Synthesis of ordered photoresponsive azobenzene–siloxane hybrids by self-assembly

Guo, Sufang; Sugawara‐Narutaki, Ayae; Okubo, Tatsuya; Shimojima, Atsushi

doi:10.1039/c3tc30587b

Cited by 25 publications

(18 citation statements)

References 42 publications

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“…Macromolecular-Ordering Transitions. Polymer films with azobenzene side-chain groups often form smectic or lamellar structures with an out-of-plane side-chain arrangement (35,36), exhibiting characteristic side-chain interdigitation due to the π-π stacking of azobenzene groups (37). Upon UV light illumination, these interchain π-π interactions decrease dramatically with the torsional rotation of the azobenzene groups (19).…”

Section: Significancementioning

confidence: 99%

Light-triggered thermal conductivity switching in azobenzene polymers

Shin

Sung

Kang

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

118

108

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Materials that can be switched between low and high thermal conductivity states would advance the control and conversion of thermal energy. Employing in situ time-domain thermoreflectance (TDTR) and in situ synchrotron X-ray scattering, we report a reversible, light-responsive azobenzene polymer that switches between high (0.35 W m−1K−1) and low thermal conductivity (0.10 W m−1K−1) states. This threefold change in the thermal conductivity is achieved by modulation of chain alignment resulted from the conformational transition between planar (trans) and nonplanar (cis) azobenzene groups under UV and green light illumination. This conformational transition leads to changes in the π-π stacking geometry and drives the crystal-to-liquid transition, which is fully reversible and occurs on a time scale of tens of seconds at room temperature. This result demonstrates an effective control of the thermophysical properties of polymers by modulating interchain π-π networks by light.

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Section: Significancementioning

confidence: 99%

Light-triggered thermal conductivity switching in azobenzene polymers

Shin

Sung

Kang

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

118

108

View full text Add to dashboard Cite

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“…It can also be applied as a valuable method to analyze the dynamic process of azobenzene trans-cis photoisomerization and a useful technique for UV imaging in biochips [15]. Moreover, this method can be used at other wavelength aside from 365 nm using polymers with different chemical structures [14]. One weakness that may limit the applications is the distributed area of UV light which should be smaller than the area projected by the incident light.…”

Section: Discussionmentioning

confidence: 99%

Ultraviolet Imaging Based on Surface Plasmon Resonance With Azo-Polymer Sensing Layer

Zhang

Wang

et al. 2015

IEEE Photon. Technol. Lett.

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An innovative surface plasmon resonance (SPR) sensor is constructed to achieve ultraviolet (UV) imaging. The SPR sensor is fabricated using a gold-coated prism, which is then overlaid with an azo-polymer film as a UV sensing layer. The refractive index of the azo-polymer decreases during UV light irradiation. The changes of the refractive index influence the intensity of the light reflected from the SPR sensor. With a CCD camera, both the images of the light beams reflected from the SPR sensor before and after UV irradiation are recorded. The shape of UV light beam intensity distribution can then be calculated by comparing the difference between these two images.

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“…Compared to post‐functionalized silica, SSQs show a uniform and high coverage of organic groups, which imparts unique functionality, which is quite suitable for a range of applications. SSQs with functional organic groups can be used to design and fabricate SSQ‐containing hybrid nanomaterials by being grafted onto polymers or copolymerized with polymers …”

Section: General Features Of Ssqsmentioning

confidence: 99%

“…SSQs with functional organic groups can be used to design and fabricate SSQ-containing hybrid nanomaterials by being grafted onto polymers or copolymerized with polymers. [19,20] The performance of SSQs is determined not only by the initial monomer structure, but also the synthetic condition. [6] In a sol-gel process, SSQs are synthesized from the hydrolysis and polycondensation of trialkoxysilane or trichlorosilane.…”

Section: Chemical Structuresmentioning

confidence: 99%

Silsesquioxane‐Containing Hybrid Nanomaterials: Fascinating Platforms for Advanced Applications

Dong

2019

Macro Chemistry & Physics

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Silsesquioxanes (SSQs), with the general formula, (RSiO1.5)n—where R stands for an organic group, such as alkyl, aryl, alkoxy, or H—are a type of molecular‐level organic/inorganic hybrid silica‐based material. These materials contain reactive or nonreactive organic moieties as well as inorganic Si–O–Si frameworks. In the past few years, extensive efforts have been made using SSQs to construct multifunctional nanocomposites with suitable properties for a range of applications. In this review, the recent various applications of SSQ‐containing hybrid materials are discussed, in addition to updates of the nanocomposite applications. Various physical structures and chemical reactions in SSQ‐based hybrid nanomaterials are emphasized with regard to applications in the field of polymer nanocomposites, catalysts, adsorption, sensors, and biomedicine. This review focuses on results reported in the recent five years (2013–2018).

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Synthesis of ordered photoresponsive azobenzene–siloxane hybrids by self-assembly

Cited by 25 publications

References 42 publications

Light-triggered thermal conductivity switching in azobenzene polymers

Light-triggered thermal conductivity switching in azobenzene polymers

Ultraviolet Imaging Based on Surface Plasmon Resonance With Azo-Polymer Sensing Layer

Silsesquioxane‐Containing Hybrid Nanomaterials: Fascinating Platforms for Advanced Applications

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