Phase-change hybrids for thermo-responsive sensors and actuators

Jin, Young-Jae; Kim, Beomsu Shin-Il; Lee, Wang-Eun; Lee, Chang‐Lyoul; Kim, Hyojin; Song, Kwonsik; Jang, Sung‐Yeon; Kwak, Giseop

doi:10.1038/am.2014.94

Cited by 45 publications

(34 citation statements)

References 61 publications

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“…The early studies showed that polydiphenylacetylene (PDPA)-paraffi n wax composites display a signifi cant decrease in the fl uorescence intensity near the melting temperature of the wax upon heating. [ 49,50 ] The temperature-dependent colorimetric response of the PCDA-derived PDA-wax composite was also probed by using Raman spectroscopy. In the Raman spectrum ( Figure 4 ), bands associated with conjugated alkyne-alkene groups in the bluephase PDA appear at 2082 (C C) and 1451 cm −1 (C C), respectively.…”

Section: B) As Inspection Ofmentioning

confidence: 99%

Mechanically Drawable Thermochromic and Mechanothermochromic Polydiacetylene Sensors

Chae

Lee

Kim

2016

Adv Funct Materials

115

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Recently, the development of directly writable techniques for depositing functional materials on solid substrates has received great attention. These pen-on-paper approaches enable generation of diverse patterned images on solid substrates in a fl exible, easy handling, and inexpensive manner. Herein, the development of a directly writable conjugated polymer is described. Mechanically, drawable colorimetric polydiacetylene (PDA)-wax composites are readily fabricated by using a simple mixing-molding method. Images are mechanically drawn on a paper substrate using the PDA-wax composites, display thermochromism, and mechanothermochromism. The thermochromic transition temperature is dependent on the melting point of the wax and, as a result, can be precisely controlled by the type of wax used. Optical microscopic analysis shows that formation of the DA-wax composite involves movement of wax molecules into a single diacetylene (DA) crystal. This process results in growth of the crystal. Importantly, the PDA crystal, obtained after UV light irradiation, undergoes signifi cant shrinkage upon heating because of the release of monomers and the embedded wax molecules from the crystal. The release of these molecules creates void in the PDA supramolecules, allowing the PDA chains to undergo C-C bond rotation and hence the blue-to-red color transition.

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Section: B) As Inspection Ofmentioning

confidence: 99%

Mechanically Drawable Thermochromic and Mechanothermochromic Polydiacetylene Sensors

Chae

Lee

Kim

2016

Adv Funct Materials

115

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“…In [200], a paraffin-based valve suitable for use in a bendable lab-on-a-foil system is presented, together with an assessment of different actuator layer concepts for generation of large-volume strokes in layered modular systems. The major drawback of PCAs, the slow response time, may be overcome with the help of newly developed PCA composites, for example, compounds of paraffin and vertically aligned CNT films designed for large stroke actuators [201] or hybrids of PCA materials and conjugated polymers for fast thermomechanical actuation [202].…”

Section: Conjugated Polymersmentioning

confidence: 99%

Stimulus-active polymer actuators for next-generation microfluidic devices

Hilber

2016

Appl. Phys. A

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Microfluidic devices have not yet evolved into commercial off-the-shelf products. Although highly integrated microfluidic structures, also known as lab-on-a-chip (LOC) and micrototal-analysis-system (lTAS) devices, have consistently been predicted to revolutionize biomedical assays and chemical synthesis, they have not entered the market as expected. Studies have identified a lack of standardization and integration as the main obstacles to commercial breakthrough. Soft microfluidics, the utilization of a broad spectrum of soft materials (i.e., polymers) for realization of microfluidic components, will make a significant contribution to the proclaimed growth of the LOC market. Recent advances in polymer science developing novel stimulus-active soft-matter materials may further increase the popularity and spreading of soft microfluidics. Stimulus-active polymers and composite materials change shape or exert mechanical force on surrounding fluids in response to electric, magnetic, light, thermal, or water/solvent stimuli. Specifically devised actuators based on these materials may have the potential to facilitate integration significantly and hence increase the operational advantage for the end-user while retaining costeffectiveness and ease of fabrication. This review gives an overview of available actuation concepts that are based on functional polymers and points out promising concepts and trends that may have the potential to promote the commercial success of microfluidics.

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“…Very unique functional PCM-based hybrid materials, which act as a thermoresponsive sensor or a thermomechanical actuator, were recently developed by our research group. 108 Hybrid films were prepared simply by depositing various paraffin waxes in situ onto the p-C1-PDPA film. The phase-change enthalpy of the paraffin waxes therein was quite high and remained constant over prolonged use.…”

Section: In Situ Infiltration To Pdpa-paraffin Wax Hybridsmentioning

confidence: 99%

“…The supplementary movies from the original paper may help readers to understand our results more easily. 108 6. Applications 6.1 Sensors…”

Section: In Situ Infiltration To Pdpa-paraffin Wax Hybridsmentioning

confidence: 99%

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Properties, Functions, Chemical Transformation, Nano-, and Hybrid Materials of Poly(diphenylacetylene)s toward Sensor and Actuator Applications

Jin

Kwak

2016

Polymer Reviews

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This review examines poly(diphenylacetylene)s (PDPAs) as a special class of conjugated polymers. Various properties of PDPAs, including liquid crystallinity, fluorescence (FL) emission, and chirality are described in detail. The FL origin of PDPAs is intramolecular excimer emission that comes from the intramolecular stack structure of side phenyl rings. PDPAs show remarkable FL responses to external stimuli such as solvents, heat, surface tension, and pressure. PDPAs are easily transformed to desired forms via polymer reactions, chiral solvent annealing, and coupling with long alkyl chains. Very useful nanomaterials and hybrid materials can be prepared by chain quenching and in situ hybridization methods. PDPAs and their nanoand hybrid materials show highly advanced functions toward sensors and actuators.

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Phase-change hybrids for thermo-responsive sensors and actuators

Cited by 45 publications

References 61 publications

Mechanically Drawable Thermochromic and Mechanothermochromic Polydiacetylene Sensors

Mechanically Drawable Thermochromic and Mechanothermochromic Polydiacetylene Sensors

Stimulus-active polymer actuators for next-generation microfluidic devices

Properties, Functions, Chemical Transformation, Nano-, and Hybrid Materials of Poly(diphenylacetylene)s toward Sensor and Actuator Applications

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