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Thermal and Structural Analyses of PMMA/TiO2Nanoparticles Composites 认领 引用 被引量：3
1
作者 Nabawia A. El-Zaher Mohamed S. Melegy Osiris W. Guirguis 《Natural Science》 2014年第11期859-870,共12页
In the present work, composites of poly (methyl methacrylate)itanium oxide nanoparticles (100/0, 97.5/2.5, 95/5, 92.5/7.5, 90/10 and 0/100 wt/wt%)were prepared to be used as bioequivalent materials according to their ... In the present work, composites of poly (methyl methacrylate)itanium oxide nanoparticles (100/0, 97.5/2.5, 95/5, 92.5/7.5, 90/10 and 0/100 wt/wt%)were prepared to be used as bioequivalent materials according to their importance broad practical and medical applications. Thermal properties as well as X-ray diffraction analyses were employed to characterize the structure properties of such composite. The obtained results showed variations in the glass transition temperature (Tg), the melting temperature (Tm), shape and area of thermal peaks which were attributed to the different degrees of crystallinity and the existence of interactions between PMMA and TiO2 nanoparticle molecules. The XRD patterns showed sharpening of peaks at different concentrations of nano-TiO2 powder with PMMA. This indicated changes in the crystallinity/amorphosity ratio, and also suggested that the miscibility between the amorphous components of homo- polymers PMMA and nano-TiO2 powder is possible.The results showed that nano-TiO2 powder mix with PMMA can improve the thermal stability of the homo-polymer under investigation, lead- ing to interesting technological applications. 展开更多
关键词 Poly(methyl methacrylate) Nano-Titanium Dioxide Powder PMMA/TiO2 Nanoparticle Composites Differential Scanning Calorimetry (DSC) Thermogravimetric Analysis (TGA) X-Ray Diffraction (XRD)
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Investigation on composite Au/TiO_2 nanoparticles (Ⅰ)——Synthesis and characterization 认领 引用 被引量：1
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作者 WANG Chuanyi, LIU Chunyan and SHEN Tao Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing 100101, China 《Chinese Science Bulletin》 1998年第3期210-213,共4页
Nanometer sized Au/TiO\-2 particles were synthesized by irradiation of a HAuCl\-4 solution containing colloidal TiO\-2 with light of wavelength (λ)>330 nm. The absorption maximum attributed to the surface plasmon ... Nanometer sized Au/TiO\-2 particles were synthesized by irradiation of a HAuCl\-4 solution containing colloidal TiO\-2 with light of wavelength (λ)>330 nm. The absorption maximum attributed to the surface plasmon band of gold was observed at 540 nm, a red shift of about 20 nm from the position in aqueous solution. The Au clusters are situated on the surface of TiO\-2 in terms of microcrystallite, which was confirmed by HRTEM, EDS and XRD. The electronic interfaction between the metal and the suport was discussed. 展开更多
关键词 photocatalytic reduction composite Au/TiO\-2 nanoparticles surface plasmon band.
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