scholarly journals Spectrum of virucidal activity from ultraviolet to infrared radiation

2020 ◽  
Vol 19 (10) ◽  
pp. 1262-1270 ◽  
Author(s):  
Luke Horton ◽  
Angeli Eloise Torres ◽  
Shanthi Narla ◽  
Alexis B. Lyons ◽  
Indermeet Kohli ◽  
...  
Keyword(s):  
Visible Light ◽  
Infrared Radiation ◽  
Ultraviolet B ◽  
Virucidal Activity ◽  
Ultraviolet A

There is evidence that other wavelengths beyond the traditional germicidal 254 nm UVC – namely far UVC (222 nm), ultraviolet B, ultraviolet A, visible light, and infrared radiation – have germicidal properties; however, data on UVC is the most robust.

scholarly journals Rescue Blankets-Transmission and Reflectivity of Electromagnetic Radiation

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 375 ◽  
Author(s):  
Hannah Kranebitter ◽  
Bernd Wallner ◽  
Andreas Klinger ◽  
Markus Isser ◽  
Franz J. Wiedermann ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Visible Light ◽  
Heat Loss ◽  
Infrared Radiation ◽  
Experimental Studies ◽  
High Energy ◽  
Ultraviolet B ◽  
Electromagnetic Spectrum ◽  
Blue Band ◽  
Outdoor Sports

Rescue blankets are medical devices made of a polyethylene terephthalate sheet coated with a thin aluminum layer. Blankets are used for protection against hypothermia in prehospital emergency medicine and outdoor sports, but totally different qualities are typical for these multi-functional tools. On the one hand, rescue sheets prevent hypothermia by reducing thermo-convection and diminishing heat loss from evaporation and thermal radiation. On the other hand, the sheets promote cooling by acting as a radiant barrier, by providing shade and even by increasing heat conduction when the sheet is in direct contact with the skin. As foils are watertight and windproof, they can function as vapor barriers and even as stopgap bivouac sacks. We evaluated three experimental studies, one on heat loss by rescue blankets according to surface color, one on transparency with ultraviolet radiation, high-energy visible light and visible light, and one on infrared radiation from rescue blankets. When evaluating the effects of different bands of the electromagnetic spectrum on rescue sheets, we focused on ultraviolet radiation (200–380 nm), high-energy visible light in the violet/blue band (380–450 nm), visible light (380–760 nm) and infrared radiation (7500–13,500 nm). Rescue sheets transmit between 1% and 8% of visible light and about 1% of ultraviolet B radiation (280–315 nm), providing sufficient transparency and adequate protection from snow blindness. Reflection of visible light increases detectability in search and rescue missions performed in good visibility conditions, while reflection of infrared radiation increases detectability in poor visibility conditions and provides protection against hypothermia.

scholarly journals Photostability of TiO2-Coated Wool Fibers Exposed to Ultraviolet B, Ultraviolet A, and Visible Light Irradiation

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Qi Tang ◽  
Hui Zhang ◽  
Ye Han ◽  
Dou Wang ◽  
Hailiang Wu
Keyword(s):  
Thermal Stability ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
High Intensity ◽  
Ultraviolet B ◽  
Light Irradiation ◽  
Ultraviolet A ◽  
Orientation Degree ◽  
X Ray ◽  
Wool Fibers

Abstract This study is to investigate the role of the coating of TiO2 nanoparticles deposited on wool fibers against high-intensity ultraviolet B (UVB), ultraviolet A (UVA), and visible light irradiation. The properties of tensile and yellowness and whiteness indices of irradiated TiO2-coated wool fibers are measured. The changes of TiO2-coated wool fibers in optical property, thermal stability, surface morphology, composition, molecular structure, crystallinity, and orientation degree are characterized using diffuse reflectance spectroscopy, thermogravimetric analysis, scanning electronic microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, and X-ray diffraction techniques. Experimental results show that the tensile properties of anatase TiO2-coated wool fibers can be degraded under the high-intensity UVB, UVA, and visible light irradiation for a certain time, resulting in the loss of the postyield region of stress–strain curve for wool fibers. The coating of TiO2 nanoparticles makes a certain contribution to the tensile property, yellowness and whiteness indices, thermal stability, and surface morphology of wool fibers against high-intensity UVB, UVA, and visible light irradiation. The high-intensity UVB, UVA, and visible light can result in the photo-oxidation deterioration of the secondary structure of TiO2-coated wool fibers to a more or less degree. Meanwhile, the crystallinity and orientation degree of TiO2 coated wool fibers decrease too.

