Preparation and Application of Superhydrophobic and Superhydrophilic Coating Films by the Sol-Gel Method

溶胶-凝胶法超疏水超亲水涂膜的制备及应用

• 批准号: 09555195
• 负责人: MINAMI Tsutomu
• 金额: $ 8.06万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555195/
• 关键词: Super-hydrophobic surface; Super-hydrophilic surface; Sol-gel method; Chemical modification; Organoalkoxysilane; Contact angle; Surfact tension; Transparent; フルオロアルキルシラン

1. Alumina thin films with roughness of 20 to SO nm were formed by the sol-gel method by immersing porous alumina gel films, which were prepared from Al(O-sec-Bu)_3 chemically modified with ethyl acetoacetate, in boiling water. The roughened surface like flower of the alumina gel films after the immersion was found to consist of boehmite crystals.2. When hydrolyzed fluoroalkyltrimethoxsilane was coated on the flower-like boehmite thin film, the contact angle for water increased with an increase of immersion time, and the immersion for 30 s was long enough to give super-water-repellency and high transparency ; the contact angle for water of the films was 165ﾟand the transmittance for the visible light was higher than 92 %.3. The super-hydrophobic alumina films coated with fluoroalkyltrimethoxysilane became super- hydrophilic after a heat treatment at temperatures higher than 500* ; the contact angle for water on the films was less than 5ﾟ.4. Fluorine-free super-hydrophobic coatings were successfully prepared on the flower-like alumina by over-coating with hydrolyzed alkyltrimethoxysilane. The length of the alkyl groups and the concentration of the alkyltrimethoxysilane in the coating solution affected the hydrophobicity of the resultant coating films.5. We have prepared super-hydrophobic coatings without flower-like alumina under layer using several organoalkoxysilanes. Among the organoalkoxysilanes examined, dimethyldiethoxysilane and phenyltriethoxysilane formed transparent super-hydrophobic coatings by heat-treating their films. SEM observation showed that the coating had a finely roughened surface with fractal structure.

1. 采用溶胶-凝胶法制备了以乙酰乙酸乙酯改性的Al(O-sec-Bu)_3为原料制备的多孔氧化铝凝胶膜，并将其浸泡在沸水中，形成了粗糙度为20 ~ SO nm的氧化铝薄膜。经浸渍后的氧化铝凝胶膜表面呈花状粗糙，由薄水铝石晶体组成。将水解的氟烷基三甲氧基硅烷涂覆在花状薄水铝石薄膜上，随着浸泡时间的延长，水的接触角增大，浸泡时间为30s，具有超强的拒水性和高透明度；薄膜对水的接触角为165‰，对可见光的透过率大于92%。采用氟烷基三甲氧基硅烷包覆的超疏水氧化铝膜经500℃以上热处理后，具有超亲水性；水在膜上的接触角小于5‰。用水解烷基三甲氧基硅烷包覆在花状氧化铝表面，成功地制备了无氟超疏水涂层。烷基的长度和烷基三甲氧基硅烷在涂膜溶液中的浓度影响涂膜的疏水性。利用几种有机烷氧基硅烷制备了不含花状氧化铝的超疏水涂层。在所检测的有机烷氧基硅烷中，二甲基二氧基硅烷和苯三乙氧基硅烷通过热处理膜形成透明的超疏水涂层。SEM观察表明，涂层表面粗糙，呈分形结构。

项目成果

K.Tadanaga: "Preparation of Coating Films Using Vinyltriethoxisilane by the Sol-Gel Method" Ceramic Data Book '98. 147-150 (1998)

K.Tadanaga：“通过溶胶-凝胶法使用乙烯基三乙氧基硅烷制备涂膜”陶瓷数据手册 98。

A.Matsuda: "Physical and Chemical Properties of MeSiO_<3/2>-SiO_2 Films Prepared by the Sol-Gel Method" Proc.X VIII Inter.Cong.on Glass. C4. 37-42 (1998)

A.Matsuda：“溶胶-凝胶法制备的MeSiO_<3/2>-SiO_2薄膜的物理和化学性质”Proc.X VIII Inter.Cong.on Glass。

A.Matsuda: "Fine-Patterning and Characterization of Gel Films Derived from Methyltriethoxysilane and Tetraethoxysilane" J.Am.Ceram.Soc.81[11]. 2849-2852 (1998)

A.Matsuda：“甲基三乙氧基硅烷和四乙氧基硅烷衍生的凝胶膜的精细图案化和表征”J.Am.Ceram.Soc.81[11]。

K.Azuta: "Water and Oxygen Permeability of Silica Thin Films Containing Organic Polymers Coated on PET Substrate by the Sol-Gel Method" J.Ceram.Soc.Jpn.107[3]. 293-296 (1998)

K.Azuta：“通过溶胶-凝胶法在 PET 基材上涂覆含有机聚合物的二氧化硅薄膜的水和氧渗透性”J.Ceram.Soc.Jpn.107[3]。

K.Tadanaga: "Sintering and Crystallization of La_2O_3-Doped Al_2O_3 Aerogels from Chemically Modified Aluminum Alkoxide" J.Non-Cryst.Solids. 225. 230-233 (1998)

K.Tadanaga：“化学改性烷氧基铝中 La_2O_3 掺杂的 Al_2O_3 气凝胶的烧结和结晶”J.Non-Cryst.Solids。