Production and characterization of highly intense and collimated cluster beams by inertial focusing in supersonic expansions

2001 ◽  
Vol 72 (5) ◽  
pp. 2261-2267 ◽  
Author(s):  
P. Piseri ◽  
A. Podestà ◽  
E. Barborini ◽  
P. Milani
Keyword(s):  
Inertial Focusing ◽  
Supersonic Expansions ◽  
Cluster Beams

Synthesis and Characterization of Cluster-Assembled Carbon Films

1999 ◽  
Vol 593 ◽  
Author(s):  
P. Milani ◽  
P. Piseri ◽  
E. Barborini ◽  
A. Podestà
Keyword(s):  
Carbon Films ◽  
Cluster Growth ◽  
Precursor Cluster ◽  
Nanostructured Carbon ◽  
Beam Formation ◽  
Supersonic Expansions ◽  
Cluster Beams ◽  
First Time ◽  
Deposited Films

ABSTRACTNanostructured carbon films have been grown by deposition of supersonic cluster beams. A novel pulsed microplasma cluster source allows to obtain cluster beams of high intensity and stability. Cluster growth and beam formation have been charaterized. Separation effects typical of supersonic expansions cause inhomogeneities of cluster distribution in the beam, depending on their masses. This effect, observed for the first time, has been carefully characterized. The deposited films have a low density porous structure based on nanometer-size grains. The coordination is essentially three-fold with a large number of defects. Film density, morphology and surface roughness can be controlled by varying the precursor cluster mass distribution. Applications of cluster-assembled carbon films will be presented.

Theoretical and experimental characterization of supersonic expansions from slit sources

1982 ◽  
Vol 87 (6) ◽  
pp. 515-519 ◽  
Author(s):  
Mark Sulkes ◽  
Christophe Jouvet ◽  
Stuart A Rice
Keyword(s):  
Experimental Characterization ◽  
Supersonic Expansions

Thermodynamic Characterization of Supersonic Expansions Using Shadowgraphy and Numerical Simulations

2013 ◽  
Author(s):  
Juan M. Lorenzi ◽  
Carlos A. Rinaldi ◽  
Cynthia Toro Salazar ◽  
Mayo Villagran Muñiz ◽  
Salvador C. Ortiz
Keyword(s):  
Numerical Simulations ◽  
Thermodynamic Characterization ◽  
Supersonic Expansions

Supersonic Cluster Beam Synthesis of Nanophase Materials

1999 ◽  
Vol 581 ◽  
Author(s):  
P. Milanil ◽  
S. Iannotta ◽  
F. Biasioli ◽  
P. Piseri ◽  
E. Barborini
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Tini Alloy ◽  
Cluster Beam ◽  
Crystallite Sizes ◽  
Nanophase Materials ◽  
Cluster Beams ◽  
Cluster Beam Deposition ◽  
Beam Deposition

ABSTRACTWe present the characterization of supersonic cluster beam deposition as a viable technique for the synthesis of nanostructured materials. Stable and intense cluster beams can be obtained with a pulsed microplasma cluster source. This technique has been applied to produce TiNi nanostructured thin films on various substrates at room temperature. The morphology and the structure of the film are strongly influenced by the precursor clusters. Films characterized by crystallite sizes of a few tens of nanometers can be grown without recrystallization by thermal annealing. The stoichiometry of the original TiNi alloy is maintained.

Production and characterization of supersonic carbon cluster beams

1984 ◽  
Vol 81 (7) ◽  
pp. 3322-3330 ◽  
Author(s):  
Eric A. Rohlfing ◽  
D. M. Cox ◽  
A. Kaldor
Keyword(s):  
Carbon Cluster ◽  
Cluster Beams

The formation and characterization of freon 22 cluster beams

2004 ◽  
Vol 30 (4) ◽  
pp. 345-347 ◽  
Author(s):  
V. N. Lokhman ◽  
E. A. Ryabov ◽  
D. D. Ogurok
Keyword(s):  
Cluster Beams

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

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