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ChemSusChem 24건

  1. [해외논문]   Cover Picture: Charge‐ and Size‐Selective Molecular Separation using Ultrathin Cellulose Membranes (ChemSusChem 20/2016)   SCI SCIE

    Puspasari, Tiara (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Yu, Haizhou (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Peinemann, Klaus‐ (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Viktor
    ChemSusChem v.9 no.20 ,pp. 2871 - 2871 , 2016 , 1864-5631 ,

    초록

    The Cover picture shows a 10 nm thick composite membrane made from cellulose that is capable of precisely sieving molecules (with a perfect discrimination of anionic over neutral molecules) at remarkably high flux. The membrane was prepared using trimethylsilyl cellulose (TMSC) as a precursor, providing estimated pore size between 1.5–3.5 nm depending on regeneration period and initial TMSC layer thickness. This is one of the best separation performances ever achieved when using cellulose membranes. More details can be found in the Communication by Puspasari et al. on page 2908 in Issue 20, 2016 (DOI: 10.1002/cssc.201600791).

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  2. [해외논문]   Inside Cover: Photocatalytic Carbon Dioxide Reduction at p‐Type Copper(I) Iodide (ChemSusChem 20/2016)   SCI SCIE

    Baran, Tomasz (Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland) , Wojtyła, Szymon (Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland) , Dibenedetto, Angela (Department of Chemistry, University of Bari, Orabona, 4, 70125, Bari, Italy) , Aresta, Michele (CIRCC, Via Celso Ulpiani, 27, 70126, Bari, Italy) , Macyk, Wojciech (Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland)
    ChemSusChem v.9 no.20 ,pp. 2872 - 2872 , 2016 , 1864-5631 ,

    초록

    The Inside cover picture shows the concept of using p‐type semiconductors as photocatalysts for carbon dioxide conversion into chemicals and fuels. Although p‐ and n‐type semiconductors are mainly considered as basic components used in electronics, the distinction between these two types of semiconductors may also be crucial for photocatalysis. The paper demonstrates that p‐type semiconductors (e.g., CuI) may appear more efficient in photocatalytic CO 2 reduction processes than n‐type materials (e.g., TiO 2 ), usually very efficient in photooxidation reactions. More details can be found in the Full Paper by Baran et al. on page 2933 in Issue 20, 2016 (DOI: 10.1002/cssc.201600289).

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  3. [해외논문]   Charge‐ and Size‐Selective Molecular Separation using Ultrathin Cellulose Membranes   SCI SCIE

    Puspasari, Tiara (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Yu, Haizhou (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Peinemann, Klaus‐ (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Viktor
    ChemSusChem v.9 no.20 ,pp. 2873 - 2873 , 2016 , 1864-5631 ,

    초록

    Abstract Invited for this month′s cover are Klaus‐V. Peinemann and his co‐workers at the King Abdullah University of Science and Technology (KAUST). The image shows the separation performance of a 10 nm thin cellulose membrane. The Communication itself is available at 10.1002/cssc.201600791.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [해외논문]   Spotlights on our sister journals: ChemSusChem 20/2016   SCI SCIE


    ChemSusChem v.9 no.20 ,pp. 2874 - 2877 , 2016 , 1864-5631 ,

    초록

    Abstract Invited for this month′s cover are Klaus‐V. Peinemann and his co‐workers at the King Abdullah University of Science and Technology (KAUST). The image shows the separation performance of a 10 nm thin cellulose membrane. The Communication itself is available at 10.1002/cssc.201600791.

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    무료다운로드 유료다운로드

    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   Charge Transport in Two‐Photon Semiconducting Structures for Solar Fuels   SCI SCIE

    Liu, Guohua (Department of Micro and Nano Systems Technology, University College of Southeast Norway, Horten, 3184, Norway) , Du, Kang (Department of Micro and Nano Systems Technology, University College of Southeast Norway, Horten, 3184, Norway) , Haussener, Sophia (Institute of Mechanical Engineering, Ecole Polytechnique Federale de Lausanne, 1015, Lausanne, Switzerland) , Wang, Kaiying (Department of Micro and Nano Systems Technology, University College of Southeast Norway, Horten, 3184, Norway)
    ChemSusChem v.9 no.20 ,pp. 2878 - 2904 , 2016 , 1864-5631 ,

