Triad unidirectionally oriented

Figure 3. Unidirectionally oriented A-S-D triads in LB films containing 15 alternate bilayers consisting of a triad-CaT (1 5) and a pure CaT monolayer. In type a (a), the D tails of A-S-D triads orient towards the air, while in type b (b) the tails orient towards the substrate plate.

SSPM of unidirectionally oriented A-S-D triads in alternate mono-layers for detection of photo-induced charge separation... 

Figure 17. The change in the surface potential by step illumination for ca. 2-3 s with a He-Cd laser of 441.6 nm in a total reflection mode on (a) a type a alternate and (b) a type b alternate LB film containing 15 unidirectionally oriented A-S-D triad monolayers, and (c) a black LB film.

M. Fujihira, H. Yamada, Molecular Photodiodes Consisting of Unidirectionally Oriented Amphipathic Acceptor Sensitized Donor Triads , Thin Solid Films, 160, 125 (1988)... 

For the studies of LB monolayer assemblies, information about the orientation of amphiphilic molecules in the monolayers is important, as well as determination of the chemical functionalities. The Kelvin method [104] is a well-established technique for determining the contact potential differences (CPDs) between reference electrode and a metal sample. The CPD for clean metal surfaces is given by the difference in the work functions of the two materials. The work functions can be changed by adsorption of molecules with different dipole moments. Therefore, the photoin-duced dipole change of the triad molecules unidirectionally oriented in LB monolayers on electrode surface can be easily detected as a change of CPD by Kelvin method. The Kelvin method of measuring the CPD makes use of the vibrating capacitor. 

For the SMM studies of LB films containing unidirectionally oriented A-S-D triads, the alternate LB multilayer systems shown in Fig. 26 are constructed [95]. In the LB assemblies, linear-type A-S-D triads are arranged unidirectionally in two ways with the D tail of the triad toward the air (a) or toward the substrate plate (b), respectively. For the fabrication of these LB assemblies, a fatty acid is used as a... 

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