Microphase separated structures of block copolymer thin film with non-volatile selective solvent

Yamamoto, Katsuhiro; Umegaki, Naoya; Matsutani, Taito; Takagi, Hideaki; Ito, Eri; Sakurai, Shinichi

doi:10.1088/1757-899x/14/1/012002

Cited by 2 publications

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References 14 publications

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“…Moreover, the lattice size and its temperature dependence for the light-induced Cub bi phase were investigated by GI-XRD. 45,46 Interestingly, the lattice size of the light-induced Cub bi phase almost coincides with the extrapolated value obtained from the temperature dependence for the thermally induced Cub bi phase. This implies that the intermolecular interactions and periodic structures are similar between these two Cub bi phases having different origins (i.e., light-induced and thermally induced).…”

Section: Introductionsupporting

confidence: 78%

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Phase Structure and Phase Transition Mechanism for Light-Induced Ia3d Cubic Phase in 4′-n-Docosyloxy-3′-nitrobiphenyl-4-carboxlic acid/Ethyl 4-(4′-n-docosyloxyphenylazo)benzoate Binary Mixture

et al. 2014

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The light-induced smectic C (SmC) to bicontinuous cubic (Cub(bi)) phase transition was investigated using grazing-incidence X-ray diffraction (GI-XRD) and Fourier transform infrared (FT-IR) spectroscopy to elucidate the mechanism at the molecular level. The sample was a binary mixture of 4'-n-docosyloxy-3'-nitrobiphenyl-4-carboxylic acid with an azobenzene derivative having a similar structure. The GI-XRD analysis revealed that the lattice size of the light-induced Cub(bi) phase almost coincides with the extrapolated value of the thermally induced one to the irradiation temperature. The FT-IR analysis also showed that the UV irradiation shifts the peak positions toward their extrapolated wavenumbers that would be displayed by the thermally induced Cub(bi) phase at the temperature. These results indicate that both the molecular state and periodic structure realized by the irradiation may be regarded as the "postulated" state and periodic structure of thermally induced Cub(bi) phase at the temperature. This leads to a conclusion that the trans-cis photoisomerization of the azobenzene derivatives in the mixture gives rise to destabilization of the SmC phase with layered structure, alternatively favoring the formation of the Cub(bi) phase with a twisted molecular arrangement.

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Section: Introductionsupporting

confidence: 78%

“…GI-XRD measurements were carried out at the Photon Factory (PF) beamline BL-6A of the high-energy accelerator research organization (KEK), Tsukuba, Japan. , The wavelength λ of the X-rays was 0.15 nm, and α-stearic acid and silver behenate was used as standard materials for the calibration. The sample-to-detector distance was ca.…”

Section: Methodsmentioning

confidence: 99%

Phase Structure and Phase Transition Mechanism for Light-Induced Ia3d Cubic Phase in 4′-n-Docosyloxy-3′-nitrobiphenyl-4-carboxlic acid/Ethyl 4-(4′-n-docosyloxyphenylazo)benzoate Binary Mixture

et al. 2014

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Light‐Driven Phase Transition in a Cubic‐Phase‐Forming Binary System Composed of 4′‐n‐Docosyloxy‐3′‐nitrobiphenyl‐4‐carboxylic Acid and an Azobenzene Derivative

Hori

Furukawa

Yamamoto

et al. 2012

Chemistry A European J

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Binary mixtures were prepared from an azobenzene derivative and a liquid-crystal (LC) compound that exhibits smectic C (SmC) and bicontinuous cubic (Cub(bi)) LC phases. Reversible switching between the two phases in response to UV-light irradiation was observed. This light-driven SmC-to-Cub(bi) transition is the first example showing the increased dimensionality of molecular ordering with isomerization of azobenzenes (see figure).

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Microphase separated structures of block copolymer thin film with non-volatile selective solvent

Cited by 2 publications

References 14 publications

Phase Structure and Phase Transition Mechanism for Light-Induced Ia3d Cubic Phase in 4′-n-Docosyloxy-3′-nitrobiphenyl-4-carboxlic acid/Ethyl 4-(4′-n-docosyloxyphenylazo)benzoate Binary Mixture

Phase Structure and Phase Transition Mechanism for Light-Induced Ia3d Cubic Phase in 4′-n-Docosyloxy-3′-nitrobiphenyl-4-carboxlic acid/Ethyl 4-(4′-n-docosyloxyphenylazo)benzoate Binary Mixture

Light‐Driven Phase Transition in a Cubic‐Phase‐Forming Binary System Composed of 4′‐n‐Docosyloxy‐3′‐nitrobiphenyl‐4‐carboxylic Acid and an Azobenzene Derivative

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