    초록

    Abstract Semiconducting heterostructures are emerging as promising light absorbers and offer effective electron–hole separation to drive solar chemistry. This technology relies on semiconductor composites or photoelectrodes that work in the presence of a redox mediator and that create cascade junctions to promote surface catalytic reactions. Rational tuning of their structures and compositions is crucial to fully exploit their functionality. In this review, we describe the possibilities of applying the two‐photon concept to the field of solar fuels. A wide range of strategies including the indirect combination of two semiconductors by a redox couple, direct coupling of two semiconductors, multicomponent structures with a conductive mediator, related photoelectrodes, as well as two‐photon cells are discussed for light energy harvesting and charge transport. Examples of charge extraction models from the literature are summarized to understand the mechanism of interfacial carrier dynamics and to rationalize experimental observations. We focus on a working principle of the constituent components and linking the photosynthetic activity with the proposed models. This work gives a new perspective on artificial photosynthesis by taking simultaneous advantages of photon absorption and charge transfer, outlining an encouraging roadmap towards solar fuels.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   The Prospecting Shortcut to an Old Molecule: Formaldehyde Synthesis at Low Temperature in Solution   SCI SCIE

    Heim, Leo E. (Department of Chemistry, Universität zu Köln, Greinstr. 6, 50939, Köln, Germany) , Konnerth, Hannelore (Department of Chemistry, Universität zu Köln, Greinstr. 6, 50939, Köln, Germany) , Prechtl, Martin H. G. (Department of Chemistry, Universität zu Köln, Greinstr. 6, 50939, Köln, Germany)
    ChemSusChem v.9 no.20 ,pp. 2905 - 2907 , 2016 , 1864-5631 ,

    초록

    Abstract Over 30 megatons of formaldehyde are required per year and industrially produced through three high‐temperature gas‐phase processes: i) natural gas reforming to syngas, ii) methanol synthesis, and iii) partial oxidation to formaldehyde with limited selectivity. In vast contrast to these energy‐intensive oxidative and dehydrogenative methods, a reductive “top‐down” methodology using CO 2 and CO as carbon source would be desirable and is not very well present in the literature for more than 100 years. The key to success is the reaction performance in liquid solution in water or methanol at low temperature.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   Charge‐ and Size‐Selective Molecular Separation using Ultrathin Cellulose Membranes   SCI SCIE

    Puspasari, Tiara (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Yu, Haizhou (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Peinemann, Klaus‐ (Advanced Membranes and Porous Materials Center, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia) , Viktor
    ChemSusChem v.9 no.20 ,pp. 2908 - 2911 , 2016 , 1864-5631 ,

    초록

    Abstract To date, it is still a challenge to prepare high‐flux and highselectivity microporous membranes thinner than 20 nm without introducing defects. In this work, we report for the first time the application of cellulose membranes for selective separation of small molecules. A freestanding cellulose membrane as thin as 10 nm has been prepared through regeneration of trimethylsilyl cellulose (TMSC). The freestanding membrane can be transferred to any desired substrate and shows a normalized flux as high as 700 L m −2 h −1 bar −1 when supported by a porous alumina disc. According to filtration experiments, the membrane exhibits precise size‐sieving performances with an estimated pore size between 1.5–3.5 nm depending on the regeneration period and initial TMSC concentration. A perfect discrimination of anionic molecules over neutral species is demonstrated. Moreover, the membrane demonstrates high reproducibility, high scale‐up potential, and excellent stability over two months.

