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固液界面结合能的计算及其在核壳结构颗粒制备研究中的应用

作者:时间:2015-10-28点击数:

PDF全文下载:2015050530

李成峰, 孟凡涛, 周立娟, 董抒华, 李国昌

(山东理工大学 材料科学与工程学院,山东 淄博 255049)

摘要: 讨论了表面自由能色散分量、Lewis酸分量和Lewis碱分量的测定和计算方法,并计算得到固液界面结合能数值。通过计算水、酒精在羟基磷灰石(HAp)和二氧化硅表面的界面结合能,发现酒精在HAp表面的结合能要低于水在其表面的结合能。因此,在正硅酸乙酯水解为硅醇和缩聚为二氧化硅的过程中,需要对HAp进行表面改性并调控反应条件以使二氧化硅在HAp上沉积,同时避免二氧化硅在溶液中独立形核生长的分相现象,所开展的HAp/二氧化硅制备实验的结果也对这一理论推测进行了很好的验证。

关键词: 表面自由能; 固液结合能; 核壳结构颗粒; 羟基磷灰石; 二氧化硅

中图分类号:TB 303             文献标志码: A

Estimation and Application of Adhesion Energy Between Solid  and Liquid in Synthesis of Coreshell Structured Powders

LI Chengfeng, MENG Fantao, ZHOU Lijuan, DONG Shuhua, LI Guochang

(School of Materials Science and Technology, Shandong University of Technology, Zibo 255049,China)

Abstract: The interfacial energy was determined according to the dispersive component and Lewis acidbase property of surface free energy. The values of adhesion energy between liquid (water or ethanol) and solid (hydroxyapatite (HAp) or silica) were compared theoretically. Surface modification of HAp and optimization of reaction conditions were performed during synthesis of coreshell structured HAp/silica through the solgel process. The deposition of silica on HAp was finally accomplished without the occurrence of phase separation of silica in solution, which was ascribed with the theoretical calculation.

Key words: surface free energy; adhesion energy between solid and liquid; coreshell structured powders; hydroxyapatite; silica

 收稿日期: 20140911

基金项目: 山东省自然科学基金项目(ZR2013EML008);山东省高等学校科技计划项目(J11LD52);山东理工大学博士基金项目(406017).

作者简介: 李成峰(1979—),男,副教授,博士.

文章编号:16726987(2015)05053004; DOI: 10.16351/j.16726987.2015.05.011

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