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- 주제어 : Honeycomb-patterned film (검색결과 9 건)
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Won Jung Kim,Do Sung Huh 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
Conductive honeycomb-patterned polystyrene (PS) thin films were prepared by the formation of a polyaniline (PANI) thin layer on the surface of the patterned PS thin films using simple one-step chemical oxidative polymerization of aniline. The in situ chemical oxidation polymerization of aniline hydrochloride solution on the patterned structure of the PS films was conducted in the presence of multiwalled carbon nanotubes (MWCNT) to prepare the PANI-MWCNT/PS composite film. The concentration (wt %) of MWCNT was varied in the range of 1%-3% by weight. The dependence of surface morphology of the PANI/PS and PANIMWCNT/ PS composite film to the polymerization time was observed by scanning electron microscopy. The room temperature DC conductivity was obtained by the four-probe technique. The conductivity of the PANIMWCNT/ PS composite film was affected both by the MWCNT concentration and polymerization time. In addition, DC electrical field was loaded during the oxidative polymerization to affect the distribution of the MWCNT included in the composite film, varying the loading voltage in the range of 0.1-3.0 V. The conductivity of the PANI-MWCNT/PS composite film was increased as loading voltage rose. However, this increase stops at a voltage higher than the critical value.
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Kim, Young Woo,Modigunta, Jeevan Kumar Reddy,Male, Umashankar,Huh, Do Sung Elsevier 2019 Polymer Vol.166 No.-
<P><B>Abstract</B></P> <P>Honeycomb-patterned (HCP) porous polystyrene (PS) film was fabricated by the breath figure method with inclusion of ferrocene in the PS solution for silver (Ag)-functionalization. Ag-functionalized HCP porous PS film was obtained by immersing the fabricated film in aqueous silver nitrate solution through interfacial reduction by ferrocene. The addition of ferrocene in the polymer solution also affected the morphology of the HCP porous film during the fabrication process. Depending on the used ferrocene concentration, morphology of the obtained Ag morphology on the film surface was different. By increasing the ferrocene concentration the reduced silver particles changed to silver nanowire without much aggregation and also increased the conductivity of the films. This method of silver-functionalization on the polymer film unleashes the futuristic applications in interdisciplinary fields such as substrates for Raman scattering and antibacterial studies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Honeycomb patterned porous polystyrene films were fabricated by adding ferrocene. </LI> <LI> Addition of ferrocene to polystyrene solution affected the morphology of the films. </LI> <LI> Ferrocene amount in polystyrene films changed the morphology of Ag reduced on it. </LI> <LI> Polystyrene films functionalized with Ag nanowires showed higher conductivity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Kim, Won-Jung,Huh, Do-Sung Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
Conductive honeycomb-patterned polystyrene (PS) thin films were prepared by the formation of a polyaniline (PANI) thin layer on the surface of the patterned PS thin films using simple one-step chemical oxidative polymerization of aniline. The in situ chemical oxidation polymerization of aniline hydrochloride solution on the patterned structure of the PS films was conducted in the presence of multiwalled carbon nanotubes (MWCNT) to prepare the PANI-MWCNT/PS composite film. The concentration (wt %) of MWCNT was varied in the range of 1%-3% by weight. The dependence of surface morphology of the PANI/PS and PANI-MWCNT/PS composite film to the polymerization time was observed by scanning electron microscopy. The room temperature DC conductivity was obtained by the four-probe technique. The conductivity of the PANI-MWCNT/PS composite film was affected both by the MWCNT concentration and polymerization time. In addition, DC electrical field was loaded during the oxidative polymerization to affect the distribution of the MWCNT included in the composite film, varying the loading voltage in the range of 0.1-3.0 V. The conductivity of the PANI-MWCNT/PS composite film was increased as loading voltage rose. However, this increase stops at a voltage higher than the critical value.
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Kim, J.K.,Basavaraja, C.,Umashankar, M.,Huh, D.S. IPC Science and Technology Press 2016 Polymer Vol.87 No.-
Novel biocompatible poly(@?-caprolactone) (PCL) was synthesized via in situ ring-opening polymerization of @?-caprolactone under different concentrations (10, 20, and 30 wt%) of capped magnetic nanoparticles (CMPs). The prepared PCL/CMP composites were characterized using Fourier transform infrared, UV-vis spectra, and X-ray photoelectron spectroscopy to demonstrate the interaction between PCL and CMP. X-ray diffraction patterns, scanning electron microscopy with energy dispersive X-ray spectroscopy, and thermogravimetric analysis were used to understand the structural nature and thermal stability of the polymer composites. Honeycomb-patterned thin films were fabricated by casting the composite solutions under humid conditions. The I-V characteristics and magnetic behavior of the honeycomb-patterned films were observed and compared with those of the flat thin composite films. The honeycomb-patterned PCL/CMP composite films revealed higher conductivity than the flat films and showed a hysteresis loop in the magnetization plotted against the applied magnetic field for magnetic behavior.
