Spin-coated ultrathin multilayers and their micropatterning using microfluidic channels

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Jang, Hongseok; Kim, Sangcheol; Cho, Jinhan; Char, Kookheon
Issue Date
한국유변학회 = The Korean Society of Rheology;
The Australian Society of Pheology
Korea-Australia Rheology Journal 15, 1
spin self-assembly methodmultilayerelectrostatic attractionhydrogen bondingmicropatternmicrofluidic channelconvective self-assembly
A new method is introduced to build up 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 significantly enhances desorption of weakly
bound polyelectrolyte chains and also induce the planarization of the adsorbed polyelectrolyte layer. The
film thickness per bilayer adsorbed by the conventional dipping process and the spinning process was found
to be about 4 Å and 24 Å, respectively. 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 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 the spinning process.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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