A porous PDMS pulsewave sensor with haircell structures for water vapor transmission rate and signal-to-noise ratio enhancement

Seok, Minho; Yoon, Sunghyun; Kim, Mookyum; Cho, Young-Ho

doi:10.1039/d1na00180a

Cited by 6 publications

(9 citation statements)

References 30 publications

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“…The high repeatability of resistance changes demonstrates the reliability of hydrogels as a wearable sensor (Figure S13, Supporting Information). The literature reports that increasing the contact area can effectively improve the SNR; [ 27 ] so, we calculated the SNR values of the wrinkled sensor based on the output signals of the limb motions (Figure S14, Supporting Information). The result indicated that the wrinkled hydrogel sensor has a considerable SNR value with a maximum of 5021, which lays the foundation for accurate monitoring of cardiac signals.…”

Section: Resultsmentioning

confidence: 99%

Highly Stretchable and Biocompatible Wrinkled Nanoclay‐Composite Hydrogel With Enhanced Sensing Capability for Precise Detection of Myocardial Infarction

et al. 2023

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It is challenging to balance high biocompability with good mechanical–electrical sensing performance, especially when triggering inflammatory stress response after in vivo implantation. Herein, a bioinspired wrinkle‐reinforced adaptive nanoclay‐interlocked soft strain‐sensor based on a highly stretchable and elastic ionic‐conductive hydrogel is reported. This novel nanoclay‐composite hydrogel exhibits excellent tensile properties and high sensing capacity with steady and reliable sensing performance due to the structural–mechanical–electrical integrity of the nanoclay crosslinked and nano‐reinforced interpenetrating network. The incorporation of amphiphilic ions provides the hydrogel with significant protein resistance, reducing its non‐specific adsorption to proteins upon implantation, improving its biosafety as an implanted device, and maintaining the authenticity of the sensing results. Based on the revealed sensing enhanced mechanism based on hierarchical ordered structures as a proof‐of‐concept application, this hydrogel sensor is demonstrated to be able to accurately localize the region where myocardial infarction occurs and may become a novel strategy for real‐time monitoring of pathological changes in heart disease.

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Section: Resultsmentioning

confidence: 99%

Highly Stretchable and Biocompatible Wrinkled Nanoclay‐Composite Hydrogel With Enhanced Sensing Capability for Precise Detection of Myocardial Infarction

et al. 2023

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“…As a result, the pore size of 21 μm and the porosity of 45% at the weight ratio of 0.5:1 were selected. Further details are referenced in our previous study …”

Section: Resultsmentioning

confidence: 99%

“…Further details are referenced in our previous study. 37 Then, we considered higher moisture permeability than the skin perspiration level of 432 g/m 2 /day as the first design guideline for the chamber layer thickness. Four different porous PDMSs with thicknesses of 250, 300, 400, and 500 μm, which were greater than the chamber height of 100 μm, were fabricated for measurement of the water vapor transmission rate (WVTR).…”

Section: Design Of the Chamber Layer Materials And Thickness For High...mentioning

confidence: 99%

Reusable and Porous Skin Patches with Thermopneumatic Adhesion Control Capability and High Water Vapor Permeability

Seok,

Choi,

Cho

2023

ACS Appl. Mater. Interfaces

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We present a reusable and porous skin patch (RPS patch) capable of controlling adhesion force with a thermal− pneumatic method for repetitive use as well as improving moisture permeability for long-term use without skin troubles. Previous skin patches cause skin troubles due to high adhesion force (∼30 kPa) and low moisture permeability (∼382 g/m 2 /day), hindering them from repeatable and long-term use. We control the skin adhesion force of the RPS patch using thermopneumatic pressure generated by an embedded heater on multiple chamber arrays. The RPS patch controls the adhesion force ranging from 8 to 29 kPa on both dry and wet skin while keeping the stable adhesion force for 48 h. It shows repeatable adhesion up to 100 times, and the adhesion force is restored after the RPS patch is washed with water, thus enabling repetitive skin adhesion. We improve the moisture permeability of the RPS patch to 733 g/m 2 / day while maintaining the adhesion force by making the RPS patch with porous materials. The RPS patch shows no skin troubles for 7 days of attachment, thereby being available for long-term skin attachment. The RPS patch, having adhesion control capability and high moisture permeability, shows potential for use in daily life in biomedical applications, including wearable sensors, medical adhesives, and rehabilitation robots.

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“…The laminated fabrics behave as porous membranes with WVTRs higher than the rate of transepidermal water loss (TEWL) of adult skin under normal conditions (5-10 g/h m 2 ) and within the range of TEWL during sweating (6-66 g/h m 2 ). Our samples also have WVTRs higher than those of non-porous 8 μm [54] and highly porous (45%) 40 μm [55] films of polydimethylsiloxane (5-6 and 20.3 g/h m 2 , respectively), which are elastomers commonly used in wearable devices. Therefore the data cumulatively suggest that fabric lamination with the adhesive film has a minimal blocking effect on moisture permeability.…”

Section: Air Permeability and Water Vapor Transmission Characterizationmentioning

confidence: 92%

Stretchable, Breathable, and Washable Fabric Sensor for Human Motion Monitoring

Sánchez-Botero

Agrawala

Kramer‐Bottiglio

2023

Adv Materials Technologies

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Wearable strain sensors for movement tracking are a promising paradigm to improve clinical care for patients with neurological or musculoskeletal conditions, with further applicability to athletic wear, virtual reality, and next‐generation game controllers. Clothing‐like wearable strain sensors can support these use cases, as the fabrics used for clothing are generally lightweight and breathable, and interface with the skin in a manner that is mechanically and thermally familiar. Herein, a fabric capacitive strain sensor is presented and integrated into everyday clothing to measure human motions. The sensor is made of thin layers of breathable fabrics and exhibits high strains (>90%), excellent cyclic stability (>5000 cycles), and high water vapor transmission rates (≈50 g/h m2), the latter of which allows for sweat evaporation, an essential parameter of comfort. The sensor's functionality is verified under conditions similar to those experienced on the surface of the human body (35°C and % relative humidity) and after washing with fabric detergent. In addition, the fabric sensor shows stable capacitance at excitation frequencies up to 1 MHz, facilitating its low‐cost implementation in the Arduino environment. Finally, as a proof of concept, multiple fabric sensors are seamlessly integrated with commercial activewear to collect movement data. With the prioritization of breathability (air permeability and water vapor transmission), the fabric sensor design presented herein paves the way for future comfortable, unobtrusive, and discrete sensory clothing.

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A porous PDMS pulsewave sensor with haircell structures for water vapor transmission rate and signal-to-noise ratio enhancement

Abstract: We present a porous polydimethylsiloxane (PDMS) pulsewave sensor with haircell structures that improves both water vapor transmission rate (WVTR) and signal-to-noise ratio (SNR).

Cited by 6 publications

References 30 publications

Highly Stretchable and Biocompatible Wrinkled Nanoclay‐Composite Hydrogel With Enhanced Sensing Capability for Precise Detection of Myocardial Infarction

Highly Stretchable and Biocompatible Wrinkled Nanoclay‐Composite Hydrogel With Enhanced Sensing Capability for Precise Detection of Myocardial Infarction

Reusable and Porous Skin Patches with Thermopneumatic Adhesion Control Capability and High Water Vapor Permeability

Stretchable, Breathable, and Washable Fabric Sensor for Human Motion Monitoring

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