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Kim, Kwang Il,Basavaraja, C.,Huh, Do Sung Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
The photocontrolled reduction of silver nitrate to silver (Ag) nanoparticles on honeycomb-patterned poly(N-vinylcarbazole) (PVK)-cellulose triacetate (CTA) composite thin films was studied. The composites were prepared via the oxidative polymerization of N-vinylcarbazole with ferric chloride using different CTA concentrations. A honeycomb-patterned film was fabricated by casting the composite solution under humid conditions. Ag particles with a homogeneous distribution were produced by the composite film in a moderate CTA concentration, whereas aggregated Ag was obtained from the pure PVK film.
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김광일,바사바,허도성 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
The photocontrolled reduction of silver nitrate to silver (Ag) nanoparticles on honeycomb-patterned poly(Nvinylcarbazole) (PVK)-cellulose triacetate (CTA) composite thin films was studied. The composites were prepared via the oxidative polymerization of N-vinylcarbazole with ferric chloride using different CTA concentrations. A honeycomb-patterned film was fabricated by casting the composite solution under humid conditions. Ag particles with a homogeneous distribution were produced by the composite film in a moderate CTA concentration, whereas aggregated Ag was obtained from the pure PVK film.
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Cao, Thuy Thi,Male, Umashankar,Huh, Do Sung Elsevier 2018 Polymer Vol.153 No.-
<P><B>Abstract</B></P> <P>Carboxyl group functionalization in honeycomb-patterned porous (HCP) films was obtained by breath figure process using polyimide (PI) which can react with KOH humidity at the polymer solution/aqueous alkali droplet interface to form carboxyl groups. PI containing CO-NR<SUB>2</SUB> imide ring group reacts with KOH for imide ring-cleavage reaction by interfacial reaction. In order to obtain pore-selective carboxyl group functionalized PI HCP films, we have suggested a new strategy introducing KOH humidity with time interval after using initial water humidity during breath figuring process. The carboxyl group functionalized pores can be applied to obtain ordered microarray of biological and inorganic materials, which have potential applications in biosensors, separations, medical biology, etc.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new strategy was developed for the pore selective carboxyl functionalization. </LI> <LI> Polyimide reacts with KOH humidity to form carboxyl functionalized porous films. </LI> <LI> Pore functionalization was enhanced by delayed introduction of KOH humidity. </LI> <LI> Reactive carboxyl pores can be used as a template for further functionalization. </LI> <LI> Silver functionalized porous polyimide films by ion-exchange self-metallization. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Kim, J.K.,Kim, K.I.,Huh, D.S. North-Holland 2014 Materials letters Vol.132 No.-
Biocompatible composites containing poly(ε-caprolactone) (PCL) were prepared by incorporating different weight percentages of silver (Ag) nanoparticles with the particle size of about 10nm modified by dodecanethiol. The synthesized PCL/Ag composites were characterized by Fourier transform infrared and UV-vis spectroscopy, and the surface morphology of these composites was identified by scanning electron microscopy and transmission electron microscopy. Honeycomb-patterned thin films with the film thickness of 20-30μm was fabricated by casting the composite solution under humid conditions without separation of Ag nanoparticles due to the chemical modification. The dependence of the DC conductivity and pattern structure of the thin films on Ag concentration was studied.
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Male, U.,Jo, E.J.,Park, J.Y.,Huh, D.S. IPC Science and Technology Press 2016 Polymer Vol.99 No.-
We present a new and facile strategy for the fabrication of conducting honeycomb-patterned porous films through interfacial polymerization. Polymer solutions containing poly(ε-carprolactone) (PCL) and benzoyl peroxide (BPO) in chloroform was fabricated under high humid conditions to obtain PCL-BPO honeycomb patterned films. The films were treated with aqueous aniline hydrochloride solution to polymerize aniline at the interface of the PCL film and aniline hydrochloride solution. PCL-BPO films served dual role of a template as well as an oxidant. The proposed strategy retains the electrical conductivity of polyaniline as well as the mechanical strength and biodegradable properties of PCL. In contrast with in-situ templated bulk polymerization methods, the proposed method exhibits the advantage of retaining porosity without causing any wreckage.
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