Reference

Biomimetic Creation of Hierarchical Surface Structures by Combining Colloidal Self-Assembly and Au Sputter Deposition

All Rights Reserved. Biomimetic Creation of Hierarchical Surface Structures by Combining Colloidal Self-Assembly and Au Sputter Deposition. Xiu, Yonghao; Zhu, Lingbo; Hess, Dennis W.; Wong, C. P. ( Departments of Chemical and Biomolecular Engineering and of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA). Langmuir, 22(23), 9676-9681 (English) 2006 American Chemical Society.There are some reagents with their cas registry numbers 592-09-6 and 7440-57-5 are used in this study. CODEN: LANGD5. ISSN: 0743-7463. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Surfaces of hexagonally packed SiO2 spheres were functionalized with silanes contg. different hydrocarbon or fluorocarbon chains. The resulting chem. and phys. structures were studied to establish the effect of surface hydrophobicity on the measured contact angles on the rough surfaces. The results were used to assess the effects of surface modifications on the parameters in the Cassie equation. To achieve superhydrophobicity via a biomimetic approach, the authors created 2-scale structures by 1st forming hexagonally packed SiO2 spheres, followed by Au deposition on the spheres and heat treatment to form Au nanoparticles on sphere surfaces. Contact angles over 160° were achieved. This work provides improved understanding of the effect of the surface roughness and solid surface fraction on superhydrophobicity. .

Surface functionalization of porous nanostructured metal oxide thin films fabricated by glancing angle deposition

All Rights Reserved. Surface functionalization of porous nanostructured metal oxide thin films fabricated by glancing angle deposition. Tsoi, Shufen; Fok, Enrico; Sit, Jeremy C.; Veinot, Jonathan G. C. ( Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 2V4, Can.). Chemistry of Materials, 18(22), 5260-5266 (English) 2006 American Chemical Society. CODEN: CMATEX. ISSN: 0897-4756. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) The authors reported the application of soln.- and vapor-phase siloxane-based methods for tailoring the surface chem./properties of highly porous, nanostructured thin films fabricated using glancing angle deposition (GLAD). The GLAD technique produces high surface area films consisting of isolated columns and provides complete control over the film/column morphol. In the present study, the chem. tunability of a variety of metal oxide GLAD films was investigated using soln.-based and vapor-phase surface functionalization methodologies. The surface properties and structures of the treated and untreated films were investigated using SEM, advancing aq. contact angle measurements, cyclic voltammetry, and XPS. Results indicate that the surface chem. of metal oxide GLAD films could be tailored by either method; however, chem. reactivity depends strongly on the metal oxide film material. Chem.There are some commonly used reagents with their cas registry numbers 592-09-6 and 1344-28-1 in this article. tunability is demonstrated through the covalent tethering of numerous chem. moieties onto the exposed and interior surfaces of metal oxide GLAD films of varied structural motifs. Through careful choice of surface modifier, the present derivatization methods afford a full range of aq. wettability from hydrophilic to superhydrophobic without compromising film structure. These functionalized, nanoconstructed films demonstrate a high degree of tunability over both structural and surface properties, making them well suited for diverse applications such as optical filters or sensors. .