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A Unified Material Description for Light Induced Deformation in Azobenzene Polymers.

Bin J, Oates WS - Sci Rep (2015)

Bottom Line: It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law.The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior.The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

View Article: PubMed Central - PubMed

Affiliation: Florida Center for Advanced Aero Propulsion (FCAAP), Department of Mechanical Engineering, Florida State University. Tallahassee, FL, 32310, USA.

ABSTRACT
Complex light-matter interactions in azobenzene polymers have limited our understanding of how photoisomerization induces deformation as a function of the underlying polymer network and form of the light excitation. A unified modeling framework is formulated to advance the understanding of surface deformation and bulk deformation of polymer films that are controlled by linear or circularly polarized light or vortex beams. It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law. The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior. The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

No MeSH data available.


Description of a linearly polarized Gauss laser beam exposed to the material.Similar beam sources are used for the case of circular polarized beams and vortex beams.
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f5: Description of a linearly polarized Gauss laser beam exposed to the material.Similar beam sources are used for the case of circular polarized beams and vortex beams.

Mentions: We apply the same model to quantify complex surface texture changes from Gaussian beams circularly polarized and vortex beams with different topological charge. In the visible light regime, trans-cis-trans photoisomerization leads to more complicated evolution of the azobenzene microstructure as the trans state molecules reorient orthogonal to the polarized laser beam. In all simulations, the azo-polymer film is taken in a polydomain configuration as the initial reference state and exposed to a laser beam as illustrated in Fig. 5. The photostrictive coefficients assume short spacers between the azobenzene and main chain within the polymer network.


A Unified Material Description for Light Induced Deformation in Azobenzene Polymers.

Bin J, Oates WS - Sci Rep (2015)

Description of a linearly polarized Gauss laser beam exposed to the material.Similar beam sources are used for the case of circular polarized beams and vortex beams.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4594130&req=5

f5: Description of a linearly polarized Gauss laser beam exposed to the material.Similar beam sources are used for the case of circular polarized beams and vortex beams.
Mentions: We apply the same model to quantify complex surface texture changes from Gaussian beams circularly polarized and vortex beams with different topological charge. In the visible light regime, trans-cis-trans photoisomerization leads to more complicated evolution of the azobenzene microstructure as the trans state molecules reorient orthogonal to the polarized laser beam. In all simulations, the azo-polymer film is taken in a polydomain configuration as the initial reference state and exposed to a laser beam as illustrated in Fig. 5. The photostrictive coefficients assume short spacers between the azobenzene and main chain within the polymer network.

Bottom Line: It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law.The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior.The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

View Article: PubMed Central - PubMed

Affiliation: Florida Center for Advanced Aero Propulsion (FCAAP), Department of Mechanical Engineering, Florida State University. Tallahassee, FL, 32310, USA.

ABSTRACT
Complex light-matter interactions in azobenzene polymers have limited our understanding of how photoisomerization induces deformation as a function of the underlying polymer network and form of the light excitation. A unified modeling framework is formulated to advance the understanding of surface deformation and bulk deformation of polymer films that are controlled by linear or circularly polarized light or vortex beams. It is shown that dipole forces strongly respond to polarized light in contrast to higher order quadrupole forces that are often used to describe surface relief grating deformation through a field gradient constitutive law. The modeling results and comparisons with a broad range of photomechanical data in the literature suggest that the molecular structure of the azobenzene monomers dramatically influences the photostrictive behavior. The results provide important insight for designing azobenzene monomers within a polymer network to achieve enhanced photo-responsive deformation.

No MeSH data available.