Graphite worm

Fig. 34a,b. SFM-micrographs of the monolayers on a HOPG b mica prepared by spincasting of 14-ABG-PS solutions in cyclopentane (c = 0.1 mg/ml). Individual molecules in (a) aligned parallel to the substrate and bent at characteristic angles of 60° and 120° to foUow the threefold symmetry of graphite. The worm-like molecules In (b) woimd aroimd each other and resulted in a felt-like structure [86]... 

Macropores in exfoliated graphite, which can sorb up to 80 g of heavy oil per 1 g of exfoliated graphite [86], were analyzed with the aid of image analysis [150], An example of a histogram for the cross-sectional area of macropores formed in worm-like particles is shown in Figure 2.20d. 

Figure 4. Single worm-like polymer chains of den-dronized polystyrene deposited on pyrolytic graphite, imaged by topographic scanning force microscopy (SFM) [24 the inset illustrates the structure of the den-dron-substituted chains...

The exfoliated graphite that is commercially available and used for the sorption ofviscous organics is discussed in the following sections and the averaged parameters of pores among and inside the worm-like particles are summarized in Table 27.1. Histograms of cross-sectional area of these pores are shown in Fig. 27.2. 

Table 27.1 Parameters for pores among and inside the worm-like particles in a commercially available exfoliated graphite...

Zheng, Y.P., Wang, H.N., Kang, F.Y., et al. (2004). Sorption capacity of exfoliated graphite for oils - sorption in and among worm-like particles. Carbon, 42, 2603-7. 

Fig. 14. Procedure to prepare a fiactured surface of a worm-like particle of exfoliated graphite. Reprinted from Ref. [8] with permission from Elsevier.

Parameters for spaces among the worm-like pailicles in commercial exfoliated graphite... 

Exfoliation volume is a parameter for a lump of exfoliated graphite, including all kinds of pores (large open pores among the worm-like particles, crevice-like pores on the surface of particles, and pores inside the particles) (see Section 5.3). In most exfoliated graphites, pores detected by gas adsorption techniques usually are in a negligibly small amount... 

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