다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Supercapacitors, also called ultracapacitors or electrochemical capacitors, store electrical charge on high-surface-area conducting materials. Their widespread use is limited by their low energy storage density and relatively high effective series resistance. Using chemical activation of exfoliated graphite oxide, we synthesized a porous carbon with a Brunauer-Emmett-Teller surface area of up to 3100 square meters per gram, a high electrical conductivity, and a low oxygen and hydrogen content. This sp 2 -bonded carbon has a continuous three-dimensional network of highly curved, atom-thick walls that form primarily 0.6- to 5-nanometer-width pores. Two-electrode supercapacitor cells constructed with this carbon yielded high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes. The processes used to make this carbon are readily scalable to industrial levels.

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Carbon-based Supercapacitors Produced by Activation of Graphene

Kenji Sumida, David L. Rogow, Jarad A. Mason, Thomas M. McDonald, Eric D. Bloch, Zoey R. Herm, Tae-Hyun Bae, Jeffrey R. Long

Carbon Dioxide Capture in Metal–Organic Frameworks

Carbon properties and their role in supercapacitors

A Comparative Study of Sulfated and Phosphated Titanium Oxides Prepared by Hydrolysis from Titanium Ethoxide

Two types of titania matrix were investigated as a support for the prolonged drug delivery of the antidepressant fluoxetine. Sample MT was synthesized using carbon template and consisted of titania microtubes on which then fluoxetine was adsorbed. Sample SG was synthesized by the sol-gel method when the drug was added during the reaction. The morphology of the powder surfaces was found to be different: nanotubes versus almost spherical particles with much larger surface area of SG and smaller pores. The relative degrees of hydroxyl coverage of the surface were studied by FTIR-spectroscopy and were found to be much larger for the sol-gel complex. Theoretical modeling was applied to consider possible interactions between the drug and the matrices. The liberation of the drug was proved to be faster from complex MT and was attributed to weaker drug-matrix interactions in combination with larger pore size.

Comparison of nanostructured titania matrices obtained by carbon template and sol-gel methods for controlled release of fluoxetine.

The authors are indebted to the Spanish Government for financial support (Project CTQ2008-02491, partially funded by the FEDER program of the European Union) and to the commission of European Communities Specific OpenTok Project MTKD-LT-2005-030040.

/pdf/characterization-of-carbon-molecular-sieve-membranes-dcgg6ys7ys.pdf

Characterization of carbon molecular sieve membranes supported on ceramic tubes

A Highly Reusable Carbon-Supported Platinum Catalyst for the Hydrogen-Transfer Reduction of Ketones.

Selective CO2 capture in industrial streams is of paramount importance to decrease actual emissions to the atmosphere, and to minimize the associated environmental concerns. Among the different possibilities to capture CO2, adsorption using nanoporous networks is one of the most promising approaches, provided that the adsorbent can be properly designed in terms of porous structure and surface chemistry. The material has to be designed to achieve a preferential interaction with CO2 versus other competing molecules (e.g., CH4, N2, O2, etc.) also present in the industrial effluents. Promising adsorbents for CO2 capture include activated carbons, zeolites, and metal–organic frameworks (MOFs), among others. This chapter will focus on activated carbon materials and the effect of the porous structure and surface chemistry in the selective adsorption of CO2. Although the chapter will concentrate mainly in physisorption processes, a final section will be introduced devoted to a novel approach for CO2 capture based on natural processes, the so-called solid state storage.

Francisco Rodríguez-Reinoso

Papers

A Comparative Study of Sulfated and Phosphated Titanium Oxides Prepared by Hydrolysis from Titanium Ethoxide

Comparison of nanostructured titania matrices obtained by carbon template and sol-gel methods for controlled release of fluoxetine.

Characterization of carbon molecular sieve membranes supported on ceramic tubes

A Highly Reusable Carbon-Supported Platinum Catalyst for the Hydrogen-Transfer Reduction of Ketones.

CO 2 Adsorption in Activated Carbon Materials