正負スイッチングパルス電場配向によるファインピッチコネクタ材料の創製

• Project/Area Number: 25420773
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Nagaoka University of Technology
• Principal Investigator: 趙 洪栢 長岡技術科学大学, 工学(系)研究科(研究院), 准教授 (70637272)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Discontinued (Fiscal Year 2015)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 高密度実装 / セラミックス / 複合材料．物性 / 電子．電気材料 / 無機工業化学 / フィラー内部構造解析 / 三次元構造解析 / 電子基盤ファインピッチコネクタ / 電界集中効果 / 電子ビームリソグラフィ / フィアラー内部構造制御装置 / パルス電場によるフィラー配向技術 / 有機物/導電性粒子ハイブリット

Outline of Annual Research Achievements

小型携帯端末中のファインピッチコネクタに着目し、２０２０年頃まで使われる予定のイーサーネット規格動作が可能で更に小型化を推進できるフレキシブル基板対応型のファインピッチコネクタを実現するための材料構造設計とそれを達成するためのプロセス開発と試作を行うことを目的として研究を行った。基本的にはエラストマーマトリックス中に異方性状からなる銀ナノフィラーを複合化し、これに申請者らが世界で初めて実証に成功した正負スイチングパルス電場配向手法を適用することにより、膜の裏から表までフィラーが数珠つなぎで貫通しているようなナノピラー構造を形成させた。このことで、いわば「第４世代」というべきファインピッチコネクタをモデル材料とし、ナノ秒パルス電場という異分野の手法による有機物系ハイブリッド材料の高度な合成プロセスを開発した。
具体的には２５年度には新規フィラー内部構造制御装置への蔵置改造を行った。パルス電場によるフィラー配向技術の異なる改善においては、膜の表と裏に設置した電極に対し、正負の電極を絶えずスイチしながら印加する手法を用いることにより、有機物マトリックス中で導電性フィラーが上下し、分離凝集することによって、膜面を貫通するような形態で導電性フィラーの柱状構造（ピラー構造）を形成すくとができた。これらの電導性フィラーの凝集によるピラー構造の位置、直径、間隔制御のための電極構造デザインの設計に成功した。
２６～２７年度には得られた材料の内部構造とファインピッチコネクタ用材料としての優位性検証を行った。ファインピッチコネクタ材料の合成と構造および基本物性評価し、得られた材料の内部構造が人工的に付与さらた電極表面上の突起部に電界集中の効果によって狙ったとおりのフィラーに構造が形成されていることを確認した。さらに、コネクタ材料の 総合的な電気特性検討を行い、本プロセスの優位性を実証した。

