UV-absorption and thermal properties of Pb-doped glymo/damo-derived coating materials prepared by sol–gel process

Autor: Funda Sayılkan, M. G. İçduygu, Meltem Asiltürk, Hikmet Sayılkan
Rok vydání: 2005
Předmět:
Zdroj: Journal of Materials Science. 40:5779-5782
ISSN: 1573-4803
0022-2461
DOI: 10.1007/s10853-005-4563-2
Popis: Organically modified silanes referred to as ORMOSILS are new type of organic–inorganic hybrids, in which the inorganic backbone can be formed by a low-temperature process and organic groups can be modified easily by sol–gel process. These hybrid materials were proposed more than 20 years ago by Philips and Schmidt [1] and have been intensively developed during the last few years, especially for optical applications [2–5]. Ordinary glass transmits an important part of UV light (such as UVB at 280–320 nm and UVA at 320–400 nm) which is dangerous to man [6]. Transition-metal salts added to starting solution provide an inorganic network containing metal ions and entrapment of these ions are very effective for decreasing the transmission property of the glass in these wavelength regions [7, 8]. In this work, a new glass coating composition containing γ -glycidyloxypropyltrimethoxysilane (GLYMO)/3(2-aminoethylamino)propyltrimethoxysilane (DAMO)/lead(II)nitrate was prepared by sol–gel process. After coating an ordinary glass with this coating system, lower transmissions were obtained in the UV regions. GLYMO/Pb (1/0.1 and 1/0.01 mol/mol) compositions were also examined, but gelation occurred after addition 0.1 mol of Pb into GLYMO solution. When Pb2+ was decreased to 0.01 mol, gelation was not observed, but UV adsorption of this coating was not different from uncoated glass until thermal treatment up to 350 ◦C. Therefore, GLYMO/DAMO/Pb composition was selected as coating material for glasses and the coated glasses were thermally treated up to 500 ◦C. GLYMO, DAMO and lead nitrate were used as they were received. The coating compositions were prepared from hydrolyzed GLYMO (H2O/GLYMO:3, mol/mol), DAMO (H2O/DAMO:3, mol/mol) and lead nitrate solution (GLYMO:DAMO:Pb: 1:1:0.1, 1:1:0.01, 1:0.5:0.1 and 1:0.5:0.01, mol/mol) and they are referred hereafter as GDP0.1 and GDP0.01, GD0.5P0.1 and GD0.5P0.01.
Databáze: OpenAIRE
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