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RISS 인기검색어
- 검색키워드
- 저자 : Alanizy, Maleeha (검색결과 2 건)
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Oxygen storage properties of hexagonal HoMnO<sub>3+δ</sub>
Ś,wierczek, Konrad,Klimkowicz, Alicja,Nishihara, Kengo,Kobayashi, Shuntaro,Takasaki, Akito,Alanizy, Maleeha,Kolesnik, Stanislaw,Dabrowski, Bogdan,Seong, Seungho,Kang, Jeongsoo The Royal Society of Chemistry 2017 Physical chemistry chemical physics Vol.19 No.29
<▼1><P>Structural and oxygen content changes of hexagonal HoMnO3+δ manganite at the stability boundary in the perovskite phase have been studied by X-ray diffraction and thermogravimetry using <I>in situ</I> oxidation and reduction processes at elevated temperatures in oxygen and air.</P></▼1><▼2><P>Structural and oxygen content changes of hexagonal HoMnO3+δ manganite at the stability boundary in the perovskite phase have been studied by X-ray diffraction and thermogravimetry using <I>in situ</I> oxidation and reduction processes at elevated temperatures in oxygen and air. The oxygen storage properties during structural transformation between stoichiometric Hex0 and oxygen-loaded Hex1 phases, transition temperatures and kinetics of the oxygen incorporation and release are reported for materials prepared by the solid-state synthesis and high-impact mechanical milling. Long-term annealing experiments have shown that the Hex0 (<I>δ</I> = 0) → Hex1 (<I>δ</I> ≈ 0.28) phase transition is limited by the surface reaction and nucleation of the new phase for HoMnO3+δ 15MM. The temperatures of Hex0 ↔ Hex1 transitions have been established at 290 °C and 250 °C upon heating and cooling, respectively, at a rate of 0.1° min<SUP>−1</SUP>, also indicating that the temperature hysteresis of the transition could possibly be as small as 10 °C in the equilibrium. Ball-milling of HoMnO3+δ has only a small effect on improving the speed of the reduction/oxidation processes in oxygen, but importantly, allowed for considerable oxygen incorporation in air at a temperature range of 220–255 °C after prolonged heating. The Mn 2p XAS results of the Mn valence in oxygen loaded samples support the oxygen content determined by the TG method. The magnetic susceptibility data of the effective Mn valence gave inconclusive results due to dominating magnetism of the Ho<SUP>3+</SUP> ions. Comparison of HoMnO3+δ with previously studied DyMnO3+δ indicates that a tiny increase in the ionic size of lanthanide has a huge effect on the redox properties of hexagonal manganites and that practical properties could be significantly improved by synthesizing the larger average size (Y,Ln)MnO3+δ manganites.</P></▼2>
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Prototyping the Flexible Solenoid-Coil Artificial Muscle, for Exoskeletal Robots
Asuka Takai,Nouf Alanizi,Kazuo Kiguchi,Thrishantha Nanayakkara 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
Design approaches to exoskeletal robots traditionally aimed to achieve mechanical forces many times larger than the level achievable by the corresponding natural musculoskeletal system. This has often obstructed the user’s muscles during physical rehabilitation. Moreover, mechanisms designed for excessive force generation are heavy and rigid structures with little compliance and thus are not suitable for many mobile applications. Here, we present a novel biomimetic flexible solenoid-coil artificial muscle (FSAM) fibre with inherent mechanical compliance, a high pulling stroke, and structural flexibility that suit a lightweight wearable exoskeletal robot for rehabilitation use. FSAM consists of a chain of specially designed bobbins of solenoid coils that can slide against each other. The chain allows FSAM to form an arch shape when the coils are energized; this is reminiscent of a natural muscle that bends a joint by a combined contraction of the muscle length and bending in an arch shape. This strategy of bending a joint not only reduces the need for linear contraction but also allows the exoskeletal to be compliant with the contraction morphology of natural muscle.
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