Results 61 to 70 of about 40,261 (187)

Vacancy‐Type Defects in n‐Type GaN Fabricated by Low‐Dose Ion Implantation Studied by a Monoenergetic Positron Beam

physica status solidi (b), EarlyView.
Vacancies in low‐dose ion‐implanted GaN are studied by positron annihilation. Depth profiles of the net donor concentration (ND) are close to those for implanted impurities, but ND is 2–3 times higher than concentrations of implanted ions. The origin of donor‐like defects is expected to be N‐vacancy‐related defects, and Ga‐vacancy‐type defects play a ...
Akira Uedono, Hiroko Iguchi, Masahiro Horita, Jun Suda, Kohei Shima, Shigefusa F. Chichibu, Shoji Ishibashi   +6 more
wiley   +1 more source

Microstructure and luminescent properties of Eu3+-activated MgGa2O4:Mn2+ ceramic phosphors

Journal of Advanced Ceramics, 2020
Mn2+ and the trivalent europium (Eu3+)-doped MgGa2O4 ceramics are characterized using a multi-experimental approach. The formation of spinel-structured ceramics is ascertained from X-ray diffraction (XRD) analysis.
A. Luchechko, Y. Shpotyuk, O. Kravets, O. Zaremba, K. Szmuc, J. Cebulski, A. Ingram, R. Golovchak, O. Shpotyuk   +8 more
doaj   +1 more source

Linking Density and Nanoscale Crystallinity to Hydration in Nafion PEMFC Membranes: Insights From Experiment and Molecular Dynamics Simulations

Small Structures, EarlyView.
Molecular dynamics and experimental analysis show that higher crystallinity in Nafion enhances molecular packing, thereby increasing effective density. A proposed model bridges experimental and molecular‐scale observations by quantitatively linking water uptake to density variations, offering a predictive framework for optimising hydration and ...
Mateja Jovanović, Nicolas Bernhard, Matthias Baldofski, Marcin Rybicki, Miljan Dašić, Igor Stanković   +5 more
wiley   +1 more source

Natural rubber/styrene-butadiene rubber blends prepared by solution mixing: Influence of vulcanization temperature using a Semi-EV sulfur curing system on the microstructural properties [PDF]

, 2017
Blends of natural rubber (NR) and styrene-butadiene rubber (SBR) were prepared by solution mixing and vulcanized with sulfur and accelerator in a Semi-EV system at 433 K and 443 K in order to study the vulcanization kinetic and the influence of ...
Macchi, Carlos Eugenio, Mansilla, Marcela Angela, Marzocca, Angel José, Somoza, Alberto Horacio   +3 more
core   +1 more source

The plasticisation model of dye diffusion: Part 5

Coloration Technology, EarlyView.
Abstract The findings presented in the previous part of the paper (Part 4) of the re‐evaluation of previously published data reported for the temperature‐dependent diffusion of an organic acid within nylon 6 film, desorption of three acid dyes from dyed nylon 66 fabric, diffusion of an acid dye within nylon 6 monofilaments and adsorption of a sulphur ...
Stephen M. Burkinshaw
wiley   +1 more source

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.
Eneko Axpe, Tamara Lopez-Euba, Ainara Castellanos-Rubio, David Merida, Jose Angel Garcia, Leticia Plaza-Izurieta, Nora Fernandez-Jimenez, Fernando Plazaola, Jose Ramon Bilbao   +8 more
doaj   +1 more source

Study the structure of nanodiamonds by electron-positron annihilation after adding a certain amount of cyclic hydrogen [PDF]

, 2017
Nanodiamond samples with various densities were studied by positron annihilation spectroscopy with the aim of finding out the hydrogen saturation effect on nanodiamonds.
Гулидова, Людмила Владимировна, Лю Чао   +1 more
core  

PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix [PDF]

, 2015
The polystyrene dopped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter, prepared as a plastic scintillator was investigated using positronium probe in wide range of temperatures from 123 to 423 K ...
Bednarski, T., Białas, P., Czerwiński, E., Gajos, A., Gorgol, M., Jasińska, B., Kamińska, D., Kapłon, Ł., Kochanowski, A., Korcyl, G., Kowalski, P., Kozik, T., Krzemień, W., Kubicz, E., Moskal, P., Niedźwiecki, S., Pałka, M., Raczyński, L., Rudy, Z., Rundel, O., Sharma, N. G., Silarski, M., Strzelecki, A., Słomski, A., Wieczorek, A., Wiślicki, W., Zgardzińska, B., Zieliński, M.   +27 more
core   +2 more sources

Commissioning of the J-PET detector in view of the positron annihilation lifetime spectroscopy [PDF]

Hyperfine Interactions, 2018
The Jagiellonian Positron Emission Tomograph (J-PET) is the first PET device built from plastic scintillators. It is a multi-purpose detector designed for medical imaging and for studies of properties of positronium atoms in porous matter and in living ...
K. Dulski, C. Curceanu, E. Czerwiński, A. Gajos, M. Gorgol, N. Gupta-Sharma, B. Hiesmayr, B. Jasińska, K. Kacprzak, Ł. Kapłon, D. Kisielewska, K. Klimaszewski, G. Korcyl, P. Kowalski, N. Krawczyk, W. Krzemień, T. Kozik, E. Kubicz, M. Mohammed, S. Niedźwiecki, M. Palka, M. Pawlik-Niedzwiecka, L. Raczyński, J. Raj, K. Rakoczy, Z. Rudy, Sushil Sharma, Shivani, R. Shopa, M. Silarski, M. Skurzok, W. Wiślicki, B. Zgardzińska, P. Moskal   +33 more
semanticscholar   +1 more source

Molecular Cages Based Materials for CO2 Capture, Separation, and Conversion

EcoMat, Volume 8, Issue 2, February 2026.
Molecular cages (MCs), boasting soluble, regenerable traits and precisely tunable structures, exhibit substantial potential for efficient CO2 capture, separation, and conversion. This review thoroughly explores MCs' recent advancements, analyzes current unresolved challenges, and provides forward‐looking perspectives to tackle pressing carbon‐related ...
Ding Zou, Bin Ai, Yanni Zhang, Xiaoyu Cao, Hongyu Zhen   +4 more
wiley   +1 more source