کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10633447 | 993031 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pressure-induced changes on the optical properties and microstructure of silica-gel matrices doped with rhodamine 6G
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Pressure-induced changes on the optical properties and microstructure of silica-gel matrices doped with rhodamine 6G Pressure-induced changes on the optical properties and microstructure of silica-gel matrices doped with rhodamine 6G](/preview/png/10633447.png)
چکیده انگلیسی
Sol-gel method and high-pressure technique were associated to produce silica compacts with low porosity and doped with rhodamine 6G (R6G). Acid catalyzed solutions of tetraethyl orthosilicate mixed with dye previously dissolved in ethanol were used for the synthesis of doped silica gel. The monolith obtained was comminuted and the powder was compacted between 3.0 and 7.7Â GPa, at room temperature, using a toroidal-type high-pressure chamber. Excitation-emission fluorescence spectroscopy was used to investigate the optical properties of R6G embedded in the closed pores of the silica matrix. Measurements of surface areas and pore size distribution for the powders and compacts, using the N2 isotherms were performed, showing a great reduction in surface area and porosity, after compaction. The dye entrapped in the compacted silica maintains its optical properties similar to that in ethanolic solutions, meaning that the dye is dispersed in a molecular level. Additionally, these samples are optically transparent, hard and resistant to dye leaching and to chemical attacks, being a promising material to be used in optical devices.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 27, Issue 12, December 2005, Pages 1819-1824
Journal: Optical Materials - Volume 27, Issue 12, December 2005, Pages 1819-1824
نویسندگان
Tania Maria Haas Costa, Helena Sofia Hoffmann, Edilson Valmir Benvenutti, Valter Stefani, Marcia Russman Gallas,