Roles of polyacrylate dispersant in the synthesis of well-dispersed BaSO4 nanoparticles by simple precipitation--颗粒学报PARTICUOLOGY

Sun, Y., Zhang, F., Wu, D., & Zhu, H. (2014). Roles of polyacrylate dispersant in the synthesis of well-dispersed BaSO4 nanoparticles by simple precipitation. Particuology, 14, 33–37. https://doi.org/10.1016/j.partic.2013.02.005

Roles of polyacrylate dispersant in the synthesis of well-dispersed BaSO₄ nanoparticles by simple precipitation

Yingying Sun, Feng Zhang, Daxiong Wu, Haitao Zhu^*

College of Materials Science & Engineering, Qingdao University of Science & Technology, Qingdao 266042, China

10.1016/j.partic.2013.02.005

Volume 14, June 2014, Pages 33-37

Received 27 November 2012, Revised 26 January 2013, Accepted 7 February 2013, Available online 22 June 2013.

E-mail: htzhu1970@163.com

Highlights

• BaSO₄nanoparticles were synthesized with simple precipitation in the presence of PAAS.

• Intermediates derived from the interaction of PAAS and Ba²⁺ play a role as control releasing agent.

• The method yields BaSO₄ nanoparticles with narrow distribution and good dispersibility.

Abstract

Well-dispersed BaSO4 nanoparticles were synthesized in the presence of sodium polyacrylate (PAAS) by a simple precipitation method, with BaCl₂ and (NH4)₂SO₄ as reactants. The different roles performed by PAAS in the synthesis of BaSO₄ nanoparticles were investigated using X-ray diffractometry, Fourier transform infrared spectroscopy, and transmission electron microscopy. The results indicate that the as-synthesized BaSO₄ nanoparticles were spheres with an average diameter of 30 nm and that their surfaces were affected by the PAAS. Under a typical procedure employed, PAAS reacted with BaCl₂ to yield an intermediate, serving as a control releasing agent and separating the nucleation and crystal growth processes of the BaSO₄ nuclei. During formation of the BaSO₄ nanospheres, the intermediate slowly dissolved and released barium and polyacrylate ions, inhibiting the growth and aggregation of newly formed BaSO₄ seeds and resulting in particles of narrow diameter distribution and improved dispersibility. Moreover, these polyacrylate ions further modified the surfaces of the BaSO₄ nanoparticles.

Graphical abstract

Keywords

BaSO₄ nanoparticles; Sodium polyacrylate; Precipitation; Control releasing agent; Dispersant

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