Artificial Sweat Glands Based on Nanoclays and Thermoresponsive Hydrogels

Lee, CheongCheon; Lee, Jonghwi

doi:10.1166/sam.2017.3030

Cited by 1 publication

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8 Research on artificial sweating systems has often involved the use of a poly(N-isopropylacrylamide) (PNIPAm) hydrogel because it is a cheap temperature-responsive material. 1,3,4 PNIPAm undergoes a volume transition at its lower critical solution temperature (LCST), which is near the human body temperature, and releases water above the LCST. 10−13 In a previous study, the PNIPAm hydrogel was used as a cooling material on a hot surface, and its cooling effect was compared with that of a nonthermosensitive hydrogel.…”

Section: Introductionmentioning

confidence: 99%

“…Mammals are the only organisms that possess sweat glands, , which are located in the skin. Sweat glands comprise a secretory coil and a duct through which the secretory product passes.…”

Section: Introductionmentioning

confidence: 99%

“…Several efforts have been devoted toward applying the sweating mechanism in mammals to cooling systems in buildings, plants, and devices. ,− For artificial sweating systems, energy conversion is not required, and the energy density of water evaporation is relatively large (approximately 2 MJ/kg). , In contrast, although there have been many attempts to improve the efficiency of artificial cooling systems such as refrigerators and air conditioners, intrinsic efficiency limitations in energy conversion still exist . Research on artificial sweating systems has often involved the use of a poly( N -isopropylacrylamide) (PNIPAm) hydrogel because it is a cheap temperature-responsive material. ,, PNIPAm undergoes a volume transition at its lower critical solution temperature (LCST), which is near the human body temperature, and releases water above the LCST. − In a previous study, the PNIPAm hydrogel was used as a cooling material on a hot surface, and its cooling effect was compared with that of a nonthermosensitive hydrogel . It was found that the PNIPAm hydrogel exhibited a superior cooling effect; however, this cooling effect could only be achieved when the hydrogel was fully swollen.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temperature-Responsive On–Off Control over Water Evaporation Achieved via Sweat-Gland-Mimetic Composites

Lee

Kang

Seo

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Responsive cooling materials that mimic sweat glands have gained popularity because they are efficient and do not require artificial energy sources. Temperature-responsive hydrogels sweat above their volume transition temperature through the release of water and exhibit excellent cooling ability. However, thus far, practical applications have not been possible because the water in these materials cannot be preserved in cool environments. To address this issue, this paper presents a simple composite of poly(N-isopropylacrylamide) and polydimethylsiloxane that offers excellent on−off control over water evaporation and can be used repeatedly; the proposed composite features an evaporation rate of 2.97 g/h above the lower critical solution temperature (LCST) and 0.08 g/h below the LCST. This 35.7-fold change in the water evaporation rate is comparable to that in mammalian sweat glands. The responsive on−off control relies on the structures of the composite and the dry layers formed on the surface of the composite in cool environments. The proposed material effectively regulates water evaporation and offers a novel, low-cost cooling strategy suitable for numerous applications.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Mammals are the only organisms that possess sweat glands, , which are located in the skin. Sweat glands comprise a secretory coil and a duct through which the secretory product passes.…”

Section: Introductionmentioning

confidence: 99%