Angular Scattering of Electrons in Hydrogen and Helium by Harnwell G. P.

By Harnwell G. P.

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30 nm) were used as the templates. ) of the nanotubules can be varied by varying the plating time (Fig. 14). s of molecular dimensions (Ͻ1 nm) are obtained* [106]. We have discovered that the shape of the Au nanotubule can be changed by varying the rate of the plating reaction. d. in the middle (Fig. 15), are obtained. Such bottleneck tubules are a form of ultrathin film composite membrane [102,107] and should provide high permeate flux without sacrificing transport selectivity. s of tubules using a gas permeation method (see Ref.

This is undoubtedly because prior studies have shown that, because of its short alkyl chain, PT monolayers are disordered. ‡ Although polymeric membranes that show switchable transport properties have been described, the switchability was based on Faradaic electrolysis of the polymer. © 1999 by Marcel Dekker, Inc. FIG. 13. Variation of E m with potential applied to the membrane (1 mM KBr on l side and 10 mM KBr on h side; membrane as per Fig. 12) for an untreated Au nanotubule membrane (upper curve) and a PT-coated membrane (lower curve).

Chemical Transport Selectivity In addition to the transport selectivities based on molecular charge or size described above, chemical interactions between the membrane material and the molecule to be transported can also strongly influence the rate and selectivity of transport. The introduction of chemically based transport selectivity was accomplished by chemisorbing thiols (RSH) to the Au tubule surfaces* [113]. Membranes derivatized with two different R groups—the hydrophobic R ϭ -C 16H 33 and the more hydrophilic (2)R ϭ -C 2H 4-OH— were prepared.

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