Research Products

• [Journal Article] Effective gene delivery into adipose-derived stem cells: transfection of cells in suspension using a nuclear localization signal peptide-conjugated polyethylenimine (2015)
  • Author(s): Eulsoon Park, Hong-Baek Cho, Koichi Takimoto
  • Journal Title: Cytotherapy Volume: 17 Issue: 5 Pages: 536-542
  • DOI: 10.1016/j.jcyt.2014.11.008
  • Peer Reviewed / Open Access
• [Journal Article] Synthesis of molten-metal corrosion resistant yttria-based refractory by hot-pressing and densification (2014)
  • Author(s): Nguyen, S.T.a , Nakayama, T.a , Suematsu, H.a, Suzuki, T.a, Nanko, M.b, Cho, H.-B.a, Huynh, M.T.T.a, Jiang, W.a, Niihara, K.
  • Journal Title: Journal of the European Ceramic Society Volume: n Issue: 9 Pages: 2651-2662
  • DOI: 10.1016/j.jeurceramsoc.2015.02.023
  • Peer Reviewed / Open Access
• [Journal Article] The effect of Mo addition on the microstructural evolution and mechanical properties of Zr-Cu-based metallic glass thin films (2014)
  • Author(s): Jung Ho Shin, Doo-In Kim, Hong-Baek Cho, Do Hyung Kim, Hisayuki Suematsu* and Kwang Ho Kim
  • Journal Title: Journal of Ceramic Processing Research Volume: 15 Pages: 130-135
  • Peer Reviewed / Open Access
• [Journal Article] Internal structure control of the TiO2 nanotubes and polysiloxane nanocomposites by nanosecond pulsed electric field (2014)
  • Author(s): Ji-Won Lee, Hong-Baek Cho*, Tadachika Nakayama, Tohoru Sekino, Tsuneo Suzuki, Hisayuki Suematsu, Koichi Niihara
  • Journal Title: Journal of Asian Ceramic Societies Volume: 2 Issue: 2 Pages: 97-101
  • DOI: 10.1016/j.jascer.2014.02.004
  • Peer Reviewed / Open Access
• [Journal Article] Three-dimensional structural control and analysis of hexagonal boron nitride nanosheets assembly in nanocomposite films induced by electric field concentration (2014)
  • Author(s): Fujihara, T., Cho, H.-B. , Kanno, M., Nakayama, T. , Suzuki, T., Jiang, W., Suematsu, H., Niihara, K.
  • Journal Title: Japanese Journal of Applied Physics Volume: 53 Issue: 2S Pages: 02BD12-02BD12
  • DOI: 10.7567/jjap.53.02bd12
  • NAID: 210000143382
  • Peer Reviewed / Open Access
• [Journal Article] Particle size determining equation in metallic nanopowder preparation by pulsed wire discharge (2013)
  • Author(s): Tokoi, Y., Cho, H.-B., Suzuki, T., Nakayama, T., Suematsu, H., Niihara, K.
  • Journal Title: Japanese Journal of Applied Physics Volume: 52 Issue: 5R Pages: 55001-55001
  • DOI: 10.7567/jjap.52.055001
  • NAID: 210000142166
  • Peer Reviewed
• [Journal Article] Thermal anisotropy of epoxy resin-based nano-hybrid films containing BN nanosheets under a rotating superconducting magnetic field (2013)
  • Author(s): Hong-Baek Cho*, Masaya Mitsuhashi, Tadachika Nakayama, Satoshi Tanaka, Tsuneo Suzuki, Hisayuki Suematsu, Weihua Jiang, Yoshinori Tokoi, Soo Wohn Lee, Yeung-Ho Park, Koichi Niihara
  • Journal Title: Materials Chemistry and Physics Volume: １３９ Issue: 2-3 Pages: 355-359
  • DOI: 10.1016/j.matchemphys.2013.01.063
  • Peer Reviewed
• [Journal Article] Oxidation of nanodiamonds and modulation of their assembly in polymer-based nanohybrids by field-inducement (2013)
  • Author(s): Cho, H.-B., Nguyen, S.T., Nakayama, T., Huynh, M.T.T., Suematsu, H., Suzuki, T., Jiang, W., Rozali, S.B., Tokoi, Y., Park, Y.-H., Niihara, K.
  • Journal Title: Journal of Materials Science Volume: 48 Issue: 12 Pages: 4151-4162
  • DOI: 10.1007/s10853-013-7228-6
  • Peer Reviewed
• [Journal Article] Densely packed linear assembles of carbon nanotube bundles in polysiloxane-based nanocomposite films (2013)
  • Author(s): Cho, H.-B., Huynh, M.T.T., Nakayama, T., Nguyen, S.T., Suematsu, H., Suzuki, T., Jiang, W., Tanaka, S., Tokoi, Y., Lee, S.W., Sekino, T., Niihara, K.
  • Journal Title: Journal of Nanomaterials Volume: 2013 Issue: 1 Pages: 5643071-6
  • DOI: 10.1155/2013/564307
  • Peer Reviewed
• [Journal Article] Controlled linear assemblies of graphite flakes anchoring polysiloxane-based nanocomposite films and enhancement of thermal properties (2013)
  • Author(s): H.B. Cho
  • Journal Title: Japanese Journal of Applied Physics Volume: 52 Issue: 2R Pages: 306-313
  • DOI: 10.7567/jjap.52.028005
  • Peer Reviewed
