Stabilization of monolayers and Langmuir-Blodgett films of mesogenic components by mixing

Öhlmann, André; Rettig, W.; Diele, Siegmar; Kuschel, Frank; Weißflog, W.

doi:10.1016/0040-6090(91)90064-5

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…On the basis of the surface manometry and BAM studies, we suggest that there may be a weak charge-transfer interaction between the donor EPPH and acceptor 8CB molecules in the formation of the condensed complex at the A−W interface. In this context, it should be mentioned that there has been a report on the mixed Langmuir monolayer of mesogenic molecules in which one component was the electron acceptor and the other component was the electron donor . In these studies, the individual monolayers which were unstable formed a stable mixed monolayer exhibiting a large reduction in the A/M.…”

Section: Resultsmentioning

confidence: 99%

“…Studies on nonamphiphilic dichroic azo dye mixed with mesogenic amphiphilic molecules have been reported to form stable monolayers . Mixed monolayer studies on mesogenic molecules with donor−acceptor character leading to charge-transfer interactions have been reported to stabilize the system . These studies indicate that the shape of the molecules and their interactions play an important role in the stabilization of the mixed monolayer.…”

Section: Introductionmentioning

confidence: 99%

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Photoinduced Phase Separation and Miscibility in the Condensed Phase of a Mixed Langmuir Monolayer

Viswanath¹,

Ka²

2004

Langmuir

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We report our studies on the mixed Langmuir monolayer of mesogenic molecules, p-(ethoxy)-p-phenylazo phenyl hexanoate (EPPH) and octyl cyano biphenyl (8CB), employing the techniques of surface manometry and Brewster angle microscopy. Our studies show that the mixed monolayer exhibits higher collapse pressures for certain mole fractions of EPPH in 8CB as compared to individual monolayers. Also, a considerable reduction in the area per molecule is seen in the mixed monolayer, indicating a condensed phase. We have also studied the photostability of the mixed monolayer at different initial surface pressures. The mixed monolayer, under alternate cycles of UV and visible illumination, exhibits changes in surface pressures. This is due to the photoinduced transformation of EPPH isomers in the mixed monolayer. Our in-situ Brewster angle microscope studies for 0.5 mole fraction of EPPH in 8CB show a phase separation in the UV and a miscible phase in the visible, at low surface pressures ( approximately 5 mN/m). At higher surface pressures ( approximately 10 mN/m), under UV illumination, we find a phase separation which does not revert to a miscible phase under visible illumination.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoinduced Phase Separation and Miscibility in the Condensed Phase of a Mixed Langmuir Monolayer

Viswanath¹,

Ka²

2004

Langmuir

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Photoreactive chiral liquid‐crystalline side‐group copolymers containing azobenzene mesogens

1992

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A series of liquid‐crystalline copolymers 1 with a chiral azobenzene moiety as photoreactive mesogenic unit was prepared. The polymers were fractionated and the mesophase behaviour of the high‐ and low‐molecular weight fractions was examined. The copolymers display smectic A and cholesteric phases. For the cholesteric phases the pitch of the helix was determined, which ranges from 3 to 20 μm. Stable monolayers at the air‐water interface were obtained from two monomers and one of the homopolymers. Multilayer assemblies of the azobenzene‐containing polymers can be used to study photo‐induced order/disorder transitions.

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Vill¹

Transition Temperatures and Related Properties of Three-Ring Systems With Two Bridging Groups

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Stabilization of monolayers and Langmuir-Blodgett films of mesogenic components by mixing

Cited by 5 publications

References 13 publications

Photoinduced Phase Separation and Miscibility in the Condensed Phase of a Mixed Langmuir Monolayer

Photoinduced Phase Separation and Miscibility in the Condensed Phase of a Mixed Langmuir Monolayer

Photoreactive chiral liquid‐crystalline side‐group copolymers containing azobenzene mesogens

References for 6

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