Hierarchically structured porous materials

The Sol-Gel Handbook Synthesis, Characterization, and Applications, First Edition. 

In this chapter, we present an overview of the synthesis strategies based on the sol-gel process for the preparation of multimodal porous networks of hierarchically structured functional materials and a brief introduction to their applications is given at the end of the chapter. 

Synthesis Strategies for Hierarchically Structured Porous Materials 

---

The presence of a significant external surface area, as e.g. present in hierarchically structured porous materials, can lead to an overestimation of the Dubinin-Radushkevich micropore volume as derived from CO2 physisorption. The method proposed here corrects for this apparent ultra-micropore contribution by subtraction of the proportional contribution from the DR-results. Advantages of this latter method are the ease of determining the correction factor and the simplicity of correction the obtained micropore volume under normal conditions using sub-atmospheric CO2 and N2 adsorption measurements. 

Su, B.L., Sanchez, C., and Yang, X.Y. (eds) (2011) Hierarchically Structured Porous Materials From Nanoscience to Catalysis, Separation, Optics, Energy, and Life Science, Wiley-VCH Verlag GmbH, Weinheim. 

Synthesis Strategies for Hierarchically Structured Porous Materials 991... 

Therefore, hierarchically structured porous materials with novel structure have significantly stimulated the researchers to develop innovative synthesis strategies and therefore deserve more detailed studies, mainly devoted to the optimization, such as further modification of individual porosities and intricate morphologies with special functionalities, as well as surface functionalization, and scale-up of the synthesis methods. 

---