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

Purpose The purpose of this study was to improve the biomechanical properties of the cornea through the incorporation of carbon nanostructures. Methods Healthy Japanese rabbits were used to evaluate the effect of carbon nanostructures’ incorporation in the cornea. Rabbits were divided in two groups A and B. In each of these groups, the corneas were divided in (i) corneas not submitted to any treatment (the control group), (ii) corneas modified either with carbon nanostructures (group A), or with the traditional cross-linking technology (group B). After modification, rabbits were euthanized at different time intervals. The biomechanical properties of the treated corneas were evaluated using the inflation method. Results Biomechanical tests based on the inflation method show that the incorporation of carbon nanostructures to the cornea and their proper distribution within it gives rise to a large improvement in the mechanical properties and tangential elastic modulus (up to 155%). These results anticipate that this novel and easy approach based on nanotechnology is able to compete with the actual cross-linking technology applied in clinical ophthalmology using a photosensitive molecule, such as riboflavin and unpleasant UV-A radiation. Conclusions The incorporation of carbon nanostructures (single-walled carbon nanotubes and graphene) in corneal stroma is proposed as a promising alternative to improve the mechanical properties in the treated eyes. The proper dispersion of the carbon nanostructures a few days after implementation (down to 60 micrometers depth) explains the successful results achieved. Translational Relevance Nanotechnology applied to the eye constitutes a promising approach for ocular tissue reinforcement.

Carbon Nanostructures for Ocular Tissue Reinforcement

Pt/activated carbon catalysts were prepared by using [Pt(NH3)4]Cl2 as the metal precursor, and characterized by a number of techniques. The selectivity of these catalysts towards crotyl alcohol in the gas-phase hydrogenation of crotonaldehyde was considerably increased when the activated carbon support was slightly oxidized before the metal incorporation.

Improvement of the Selectivity to Crotyl Alcohol in the Gas‐Phase Hydrogenation of Crotonaldehyde Over Platinum/Activated Carbon Catalysts.

Supercritical Methane Adsorption – A Tool for Characterization of Carbonaceous Adsorbents

The adsorption of argon at 77 and 90K on graphite (Sterling) and boron nitride has been studied by both conventional volumetry and adsorption microcalorimetry. The pairs of adsorption isotherms for both adsorbents cross at a point very coincident with the Vm value given by the BET equation. At the same time, the crossing of adsorption isotherms coexists with a phase change of the adsorbed layer as detected by adsorption microcalorimetry. Although these results are very satisfactory, prior to stablish a firm correlation between the two phenomena a larger number of systematic experiments is of course needed.

Seeking for a possible correlation between the existence of a “crossing point” of the adsorption isotherms and the state of the adsorbed phase for the Ar/graphite and Ar/boron nitride systems

Large CO2 emissions coming from the combustion of fossil fuels are responsible for the global warming in the Earth . These envi - ronmental concerns are forcing the different governments to find solutions to reduce CO2 emissions and mitigate these adverse effects . One of the most promising solutions consists in the selective CO2 capture on industrial streams using porous adsorbents (zeolites, activated carbons and MOFs) combining a high adsorption capacity and a proper selectivity to CO2 versus other molecules from flue gas, together with a proper regeneration .

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Francisco Rodríguez-Reinoso

Papers

Carbon Nanostructures for Ocular Tissue Reinforcement

Improvement of the Selectivity to Crotyl Alcohol in the Gas‐Phase Hydrogenation of Crotonaldehyde Over Platinum/Activated Carbon Catalysts.

Supercritical Methane Adsorption – A Tool for Characterization of Carbonaceous Adsorbents

Seeking for a possible correlation between the existence of a “crossing point” of the adsorption isotherms and the state of the adsorbed phase for the Ar/graphite and Ar/boron nitride systems

Retos actuales para la captura y almacenamiento de CO2