Abstract
Disposal of used optical disks is an urgent requirement for electronic industries. We propose a decomposition system of polycarbonates (PC) (used as substrate materials for optical disks) that utilizes thermally-excited holes at high temperatures. The present system is based on an oxide semiconductor (TiO{sub 2}) heated at about 500 deg. C in combination with a molten state of PC. Molten PC chains are first adsorbed on the surface of TiO{sub 2} due to electrostatic interactions between positively charged oxygen vacancies in TiO{sub 2} and the polar carbonyl group of PC: O{sup ..}{center_dot}{center_dot}{center_dot}O{sup {delta}}{sup -}=C{sup {delta}}{sup +}. Adsorbed PC is then oxidized by thermally-excited holes in TiO{sub 2} and decomposed into small fragments, followed by their combustion in the presence of oxygen to give solely H{sub 2}O and CO{sub 2}. The decomposition mechanism has been discussed on the basis of nonstoichiometric properties of TiO{sub 2} at high temperatures together with adsorption behavior of PC on the surface of TiO{sub 2}.
Mizuguchi, Jin;
Shinbara, Toshihiro
[1]
- Department of Applied Physics, Graduate School of Engineering, Yokohama National University, 240-8501 Yokohama (Japan)
Citation Formats
Mizuguchi, Jin, and Shinbara, Toshihiro.
Disposal of used optical disks utilizing thermally-excited holes in titanium dioxide at high temperatures: A complete decomposition of polycarbonate.
United States: N. p.,
2004.
Web.
doi:10.1063/1.1784553.
Mizuguchi, Jin, & Shinbara, Toshihiro.
Disposal of used optical disks utilizing thermally-excited holes in titanium dioxide at high temperatures: A complete decomposition of polycarbonate.
United States.
https://doi.org/10.1063/1.1784553
Mizuguchi, Jin, and Shinbara, Toshihiro.
2004.
"Disposal of used optical disks utilizing thermally-excited holes in titanium dioxide at high temperatures: A complete decomposition of polycarbonate."
United States.
https://doi.org/10.1063/1.1784553.
@misc{etde_20619157,
title = {Disposal of used optical disks utilizing thermally-excited holes in titanium dioxide at high temperatures: A complete decomposition of polycarbonate}
author = {Mizuguchi, Jin, and Shinbara, Toshihiro}
abstractNote = {Disposal of used optical disks is an urgent requirement for electronic industries. We propose a decomposition system of polycarbonates (PC) (used as substrate materials for optical disks) that utilizes thermally-excited holes at high temperatures. The present system is based on an oxide semiconductor (TiO{sub 2}) heated at about 500 deg. C in combination with a molten state of PC. Molten PC chains are first adsorbed on the surface of TiO{sub 2} due to electrostatic interactions between positively charged oxygen vacancies in TiO{sub 2} and the polar carbonyl group of PC: O{sup ..}{center_dot}{center_dot}{center_dot}O{sup {delta}}{sup -}=C{sup {delta}}{sup +}. Adsorbed PC is then oxidized by thermally-excited holes in TiO{sub 2} and decomposed into small fragments, followed by their combustion in the presence of oxygen to give solely H{sub 2}O and CO{sub 2}. The decomposition mechanism has been discussed on the basis of nonstoichiometric properties of TiO{sub 2} at high temperatures together with adsorption behavior of PC on the surface of TiO{sub 2}.}
doi = {10.1063/1.1784553}
journal = []
issue = {6}
volume = {96}
journal type = {AC}
place = {United States}
year = {2004}
month = {Sep}
}
title = {Disposal of used optical disks utilizing thermally-excited holes in titanium dioxide at high temperatures: A complete decomposition of polycarbonate}
author = {Mizuguchi, Jin, and Shinbara, Toshihiro}
abstractNote = {Disposal of used optical disks is an urgent requirement for electronic industries. We propose a decomposition system of polycarbonates (PC) (used as substrate materials for optical disks) that utilizes thermally-excited holes at high temperatures. The present system is based on an oxide semiconductor (TiO{sub 2}) heated at about 500 deg. C in combination with a molten state of PC. Molten PC chains are first adsorbed on the surface of TiO{sub 2} due to electrostatic interactions between positively charged oxygen vacancies in TiO{sub 2} and the polar carbonyl group of PC: O{sup ..}{center_dot}{center_dot}{center_dot}O{sup {delta}}{sup -}=C{sup {delta}}{sup +}. Adsorbed PC is then oxidized by thermally-excited holes in TiO{sub 2} and decomposed into small fragments, followed by their combustion in the presence of oxygen to give solely H{sub 2}O and CO{sub 2}. The decomposition mechanism has been discussed on the basis of nonstoichiometric properties of TiO{sub 2} at high temperatures together with adsorption behavior of PC on the surface of TiO{sub 2}.}
doi = {10.1063/1.1784553}
journal = []
issue = {6}
volume = {96}
journal type = {AC}
place = {United States}
year = {2004}
month = {Sep}
}