Electrospun thermoplastic polyurethane membrane decorated with carbon nanotubes: A platform of flexible strain sensors for human motion monitoring

Polymer, Journal Year: 2024, Volume and Issue: 303, P. 127120 - 127120

Published: May 1, 2024

A piezoresistive flexible strain sensor was developed using thermoplastic polyurethane elastomers (TPU) as the matrix and carbon nanotubes (CNTs) conductive fillers. Sensitivity, range, tensile cycling stability were concurrently considered during its design. Electrospun TPU fiber membranes prepared via electrospinning in this experiment, with controllable diameter achieved by adjusting rotational speed of receiving drum. CNTs incorporated into a polymer substrate through suction filtration to create sensor. The support structure electrospun film served carrier for uniformly adhering particles. Well-dispersed could more easily achieve uniform loading pore size film, thereby forming layer. This study initially determined influence content spinning solution on morphology membrane. Subsequently, effects CNT drum microstructure investigated, along their impact microstructure, mechanical properties, sensing performance CNTs/TPU (CT) sensors. results indicate that membrane under conditions mass fraction 20 wt% 100 r/min has larger average stable scaffold structure. sensor, filtering 10 mL concentration 2 mg/mL, exhibited best strength elongation at break 6.22 MPa 575%, respectively. Additionally, it demonstrated high sensitivity (GF=420.17 200% strain) excellent durability (300 cycle tests), enabling quick accurate responses movements various parts human body, meeting basic usage requirements

Language: Английский

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Poly(vinyl alcohol)/polyacrylamide double‐network ionic conductive hydrogel strain sensor with high sensitivity and high elongation at break

Journal of Polymer Science, Journal Year: 2024, Volume and Issue: 62(20), P. 4599 - 4611

Published: July 19, 2024

Abstract As a soft material with biocompatibility and stimulation response, ionic conductive hydrogel‐based wearable strain sensors show great potential across wide spectrum of engineering disciplines, but their mechanical toughness is limited in practical applications. In this study, freeze‐thawing techniques were utilized to fabricate double‐network hydrogels poly(vinyl alcohol)/polyacrylamide (PVA/PAM) both covalent physical cross‐linking networks. These demonstrate excellent performance, an elongation at break 2253% tensile strength 268.2 kPa. Simultaneously, they also display high sensitivity (Gage factor, GF = 2.32 0%–200% strain), achieve rapid response time 368 ms without the addition extra fillers or ions, stable signal transmission even after multiple cycles, fast human motion detection.

Language: Английский

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Multiple-Language-Responsive Conductive Hydrogel Composites for Flexible Strain and Epidermis Sensors

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(7), P. 4233 - 4243

Published: March 22, 2024

Conductive hydrogels are considered highly promising materials for developing skin-like sensors due to their excellent biocompatibility and mechanical flexibility. However, limited stretchability, low toughness, fatigue resistance hinder sensing capabilities durability. To overcome these limitations, we developed a conductive hydrogel composite with high performance the ability respond identify different languages. The prepared by incorporating functionalized multiwalled carbon tubes (F-CNTs) into hydrophobically associated polyacrylamide (AM) lauryl methacrylate (Lmc) hydrogels. ensure uniform dispersion of F-CNTs in network, cationic surfactant cetyldimethylethylammonium bromide (CDAB) is used; carboxylic group on cross-links micelles polymer chains through electrostatic interactions. also facilitates formation hydrophobic interactions between matrix F-CNT surface. This greatly improves properties hydrogel, resulting stretchability 2016%, toughness 551.56 kJ m–3, an antifatigue property. exhibits tensile strain sensitivity gauge factor 4.69 at 600% strain. hybrid hydrogel-based demonstrate capabilities, not only detecting full-range human activities but differentiating languages (English, Urdu, Pushto) both speaking writing. Besides sensing, has capability mimic skin touchable screen like metal. These results highlight potential F-CNT-based as wearable sensor flexible devices.

Language: Английский

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Synchronous enhancement of safety protection and impact perception in intelligent leather

Advanced Composites and Hybrid Materials, Journal Year: 2025, Volume and Issue: 8(1)

Published: Jan. 21, 2025

High protection performance and intelligence are gradually becoming indispensable key factors with the ever-improving personal protective equipment. However, material that can not only resist but also percept full type of impacts is an urgent need due to complex combat scenarios. This work reports intelligent leather/shear stiffening gel (SSG)/Kevlar-shear thickening fluid (STF)/non-woven fabric (LSKSN) composite, which exhibits superior comprehensive impact resistance in needle puncture, knife ballistic impact, blunt impact. Especially, LSKSN composite improves puncture by 71% still maintains a large after being punctured. Moreover, possesses high limit penetrated velocity 159 m s−1 dissipate energy 24.6 J, causing bulletproof be improved 22%. Due excellent force-buffering rate-dependent dissipation characteristics wide-impact energy, maximum rate reaches 95%. Simultaneously, further developed electronic (E-LSKSN) shows outstanding perceptual capability, sensitive various accurately identify types through different changes (10–8000%) response times (0.1–100 ms). Finally, based on bending sensing properties E-LSKSN wireless signal transmission system constructed monitor safety movement status human body real-time, demonstrates this potential next generation

Language: Английский

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Flexible porous non-woven silk fabric based conductive composite for efficient multimodal sensing

