polyoxometalates α-[SiW12O40]4−/α- [PMo12O40]3− and methylene blue have been prepared via the layer-by-layer (LBL) self-assembly technique. The multilayer films were characterized by UV/Vis spectra, atomic force microscopy (AFM) and X-ray photoelectron spectra (XPS). The cyclic voltammetry (CV) measurements have demonstrated that the electrochemical properties of POMs are maintained in the LBL films. The antibacterial activity of the LBL films has also been investigated, which shows a distinct antibacterial effect against Escherichia coli.

Fabrication of Multilayer Films Using a Spinning Process

2000 ◽  
Vol 648 ◽  
Author(s):  
Jinhan Cho ◽  
Kookheon Char ◽  
Jong-Dal Hong ◽  
Ki-Bong Lee
Keyword(s):  
Film Thickness ◽  
Thin Layer ◽  
Ultrathin Films ◽  
Multilayer Films ◽  
Cds Nanoparticles ◽  
Adsorption Time ◽  
X Ray ◽  
Spinning Process ◽  
Allylamine Hydrochloride ◽  
Spinning Speed

AbstractWe introduce a method to build up organic/organic and organic/inorganic multilayer films composed of cationic poly(allylamine hydrochloride) (PAH) and negatively charged poly(sodium 4-styrenesulfonate) (PSS) or inorganic cadmium sulfide (CdS) nanoparticles using a spinning process. Since the deposition of each layer is made at a high spinning speed, the adsorption time for the formation of a homogeneous thin layer takes only 8 to 15 seconds. The adsorbed film thickness per bilayer can be easily controlled from about 5Å to 40Å by varying the spinning speed (Ω) and the mole concentration of polyelectrolytes. We also demonstrated with X-ray reflectivity that the alternating organic/inorganic ultrathin films fabricated by the spin SA process retain highly ordered internal structure in comparison with those prepared by the conventional SA process.

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