- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Cross-linking induced thermoresponsive hydrogel with light emitting and self-healing property
摘要： Development of self-healing hydrogels with thermoresponse is very important for artificial smart materials. In this article, the self-healing hydrogels with reversible thermoresponse were designed through cross-linking-induced thermoresponse (CIT) mechanism. The hydrogels were prepared from ketone group containing copolymer bearing tetraphenyl ethylene (TPE) and cross-linked by naphthalene containing acylhydrazide cross-linker. The mechanical property, light emission, self-healing, and thermo-response of the hydrogels were investigated intensively. With regulation of the copolymer composition, hydrogels showed thermoresponse with the LCST varied from above to below body temperature. At the same time, the hydrogels showed self-healing property based on the reversible characteristic of the acylhydrazone bond. The hydrogel also showed temperature-regulated light emission behavior based on AIE property of the TPE unit.
关键词： TPE,cross-linking-induced thermoresponse,hydrogel,self-healing,light emission
更新于2025-11-14 15:27:09
-
Cross-linking induced thermo-responsive self-healable hydrogels with temperature regulated light emission property
摘要： Self-healing hydrogels draw great attentions in past decade based on the self-healing property similar to living creatures and their potential application in bioscience. On the other hand, thermo-response of the hydrogel endow the hydrogel with smart characteristic for controlled drug loading and delivery, diagnosis, cell imaging, life simulation, etc. In this study, self-healable hydrogel with cross-linking induced thermo-response (CIT) property was prepared from TPE containing copolymer TPE-P(DMA-stat-DAA) and the LCST of the hydrogels could be regulated by copolymer composition and the structure of the cross-linkers. The light emission property, mechanical and self-healing performances of the hydrogels are also investigated intensively. The results showed the LCST of the hydrogels could be regulated to body temperature through cross-linking induced thermo-response (CIT) mechanism with PEO23 DNH cross-linking. At the same time, the hydrogels exhibit light emission property, excellent self-healing ability and good mechanical properties. Moreover, the hydrogels showed different light emission property regulated by temperature based on AIE property of the TPE.
关键词： Light emission,Self-healing hydrogel,Cross-linking induced thermo-response
更新于2025-11-14 15:26:12
-
Reversible Self-Healing for Preserving Optical Transparency and Repairing Mechanical Damage in Composites
摘要： This research concentrates on the healing of optical properties, roughness, contact angle hysteresis, and shallow scratches in polymer/nanoparticle composites. A series of ternary composite blends [epoxy/halloysite nanotubes (HNTs)/cellulose acetate butyrate (CAB)] with various CAB concentrations were fabricated and subjected to a series of mechanical damages. The optimized concentration of nanoparticle is 1.0 vol% and for CAB concentration of 3.0 vol% based on the mechanical reinforcement and wear-resistance. Nanoscale scratching, micro-level falling-sand test, and macro-level Taber Abrasions were utilized to damage the surfaces. The induced damage (roughness and surface scratch up to hundreds of nanometers in depth) healed upon heating. At any temperatures above the softening transition of the semi-interpenetrating network structure of the polymer composites, CAB migrates into the micro-cracks, and the essential mechanical parameters (modulus, strength, strain-to-failure) are recovered; in our particular epoxy/HNTs/CAB system, optical transparency is also recovered efficiently. CAB also moves to the macroscopic air/specimen interface and favorably modifies the surface properties, reducing the roll-off angles of water droplets from ~90o to ~20o. Through an appropriate choice of CAB additives with different molecular weight, the healing temperature can be tailored.
关键词： mechanical,multi-functional,transparent,composites,self-healing
更新于2025-10-22 19:40:53
-
Fluorescent Self-Healing Carbon Dot/Polymer Gels
摘要： Multicolor, fluorescent self-healing gels were constructed through reacting carbon dots produced from different aldehyde precursors with branched polyethylenimine. The self-healing gels were formed through Schiff base reaction between the aldehyde units displayed upon the carbon dots' surface and primary amine residues within the polyethylenimine network, generating imine bonds. The dynamic covalent imine bonds between the carbon dots and polymeric matrix endowed the gels with both excellent self-healing properties, as well as high mechanical strength. Moreover, the viscoelastic properties of the gels could be intimately modulated by controlling the ratio between the carbon dots and polymer. The distinct fluorescence emissions of the gels, originating from the specific carbon dot constituents, were employed for fabrication of light emitters at different colors, particularly generating white light.
