Oxide Aerogels

Keywords nanocrystalline oxides aerogels destructive sorbents halocarbons MgO TiCh titanium oxydifluoride carbon coating... 

Ahmed, M.S. Attia, Y.A. Multi-metal oxide aerogel for capture of pollution gases from air. Appl. Therm. Eng. 1998, 18 (9/10), 787-797. 

A somewhat more complicated way to do this reaction is to use what is called a thorium oxide "aerogel" catalyst. A lower temperature and a higher... 

Figure 6.5. Williamson-Hall plot obtainedfrom the diffraction pattern of a non-annealed titanium oxide aerogel...

Gas production resulting from the oxidation reaction is not the only reason for the observed phenomenon. Often a small amount of liquid remains condensed inside the smallest pores as a result of capillary condensation. Above a temperature of about 120-150°C, the liquid, for instance water, evaporates and creates a similar effect. Previously oxidized aerogel samples expand when they are heat treated as a consequence of adsorbed water evaporation. They shrink again in a small temperature range because of the adsorption of air moisture when cooled in air. No shrinkage is recorded if cooling is performed under vacuum. Obviously, the expansion is heating rate dependent [11]. 

Vanadium Oxide Aerogels Enhanced Energy Storage in Nanostructured Materials... 

In this chapter, we focus on the importance of nanoarchitecture in determining the electrochemical properties of transition metal oxide aerogels. After a brief introduction to aerogels and their synthesis methods we give an overview of the electrochemical characterization techniques employed when dealing with nanostructures. This chapter concludes with a case study on how aerogel nanostructures have improved the electrochemical properties of vanadium pentoxide. 

Transition Metal Oxide Aerogels Through Sol-Gel Synthesis... 

Efforts to enhance the conductivity of transition metal oxide electrodes have included the preparation of composites of the oxide with a conductive material, such as carbon black. Traditional composite electrodes, however, are characterized by aggregation of the carbon black particles [23]. These aggregates are typically on the order of hundreds of nanometers in diameter and may occlude the oxide aerogel surface. Work to enhance the conductivity of the transition metal oxide... 

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