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The final goal of the present investigation is the preparation of a high efficiency heat transfer surface for vapor condensation. In this work, a new method has been developed for preparation of thiol self-assembled monolayers (SAMs) covered copper surface with wettability gradient, which is the painting alcohol solutions of hydrophobic perfluoroalkylthiols and hydrophilic mercaptoalcohols on the electrochemically reduced oxide-free varying copper surface. The wettability gradient of the surface could be manipulated in a wide range with a Wenzel equation. The results of vapor condensation experiments were shown that numerous liquid droplets nucleate and grow by coalescence with surrounding drops, then the droplet rapidly moved from the perfluoroalkylthiol SAMs covered hydrophobic side to the mercaptoalcohols SAMs covered hydrophilic side. This phenomenon could be useful for passively enhancing heat transfer including two-phase flow such as heat exchangers and heat pipes., 資料番号: AA0046917075

金属表面に形成されたチオール誘導体自己組織単分子膜 (SAM) の還元的脱離のサイクリックボルタンメトリーの研究例を紹介した. 還元脱離過程は, SAMの状態を分析するのに有効である. SAM中の分子間相互作用, 二成分系の相挙動などの構造的な情報だけでなく, 吸着した分子の溶液中の分子との置換反応速度, 吸着した分子の表面拡散速度, SAM表面での化学反応の速度などについての情報を比較的容易に得ることができることを例示した.

Hydrophilic microtunnel array was fabricated by thiol microContact Printing (micro CP) on copper surface with Poly Dimethylsiloxane (PDMS) stamps. Using printing circuit board substrates as PDMS stamp master was successfully applied to pattern copper surface with an array of parallel lines of hydrophobic Octadecanethiol (ODT) by micro CP. The results of vapor condensation on the wettability patterned copper surface were shown that numerous liquid droplets nucleate and grow by coalescence with surrounding drops, then the liquids moved from the hydrophobic ODT covered condensation area to the hydrophilic microgroove ones. This type of microtunnel could be adaptable for microgroove of Micro Heat Pipe (MHP)., 資料番号: AA0048095037