Improvement of superhydrophobic property of materials by using oil-in-water emulsion of alkyl ketene dimer

Name: Roeurn, Bunla

keyword: Fatty acid derivatives

; Superhydrophobic

; Alkyl ketene dimer emulsion

; Oil-in-water emulsion

; Water-repellent paper

Abstract: Modifications of material’s surfaces by water-repellent agents typically make use of polyolefin, which require harsh organic solvents and become difficult to recycle. Moreover, seeking more sustainable green chemical processes and alternative materials are focused for many industries. The aim of this work is to enhance water-repellent property of material products such as paper and cotton fabric by treating with water-based emulsion of fatty acid derivatives, alkyl ketene dimer (AKD). AKD emulsions (or nanoparticles) were fabricated by a classical oil-in-water emulsion with ultrasonication-assisted process. Different type of solvents acted as oil phase e.g., chloroform, cyclohexane, hexane, and ethyl acetate was used which named Emul-1, Emul-2, Emul-3, and Emul-4, respectively. Without the adverse effect of surfactant, an anionic sodium dodecyl sulphate (SDS) was used as stabilizing agent. The obtained AKD emulsions showed high stability, monodispersed with an average size in range of 140-180 nm for all cases. At as-prepared pH of 5.5, the zeta potential value of AKD emulsions were negatively charged (> -57.0 mV) which came from sulphate (SO42-) groups of SDS. By using an ultrasonic spraying process, the emulsion was coated onto the 2 types of materials’ surface e.g., paper, and cotton fabric. The treated papers showed a large improvement in hydrophobicity, with a water contact angle (WCA) of 130º by using Emul-2. The results from attenuated total Reflection-Fourier transform infrared spectroscopy indicated chemical reactions between AKD and hydroxyl groups from paper’s cellulose structure. For cotton fabric treatment which expected to use as hygiene mask protection, not only the improvement of hydrophobic property but also anti-microorganism e.g., bacterial and/or virus was studied. Then, the Emul-2 was adjusted by changing type of surfactant to amphoteric lecithin or phosphatidylcholine (PC) which contained active functional groups to against microorganism. The treated fabric showed improvement of hydrophobicity with WCA of 145° (close to superhydrophobicity) and had efficiency to against gram-positive bacterial (S.aureus) of 73.52 %.

Thammasat University. Thammasat University Library

Address: BANGKOK

Email: preserv@tu.ac.th

Name: Chariya Kaewsaneha

Role: advisor

Name: Pakorn Opaprakasit

Role: co-advisor

Created: 2020

Modified: 2023-02-14

Issued: 2023-02-14

วิทยานิพนธ์/Thesis

application/pdf

DOI: 10.14457/TU.the.2020.1050

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Engineering and Technology

Grantor: Thammasat University

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