Novel Morphology of Calcium Carbonate Controlled by Poly(l-lysine)

Yuan Yao, Wenyong Dong, Shenmin Zhu, Xinhai Yu§ and Deyue Yan*
† School of Chemistry and Chemical Engineering
‡ State Key Laboratory of Metal Matrix Composites
Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P.R. China
§ School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, P.R. China
Langmuir, 2009, 25 (22), pp 13238–13243
DOI: 10.1021/la901913d
Publication Date (Web): July 15, 2009
Copyright © 2009 American Chemical Society
*To whom correspondence should be addressed.Telephone: +86-21-54742664. Fax: 54741297. E-mail: dyyan@sjtu.edu.cn.

Abstract

Abstract Image

The novel calcium carbonate (CaCO3) morphology, twin-sphere with an equatorial girdle, has been obtained under the control of poly(l-lysine) (PLys) through gas-diffusion method. The effect of the concentration of calcium cation and PLys, the reaction time, and the initial pH value are investigated, and various interesting morphologies, including twin-sphere, discus-like, hexagonal plate, and hallow structure are observed by using scanning electronic microscopy. Laser microscopic Raman spectroscopy studies indicated that all these CaCO3 are vaterite. A possible mechanism is suggested to explain the formation of the twin-sphere based morphologies according to the results. It is proven that alkaline polypeptides can control the mineralization of CaCO3 precisely as the reported acidic polypeptides and double hydrophilic block copolymers.

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History

  • Published In Issue November 17, 2009
  • Article ASAPJuly 15, 2009
  • Received: May 28, 2009
    Revised: June 30, 2009

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