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Gelification: An Effective Measure for Achieving Differently Sized Biocompatible Fe3O4 Nanocrystals through a Single Preparation Recipe
Jia, Qiaojuan2; Zeng, Jianfeng2; Qjao, Ruirui2; Jing, Lihong2; Peng, Liang1; Gu, Fenglong1; Gao, Mingyuan2
2011-12-07
Source PublicationJOURNAL OF THE AMERICAN CHEMICAL SOCIETY
ISSN0002-7863
Volume133Issue:48Pages:19512-19523
AbstractBiocompatible Fe3O4 nanocrystals were synthesized through the pyrolysis of ferric acetylacetonate (Fe(acac)3) in diphenyl oxide, in the presence of ;a,co-dicarboxyl-terminated polyethylene glycol (HOOC-PEG-COOH) and oleylamine. Unusual gelification phenomena were observed from the aliquots extracted at different reaction stages after they were cooled to room temperature. By reaction time, the average size of the Fe3O4 nanocrystals was tuned from 5.8 to 11.7 nm with an equilibrium size around 11.3 nm. By increasing the gelification degree of the stock solution, the equilibrium size of the Fe3O4 nanocrystals was further increased from 11.3 to 18.9 nm. The underlying gel formation mechanism was investigated by using ultraviolet visible absorption spectroscopy and Fourier transform infrared spectroscopy. The results suggest that the complexation between HOOC-PEG-COOH and Fe(acac)(3), with the help of oleylamine, results in large molecular networks, which are responsible for the gelification of the stock solution, while the interaction between the fragment of the molecular network and Fe3O4 nanocrystal is responsible for the second gelification process observed during the early stage of reflux. To further investigate the particle growth behavior, small molecules released during the preparation were collected and analyzed by using photoelectron spectroscopy/photoionization mass spectroscopy (PES/PIMS). It was demonstrated that the pyrolysis of the Fe precursor is strongly correlated with the particle growth process. Further numerical simulations reveal that the first gelification process induced by the complexation between HOOC-PEG-COOH and Fe(acac)(3) largely alters the pyrolysis behavior of the Fe precursor; consequently, the equilibrium size of the resultant Fe3O4 nanocrystals can effectively be tuned by the gelification degree of the stock solution.
DOI10.1021/ja2081263
Indexed BySCI
Language英语
WOS IDWOS:000297606500044
PublisherAMER CHEMICAL SOC
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/73814
Collection中国科学院化学研究所
Corresponding AuthorGu, Fenglong
Affiliation1.S China Normal Univ, Ctr Computat Quantum Chem, Guangzhou 510631, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Jia, Qiaojuan,Zeng, Jianfeng,Qjao, Ruirui,et al. Gelification: An Effective Measure for Achieving Differently Sized Biocompatible Fe3O4 Nanocrystals through a Single Preparation Recipe[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2011,133(48):19512-19523.
APA Jia, Qiaojuan.,Zeng, Jianfeng.,Qjao, Ruirui.,Jing, Lihong.,Peng, Liang.,...&Gao, Mingyuan.(2011).Gelification: An Effective Measure for Achieving Differently Sized Biocompatible Fe3O4 Nanocrystals through a Single Preparation Recipe.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,133(48),19512-19523.
MLA Jia, Qiaojuan,et al."Gelification: An Effective Measure for Achieving Differently Sized Biocompatible Fe3O4 Nanocrystals through a Single Preparation Recipe".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 133.48(2011):19512-19523.
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