Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

Vapaavuori, Jaana; Bazuin, C. Géraldine; Priimägi, Arri

doi:10.1039/c7tc05005d

Cited by 107 publications

(84 citation statements)

References 165 publications

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“…Recently, there has been an increasing interest in studying phenomena associated with transformation of light energy into mechanical motion or work, such as photoactuation . The fundamental importance of these phenomena occurring under the action of light, such as photofluidization, photoimmobilization, formation of surface relief gratings, and other complex 3D structures can help to develop photoresponsive materials for versatile applications and will also improve and extend our knowledge in soft matter.…”

Section: Introductionmentioning

confidence: 99%

Photocontrollable Deformations of Polymer Particles in Elastic Matrix

Ryabchun

Bobrovsky

2019

Advanced Optical Materials

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into mechanical motion or work, such as photoactuation. [1][2][3][4][5] The funda mental importance of these phenomena occurring under the action of light, such as photofluidization, [6][7][8][9][10][11] photoimmo bilization, [6,12,13] formation of surface relief gratings, [14][15][16][17] and other complex 3D structures [10,[18][19][20][21][22][23][24] can help to develop photo responsive materials for versatile applications and will also improve and extend our knowledge in soft matter.The most extensively studied photo active materials usually contain azoben zene moieties as the lightresponsive unit. The properties of azobenzene such as high quantum yield and reversibility of E-Z photoisomerization, high fatigue resis tance, and large changes in molecular shape and dipole moment upon isomerization make it uniquely suitable as an active unit. Molecular shape changes of azobenzene can be harnessed on a macroscopic level by the embedding active molecules into hierarchically organized matter [25] and by confinement of the photoactive material in space, such as, spherical colloids which can selfassemble into 2D and 3D structures (photonic crys tals). The preparation and study of spherical micrometersized particles based on azobenzene polymers have been reported in a number of recent works revealing the importance for various optical microdevices, photonics, microfluidics, etc. [26][27][28][29][30][31][32][33][34][35][36][37][38] It has been demonstrated that polarized light irradiation results in elongation of these particles along the light polarization. Despite the interest to the research area, several issues like the mechanism and reversibility of microscopic shape changes are still elusive. Moreover, there are no reports on the influence of liquid crystal line (LC) ordering on the shapeshifting and optical properties of the particles, as well as the operation of microparticles has never been exploited to build materials with macroscopic functionalities.In the current work, we have developed a novel elastic composite material containing shapereconfigurable parti cles based on liquid crystalline polymer. We have used sty rene-ethylene-butylene-styrene triblock copolymer (SEBS, Figure 1a) as the elastic matrix which provides large deforma tion and low mechanical stiffness [39] and does not interfere to the deformation of embedded particles. Another important role of the matrix is its elasticity responsible for the compres sive forces experienced by the deformed particles which makes possible the shape to recover. The particles are made of liquid crystal copolymer PAAzo bearing mesogenic and azobenzene One of the key challenges of material science currently is the design of multifunctional "smart" materials combining features from both molecular and supramolecular levels. Pursuing the strategy of amplification and transduction of light-induced motion of small molecules (photoswitches) across increasing length scales to macroscopic level, a novel polymer composite based on shapereconfigurable microparticles is desig...

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Section: Introductionmentioning

confidence: 99%

Photocontrollable Deformations of Polymer Particles in Elastic Matrix

Ryabchun

Bobrovsky

2019

Advanced Optical Materials

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“…2a). 61,62 Thus with these results, we can state that the erasure of the surface relief grating of Pazo polymer can be done quite easily and fast (160 seconds of irradiation at room temperature) using the IP shiing method (Fig. 3), with single beam the procedure takes 20 hours and does not result in complete elimination of the grating, while the thermal erasure is not possible at all.…”

Section: Erasing a Srg Pattern With A Single Laser Beammentioning

confidence: 71%

Light induced reversible structuring of photosensitive polymer films

Jelken

Santer

2019

RSC Adv.

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“…[17] Light responsivity is typically obtained by dispersing or chemically binding photoactive units within the polymer network. [19,20] Such a photoisomerization is crucial in triggering the so-called directional photofluidization [21,22] and induce deformation effects in azopolymers, [23,24] which have been extensively exploited as a fabrication mean to reversibly inscribe/erase surface relieves (SR) on continuous, homogenous planar films. [19,20] Such a photoisomerization is crucial in triggering the so-called directional photofluidization [21,22] and induce deformation effects in azopolymers, [23,24] which have been extensively exploited as a fabrication mean to reversibly inscribe/erase surface relieves (SR) on continuous, homogenous planar films.…”

Section: Doi: 101002/advs201801826mentioning

confidence: 99%

Driving Cells with Light‐Controlled Topographies

et al. 2019

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Cell–substrate interactions can modulate cellular behaviors in a variety of biological contexts, including development and disease. Light‐responsive materials have been recently proposed to engineer active substrates with programmable topographies directing cell adhesion, migration, and differentiation. However, current approaches are affected by either fabrication complexity, limitations in the extent of mechanical stimuli, lack of full spatio‐temporal control, or ease of use. Here, a platform exploiting light to plastically deform micropatterned polymeric substrates is presented. Topographic changes with remarkable relief depths in the micron range are induced in parallel, by illuminating the sample at once, without using raster scanners. In few tens of seconds, complex topographies are instructed on demand, with arbitrary spatial distributions over a wide range of spatial and temporal scales. Proof‐of‐concept data on breast cancer cells and normal kidney epithelial cells are presented. Both cell types adhere and proliferate on substrates without appreciable cell damage upon light‐induced substrate deformations. User‐provided mechanical stimulation aligns and guides cancer cells along the local deformation direction and constrains epithelial colony growth by biasing cell division orientation. This approach is easy to implement on general‐purpose optical microscopy systems and suitable for use in cell biology in a wide variety of applications.

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Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

Cited by 107 publications

References 165 publications

Photocontrollable Deformations of Polymer Particles in Elastic Matrix

Photocontrollable Deformations of Polymer Particles in Elastic Matrix

Light induced reversible structuring of photosensitive polymer films

Driving Cells with Light‐Controlled Topographies

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