Monolithic columns scanning electron micrographs

FIGURE 7.1 Scanning electron micrographs of a polystyrene-divinylbenzene monolithic column prepared in a 20-pm fused silica capillary tube (reproduced from the reference, Ivanov et al. (2003), with permission from American Chemical Society). 

FIGURE 7.3 Scanning electron micrographs of monolithic silica prepared from sol-gel methods, (a) monolithic silica prepared from TMOS in a test tube, and monolithic silica columns prepared from a mixture of TMOS and MTMS, (b) in a 50-pm fused silica capillary, (c) in a lOO-pm fused silica capillary, and (d) in a 200-pm fused silica capillary tube (reproduced from the reference, Motokawa et al. (2002), with permission from Elsevier). 

Fig. 18. Scanning electron micrograph of monolithic silica-based capillary column. (Reprinted with permission from [205]. Copyright 2000 American Chemical Society)... 

Fig. 10. Scanning electron micrographs of monolithic poly(divinylbenzene) capillary column. Note that the porous monolith is surrounded by an impervious tubular outer polymer layer resulting from copolymerization of the monomer with the acryloyl moieties bound to the capillary wall. This layer minimizes any direct contact of the analytes with the surface of the fused-silica capillary...

Fig. 16.3. Scanning electron micrographs of cross-sections of a MIP-filled capillary column. The super-porous morphology of the polymer monolith can be seen. Micrometre-sized globular units of macroporous MIP surrounded by interconnecting super-pores (left). A superpore of about 7 pm in width (above, right). Covalent attachments of the MIP to the capillary wall (below, right). Reprinted from [39] Copyright (1997), with permission from American Chemical Society.

Figure 7.5 Monolithic stationary phase (reproduced by permission of Merck). Top Separation of Gamonil and byproducts. Conditions column, 8.3cm x 7.2 mm i.d. stationary phase, SilicaROD RP 18 e mobile phase, water with 20 mM phosphoric acid-acetonitrile, combined solvent and flow gradient, 10-50% acetonitrile and 3-9 ml min UV detector, 256 nm. Bottom Scanning electron micrograph ofthe stationary phase.

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