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Innovative Inorganic Nanoparticles with Antibacterial Properties Attached to Textiles by Sonochemistry
Published in Claudia Altavilla, Enrico Ciliberto, Inorganic Nanoparticles: Synthesis, Applications, and Perspectives, 2017
Perkas Nina, Gedanken Aharon, Wehrschuetz-Sigl Eva, Guebitz Georg M., Perelshtein Ilana, Applerot Guy
Kangwansupamonkon et al. (2009) have reported on the antibacterial performance of apatite-coated TiO2, which was fixed on cotton textiles by a dip-coating technique. Their study indicated that the photocatalytic activity of an apatite-coated TiO2 suspension can help in microbial decomposition in textile applications. Its effectiveness was clearly confirmed against S. aureus, E. coli ATCC 25922, MRSA DMST 20627, and M. luteus strains of bacteria. The effect of an irradiation source on the antimicrobial activity of cotton fabrics coated with apatite-coated TiO2 was examined. The highest antibacterial activity was found from black-light irradiation compared with visible light and dark conditions. This could be explained by the presence of more ROS on the surface of TiO2 particles after irradiation with black light (at wavelengths < 385 nm), whereas the amount of ROS with visible light and dark condition would be less pronounced.
Incoherent Light Sources
Published in Daniel Malacara-Hernández, Brian J. Thompson, Advanced Optical Instruments and Techniques, 2017
Germicidal lamps are lamps with the same construction as any fluorescent lamp except that they have no fluorescent phosphor. This kind of lamp does not have high luminance since most (~ 95%) of the radiated energy is at the UV line of 253.7 nm. This radiation is harmful, since it produces burning to the eyes and skin. These lamps are used for air and liquid disinfection, lithography, and EPROM erasure. The so-called black light lamp has a phosphor that emits UV radiation at the UV-A band (350–400 nm) and peaks at 370 nm. Two versions are available for these lamps: unfiltered lamps with a white phosphor that emits a strong blue component and a filtered one, with a filter to block most of the visible part. Uses for these lamps are found in theatrical scenery lighting, counterfeit money detection, stamp examination, insect traps, fluorescence observing in color inspection boots, and mineralogy. These lamps are manufactured in tubular form, from T5 to T12, compact fluorescent lamps, and a high-intensity discharge lamp.
Introduction to Optical, Infrared, and Terahertz Frequency Bands
Published in Song Sun, Wei Tan, Su-Huai Wei, Emergent Micro- and Nanomaterials for Optical, Infrared, and Terahertz Applications, 2023
Song Sun, Wei Tan, Su-Huai Wei
Besides hot planets, various artificial UV sources are developed including lamps, light-emitting diodes (LED) and lasers [5]. There are several kinds of lamps that could emit UV radiations. The first type is called black light or Wood’s lamp, which produces long wave UV radiation based on either fluorescent or incandescent mechanism. Black light is commonly used in the situation where no visible light is needed, for instance, to trace fluorescence-tagged biochemical substance or to detect counterfeit money. The second type is the short-wave UV lamp, which typically emits short-wave UV-C light with peaks at 253.7 nm and 185 nm due to the mercury vapor filled within the lamp. These short-wave UV lamps are extensively utilized for disinfection purpose (also named germicidal lamps) in biomedical, food and water industries. The third type is the gas-discharge lamp, which could empower flexible UV radiation at various spectral lines depending on the gas types containing in the tube. The most commonly used gas-discharge lamps are neon lamp, deuterium arc lamp, xenon arc lamp, and mercury-xenon arc lamp, which cover the whole UV-A/UV-B/UV-C bands. The fourth type is the metal-halide lamp offering a high intensity white radiation via a mixture of gaseous mercury and metal halide (e.g., sodium iodide), since the metal ion could disassociate from the halide compound during the operation and produce additional emission power. Lastly, excimer lamp is a quasi-monochromatic UV source originated from the spontaneous emission of excimer molecules, which spans over a wide range of UV spectra depending on the molecule types [6].
Mitigation of the inhibitory effects of co-existing substances on the Fenton process by UV light irradiation
Published in Journal of Environmental Science and Health, Part A, 2020
Kosuke Muramatsu, Masahiro Tokumura, Qi Wang, Yuichi Miyake, Takashi Amagai, Masakazu Makino
Three 4-W blacklight-blue lamps (maximum irradiation wavelength = 352 nm) (TOSHIBA, Tokyo, Japan) were used as the excitation light source, and an OPwave (Ocean Photonics, Tokyo, Japan) was used to measure the fluorescence intensity of 7-hydroxycoumarin. The Fenton reagents (iron ions and hydrogen peroxide) were added to a 1-mM coumarin solution (pH = 3.0) in a 200-mL beaker, and the sample was withdrawn after 5 min. Phosphate buffer (pH = 7.4) was added to the sample to quench any unintentional reaction during the analysis and to improve the fluorescence intensity of 7-hydroxycoumarin.[36,39] The sample was then filtered through a membrane filter (pore diameter = 0.45 μm), and the fluorescence intensity of the filtrate was measured.
Synthesis and photophysical properties of conjugated thioketone, thioketone S-oxide (Sulfine), and related compounds incorporated in a dibenzobarrelene skeleton
Published in Journal of Sulfur Chemistry, 2020
Akihiko Ishii, Ryota Ebina, Mari Shibata, Yuki Hayashi, Norio Nakata
All melting points were determined on a Mel-Temp capillary tube apparatus and were uncorrected. 1H and 13C NMR spectra were recorded on Bruker AVANCE-400 (400 MHz for 1H and 101 MHz for 13C) or AVANCE-500 (500 MHz for 1H) spectrometers using CDCl3 as the solvent at room temperature. UV-Vis spectra were recorded on a HITACHI U-1900 spectrophotometer. Fluorescence spectra were recorded on a JASCO FP-6600 spectrofluorometer. Absolute photoluminescence quantum yields were measured by a calibrated integrating sphere system C10027 (Hamamatsu Photonics K.K.). Emission lifetimes were obtained with a Hamamatsu Photonics K.K. Quantaurus-Tau fluorescence lifetime spectrometer. Elemental analyses were carried out at the Molecular Analysis and Life Science Center of Saitama University. X-ray crystallography was performed with a Bruker AXS SMART diffractometer. Solvents were dried by standard methods and freshly distilled prior to use. Column chromatography was performed with silica gel (70-230 mesh) and the eluent is shown in parentheses. All theoretical calculations were performed with the Gaussian 09 package [54]. Photoisomerization between (Z)-10 and (E)-10 was carried out with a light generated from a blacklight blue lamp (FLP27BLB, Sankyo Denki Co., Ltd.); the light centered at 365 nm was filtered with a yellow cellophane to reduce the intensity to less than 1%.