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Optically Active Spherical Polyelectrolyte Brushes with a Nanocrystalline Magnetic Core

机译：具有纳米晶磁芯的光学活性球形聚电解质电刷

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摘要

The unique properties of magnetic nanocrystals have triggered intensive research towards their effective functionalization and application in many technological fields. Although synthesis of magnetic colloids is being thoroughly studied, there is limited knowledge on the synthesis, characterization, and properties of magnetic polyelectrolyte spherical brushes. In the present work, the preparation of such hybrids and the subsequent formation of stable aqueous colloids are described. The core of the spherical brush consists of a magnetic γ-Fe_2O_3 nanocrystallite (faceted but mostly spherical-like) with a mean diameter of 17 nm. The bioadhesive polyelectrolyte poly(sodium 4-styrene sulfonate), forming the surrounding brush layer, was proven to be an effective covalently modifying macromolecule for the iron oxide surface, as Fourier transform IR spectroscopy revealed. Several observations on colloidal aspects are discussed and are successfully explained by models and experiments describing polyelectrolyte brushes with a soft polymeric core. Finally, the hybrids exhibit their multifunctional character and their technological importance by combining in a single and soluble product with magnetic and nonlinear optical properties.
机译：磁性纳米晶体的独特性质引发了对其有效功能化和在许多技术领域中的应用的深入研究。尽管对磁性胶体的合成进行了深入研究，但对磁性聚电解质球形刷的合成，表征和性能的认识有限。在本工作中，描述了这种杂化物的制备以及随后形成稳定的水性胶体。球形刷的核心由平均直径为17 nm的磁性γ-Fe_2O_3纳米微晶（刻面但大多为球形）组成。如傅立叶变换红外光谱显示的，形成周围刷层的生物粘附性聚电解质聚（4-苯乙烯磺酸钠）被证明是一种有效的共价修饰氧化铁表面的大分子。讨论了关于胶体方面的几种观察结果，并通过描述具有软聚合物核的聚电解质刷的模型和实验成功地进行了解释。最后，通过将具有磁性和非线性光学特性的单一可溶产品结合在一起，这些杂种表现出了其多功能性和技术重要性。

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