1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

Characterization of microporous solids by immersion calorimetry

Publisher Summary
Activated carbons are uniquely complex in terms of the size, shape and variability of their porosity. This chapter focuses on the characterization of an activated carbon. The techniques of adsorption from gaseous and liquid phases, kinetics and energetics, of assessments of surface polarities and X-ray and neutron scattering are discussed to provide a complete characterization. The adsorption of gases and vapors is a physical process, not involving formation of chemical bonds. Adsorbates differ in terms of their molecular size and polarity with the surfaces of adsorbents being energetically heterogeneous. Modern procedures measure extents of adsorption of gases using automatic volumetric methods which are suitable for most solids with surface areas >1.0m2g−1. The chapter concludes that a pragmatic characterization of an activated carbon can made from three isotherms of N2 at 77 K, CO2 at 273 K and H2O at 298 K or enthalpy of immersion in water. Additionally, industrial performance is indicated using breakthrough behavior.

D. Atkinson

Papers

Physical adsorption and heat of immersion studies of microporous carbons