Spiral growth on nanoporous silicoaluminophosphate STA-7 as observed by atomic force microscopy
Spiral growth on nanoporous silicoaluminophosphate STA-7 as observed by atomic force microscopy
复制标题
DOI：
10.1021/cg900255u
复制
发表时间：
2009-08
影响因子：
3.8
通讯作者：
P. Cubillas;M. Castro;K. Jelfs;A. J. W. Lobo;B. Slater;D. Lewis;P. Wright;Sam M. Stevens;Michael W Anderson
中科院分区：
文献类型：
--
作者：
P. Cubillas;M. Castro;K. Jelfs;A. J. W. Lobo;B. Slater;D. Lewis;P. Wright;Sam M. Stevens;Michael W Anderson
用原子力显微镜研究了STA-7晶体的表面。STA-7是由双六环单元(D6R)相互连接形成的硅铝磷酸盐纳米多孔固体。观察表明，在低过饱和度条件下形成了三种不同类型的螺旋。{0 0 1}面呈各向同性的螺旋面，Burgers矢为0.9 nm，相当于⟨0 0 1⟩方向上的一个D6R或一个晶胞。{100}面包含两种不同类型的螺旋。第一个具有0.9 nm的伯格斯矢量，或沿⟨100⟩的半个单位晶胞。这种位错改变了D6Rs的堆积顺序，导致了AEI结构的过度生长。第二种类型是交错螺旋，由Burgers矢量为1.8 nm或一个单位晶胞的位错产生，导致形成两个子台阶，每个子台阶具有不同的生长各向异性。这种各向异性受子步骤的形状和模板附着的能量学的影响。苏尔人的优势。
Atomic force microscopy was used to study the surface of STA-7 crystals. STA-7 is a silicoaluminophosphate, nanoporous solid formed by interlinked double six ring units (D6R). Observations showed the formation of three distinct types of spirals at low supersaturation conditions. The {001} face shows spirals with isotropic shapes and a Burgers vector of 0.9 nm, which corresponds to one D6R or one unit cell along the ⟨001⟩ direction. The {100} face contains two distinct types of spirals. The first has a Burgers vector of 0.9 nm, or half a unit cell along ⟨100⟩. This dislocation produces a change in the “stacking” sequence of the D6Rs generating an overgrowth with the AEI structure. The second type is an interlaced spiral and is generated by a dislocation with a Burgers vector of 1.8 nm or one unit cell, leading to the formation of two substeps each with a different growth anisotropy. This anisotropy is directed by the shape of the substep and the energetics of template attachment. The preponderance of a sur...