Excellent Elasticity Research Articles

Euryale ferox stem-inspired anisotropic quaternized cellulose/xanthan-based antibacterial sponge with high absorbency and compressibility for noncompressible hemorrhage

Uncontrollable hemorrhage from deep noncompressible wounds remains an intractable challenge. Herein, inspired by the euryale ferox stem which is capable of transporting water and nutrient substances efficiently along longitudinally aligned channels, an anisotropic sponge with rapidly liquid absorption capacity, excellent mechanical compressibility and antibacterial property based on quaternized cellulose (QC), xanthan gum (XG) and reduced graphene oxide (rGO), was constructed. The euryale ferox stem-like structure and multiple interactions, involving hydrogen bonding, electrostatic interaction and chemical crosslinking, endowed the sponge with excellent fatigue resistance, elasticity and efficient liquid absorption capacity. In vivo rat liver injury, tail amputation and liver noncompressible hemorrhage model experiments confirmed that the sponge exhibited superior hemostatic performance than commercial gelatin sponge, attributing to the positive charge, efficient absorption capacity and rough surface of the sponge, which synergistically promoting the aggregation and activation of red blood cells and platelets as well as formation of fibrin network, leading to accelerated blood coagulation process. Besides, the sponge showed favorable cytocompatibility, hemocompatibility and antibacterial property. Overall, the bioinspired sponge had fantastic potential for controlling deep noncompressible hemorrhage and providing a new idea for designing hemostatic materials.

Hierarchically interlocked helical conductive yarn enables ultra-stretchable electronics and smart fabrics

Simultaneously achieving high mechanical elasticity and electrical conductivity is essentially required for wearable electronics and smart fabrics. However, great challenges still remain to achieve high electrical conductance under large mechanical deformations due to the “trade-off” effect between them. Herein, inspired by curling structure of climbing plants, hierarchically interlocked helical conductive yarn for ultra-stretchable electronics and smart fabrics was developed, via over-twisting silver nanowires (AgNWs)/MXene multi-dimensional synergistic conductive networks that hierarchically entangled with elastic thermoplastic polyurethanes (TPU) nanofiber networks. High-aspect-ratio 1D AgNWs bridged 2D MXene nanosheets into synergistic interconnected conductive network while interlocked with elastic 3D TPU nanofiber skeleton. Unique hierarchically interlocking effect between highly conductive networks and highly elastic nanofiber networks during the twisting process induced helical conductive yarn simultaneously exhibits excellent mechanical stretchability and electrical conductivity. Excellent intrinsic elasticity of TPU macromolecular chains coupled with its hierarchically helical structure enables the conductive yarn exhibits excellent mechanical stretchability. While the hierarchically interlocked conductive structure ensures the stretchable yarn possess high electrical conductivity which could resist large mechanical deformations during stretching process. The hierarchically interlocked helical conductive yarn could still exhibit high electrical conductivity (1.12 × 105 S/m) even under large mechanical deformations (300%), which effectively avoid the “trade-off” effect. Moreover, the ultra-stretchable conductive yarn exhibits smart responsiveness to multi stimuli (mechanical/electron/light). The helical strain sensor has excellent electromechanical performance with stable GF (1.7) in the 600%–1000% linear range. The hierarchically interlocked helical conductive yarn holds great promise for ultra-stretchable electronics and smart fabrics.

Excellent high temperature elasticity and thermodynamic properties of W-Cr alloys: A first-principles study

The mechanical and thermodynamic properties of W-Cr alloys (including W15Cr1, W14Cr2, W12Cr4 and W8Cr8 alloys) are investigated by the first-principles study. Meanwhile, the investigation of pure W is also carried out to verify the reliability of the calculation in this paper. The results show that W-Cr alloys are thermodynamically stable and possess the characteristics of advanced materials. The bulk modulus of W-Cr alloys shows the essence of high elasticity at high temperature, which may be a major discovery. The W-Cr alloys belong to medium expansion materials and the thermal expansion coefficients of W12Cr4 and W8Cr8 alloys are significantly lower than that of pure W and other alloys, indicating that the addition of Cr can inhibit the thermal expansion behavior of pure W at high temperature. The thermal conductivity of W-Cr alloys is more obviously higher than that of pure W at high temperature, indicating that doping of Cr can improve the thermal conductivity of pure W. At 0 K, the ductility of W15Cr1 and W14Cr2 alloys is lower than that of pure W, while the ductility of W12Cr4 and W8Cr8 alloys is better than that of pure W, which indicates that the ductility of pure W can be improved by adding higher concentration of Cr. By investigating the mechanical and thermodynamic properties of W-Cr alloys, the theoretical reference is provided for its application in the field of nuclear fusion.

