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Yoon, H.,Chang, M.,Jang, J. Wiley - VCH Verlag GmbH & Co. KGaA 2007 Advanced Functional Materials Vol.17 No.3
<P>1D poly(3,4-ethylenedioxythiophene) (PEDOT) nanomaterials, including ellipsoidal nanoparticles, nanorods, and nanotubes, are fabricated via chemical oxidation polymerization in reverse (water-in-oil) microemulsions. The reverse cylindrical micelles are prepared with sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and aqueous FeCl<SUB>3</SUB> solution in hexane. The morphology of the final products is determined by carefully tuning the degree of oxidation potential at the micelle surface. Notably, the fabrication of gram-scale amounts of products is possible under optimized synthetic conditions, suggesting that this methodology is appropriate for the large-scale production of the corresponding nanomaterials. The as-prepared PEDOT nanomaterials are applied to the precise detection of alcohol vapors. The chemical sensors based on the PEDOT nanomaterials present excellent reversibility and reproducibility in response.</P> <B>Graphic Abstract</B> <P>Reverse micelle systems can be employed to obtain 1D nanostructures of poly(3,4-ethylenedioxythiophene) (PEDOT). Ellipsoidal, rodlike, and tubular structures (see figure) have been fabricated by varying the amount of oxidizing agent. The PEDOT nanotubes show a relatively fast response and improved sensitivity as chemical sensors for alcohol vapors. <img src='wiley_img/1616301X-2007-17-3-ADFM200600106-content.gif' alt='wiley_img/1616301X-2007-17-3-ADFM200600106-content'> </P>
Hao Wang,Hong Liu,Jiasheng Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
The oxidation of CO in acidic media is very important. For example, in direct methanol fuel cell, CO tendsto poison the Pt electrode and cause a reduction of cell output power. CO can be removed by oxidation under thecatalysis of Au nanoclusters with an optimal size of 2 nm. However, such small Au clusters tend to be corroded in theacidic media. Here we developed a facile method to solve this problem via hydrophobic carbon coating. The Au@Ccomposite was prepared by reverse microemulsion-hydrothermal method. The hydrophobic carbon can effectivelyavoid the corrosion of gold nanoclusters by an acid environment while catalyzing CO oxidation efficiently.
Synthesis of stable iron oxide nanoparticle dispersions in high ionic media
Ehsan Nourafkan,Maryam Asachi,Hui Gao,Ghulum Raza,Dongsheng Wen 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-
A novel one-pot method was developed in this work to synthesize and disperse nanoparticles in a binarybasefluid. As an example, stable magnetite iron oxide (Fe3O4) dispersions, i.e., nanofluids, were producedin a high ionic media of binary lithium bromide-water using a microemulsion-mediated method. Theeffects of temperature and precursor concentration on morphology and size distribution of producednanoparticles were evaluated. An effective steric repulsion force was provided by the surfacefunctionalization of nanoparticles during the phase transfer, supported by the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The formed nanoparticles exhibited a superior stability againstagglomeration in the presence of high concentrations of lithium bromide, i.e., from 20 to 50 wt.%, whichmake them good candidates for a range of novel applications.
정소은,유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The assembly of nanoparticle within hollow nanoshells provides access into advanced nanohybrids with unique and colligative properties. In this work, an effective solution-based synthetic approach for peapod-shaped Au nanoparticle assembly encapsulated within hollow silica nanotubes (pp multi Au@SiO<sub>2</sub> NTs) is reported. Firstly, onedimensional [multiple Au nanodot] core-[silica] shell nanowires (multi-Au@SiO<sub>2</sub> NWs) are synthesized using reverse microemulsion techniques. A subsequent thermal treatment of multi-Au@SiO<sub>2</sub> NWs in aqueous polyvinylpyrrolidone (PVP) solution results in the formation of pp multi-Au@SiO<sub>2</sub> NTs. Further overgrowth of secondary materials (i.e., Pt) on the Au nanoparticles in pp multi-Au@SiO<sub>2</sub> NTs results in the generation of [Au] core-[Pt] shell (Au/Pt) nanoparticle assemblies surrounded by silica nanotubes (pp multi-Au/Pt@SiO<sub><sub>2</sub></sub> NTs). The resulted nanoparticles can be efficient and selective nanoreactors for targeted applications.
