Results 1 to 10 of about 1,771,729 (203)

Probing the Free Volume in Polymers by Means of Positron Annihilation Lifetime Spectroscopy. [PDF]

Polymers (Basel), 2023
Positron annihilation lifetime spectroscopy (PALS) is a valuable technique to investigate defects in solids, such as vacancy clusters and grain boundaries in metals and alloys, as well as lattice imperfections in semiconductors. Positron spectroscopy is able to reveal the size, structure and concentration of vacancies with a sensitivity of 10−7. In the
Consolati G, Nichetti D, Quasso F.
europepmc   +4 more sources

Ultrashort, MeV-scale laser-plasma positron source for positron annihilation lifetime spectroscopy [PDF]

Physical Review Accelerators and Beams, 2021
Submicron defects represent a well-known fundamental problem in manufacturing since they can significantly affect performance and lifetime of virtually any high-value component. Positron annihilation lifetime spectroscopy is arguably the only established
Thomas L. Audet, Aaron Alejo, Luke Calvin, Mark Hugh Cunningham, Glenn Ross Frazer, Gagik Nersisyan, Michael Phipps, Jonathan Richard Warwick, Gianluca Sarri, Nasr A. M. Hafz, Christos Kamperidis, Song Li, Daniel Papp   +12 more
doaj   +9 more sources

Positron Annihilation Lifetime Spectroscopy Insight on Free Volume Conversion of Nanostructured MgAl₂O₄ Ceramics. [PDF]

Nanomaterials (Basel), 2021
Herein we demonstrate the specifics of using the positron annihilation lifetime spectroscopy (PALS) method for the study of free volume changes in functional ceramic materials.
Klym H, Karbovnyk I, Piskunov S, Popov AI.   +3 more
europepmc   +2 more sources

Defect Characterization of the SiO₂/Si Interface Investigated by Drift-Assisted Positron Annihilation Lifetime Spectroscopy. [PDF]

Nanomaterials (Basel)
This study demonstrates drift-assisted positron annihilation lifetime spectroscopy on a p-type (100) silicon substrate in a MOS capacitor, using an applied electric field to control the spatial positron distribution prior to annihilation.
Helm R, Egger W, Corbel C, Sperr P, Butterling M, Wagner A, Liedke MO, Hirschmann E, Mitteneder J, Mayerhofer M, Lee K, Duesberg GS, Dollinger G, Dickmann M.   +13 more
europepmc   +2 more sources

Measurements of Defect Structures by Positron Annihilation Lifetime Spectroscopy of the Tellurite Glass 70TeO₂-5XO-10P₂O₅-10ZnO-5PbF₂ (X = Mg, Bi₂, Ti) Doped with Ions of the Rare Earth Element Er³. [PDF]

Nanoscale Res Lett, 2017
The objective of the study was the structural analysis of the 70TeO2-5XO-10P2O5-10ZnO-5PbF2 (X = Mg, Bi2, Ti) tellurite glasses doped with ions of the rare-earth elements Er3+, based on the PALS (positron annihilation lifetime spectroscopy) method of ...
Pach K, Filipecki J, Golis E, Yousef ES, Boyko V.   +4 more
europepmc   +2 more sources

Data on pure tin by Positron Annihilation Lifetime Spectroscopy (PALS) acquired with a semi-analog/digital setup using DDRS4PALS. [PDF]

Data Brief, 2019
Positron annihilation lifetime spectroscopy (PALS) provides a powerful technique for non-destructive microstructure investigations in a broad field of material classes such as metals, semiconductors, polymers or porous glasses. Even though this method is
Petschke D, Helm R, Staab TEM.
europepmc   +2 more sources

Defect Studies in Thin-Film SiO₂ of a Metal-Oxide-Silicon Capacitor Using Drift-Assisted Positron Annihilation Lifetime Spectroscopy. [PDF]

Nanomaterials (Basel)
This work investigates the impact of an internal electric field on the annihilation characteristics of positrons implanted in a 180(10)nm SiO2 layer of a Metal-Oxide-Silicon (MOS) capacitor, using Positron Annihilation Lifetime Spectroscopy (PALS).
Helm R, Egger W, Corbel C, Sperr P, Butterling M, Wagner A, Liedke MO, Mitteneder J, Mayerhofer M, Lee K, Duesberg GS, Dollinger G, Dickmann M.   +12 more
europepmc   +2 more sources

Detection of atomic scale changes in the free volume void size of three-dimensional colorectal cancer cell culture using positron annihilation lifetime spectroscopy. [PDF]

PLoS One, 2014
Positron annihilation lifetime spectroscopy (PALS) provides a direct measurement of the free volume void sizes in polymers and biological systems. This free volume is critical in explaining and understanding physical and mechanical properties of polymers.
Axpe E, Lopez-Euba T, Castellanos-Rubio A, Merida D, Garcia JA, Plaza-Izurieta L, Fernandez-Jimenez N, Plazaola F, Bilbao JR.   +8 more
europepmc   +2 more sources

Effect of Free Volume on Curcumin Release from Various Polymer-Based Composite Films Analyzed Using Positron Annihilation Lifetime Spectroscopy. [PDF]

Materials (Basel), 2021
Rhim JW, Kuzeci S, Roy S, Akti N, Tav C, Yahsi U.   +5 more
europepmc   +2 more sources

Positron Annihilation Lifetime Spectroscopy as a Special Technique for the Solid-State Characterization of Pharmaceutical Excipients, Drug Delivery Systems, and Medical Devices-A Systematic Review. [PDF]

Pharmaceuticals (Basel), 2023
Shokoya MM, Benkő BM, Süvegh K, Zelkó R, Sebe I.   +4 more
europepmc   +2 more sources