Tasleem Sahar, Sabah Aneeqa, Cheema Ujala A, Sabir Aneela
Department of Physics, Lahore College for Women University (LCWU), Lahore 54000, Pakistan.
Department of Polymer Engineering & Technology, University of the Punjab (PU), Lahore 54590, Pakistan.
ACS Omega. 2019 Aug 9;4(8):13543-13552. doi: 10.1021/acsomega.9b01894. eCollection 2019 Aug 20.
Monodispersed and transparent hybrid silica wires were synthesized by the sol-gel method using the chemical surfactant trimethoxyoctylsilane (CTMOS or CHOSi) and, for the first time, by green surfactants (/lotus leaf extract). The purpose was to introduce a less toxic, cost-effective, and one-step easy approach to get superhydrophobic silica films. Each of the surfactants was used at two different concentrations to investigate hydrophobicity of the films. Assembly of silica wires was obtained by dip-coating and vacuum filtration methods on glass and cellulose acetate filter paper as substrates, respectively. The water contact angle (CA) up to 154° was measured for hybrid silica films on filter paper, which revealed their superhydrophobicity as compared to hydrophobic behavior of those films coated on a glass substrate with CA up to 135°. Chemical, optical, and structural properties of prepared films were characterized by Fourier transform infrared spectroscopy, UV-vis spectroscopy, scanning electron microscopy, thermogravimetry, and differential scanning calorimetry. The hybrid silica wires prepared displayed good transparency, low surface energy, and superhydrophobicity. These silica assemblies can create outstanding and multifunctional structures with superhydrophobic coatings for waterproof electronic devices, military uniforms, self-cleaning surfaces, etc.
采用溶胶 - 凝胶法，使用化学表面活性剂三甲氧基辛基硅烷（CTMOS 或 CHOSi），首次使用绿色表面活性剂（荷叶提取物）合成了单分散且透明的杂化二氧化硅线。目的是引入一种毒性较小、成本效益高且一步法简便的方法来制备超疏水二氧化硅薄膜。每种表面活性剂均以两种不同浓度使用，以研究薄膜的疏水性。分别通过浸涂和真空过滤法，在玻璃和醋酸纤维素滤纸上作为基底获得二氧化硅线的组装体。对于滤纸上的杂化二氧化硅薄膜，测得水接触角（CA）高达 154°，这表明与涂覆在玻璃基底上 CA 高达 135° 的薄膜的疏水行为相比，它们具有超疏水性。通过傅里叶变换红外光谱、紫外 - 可见光谱、扫描电子显微镜、热重分析和差示扫描量热法对制备薄膜的化学、光学和结构性质进行了表征。所制备的杂化二氧化硅线具有良好的透明度、低表面能和超疏水性。这些二氧化硅组装体可为防水电子设备、军装、自清洁表面等创建具有超疏水涂层的出色多功能结构。
