scholarly journals Free-volume Characterization of Polysilanes Using Positron Annihilation Spectroscopy.

1999 ◽  
Vol 12 (5) ◽  
pp. 739-742
Author(s):  
Mutsumi Tashiro ◽  
Shu Seki ◽  
Pradeep K. Pujari ◽  
Yoshihide Honda ◽  
Seiichi Tagawa
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Positron Annihilation Spectroscopy

Characterization of Free Volume in a Bulk Metallic Glass Using Positron Annihilation Spectroscopy

2002 ◽  
Vol 17 (5) ◽  
pp. 1153-1161 ◽  
Author(s):  
K. M. Flores ◽  
D. Suh ◽  
R. H. Dauskardt ◽  
P. Asoka-Kumar ◽  
P. A. Sterne ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Positron Annihilation ◽  
Bulk Metallic Glass ◽  
Free Volume ◽  
Positron Annihilation Spectroscopy ◽  
Relaxation Processes ◽  
Nickel Copper ◽  
Atomic Relaxation ◽  
Volume Decrease

The free volume of metallic glasses has a significant effect on atomic relaxation processes, although a detailed understanding of the nature and distribution of free volume sites is currently lacking. Positron annihilation spectroscopy was employed to study free volume in a Zr–Ti–Ni–Cu–Be bulk metallic glass following plastic straining and cathodic charging with atomic hydrogen. Multiple techniques were used to show that strained samples had more open volume, while moderate hydrogen charging resulted in a free volume decrease. It was also shown that the free volume is associated with zirconium and titanium at the expense of nickel, copper, and beryllium. Plastic straining led to a slight chemical reordering.

Characterization of ethylcellulose free films by positron annihilation spectroscopy and mechanical testing

2014 ◽  
Vol 115 ◽  
pp. 47-50 ◽  
Author(s):  
Diána Hegyesi ◽  
Károly Süvegh ◽  
András Kelemen ◽  
Klára Pintye-Hódi ◽  
Géza Regdon
Keyword(s):  
Positron Annihilation ◽  
Mechanical Testing ◽  
Positron Annihilation Spectroscopy ◽  
Free Films

scholarly journals Insightful understanding of the correlations of the microstructure and catalytic performances of Pd@chitosan membrane catalysts studied by positron annihilation spectroscopy

RSC Advances ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 3225-3236 ◽  
Author(s):  
Qi Liu ◽  
Mengdie Xu ◽  
Jing Zhao ◽  
Yudong Wang ◽  
Chenze Qi ◽  
...  
Keyword(s):  
Mass Transport ◽  
Positron Annihilation ◽  
Free Volume ◽  
Positron Annihilation Spectroscopy ◽  
Membrane Catalyst ◽  
Chitosan Membrane ◽  
Transport Channels ◽  
Catalytic Performances

A number of instantaneously connected free volume holes act as mass transport channels of the Pd0@CS membrane catalyst in reactions.

Crosslinked PVA/SSA proton exchange membranes: correlation between physiochemical properties and free volume determined by positron annihilation spectroscopy

2018 ◽  
Vol 20 (44) ◽  
pp. 28287-28299 ◽  
Author(s):  
Mahmoud M. Gomaa ◽  
Christoph Hugenschmidt ◽  
Marcel Dickmann ◽  
Esam E. Abdel-Hady ◽  
Hamdy F. M. Mohamed ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Positron Annihilation Spectroscopy ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Water Molecules ◽  
High Humidity ◽  
Physiochemical Properties ◽  
Low Humidity ◽  
Volume Size

At low humidity (<30 RH%), water molecules begin to fill the intermolecular spaces in the membrane. At high humidity (80 RH%) the membrane swells; the free volume size increases.

scholarly journals Microstructural characterization of alumina–zirconia layered ceramics using positron annihilation spectroscopy

2010 ◽  
Vol 58 (8) ◽  
pp. 3014-3021 ◽  
Author(s):  
P. Parente ◽  
Y. Ortega ◽  
B. Savoini ◽  
M.A. Monge ◽  
A. Tucci ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Microstructural Characterization ◽  
Positron Annihilation Spectroscopy ◽  
Layered Ceramics
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