SELF-ASSEMBLY ON DUAL WETTABLE SURFACE

Imtiaz Ahmad, Rahim Jan, Hidayat Ullah Khan, Akhlaq Hussain, Aqsa Tabassum, Aqsa Latif () and Ambreen Ali
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Imtiaz Ahmad: Department of Physics, University of Peshawar, Peshawar 25120, Pakistan
Rahim Jan: ��School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan
Hidayat Ullah Khan: Department of Physics, University of Peshawar, Peshawar 25120, Pakistan
Akhlaq Hussain: Department of Physics, University of Peshawar, Peshawar 25120, Pakistan
Aqsa Tabassum: Department of Physics, University of Peshawar, Peshawar 25120, Pakistan
Aqsa Latif: Department of Physics, University of Peshawar, Peshawar 25120, Pakistan
Ambreen Ali: Department of Physics, University of Peshawar, Peshawar 25120, Pakistan

Surface Review and Letters (SRL), 2021, vol. 28, issue 10, 1-10

Abstract: A droplet of nanoparticle suspension is deposited on a specially designed dual wettable surface. Half diagonal of SiO2 substrate was oil coated and other half stayed unchanged. The droplet forms contact angle of 35∘ on the unchanged dry portion whereas it reaches to 60∘ on the oil coated region. Nanoparticle dried in stick–slip fashion where such effect was more pronounced on the oil-wet region. Scanning electron microscope (SEM) images revealed large ribbon-like nanorod assembly on the dry-region and short monolayer ribbons on the oil-wet part of the substrate. On both surfaces, shape-separation effect produced rod-rich and sphere-rich regions. The assemblies formed over the dry portion were dense whereas significantly small number of nanoparticles were observed on the oil-wet region. The droplet contact-line remained partially dynamic owing to the dual wettable design of the surface. Such contact-line dynamics facilitated the shape-separation effect induced by the surfactant molecules and dictated the deposition process over the surface. This work will be helpful to study shape-separation effect of small biological entities and multisystem of nanoparticles.

Keywords: Wettable; contact-line; evaporation; oil-wet (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21500876

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