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Bottleneck tubule

FIG. 15. Schematic illustrations of shapes of the Au nanotubule obtained by doing the electroless Au plating at (A) pH = 10 and (B) pH = 12. The higher pH causes bottleneck tubules. The tubules plated at the lower pH also have some of this bottleneck character. Hence, the depictions in both (A) and (B) are approximate and serve to illustrate the conceptual differences between the two types of nanotubules investigated here. [Pg.33]

Because of the nonuniform shape of the bottleneck tubules (Fig. 15B), it is difficult to extract an i.d. using the gas-flux method [71]. All bottleneck membranes were plated a pH 12 bath for a duration of 8 hours, t Quinine was excited at = 308 nm and detected at X = 403 nm. [Pg.39]

The size-based selective separation has been in use in the form of dialysis for a long time. The nanofiltration membranes demonstrated here combine both size and chemical transport selectivity and are selective for the particular separation involved. The tubules are prepared as bottleneck tubules as shown in Figure 20.5. The diameter of the tubule may be manipulated, depending on the preparation conditions, resulting in applications based on size-based separations, pH switch-able ion-transport selectivity, manipulation of potential dependent fluxes etc. [75, 95, 96]. [Pg.657]


See other pages where Bottleneck tubule is mentioned: [Pg.31]    [Pg.657]    [Pg.43]    [Pg.51]    [Pg.31]    [Pg.657]    [Pg.43]    [Pg.51]    [Pg.32]    [Pg.38]    [Pg.50]   
See also in sourсe #XX -- [ Pg.657 ]




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