摘要
研究了十六胺有机膜对羟基磷灰石(HAP)的晶体结构、形核、晶体形貌和结晶学定向生长的调控作用及其机理.结果表明:无有机膜时,生成物为磷酸八钙(OCP)和羟基磷灰石(HAP)的混合物,其生长速率很低且晶体排列无一定规则;在十六胺有机膜的调控下,生成物为规则排列、沿<0001>定向生长、结晶良好的片状纳米羟基磷灰石晶体,且其形核和生长速率均很高.十六胺有机膜上有大量极性强、电荷密度高的-NH+3基团,它们通过静电作用在有机膜/溶液界面处形成局域过饱和浓度,促进羟基磷灰石晶体的形核;另一方面,十六胺有机膜的二维晶格尺寸与HAP(0001)面的晶格参数具有良好的匹配关系,构造了一个有利于HAP以(0001)面形核生长的结构框架,促进了HAP相沿<0001>方向的定向生长.
The crystal growth of hydroxyapatite (HAP) in the presence of hexadecylamine was investigated by the patterns of X-ray diffractions (XRD), Fourier transformed infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected-area diffraction (SAD). The results showed that the organic film could increase the ions supersaturation on its surface, thus leading to a fast growth of pure HAP crystals. Moreover, the positive headgroups in the organic film could act as recognized nucleation sites and orient the growth of HAP crystals along (0001) direction.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2004年第1期66-70,共5页
Chinese Journal of Materials Research
基金
国家八六三计划新材料领域2003AA302210
湖南省杰出中青年专家科技专项计划02JJYB008资助项目.
关键词
无机非金属材料
生物活性材料
定向生长
生物矿化
羟基磷灰石
Crystal growth
Films
Fourier transform infrared spectroscopy
Nucleation
Organic compounds
Scanning electron microscopy
Transmission electron microscopy
X ray diffraction analysis
