Advances in Soft Strain and Pressure Sensors

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Фев. 11, 2025

Soft strain and pressure sensors represent a breakthrough in material engineering nanotechnology, providing accurate reliable signal detection for applications health monitoring, sports management, human-machine interface, or soft robotics, when compared to traditional rigid sensors. However, their performance is often compromised by environmental interference off-axis mechanical deformations, which lead nonspecific responses, as well unstable inaccurate measurements. These challenges can be effectively addressed enhancing the sensors' specificity, making them responsive only desired stimulus while remaining insensitive unwanted stimuli. This review systematically examines various materials design strategies developing with high specificity target physical signals, such tactility, distribution, body motions, artery pulse. highlights approaches that impart special properties suppress from factors temperature, humidity, liquid contact. Additionally, it details structural designs improve sensor under different types of deformations. concludes discussing ongoing opportunities inspiring future development highly specific electromechanical

Язык: Английский

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Soft Robots Proprioception Through Stretchable Laser‐Induced Graphene Strain Sensors

Advanced Intelligent Systems, Год журнала: 2025, Номер unknown

Опубликована: Март 2, 2025

Soft robotic grippers enable the safe manipulation of delicate objects, guaranteeing their integrity when handled and collected. Integrating sensors into these can proprioception but must avoid compromising flexibility or functionality. This study presents a pneumatic finger‐based soft gripper with novel piezoresistive sensor made laser‐induced graphene (LIG) embedded in dragon skin (DS), an elastomer matrix, offering continuous bending angle measurement. The LIG/DS composite is studied to confirm minimal impact on gripper's stiffness. Mechanical electromechanical characterizations are performed for two designs, n 1 2 . Design exhibits superior performance, gauge factor , linear response up 30% strain, durability exceeding 10 000 cycles. A finite‐element method analysis identifies fingers’ neutral plane, guiding optimal placement. Experimental validation confirms theoretical predictions finds ideal location, achieving 110° low hysteresis (8%). enables real‐time monitoring finger during grasping tasks, calibration curve linking resistance changes angles. cost‐effective, stretchable, durable demonstrates high potential applications, precise reliable without properties.

Язык: Английский

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Gelation‐Constrained Freeze‐Casting Fabrication of Ultra‐Homogeneous Nanocomposite Aerogels with Superelasticity and Harsh Environment Tolerance

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 18, 2025

Abstract Freeze casting is a versatile technique for organizing low‐dimensional building blocks into ordered porous structural materials. However, the freeze‐casting fabrication of materials with robust and topologically elastic skeleton to withstand harsh conditions challenging. Herein, silanized ultra‐homogeneous nanocomposite aerogel fabricated using gelation‐constrained strategy. Diverging from traditional methods employing solution precursor, approach involves process utilizing rational‐designed supramolecular hydrogel as quasi‐solid precursor. The within hydrogel, enclosed in dense hydrogen‐bonded network, effectively mitigate secondary agglomeration caused by ice crystallization concentration enrichment during freeze‐casting. By forming cellular an interconnected nanoparticle resulting aerogels exhibit exceptional mechanical elasticity retaining over 98% height after 10 000 compression cycles, along superior electrical properties showing 78.9% increase conductivity compared conventional aerogels. Wearable piezoresistive sensors these demonstrate outstanding force sensing capabilities, broad linear range (0–17.6 kPa) high sensitivity (1.32 kPa −1 ). When integrated intermediate layer protective garments, offer insulation fire resistance, enabling them endure like repetitive extreme deformations, exposure high‐temperature flames, water‐erosion damages.

Язык: Английский

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An Antidehydration Hydrogel Based on Zwitterionic Oligomers for Bioelectronic Interfacing

Advanced Materials, Год журнала: 2023, Номер unknown

Опубликована: Ноя. 30, 2023

Abstract Hydrogels are ideal interfacing materials for on‐skin healthcare devices, yet their susceptibility to dehydration hinders practical use. While incorporating hygroscopic metal salts can prevent and maintain ionic conductivity, concerns arise regarding toxicity due the passage of small ions through skin barrier. Herein, an antidehydration hydrogel enabled by incorporation zwitterionic oligomers into its network is reported. This exhibits exceptional water retention properties, maintaining ≈88% weight at 40% relative humidity, 25 °C 50 days about 84% after being heated 3 h. Crucially, molecular design embedded prevents penetration epidermis, as evidenced experimental simulation results. The allows stable signal acquisition in electrophysiological monitoring humans plants under low‐humidity conditions. research provides a promising strategy development epidermis‐safe biocompatible interfaces devices.

Язык: Английский

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Spatial hetero-structured composites with ultrawide linear range for positive-negative pressure sensing and e-skin of bionic fish

Nano Energy, Год журнала: 2023, Номер 120, С. 109173 - 109173

Опубликована: Дек. 6, 2023

Язык: Английский

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