An all-nanofibrous Janus textile with directional perspiration for triboelectric nanogenerator and self-powered e-skin sensor

Cheng, Ya; Wang, Jing; Lu, Xiaofeng; Wang, Ce

doi:10.1016/j.nanoen.2023.108852

Cited by 16 publications

(4 citation statements)

References 47 publications

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“…The water collection of the membrane with large pores in the hydrophobic layer and small pores in the hydrophilic layer was 6.76 ± 0.75 g/cm 2 /h, which was higher than that of the membrane with small pores in the hydrophobic layer and large pores in the hydrophilic layer (4.51 ± 0.03 g/cm 2 /h) . Similar results have also been reported by other researchers. , Choi’s research team provided a detailed explanation of the relationship between pore size and capillary pressure. When the pore size of the hydrophobic layer was smaller than that of the hydrophilic layer, the capillary pressure provided by the hydrophobic layer would be higher, while the capillary pressure provided by the hydrophilic layer was less than that of the former.…”

Section: Introductionsupporting

confidence: 86%

“…7 Similar results have also been reported by other researchers. 17,18 Choi's research team provided a detailed explanation of the relationship between pore size and capillary pressure. When the pore size of the hydrophobic layer was smaller than that of the hydrophilic layer, the capillary pressure provided by the hydrophobic layer would be higher, while the capillary pressure provided by the hydrophilic layer was less than that of the former.…”

Section: Introductionmentioning

confidence: 99%

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Sandwich-Structured Nanofiber Membranes with Dual-Directional Water-Transport Ability for High-Efficiency Water Harvesting

Bao,

Zhang,

Zhang

et al. 2024

ACS Appl. Polym. Mater.

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Previous research on water harvesting driven by directional water transport from ubiquitous atmospheric moisture is mainly based on one-dimensional (1D) filaments with asymmetric hydrophilic/hydrophobic wettability along the filaments, two-dimensional (2D) surfaces with hydrophilic and hydrophobic patterns, and three-dimensional (3D) porous structures with "Janus" wettability from hydrophilic to hydrophobic. However, it remains an ongoing challenge to design and construct porous fibrous membranes with efficient directional water transport capability in the thickness direction and excellent water-collection performance. Herein, a sandwich-structured nanofibrous membrane showing unusual dualdirectional wicking capability has been developed for water harvesting. In comparison to the Janus membrane with a water-collection efficiency of 45.92 g/cm 2 /h, such a dual-directional wicking fibrous membrane has a much higher water-collection capacity (425.96 g/cm 2 /h) and excellent water-storage capacity. The highly efficient water-harvesting capacity originates from the strong force to draw water from the outer hydrophobic layer to the middle superhydrophilic layer and the permeable channels formed by the hydrophobic fibrous structures. The large pores in the outer hydrophobic layer and the small pores in the middle superhydrophilic layer facilitate water harvesting because of the dual-directional water-transport ability. The successful preparation of dual-directional wicking nanofiber membranes would be valuable for the development of advanced water harvesters for diversified applications.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Sandwich-Structured Nanofiber Membranes with Dual-Directional Water-Transport Ability for High-Efficiency Water Harvesting

Bao,

Zhang,

Zhang

et al. 2024

ACS Appl. Polym. Mater.

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“…However, previous Janus membrane-based skin sensors utilized materials such as silks, fibers, and foams, making them difficult to have thickness lower than 10 μm, and external adhesive are needed for skin adhesion. − The thickness of the film is important for achieving wearability. When decreasing the thickness of thin films, dry films could show self-adhesiveness to skin surface .…”

Section: Introductionmentioning

confidence: 99%

Janus Membrane-Based Wearable pH Sensor with Sweat Absorption, Gas Permeability, and Self-Adhesiveness

Wang,

Harimurti,

Inoue

et al. 2024

ACS Appl. Mater. Interfaces

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Wearable biomedical sensors have enabled noninvasive and continuous physiological monitoring for daily health management and early detection of chronic diseases. Among biomedical sensors, wearable pH sensors attracted significant interest, as pH influences most biological reactions. However, conformable pH sensors that have sweat absorption ability, are self-adhesive to the skin, and are gas permeable remain largely unexplored. In this study, we present a pioneering approach to this problem by developing a Janus membrane-based pH sensor with self-adhesiveness on the skin. The sensor is composed of a hydrophobic polyurethane–polydimethylsiloxane porous hundreds nanometer-thick substrate and a hydrophilic poly(vinyl alcohol)–poly(acrylic acid) porous nanofiber layer. This Janus membrane exhibits a thickness of around 10 μm, providing a conformable adhesion to the skin. The simultaneous realization of solution absorption, gas permeability, and self-adhesiveness makes it suitable for long-term continuous monitoring without compromising the comfort of the wearer. The pH sensor was tested successfully for continuous monitoring for 7.5 h, demonstrating its potential for stable analysis of skin health conditions. The Janus membrane-based pH sensor holds significant promise for comprehensive skin health monitoring and wearable biomedical applications.

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“…Chen’s team designed a material with different hydrophilicity along the thickness direction through electrostatic spinning/electrospray technology, which exhibited hydrophilicity on the side close to the skin, and, thus, providing a good solution to the effects at the interface between the e-skin and the skin. This work presents a new approach to designing electronic skin that can also be used to detect human health [ 24 ]. Liu et al proposed a self-powered sensor for detecting the wear and tear of human prosthetic joints, which could be used to detect debris from prosthetic wear and tear.…”

Section: Introductionmentioning

confidence: 99%

Fish Scale for Wearable, Self-Powered TENG

Zhao,

Han,

Zhang

et al. 2024

Nanomaterials

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Flexible and wearable devices are attracting more and more attention. Herein, we propose a self-powered triboelectric nanogenerator based on the triboelectric effect of fish scales. As the pressure on the nanogenerator increases, the output voltage of the triboelectric nanogenerator increases. The nanogenerator can output a voltage of 7.4 V and a short-circuit current of 0.18 μA under a pressure of 50 N. The triboelectric effect of fish scales was argued to be related to the lamellar structure composed of collagen fiber bundles. The nanogenerator prepared by fish scales can sensitively perceive human activities such as walking, finger tapping, and elbow bending. Moreover, fish scales are a biomass material with good biocompatibility with the body. The fish-scale nanogenerator is a kind of flexible, wearable, and self-powered triboelectric nanogenerator showing great prospects in healthcare and body information monitoring.

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An all-nanofibrous Janus textile with directional perspiration for triboelectric nanogenerator and self-powered e-skin sensor

Cited by 16 publications

References 47 publications

Sandwich-Structured Nanofiber Membranes with Dual-Directional Water-Transport Ability for High-Efficiency Water Harvesting

Sandwich-Structured Nanofiber Membranes with Dual-Directional Water-Transport Ability for High-Efficiency Water Harvesting

Janus Membrane-Based Wearable pH Sensor with Sweat Absorption, Gas Permeability, and Self-Adhesiveness

Fish Scale for Wearable, Self-Powered TENG

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