Size and shape controlled synthesis of Ni/Al Layered Double Hydroxides magnetic nanoparticles

Luan Lingyu; Liu Shangying; Zhang Jie; Zhu Wenxia; Sun Dejun

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Size and shape controlled synthesis of Ni/Al Layered Double Hydroxides magnetic nanoparticles

Luan Lingyu * #,Liu Shangying,Zhang Jie,Zhu Wenxia,Sun Dejun

Key Laboratory for Colloid and Interface Chemistry of the Ministry of Education of Shandong University

*Correspondence author

#Submitted by

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Funding: none

Opened online:13 March 2007

Accepted by: none

Citation: Luan Lingyu,Liu Shangying,Zhang Jie.Size and shape controlled synthesis of Ni/Al Layered Double Hydroxides magnetic nanoparticles[OL]. [13 March 2007] http://en.paper.edu.cn/en_releasepaper/content/11396

We investigated the influence of the peptization process on the size and shape of layered double hydroxide magnetic nanoparticles. In this paper, we prepared 1:1 Ni/Al layered double hydroxide magnetic nanoparticles in aqueous solution. By adjusting the peptization temperature and time, we can efficiently control the particle size, shape and size polydispersity, which are important for the formation of oriented films, the liquid-crystalline phase behavior and the stability of Pickering emulsions. The particle growth followed the mechanisms of Ostwald ripening and imperfect oriented attachment. The suspensions peptized at lower temperatures were not well dispersed; while the particles in suspensions peptized at higher temperatures were apt to form larger aggregates. Peptization time also affected the polydispersity. Peptization at 130℃ for 24 h proved to be the optimal synthesis conditions and magnetic measurements showed that this material is paramagnetic.

Keywords:Layered Double Hydroxides; Peptization; Magnetic nanoparticles; Ostwald ripening; Imperfect oriented attachment.

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