Highly efficient construction of sustainable bacterial cellulose aerogels with boosting PM filter efficiency by tuning functional group

Air pollution has become a major public health concern, attracting considerable attention from researchers working on environmentally friendly and sustainable materials. In this work, bacterial cellulose (BC) derived aerogels were fabricated by the directional ice-templated method and used as filters to remove PM particles. We modified the surface functional groups of BC aerogel with reactive silane precursors, and investigated the interfacial and structural properties of those aerogels. The results show that BC-derived aerogels have excellent compressive elasticity, and their directional growth orientation inside the structure significantly reduced pressure drop. Moreover, the BC-derived filters exhibit an exceptional quantitative removal effect on fine particulate matter, which, in the presence of high concentrations of fine particulate matter, they can achieve a high-efficiency removal standard of 95 %. Meanwhile, the BC-derived aerogels showed superior biodegradation performance in the soil burial test. These results paved the way for BC-derived aerogels development as a great sustainable alternative to treat air pollution.

Flexible Optical Waveguides in Heterocyclic Schiff Base Self-Assembled Hydrogen-Bonded Solvates

Flexible fluorescent crystalline materials exhibit both mechanical and optical properties and have received great attention due to their potential applications in flexible optical devices. Simultaneously adjusting the mechanical and optical properties of crystalline materials remains interesting and challenging. In the present work, a guest molecule was introduced via hydrogen-bonded solvation, which achieved excellent mechanical elasticity and higher fluorescence emission than that of the host heterocyclic Schiff base molecule crystal itself. The crystal structure–property relationship and the molecular mechanism of the elasticity were then investigated in detail. It revealed that solvent molecules play a key role in changing both the stacking of fluorescent molecules and the interaction energy framework. In addition, the flexible fluorescent solvate exhibits a good waveguide property. A bent crystal was found to have a larger optical loss coefficient than a straight crystal. Furthermore, the size effect on the optical loss coefficient of the waveguide was discussed in which the optical loss coefficient decreases as the sizes increase. Such a size effect is usually neglected in waveguide material research and should be complemented in the performance evaluation of optical waveguides.

Starch-Based Ion-Conductive Organo-Hydrogels with Self-Healing, Anti-Freezing, and High Mechanical Properties toward Strain Sensors.

Fully bio-based ion-conductive organo-hydrogels with multi-functionalities such as high mechanical properties, self-healing, anti-freezing, and non-drying capabilities are still extremely rare so far, and achieving it remains a great challenge. In this work, a starch/natural rubber composite hydrogel is first obtained by a simple one-pot method, and then an ion-conductive organo-hydrogel composed of starch, natural rubber, lithium chloride, and glycerol with adjustable mechanical properties (ultimate tensile stress of 0.15-2.33MPa with a failure strain of 675-1367%, elastic modulus of 0.087-15.2MPa) is fabricated by a solvent replacement strategy. The organo-hydrogels exhibit excellent fatigue resistance, elasticity, and good self-healing, anti-freezing, non-drying properties (with no obvious change after 10days at ambient environment). The obtained hydrogels are successfully applied to monitor human movement with high durability (over 1000 cycles) and low hysteresis. In addition, the sensors exhibit high stability in a wide temperature range from -20°C to 100°C that endows it with a wide range of potential applications in flexible sensing and wearable devices.

Synthesizing Polyurethane Using Isosorbide in Primary Alcohol Form, and Its Biocompatibility Properties.

Isosorbide is a bio-based renewable resource that has been utilized as a stiffness component in the synthesis of novel polymers. Modified isosorbide-based bis(2-hydroxyethyl)isosorbide (BHIS) has favorable structural features, such as fused bicyclic rings and a primary hydroxyl function with improved reactivity to polymerization when compared to isosorbide itself. Polyurethane series (PBH PU series) using polycarbonate diol (PCD) and bis(2-hydroxyethyl)isosorbide (BHIS) were polymerized through a simple, one-shot polymerization without a catalyst using various ratios of BHIS, PCD, and hexamethylene diisocyanate (HDI). The synthesized BHIS and PUs were characterized using proton nuclear magnetic resonance (1H-NMR), Fourier transform infrared (FT-IR), differential scanning calorimetry (DSC), and mechanical testing. To determine the feasibility of using these PUs as biomedical materials, we investigated the effects of their BHIS content on PBH PU series physical and mechanical properties. The PBH PU series has excellent elasticity, with a breaking strain ranging from 686.55 to 984.69% at a 33.26 to 63.87 MPa tensile stress. The material showed superb biocompatibility with its high adhesion and proliferation in the bone marrow cells. Given their outstanding mechanical properties and biocompatibility, the polymerized bio-based PUs can contribute toward various applications in the medical field.

