ASU Electronic Theses and Dissertations
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We studied the relationship between the polarizability and the molecular conductance that arises in the response of a molecule to an external electric field. To illustrate the plausibility of the idea, we used Simmons' tunneling model, which describes image charge and dielectric effects on electron transport through a barrier. In such a model, the barrier height depends on the dielectric constant of the electrode-molecule-electrode junction, which in turn can be approximately expressed in terms of the molecular polarizability via the classical Clausius-Mossotti relation. In addition to using the tunneling model, the validity of the relationships between the molecular polarizability and …
- Vatan Meidanshahi, Reza, Mujica, Vladimiro, Chizmeshya, Andrew, et al.
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This thesis studies three different types of anhydrous proton conducting electrolytes for use in fuel cells. The proton energy level scheme is used to make the first electrolyte which is a rubbery polymer in which the conductivity reaches values typical of activated Nafion, even though it is completely anhydrous. The protons are introduced into a cross-linked polyphospazene rubber by the superacid HOTf, which is absorbed by partial protonation of the backbone nitrogens. The decoupling of conductivity from segmental relaxation times assessed by comparison with conductivity relaxation times amounts to some 10 orders of magnitude, but it cannot be concluded whether …
- Ansari, Younes, Angell, Charles A, Richert, Ranko, et al.
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