The Synthesis of Titanium Dioxide Emulsion as UV Blocking

2010 ◽  
Vol 93-94 ◽  
pp. 635-638 ◽  
Author(s):  
Thammarat Panyatanmaporn ◽  
Jittiporn Kruenate ◽  
Chuanchom Aumnate ◽  
Thammarak Sooksomsong
Keyword(s):  
Visible Light ◽  
Amorphous Phase ◽  
Ultraviolet B ◽  
Light Transmittance ◽  
Visible Range ◽  
Ultraviolet A ◽  
Emulsion Method ◽  
Infrared Rays ◽  
Absorbing Materials ◽  
Uv Absorbers

The solar light consists of ultraviolet, visible and infrared ray. The ultraviolet and infrared rays, unlike visible ray, are not benefit to photosynthesis. Inorganic ultraviolet absorbing materials are mostly in crystallised phase such as TiO2, ZnO and CeO2 which caused lower transmittion in visible range. As known that, the commercial organic UV absorbers can absorb only the appointed UV wavelength. TiO2 emulsion for ultraviolet blocking was synthesized in this project in order to overcome such poor transmittion behavior. The preparative TiO2 emulsion can absorb UV completely without interfering the visible light transmittance. This is because the synthesized TiO2 via emulsion method was mainly an amorphous phase. The obtained composite film containing amorphous phase of TiO2 shows 80-90% transmittance of the visible light, 20-70% absorbance of ultraviolet A and 70-95 % absorbance of ultraviolet B.

scholarly journals Upconversion of Broadband Infrared Radiation into Visible Light for Different Pumping Parameters

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Man Nen Litvinova ◽  
Victor Krishtop ◽  
Evgeniy Tolstov ◽  
Vladimir Troilin ◽  
Larisa Alekseeva ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Visible Light ◽  
Light Beam ◽  
Infrared Radiation ◽  
Spectral Width ◽  
Uniaxial Crystal ◽  
Phase Matching ◽  
Pump Radiation ◽  
Broadband Radiation ◽  
Lithium Niobate Crystals

The influence of pump radiation parameters such as the polarization and the spectral width of infrared radiation on the conversion of broadband radiation in lithium niobate crystals was investigated. The spectra of converted radiation were calculated for two types of phase matching in the negative uniaxial crystal by taking into account the convergence of the light beam in the crystal. Experimental spectra were obtained and compared with the calculated spectra.

scholarly journals Melanoma induction by ultraviolet A but not ultraviolet B radiation requires melanin pigment

2012 ◽  
Vol 3 (1) ◽  
Author(s):  
Frances P. Noonan ◽  
M. Raza Zaidi ◽  
Agnieszka Wolnicka-Glubisz ◽  
Miriam R. Anver ◽  
Jesse Bahn ◽  
...  
Keyword(s):  
Ultraviolet B ◽  
Melanin Pigment ◽  
Ultraviolet A ◽  
Ultraviolet B Radiation

Visible light accelerates the ultraviolet A‐induced degradation of eumelanin and pheomelanin

2018 ◽  
Vol 32 (3) ◽  
pp. 441-447 ◽  
Author(s):  
Shosuke Ito ◽  
Ludger Kolbe ◽  
Gudrun Weets ◽  
Kazumasa Wakamatsu
Keyword(s):  
Visible Light ◽  
Ultraviolet A
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