Non-affine dissipation in polymer fracture

Viscoelasticity is a universal property in most soft solids. Specifically, for the fracture of polymeric materials, viscoelasticity has often been regarded as a major mechanism of toughening, and the excess fracture energy beyond the intrinsic value correlated to the stress–strain hysteresis, which is commonly used to characterize viscoelasticity in the framework of continuum mechanics. Through systematically planned experiments, the current study shows that a noticeable package of energy dissipation exists besides that associated with the hysteretic deformation. This package of energy is attributed to the highly non-affine deformation near the crack tip — the rearrangement and mutual sliding of the neighboring chains caused by the rupture of a polymer chain, which are insignificant in samples under homogeneous deformation. Various means of inter-chain-friction reduction, e.g., by applying lateral stretches, diluting the chains with solvent, or subject the material to dynamic or static fatigue, can mitigate the effect of non-affine dissipation, and bring the fracture energy down to the intrinsic threshold. In contrast, by making an elastomer more elastic, e.g., by training through cyclic loading, the non-affine dissipation remains effective, and the limiting fracture energy is significantly higher than the threshold even when the hysteresis is negligible. The identification of the non-affine-dissipation mechanism paves the way to the development of new soft materials with both excellent elasticity and significant fracture toughness.

Novel self-healing and recyclable fire-retardant polyvinyl alcohol/borax hydrogel coatings for the fire safety of rigid polyurethane foam.

Rigid polyurethane foam (RPUF) has attracted great attention as an insulation material, but its inherent flammability restricts its practical application. Developing a sustainable fire-retardant strategy that can improve its fire safety is particularly desirable and challenging. Herein, novel fire-retardant hydrogel coatings based on polyvinyl alcohol (PVA) and borax are proposed and applied in RPUF, and the self-healing, recyclability and flame retardant properties of the coatings are investigated. The dynamic and reversible cross-linked networks based on the borate ester bonds and hydrogen bonds endow the hydrogels with excellent repairability, recyclability, and elasticity. Compared with a neat RUPF, the coated RPUF exhibited improved fire-retardant properties without the inherent advantages being influenced and can be reflected by the 8% increase in the limiting oxygen index (LOI), 20% reduction in total heat release (THR), and 25% decrease in total smoke production (TSP) with the coatings, along with a rapid self-quenching behavior. The novel hydrogel coatings provide a new strategy for the development of flame-retardant coatings, demonstrating the potential of the next generation of self-healing hydrogel coatings to reduce the fire risk of the RPUF.

Development Of Edible Starch-Based Paper

The study is aimed to develop an edible film from maize and rice flour. The film is prepared using corn starch, CMC, MC, LG, and glycerol in various combinations. The 15% glycerol showed excellent binding and elasticity qualities. Broken rice flour inclusion resulted in a significant reduction in fractures and stickiness. The edible paper made from starch (3%), rice flour (22%), sodium carboxymethyl cellulose (0.5%), microcrystalline cellulose (0.5%), glycerol (20%), liquid glucose (5%), and xanthan gum (1%) had good physical and structural qualities. The thickness of the formed paper was 138 ±2 µm, with a solubility of 89-92 percent. Edible paper is slightly diverse in character, according to SEM data. The edible paper is amorphous in nature, according to the X-ray diffraction analysis.

Characterizing polyproline II conformational change of collagen superhelix unit on adsorption on gold surface.