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 497, P. 154445 - 154445

Published: Aug. 3, 2024

Language: Английский

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PEDOTs‐Based Conductive Hydrogels: Design, Fabrications, and Applications

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

Published: Dec. 23, 2024

Abstract Conductive hydrogels combine the benefits of soft with electrical conductivity and have gained significant attention over past decade. These innovative materials, including poly(3,4‐ethylenedioxythiophene) (PEDOTs)‐based conductive (P‐CHs), are promising for flexible electronics biological applications due to their tunable flexibility, biocompatibility, hydrophilicity. Despite recent advances, intrinsic correlation between design, fabrications, P‐CHs has been mostly based on trial‐and‐error‐based Edisonian approaches, significantly limiting further development. This review comprehensively examines design strategies, fabrication technologies, diverse P‐CHs. By summarizing such as molecular, network, phase, structural engineering, exploring both 2D 3D techniques, this offers a comprehensive overview in fields bioelectronics, actuators, energy devices, solar evaporators. Establishing critical internal connection fabrication, application aims guide future research stimulate innovation field functional P‐CHs, offering broad multidisciplinary researchers.

Language: Английский

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Advances in multifunctional flexible MXene-based stress sensors

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(22), P. 7845 - 7861

Published: Jan. 1, 2024

This article reviews the fabrication methods, structural design, sensing performances and multifunctional applications of MXene-based stress sensors, their challenges development trends are also discussed.

Language: Английский

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Stretchable, Self‐Healing, and Bioactive Hydrogel with High‐Functionality N,N‐bis(acryloyl)cystamine Dynamically Bonded Ag@polydopamine Crosslinkers for Wearable Sensors

Advanced Science, Journal Year: 2024, Volume and Issue: unknown

Published: July 19, 2024

Hydrogels present attractive opportunities as flexible sensors due to their soft nature and tunable physicochemical properties. Despite significant advances, practical application of hydrogel-based sensor is limited by the lack general routes fabricate materials with combination mechanical, conductive, biological Here, a multi-functional hydrogel reported in situ polymerizing acrylamide (AM) N,N'-bis(acryloyl)cystamine (BA) dynamic crosslinked silver-modified polydopamine (PDA) nanoparticles, namely PAM/BA-Ag@PDA. Compared traditional polyacrylamide (PAM) hydrogel, BA-Ag@PDA nanoparticles provide both high-functionality crosslinks multiple interactions within PAM networks, thereby endowing optimized PAM/BA-Ag@PDA significantly enhanced tensile/compressive strength (349.80 kPa at 383.57% tensile strain, 263.08 90% compressive strain), lower hysteresis (5.2%), improved conductivity (2.51 S m

Language: Английский

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An Overview of Polymeric Hydrogel Applications for Sustainable Agriculture

Agriculture, Journal Year: 2024, Volume and Issue: 14(6), P. 840 - 840

Published: May 27, 2024

Agriculture, a vital element of human survival, confronts challenges meeting rising demand due to population growth and product availability in developing nations. Reliance on pesticides fertilizers strains natural resources, leading soil degradation water scarcity. Addressing these issues necessitates enhancing efficiency agriculture. Polymeric hydrogels, with their unique retention nutrient-release capabilities, offer promising solutions. These superabsorbent materials form three-dimensional networks retaining substantial amounts water. Their physicochemical properties suit various applications, including Production involves methods like bulk, solution, suspension polymerization, cross-linking, essential for achieved through physical or chemical means, each different advantages. Grafting techniques incorporate functional groups into matrices, while radiation synthesis offers purity reduced toxicity. Hydrogels provide versatile solutions tackle scarcity Recent research explores hydrogel formulations optimal agricultural performance, plant growth. This review aims comprehensive overview technologies as adaptable addressing agriculture, ongoing refining use.

Language: Английский

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Multifunctional Capabilities of Malonic Acid-Bridged Conductive Hydrogels for Wearable Electronic Devices

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: 6(16), P. 9940 - 9951

Published: Aug. 12, 2024

Flexible and strain-sensing smart materials have received significant attention from researchers due to their potential use in human motion detection, soft robotics, epidermis sensors, energy storage devices, etc. However, low mechanical strength, range sensitivity, high time response, antifatigue resistance hampered the application of previously fabricated materials. Herein, a malonic acid (MA)-reinforced hydrogel was prepared through one-pot-free radical polymerization, which MA makes bridge by connecting hydrophobically associated polyacrylamide (PAmm) polydodecyl methacrylate (PDDMA) physical cross-linking. Ethyl-hexadecyl dimethylammonium bromide (EHDDAB), cationic surfactant, is used ensure formation micelles. The micelles polymer chains are bridged via interactions electrostatic charge enhanced dicarboxylic groups present on molecules. Notable strength observed for MA4 with 2102% strain, 2.36 MPa stress, excellent cyclic stability. At 500% suggests sensitivity tensile as indicated its gauge factor 6.9 fast response recovery time. Meanwhile, ionic conductivity after addition LiCl calculated 0.20 S/m. Furthermore, practical applications were detection different motions like finger bending, wrist movement, elbow knee movements. Similarly, small physiological larynx vibration detected speaking, coughing, drinking water. an electronic pen showed responses multiple languages both speaking writing. MA-regulated hydrogels show possibility flexible many applications, including touch screens, biomedical monitoring, robotic devices.

Language: Английский

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