Sweat-collecting patch impressed by cactus spines


Schematic illustration of cactus spine-inspired epidermal sweat-collecting patch and the droplet transportation by way of the wedge-patterned channel. Credit: POSTECH

A sweat-collecting patch has been developed utilizing the precept based mostly on how the cactus spines entice water.

Sweat is an efficient physique fluid for analyzing bioanalytes within the physique with out amassing blood. The sweat sensor can scale back the trouble for diabetic patients who repeatedly have to attract blood, and may also be utilized in wearable devices for day by day healthcare monitoring. However, the sensible use of sweat sensors is impeded by irregular and low sweat secretion charges. There is a urgent must successfully accumulate these sweat secretions.

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To this, a analysis group led by Professor Kilwon Cho and Ph.D candidate Jonghyun Son of POSTECH’s Department of Chemical Engineering has lately developed a skin-attachable patch that shortly collects sweat by mimicking the precept behind cactus spines.

Cacti, which develop in arid environments, transfer water droplets that type on the tip of their spines to their base with a purpose to survive. During this course of, the positive water droplets transfer as a result of distinction in stress appearing on the within and outdoors of the curved floor of the water droplet. This phenomenon known as the Laplace stress.

The patch newly developed by Professor Kilwon Cho’s analysis group utilized this precept of how cactus spines accumulate water. The researchers mimicked the construction of the cactus backbone through the use of the wedge-shaped wettability patterns with superhydrophobic/superhydrophilic surfaces. Through this, a sweat droplet on the wedge-patterned floor spontaneously strikes to the huge finish of the wedge sample as a result of the Laplace stress distinction between the back and front surfaces of the droplet is maximized.

The outcomes affirm that the wedge-patterned channel can accumulate sweat shortly and spontaneously whatever the inclination of the microfluidic channels, with out the necessity for added power. In addition, the wedge-patterned channel reveals nice sweat-collecting effectivity because it transports almost all sweat droplets to the sensing space with out leaving a lot behind contained in the channel, enabling it to gather sweat a lot quicker than the traditional microfluidic channels. This permits the patch to constantly monitor the bioanalytes within the blood.

“Difficulties in collecting sweat has hindered its use in wearable healthcare devices,” defined Professor Kilwon Cho of POSTECH. He added, “This newly developed patch solves that issue by quickly collecting sweat and facilitating its use in various wearable healthcare devices, including blood sugar monitoring.”

The analysis was revealed in Advanced Materials.

Personalized sweat sensor reliably monitors blood glucose without finger pricks

More info:
Jonghyun Son et al, Cactus‐Spine‐Inspired Sweat‐Collecting Patch for Fast and Continuous Monitoring of Sweat, Advanced Materials (2021). DOI: 10.1002/adma.202102740

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Pohang University of Science & Technology (POSTECH)

Sweat-collecting patch impressed by cactus spines (2021, November 4)
retrieved 4 November 2021
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