111. Porosity and surface area of carbon black

✍ Scribed by Jaspard H. Atkins

• Publisher: Elsevier Science
• Year: 1965
• Tongue: English
• Weight: 130 KB
• Volume: 3
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(65)90177-6

✦ Synopsis

CARBON

methods. Gas adsorption methods almost all involve measuring the amount of gas adsorbed at that point where adsorption predominantly into the first adsorbed layer gives way to adsorption predominantly into the second layer. The precision of the method depends on the sharpness of this transition; nitrogen at -195" is preferred because it invariably affords a sharp transition. The validity of the determination is affected more by the proper choice of adsorbate and temperature than by the actual method used to analyze the data. The BET and most other equations may be regarded merely as convenient analytical tools for locating the transition or "Knee-bend".

Their utility for this purpose bears little or no relation to the reality of the physical models from which they were derived.

109. The helium densities of polymer carbons J. J. Kipling, J.