Determination of core and hydrodynamic size distributions of CoFe2O4 nanoparticle suspensions using ac susceptibility measurements

2010 ◽  
Vol 108 (3) ◽  
pp. 033918 ◽  
Author(s):  
F. Ludwig ◽  
A. Guillaume ◽  
M. Schilling ◽  
N. Frickel ◽  
A. M. Schmidt
Keyword(s):  
Ac Susceptibility ◽  
Hydrodynamic Size ◽  
Size Distributions ◽  
Nanoparticle Suspensions

Characterization and Manipulation of Exposed Ge Nanocrystals

2004 ◽  
Vol 818 ◽  
Author(s):  
I.D. Sharp ◽  
Q. Xu ◽  
C.Y. Liao ◽  
D.O. Yi ◽  
J.W. Ager ◽  
...  
Keyword(s):  
Hydrofluoric Acid ◽  
Metal Films ◽  
Silica Matrix ◽  
Size Distributions ◽  
Si Substrates ◽  
Atomic Force ◽  
Transmission Electron ◽  
Oxide Matrix ◽  
Ge Nanocrystals

AbstractIsotopically pure 70Ge and 74Ge nanocrystals embedded in SiO2 thin films on Si substrates have been fabricated through ion implantation and thermal annealing. Nanocrystals were subsequently exposed using a hydrofluoric acid etching procedure to selectively remove the oxide matrix while retaining up to 69% of the implanted Ge. Comparison of transmission electron micrographs (TEM) of as-grown crystals to atomic force microscope (AFM) data of exposed crystals reveals that the nanocrystal size distribution is very nearly preserved during etching. Therefore, this process provides a new means to use AFM for rapid and straightforward determination of size distributions of nanocrystals formed in a silica matrix. Once exposed, nanocrystals may be transferred to a variety of substrates, such as conducting metal films and optically transparent insulators for further characterization.

THE VARIATION OF IN SITU MEASURED SOIL WATER PROPERTIES WITHIN SOIL MAP UNITS

1980 ◽  
Vol 60 (3) ◽  
pp. 497-509 ◽  
Author(s):  
G. C. TOPP ◽  
W. D. ZEBCHUK ◽  
J. DUMANSKI
Keyword(s):  
Pore Space ◽  
Size Distributions ◽  
Water Capacity ◽  
Intermediate Group ◽  
Pore Size Distributions ◽  
Soil Units ◽  
Soil Water Properties ◽  
Soil Unit

The in situ saturated hydraulic conductivities of nine soil units were measured and cores of the same soil were taken to the laboratory for determination of desorption water capacity relationships. Hydraulic conductivities for the coarse- and fine-textured soils were equivalent and higher than that for medium-textured soils. However, the coarse- and fine-textured soils showed measurably different desorption curves for each of three soil units tested. Variability of duplicate measurements of hydraulic conductivity at sites were found to be considerably less than that of the soil unit as a whole. The highly variable in situ hydraulic conductivities resulted in separations of two groups of soil with significantly different values. A third intermediate group was not significantly different from the other two. The desorption curves were discussed in relation to differences in pore size distributions, identifying proportions of the pore space attributable to structural pores and to textural pores.

Determination of Fiber Size Distributions of Injection Moulded Polypropylene/Natural Fibers Using X-ray Microtomography

2008 ◽  
Vol 10 (1-2) ◽  
pp. 126-130 ◽  
Author(s):  
A. Alemdar ◽  
H. Zhang ◽  
M. Sain ◽  
G. Cescutti ◽  
J. Müssig
Keyword(s):  
Natural Fibers ◽  
Size Distributions ◽  
X Ray ◽  
Fiber Size

Determination of critical current densities of YBa2Cu3O7−δ thin films from AC susceptibility measurements

1993 ◽  
Vol 205 (3-4) ◽  
pp. 311-322 ◽  
Author(s):  
W. Xing ◽  
B. Heinrich ◽  
J. Chrzanowski ◽  
J.C. Irwin ◽  
H. Zhou ◽  
...  
Keyword(s):  
Thin Films ◽  
Critical Current ◽  
Ac Susceptibility ◽  
Current Densities
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