scholarly journals Effect of light units on tooth bleaching with visible-light activating titanium dioxide photocatalyst

2011 ◽  
Vol 30 (5) ◽  
pp. 723-729 ◽  
Author(s):  
Ayaka KISHI ◽  
Masayuki OTSUKI ◽  
Alireza SADR ◽  
Masaomi IKEDA ◽  
Junji TAGAMI
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Tooth Bleaching ◽  
Titanium Dioxide Photocatalyst ◽  
Effect Of Light

Visible light-induced heterogeneous Meerwein–Ponndorf–Verley-type reduction of an aldehyde group over an organically modified titanium dioxide photocatalyst

2017 ◽  
Vol 53 (30) ◽  
pp. 4215-4218 ◽  
Author(s):  
Makoto Fukui ◽  
Atsuhiro Tanaka ◽  
Keiji Hashimoto ◽  
Hiroshi Kominami
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Aldehyde Group ◽  
Light Irradiation ◽  
Benzyl Alcohols ◽  
Type Reduction ◽  
Organically Modified ◽  
Titanium Dioxide Photocatalyst

An organically modified TiO2 photocatalyst chemoselectively converted benzaldehydes to the corresponding benzyl alcohols under visible light irradiation.

scholarly journals Effects of light sources and visible light-activated titanium dioxide photocatalyst on bleaching

2009 ◽  
Vol 28 (6) ◽  
pp. 693-699 ◽  
Author(s):  
Yuji SUYAMA ◽  
Masayuki OTSUKI ◽  
Shinichiro OGISU ◽  
Ryuzo KISHIKAWA ◽  
Junji TAGAMI ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Light Sources ◽  
Titanium Dioxide Photocatalyst

scholarly journals Effect of ultraviolet ray on tooth bleaching using titanium dioxide photocatalyst

2020 ◽  
Vol 20 (2) ◽  
pp. 35-40
Author(s):  
Yukiko Tanno ◽  
Masayuki Otsuki ◽  
Miho Nishimura ◽  
Minh Nguyet Luong ◽  
Tomohiro Takagaki ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Tooth Bleaching ◽  
Titanium Dioxide Photocatalyst ◽  
Ultraviolet Ray

Visible light photodegradation of 4-chlorophenol with a coke-containing titanium dioxide photocatalyst

2001 ◽  
Vol 32 (4) ◽  
pp. 215-227 ◽  
Author(s):  
Christian Lettmann ◽  
Knut Hildenbrand ◽  
Horst Kisch ◽  
W. Macyk ◽  
Wilhelm F. Maier
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Titanium Dioxide Photocatalyst

scholarly journals A dual compartment cuvette system for correcting scattering in whole-cell absorbance spectroscopy of photosynthetic microorganisms

2021 ◽  
Author(s):  
John R. D. Hervey ◽  
Paolo Bombelli ◽  
David J. Lea-Smith ◽  
Alan K. Hulme ◽  
Nathan R. Hulme ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Light Scattering ◽  
Integrating Sphere ◽  
Whole Cell ◽  
Absorbance Spectroscopy ◽  
Dual Beam ◽  
Custom Made ◽  
Size And Morphology ◽  
Micro Organisms ◽  
Effect Of Light

AbstractAbsorption spectroscopy is widely used to determine absorption and transmission spectra of chromophores in solution, in addition to suspensions of particles, including micro-organisms. Light scattering, caused by photons deflected from part or all of the cells or other particles in suspension, results in distortions to the absorption spectra, lost information and poor resolution. A spectrophotometer with an integrating sphere may be used to alleviate this problem. However, these instruments are not universally available in biology laboratories, for reasons such as cost. Here, we describe a novel, rapid, and inexpensive technique that minimises the effect of light scattering when performing whole-cell spectroscopy. This method involves using a custom made dual compartment cuvette containing titanium dioxide in one chamber as a scattering agent. Measurements were conducted of a range of different photosynthetic micro-organisms of varying cell size and morphology, including cyanobacteria, eukaryotic microalgae and a purple non-sulphur bacterium. A concentration of 1 mg ml−1 titanium dioxide, using a spectrophotometer with a slit width of 5 nm, produced spectra for cyanobacteria and microalgae similar (1–4% difference) to those obtained using an integrating sphere. The spectrum > 520 nm was similar to that with an integrating sphere with the purple non-sulphur bacterium. This system produced superior results to those obtained using a recently reported method, the application of the diffusing agent, Scotch™ Magic tape, to the side of the cuvette. The protocol can be completed in an equivalent period of time to standard whole-cell absorbance spectroscopy techniques, and is, in principle, suitable for any dual-beam spectrophotometer.

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