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  8. [해외논문]   Surface‐Functionalized Electrospun Titania Nanofibers for the Scavenging and Recycling of Precious Metal Ions   SCI SCIE

    Dai, Yunqian (Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA) , Formo, Eric (Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA) , Li, Haoxuan (The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA) , Xue, Jiajia (The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA) , Xia, Younan (Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA)
    ChemSusChem v.9 no.20 ,pp. 2912 - 2916 , 2016 , 1864-5631 ,

    초록

    Abstract Precious metals are widely used as catalysts in industry. It is of critical importance to keep the precious metal ions leached from catalysts at a level below one part per million (ppm) in the final products and to recycle the expensive precious metals. Here we demonstrate a simple and effective method for scavenging precious metal ions from an aqueous solution and thereby reduce their concentrations down to the parts per billion (ppb) level. The key component is a filtration membrane comprised of titania (TiO 2 ) nanofibers whose surface has been functionalized with a silane bearing amino or thiol group. When operated under continuous flow at a rate of 1 mL min −1 and at room temperature, up to 99.95 % of the Pd 2+ ions could be removed from a stock solution with an initial concentration of 100 ppm. This work offers a viable strategy not only for the removal of precious metal ions but also for recovering and further recycling them for use as catalysts. For example, the captured Pd 2+ ions could be converted to nanoparticles and used as catalysts for organic reactions such as Suzuki coupling in a continuous flow reactor. This system can be potentially applied to pharmaceutical industry and waste stream treatment.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   Highly Productive and Enantioselective Enzyme Catalysis under Continuous Supported Liquid–Liquid Conditions Using a Hybrid Monolithic Bioreactor   SCI SCIE

    Sandig, Bernhard (Institut für Polymerchemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany) , Buchmeiser, Michael R. (Institut für Polymerchemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany)
    ChemSusChem v.9 no.20 ,pp. 2917 - 2921 , 2016 , 1864-5631 ,

    초록

    Abstract Enzyme‐containing ionic liquids (ILs) were immobilized in cellulose‐2.5‐acetate microbeads particles embedded in a porous monolithic polyurethane matrix. This bioreactor was used under continuous liquid‐liquid conditions by dissolving the substrates in a nonpolar organic phase immiscible with the ILs, thereby creating a biphasic system. Lipases ( candida antarctica lipase B, CALB, candida rugosa lipase, CRL) were used to catalyze the enantioselective transesterification of racemic ( R,S )‐1‐phenylethanol with vinyl butyrate and vinyl acetate, the esterification of ( +/ ‐ ) ‐2‐isopropyl‐5‐methylcyclohexanol with propionic anhydride and the amidation of ( R,S )‐1‐phenylethylamine with ethyl methoxyacetate. With this unique setup, very high productivities, that is, turnover numbers (TONs) up to 5.1×10 6 and space‐time yields (STYs) up to 28 g product L −1 h −1 , exceeding the corresponding values for batch‐type reactions by a factor of 3100 and 40, respectively, were achieved while maintaining or even enhancing enantioselectivity compared to batch reactions via kinetic resolution. To our best knowledge, this is the first continuously operated bioreactor using supported liquid‐liquid conditions that shows these features in the synthesis of chiral esters and amides.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  10. [해외논문]   Electrochemical Dealloying of PdCu3 Nanoparticles to Achieve Pt‐like Activity for the Hydrogen Evolution Reaction   SCI SCIE

    Jana, Rajkumar (New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, India) , Bhim, Anupam (New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, India) , Bothra, Pallavi (New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, India) , Pati, Swapan K. (New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, India) , Peter, Sebastian C. (New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, India)
    ChemSusChem v.9 no.20 ,pp. 2922 - 2927 , 2016 , 1864-5631 ,

    초록

    Abstract Manipulating the d‐band center of the metal surface and hence optimizing the free energy of hydrogen adsorption (Δ G H ) close to the optimal adsorption energy (Δ G H = 0) for hydrogen evolution reaction (HER), is an efficient strategy to enhance the activity for HER. Herein, we report a oleylamine‐mediated (acting as the solvent, stabilizer, and reducing agent) strategy to synthesize intermetallic PdCu 3 nanoparticles (NPs) without using any external reducing agent. Upon electrochemical cycling, PdCu 3 transforms into Pd‐rich PdCu (Δ G H = 0.05 eV), exhibiting remarkably enhanced activity (with a current density of 25 mA cm −2 at ∼69 mV overpotential) as an alternative to Pt for HER. The first‐principle calculation suggests that formation of low coordination number Pd active sites alters the d‐band center and hence optimal adsorption of hydrogen, leading to enhanced activity. This finding may provide guidelines towards the design and development of Pt‐free highly active and robust electrocatalysts.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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