Control of CaCO3 Crystallization by Demixing of Monolayers

详细信息    查看全文

• 作者：Holger Mü ; ller ; Rudolf Zentel ; Andreas Janshoff ; Matthias Janke
• 刊名：Langmuir
• 出版年：2006
• 出版时间：December 19, 2006
• 年：2006
• 卷：22
• 期：26
• 页码：11034 - 11040
• 全文大小：636K
• 年卷期：v.22,no.26(December 19, 2006)
• ISSN：1520-5827

文摘

In this paper we describe how to template a demixed monolayer into a spatially patterned inorganic replica. Forthis purpose a new amphiphilic monomer was synthesized which can be polymerized both in solution and in themonolayer of a Langmuir-Blodgett (LB) trough. Since it inhibits the crystallization of CaCO₃, it can be used-incombination with stearic acid (nucleation-promotor)-to control CaCO₃ crystals formed under the monolayer.Investigations of the two-component monolayer (Langmuir isotherms and AFM measurements of transferred films)show-in the biphasic region-demixing in solid analogue stearic acid domains and the liquid analogue phase of themonomer. Crystallization of CaCO₃ starts under the stearic acid domains whose size varies from less than 100 nmto several tens of micrometers. The addition of poly(acrylic acid) into the subphase hinders the three-dimensionalgrowth of CaCO₃ crystals from the monolayer into the solution. Thus, it becomes possible to transfer the pattern ofthe demixed domains into an inorganic replica of CaCO₃.