The dynamic process of protein binding onto a metal surface is a frequent occurrence as gold nanoparticles are increasingly being used in biomedical applications, including wound treatment and drug transport. Collagen, as a major component of the extracellular matrix, has potentially advantageous biomedical applications, due to its excellent biocompatibility and elasticity properties. Therefore, a mechanistic comprehension of how and which species in collagen interact with gold nanoparticles is a prerequisite for collagen-gold complexes in clinical application. However, the dynamic behavior of collagen with the polyproline II (PPII) conformation on gold sheets at the molecular level is too complex to capture under current experimental conditions. Here, using molecular dynamics simulations, we investigate the adsorption process and conformational behavior of the tripeptide Gly-Pro-Hyp with the repetitive unit of the collagen superhelix on the gold surface as a function of number of repeating units from 1 to 10. The different numbers of repeating units all prefer to approach the gold surface and adsorb via charged residues at the C-terminal or N-terminal ends, tending to form arch structures on the gold surface. Compared with the various tripeptide units in solution still retaining the native PPII conformation, the presence of the gold surface affects the formation of hydrogen bonds between the protein and water molecules, thus disrupting the PPII conformation of collagen. Specifically, the interaction between the gold surface and HYP limits the rotation of the dihedral angle of collagen, resulting in a tendency for the PPII conformation of the gold surface to transform to the β-sheet conformation. The results provide an indication of how to improve the interaction between the terminal groups and the gold surface for the design of a bioavailable protein-gold material for medicinal purposes.

Elastic and compressible Al2O3/ZrO2/La2O3 nanofibrous membranes for firefighting protective clothing

Developing ceramic nanofibrous membranes for the thermal insulation layer of firefighting protective clothing is vital. However, previous ceramic nanofibrous membranes were brittle and easy to break during service in high-temperature environments. The lack of elastic and compressible properties has limited the high-end applications of ceramic nanofibrous membranes. In this work, elastic and compressible Al2O3/ZrO2/La2O3 nanofibrous membranes were fabricated via sol–gel electrospinning and calcination in air at different temperatures. The as-fabricated Al2O3/ZrO2/La2O3 nanofibrous membranes can maintain excellent elasticity and compressibility in the temperature ranging from −196 to 1400 °C. Moreover, they have low thermal conductivity and high working temperatures. These favorable characteristics make the Al2O3/ZrO2/La2O3 nanofibrous membranes a promising candidate for the thermal insulation layer of firefighting protective clothing.

Boronic ester-based vitrimeric methylvinyl silicone elastomer with “solid-liquid” feature and rate-dependent mechanical performance

Vitrimer chemistry can integrate reprocessability, recyclability, self-healing and good creep-resistance into polymers through covalent adaptive network structure. In particular, reactive processing shows great potential to convert commercial polymers into vitrimers in industrial scale. In this work, vitrimeric silicone elastomer was successfully prepared in a one-step peroxide-induced thiol-ene click reaction between thiol-terminated boronic ester and vinyl groups of commercial methylvinyl silicone rubber (MVQ) via reactive processing. It was found that MVQ vitrimer elastomer shows good reprocessability, self-healing property, excellent elasticity and a similar gel content to that of traditional peroxide-crosslinked MVQ rubbers. Based on classical Arrhenius theory, the calculated activation energy (Ea) of B–O dynamic bond in MVQ vitrimer is 28.5 kJ/mol along with a topology-freezing transition temperature (Tv) of 6.4 °C. Intriguingly, the fabricated MVQ vitrimer shows a strongly rate-dependent mechanical response, i.e., larger mechanical strength at higher deformation rate, which is mainly due to fast bond-exchange rate of the B–O bonds even at room temperature. MVQ vitrimer shows a “solid-liquid” feature, that is, exhibiting liquid-like behavior at longer obeservation time or when stretched at low strain rate while acting as solid elastomer at high strain rate. Notably, the tensile toughness (@500% strain) can obtain nearly 1.6-fold increase to 47.59 MJ/m3 from 18.58 MJ/m3 when increasing tensile speed, indicating an excellent energy-dissipative behavior especially at high deformation rate. Therefore, our work can provide guidance for molecular design and reactive processing of high-performance vitrimeric silicone elastomers toward industrial applications.

Bioadhesive eutectogels supporting drug nanocrystals for long-acting delivery to mucosal tissues.

Eutectogels (Egels) are an emerging class of soft ionic materials outperforming traditional temperature-intolerant hydrogels and costly ionogels. Due to their excellent elasticity, non-volatile nature, and adhesion properties, Egels are attracting a great deal of interest in the biomedical space. Herein, we report the first example of adhesive Egels loading drug nanocrystals (Egel-NCs) for controlled delivery to mucosal tissues. These soft materials were prepared using gelatin, glycerine, a deep eutectic solvent (DES) based on choline hydrochloride and glycerol, and nanocrystallised curcumin, a model drug with potent antimicrobial and anti-inflammatory activities. We first explored the impact of the biopolymer concentration on the viscoelastic and mechanical properties of the networks. Thanks to the dynamic interactions between gelatin and the DES, the Egel showed excellent stretchability and elasticity (up to ≈160%), reversible gel-sol phase transition at mild temperature (≈50​°C), 3D-printing ability, and good adhesion to mucin protein (stickiness ≈40​kPa). In vitro release profiles demonstrated the ability of the NCs-based Egel to deliver curcumin for up to four weeks and deposit significantly higher drug amounts in excised porcine mucosa compared to the control cohort. All in all, this study opens new prospects in designing soft adhesive materials for long-acting drug delivery and paves the way to explore novel eutectic systems with multiple therapeutic applications.

