Reversible Emission Color, Brightness, and Shape Changes of AIEgen‐containing Bulk Polymers

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 24, 2024

Abstract Bulk polymers generally exhibit faster response, higher shape‐deformation speed, and stronger mechanical properties than the hydrogels. However, it still remains a formidable challenge to enable bulk reversible changes in shape fluorescence simultaneously. Herein, for first time, temperature‐responsive color, brightness, of semi‐crystalline poly( ε ‐caprolactone) (PCL) network doped with D‐A based aggregation‐induced emission luminogen (AIEgen) is realized. The fabricated flower‐like dragonfly‐shaped actuators show blooming‐closing wing fanning behaviors, respectively, as well fluorescence‐changing effects. Notably, response speed system much better reported Moreover, smart switch developed demonstrate potential applications. stick by sample can lift release an object 1000 times larger its weight, serving color‐changing artificial muscle. This material design strategy may shine light on preparation other combination stimuli‐responsive luminescence‐changing AIEgens, such mechanochromic, thermochromic, photochromic luminogens.

Language: Английский

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Stretchable Conductive Shape Memory Nanocomposites for Programmable Electronics Via Synergy of Photo-Mediate Conjoined Network and Metamaterial Design

Published: Jan. 1, 2024

Conductive shape memory nanocomposites are very promising in flexible electronics, soft robotics, wearable sensors, etc. However, achieving a balance between conductivity, behavior, and stretchability is still challenging this field. Here we report stretchable conductive (SCSMNCs) prepared through synergy of photo-mediate conjoined network metamaterial design. At molecular level, ulitlize highly efficient radical polymerization hydrogen abstraction reaction to fast construct polymeric one-step (~68 s). Hybrid nanofibers are, meanwhile, introduced generate network. This rational design facilitates the fabrication simultaneously exhibiting excellent high improved mechanical properties, rapid gelation. Mechanics-guided can be then produced by additive manufacturing further increase without compromising other key properties. Consequently, benefitting from SPCNMD strategy, stretching strain SCSMNCs improves significantly 19 times compared samples lacking structural design, with conductivity >105 S/m, fixation ratio recovery >95%. Notably, combination increased stretchability, behavior endows adaptive electrical properties over long ranges. Based on these advanced performances, demonstrate utility designed as function-programmable electromagnetic interference shields sensors. We anticipate study will pave new way for application high-performance SCSMNCs.

Language: Английский

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Infrared light responsive shape memory tracheal stent based on TPU6/PCL4/PANI composites

Journal of Reinforced Plastics and Composites, Journal Year: 2024, Volume and Issue: unknown

Published: June 4, 2024

3D printed tracheal stent based on light-responsive shape memory composites (SMC) has a good application prospect due to its remote, non-contact drive and the ability adapt complex environments. This paper detailed fabrication, characterization, infrared light (IR) actuating effects of SMC thermal polyurethane (TPU)/poly(caprolactone) (PCL)/polyaniline (PANI)/composites. Herein, experiments have explored preparation process parameters printing properties (e.g., filament-molding temperature, speed) premise smooth composites. The thermogravimetric analysis (TGA), Fourier transform spectroscopy (FTIR), differential scanning calorimetry (DSC), micro-morphology, tensile testing was operated characterize TPU6/PCL4/PANI Additionally, performance shown that fixation rate prepared IR-responsive about 99%, recovery ratio approximately 95%. Therefore, this work customized scaffold by technology (FDM), which possesses excellent IR-triggered remote-controlling structure deformation performance. Moreover, collaborating with minimally invasive surgery, IR-actuating structures can expand scope in biomedical field provide new way for personalized implantable medical devices.

Language: Английский

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4D Printing of Electrically Activated Reversible Deformation Composite Actuators

Advanced Materials Technologies, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 23, 2024

Abstract 4D printing of shape memory polymers combines smart materials and 3D technology enabling transformations in shape, properties, functionalities. However, existing research predominantly addresses unidirectional deformation, necessitating the application external force for reprogramming after each deformation. This limitation impedes realization continuous reversible posing challenges to meet demands deformation complex scenarios. study introduces an innovative method fabricating electrically activated composite actuators by printing. The actuator's structure comprises conductive ink PEEK. Upon current excitation, actuator attains controlled attributed electro‐thermal sintering properties ink, combined with effect phase transition performance is validated subjecting varying high‐low excitations, modifying excitation circuit's configuration, refining PEEK process. Concurrently, evaluated through cyclic excitation. Additionally, inchworm‐like crawling robot fabricated demonstrate validation, achieving a speed exceeding 8 mm min −1 . technique developed this expands potential applications fields such as actuators, soft robotics, deployable structures.

Language: Английский

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