Abstract
Single crystals of polyoxymethylene are flat, homogeneous, and essentially uncharged and offer a large specific surface area. Since they can be prepared reproducibly and in large amounts, they constitute a suitable model substrate in systematic adsorption studies. The crystallization procedure is discussed in some detail. The thickness of the crystals is obtained from EM and SAXS measurements, the results being in excellent mutual agreement. Combining this thickness with the crystal density the geometrical surface area is found to be 150 m 2/g. This is compared with the surface area obtained by BET analysis of nitrogen adsorption (30 m 2/g) and with the surface area that follows from adsorption of polyoxyethylated nonyl phenols from aqueous solution (60 m 2/g). The discrepancy in the results is explained in terms of different degrees of aggregation of POM crystals in the dry state and in suspension. Finally, some preliminary results of albumin and sodium polystyrene sulfonate adsorption are discussed.
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