Fluorescent Actuator Based on Microporous Conjugated Polymer with Intramolecular Stack Structure

Lee, Wang-Eun; Jin, Young-Jae; Park, Lee-Soon; Kwak, Giseop

doi:10.1002/adma.201201967

Cited by 154 publications

(113 citation statements)

References 51 publications

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“…[28][29][30][31][32] Notably, the intramolecular stack structure of the side-group phenyl rings in PDPAs is fully relaxed in the swollen state, and consequently, the fluorescence (FL) emission of PDPAs can be strongly enhanced. [33][34][35][36] Furthermore, the degree of FL increase differs significantly based on the viscosity of the diffused medium because the degree of torsion angle relaxation of the side phenyl rings is affected by the friction energy transferred from the medium to these phenyl rings. 37 Accordingly, PDPA derivatives would be potential porous organic matrices for PCMs and also exhibit an optical sensory response, as required in the present work.…”

Section: Introductionmentioning

confidence: 99%

Phase-change hybrids for thermo-responsive sensors and actuators

et al. 2014

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Highly advanced phase-change hybrids (PCHs), which consist of a phase-change material and conjugated polymer, were developed for new sensor and actuator applications. PCH films with excellent characteristics were obtained simply by depositing various molten paraffin waxes (PWs) in situ onto poly(diphenylacetylene) (PDPA) films with extremely large fractional free volumes. The phase-change enthalpy of the PWs in the hybrid films was quite high and remained constant over prolonged use. The PCH films underwent critical changes in both fluorescence (FL) intensity and color during the phase change of the PWs, which facilitated various sensor applications such as highly reversible writing/erasing, fingerprinting and array-type thermometer usage. In addition, a biaxially oriented polypropylene (BOPP)-supported PCH film exhibited extremely fast and highly reproducible thermomechanical actuation with reversible curling/uncurling during the phase change of the PWs. These findings will be useful for developing novel PCH materials with highly advanced functions and applications.

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Section: Introductionmentioning

confidence: 99%

Phase-change hybrids for thermo-responsive sensors and actuators

et al. 2014

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“…The pioneering work of Hu et al [ 16 ] regarding actuation based on differential swelling/shrinking of two layers triggered by water and temperature in a bilayer polymeric system remains the basis of thermoresponsive polymeric actuators, highly interesting for applications in tissue engineering, cell High porosity was utilized in providing fast actuation to polymeric actuators with acetone, camphor sulphonic acid, ethanol, and sodium hydroxide as solvents. [ 2,21,25 ] We recently showed the fastest temperature-triggered bilayer polymeric actuators, with a thickness of more than 100 µm and planar size of 25 × 5 mm, reversibly bending and rolling to tubes in less than 1 s. [ 26 ] But a still unresolved challenge is to control the direction of movement without sacrifi cing instant/fast reversible large-scale actuation. We addressed the issue and in this work, present a large size temperature-triggered polymeric actuator with control in the direction of movement at ultra-fast speed, i.e., ≈0.6-5 s depending upon the type of movement.…”

Section: Introductionmentioning

confidence: 99%

Giving Direction to Motion and Surface with Ultra‐Fast Speed Using Oriented Hydrogel Fibers

Liu

Jiang

Sun

et al. 2015

Adv Funct Materials

125

100

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Thermoresponsive hydrogel fibrous membranes showing directionally controlled movements and surface change with ultra‐fast speed are presented for the first time. They show reversible coiling, rolling, bending, and twisting deformations in different controllable directions for many cycles (at least 50 cycles tried) with inside‐out change in surfaces and shapes. Speed, reversibility, large‐scale deformations and, most importantly, control over the direction of deformation is required in order to make synthetic actuators inspired from natural materials or otherwise. A polymeric synthetic material combining all these properties is still awaited. This issue is addressed and provide a very simple system fulfilling all these requirements by combining porosity and asymmetric swelling/shrinking via orientation of hydrogel fibers at different angles in a fibrous membrane. Electrospinning is used as a tool for making membranes with fibers oriented at different angles.

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“…Importantly, the lifetimes of MALA(n)-films (1.47-1.59 ns) are about 1.50 times longer than APPV solution (0.60 ns), are also prolonged to nearly 2.0-fold combined with LA(n)-films' (0.66-0.81 ns), and with an increasing than MA(n)-films (1.32-1.41 ns). The dominant factor is that LDHs and MMT inorganic nonosheets can assemble EME in this nano-architecture, which can affect the vibration of backbone and extend the relaxation time, finally prolonging lifetimes [19,20]. Above all, EME is helpful to improve photoemission behaviors of multilayer films.…”

Section: Resultsmentioning

confidence: 99%

Novel Luminescent Multilayer Films Containing π-Conjugated Anionic Polymer with Electronic Microenvironment

Wang

Liu

2016

Applied Sciences

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Layered double hydroxides (LDHs), luminescent π-conjugated anionic polymer and montmorillonite (MMT) were orderly assembled into luminescent multilayer films via layer-by-layer self-assembly method. The electronic microenvironment (EME), the structure of which is like a traditional capacitor, can be constructed by exfoliated LDHs or MMT nanosheets. In addition, the rigid inorganic laminated configuration can offer stable surroundings between the interlayers. As a result, we conclude that EME can extend the luminescent lifespans of multilayer films substantially, due to affecting relaxation times of π-conjugated anionic polymer. Consequently, because of the remarkable impact on better photoemission behaviors of luminescent π-conjugated anionic polymer, EME assembled by LDHs or MMT nanosheets have had high hopes attached to them. They are expected to have the potential for designing, constructing, and investigating novel light-emitting thin films.

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Fluorescent Actuator Based on Microporous Conjugated Polymer with Intramolecular Stack Structure

Cited by 154 publications

References 51 publications

Phase-change hybrids for thermo-responsive sensors and actuators

Phase-change hybrids for thermo-responsive sensors and actuators

Giving Direction to Motion and Surface with Ultra‐Fast Speed Using Oriented Hydrogel Fibers

Novel Luminescent Multilayer Films Containing π-Conjugated Anionic Polymer with Electronic Microenvironment

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