Partial oxidation of butane to syngas using nano-structure Ni/zeolite catalysts
Amir Mosayebi,Reza Abedini 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this study, performance of nano-structure Ni over different zeolite supports in partial oxidation of butane was investigated. First, partial oxidation process was performed without catalyst to evaluation of optimal conditions. For in situ reduction of catalysts, H2 produced from homogenous reaction was used. Catalytic partial oxidation was carried out using nano-structure nickel catalysts supported by ZSM5, mordenite and Y. Each catalyst was synthesized through reverse microemulsion method. The catalysts were characterized by BET surface area, XRD, SEM and TGA. Highest butane conversion ( 89%) observed in the presence of Ni/Y catalyst. Also Ni/Y shows the highest overall selectivity to CO and H2 as the most desired partial oxidation products. Results from TGA showed that the minimum quantity of formatted coke was related to Ni/Y, which confirmed the stability of butane conversion versus time for this catalyst.
Separation of Two Amino Acids by Microemulsion Bulk Liquid Membrane
Alireza Salabat,Fereshteh Dehghani Sanij 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
In this research work the potentialities of microemulsion bulk liquid membrane for the selective transport of L-tryptophan (L-Trp) and L-tyrosine (L-Tyr) are investigated at 298.15 K. Reversed micelle formed by sodium bis(2-ethylhexyl)sulfosuccinate (AOT) in dichloroethane, was used as mobile carrier to transport amino acids between a source and a receiving aqueous phase. The effects of pH, surfactant concentration and initial amino acid concentration on the extraction efficiency and transfer rate of the amino acids were studied. It is verified that for a mixture of two amino acids, L-Trp can be extracted selectively by using this type of the bulk liquid membrane with optimized condition.
Separation of Two Amino Acids by Microemulsion Bulk Liquid Membrane
Salabat, Alireza,Sanij, Fereshteh Dehghani Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
In this research work the potentialities of microemulsion bulk liquid membrane for the selective transport of L-tryptophan (L-Trp) and L-tyrosine (L-Tyr) are investigated at 298.15 K. Reversed micelle formed by sodium bis(2-ethylhexyl)sulfosuccinate (AOT) in dichloroethane, was used as mobile carrier to transport amino acids between a source and a receiving aqueous phase. The effects of pH, surfactant concentration and initial amino acid concentration on the extraction efficiency and transfer rate of the amino acids were studied. It is verified that for a mixture of two amino acids, L-Trp can be extracted selectively by using this type of the bulk liquid membrane with optimized condition.
Facile fabrication of platinum nanodots assembly core-silica shell nanosystems
( Diana ),유효종 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Nanosystems using platinum (Pt) nanodots assembly (multi-Pt nanoparticles, m-Pt) as the core and silica (SiO2) shells were successfully synthesized as m-Pt@SiO2 spherical nanoparticles (NPs) and m-Pt@SiO2 nanochains (NChs) by a reverse microemulsion (water-in-oil) based method. The kinetically controlled reduction of K2PtCl4 by the Brij35 surfactant within reverse micelles, followed by condensation of tetraethyl orthosilicate (TEOS), led to the formation of multi-Pt nanodot core-slica shell systems. The reduction kinetics for the growth of coreshell systems were compared in both the presence of reducing agents and in the absence of supplementary agents, as well as the variation of water-to-surfactant ratio. To assemble Pt nanoparticles within in onedimensional silica matrix for m-Pt@SiO2 NChs, the pH of the reaction media was systematically changed.
Jang, Eue-Soon Korean Chemical Society 2012 대한화학회지 Vol.56 No.4
We successfully synthesized $Fe_3O_4/SiO_2$ nanoparticles with ultrathin silica layer of $1.0{\pm}0.5$ nm that was fine controlled by changing concentration of $Fe_3O_4$. Among various reaction conditions for silica coating, increasing concentration of $Fe_3O_4$ was more effective approach to decrease silica thickness compared to water-to-surfactant ratio control. Moreover, we found that concentration of the 1-octanol is also important factor to produce the homogeneous $Fe_3O_4/SiO_2$ nanoparticles. The present approach could be available to apply on preparation of other core/shell nanoparticles with ultrathin silica layer.