Microstructure and Mechanical Properties of Platinum Fiber Fabricated by Unidirectional Solidification

Yokota, Yuui; Nihei, Takayuki; Yoshino, Masao; Yamaji, Akihiro; Toyoda, Satoshi; Sato, Hisako; Ohashi, Yuji; Kurosawa, Shunsuke; Kamada, Kei; Yoshikawa, Akira

doi:10.3390/cryst10030216

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…This can be attributed to the fact that the crystal size of metallic Ag (atomic radius = 0.1442 nm) is larger than that of metallic Pt (atomic radius = 0.1398 nm). 66 Generally, smaller crystal sizes lead to broader diffraction peaks and a shift to the left in the 2θ angle because smaller crystals have fewer diffraction planes, which leads to a decrease in the interplanar spacing. 67 Hence, the lattice of the Ag matrix contracts when metallic Pt atoms are diffused into the Ag matrix.…”

Section: Resultsmentioning

confidence: 99%

“…However, compared to the original AgNWs, the positions of all of the diffraction peaks in Pt-AgNWs, such as Ag(111), Ag(200), Ag(220), and Ag(311), reflection peaks shift (≈0.22°) toward a lower angle (inset in Figure f). This can be attributed to the fact that the crystal size of metallic Ag (atomic radius = 0.1442 nm) is larger than that of metallic Pt (atomic radius = 0.1398 nm) . Generally, smaller crystal sizes lead to broader diffraction peaks and a shift to the left in the 2θ angle because smaller crystals have fewer diffraction planes, which leads to a decrease in the interplanar spacing .…”

Section: Resultsmentioning

confidence: 99%

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Flexible Dry Epidermal Electrophysiological Electrodes Based on One-Dimensional Platinum-Coated Silver Nanowires

Liu,

Zhou,

Zeng

et al. 2023

ACS Appl. Nano Mater.

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Electrodes or sensors based on silver nanowires (AgNWs) are gaining increasing value in diverse fields such as health monitoring, smart devices, body movement monitoring, and biomedical applications. However, pure AgNWs tend to degrade over time when exposed to an ambient atmosphere, severely limiting the mechanical and electrical performances of AgNW-based electrodes. Here, we take AgNWs and poly(dimethylsiloxane) (PDMS) as the basic research materials and employ a simple displacement reaction and spin-coating process to prepare one-dimensional platinum-coated AgNWs/PDMS (Pt-AgNWs/PDMS) flexible electrodes. The as-prepared electrodes display comparable electrical conductivity (∼1.65 S/cm), stability (40 min of continuous ultrasound), and flexibility (2500 repetitions of cyclic stretching) compared to pure AgNWs/PDMS electrodes. The resistance even remains consistent at the initial state after 12000 s in a H2SO4 etching medium, indicating that the anticorrosive property of Pt can further enhance the durability and stability of the electrodes. Moreover, the low contact impedance (33.1 kΩ at 1 kHz) of Pt-AgNWs/PDMS electrodes facilitates the capture of various physiological signals, including electrooculogram (EOG), electrocardiogram (ECG), and electromyogram (EMG), which is suitable for applications requiring stable long-term recording. Thus, the proposed strategy shows potential, and Pt-AgNWs are expected to be an ideal material for the fabrication of next-generation high-performance epidermal electrophysiological electrodes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Flexible Dry Epidermal Electrophysiological Electrodes Based on One-Dimensional Platinum-Coated Silver Nanowires

Liu,

Zhou,

Zeng

et al. 2023

ACS Appl. Nano Mater.

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“…In order to solve the problem, we have developed a growth method of alloy wire materials named alloy-micro-pullingdown (A-μ-PD) method. 5) Using this method, we succeeded in developing platinum fibers 6,7) and flexible Ir/Ir-Rh wires. [8][9][10] When the wires are applied to spark plugs, thermocouples, etc, defects such as voids inside the wires can cause problems.…”

Section: Introductionmentioning

confidence: 99%

Acoustic properties for Ga–Sn–Zn liquid metal coupler with low melting point and high acoustic impedance

Ohashi¹,

Murakami²,

Yamaguchi³

et al. 2023

Jpn. J. Appl. Phys.

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Acoustic properties of Ga-Sn-Zn (GSZ) liquid alloy coupler with high acoustic impedance were investigated to evaluate materials with high acoustic impedance. GSZ liquid alloy was prepared and its longitudinal wave velocity and attenuation coefficient were measured using the plane-wave ultrasonic material characterization (PW-UMC) system. Density of the GSZ liquid alloy was also measured by a constant volume expansion method. The acoustic impedance of the GSZ was 12 times higher than that of the water. Attenuation coefficient of GSZ is much smaller than that of water, exhibiting 7.6 dB/mm for water and 0.5 dB/mm for GSZ at 200 MHz. Considering the reflection and transmission coefficients at each medium boundary calculated from the experimentally obtained acoustic impedance, it was suggested that the amplitude of the reflected wave from the back surface of the Ir sample can be made about 30 times larger with the GSZ coupler than with the water coupler.

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“…In the pre‐experimental tests, the melt of CCM alloys showed low wetting of the ZrO 2 and Al 2 O 3 ceramics, suggesting that the diameter of CCM crystal fibers can be controlled by a hole in the crucible. [ 34,35,38,39 ]…”

Section: Introductionmentioning

confidence: 99%

Growth, Microstructure, and Mechanical Properties of Co–Cr–Mo Crystal Fibers Fabricated from the Melt by Unidirectional Solidification

et al. 2021

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Many complicated forming processes are required to fabricate thin wires of Co–Cr–Mo (CCM) biomedical materials due to the poor workability of these materials. A novel fabrication technique for CCM crystal fibers is developed by unidirectional solidification directly from the melt using the alloy‐micro‐pulling‐down (A‐μ‐PD) method. Compared with conventional methods, the proposed technique is an innovative fabrication method for CCM alloy fibers and is characterized by low cost, time saving, and low loading. In addition, the proposed method shows potential for further thinning of fibers. At growth rates of 0.1 and 0.3 mm min−1, CCM single‐crystal fibers composed of the ε‐phase with a hexagonal close‐packed (hcp) structure (hcp ε‐phase) can be fabricated. The hcp‐ε‐phase CCM crystal fibers exhibit considerably improved strain because of the slipping line in the hcp structure. Moreover, the γ‐phase with an fcc structure (fcc γ‐phase) appears in the hcp‐ε‐phase at growth rates greater than 0.5 mm min−1, and the ratio of the fcc γ‐phase in the CCM crystal fibers systematically increases with an increase in the cooling rate. The results reveal that the growth rate in the A‐μ‐PD method has a notable effect on the fabrication of single‐ or polycrystalline CCM fibers.

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Microstructure and Mechanical Properties of Platinum Fiber Fabricated by Unidirectional Solidification

Cited by 4 publications

References 16 publications

Flexible Dry Epidermal Electrophysiological Electrodes Based on One-Dimensional Platinum-Coated Silver Nanowires

Flexible Dry Epidermal Electrophysiological Electrodes Based on One-Dimensional Platinum-Coated Silver Nanowires

Acoustic properties for Ga–Sn–Zn liquid metal coupler with low melting point and high acoustic impedance

Growth, Microstructure, and Mechanical Properties of Co–Cr–Mo Crystal Fibers Fabricated from the Melt by Unidirectional Solidification

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