Relationship between molecular structure and photoinduced surface relief grating formation using azobenzene-based photochromic amorphous molecular materials

Nakano, Hideyuki; Tanino, Takahiro; Takahashi, Tôru; Ando, Hiroyuki; Shirota, Yasuhiko

doi:10.1039/b713400b

Cited by 94 publications

(75 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This temperature dependence is probably due to competition between increasing molecular mobility and the smoothing effect of surface tension 58,59 with increasing temperature. 60 The PS films with much higher M w also exhibited similar tendency regarding temperature dependence, and efficient maximum mass transfer was observed at B40 K higher than the associated T g value (Supplementary Figure S3). Thus, it is demonstrated that this SRG formation method can be applied to PS films of various molecular weights.…”

Section: Temperature Dependence Of Srg Topologymentioning

confidence: 77%

Facile one-step photopatterning of polystyrene films

Ubukata

Moriya

Yokoyama

2012

Polym J

View full text Add to dashboard Cite

The development of nano-and micropatterned materials is a key component of advanced nanotechnology. We report herein, a photo-based method for patterning general-purpose polymer films. Patterned ultraviolet (UV) light irradiation of a thin polystyrene film under controlled temperature generates surface relief structures by mass transfer from shaded to irradiated areas. The resulting surface relief structure can be arbitrarily erased by heating and reconstructed by patterned UV light irradiation, and this process is repeatable. This new method thus enables fabrication of dynamic reversible patterning structures from various general polymers.

show abstract

Section: Temperature Dependence Of Srg Topologymentioning

confidence: 77%

Facile one-step photopatterning of polystyrene films

Ubukata

Moriya

Yokoyama

2012

Polym J

View full text Add to dashboard Cite

show abstract

“…The growing rate of RL was found to increase with increasing temperature. We have reported that the photoinduced SRG formation took place using azobenzene-based photochromic amorphous molecular materials and the modulation depth of obtained SRG became larger with decreasing temperature because lowering the temperature reduced the fluidity of the materials preventing collapse of the SRG by surface tension [21]. Similarly, we have also reported that the elongation of the glass particles of azobenzenebased photochromic amorphous molecular materials fixed in agar gel took place upon irradiation with a linearly polarized laser beam and the rate of elongation increased with decreasing temperature due to increase in fluidity with increasing temperature to make the particles to shrink by surface tension [27].…”

Section: Resultsmentioning

confidence: 99%

Photoinduced Change in Phase-Separated Structure of a Binary Film Composed of 4-[Bis(9,9-dimethylfluoren-2-yl)amino]-4'-nitroazobenzene and Poly(vinyl acetate)

Ichikawa

Nakano

2017

J. Photopol. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

In due course of our studies on photomechanical effects observed for azobenzene-based photochromic amorphous molecular materials, photoinduced change in phase-separated structure of an amorphous binary film composed of title materials has been investigated in the present study. When the phase-separated film was irradiated with a linearly polarized laser beam, the circular domains in the film extended in the direction parallel to the polarization direction of the incident laser beam. The rate of such photoinduced extension was found to increase with increasing temperature. The result seemed to be contrary to the results of the temperature dependences of other photomechanical effects observed for photochromic amorphous molecular materials we have previously reported.Azomolecules were suggested to exist both in the domains and in their surroundings and it is of importance to consider the both effects of azo-molecules existed in the domains and in their surroundings for phase-separated binary systems.

show abstract

“…Among these, azobenzne-based photochromic amorphous molecular materials were found to exhibit trans-cis photo-isomerization reactions as amorphous films as well as in solutions [15,18]. In addition, several photomechanical effects of azobenzene-based photochromic amorphous molecular materials and crystalline materials caused by photoinduced mass transport have been found [20][21][22][23][24][25][26][27][28][29]. In our previous communication [27], we have reported that the photomechanical bending motions of a microfiber composed of an azobenzene-based photochromic molecular materials, which we refer to as "photochromic molecular fiber", using 4-bis[(9,9-dimethylfluroren-2-yl)amino]azobenzene (BFlAB), and that the bending direction of the fiber could be controlled by altering the polarization direction of the irradiated light.…”

Section: Open Accessmentioning

confidence: 99%

Photomechanical Bending of Azobenzene-Based Photochromic Molecular Fibers

2013

Self Cite

View full text Add to dashboard Cite

Microfibers composed of azobenzene-based photochromic amorphous molecular materials, namely low molecular-mass photochromic materials with a glass-forming property, could be fabricated. These fibers were found to exhibit mechanical bending motion upon irradiation with a laser beam. In addition, the bending direction could be controlled by altering the polarization direction of the irradiated light without changing the position of the light source or the wavelength of the light. In-situ fluorescence observation of mass transport induced at the surface of the fiber doped with CdSe quantum dots suggested that the bending motions were related with the photoinduced mass transport taking place near the irradiated surface of the fiber.

show abstract

Relationship between molecular structure and photoinduced surface relief grating formation using azobenzene-based photochromic amorphous molecular materials

Cited by 94 publications

References 44 publications

Facile one-step photopatterning of polystyrene films

Facile one-step photopatterning of polystyrene films

Photoinduced Change in Phase-Separated Structure of a Binary Film Composed of 4-[Bis(9,9-dimethylfluoren-2-yl)amino]-4'-nitroazobenzene and Poly(vinyl acetate)

Photomechanical Bending of Azobenzene-Based Photochromic Molecular Fibers

Contact Info

Product

Resources

About