Ascorbic Acid Chemistry, Metabolism, and Uses by Seib P.A., Tolbert B.M. (eds.)

By Seib P.A., Tolbert B.M. (eds.)

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Figure 16A shows an electron micrograph of a hexagonal HI-phase of PB-PEO in water. The morphology has been stabilized by g-irradiation. The diameter of the hydrophobic, hexagonally packed PB-cylinders is 28 nm. The sol-gel process carried out in the aqueous phase followed by calcination leads to the mesoporous silica structure shown in Fig. 16B [60]. The cylindrical, hexagonally arranged pores have diameters of 29 nm which demonstrates the good control of the templating procedure. 21 Amphiphilic Block Copolymers for Templating Applications A B Fig.

38. 39. 40. 41. 42. 43. Antonietti M, Göltner C (1997) Angew Chem 109:944 Göltner C, Cölfen H, Antonietti M (1999) Chem Unserer Zeit 33:200 Cohen RE (1999) Curr Opin Solid State Mater Sci 4:587 Förster S, Antonietti M (1998) Adv Mater 10:195 Förster S, Plantenberg T (2002) Angew Chem Int Ed 41:688 Jerome R, Tong JD (1998) Curr Opin Solid State Mater Sci 3:573 Yagci Y, Mishra MK (1996) In: The polymeric materials encyclopedia. CRC Press, Boca Raton Riess G, Hurtrez G, Bahadur P (1985) In: Mark HF, Bikales NM, Overberger CG, Menges G (eds) Encyclopedia of polymer science and engineering.

These are expected to be a welcome complement to classical microporous zeolites, the pore diameter of which is limited due to the crystalline structure of these materials. Mesoporous materials possess large specific surface areas that can be functionalized chemically with respect to acidity, catalytic activity or specific affinity. Their relatively narrow pore-size distribution makes them promising for size-exclusion processes. Excellent reviews have been published since on the synthesis of different pore geometries and sizes, functionalities and possible applications [10–12].

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