Energetics of topographically designed Smectic-A oily streaks

Amine Missaoui; Adam L. Susser; Hillel Aharoni; Charles Rosenblatt

doi:10.1039/d3sm00306j

Energetics of topographically designed Smectic-A oily streaks

Amine Missaoui, Adam L. Susser, Hillel Aharoni, Charles Rosenblatt

Department of Physics of Complex Systems

Weizmann Institute of Science

Research output: Contribution to journal › Article › peer-review

Abstract

A thin Smectic-A liquid crystal (LC) film is deposited on a polymer vinyl alcohol-coated substrate that had been scribed with a uniform easy axis pattern over a square of side length L ≤ 85 μm. The small size of the patterned region facilitates material distribution to form either a hill (for a thin film) or divot (for a thick film) above the scribed square and having an oily streak (OS) texture. Optical profilometry measurements vs. film thickness suggest that the OS structure aims to adopt a preferred thickness z ₀ that depends on the nature of the molecule, the temperature, and the surface tension at the air interface.

Original language	English
Pages (from-to)	3733-3738
Number of pages	6
Journal	Soft Matter
Volume	19
Issue number	20
Early online date	16 May 2023
DOIs	https://doi.org/10.1039/d3sm00306j
State	Published - 28 May 2023

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title = "Energetics of topographically designed Smectic-A oily streaks",

abstract = "A thin Smectic-A liquid crystal (LC) film is deposited on a polymer vinyl alcohol-coated substrate that had been scribed with a uniform easy axis pattern over a square of side length L ≤ 85 μm. The small size of the patterned region facilitates material distribution to form either a hill (for a thin film) or divot (for a thick film) above the scribed square and having an oily streak (OS) texture. Optical profilometry measurements vs. film thickness suggest that the OS structure aims to adopt a preferred thickness z 0 that depends on the nature of the molecule, the temperature, and the surface tension at the air interface.",

author = "Amine Missaoui and Susser, {Adam L.} and Hillel Aharoni and Charles Rosenblatt",

note = "We thank Dr Andrew J. Ferris for useful discussions. CR thanks the Weizmann Institute of Science, Rehovot, Israel for a Weston Visiting Professorship. This work was supported by the National Science Foundation under grant DMR1901797, by the National Aeronautics and Space Administration under grant NNX17AC76G, and the United States-Israel Binational Science Foundation (BSF) under grant 2018380.",

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doi = "10.1039/d3sm00306j",

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AU - Aharoni, Hillel

AU - Rosenblatt, Charles

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N2 - A thin Smectic-A liquid crystal (LC) film is deposited on a polymer vinyl alcohol-coated substrate that had been scribed with a uniform easy axis pattern over a square of side length L ≤ 85 μm. The small size of the patterned region facilitates material distribution to form either a hill (for a thin film) or divot (for a thick film) above the scribed square and having an oily streak (OS) texture. Optical profilometry measurements vs. film thickness suggest that the OS structure aims to adopt a preferred thickness z 0 that depends on the nature of the molecule, the temperature, and the surface tension at the air interface.

AB - A thin Smectic-A liquid crystal (LC) film is deposited on a polymer vinyl alcohol-coated substrate that had been scribed with a uniform easy axis pattern over a square of side length L ≤ 85 μm. The small size of the patterned region facilitates material distribution to form either a hill (for a thin film) or divot (for a thick film) above the scribed square and having an oily streak (OS) texture. Optical profilometry measurements vs. film thickness suggest that the OS structure aims to adopt a preferred thickness z 0 that depends on the nature of the molecule, the temperature, and the surface tension at the air interface.

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DO - 10.1039/d3sm00306j

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VL - 19

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JO - Soft Matter

JF - Soft Matter

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Energetics of topographically designed Smectic-A oily streaks

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