Synthesis of Mesoporous Transition-Metal Phosphates by Polymeric Micelle Assembly

Bishnu Prasad Bastakoti; Yunqi Li; Sudhina Guragain; Malay Pramanik; Saad M Alshehri; Tansir Ahamad; Zongwen Liu; Yusuke Yamauchi

doi:10.1002/chem.201600435

Synthesis of Mesoporous Transition-Metal Phosphates by Polymeric Micelle Assembly

Chemistry. 2016 May 23;22(22):7463-7. doi: 10.1002/chem.201600435. Epub 2016 Apr 18.

Authors

Bishnu Prasad Bastakoti^{1

2}, Yunqi Li^{1

3}, Sudhina Guragain¹, Malay Pramanik¹, Saad M Alshehri⁴, Tansir Ahamad⁵, Zongwen Liu², Yusuke Yamauchi^{6

7

8}

Affiliations

¹ World Premier International (WPI), Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
² School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia.
³ Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
⁴ Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia. alshehri@ksu.edu.sa.
⁵ Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.
⁶ World Premier International (WPI), Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan. yamauchi.yusuke@nims.go.jp.
⁷ Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan. yamauchi.yusuke@nims.go.jp.
⁸ Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia. yamauchi.yusuke@nims.go.jp.

PMID: 27087399
DOI: 10.1002/chem.201600435

Abstract

Mesoporous iron phosphate (FePO4 ) was synthesized through assembly of polymeric micelles made of asymmetric triblock co-polymer (polystyrene-b-poly-2-vinylpyridine-b-ethylene oxide; PS-PVP-PEO). The phosphoric acid solution stimulates the formation of micelles with core-shell-corona architecture. The negatively charged PO4 (3-) ions dissolved in the solution strongly interact with the positively charged PVP(+) units through an electrostatic attraction. Also, the presence of PO4 (3-) ions realizes a bridge between the micelle surface and the metal ions. The removal of polymeric template forms the robust framework of iron phosphate with 30 nm pore diameter and 15 nm wall thickness. Our method is applicable to other mesoporous metal phosphates by changing metal sources. The obtained materials were fully characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), N2 adsorption-desorption, Raman spectroscope, and other techniques.

Keywords: iron; mesoporous materials; metal phosphates; micelles; triblock co-polymers.

Publication types

Research Support, Non-U.S. Gov't