Effect of calcination temperature on fluorescent adhesives with rare-earth element-containing ZnO nanoparticles

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概要

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• Making orthodontic adhesives visible is valuable for safe and complete removal of these adhesives after completion of orthodontic treatments using a multibracket appliance. In order to make orthodontic adhesives visible by irradiation with purple or near ultraviolet light, trivalent europium ions, which emit clear red fluorescence, were doped into the lattices of zinc oxides by a homogeneous precipitation method and subsequent calcination at 400℃ or 850℃. The primary crystals of the synthesized products, overall, were on the nanoscale. The fluorescence intensity of the ZnO:Eu^<3+> nanoparticle-containing polymer adhesives was somewhat weak. The spectra, independent of the calcination temperatures, exhibited characteristic peaks corresponding to the intrinsic 4f-4f transitions of Eu^<3+>. However, it is evident from the X-ray diffraction (XRD) patterns that the 850℃-calcination tended to crystallize more EU_2O_3, along with increased incorporation of Eu^<3+> ions into ZnO lattices, in comparison to the case with the 400℃-calcination. In addition, although the yielding load of the adhesives containing nanoparticles calcined at 850℃ decreased significantly, the decrease in the actual measured values was quite limited in both the cases. From a comprehensive standpoint, although the ZnO:Eu^<3+> nanoparticles calcined at 850℃ exhibited acceptable fluorescence intensity, the calcination at 400℃ is preferred for application to orthodontic adhesives.

• 北海道矯正歯科学会の論文
• 2012-12-25

著者

• Iida Junichiro

  Department Of Oral Functional Science (section Of Orthodontics) Graduate School Of Dental Medicine H

• Yamagata Shuichi

  Department Of Orthodontics School Of Dentistry Hokkaido University

• Yamamoto Takaaki

  Department Of Oral Functional Science Graduate School Of Dental Medicine Hokkaido University

• Sato Yoshiaki

  Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan

• Sato Yoshiaki

  Department of Orthodontics, Graduate School of Dental Medicine, Hokkaido University

• Yamagata Shuichi

  Department of Orthodontics, Graduate School of Dental Medicine, Hokkaido University

• Hanba Yusuke

  Department of Orthodontics, Graduate School of Dental Medicine, Hokkaido University

• Nakanishi Ko

  Department of Orthodontics, Graduate School of Dental Medicine, Hokkaido University

• Yamamoto Takaaki

  Department of Orthodontics, Graduate School of Dental Medicine, Hokkaido University

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