关键词： imines,carbon dots,aldehydes.,dynamic covalent bonds,self-healing gels,fluorescent gels
更新于2025-09-23 15:23:52
-
Simple Synthesis of Elastomeric Photomechanical Switches That Self-Heal
摘要： This article introduces a simple two-stage method to synthesize and program a photomechanical elastomer (PME) for light-driven artificial muscle-like actuations in soft robotics. First, photochromic azobenzene molecules are covalently attached to a polyurethane backbone via a two-part step-growth polymerization. Next, mechanical alignment is applied to induce anisotropic deformations in the PME-actuating films. Cross-linked through dynamic hydrogen bonds, the PMEs also possess autonomic self-healing properties without external energy input. This self-healing allows for a single alignment step of the PME film and subsequent “cut and paste” assembly for multi-axis actuation of a self-folded soft-robotic gripper from a single degree of freedom optical input.
关键词： stimuli-responsive,self-healing elastomers,soft robotics,photomechanical effects,actuators
更新于2025-09-23 15:23:52
-
Light emitting self-healable hydrogel with bio-degradability prepared form pectin and Tetraphenylethylene bearing polymer
摘要： Self-healable hydrogel have wide applications in bioscience. In this research, self-healable hydrogel were prepared from TPE-[P(DMA-stat-DAA)]2 and acylhydrazide functionalized pectin. The TPE containing polymer endowed the hydrogel with light emission property while the pectin make the hydrogel biodegradable. Results showed that the pectin acylhydrazide can be prepared conveniently from pectin through hydrazinolysis. Light emissive hydrogels formed and self-healed without additional stimulus. More importantly, the hydrogel become light emitting with PL intensity higher than the polymer solution. The reason for this result is because the TPE units aggregated in the hydrophobic pectin ring and triggered AIE property. With biodegradable pectin, the hydrogel could be degraded naturally without worrying about the toxicity of the hydrogel in future bio-applications.
关键词： Self-healing,Hydrogel,TPE,Pectin,Light emission
更新于2025-09-23 15:23:52
-
Construction of Self-Healing Internal Electric Field for Sustainably Enhanced Photocatalysis
摘要： The construction of internal electric field is generally considered an effective strategy to enhance photocatalytic performance due to its significant role in charge separation. However, static internal electric field is prone to be saturated either by inner or outer shield effect, and thus its effect on the improvement of photocatalysis can easily vanish. Here, the self-healing internal electric field is proposed and successfully endowed to a designed helical structural composite microfiber polyvinylidene fluoride/g-C3N4 (PVDF/g-C3N4) based on the bioinspired simple harmonic vibration. Importantly, the saturation and recovery of internal electric field are characterized by transient photovoltage and photoluminescence. The results indicate that the internal electric field could be saturated within about 10 min and refreshed with the assistance of rebuilt piezoelectric potential. The lifetime of photogenerated carriers is about 10?4 s and the number of effective carriers is greatly increased in the presence of self-healing internal electric field. The results provide direct experimental evidence on the role of self-healing internal electric field in charge transfer behavior. This work represents a new design strategy of photocatalysts, and it may open up new horizons for solving energy shortage and environmental issues.
