Atomic force microscopic determination of substrate effects on the structure of deposited biomineral phosphates
Atomic force microscopic determination of substrate effects on the structure of deposited biomineral phosphates
复制标题
原子力显微镜测定底物对沉积生物矿物磷酸盐结构的影响
作者：
L. Siperko;W. Landis
通过原子力显微镜在两种生物晶体，羟基磷灰石（HA）和透钙磷石（DCPD）的表面上观察到的周期性，已经允许识别指示在几个衬底上的优选取向的晶面。从分离的HA晶体簇，沉积在玻璃基板上，两个晶面被确定。HA的0.001 μ m和0.110 μ m间距与从晶体学数据中获得的公开值一致。对沉积在玻璃上的DCPD片晶进行测量，得到的原子间距被认为是110 nm晶面的原子间距。对于这两种矿物，原子尺度成像的比较显示了玻璃或新鲜切割的云母上的沉积物之间的差异。当比较金、玻璃和云母的矿床时，也发现较大规模的结构不同。一个非常有序的结构时，发现HA沉积到金基板上，已与单层的烷硫醇改性。这些观察结果表明，不同的基板影响的最终结构的晶体所确定的原子力显微镜表面表征。
Periodicity observed by atomic force microscopy on the surface of two biological crystals, hydroxyapatite (HA) and brushite (DCPD), has allowed identification of crystal planes indicative of preferred orientation on several substrates. From isolated HA crystal clusters, deposited on to a glass substrate, two crystal planes were identified. The 〈001〉 and 〈110〉 spacings of HA are in agreement with published values taken from crystallographic data. Measurements made on DCPD platelets, deposited on to glass, yielded atomic spacings presumed to be those of the 〈110〉 crystal plane. For both minerals, comparison of atomic-scale imaging showed differences between deposits on glass or freshly cleaved mica. Larger scale structure was also found to differ when the mineral deposits were compared on gold, glass and mica. A very ordered structure was found when HA was deposited on to a gold substrate that had been modified with a monolayer of an alkane thiol. These observations suggest that different substrates influence the final structure of the crystals as determined by atomic force microscopic surface characterization.
影响因子：
2.9
作者：
LANDIS, WJ;MORADIANOLDAK, J;WEINER, S
通讯作者：
WEINER, S