Synthesis of PTSH-modified CeO₂ nanoparticles: Effect of the modifier on structure, optical properties, and dispersibility

详细信息    查看全文

• 作者：Laurianne Truffault^a ; ^{laurianne.truffault@gmail.com} ; Caroline Andrezza^b ; ^{caroline.andreazza@univ-orleans.fr} ; Celso Valentim Santilli^a ; ^{santilli@iq.unesp.br} ; Sandra Helena Pulcinelli^a ; ^{sandrap@iq.unesp.br}
• 关键词：CeO2 nanoparticles ; Surface modification ; Dispersibility
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2013
• 出版时间：5 June, 2013
• 年：2013
• 卷：426
• 期：Complete
• 页码：63-69
• 全文大小：1295 K

文摘

CeO₂ nanoparticles were synthesized by the precipitation method and modified with para-toluene sulfonic acid (PTSH), either in situ or post-synthesis. The presence of PTSH in the samples was confirmed by FTIR. PXRD and FTIR analyses showed that the post-synthesis PTSH modification altered the CeO₂ structure, whereas the in situ modification maintained intact the crystalline structure and UV-vis absorbance properties. For both in situ and post-synthesis modifications, TEM images revealed the presence of nanoparticles that were 5 nm in size. The dispersibility of the in situ PTSH-modified material in a hydrophilic ureasil-poly(ethylene oxide) matrix was investigated using SAXS measurements, which indicated that CeO₂ nanoparticles modified with PTSH in situ were less aggregated within the matrix, compared to unmodified CeO₂ nanoparticles.