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

8 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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year = "2021",

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doi = "10.1039/d1ra03499e",

language = "English",

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TY - JOUR

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%.

UR - https://www.scopus.com/pages/publications/85111568999

U2 - 10.1039/d1ra03499e

DO - 10.1039/d1ra03499e

M3 - Article

AN - SCOPUS:85111568999

SN - 2046-2069

VL - 11

SP - 25471

EP - 25476

JO - RSC Advances

JF - RSC Advances

IS - 41

ER -

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

Abstract

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