Carbonaceous adsorbents with controllable surface area and the microporous volume ratio (Vmicro/Vpore) were activated from carbonized corncobs (i.e., char) with KOH etching plus CO2 gasification in this work. Activated carbons derived from KOH/char ratio equal to 1 and CO2 gasification time from 0 to 60 min exhibited BET surface area increasing from 1071 to 1991 m2 g−1 and the Vmicro/Vpore valu...

A series of highly branched trichain sulfosuccinate surfactants have been synthesized and studied in condensed CO2 and aqueous environments. Aqueous critical micelle concentrations (CMCs) showed a general trend of increasing CMC with decreasing chain length, whereas increased branching appeared to increase solubility in CO2 and aid the dispersion of water. Near infrared spectra confirmed observ...

We have previously investigated the formation of water-CO2 interface by means of a drop tensiometer [1]. In presence of CO2 , the interaction between the two adjacent phases leads to an organization of interfacial cluster network which controls the tension and the mechanical properties of the interface. The formation of those clusters at CO2 pressure lower than 80 bar inhibits the adsorption of...

Background and purpose: Elevated CO2 rate in a building affect the health of occupant. This document presents results of an experimental analysis conducted in 50 offices located in 12 buildings with different layer in Cameroon (Yaounde). This study took place in 2012, during the dry and the rainy seasons. The main goal is to show the influence of the building structure, the ventilation and the ...

The choice of stabilization target for CO2 concentration depends on the following: what is considered to be ‘dangerous anthropogenic interference with the climate system’; the forcings that might arise from non-CO2 gases; and the climate sensitivity. These three factors are specified here probabilistically, as probability density functions (pdfs), and combined to produce a pdf for the CO2 conce...

Excess carbohydrate calories in total parenteral nutrition (TPN) solutions can precipitate acute hypercapnic respiratory failure in patients with chronic lung disease secondary to increased carbon dioxide (CO2) production. Two young patients recovering from the adult respiratory distress syndrome experienced hypercapnia during weaning as a result of nutritionally related increased CO2 productio...

The microelectronics industry is focused on increasing chip complexity, improving the density of electron carriers, and decreasing the dimensions of the interconnects into the sub-0.25 mum regime while maintaining high aspect ratios. Water-based chemical mechanical planarization or polishing (CMP) faces several technical and environmental challenges. Condensed CO2 has significant potential for ...

When the earth was in its infancy, some four-and-a half billion years ago, it is believed that the atmosphere was predominantly composed of carbon dioxide, which would have put its CO2 concentration, in terms of the units most commonly used today, at something on the order of 1,000,000 ppm. Ever since, however, the CO2 content of the air in the mean has been dropping. By 500 million years ago, ...

In this paper, the mechanical properties (the flexural strength, compressive strength and drying shrinkage rate) of CO2-cured alkali-activated compound mineral admixtures (blast furnace slag powder (BFS) fly ash (FA)) are investigated. addition, corresponding chloride ion mobility coefficient is measured. Additionally, freeze–thaw cycles with an NaCl concentration 3% studied. Thermogravimetric ...