A dramatic improvement in the tensile strength of fullerene needle-like crystals

Toshio Konno; Takatsugu Wakahara; Kun'ichi Miyazawa; Kazuhiro Marumoto

doi:10.1016/S1872-5805(18)60341-5

Volume 33 Issue 4

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Toshio Konno, Takatsugu Wakahara, Kun'ichi Miyazawa, Kazuhiro Marumoto. A dramatic improvement in the tensile strength of fullerene needle-like crystals. New Carbon Mater., 2018, 33(4): 310-315. doi: 10.1016/S1872-5805(18)60341-5

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Toshio Konno, Takatsugu Wakahara, Kun'ichi Miyazawa, Kazuhiro Marumoto. A dramatic improvement in the tensile strength of fullerene needle-like crystals. New Carbon Mater., 2018, 33(4): 310-315. doi: 10.1016/S1872-5805(18)60341-5

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A dramatic improvement in the tensile strength of fullerene needle-like crystals

doi: 10.1016/S1872-5805(18)60341-5

1.
Division of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan;
2.
National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;
3.
Imaging Section(IMG), Okinawa Institute of Science and Technology Graduate University(OIST), 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0495, Japan;
4.
Tsukuba Research Center for Interdisciplinary Materials Science(TIMS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan

Received Date: 2018-05-10
Accepted Date: 2018-08-30
Rev Recd Date: 2018-07-28
Publish Date: 2018-08-28

Abstract

Abstract

Needle-like crystals consisting of a solid solution of C₆₀-C₇₀ fullerene were synthesized by a liquid-liquid interfacial precipitation method using toluene and 2-propanol as solvents. A machined crystal with a V-notch was placed in a focused ion beam scanning electron microscope where it was bent until fracture by pushing it with a molybdenum probe to measure its mechanical properties and its fracture surface was examined. The crystals had a tensile strength of 58-71 MPa, which is much higher than C₆₀ fullerene needle-like crystals and slightly larger than alumina, and a fracture toughness of 1.1-1.3 MPa m^1/2. Moreover, it is possible to change the plasticity and fracture toughness of the C₆₀-C₇₀ crystals by solvation of different numbers of fullerene molecules. The C₆₀-C₇₀ fullerene crystals have the potential for use as electrodes, anchors for brittle materials, and ductile wires to carry electricity.
- Fullerene nanowhisker,
- Solid solution,
- Liquid-liquid interfacial precipitation,
- Tensile strength,
- Fracture toughness

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