ADSORPTION OF ARGON ON GRAPHITIZED CARBON BLACK. SURFACE AREA AND HEATS AND ENTROPIES OF ADSORPTION1

The adsorption of water and other polar substances on to the surface of graphitized carbon black and macroporous silica modified by polymethylhydride silicone has been studied using gas chromatography. The adsorption heat values of the substances studied were determined and the concentration of surface hydrophilic centres estimated. Conclusions have been drawn concerning the number of water molecules adsorbed on to hydrophilic centres at low surface occupation values. In the case of water adsorption on the graphitized carbon black surface, the chromatographic data for the adsorption heat have been compared with the energy of water molecule interaction with the surface clusters modelling the micropores existing on the basal surface of carbon black particles as calculated using quantum chemical methods.

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Discussion of thermodynamic data obtained by adsorption gas chromatography of hydrocarbons on a new graphitized carbon black with a high specific surface area

Chromatographia ◽

10.1007/bf02490484 ◽

2000 ◽

Vol 51 (7-8) ◽

pp. 455-460 ◽

Cited By ~ 4

Author(s):

A. R. Mastrogiacomo ◽

E. Pierini

Keyword(s):

Gas Chromatography ◽

Carbon Black ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Thermodynamic Data ◽

High Specific Surface Area ◽

Graphitized Carbon Black ◽

Graphitized Carbon

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Effect of Heat Treatment on Reinforcing Properties of Carbon Black

Rubber Chemistry and Technology ◽

10.5254/1.3542518 ◽

1956 ◽

Vol 29 (1) ◽

pp. 286-295

Author(s):

W. D. Schaeffer ◽

W. R. Smith

Keyword(s):

Carbon Black ◽

Volatile Matter ◽

Graphitized Carbon Black ◽

Carbon Surface ◽

Minor Effect ◽

Carbon Blacks ◽

Carbon Black Surface ◽

Black Surface ◽

High Degree ◽

Degree Of Graphitization

Abstract The high degree of stiffness or modulus which reinforcing carbon blacks impart to rubber has often been associated with reinforcement. Modulus appears to be associated with the chemical nature of the carbon black surface ; when the carbon black surface is cleaned of combined oxygen and hydrogen, a drastic drop in modulus occurs, and this is not accompanied by an equally drastic decrease in tire road wear. Reinforcing and semireinforcing carbon blacks have been heat-treated at successive increments through a temperature range of 1000° to 2700° C. Treatment up to 1500° results in removal of all combined oxygen and hydrogen, followed by an increasing degree of graphitization at higher temperatures. These carbon blacks have been compounded in a standard natural-rubber compound and properties evaluated. Modulus is profoundly altered by the chemistry of the carbon surface. Electrical resistivity passes through a minimum at 1500° C. Scorchiness or premature vulcanization improves with removal of volatile matter. The degree of graphitization of the carbon has only a minor effect on rubber properties. A highly graphitized carbon black still imparts a high degree of resistance to abrasive wear to tire treads.

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