Characterization of non-graphitized carbon blacks: a model with surface crevices.

摘要: Experimental isotherms for argon and nitrogen adsorption on two non-graphitized carbon substrates, Carbopack B Cabot BP280, do not obey Henry's Law in the range of pressures accessible to most sensitive MKS pressure transducers. At high pressures, close bulk coexistence (P0), at temperatures below triple point temperature cross P0 axis a finite loading, behaviour which is interpreted as incomplete wetting. It was found that adsorbed density BP280 lower than is, turn, only slightly highly graphitized F, suggesting there long-range effect surface structure blacks, accumulation higher layers, especially BP280. We have carried out extensive Monte Carlo simulations compare experimental observations with molecular model substrate surfaces decorated crevices dimensions. From analysis data, it typical width order 0.65-0.9 nm. In region, crossing by can be explained an adsorbate less dense more disordered fcc crystal, consequent raising between gas phase above P0. Adsorbate loading where isotherm crosses attributed concentration leading irregular arrangement atoms interface separating phase. This results weaker gas-adsorbate interactions supresses build-up layers. suggest use pressure, temperature, useful tool assessing presence black.