Publication

Hydrophobic coating of mica by stearic acid vapor deposition

2014
Journal Articles

Abstract

We report on the preparation of thin films of stearic acid on mica by sublimation in air. We correlate their affinity to water (hydrophobic vs. hydrophilic character) to the morphology of the films as observed by Atomic Force Miscorcopy (AFM). Submonolayer and monolayer coverage exhibited hydrophilic character with dendritic shape defective self-assembled monolayer structures. With further exposure to stearic acid regular polyhedric multilayer three-dimensional structures formed on top of the monolayer, following the Stranski-Krastanov mechanism of growth. These structures were found to be compatible with a stearic acid bulk crystal structure. Coalesce of the structures generated a hydrophobic multilayer coating showing spiral growth. However, the multilayer coating was not homogeneous showing areas with only defective monolayer coating that still exposes bare mica. (C) 2013 Elsevier B.V. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/bfb62ca4-40a8-4d88-b486-d37201cb4091

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2014
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bfb62ca4-40a8-4d88-b486-d37201cb4091

About this result

Related concepts (27)

Thin film

A thin film is a layer of material ranging from fractions of a nanometer (monolayer) to several micrometers in thickness. The controlled synthesis of materials as thin films (a process referred to as deposition) is a fundamental step in many applications. A familiar example is the household mirror, which typically has a thin metal coating on the back of a sheet of glass to form a reflective interface. The process of silvering was once commonly used to produce mirrors, while more recently the metal layer is deposited using techniques such as sputtering.

Thin-film optics

Thin-film optics is the branch of optics that deals with very thin structured layers of different materials. In order to exhibit thin-film optics, the thickness of the layers of material must be similar to the coherence length; for visible light it is most often observed between 200 and 1000 nm of thickness. Layers at this scale can have remarkable reflective properties due to light wave interference and the difference in refractive index between the layers, the air, and the substrate.

Stearic acid

Stearic acid (ˈstɪərɪk , stiˈærɪk ) is a saturated fatty acid with an 18-carbon chain. The IUPAC name is octadecanoic acid. It is a soft waxy solid with the formula . The triglyceride derived from three molecules of stearic acid is called stearin. Stearic acid is a prevalent FA in nature, found in many animal and vegetable fats, but is usually higher in animal fat than vegetable fat. It has a melting point of 69.4 °C and a pKa of 4.50. Its name comes from the Greek word στέαρ "stéar", which means tallow.

Related publications (32)

Hydrophobic coating of mica by stearic acid vapor deposition

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