Results 41 to 50 of about 1,771,729 (203)

Positron Annihilation Spectroscopy in Materials and Technical Details of Measurement Systems [PDF]

فصلنامه علوم و فناوری فضایی, 2013
Being a very powerful method, Positron Annihilation Spectroscopy (PAS) has been widely used for investigation of defects type and concentration in materials in recent years.
A. A. Mehmandoost-Khajeh-Dad, M. Khaghani, M. Jafarzadeh-Khatibani   +2 more
doaj  

Positron annihilation lifetime spectroscopy study of roller burnished magnesium alloy

Nukleonika, 2015
The effect of roller burnishing on Vickers’ hardness and positron lifetimes in the AZ91HP magnesium alloy was studied. The microhardness increases with an increase in the burnishing force and with a decrease in the feed. The comparison of various methods
Zaleski Radosław, Zaleski Kazimierz, Gorgol Marek   +2 more
doaj   +1 more source

On the positron annihilation spectroscopy and tensile behavior of COOH-MWCNT/epoxy nanocomposites [PDF]

Journal of Particle Science and Technology
Positron Annihilation Lifetime Spectroscopy (PALS) is sensitive to the material voids/free volume on the atomic scale. For this reason, this method has been used as a unique technology to measure the free volume and structural defects in polymers in ...
Mohammad Koohkan, Ali Akbar Mehmandoost Khajeh-Dad, Hamed Khosravi   +2 more
doaj   +1 more source

Application Progress of PALS in the Correlation of Structure and Properties for Graphene/Polymer Nanocomposites

Nanomaterials, 2022
Giving a deep insight into the microstructure, and realizing the correlation between microstructure and properties is very important to the precise construction of high-performance graphene/polymer nanocomposites (GPN).
Xiaobing Han, Jie Gao, Tao Chen, Libing Qian, Houhua Xiong, Zhiyuan Chen   +5 more
doaj   +1 more source

Ultrathin Amphipathic Dual‐Polymer Networks: Unlocking Hyper‐Permeable CO2 Capture via Solvent‐Mediated Poly(Ethylene Oxide) Amorphization

Advanced Functional Materials, EarlyView.
Hydrophilic PEO‐copolymers and hydrophobic PDMS are physically integrated via a compatibilizing solvent into an amphipathic dual‐polymer network with versatile interfacial affinity and completely amorphized PEO segments for hyper‐permeable CO2 transport.
Ji Wu, Fan Feng, Baiwang Zhao, Jordan Yuan Zhe Ng, Kaiyu Wang, Can Zeng Liang, Guangtai Zheng, Boxuan Zhao, Tai‐Shung Chung, Sui Zhang   +9 more
wiley   +1 more source

Positronium Annihilation Lifetime Spectroscopy Study of SBA-15 [PDF]

, 2010
Positronium annihilation lifetime spectroscopy (PALS) is a technique used in the characterization of porosity in nanostructured materials. Positrons, the antiparticle to the electron, enter a sample and either immediately annihilate with an electron or ...
Tracy K. Steinbach, Steinbach, Tracy K
core  

Electron Positron Annihilation Lifetime Spectroscopy/An Introduction for Union College

, 2021
This experiment crafted an electron-positron annihilation spectrometer in order to conduct electron-positron annihilation lifetime spectroscopy (EPALS) in the Union College Ion Beam Analysis Laboratory.
Feinstein, Jacob
core  

Distribution of Positron Annihilation Lifetime Components

مجلة بغداد للعلوم, 2008
The intensities of the positron annihilation lifetime components are shown to be related to the free volume model, and the theoretical value of the ratio between the singlet to the triplet state intensities, described by the ratio η, is shown to follow ...
Ahmed Abdul-Razzaq Selman, Muna Ahmed Saeed   +1 more
doaj   +1 more source

Beyond Nanoporosity: A CO2‐Conditioned Glassy Matrix Contributes to the Brittle‐to‐Ductile Transition of Nanocellular Polyetherimide

Advanced Materials, EarlyView.
The mechanical performance of nanocellular polyetherimide cannot be explained by nanoporosity alone. It is shown that CO2 saturation and desorption leave a distinct mechanical signature in the glassy matrix before foaming. This matrix contribution provides a new route to understand and optimize the brittle to ductile transition in nanocellular polymers.
Félix Lizalde‐Arroyo, Frederik Van Loock, Victoria Bernardo, Tuuli Peltola, René Bes, Alberto Tena, Miguel Ángel Rodríguez‐Pérez, Judith Martín‐de León   +7 more
wiley   +1 more source

Nanocrystalline aluminum studied by positron annihilation lifetime spectroscopy

Acta Physica Sinica, 2014
Aluminum nanoparticles with an average diameter of about 48 nm are compressed in a cemented-carbide mold under different pressures to produce nanocrystalline aluminum by the hot-pressing technology in a high vacuum condition. The X-ray diffraction and the positron annihilation lifetime spectroscopy (PALS) are used to characterize the microscopic ...
null Li Yu, null Luo Jiang-Shan, null Wang Zhu, null Yang Meng-Sheng, null Xing Pi-Feng, null Yi Yong, null Lei Hai-Le   +6 more
openaire   +1 more source