A Reusable Pseudo-Liquid-to-Solid Inertial Switch Based on Hetero-Coated Galinstan Droplets

Compared to solid-to-solid inertial switches, the devices based on liquid-to-solid contact can avoid the signal bouncing and contact wear caused by the rigid contact between the proof mass and the stationary electrode. However, most of the current liquid-to-solid inertial switches can only support one-time use. To resolve this issue, we, for the first time, present a pseudo-liquid-to-solid inertial switch that not only has a soft electronic contact but also is reusable. We utilize one graphene-coated galinstan droplet (GGD) with high conductivity as the proof mass and two polytetrafluoroethylene (PTFE)-coated galinstan droplets (PGDs) with excellent elasticity and mechanical robustness as springs to restrain the GGD. Moreover, the coated powder shell can prevent galinstan droplets from being oxidized thus enables superior performance in terms of nonstick property and high mobility. As a result, a pseudo-liquid-to-solid inertial switch with a threshold of 20 g is designed and fabricated, and it exhibits high reliability, reusability and stability with a contact time of 1 ms. In summary, this novel type of inertial switch combines the advantages and overcomes the limitations of both liquid-to-solid type and solid-to-solid type, therefore is of great potential for practical applications. [2022-0151]

Self-healing and elastic polymer gel via terpyridine-metal coordination

A supramolecular polymer is prepared by tristerpyridine ligand and metal ion Zinc coordination. When the supramolecular polymer is dissolved in acetonitrile, a metallo-gel can be obtained at a very low monomer concentration (< 1.0 wt%). Remarkably, this metallo-gel exhibits rapid self-healing ability and excellent elasticity with high recovery. • Coordination gelation was observed at very low monomer concentrations, indicating gel- A /Zn 2+ was a highly potential supergelator. • The supramolecular gel exhibited a great macroscopic self-healing ability. • A good elastic behavior was observed from gel- A /Zn 2+ . Self-healing and elasticity are assiduously pursued qualities for substrate materials which are applicable in many fields such as wearable electronic devices, touch screens, and soft robotics. Up to now, the most reported self-healing and elastic gel materials were constructed by supramolecular polymers with covalent backbones. Herein, a supramolecular gel- A /Zn 2+ was built based on supramolecular polymerization through terpyridine-Zn 2+ coordination. Importantly, this metallo-gel exhibits the self-healing ability. In addition, a freshly prepared metallo-gel ball with a diameter of 1.0 cm could rebound back with 89.6% recovery from free-drop which displayed excellent elasticity. Superb features of gel- A /Zn 2+ including self-healing ability, elasticity and hydrophilia provide prospects for high-performance adaptive materials.

Graphene meta-aerogels: When sculpture aesthetic meets 1D/2D composite materials

The engraving technique has grown in parallel with our human civilization, along with the targeted materials evolving from stone and metals to wood. Benefiting from the blossom of nanotechnology, the bulky nicking tools have downsized themselves to a micro-/nanoscale, such as laser beams, and the materials have been extended from traditional hard ones to soft functional nanomaterials. When ancient sculpture art meets modern advanced micro-/nano fabrication techniques and low-dimensional materials, impossible materials are born, which will redefine the functional scope of well-developed materials. Recently, a team from Tsinghua University reported such fascinating materials, graphene-based meta-aerogels, that process excellent elasticity, ultralight specific weight (down to 0.1 mg·cm⁻³), and superwide Poisson's ratio range (−0.95 &lt; <i>v</i>_peak &lt; 1.64) via facile and fast laser-engraving technique.

Mechanically Robust and Flexible GO/PI Hybrid Aerogels as Highly Efficient Oil Absorbents.

