Photomechanical Liquid Crystalline Polymers: Motion in Response to Light

Yu, Haifeng; Li, Quan

doi:10.1002/9781118680469.ch7

Cited by 8 publications

(7 citation statements)

References 59 publications

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“…Then the lm slowly bent towards the light source as shown in Video S2, † which is far difference from the liquid-crystalline polymer lms showing an anisotropic ordering of mesogens with a cooperative effect. [1][2][3][4][5][12][13][14][15][16][17]40 This change in shape of the bilayer was due to the volume expansion of the A12AzPy/PVA layer caused by the light-to-thermal energy conversion. [1][2][3][4][5]41,42 Since little change was produced in the pure PVA layer because of no photoresponsvie chromophores existed inside, the bilayer lm bent towards to the actinic light source following the bimetal mechanism, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][12][13][14][15][16][17]40 This change in shape of the bilayer was due to the volume expansion of the A12AzPy/PVA layer caused by the light-to-thermal energy conversion. [1][2][3][4][5]41,42 Since little change was produced in the pure PVA layer because of no photoresponsvie chromophores existed inside, the bilayer lm bent towards to the actinic light source following the bimetal mechanism, as shown in Fig. 5c.…”

Section: Resultsmentioning

confidence: 99%

“…Light irradiation is a fascinating tool to adjust material properties, which can be controlled remotely, instantly and precisely. [1][2][3][4][5] When matter absorbs light, thermal energy is oen produced due to the energy conversion from photons of the actinic light. This is so-called photothermal effect, which includes a wide range of techniques and phenomena through the conversion of absorbed light into thermal energy.…”

Section: Introductionmentioning

confidence: 99%

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Photothermal effect of azopyridine compounds and their applications

Chen

Quan

et al. 2015

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photothermal effect of azopyridine compounds and their applications

Chen

Quan

et al. 2015

RSC Adv.

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“…Polymers prepared from mesogenic functional monomers often exhibit liquid crystalline phase behavior (178)(179)(180)(181)(182)(183)(184)(185). However, many block copolymers without mesogenic units in their structure also show liquid crystalline properties due to nanosegregation of incompatible blocks into distinct subspace.…”

Section: Polymeric Liquid Crystalsmentioning

confidence: 99%

Liquid Crystals

Bisoyi

2014

Kirk-Othmer Encyclopedia of Chemical Technology

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Liquid crystals (LCs) represent a state of matter which is characterized by a unique combination of order and mobility on molecular, supramolecular and macroscopic levels. This is a true thermodynamic stable state of matter and has been recognized and accepted as the fourth state of matter after solid, liquid, and gas (1-18). They have developed from a mere scientific curiosity in the beginning to one of the foundations of mobile information technology devices today (19)(20)(21)(22)(23)(24)(25). LCs are presently common topics in academic books and also in our daily life. Terms such as LCD, ie, LC display, and Kevlar have become familiar consumer products. The unusual feature which makes this state of matter unique among the others is the combination of orientational (and, sometimes, positional) order and dynamics, giving rise to materials with anisotropic physical properties that are switchable under the influence of small external stimuli. LCs have been regarded as unique functional soft materials from both scientific and technological point of view. The unique combination of counterintuitive properties, ie, order and fluidity, is not only an essential requirement for living matter, but also it is the foundation of the numerous technological applications of LC materials. Simultaneous exhibition of order and dynamics is the basic principle for self-organization and structure formation in living systems. Accordingly, LCs play a crucial role in living systems and in biology (18). For example, no life would be possible without the ordered and dynamic self-assembly of lipids into bilayers within the cell membrane. Several biological molecules such as lipids, carbohydrates, proteins, and nucleic acids have been found to exist in various liquid crystalline phases (26-34). The appearance of mesomorphism in DNAs has been related to the significant role that LCs would have played in the evolution of biological information in the pre-biotic world (35-38). LCs self-assemble into various structures with the help of many different types of molecular interactions such as van der Waals, dipolar and quadrupolar interaction, charge transfer, p-p interaction, metal coordination, and hydrogen bonding. Thus, LCs can be considered as prototype supramolecular systems which furnish well-defined self-assembled architectures using noncovalent secondary interactions (39). Scientifically, the LC field is a fertile ground to study supramolecular self-assembly of matter and soft materials. Moreover, LCs persuasively demonstrate the powerful organization principle of matter by maximizing the interaction energy and minimizing the excluded volume.Overall, LCs have developed into a fascinating and prosperous field, reaching out into different areas of science by providing basic knowledge of the fundamental rules governing self-assembly from simple to complex modes. The domains of LCs span across multiple disciplines of pure and applied science including optics, materials science, bioscience, nanoscience etc. Their science and technology are tru...

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“…Photoresponsive liquid-crystalline polymers (LCPs) are a kind of rewritable material that can be applied extensively in optical storage, optical switching, photodriven devices, photomechanical elastomers, and photocontrollable nanofabrication. [1][2][3][4][5][6][7][8][9][10][11][12] These applications are based on the unique features of LCPs, where the rod-like mesogens with a strong birefringence can be well aligned on the surface of mechanically rubbed polyimide lm and destroyed or erased by laser illuminations within their absorption spectra. [4][5][6]13,14 However, the erased ordering of liquid crystal (LC) orientation may be reconstructed in the polymer lm by further mechanical rubbing processes or photoalignment treatment.…”

Section: Introductionmentioning

confidence: 99%

Erasable thin-film optical diode based on a photoresponsive liquid crystal polymer

et al. 2014

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We report a thin-film optical diode written into thin films of a liquid-crystalline polymer (LCP), which is based on the photoinduced LC-to-isotropic phase transition of LCPs. The interference pattern between a collimated and a focused UV laser beam is imprinted as chirped volume-phase gratings in photoresponsive LCP films and no further processing steps like development or liftoff are required for the fabrication. The resultant thin-film device not only possesses the fundamental functions of an optical lens for laser beam focusing, but also shows diode effects with the focusing/defocusing function dependent on the direction of light incidence and orientation of the device. Furthermore, this photonic thin-film lens exhibits a spatially tunable spectroscopic response, revealing a unique physics of secondary excitations of resonance modes of the single-layer LCP waveguide grating structures. This reveals the mechanisms for the focusing/defocusing of laser beams by chirped grating structures. Erasability and reconstructibility of the photoresponsive LCPs guarantee rewritability of the thin-film diode lens.

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Photomechanical Liquid Crystalline Polymers: Motion in Response to Light

Cited by 8 publications

References 59 publications

Photothermal effect of azopyridine compounds and their applications

Photothermal effect of azopyridine compounds and their applications

Liquid Crystals

Erasable thin-film optical diode based on a photoresponsive liquid crystal polymer

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