Activation of NdFeB magnetic material upon exposure to oxygen plasma
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F25%3A63595763" target="_blank" >RIV/70883521:28610/25:63595763 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0169433225020550" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0169433225020550</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.apsusc.2025.164339" target="_blank" >10.1016/j.apsusc.2025.164339</a>
Alternative languages
Result language
angličtina
Original language name
Activation of NdFeB magnetic material upon exposure to oxygen plasma
Original language description
In bonded NdFeB magnets, the fillers’ adhesion in the polymer matrix of composites is often insufficient, necessitating filler wettability modification before mixing with liquid polymers. Inductively coupled radiofrequency oxygen plasma was used to modify the surface wettability of commercial NdFeB flakes. A pronounced minimum in water contact angle (WCA) was observed after approximately 100 ms of treatment in plasma (50 Pa, 500 W). A deeper minimum was observed upon treatment in the flowing afterglow. The flux of oxygen atoms on the NdFeB flakes’ surface was ∼3 × 1023 m−2 s−1, and the WCA below 20° was observed after treating the samples in the afterglow for 0.05–0.5 s; corresponding O-atom doses 1022–1023 m−2. Larger doses caused a gradual loss of hydrophilicity, and an initial WCA of ∼75° was established after treating the samples in the afterglow for ∼40 s. This was attributed to the segregation and oxidation of iron on the NdFeB surface. Thorough XPS depth profiling revealed oxidation kinetics. The treatment in the glowing plasma caused a similar evolution, except that hydrophobicity was re-established after 1-s plasma treatment. The segregation of iron on the surface caused the formation of Fe2O3, and the intermediate layer toward the bulk consisted of Nd2O3 dispersed in the Fe matrix.
Czech name
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Czech description
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Classification
Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
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Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Applied Surface Science
ISSN
0169-4332
e-ISSN
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Volume of the periodical
713
Issue of the periodical within the volume
Neuveden
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
12
Pages from-to
nestránkováno
UT code for WoS article
001694847100001
EID of the result in the Scopus database
2-s2.0-105013657020