Conducting polymer hydrogels are widely used as strain sensors in light of their distinct skin‐like softness, strain sensitivity, and environmental adaptiveness in the fields of wearable devices, soft robots, and human‐machine interface. However, the mechanical and electrical properties of existing conducting polymer hydrogels, especially fatigue‐resistance and sensing robustness during long‐term application, are unsatisfactory, which severely hamper their practical utilities. Herein, a strategy to fabricate conducting polymer hydrogels with anisotropic structures and mechanics is presented through a combined freeze‐casting and salting‐out process. The as‐fabricated conducting polymer hydrogels exhibit high fatigue threshold (>300 J m−2), low Young's modulus (≈100 kPa), as well as long‐term strain sensing robustness (over 10 000 cycles). Such superior performance enables their application as strain sensors to monitor the real‐time movement of underwater robotics. The design and fabrication strategy for conducting polymer hydrogels reported in this study may open up an enticing avenue for functional soft materials in soft electronics and robotics.

Fatigue‐Resistant Conducting Polymer Hydrogels as Strain Sensor for Underwater Robotics

Transparent wood-based functional materials via a top-down approach

Abstract Conductive hydrogels have recently attracted extensive attention in the field of smart wearable electronics. Despite the current versatility of conductive hydrogels, the balance between mechanical properties (tensile properties, strength, and toughness) and electrical properties (electrical conductivity, sensitivity, and stability) still faces great challenges. Herein, a simplified method for constructing hydrophobic association hydrogels with excellent mechanical and electrical properties is proposed. The prepared conductive hydrogels exhibit high tensile properties (≈1224%), high linearity in the whole‐strain–range ( R 2 = 0.999), and a wide strain sensing range (2700%). The conductive hydrogel can realize more than 1000 cycles of sensing under 500% tensile strain. As an application demonstration, an underwater communication device is assembled in combination with polydimethylsiloxane/Triton X‐100 film coating, which successfully transmits underwater signals and provides warning of potential hazards. This study provides a new research method for developing underwater equipment with excellent mechanical properties and sensing properties. 

Flexible MXene‐Based Hydrogel Enables Wearable Human–Computer Interaction for Intelligent Underwater Communication and Sensing Rescue

Crystallographic orientation evolution during the development of tri-modal microstructure in the hot working of TA15 titanium alloy

A better combination of strength and plasticity may be imparted by the tri-modal microstructure in titanium alloys than the as-built acicular martensite. It is generally conceived that hot working is required for the globularization of the α phase in traditional manufacturing. In this article, we report an innovative strategy to obtain a tri-modal microstructure consisting of globularized α in laser powder bed fusion (L-PBF) Ti–6.5Al–2Zr–1Mo–1V (TA15) alloy, which only consists of post-process heat treatment. A tri-modal microstructure formed by the equiaxed α, lamellar α, and transformed β matrix may be effectively introduced by the multiple annealing heat treatment. A significant improvement in ductility by 72.32% was obtained with final microstructure leads, maintaining a desired high strength and providing tensile properties comparable to those of its forging counterparts. 

Achieving an ideal combination of strength and plasticity in additive manufactured Ti–6.5Al–2Zr–1Mo–1V alloy through the development of tri-modal microstructure

Anti-swellable cellulose hydrogel for underwater sensing.

Biomass-based epoxy resin derived from resveratrol with high temperature resistance and intrinsic flame retardant properties

Tri-modal microstructure in high temperature toughening and low temperature strengthening treatments of near-β forged TA15 Ti-alloy

Reversible photo-responsive smart wood with resistant to extreme weather

The preparation, properties, functionality of a eugenol-based epoxy resin for bronze ware repairment

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