Sökning: WFRF:(Niklasson Gunnar A.) > Optics of sunscreen...
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000 | 03622nam a2200349 4500 | |
001 | oai:DiVA.org:uu-492315 | |
003 | SwePub | |
008 | 230103| | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4923152 URI |
040 | a (SwePub)uu | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a vet2 swepub-contenttype |
072 | 7 | a ovr2 swepub-publicationtype |
100 | 1 | a Niklasson, Gunnar A.,d 1953-u Uppsala universitet,Fasta tillståndets fysik4 aut0 (Swepub:uu)gni26208 |
245 | 1 0 | a Optics of sunscreen lotions :b Preliminary results on scattering and absorption coefficients |
338 | a print2 rdacarrier | |
520 | a Sunscreen lotions are used to protect the skin from damage due to solar ultraviolet (UV) radiation. The active UV-blocking components can be organic molecules or inorganic particles, for example TiO2. While both in-vivo and in-vitro methods exist for assessing the protective capacity of sunscreens, their basic optical properties have received little attention. In this paper we take the first steps to address this issue by presenting a method to obtain spectra of absorption and scattering coefficients of a sunscreen by analysis of experimental transmittance and reflectance spectra. We model the optical properties of the sunscreen by two-flux theory, develop approximate expressions for interface reflection coefficients and obtain the remaining optical parameters by fitting the two-flux theory to measurements. We analyze spectrophotometric reflectance and transmittance spectra of experimental narrow band UV blocking materials based on mesoporous magnesium carbonate – TiO2 mixtures, as well as some commercial sunscreens. Our method is demonstrated in vitro using quartz substrates and is further used to model in vivo measurements on the upside of the hand of one of the authors. The obtained absorption and scattering coefficient spectra give information on the relative contributions of these processes to the UV-blocking effect as well as the scattering of visible light responsible for the whitening of the skin upon application of a sunscreen lotion. Our analysis method may be useful for computational optimization of novel sunscreen formulations as well as for the development of in-vivo test methods. | |
650 | 7 | a NATURVETENSKAPx Fysikx Den kondenserade materiens fysik0 (SwePub)103042 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Condensed Matter Physics0 (SwePub)103042 hsv//eng |
650 | 7 | a NATURVETENSKAPx Fysikx Atom- och molekylfysik och optik0 (SwePub)103022 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Atom and Molecular Physics and Optics0 (SwePub)103022 hsv//eng |
653 | a Engineering Science with specialization in Solid State Physics | |
653 | a Teknisk fysik med inriktning mot fasta tillståndets fysik | |
700 | 1 | a Niklasson, Sara L.u Uppsala universitet,Fasta tillståndets fysik4 aut |
700 | 1 | a Notfors, Celinau Uppsala universitet,Nanoteknologi och funktionella material4 aut |
700 | 1 | a Wang, JunXinu Uppsala universitet,Fasta tillståndets fysik4 aut0 (Swepub:uu)junwa286 |
700 | 1 | a Strømme, Maria,d 1970-u Uppsala universitet,Nanoteknologi och funktionella material4 aut0 (Swepub:uu)mst26208 |
700 | 1 | a Århammar, Ceciliau Uppsala universitet,Nanoteknologi och funktionella material,Disruptive Materials AB, Uppsala4 aut0 (Swepub:uu)cearh254 |
710 | 2 | a Uppsala universitetb Fasta tillståndets fysik4 org |
856 | 4 | u https://doi.org/10.48550/arXiv.2204.13507y Pre-print i arXiv |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-492315 |
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