OBSERVATION OF DIRECT-CURRENT-INDUCED STEP BENDING PATTERNS ON Si(001)

2000 ◽  
Vol 07 (05n06) ◽  
pp. 577-582 ◽  
Author(s):  
J.-F. NIELSEN ◽  
J. P. PELZ ◽  
M. S. PETTERSEN
Keyword(s):  
Atomic Force Microscopy ◽  
Phase Shift ◽  
Optical Microscopy ◽  
Direct Current ◽  
Applied Current ◽  
Force Microscopy ◽  
Atomic Force ◽  
Theoretical Predictions ◽  
Step Density

Atomic force microscopy and optical microscopy were used to observe a novel "step bending" instability on vicinal Si(001) surfaces heated with direct current along a <110> direction. This instability occurs on areas where the applied current is parallel to the average step direction and consists of wavy step undulations with a nonzero phase shift between adjacent steps, consistent with theoretical predictions by Liu et al. [Phys. Rev. Lett.81, 2743 (1998)]. The resulting "bands" of high step density run obliquely to the direction of the applied current. These step patterns were observed on spherically dimpled surfaces, which also exhibit a variety of other electromigration-induced instabilities.

Atomic Force Microscopy of Annealed Plain Carbon Steels

2015 ◽  
Author(s):  
Surendra Kumar Gupta ◽  
Patricia Iglesias Victoria
Keyword(s):  
Atomic Force Microscopy ◽  
Optical Microscopy ◽  
Interlamellar Spacing ◽  
Lamellar Spacing ◽  
Optical Microscope ◽  
Carbon Steels ◽  
Force Microscopy ◽  
Atomic Force

Microstructure of annealed plain carbon steels is examined using optical microscopy. When the inter-lamellar spacing in pearlite is small, optical microscope at 1000X is unable to resolve the ferrite and cementite lamellae. In hyper-eutectoid steels, cementite in pearlite appears as darker phase whereas the pro-eutectoid cementite appears as a lighter phase. Atomic force microscopy (AFM) of etched steels is able to resolve ferrite and cementite lamellae in pearlite at similar magnifications. Both cementite in pearlite as well as pro-eutectoid cementite appear as raised areas (hills) in AFM images. Interlamellar spacing in pearlite increases with increasing hardenability of steel.

Precision Sinusoidal Local Scan for Large-Range Atomic Force Microscopy With Auxiliary Optical Microscopy

2015 ◽  
Vol 20 (1) ◽  
pp. 226-236 ◽  
Author(s):  
Chih-Lieh Chen ◽  
Jim-Wei Wu ◽  
Yi-Ting Lin ◽  
Li-Chen Fu ◽  
Mei-Yung Chen
Keyword(s):  
Atomic Force Microscopy ◽  
Optical Microscopy ◽  
Large Range ◽  
Force Microscopy ◽  
Atomic Force

AFM Study of Typical Fracture Surfaces in Room-Temperature Fracture of Sapphire

2009 ◽  
Vol 409 ◽  
pp. 113-122
Author(s):  
José M. López-Cepero ◽  
Sheldon M. Wiederhorn ◽  
António Ramirez de Arellano-López ◽  
Julian Martínez-Fernández
Keyword(s):  
Atomic Force Microscopy ◽  
Optical Microscopy ◽  
Special Interest ◽  
Room Temperature ◽  
Crystalline Orientation ◽  
Force Microscopy ◽  
Fracture Surfaces ◽  
Atomic Force ◽  
Temperature Fracture

Rhombohedral r-plane fracture surfaces in sapphire are analyzed by optical microscopy and by atomic force microscopy. Features of special interest include steps, lines and angles on the surface that appear to have crystallographic origins. A classification and description of these features is given over a scale ranging from hundreds of micrometers to tens of nanometers. Preferential directions in the surface are identified and related to the crystalline orientation of the sample; an attempt is made to identify the underlying phenomenology behind the appearance of each kind of feature.

scholarly journals Analysis of Immunolabeled Cells by Atomic Force Microscopy, Optical Microscopy, and Flow Cytometry

1994 ◽  
Vol 112 (1) ◽  
pp. 32-40 ◽  
Author(s):  
C. Neagu ◽  
K.O. van der Werf ◽  
C.A.J. Putman ◽  
Y.M. Kraan ◽  
B.G. de Grooth ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Atomic Force Microscopy ◽  
Optical Microscopy ◽  
Force Microscopy ◽  
Atomic Force

Algal Biophysics: Euglena Gracilis Investigated by Atomic Force Microscopy

2007 ◽  
Vol 555 ◽  
pp. 411-416
Author(s):  
C. Gruenberger ◽  
R. Ritter ◽  
F. Aumayr ◽  
Herbert Stachelberger ◽  
Ille C. Gebeshuber
Keyword(s):  
Atomic Force Microscopy ◽  
Optical Microscopy ◽  
Euglena Gracilis ◽  
Preparation Method ◽  
Algal Species ◽  
Environmental Constraints ◽  
Whole Cells ◽  
Force Microscopy ◽  
Atomic Force ◽  
Microscopy Investigation

Matter produced by organisms is remarkable. Evolutionary optimized properties, e.g. regarding hydrodynamic, aerodynamic, wetting and adhesive behavior, can already be found in the “simplest” forms of organisms. Euglena gracilis, a single-celled algal species, performs tasks as diverse as sensing the environment and reacting to it, converting and storing energy and metabolizing nutrients, living as a plant or an animal, depending on the environmental constraints. We developed a preparation method for atomic force microscopy investigation of dried whole Euglena cells in air and obtained data on whole cells as well as cell parts. Our studies corroborate TEM, SEM and optical microscopy results. Furthermore, we found new features on the pellicle, and set the ground for AFM force spectroscopy and viscoelastic studies on the nanoscale.

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