Herein, mechanically robust and flexible graphene oxide/polyimide (GO/PI) hybrid aerogels (GIAs) were fabricated by a facile method, in which the mixed suspensions of the water-soluble polyimide precursor and graphene oxide (GO) sheets were freeze-dried, which was followed by a routine thermal imidation process. The porous GIAs obtained not only exhibit excellent elasticity and extremely low density values (from 33.3 to 38.9 mg.cm-3), but they also possess a superior compressive strength (121.7 KPa). The GIAs could support a weight of up to 31,250 times of its own weight, and such a weight-carrying capacity is much higher than that of other typical carbon-based aerogels. Having such a porous structure, and high strength and toughness properties make GIAs ideal candidates for oil spill cleanup materials. The oil/organic solvents' absorption capacity ranges from 14.6 to 85, which is higher than that of most other aerogels (sponges). With their broad temperature tolerance and acidic stability, the unique multifunctional GIAs are expected to further extend their application range into extreme environments.

Stretchable, adhesive and antibacterial mussel-inspired cellulose nanocrystal/pectin biomass-based multifunctional tough hydrogels

The multifunctional biocompatible hydrogels have attracted widespread attention in biomedical applications such as the fields of biomimetic tissues, wound dressings and biosensors. But it is a great challenge to facilely develop a hydrogel with favorable mechanical strength, adhesion performance, anti-swelling behavior, antibacterial activity and biocompatibility at the same time. Inspired by the mechanical reinforcement mechanism of double network and nanocomposite hydrogels as well as the adhesion mechanism of mussel, tannic acid-coated cellulose nanocrystals ([email protected])/pectin/polyacrylic acid nanocomposite hydrogels (TPP hydrogels) are reported in this work. The obtained TPP hydrogels exhibited high stretchability with the fracture strain of more than 1400%, and excellent elasticity and fatigue resistance. Additionally, the abundant catechol groups on [email protected] nanoparticles endow TPP hydrogels with good adhesiveness and can adhere to various hydrophilic and hydrophobic substrates such as wood, glass, polytetrafluoroethylene and biological tissues. Moreover, TPP hydrogels also exhibited the significant anti-swelling properties expressed that the equilibrium swelling ratio of the tested TPP hydrogel was only 19.25% as much as that of the polyacrylic acid hydrogel. In addition, TPP hydrogels displayed favorable antibacterial properties against Escherichia coli and Staphylococcus aureus, and can effectively support the adhesion, growth and proliferation of mouse fibroblasts for showing cytocompatibility. All the results imply that TPP hydrogels have promising potential in biomedical application.

Thermal and infrared light self-repairing, high sensitivity, and large strain sensing range shape memory MXene/CNTs/EVA composites fiber strain sensor for human motion monitoring

Wearable electronic gadgets have always been in great demand for multifunctional flexible strain sensors. However, developing a flexible strain sensor with excellent characteristics such as high sensitivity, wide sensing range, and excellent durability continues to be a significant challenge. On the one hand, the two-performance metrics of high sensitivity and wide sensing range are mutually exclusive, because the former requires significant structural changes under small strains, whereas the latter necessitates the preservation of morphological integrity under large deformations. On the other hand, the usage of flexible strain sensors is invariably accompanied by the destruction of the conductive network, rendering the device unusable for an extended period of time. Here, based on the unique strain related microcrack structure of the Ti 3 C 2 T x (MXene)/carbon nanotubes (CNTs) synergistic interaction and the shape memory property of ethylene vinyl acetate polymer (EVA), a MXene/CNTs/EVA fiber strain sensor was innovatively designed and prepared by swelling ultrasonic method. The results showed that the sensor combines a large strain sensing range (190%), high sensitivity (82.5), ultra-fast response speed (178.9 ms), and excellent durability and stability (> 10,000 cycles). What is even more exciting is that if the strain sensor is failure, it can be repaired by heating for 2 min or infrared irradiation for 5.4 s, and the mechanical and electrical properties of the repaired sensor can be restored to 92% and 94% of the original. In addition, this strain sensor can accurately monitor subtle and large movements of the human body (including elbow and finger bending, speaking, and mouth opening/closing), even if the damaged MXene/CNTs/EVA fiber strain sensor has been repaired. The self-repairing MXene/CNTs/EVA composites fiber-based shape memory matrix has excellent potential as a wearable strain sensor. • The MXene/CNTs/EVA fiber strain sensors exhibit excellent elasticity, and electrical conductivity. • The fiber strain sensors have wide strain sensing range, high sensitivity, and high stability. • The fiber strain sensors can be repaired by heating and infrared light irradiation. • The fiber strain sensors can detect a wide range of human motion and weak physiological signals.