Breathable Nanomesh Humidity Sensor for Real-Time Skin Humidity Monitoring

Jeong, Wooseong; Song, Jin‐Kyu; Bae, Jaewan; Nandanapalli, Koteeswara Reddy; Lee, Seongwon

doi:10.1021/acsami.9b17584

Cited by 121 publications

(95 citation statements)

References 27 publications

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“…[ 109 , 165 ] In terms of the key future direction, researchers should focus on the new absorbent materials with novel structures and biocompatibility, such as the swellable and conductive material with a nanomesh structure. [ 166 , 167 ]…”

Section: Advances Of Wearable Sweat Loss Measuring Devicesmentioning

confidence: 99%

Wearable Sweat Loss Measuring Devices: From the Role of Sweat Loss to Advanced Mechanisms and Designs

et al. 2021

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Wearable sweat sensors have received significant research interest and have become popular as sweat contains considerable health information about physiological and psychological states. However, measured biomarker concentrations vary with sweat rates, which has a significant effect on the accuracy and reliability of sweat biosensors. Wearable sweat loss measuring devices (SLMDs) have recently been proposed to overcome the limitations of biomarker tracking and reduce inter-and intraindividual variability. In addition, they offer substantial potential for monitoring human body homeostasis, because sweat loss plays an indispensable role in thermoregulation and skin hydration. Previous studies have not carried out a comprehensive and systematic review of the principles, importance, and development of wearable SLMDs. This paper reviews wearable SLMDs with a new health perspective from the role of sweat loss to advanced mechanisms and designs. Two types of sweat and their measurement significance for practical applications are highlighted. Then, a comprehensive review of advances in different wearable SLMDs based on hygrometers, absorbent materials, and microfluidics is presented by describing their respective device architectures, present situations, and future directions. Finally, concluding remarks on opportunities for future application fields and challenges for future sweat sensing are presented.

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Section: Advances Of Wearable Sweat Loss Measuring Devicesmentioning

confidence: 99%

Wearable Sweat Loss Measuring Devices: From the Role of Sweat Loss to Advanced Mechanisms and Designs

et al. 2021

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“…[16][17][18][19][20][21] Since these electrodes are less likely to inhibit water evaporation from skin, it is expected that measurements could be performed in a nearly natural state without causing skin dampness by wearing them. In addition, there are reports on electrodes that use highly biocompatible materials such as poly-vinyl-alcohol (PVA), [18,21] gels, [22] and silk fibroin for biocompatibility. [23,24] Biocompatibility is especially important when considering the wearing of electrodes on patients with skin diseases.…”

Section: Doi: 101002/adhm202001322mentioning

confidence: 99%

“…For example, high water vapor permeability is achieved by processing the electrodes into a suitable porous shape or by fabricating electrodes on a porous substrate. [ 16‐21 ] Since these electrodes are less likely to inhibit water evaporation from skin, it is expected that measurements could be performed in a nearly natural state without causing skin dampness by wearing them. In addition, there are reports on electrodes that use highly biocompatible materials such as poly‐vinyl‐alcohol (PVA), [ 18,21 ] gels, [ 22 ] and silk fibroin for biocompatibility.…”

Section: Electrode Conductivity [S M−1] Thickness [µM] Water Vapor Pementioning

confidence: 99%

Skin Impedance Measurements with Nanomesh Electrodes for Monitoring Skin Hydration

Matsukawa

Miyamoto

Yokota

2020

Adv Healthcare Materials

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The importance of continuous monitoring of skin hydration in daily life, to aid in the diagnosis of skin diseases, is rising. Electrodes that can be worn directly on the skin are attracting attention as an effective means. However, they should not inhibit natural water evaporation from the skin and should not cause inflammation or irritation even if they are attached to the body for long periods of time. In this study, nanomesh electrodes that have previously been reported to exhibit high biocompatibility are also found to exhibit high water vapor permeability, resulting in properties that prevent skin dampness. Furthermore, the skin impedance measured using nanomesh electrodes is found to correlate with the hydration level of skin measured using existing medical equipment. This study provides a new approach to measure skin hydration in conditions close to bare skin. Skin is the outermost organ of the body and acts as a barrier separating the inside of the body from the outside world. Skin is essential to prevent the entry of pathogens and contaminants from the outside environment into the body, as well as to prevent excessive evaporation of water from the body. The stratum corneum, the outermost layer of the skin, serves as a barrier that inhibits water evaporation from the skin called trans-epidermal water loss (TEWL). [1] When the stratum corneum is damaged, the water in skin evaporates more easily to the outside world, making the skin prone to dryness. [2] Therefore, it is important to measure the skin hydration levels to assess the barrier function of the stratum corneum. The evaluation of the stratum corneum's barrier function has attracted significant attention from the cosmetic and medical fields as it is useful for understanding the characteristics of an individual's skin and diagnosing skin diseases such as atopic dermatitis, [3] ichthyosis vulgaris, [4] and psoriasis. [5] Skin hydration levels are commonly measured indirectly by measuring the skin's electrical properties, such as the skin impedance and skin capacitance. This is because the higher the hydration level of the skin, the higher the conductivity and dielectric constant. [6,7] In the medical community, the electrical properties of the skin are measured using probes with rigid electrodes

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“…Apart from the force‐sensing techniques, temperature‐ and humidity‐based tactile sensors have been reported. [ 64–69 ] For example, a pressure–temperature dual‐mode smart skin was proposed based on piezoresistive and thermoelectric‐based techniques, where temperature differences on the sensor's upper and lower surfaces would generate a voltage signal. [ 65 ] The sensor exhibited a temperature gradient sensing range of 0–40 °C and resolution of 0.1 °C.…”

Section: Tactile‐enabled Humanoidsmentioning

confidence: 99%

Tactile and Vision Perception for Intelligent Humanoids

Gao

Dai

Nathan

2021

Advanced Intelligent Systems

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Touch and vision perception are two important functions humans use to interact with the real world. To mimic human‐like abilities, tactile‐ and visual‐sensing‐based intelligent humanoids have emerged and are going through a fast phase of development. Studies have demonstrated that the combination of tactile and visual information not only enables humanoids to better learn the environment, but also allows them to have pseudocognitive ability. Being a new and rapidly developing field of research, a significant growth in articles reporting different aspects of sensing and related machine learning is being witnessed. To help readers comprehensively understand the fundamentals and insights, and the current state of the art, this review is compiled to explain the working mechanisms of tactile and visual sensing, introduce the application of intelligent humanoids in diverse scenarios, discuss current challenges, and predict future trends.

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Breathable Nanomesh Humidity Sensor for Real-Time Skin Humidity Monitoring

Cited by 121 publications

References 27 publications

Wearable Sweat Loss Measuring Devices: From the Role of Sweat Loss to Advanced Mechanisms and Designs

Wearable Sweat Loss Measuring Devices: From the Role of Sweat Loss to Advanced Mechanisms and Designs

Skin Impedance Measurements with Nanomesh Electrodes for Monitoring Skin Hydration

Tactile and Vision Perception for Intelligent Humanoids

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