Fracture Surface Topography of TNT Using Atomic Force Microscopy

1994 ◽  
pp. 127-135
Author(s):  
M. Yvonne D. Lanzerotti ◽  
A. G. Rinzler ◽  
James J. Pinto ◽  
D. J. Thomson ◽  
A. Wolfe
Keyword(s):  
Atomic Force Microscopy ◽  
Fracture Surface ◽  
Surface Topography ◽  
Force Microscopy ◽  
Atomic Force

Investigation on the Surface Topography in Polishing Using Atomic Force Microscopy

CIRP Annals ◽  
1996 ◽  
Vol 45 (1) ◽  
pp. 523-528 ◽  
Author(s):  
L. De Chiffre ◽  
H.N. Hansen ◽  
A. Bronstein
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Topography ◽  
Force Microscopy ◽  
Atomic Force

Nanofractography Of Composition B Fracture Surfaces with AFM

2003 ◽  
Vol 800 ◽  
Author(s):  
Y. D. Lanzerotti ◽  
J. Sharma ◽  
R. W. Armstrong ◽  
R. L. McKenney ◽  
T. R. Krawietz
Keyword(s):  
Atomic Force Microscopy ◽  
Tensile Strength ◽  
Fracture Surface ◽  
Surface Morphology ◽  
Fracture Surface Morphology ◽  
Fine Scale ◽  
Force Microscopy ◽  
Atomic Force ◽  
High Acceleration ◽  
Columnar Grains

ABSTRACTThe characteristics of TNT (trinitrotoluene) crystals in the fracture surface of Composition B (a melt-cast mixture of TNT and RDX) have been studied using atomic force microscopy (AFM). The size of TNT crystals has been examined by analyzing the surface structure that is exhibited after mechanical failure of the Composition B. The failure occurs when the material is subjected to high acceleration in an ultracentrifuge and the shear or tensile strength is exceeded. AFM examination of the topography of the Composition B fracture surface reveals fracture across columnar grains of the TNT. The width of the columnar TNT grains ranges in size from ∼ 1 μm to ∼ 2 μm. Their height ranges in size from ∼ 50 nm to ∼ 300 nm. Flat TNT columns alternate with TNT columns containing river patterns that identify the direction of crack growth. Steps in the river patterns are a few nanometers in depth. The TNT constitutent fracture surface morphology is shown to occur on such fine scale, beginning from adjacent columnar crystals only 1–2 μm in width, and including river marking step heights of only a few nanometers, that AFM-type resolution is required.

scholarly journals Structural and Topological Differences between a Glycopeptide-Intermediate Clinical Strain and Glycopeptide-Susceptible Strains of Staphylococcus aureus Revealed by Atomic Force Microscopy

2000 ◽  
Vol 44 (12) ◽  
pp. 3456-3460 ◽  
Author(s):  
Susan Boyle-Vavra ◽  
Jongin Hahm ◽  
S. J. Sibener ◽  
Robert S. Daum
Keyword(s):  
Staphylococcus Aureus ◽  
Atomic Force Microscopy ◽  
Cell Surface ◽  
Surface Topography ◽  
Clinical Strain ◽  
Force Microscopy ◽  
Atomic Force

ABSTRACT Novel cell surface topography was revealed on cocci from a glycopeptide-intermediate Staphylococcus aureus (GISA) clinical strain by using atomic force microscopy. The GISA isolate and its revertant had two parallel circumferential surface rings. One equatorial surface ring was observed in control strains. In vancomycin-susceptible strains, additional rings were formed in the presence of vancomycin. Ring depth measurements also revealed striking differences between the GISA strain and susceptible strains grown with or without vancomycin.

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