Aligned porous sugar acetate

Recently, an entirely new approach to prepare porous materials was developed by templating the structure of solid CO2 by directional freezing [36]. In this process, a liquid CO2 solution was frozen in liquid nitrogen uni-directionaUy. The solid CO2 was subsequently removed by direct sublimation to yield a porous, solvent-free structure with no additional purification steps (Fig. 1). Other C02-soluble actives could be incorporated into the porous structure uniformly. This was demonstrated by dispersing oil red uniformly in the aligned porous sugar acetates [36]. This method differs fundamentally from the other C02-based techniques [ 14-29], and offers the unique advantage... 

Fig. 1. Aligned porous sugar acetate produced by directional freezing of liquid CO2 solution. The red arrow represents the approximate direction of freezing. Reproduced with permission copyright 2005 American Chemical Society [36],...

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See also in sourсe #XX -- [ ]

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