关键词： charge separation,photocatalysis,microfluidics,bioinspired,self-healing
更新于2025-09-23 15:23:52
-
Photothermal-Induced Self-Healable and Reconfigurable Shape Memory Bio-Based Elastomer with Recyclable Ability
摘要： Photothermal-induced self-healable and shape memory materials have drawn much attention due to the rapidly growing technical applications and environmental requirements. As epoxy natural rubber (ENR) is a kind of bio-based elastomer with good mechanical properties, weather resistance, and air impermeability, it is of great significance to incorporate ENR with recyclable, photothermal-induced self-healable and shape memory properties. In this study, we report a simple method to cross-link ENR with dodecanedioic acids (DAs) through esterification reaction, and during the cross-linking process, a little aniline trimer (ACAT, a kind of oligoaniline) was added at the same time. Then, the ENR-DA-ACAT vitrimers that were covalently cross-linked with recyclable, self-healable, and multiple responsive properties were obtained, which also possessed various functions. As a result of the transesterification reactions at elevated temperatures, the ENR-based vitrimers possess the ability to be reprocessed and self-healed, and the mechanical properties could be maintained even after three consecutive breaking/mold pressing cycles. Besides, the vitrimer is also responsive to near-infrared (NIR) light and pH with the introduction of ACAT, and we also find that ACAT can be used as a catalyst to accelerate the transesterification reaction. Moreover, it is demonstrated that the ENR-DA-ACAT vitrimer could also be used to construct the reconfigurable shape memory polymer; the shape fixing ratio and shape recovery ratio are both above 95% in the reconfiguration process, and the multistage shape memory performance can also be achieved by NIR irradiation, which will potentially lead to a wide application for ENR in the field of actuators.
关键词： self-healing,reconfigurable shape memory,photothermal effect,recyclable,transesterification reaction,ENR
更新于2025-09-23 15:23:52
-
An electrochromic and self-healing multi-functional supercapacitor based on PANI/nw-WO2.7/Au NPs electrode and hydrogel electrolyte
摘要： Supercapacitors with various functions have been attracting continuous interest due to their key role in modern electronics. In addition to flexibility and transparency, researches also focus on the electrochromism of supercapacitors, which can be used to indicate the remaining capacity of the devices. The self-healing supercapacitors can also recover their energy-storage performances automatically after mechanical damage, thus exhibiting excellent reliability and maintenance. Herein, we report a facile strategy to fabricate a flexible supercapacitor with both electrochromic and self-healing properties. In this design, the classical color-changing materials: polyaniline (PANI) and tungsten oxide nanowires (WO2.7 NWs) are used together to enlarge the electrochemical window, and give the electrode material electrochromic properties. And then Au nanoparticles (Au NPs) are sprayed onto the surface to further increase the electrochemical conductivity. Besides, a novel self-healing hydrogel is synthesized to be used as solid electrolyte. Finally, a symmetrical supercapacitor device is assembled, which shows the areal capacitance of 61 mF/cm2 with excellent stability. By this design, we firstly fabricate a supercapacitor with many functionalities, such as, flexibility, transparence, color changing and self-healing properties all together, providing a new integration strategy for satisfying the next-generation electronics.
关键词： areal capacitance,Supercapacitor,self-healing,flexible,electrochromic
更新于2025-09-23 15:22:29
-
Surface-Initiated Metal-Free Photoinduced ATRP of 4-Vinylpyridine from SiO2 via Visible Light Photocatalyst for Self-healing Hydrogels
摘要： Robust and self-healable nanocomposite hydrogels was realized by the encapsulation of components of photoinduced electron transfer-atom transfer radical polymerization (PET-ATRP) into the surface-modified silica nanoparticles (SiO2). The prepared SiO2@P4VP was in the form of self-healing nanocomposite hydrogels, where 4-Vinylpyridine (4VP) was polymerized through PET-ATRP with organic photocatalyst Rhodamine B. The modified nanoparticles were characterized by X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR). The nanocomposite hydrogels can be healed rapidly and autonomously without any stimulation at ambient temperature. Specifically, the nanocomposite hydrogels has a tensile strength of about 2.90 MPa, which recovered to 77.0% after 12 hours, and an elongation at break of about 730 %. These self-healing hydrogels with cheap raw material, possess better strength and self-healing performance, will have broad prospects.
关键词： Self-Healing Hydrogels,Visible Light,Metal-Free Photoinduced ATRP,Nanocomposite Hydrogels
更新于2025-09-23 15:21:21