• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Think Positive: Phase Separation Enables a Positively Charged Additive to Induce Dramatic Changes in Calcium Carbonate Morphology
【24h】

Think Positive: Phase Separation Enables a Positively Charged Additive to Induce Dramatic Changes in Calcium Carbonate Morphology

机译：积极思考：相分离使带正电荷的添加剂引起碳酸钙形态的急剧变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Soluble macromolecules are essential to Nature's control over biomineral formation. Following early studies where macromolecules rich in aspartic and glutamic acid were extracted from nacre, research has focused on the use of negatively charged additives to control calcium carbonate precipitation. It is demonstrated that the positively charged additive poly(allylamine hydro-chloride) (PAH) can also cause dramatic changes in calcite morphologies, yielding thin films and fibers of CaCO_3 analogous to those produced with poly(aspartic acid) via a so-called PILP (polymer-induced liquid precursor) phase. The mechanism by which PAH induces these effects is investigated using a range of techniques including cryo transmission electron microscopy (TEM), Raman microscopy, and thermogravimetric analysis, and the data show that hydrated Ca~(2+)/PAH/CO_3~(2-) droplets initially form in solution, before coalescing and ultimately crystallizing to give calcite, together with small quantities of vaterite. It is suggested that it is the initial formation of hydrated Ca~(2+)/PAH/CO_3~(2-) droplets that is key to this process, rather than a specific polymer/mineral interaction. These results are discussed in terms of their relevance to biomineralization processes and highlight the opportunity for using counter-ion-induced phase separation of polyelectrolytes as a method for generating minerals with non-crystallographic morphologies.
机译：可溶性大分子对于自然界对生物矿物质形成的控制至关重要。在早期的研究中，从珍珠母中提取了富含天冬氨酸和谷氨酸的大分子，研究的重点是使用带负电荷的添加剂来控制碳酸钙的沉淀。结果表明，带正电荷的添加剂聚烯丙胺盐酸盐（PAH）还可引起方解石形态发生显着变化，产生类似于所谓的PILP的聚天冬氨酸产生的CaCO_3薄膜和纤维。 （聚合物诱导的液体前体）相。使用冷冻透射电子显微镜（TEM），拉曼显微镜和热重分析等技术研究了PAH诱导这些效应的机理，数据表明水合Ca〜（2 +）/ PAH / CO_3〜（2 -）液滴最初在溶液中形成，然后聚结并最终结晶成方解石，以及少量的球ate石。有人认为，水合Ca〜（2 +）/ PAH / CO_3〜（2-）液滴的初始形成是该过程的关键，而不是特定的聚合物/矿物相互作用。讨论了这些结果与生物矿化过程的相关性，并突出了使用反离子诱导的聚电解质相分离作为产生具有非晶体形态的矿物的方法的机会。

著录项

  • 来源
    《Advanced Functional Materials》 |2012年第5期|p.907-915|共9页
  • 作者

    Bram Cantaert; Yi-Yeoun Kim; Henning Ludwig; Fabio Nudelman; Nico A.J. M. Sommerdijk; Fiona C. Meldrum;

  • 作者单位

    School of Chemistry University of Leeds Woodhouse Lane, Leeds, LS2 9JT, UK;

    School of Chemistry University of Leeds Woodhouse Lane, Leeds, LS2 9JT, UK;

    School of Chemistry University of Leeds Woodhouse Lane, Leeds, LS2 9JT, UK;

    Laboratory of Materials and Interface Chemistry Eindhoven University of Technology P. O. Box 513, 5600 MB Eindhoven, The Netherlands;

    Laboratory of Materials and Interface Chemistry Eindhoven University of Technology P. O. Box 513, 5600 MB Eindhoven, The Netherlands;

    School of Chemistry University of Leeds Woodhouse Lane, Leeds, LS2 9JT, UK;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号