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    Home > Chemicals Industry > New Chemical Materials > Liquid metal Galinstan has many peculiar properties

    Liquid metal Galinstan has many peculiar properties

    • Last Update: 2021-06-17
    • Source: Internet
    • Author: User
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      The liquid metal robot "T-1000" in the movie "Terminator" series shows the unique characteristics of liquid metal: it has liquid fluidity, high strength of metal, and can repair itself after injury
    .
    In reality, the liquid metal Galinstan (a eutectic alloy of Ga and In) not only has these peculiar properties, but also has excellent electrical properties (34,000 S·cm-1), thermodynamic properties, etc.
    , so it has Very important application prospects

    .

      The Liang Jiajie team from the School of Materials Science and Engineering of Nankai University published their research results "Rupture stress of liquid metal nanoparticles and their applications in stretchable conductors and dielectrics" on npj Flexible Electronics
    .
    The team prepared liquid metal nanoparticles of different sizes by controlling the ultrasound time.
    The particles have a special core-shell structure, including an internal highly conductive liquid metal and an external insulating oxide Ga2O3 (Figure 1a)

    .
    When the external stress is greater than the crushing stress of the insulating oxide, the liquid metal particles are broken and fused, forming abundant conductive paths inside the material

    .
    When the external stress is less than the breaking stress of the insulating oxide, the liquid metal particles remain intact, which improves the dielectric constant and capacitance performance of the composite material (Figure 1b)

    .
    Through research, it is found that as the size of liquid metal nanoparticles increases, the crushing stress gradually decreases (Figure 1c).
    The theoretical calculation and experimental verification of the crushing stress of liquid metal nanoparticles of different sizes are carried out (Figure 1d, e)

    .

      Figure 1.
    (a) Preparation process and core-shell structure of liquid metal nanoparticles

    .
    (b) Schematic diagram of the working principle of LMNPs-1.
    4 and LMNPs-0.
    3 used to prepare stretchable electrodes and stretchable insulating materials, respectively

    .
    (c) The relationship between crushing stress and diameter of liquid metal nanoparticles

    .
    (d) Experimental and theoretical values ​​of crushing strain of 50%LMNPs-1.
    4/85PU and 50%LMNPs-0.
    3/85PU

    .
    (e) Experimental and theoretical values ​​of crushing strain of 50%LMNPs-1.
    4/65PU and 50%LMNPs-0.
    3/65PU

    .

      Under the guidance of theoretical calculation results, the team used large-size liquid metal particles with low crushing stress to compound with high modulus elastomers, and the prepared stretchable electrode had an initial conductivity of 11,702 S·cm-1.
    As the strain increases, the conductivity gradually rises.
    Under 400% strain, the conductivity is 24,130 S∙cm-1, and the resistance change is independent of the stretching speed.
    The electrode is cyclically stretched 20,000 times under 300% strain, and the resistance change remains stable ( Figure 2a-c)

    .
    Using small size liquid metal particles with high crushing stress and low modulus elastomer composite, the dielectric constant of the prepared insulating material is 76.
    8, the working range is 580%, and the resistance changes during repeated stretching 1,000 times under 100% strain Keep it stable (Figure 2d-f)

    .

      Figure 2.
    (a) The relationship between the electrical conductivity and tensile strain of 85%LMNPs-1.
    4/85PU in the tensile state, (b) the experimental data fitting, (c) 85%LMNPs-1.
    4/85PU at 300% strain, The resistance changes during 20,000 cycles at different speeds (0.
    12 Hz, 0.
    16 Hz, 0.
    24 Hz, 0.
    30 Hz, and 0.
    01 Hz)

    .
    (d) The dielectric constant of LMNPs-0.
    3/55PU with different amounts of liquid metal added at a frequency of 100 kHz

    .
    (e) In the frequency range of 10-100 kHz, the capacitance change of 50% LMNPs-0.
    3/55PU under different strains

    .
    (f) The capacitance and loss of 50% LMNPs-0.
    3/55PU change during 1,000 times of stretching at 100% strain

    .


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