Photo-responsive traveling of small-particles modified with azobenzene groups as molecular motors in a liquid crystal

Kuwahara, Yutaka; Oda, Taiko; Kim, Sunnam; Ogata, Toru; Kurihara, Seiji

doi:10.1016/j.matlet.2016.06.010

Cited by 14 publications

(6 citation statements)

References 27 publications

(35 reference statements)

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“…Surface interactions on colloidal particles’ surface allow for the activation of their translational or rotational motion due to facile response to light − or other external stimuli. , Among the key features allowing the transformation of passive colloidal inclusions into micromotors and micromachines are functionalization of azobenzene dye molecules on the surface of colloidal particles ,− or using azobenzene dyes in the anisotropic nematic fluid host. ,− ,− …”

Section: Liquid Crystal Colloids Fabrication Methodsmentioning

confidence: 99%

“…For thick ≥ 1 μm platelets, the optical response of azobenzene at the edge faces additionally breaks the symmetry of director distortions, which can result in the conversion of rotation into translation (Figure f). Translation of colloidal particles can also be prompted by the continuous trans–cis–trans isomerization of azobenzene attached on the particle surface, where the trans–cis–trans isomerization generates a microsized isotropic phase inducing an elastic force between nematic and isotropic phases to drive particles …”

Section: Liquid Crystal Colloids Fabrication Methodsmentioning

confidence: 99%

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Design and Preparation of Nematic Colloidal Particles

2022

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Colloidal systems are abundant in technology, in biomedical settings, and in our daily life. The so-called “colloidal atoms” paradigm exploits interparticle interactions to self-assemble colloidal analogs of atomic and molecular crystals, liquid crystal glasses, and other types of condensed matter from nanometer- or micrometer-sized colloidal building blocks. Nematic colloids, which comprise colloidal particles dispersed within an anisotropic nematic fluid host medium, provide a particularly rich variety of physical behaviors at the mesoscale, not only matching but even exceeding the diversity of structural and phase behavior in conventional atomic and molecular systems. This feature article, using primarily examples of works from our own group, highlights recent developments in the design, fabrication, and self-assembly of nematic colloidal particles, including the capabilities of preprogramming their behavior by controlling the particle’s surface boundary conditions for liquid crystal molecules at the colloidal surfaces as well as by defining the shape and topology of the colloidal particles. Recent progress in defining particle-induced defects, elastic multipoles, self-assembly, and dynamics is discussed along with open issues and challenges within this research field.

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Section: Liquid Crystal Colloids Fabrication Methodsmentioning

confidence: 99%

Section: Liquid Crystal Colloids Fabrication Methodsmentioning

confidence: 99%

Design and Preparation of Nematic Colloidal Particles

2022

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“…In the case of photoactive systems, the photochromic molecules can be dissolved either in the solution, − in the colloidal droplet, or used as a surfactant at the interface . The motion of nanoparticles can also be controlled when functionalized with photoswitches, and there are several examples where the motion is achieved in a liquid crystalline phase. − …”

Section: Motion From Photochromic Molecular Switchesmentioning

confidence: 99%

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

et al. 2019

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Precise control over molecular movement is of fundamental and practical importance in physics, biology, and chemistry. At nanoscale, the peculiar functioning principles and the synthesis of individual molecular actuators and machines has been the subject of intense investigations and debates over the past 60 years. In this review, we focus on the design of collective motions that are achieved by integrating, in space and time, several or many of these individual mechanical units together. In particular, we provide an in-depth look at the intermolecular couplings used to physically connect a number of artificial mechanically active molecular units such as photochromic molecular switches, nanomachines based on mechanical bonds, molecular rotors, and light-powered rotary motors. We highlight the various functioning principles that can lead to their collective motion at various length scales. We also emphasize how their synchronized, or desynchronized, mechanical behavior can lead to emerging functional properties and to their implementation into new active devices and materials.

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“…Apart from photo-sensitive LCEs, azobenzene has also been widely used for the preparation of photo-sensitive hydrogels, but the response behavior of azobenzene-based hydrogel was usually gel-sol phase transition [92,[133][134][135][136] instead of deformation. As a result, azobenzene-based LCEs are generally used as actuators while the equivalent hydrogels were employed for drug release.…”

Section: Photo-chemically Sensitive Hydrogelsmentioning

confidence: 99%

“…Reaction mechanism for chain transfer within the polymeric backbone[83].As one of the most common PSGs, azobenzene was extensively used for preparation of photo-sensitive LCEs[89][90][91][92][93][94]. As illustrated inFigure 2.4, the azobenzene molecule isomerized from trans to cis forms upon UV illumination and back to the original form through visual light or heat.…”

mentioning

confidence: 99%

Computational modelling and investigation of mechanical and electrochemical response of photo-sensitive hydrogels

Xiao¹

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Photo-responsive traveling of small-particles modified with azobenzene groups as molecular motors in a liquid crystal

Cited by 14 publications

References 27 publications

Design and Preparation of Nematic Colloidal Particles

Design and Preparation of Nematic Colloidal Particles

Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors

Computational modelling and investigation of mechanical and electrochemical response of photo-sensitive hydrogels

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