An experimental approach to test sorption mechanisms in MCM-41

Rapid adsorption and entrapment of benzoic acid molecules onto mesoporous silica (FSM-16)

“…It is known that hysteresis is observed in adsorption and desorption isotherms of organic gases on mesoporous material. This is based on the affinity of the adsorbate to the surface of the mesoporous material and its surface geometry [19,20]. Thermogravimetry indicates a weight loss of BA from FSM-16 during desorption.…”

Domain theory for capillary condensation hysteresis

“…62 On the one hand, scanning curves for large pore diameters ͑D ജ 3.6 nm for N 2 or Ar͒ are converging, i.e., meet the hysteresis loop at its closure point. On the other hand, scanning curves for smaller pores are crossing, i.e., meet the hysteresis loop before its closure point.…”

“…62 This type of behavior, referred to as "returning" in Ref. 62, cannot be explained in the framework of model A or B or any existing theory ͑Mason's model 23 or Cordero's model 59 ͒. This result suggests that synthesis conditions may not have led to MCM-41 samples having the usual pore features, i.e., a regular cylindrical section having a constant radius.…”

“…62 This type of behavior, referred to as "returning" in Ref. 62, cannot be explained in the framework of model A or B or any existing theory ͑Mason's model 23 or Cordero's model 59 ͒.…”

Estudio de la adsorción de materiales mesoporosos simples y complejos mediante simulación molecular

“…Con respecto a los estudios de barrido en MCM- 41, McNall et al (2001) [31] concluyen que ningún modelo simple puede tener en cuenta todos los detalles de la medición del ciclo de histéresis [32]. Aún en el caso de los canales ideales de MCM-41, hay impurezas, rugosidades y defectos los cuales pueden tener efecto en el comportamiento de adsorción del ciclo de histéresis [33].…”