Anisotropy of the photo-induced translation diffusion of azobenzene dyes in polymer matrices

Lefin, Philippe; Fiorini, C.; Nunzi, Jean‐Michel

doi:10.1088/0963-9659/7/1/011

Cited by 288 publications

(235 citation statements)

References 13 publications

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“…In regime I, the motor and hosts motions depend only slightly on the force created on the environment during the folding. That result agrees with models like the caterpillar motions model [57] and the cage breaking model [47] as both models depend only slightly on the force generated by the motor. In the caterpillar model the motor's mo-tion is generated by the slithering of the motor inside the medium and thus needs only small forces.…”

Section: Forces On the Motorsupporting

confidence: 85%

Folding time dependence of the motions of a molecular motor in an amorphous medium

et al. 2017

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We investigate the dependence of the displacements of a molecular motor embedded inside a glassy material on its folding characteristic time τ f . We observe two different time regimes. For slow foldings (regime I) the diffusion evolves very slowly with τ f , while for rapid foldings (regime II) the diffusion increases strongly with τ f ( D ≈ τ −2 f ) suggesting two different physical mechanisms. We find that in regime I the motor's displacement during the folding process is counteracted by a reverse displacement during the unfolding, while in regime II this counteraction is much weaker. We notice that regime I behavior is reminiscent of the scallop theorem that holds for larger motors in a continuous medium. We find that the difference in the efficiency of the motor's motion explains most of the observed difference between the two regimes. For fast foldings the motor trajectories differ significantly from the opposite trajectories induced by the following unfolding process, resulting in a more efficient global motion than for slow foldings. This result agrees with the fluctuation theorems expectation for time reversal mechanisms. In agreement with the fluctuation theorems we find that the motors are unexpectedly more efficient when they are generating more entropy, a result that can be used to increase dramatically the motor's motion.

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Section: Forces On the Motorsupporting

confidence: 85%

Folding time dependence of the motions of a molecular motor in an amorphous medium

et al. 2017

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“…19,[67][68][69] Irradiated PS molecules undergo photooxidation and dimerization, which suppresses mobility relative to the original PS molecules. In fact, we observed a slight but definite increase in T g after irradiation (Supplementary Figure S8).…”

Section: Mechanism Of Srg Formationmentioning

confidence: 99%

Facile one-step photopatterning of polystyrene films

Ubukata

Moriya

Yokoyama

2012

Polym J

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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.

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“…The profile of the inscribed PSR structure is determined by the spatial distribution and the polarization condition of the irradiated light pattern [107]. Many models for the PSR mechanism have been proposed so far [108][109][110][111][112][113][114].…”

Section: Micro-and Nanoscale Formationsmentioning

confidence: 99%

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

2012

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Photocontrol of molecular alignment is an exceptionally-intelligent and useful strategy. It enables us to control optical coefficients, peripheral molecular alignments, surface relief structure, and actuation of substances by means of photoirradiation. Azobenzene-containing polymers and functionalized liquid crystalline polymers are well-known photocontrollable materials. In this paper, we introduce recent applications of these materials in the fields of mechanics, self-organized structuring, mass transport, optics, and photonics. The concepts in each application are explained based on the mechanisms of photocontrol. The interesting natures of the photocontrollable materials and the conceptual applications will stimulate novel ideas for future research and development in this field.

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Anisotropy of the photo-induced translation diffusion of azobenzene dyes in polymer matrices

Cited by 288 publications

References 13 publications

Folding time dependence of the motions of a molecular motor in an amorphous medium

Folding time dependence of the motions of a molecular motor in an amorphous medium

Facile one-step photopatterning of polystyrene films

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

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