(Color online) Zig-zag geometry of microfabricated TLC plates. Plates differed in their channel and hedge widths. Dimensions of (a) and (c) are given in Table I . The hedge length (b) is 50 μm.
(Color online) Atomic percent oxygen as a function of CNT exposure time to ozone, as measured by XPS. The two different experiments are represented as squares and stars, where each data point in the figure represents a different sample. For the squares, the fitting parameters a and b are 1.26 and 1.60, respectively (R2 = 0.977). For the stars, the fitting parameters a and b are 2.31 and 2.43, respectively (R2 = 0.9646). (See fitting equation in text.)
(Color online) SEM micrograph (top view) of an ozone-primed CNT forest coated with SiO2 deposited by ψ-ALD.
(Color online) (a) Representative fit of the C 1s envelope from an oxidized CNT to signals attributable to C-C, C-O, C=O, O-C=O, and π → π* moieties, and (b) a plot of the C-O, π → π*, C=O, and O-C=O peak areas from peak fitting of C 1s envelopes from CNTs with different at. % oxygen values.
(Color online) Separation of two fluorescent dyes (sulforhodamine B and rhodamine 6 G) on (a) a type II plate, and (b) a type IV plate (see Table I for details of plate geometries). The developing solvent for these separations was 70:30:1 IPA:MeOH:LiCl. Separation distances were 30 mm. Development times, R F values, and efficiencies are in the text. In (a), a β-front is observed above the two fluorescent dyes, which originates from the mobile phase itself being separated (or demixed) on the TLC plate (Ref. 55 ).
(Color online) Development time vs. channel width for microfabricated TLC plates.
Feature dimensions, as entered into a computer-aided design (CAD) drawing program, of TLC plates microfabricated for this study. (c) and (a) are indicated in Fig. 1 .
R F values, chromatographic efficiencies (Hobs values in μm), and development times for TLC plates microfabricated with different geometries (type I–IV plates, see Table I ). All development distances were 30 mm. Two of the images corresponding to these separations are shown in the text and the remainder in the supporting information (Ref. 56 ).
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