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- 저자 : Wei-Fan Kuan (검색결과 2 건)
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Chao-Jen Wang,Wei-Fan Kuan,Hui-Ping Lin,Yury A. Shchipunov,Li-Jen Chen 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
In this study, an eco-friendly fabrication process for the hydrophilic polydimethylsiloxane (PDMS)-basedsponge was proposed with the assistance of sugar templates and poly(dimethylsiloxane-b-ethyleneoxide) (PDMS-b-PEO) block copolymer additives. The effects of sugar loadings and sugar particle sizes onsponge structure and separation performance were investigated. Manipulating sugar loadings exhibiteda unique control over the porosity of sponge, which further influenced the absorption capacity and oil–water separation speed. Additionally, the surface modification of PDMS sponge from hydrophobic/oleophilic to hydrophilic/underwater oleophobic was achieved by incorporating PDMS-b-PEO. Suchmodified sponge demonstrated an underwater oil contact angle of 154 and a stable separation efficiencygreater than 99.9% in the gravity-driven cycledfiltration tests. The hydrophilic PDMS-b-PEO modifiedsponges highlighted herein reveal a promising potential for novel separation materials with energyefficientand cost-effective features, which are ideal for oil spill clean-up events and wastewatertreatment application.
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Cho, Whirang,Wu, Jinghang,Shim, Bong Sup,Kuan, Wei-Fan,Mastroianni, Sarah E.,Young, Wen-Shiue,Kuo, Chin-Chen,Epps, III, Thomas H.,Martin, David C. The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.7
<P>We describe the synthesis and characterization of bicontinuous cubic poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymer gels prepared within lyotropic cubic poly(oxyethylene)<SUB>10</SUB> nonylphenol ether (NP-10) templates with <I>Ia</I>3&cmb.macr;<I>d</I> (gyroid, GYR) symmetry. The chemical polymerization of EDOT monomer in the hydrophobic channels of the NP-10 GYR phase was initiated by AgNO<SUB>3</SUB>, a mild oxidant that is activated when exposed to ultraviolet (UV) radiation. The morphology and physical properties of the resulting PEDOT gels were examined as a function of temperature and frequency using optical and electron microscopy, small-angle X-ray scattering (SAXS), dynamic mechanical spectroscopy, and electrochemical impedance spectroscopy (EIS). Microscopy and SAXS results showed that the PEDOT gels remained ordered and stable after the UV-initiated chemical polymerization, confirming the successful templated-synthesis of PEDOT in bicontinuous GYR nanostructures. In comparison to unpolymerized 3,4-ethylenedioxythiophene (EDOT) gel phases, the PEDOT structures had a higher storage modulus, presumably due to the formation of semi-rigid PEDOT-rich nanochannels. Additionally, the storage modulus (<I>G</I>′) for PEDOT gels decreased only modestly with increasing temperature, from ∼1.2 × 10<SUP>5</SUP> Pa (10 °C) to ∼7 × 10<SUP>4</SUP> Pa (40 °C), whereas <I>G</I>′ for the NP-10 and EDOT gels decreased dramatically, from ∼5.0 × 10<SUP>4</SUP> Pa (10 °C) to ∼1.5 × 10<SUP>2</SUP> Pa (40 °C). EIS revealed that the impedance of the PEDOT gels was smaller than the impedance of EDOT gels at both high frequencies (PEDOT ∼10<SUP>2</SUP>Ω and EDOT 2–3 × 10<SUP>4</SUP>Ω at 10<SUP>5</SUP> Hz) and low frequencies (PEDOT 10<SUP>3</SUP>–10<SUP>5</SUP>Ω and EDOT ∼5 × 10<SUP>5</SUP>Ω at 10<SUP>−1</SUP> Hz). These results indicated that PEDOT gels were highly ordered, mechanically stable and electrically conductive, and thus should be of interest for applications for which such properties are important, including low impedance and compliant coatings for biomedical electrodes.</P> <P>Graphic Abstract</P><P>The successful templated-synthesis of PEDOT in bicontinuous GYR nanostructures: highly ordered, mechanically stable and electrically conductive. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp04426f'> </P>
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