• 제목/요약/키워드: Material Technology

Search Result 17,496, Processing Time 0.054 seconds

Biomimetic Preparation of Boron Nitride /PMMA Composite (생체모방기술을 이용한 Boron Nitride /PMMA 복합체 제조)

  • Nam, Kyung Mok;Lee, Yoon Joo;Kim, Bo Yeon;Kwon, Woo Teck;Kim, Soo Ryong;Shin, Dong Geun;Kim, Young Hee
    • Journal of the Korean Ceramic Society
    • /
    • v.51 no.2
    • /
    • pp.103-106
    • /
    • 2014
  • Nacre is an organic-inorganic composite material; it is composed of $CaCO_3$ platelet and protein. The microstructure of nacre is a matrix that is similar to bricks and mortar. Technology inspired by nature is called biomimetic technology. In this study, to make high thermal conducting ceramic composite materials using biomimetic technology, a porous green body was prepared with BN platelets. PMMA was infiltrated into the porous green body to make a composite. The microstructure of the composite was observed with FESEM, and the thermal properties were measured. The thermal conductivity of the prepared organic-inorganic composite was 4.19 $W/m{\cdot}K$.

Characterization of Ag Nanowire Transparent Electrode Fabricated on PVDF Film (PVDF 필름 위에 제작된 고전도도 Ag 나노와이어 투명전극 특성 연구)

  • Ra, Yong-Ho;Park, Hyelim;An, Soyeon;Kim, Jin-Ho;Jeon, Dae-Woo;Kim, SunWoog;Lee, Mijai;Hwang, Jonghee;Lim, Tae Young;Lee, YoungJin
    • Journal of Sensor Science and Technology
    • /
    • v.28 no.6
    • /
    • pp.366-370
    • /
    • 2019
  • In this study, we have successfully fabricated a highly conductive transparent electrode using Ag nanowires, based on piezoelectric polyvinylidene difluoride (PVDF) film, that can be applied as transparent and flexible speakers. The structural morphology of the Ag nanowires was confirmed by a detailed scanning electron microscopy. Ultraviolet-visible spectroscopy demonstrated that the transparent electrode fabricated by the Ag nanowires exhibited a transmittance of above 70%. The transparent electrode also showed very low sheet resistance with high flexibility. We have further developed an anti-oxidation coating layer by using a tetraethyl orthosilicate-poly trimethyloxyphenylsilane (TEOS-PTMS) slurry technique. It was confirmed that the transmittance and sheet resistance of the antioxidant film depends critically on the humidity of the film surface. We believe such Ag nanowire electrodes are a very promising next-generation transparent electrode technology that can be used in future flexible and transparent devices.

Impact of the homogenization models on the thermoelastic response of FG plates on variable elastic foundation

  • Rachedi, Mohamed Ali;Benyoucef, Samir;Bouhadra, Abdelhakim;Bouiadjra, Rabbab Bachir;Sekkal, Mohamed;Benachour, Abdelkader
    • Geomechanics and Engineering
    • /
    • v.22 no.1
    • /
    • pp.65-80
    • /
    • 2020
  • This paper presents a theoretical investigation on the response of the thermo-mechanical bending of FG plate on variable elastic foundation. A quasi-3D higher shear deformation theory is used that contains undetermined integral forms and involves only four unknowns to derive. The FG plates are supposed simply supported with temperature-dependent material properties and subjected to nonlinear temperature rise. Various homogenization models are used to estimate the effective material properties such as temperature-dependent thermoelastic properties. Equations of motion are derived from the principle of virtual displacements and Navier's solution is used to solve the problem of simply supported plates. Numerical results for deflections and stresses of FG plate with temperature-dependent material properties are investigated. It can be concluded that the proposed theory is accurate and simple in solving the thermoelastic bending behavior of FG thick plates.