Results 161 to 170 of about 1,771,729 (203)

Time-Temperature Superposition Principle Serving as a Design Tool for Tailored MOF-Crystal Glass Composite Membranes. [PDF]

Nat Commun
Chen Y, Yang Y, Ye M, Yu S, Zhou F, Li D, Sun Y, Tian L, Huang W, Hou J, Qiao Z.   +10 more
europepmc   +1 more source

Voltage control of magnetism in Ni-Co oxide mesoporous films: impact of porosity on oxygen magneto-ionics performance.

Nanoscale
Arredondo-López A, Eiler K, Quintana A, Ma Z, Liedke MO, Hirschmann E, Wagner A, Menéndez E, Sort J, Pellicer E.   +9 more
europepmc   +1 more source

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Single shot positron annihilation lifetime spectroscopy

Applied Physics Letters, 2006
Recent developments in positron trapping technology have made possible experimentation with dense interacting positronium gases. Along with these capabilities comes a need for suitable measurement techniques, and accordingly we have developed a method to measure positronium lifetimes from a single intense burst of positrons.
David Cassidy, A P Mills
exaly   +2 more sources

Antiplasticization of a polyamide: a positron annihilation lifetime spectroscopy study

Polymer, 2004
Abstract In order to modify the transport properties of the amorphous polyamide Trogamid-T™, several additives with structural characteristics that produce antiplasticization have been tested. Positron annihilation lifetime spectroscopy (PALS) has been used to determine both the size of free volume holes and the number of holes (free fractional free ...
Agustin Etxeberría Lizárraga
exaly   +2 more sources

Characterization of activated carbon fibers by Positron Annihilation Lifetime Spectroscopy (PALS)

, 2000
The use of Positron Annihilation Lifetime Spectroscopy (PALS) technique to characterize porous carbon materials has been analyzed. Positron annihilation lifetimes have been measured in two series of petroleum pitch-based activated carbon fibers (ACF) prepared by CO2 and steam activation.
Lozano-Castello, D., Cazorla-Amoros, D., Linares-Solano, A., Hall, P.J., Fernandez, J.J.   +4 more
core   +7 more sources

Positron annihilation lifetime spectroscopy of annealed tungsten

Kerntechnik, 2022
Abstract Three samples of 99.97% pure rolled tungsten were annealed at 700 °C, 1000 °C, and 1400 °C in a vacuum of about 10−6 mbar for 1 h. Then the effects of annealing were investigated. For this purpose, defects and their structure in the three annealed samples and the as-received sample, were studied, characterized, and compared by ...
Mahnaz Torabi, Omidreza Kakuee, Samad Sobhanian, Mohammad Kouhi   +3 more
openaire   +1 more source

Source correction in positron annihilation lifetime spectroscopy

Journal of Physics: Condensed Matter, 1996
The positron lifetimes in a source have been measured. The fraction of positrons annihilated in salt and in the Kapton supporting foils has been determined as a function of the atomic number Z of the sample. All of the experimental results have been compared with calculated values obtained from a computer program based on a Monte Carlo algorithm.
N Djourelov, M Misheva
openaire   +1 more source

Positron Annihilation Lifetime and Doppler Broadening Spectroscopy of polymers

Radiation Physics and Chemistry, 2020
Abstract Positron Annihilation Lifetime and Doppler Broadening spectroscopy of positron annihilation radiation are performed in four different polymers. The size of elementary free volume sites and their chemical environments are determined. It is shown that polymers with different groups of C–H, C O, and C–F can be distinguished by their orbital ...
A. Biganeh, O. Kakuee, H. Rafi-Kheiri, M. Lamehi-Rachti, N. Sheikh, E. Yahaghi   +5 more
openaire   +1 more source

Open volume in bioadhesive detected by positron annihilation lifetime spectroscopy

Acta Biomaterialia, 2010
Barnacles attach to a wide variety of surfaces underwater and show substrate-specific adhesion mechanisms. Investigating and understanding these mechanisms is a key for developing new technical adhesives. We expected open volume (porosity) at the sub-nanometre scale to occur in barnacle adhesive.
Klaus, Rätzke, Maja, Wiegemann, Muhammad Qasim, Shaikh, Stephan, Harms, Rainer, Adelung, Werner, Egger, Peter, Sperr   +6 more
openaire   +2 more sources

Positron Annihilation Lifetime Spectroscopy in the analysis of microstructural changes of Y-TZP ceramics

International Journal of Materials and Product Technology, 2009
Positron Annihilation Lifetime Spectroscopy (PALS) technique was used for microstructural characterisation of Y-TZP ceramics. Spectroscopic measurements were carried out on ceramic surfaces subjected to tribological tests.
Esposito L., Parente P., TIMELLINI, GIORGIO, Tucci A., Ferro G.   +4 more
exaly   +2 more sources