Ultraviolet light screen using cholesteric liquid crystal capsules on the basis of selective reflection

Heemuk Oh; Hirotugu Kikuchi; Ji Hyun Lee; Su Ji Kim; Jun Bae Lee; Moon Sun Cho; Min Young Lee; Yasushi Okumura; Joo Hee Hong; Sung Kyu Hong

doi:10.1039/d1ra03499e

Ultraviolet light screen using cholesteric liquid crystal capsules on the basis of selective reflection

Heemuk Oh, Hirotugu Kikuchi, Ji Hyun Lee, Su Ji Kim, Jun Bae Lee, Moon Sun Cho, Min Young Lee, Yasushi Okumura, Joo Hee Hong, Sung Kyu Hong

Department of Chemical and Biochemical Engineering

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Sunscreen can protect human skin from sunlight by decreasing exposure to ultraviolet (UV) light, specifically UV-B and UV-A. In this study, a new type of UV screen system is proposed using cholesteric liquid crystal (CLC) capable of selectively reflecting UV-A within the human skin temperature range of 32-36 °C. Polycaprolactone (PCL) capsules with CLC mixture which had a helical chiral pitch corresponding to the wavelength of UV light were made by a solvent evaporation method. The average diameter of the capsules was about 34 μm. Consequently, it was confirmed that the CLC mixture (COC : CN = 80 : 20) could reflect UV-A light over 350-380 nm within the human skin temperature range. Also, it was confirmed that the CLC/PCL microcapsules could block UV light over 290-400 nm by about 6%.

Original language	English
Pages (from-to)	25471-25476
Number of pages	6
Journal	RSC Advances
Volume	11
Issue number	41
DOIs	https://doi.org/10.1039/d1ra03499e
State	Published - 6 Jul 2021

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10.1039/d1ra03499e

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title = "Ultraviolet light screen using cholesteric liquid crystal capsules on the basis of selective reflection",

abstract = "Sunscreen can protect human skin from sunlight by decreasing exposure to ultraviolet (UV) light, specifically UV-B and UV-A. In this study, a new type of UV screen system is proposed using cholesteric liquid crystal (CLC) capable of selectively reflecting UV-A within the human skin temperature range of 32-36 °C. Polycaprolactone (PCL) capsules with CLC mixture which had a helical chiral pitch corresponding to the wavelength of UV light were made by a solvent evaporation method. The average diameter of the capsules was about 34 μm. Consequently, it was confirmed that the CLC mixture (COC : CN = 80 : 20) could reflect UV-A light over 350-380 nm within the human skin temperature range. Also, it was confirmed that the CLC/PCL microcapsules could block UV light over 290-400 nm by about 6%.",

author = "Heemuk Oh and Hirotugu Kikuchi and Lee, {Ji Hyun} and Kim, {Su Ji} and Lee, {Jun Bae} and Cho, {Moon Sun} and Lee, {Min Young} and Yasushi Okumura and Hong, {Joo Hee} and Hong, {Sung Kyu}",

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T1 - Ultraviolet light screen using cholesteric liquid crystal capsules on the basis of selective reflection

AU - Oh, Heemuk

AU - Kikuchi, Hirotugu

AU - Lee, Ji Hyun

AU - Kim, Su Ji

AU - Lee, Jun Bae

AU - Cho, Moon Sun

AU - Lee, Min Young

AU - Okumura, Yasushi

AU - Hong, Joo Hee

AU - Hong, Sung Kyu

PY - 2021/7/6

Y1 - 2021/7/6

N2 - Sunscreen can protect human skin from sunlight by decreasing exposure to ultraviolet (UV) light, specifically UV-B and UV-A. In this study, a new type of UV screen system is proposed using cholesteric liquid crystal (CLC) capable of selectively reflecting UV-A within the human skin temperature range of 32-36 °C. Polycaprolactone (PCL) capsules with CLC mixture which had a helical chiral pitch corresponding to the wavelength of UV light were made by a solvent evaporation method. The average diameter of the capsules was about 34 μm. Consequently, it was confirmed that the CLC mixture (COC : CN = 80 : 20) could reflect UV-A light over 350-380 nm within the human skin temperature range. Also, it was confirmed that the CLC/PCL microcapsules could block UV light over 290-400 nm by about 6%.

AB - Sunscreen can protect human skin from sunlight by decreasing exposure to ultraviolet (UV) light, specifically UV-B and UV-A. In this study, a new type of UV screen system is proposed using cholesteric liquid crystal (CLC) capable of selectively reflecting UV-A within the human skin temperature range of 32-36 °C. Polycaprolactone (PCL) capsules with CLC mixture which had a helical chiral pitch corresponding to the wavelength of UV light were made by a solvent evaporation method. The average diameter of the capsules was about 34 μm. Consequently, it was confirmed that the CLC mixture (COC : CN = 80 : 20) could reflect UV-A light over 350-380 nm within the human skin temperature range. Also, it was confirmed that the CLC/PCL microcapsules could block UV light over 290-400 nm by about 6%.

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ER -

Ultraviolet light screen using cholesteric liquid crystal capsules on the basis of selective reflection

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