Perpendicular transport

M 16] [P 16] Droplet transport could be achieved for frequencies of the sequential voltages in the range 0.5-3.0 Hz [100, 101]. An increase in the ratio of electrode width to pitch facilitated the droplet transport. Since only perpendicular transport can also be achieved, fluid guiding is necessary. This can be accomplished, e.g., by use of thin polymer films. 

FIGURE 6.6. Three types of membrane transport (a) perpendicular transport, (b) parallel transport of type I and (c) parallel transport of type n. 

The Cell Used to Observe Perpendicular Transport and Parallel Transports of Types I and U ... 

FIGURE 6,7. Electrolytic cells for (a) perpendicular transport, (b) parallel transport of type I and (c) parallel transport of type n. REwi, REw2. REa.wi, REb.wi. REa,w2 and REb,w2 are silver/silver chloride reference electrodes. REm.i, REm,2. REa.m and REb.m are TPhB" ion-selective reference electrodes. CEwi, CEw2, CEa.wi. CEb.wi. CEa.m and CEb.m are platinum wire counter electrodes. 

The voltammogram for perpendicular transport was recorded by scanning the potential difference Ewi-wi between W1 and W2 and measuring the current /wi-w2 between W1 and W2 [see Figure 6.7a]. During the recording of the voltammogram, variations of... 

The voltammograms recorded for parallel transports of types I and II were very similar to those for perpendicular transport, and had characteristics which were described as (a), (b) and (c) in the previous section and expressed by Equations (35) and (36). The results indicate that the voltammograms were realized mainly by the composite of two interfacial ion transfer reactions, i.e., reactions at the Wl/M interface of sites A and B for parallel transport of type I and reactions at the W1/M and W2/M interfaces of sites A and B for parallel transport of type II. In other words, parallel transport of type I(W1->M->W1 transport) and parallel transport of type II (M->- W1 ->M or M-> W2-> M transport) could be realized when potential differences were applied between two sites in one aqueous phase of the system of Figure 6.7b and between two sites in the membrane of the system of Figure 6.7c, respectively. 

Wu, S. H. W. and McConell, H. M. Lateral phase separations and perpendicular transport in membranes. Biochemical and Biophysical Research Communications 55 4S4, 1973. 

In this chapter, the fundamental feature of parallel transports of types I and II elucidated with the aid of voltammetry for ion transfer at the interface of two immiscible electrolyte solutions is introduced, and compared with that of perpendicular transport [6-9]. 

III. CHARACTERISTICS OF VOLTAMMOGRAMS FOR PERPENDICULAR TRANSPORT AND PARALLEL TRANSPORTS OF TYPES I AND II ... 

In order to elucidate the features of parallel transports of types I and II, based on the voltammetric method and concept, voltammograms for parallel transports of types I and 11 were measured and compared with that for Perpendicular transport. ... 

B. Comparison of Voltammogram for Parallel Transport of Type I with That for Perpendicular Transport ... 

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