• [Journal Article] Effect of h-BN Nanosheets Codeposition on Electrochemical Corrosion Behavior of Electrodeposited Nickel Composite Coatings (2013)
  • Author(s): Gobinda Gyawali, Rajesh Adhikari, Hyung Suk Kim, Hong-Baek Cho, Soo Wohn Lee
  • Journal Title: ECS Electrochemistry Letters Volume: ３
  • Peer Reviewed
• [Journal Article] Preparation of copper nanoparticles by pulsed wire discharge in water (2013)
  • Author(s): Tokoi, Y., Nagasawa, S., Suematsu, H., Cho, H.-B., Nakayama, T., Niihara, K.
  • Journal Title: Materials Science Forum Volume: 761 Pages: 121-124
  • DOI: 10.4028/www.scientific.net/msf.761.121
  • Peer Reviewed
• [Journal Article] Linear assembly of oxidized surface treated nanodiamonds in polymer-based nanohybrids by electric field inducement (2013)
  • Author(s): Nguyen, S.T., Cho, H.-B., Nakayama, T., Huynh, M.T.T., Suematsu, H., Suzuki, T., Jiang, W., Tanaka, S., Tokoi, Y., Niihara, K.
  • Journal Title: Materials Science Forum Volume: 761 Pages: 107-111
  • DOI: 10.4028/www.scientific.net/msf.761.107
  • Peer Reviewed
• [Presentation] Polyvinylidene fluoride-based Polymer Nanocomposites with Anisotropic Orientation of Exfoliated Boron Nitride Nanosheets (2015)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama*, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang, Koichi Niihara, Dae Yong Jeong
  • Organizer: The 4th International GIGAKU Conference in Nagaoka (IGCN 2015)
  • Place of Presentation: Nagaoka, Niigata, Japan
  • Year and Date: 2015-06-19
• [Presentation] Pin-point Localization of Boron Nitride Assembly in Hybrid Nanocomposites by Electric Field Concentration (2015)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang, Koichi Niihara
  • Organizer: Annual Meeting of The Ceramic Society of Japan
  • Place of Presentation: Okyama University (Tsushima Campus)
  • Year and Date: 2015-03-18 – 2015-03-20
• [Presentation] Insulating Thermal Diffusion Routes by Boron Nitride ceramics in Polymer-nanocomposites (2015)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang, Koichi Niihara
  • Organizer: International Symposium on Hybrid Nano Materials Toward Future Industries (HNM 2015)
  • Place of Presentation: Nagaoka University of Technology
  • Year and Date: 2015-02-09 – 2015-02-10
• [Presentation] Three-Dimensional Structural control of insulating BN assembles in Polymer-nanocomposites (2014)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang, Koichi Niihara
  • Organizer: The 31st International Korea-Japan Seminar on Ceramics
  • Place of Presentation: Changwon
  • Year and Date: 2014-11-26 – 2014-11-29
• [Presentation] Insulating Polymer-nanocomposites with Incorporation of 3-D Controlled Boron Nitride Nanosheets Assembly (2014)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang and Koichi Niihara
  • Organizer: MS&T14, Materials Science & Technology 2014 Conference & Exhibition
  • Place of Presentation: Pittsburgh
  • Year and Date: 2014-10-12 – 2014-10-16
• [Presentation] Exfoliation and Functionalization of BN nanosheets for the Enhancement of Thermal Conducting Properties of Polymer-nanocomposites (2014)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang and Koichi Niihara
  • Organizer: The 38th ICACC
  • Place of Presentation: Hilton Daytona Beach Resort and Ocean Center, Florida, USA
• [Presentation] Densely-Packed Linear Assembles of BN nanosheets in Polymeric Nanocomposites (2013)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang and Koichi Niihara
  • Organizer: The 5th Asia-Oceania Ceramic Federation (AOCF) Conference
  • Place of Presentation: Jeju, KOREA
• [Presentation] Effects of Exfoliation and Functionalization of BN Nanosheets for thermal conducting polymer nanocomposites (2013)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihwa Jiang, Koichi Niihara
  • Organizer: 8th NANOSMAT
  • Place of Presentation: Granada (SPAIN)
• [Presentation] Selective functionalization of Boron Nitride Nanosheets for Thermal Conducting Polymer Nanocomposites (2013)
  • Author(s): Hong-Baek Cho*, Tadachika Nakayama, Hisayuki Suematsu, Tsuneo Suzuki, Weihwa Jiang, Koichi Niihara
  • Organizer: The 2nd International GIGAKU Conference in Nagaoka
  • Place of Presentation: Niigata, JAPAN