Photo‐Induced Phenomena in Supramolecular Azobenzene Materials

Stumpe, Joachim; Kulikovska, Olga; Goldenberg, Leonid M.; Zakrevskyy, Yuriy

doi:10.1002/9780470439098.ch2

Cited by 17 publications

(19 citation statements)

References 167 publications

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“…The optical alignment and patterning of side chain LC polymer films have been studied extensively for optical memory and photonic applications 29 30 31 32 33 . In these cases, the photoresponsive units are integrated with the LC polymer films.…”

Section: Discussionmentioning

confidence: 99%

Free-surface molecular command systems for photoalignment of liquid crystalline materials

et al. 2014

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The orientation of liquid crystal molecules is very sensitive towards contacting surfaces, and this phenomenon is critical during the fabrication of liquid crystal display panels, as well as optical and memory devices. To date, research has focused on designing and modifying solid surfaces. Here we report an approach to control the orientation of liquid crystals from the free (air) surface side: a skin layer at the free surface was prepared using a non-photoresponsive liquid crystalline polymer film by surface segregation or inkjet printing an azobenzene-containing liquid crystalline block copolymer. Both planar-planar and homoeotropic-planar mode patterns were readily generated. This strategy is applicable to various substrate systems, including inorganic substrates and flexible polymer films. These versatile processes require no modification of the substrate surface and are therefore expected to provide new opportunities for the fabrication of optical and mechanical devices based on liquid crystal alignment.

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Section: Discussionmentioning

confidence: 99%

Free-surface molecular command systems for photoalignment of liquid crystalline materials

et al. 2014

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“…A review of these materials covering the pre-2009 period has been published by Stumpe and coworkers. 52 Many more papers on this subject have been published since that review, with a number of structureproperty-function relations elucidated. Here, we review the progress made since 2009, focusing on the material design concepts for fabricating efficient photoresponsive materials through ionic, hydrogen and halogen bonding between the host polymers and small molecules.…”

Section: Scope Of This Review and Complementary Readingmentioning

confidence: 99%

Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

2018

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a Noncovalent binding of azobenzenes to polymers allows harnessing light-induced molecular-level motions (photoisomerization) for inducing macroscopic effects, including photocontrol over molecular alignment and self-assembly of block copolymer nanostructures, and photoinduced surface patterning of polymeric thin films. In the last 10 years, a growing body of literature has proven the utility of supramolecular materials design for establishing structure-property-function guidelines for photoresponsive azobenzene-based polymeric materials. In general, the bond type and strength, engineered by the choice of the polymer and the azobenzene, influence the photophysical properties and the optical response of the material system. Herein, we review this progress, and critically assess the advantages and disadvantages of the three most commonly used supramolecular design strategies:hydrogen, halogen and ionic bonding. The ease and versatility of the design of these photoresponsive materials makes a compelling case for a paradigm shift from covalently-functionalized side-chain polymers to supramolecular polymer-azobenzene complexes.

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“…Surface relief gratings were produced by holographic recording in azobenzene containing polymer films [6], [7], [8], [9]. Due to the molecular photoeffects of azobenzene a relief profile is generated on the surface of the azobenzene containing layer.…”

Section: B Surface Relief Gratingsmentioning

confidence: 99%

“…Sinusoidal one-dimensional surface relief gratings (SRG) were used as variable DOE in the experiments. The gratings were holographically recorded in a material containing azobenzene [6], [7], [8]. Efficient surface relief gratings are formed due to photo-induced mass transport, which are patterned by the holographic exposure.…”

Section: Introductionmentioning

confidence: 99%

Optical transmission gratings tuned by electro active polymers

Kollosche

Kofod

Döring

et al. 2010

2010 10th IEEE International Conference on Solid Dielectrics

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Dielectric elastomer actuators (DEA) of poly-styrene-ethylene-butadiene- styrene (SEBS) and poly-acrylic VHB4910 were studied for voltage tunable optical transmission gratings. A new geometry is proposed, in which the grating is placed in an area without electrodes, permitting for light transmission through the device. Experiments were performed to implement surface relief gratings on DEA films from pattern masters made from holographic recorded gratings. Since the actuation strain of the DEA depends strongly on the boundary conditions, the desired voltage-controllable deformation of the grating can be achieved by choosing suitable manufacturing parameters. Conditions were found permitting a relative change up to 8.5 % in a 1 m grating. A model based on independently measured material parameters is shown to describe the optical behavior

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Photo‐Induced Phenomena in Supramolecular Azobenzene Materials

Cited by 17 publications

References 167 publications

Free-surface molecular command systems for photoalignment of liquid crystalline materials

Free-surface molecular command systems for photoalignment of liquid crystalline materials

Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

Optical transmission gratings tuned by electro active polymers

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