表面科学
Online ISSN : 1881-4743
Print ISSN : 0388-5321
ISSN-L : 0388-5321
38 巻 , 3 号
選択された号の論文の11件中1~11を表示しています
巻頭言
特集: 摩擦界面のその場観察技術の進展
  • 三宅 晃司
    原稿種別: 企画趣旨
    2017 年 38 巻 3 号 p. 104
    発行日: 2017/03/10
    公開日: 2017/03/24
    ジャーナル フリー
  • 佐藤 隆昭, 藤田 博之
    原稿種別: 研究紹介
    2017 年 38 巻 3 号 p. 105-110
    発行日: 2017/03/10
    公開日: 2017/03/24
    ジャーナル フリー

    The real time observation of nanoscale deformation is a significant step toward understanding the mechanisms of friction, wear and lubrication. Our experimental system of a micromachine combined with a TEM enabled us to measure the deformation, force and actual contact area of a single Ag and Fe asperity. The experimental results provided insight into one of the parameters that determines the frictional coefficient. Furthermore, we demonstrated that the energy loss associated with a separation event is correlated with the increase in total surface energy of the two surfaces formed here after the separation of the nano-contact.

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  • 中野 健, 田所 千治, 前川 覚
    原稿種別: 研究紹介
    2017 年 38 巻 3 号 p. 111-116
    発行日: 2017/03/10
    公開日: 2017/03/24
    ジャーナル フリー

    Optical interference is one of the most powerful tools for lubrication studies, since it enables in-situ measurements of lubricant film thickness under practical conditions. After various improvements, optical interferometry has been developed to apply not only to thick (e.g., micrometer-scale) films in hydrodynamic lubrication regime but also to thin (e.g., nanometer-scale) films in boundary lubrication regime. This paper reviews the principles of measuring lubricant film thickness by optical interferometry and some technical tips on methods using white-light spectroscopy.

  • 水上 雅史, 栗原 和枝
    原稿種別: 研究紹介
    2017 年 38 巻 3 号 p. 117-122
    発行日: 2017/03/10
    公開日: 2017/03/24
    ジャーナル フリー

    The resonance shear measurement (RSM), which we developed, can evaluate the rheological and tribological properties of confined liquids at surface separation distances (D) from μm (practically liquids are in the bulk state) to nm thicknesses. Thus, it is especially useful for studying the boundary lubrication for which the lubricant layer becomes in the nm level thickness and the solid surfaces are supposed to be partially in contact. In this article, we describe the principle and advantages of RSM, and review our recent RSM studies on tribology of nano-confined liquids. Four phenyl ether lubricant oils with different bulk viscosity confined between mica surfaces, and two ionic liquids ([C4mim] [NTf2]) and [C4mim] [BF4]) showed significant increase in viscosity and the their magnitude relation became reverse when the gap became in nanometer thick. Friction of hydrogel (double network gel) and silica sphere was dominated by the elasticity of the deformed gel-silica interface.

  • 佐々木 啓次, 木田 直美, 稲吉 成彦
    原稿種別: 研究紹介
    2017 年 38 巻 3 号 p. 123-128
    発行日: 2017/03/10
    公開日: 2017/03/24
    ジャーナル フリー

    To observe the chemical reaction on the sliding surface in boundary lubrication, we developed in-situ observation system by using Fourier Transform Infrared Attenuated Total Reflection (FTIR-ATR). This system allows us to understand the mechanism of biodiesel deposit generation on the sliding surface. Furthermore, in order to clarify the chemical and physical structural change on sliding surface in high temperature, we developed new in-situ observation system combined two kinds of observation method, FTIR-ATR and Raman spectroscopy. We clarified the structural change of Diamond Like Carbon (DLC) during friction by using this new system.

  • 八木 和行
    原稿種別: 研究紹介
    2017 年 38 巻 3 号 p. 129-134
    発行日: 2017/03/10
    公開日: 2017/03/24
    ジャーナル フリー

    In friction areas, many complex phenomena occur which involve the formation of the hydrodynamic fluid film, direct contacts between sliding surfaces leading to wear and crack initiation, and adsorption and desorption and chemical reaction of additives contained in oil to the surfaces. In-situ observation has been conducted by using a transparent material as one side of the surfaces for a better understanding of complex phenomena occurring in the friction area. This paper introduces an in-situ synchrotron X-ray diffraction (XRD) observation system for the friction area that authors developed in recently. The developed XRD observation system succeeds in detecting simultaneously the XRD ring,visible image, and near infrared image of the friction area between a rotating sapphire ring and a steel pin at 30 times per second. Information obtained by the developed in-situ observation system appears to contribute to a better understanding of the dynamics of the surface occurring in the friction area.

連載企画
伝統産業と表面科学
  • 瀬筒 秀樹
    2017 年 38 巻 3 号 p. 135-137
    発行日: 2017/03/10
    公開日: 2017/03/24
    ジャーナル フリー

    カイコ(蚕)がつむぐシルク(絹)は,古来より衣服の材料として人間に利用されてきた。シルクは,肌に優しく,低CO2排出量の天然タンパク質長繊維として見直されつつある素材である。カイコを育てて繭からシルクをとる「養蚕」は,明治時代以降の日本の主要な外貨獲得産業となり,日本の近代化を支えた。しかし,世界恐慌や代替品の化学繊維の登場,さらに国際価格競争の激化や農家の高齢化により,日本の養蚕業は深刻な存亡の危機に立たされている。そこで近年,日本に蓄積された高度な養蚕技術と,遺伝子組換え等の新たなバイオテクノロジー技術を組み合わせることで,従来の養蚕業を新たな産業(新蚕業)に転換する試みが進められている。その象徴が,「ひかるシルク」である。ひかるタンパク質=蛍光タンパク質をシルクに組み込んで,ひかるシルクをつくる技術は,これまでにないシルクと新素材をつくり出すことができるだけでなく,カイコを医薬品の製造工場として利用可能にする技術であり,「蚕業革命」を起こしうる技術である。表面科学やナノテクノロジーの研究は,今後のシルク新素材・新デバイスや新利用法の開発において,非常に重要な役割を果たしていくことが期待される。

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