Interfacial-Dependent Morphologies in the Self-Organization System of Chiral Molecules Observed by Atomic Force Microscopy

2002 ◽  
Vol 106 (8) ◽  
pp. 1960-1967 ◽  
Author(s):  
Yan Jie Zhang ◽  
Ming Jin ◽  
Ran Lu ◽  
Yanlin Song ◽  
Lei Jiang ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
The Self ◽  
Self Organization ◽  
Chiral Molecules ◽  
Force Microscopy ◽  
Atomic Force

Shape Transition of InAs Islands on InP (111)A

2000 ◽  
Vol 618 ◽  
Author(s):  
Hanxuan Li ◽  
Theda Daniels-Race ◽  
Mohamed-Ali Hasan
Keyword(s):  
Quantum Dots ◽  
Atomic Force Microscopy ◽  
Aspect Ratio ◽  
Critical Size ◽  
The Self ◽  
Self Organization ◽  
Shape Transition ◽  
Force Microscopy ◽  
Atomic Force

ABSTRACTAtomic force microscopy (AFM) reveals that InAs islands grown on InP (111)A, as they grow in size, undergo a shape transition. Below a critical size of around 30 nm, round-shaped quantum dots form, while above this size they grow in the shape of triangles, reflecting the symmetry of the (111) substrates. The edges of triangular islands are aligned along the three equivalent {110} directions of the InP (111) surface. The triangular islands grow laterally much faster than vertically, indicating the aspect ratio decrease of the islands with increasing InAs coverage. Our results provide a better understanding of the self-organization behaviors of InAs on InP (111)A.

Atomic force microscopy study of self-organization of chiral azobenzene derived from amino acid

2003 ◽  
Vol 220 (1-4) ◽  
pp. 224-230 ◽  
Author(s):  
Yanjie Zhang ◽  
Changhui Tan ◽  
Qingsheng Liu ◽  
Ran Lu ◽  
Yanlin Song ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Amino Acid ◽  
Microscopy Study ◽  
Self Organization ◽  
Atomic Force Microscopy Study ◽  
Force Microscopy ◽  
Atomic Force

Self-organization of phthalocyanines on Al2O3 (1120) in aligned and ordered films

2004 ◽  
Vol 19 (7) ◽  
pp. 2061-2067 ◽  
Author(s):  
E. Barrena ◽  
J.O. Ossó ◽  
F. Schreiber ◽  
M. Garriga ◽  
M.I. Alonso ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Self Organization ◽  
X Ray Diffraction ◽  
Direction Parallel ◽  
Force Microscopy ◽  
Molecular Arrangement ◽  
Atomic Force ◽  
Organization Process ◽  
Microscopy Images ◽  
Molecular Stacking

We studied the self-organization process of F16CuPc films (20–30 ML) on stepped Al2O3 (1120) substrates. X-ray diffraction measurements revealed a highly ordered layered structure with the molecules in a nearly upright configuration. The morphology, investigated by atomic force microscopy, consisted of long (several microns) and narrow (20–100 nm) needlelike terraces unidirectionally aligned along one of the main crystallographic directions of the Al2O3 (1120) surface. High resolution atomic force microscopy images revealed in-plane molecular order with the molecular stacking direction parallel to the needlelike terraces. Such anisotropic morphology is the result of a self-organization process of F16CuPc in elongated crystallites driven to a preferential orientation by the interaction with the substrate. Spectroscopic ellipsometry showed that these films exhibit anisotropic optical properties correlated with the molecular arrangement.

NANOSTRUCTURES FROM DESIGNER PEPTIDES

COSMOS ◽  
2008 ◽  
Vol 04 (02) ◽  
pp. 173-183
Author(s):  
BOON TEE ONG ◽  
PARAYIL KUMARAN AJIKUMAR ◽  
SURESH VALIYAVEETTIL
Keyword(s):  
Atomic Force Microscopy ◽  
Solid State ◽  
Self Assembly ◽  
Size Range ◽  
The Self ◽  
Mica Surface ◽  
Force Microscopy ◽  
Solution Structures ◽  
Atomic Force

The present article reviews the self-assembly of oligopeptides to form nanostructures, both in solution and in solid state. The solution structures of the peptides were examined using circular dichroism and dynamic light scattering. The solid state assembly was examined by adsorbing the peptides onto a mica surface and analyzing it using atomic force microscopy. The role of pH and salt concentration on the peptide self-assembly was also examined. Nanostructures within a size range of 3–10 nm were obtained under different conditions.

Self-Assembled Lipid Tubules: Synthesis, Characterization, and Ordered Arrays

2006 ◽  
Vol 922 ◽  
Author(s):  
Yue Zhao ◽  
Nidhi Mahajan ◽  
Jiyu Fang
Keyword(s):  
Atomic Force Microscopy ◽  
Lipid Bilayer ◽  
Surface Patterning ◽  
The Self ◽  
Two Dimensional ◽  
Force Microscopy ◽  
Ordered Arrays ◽  
Atomic Force ◽  
Self Assembled ◽  
Lipid Tubules

AbstractThe rolling of lipid bilayer sheets into hollow cylindrical tubules have emerged as a group of interesting supramolecular nanostructures. Here, we image the self-assembled tubules of 1,2-bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphochloline (DC8,9PC) with atomic force microscopy. Nanoscale ripple structures with a periodicity of ~ 200nm in the cylindrical lipid tubules are observed. We develop two simple methods based on microfluidic networks and surface patterning to produce two dimensional ordered arrays of parallel aligned lipid tubules on substrates.

Twin structure in Yb:YAl3(BO3)4crystal

2001 ◽  
Vol 34 (5) ◽  
pp. 661-662 ◽  
Author(s):  
Shanrong Zhao ◽  
Jiyang Wang ◽  
Daliang Sun ◽  
Xiaobo Hu ◽  
Hong Liu
Keyword(s):  
Atomic Force Microscopy ◽  
Single Crystals ◽  
Chemical Etching ◽  
Laser Crystal ◽  
Frequency Doubling ◽  
Twin Plane ◽  
The Self ◽  
Twin Structure ◽  
Force Microscopy ◽  
Atomic Force

Twin structure is a defect in the self-frequency-doubling laser crystal material Yb:YAl3(BO3)4(YbYAB). Based on atomic force microscopy (AFM) observations, a check-like twin structure in YbYAB crystals is found. This kind of twin structure has three twin composition planes: (10\bar{1}1), (0\bar{1}11) and (\bar{1}101). These three twin composition planes result in a series of twin boundaries in two directions, forming a check-like pattern on each face. From the orientation of the chemical etching pits on each side of the twin boundary, it is found that the twin element is `twin plane ⊥yaxis', alternatively indicated as `twin plane {11\bar{2}0}'. The two single crystals composing the twin are a right form and a left form. This kind of twin is similar to the Brazil twin found in quartz.

Sign in / Sign up

Export Citation Format

Share Document