2010年2月
Ultralyophobic Oxidized Aluminum Surfaces Exhibiting Negligible Contact Angle Hysteresis
LANGMUIR
- ,
- 巻
- 26
- 号
- 4
- 開始ページ
- 2567
- 終了ページ
- 2573
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/la9028518
- 出版者・発行元
- AMER CHEMICAL SOC
Ultralyophobic oxidized aluminum surfaces exhibiting negligible contact angle hysteresis for probe liquids were prepared by chemical vapor deposition (CVD) of bis((tridecafluoro-1,1,2,2,-tetrahydrooctyl)-dimethylsiloxy)methylsilane (CF(3)(CF(2))(5)CH(2)CH(2)Si(CH(3))(2)O)(2)SiCH(3)H, (R(F)Si(Me)(2)O)(2)SiMeH). Oxidized aluminum surfaces were prepared by photooxidation/cleaning of sputter-coated aluminum on silicon wafers (Si/AlAl(2)O(3)) using oxygen plasma. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) confirmed that this facile CVD method produces a monolayer with a thickness of 1.1 nm on the Si/Al(Al2O3) surface without a discernible change in surface morphology. After monolayer deposition, the hydrophilic Si/Al(Al2O3) surface became both hydrophobic and oleophobic and exhibited essentially no contact angle hysteresis for water and n-hexadecane (advancing/receding contact angles (theta(A)/theta(R)) = 110 degrees/109 degrees and 52 degrees/50 degrees, respectively). Droplets move very easily on this surface and roll off of slightly tilted Surfaces, independently of the contact angle (which is it practical definition of ultralyophobic). A conventional fluoroalkylsilane monolayer was also prepared from 1H, 1H,2H,2H-perfluorodecyltrimethoxysilane (CF(3)(CF(2))(7)CH(2)CH(2)Si(OCH(3))(3), R(F)Si(OMe)(3)) for comparison. The theta(A)/theta(R) values for water and n-hexadecane are 12 degrees/106 degrees and 76 degrees/71 degrees, respectively. The larger hysteresis values indicate the "pinning" of probe liquids, even though advancing contact angles are larger than those of the (R(F)Si(Me)(2)O)(2)SiMeH-derived monolayers. The (RFSi(Me)(2)O)(2)SiMeH-derived monolayers have excellent hydrolytic stability in water. We propose that the (R(F)Si(Me)(2)O)(2)SiMeH-derived monolayers are flexible and liquidlike and that drops ill contact with these Surfaces experience very low energy barriers between metastable states, leading to the formation of nonhysteretic ultralyophobic surfaces.
- リンク情報
- ID情報
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- DOI : 10.1021/la9028518
- ISSN : 0743-7463
- J-Global ID : 201002268157454027
- Web of Science ID : WOS:000274342200058