In Situ Monitoring of the Nucleation of Polyaniline Nanoparticles from Sodium Dodecyl Sulfate Micelles:A Nuclear Magnetic Resonance Study
A complete mechanistic study on the nucleation of polymeric nanopartides covering the generation of the dusters and the forthcoming aggregation to the nuclei is performed by in situ 1H nuclear magnetic resonance (NMR) experiments using polyaniline as an example.An aniline tetramer and a monomer-stabilized nitrenium are proved to be the basic duster and predominant propagating intermediate in the nucleation.It is observed that the nuclei are generated via a sequential mechanism involving a translocation of the protonated tetramers to the aqueous bulk, dissociation of sodium dodecyl sulfate (SDS) micelles, and deprotonation to induce the fusion of the dissodated micelles and intermolecular packing of the oligomers.Despite its importance, direct observation of the nucleation is challenging.This work emphasizes the importance of utilizing the solvent in solvation shell as the sensitive probe to explore the most transient process in nucleation, demonstrating its efficiency in achieving information such as the stepwise procedures, the nudei sizes, the growth kinetics, and so forth.The approach reported herein may prove of great value in establishing the missing link of the atomic origin of nanopartides, a key topic toward the preparation of functional nanostructures with well-controlled architectures, and can be readily extended to the study of other organic or inorganic systems.
Xiaodong Wu Kong Liu Lude Lu Qiaofeng Han Fengli Bei Xujie Yang Xin Wang Qiong Wu Weihua Zhu
Key Laboratory for Soft Chemistry and Functional Materials, Nanjing University of Science and Techno Institute for Computation in Molecular and Materials Science and Department of Chemistry, Nanjing Un
国内会议
苏州
英文
134-141
2013-10-25（万方平台首次上网日期，不代表论文的发表时间）