Evaporation of Dilute Sodium Dodecyl Sulfate Droplets on a Hydrophobic Substrate

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Abstract

Evaporation of surfactant-laden sessile droplets is omnipresent in nature and industrial applications such as inkjet printing. Soluble surfactants start to form micelles in an aqueous solution for surfactant concentrations exceeding the critical micelle concentration (CMC). Here, the evaporation of aqueous sodium dodecyl sulfate (SDS) sessile droplets on hydrophobic surfaces was experimentally investigated for SDS concentrations ranging from 0.025 to 1 CMC. In contrast to the constant contact angle of an evaporating sessile water droplet, we observed that, at the same surface, the contact angle of an SDS laden droplet with concentration below 0.5 CMC first decreases, then increases, and finally decreases, resulting in a local contact angle minimum. Surprisingly, the minimum contact angle was found to be substantially lower than the static receding contact angle and decreased with decreasing initial SDS concentration. Furthermore, the bulk SDS concentration at the local contact angle minimum was found to decrease with decrease in the initial SDS concentration. The location of the observed contact angle minimum relative to the normalized evaporation time and its minimum value proved to be independent of both the relative humidity and droplet volume and thus of the total evaporation time. We discuss the observed contact angle dynamics in terms of the formation of a disordered layer of SDS molecules on the substrate at concentrations below 0.5 CMC. The present work underlines the complexity of the evaporation of sessile liquid-surfactant droplets and the influence of surfactant-substrate interactions on the evaporation process.

Original languageEnglish
Pages (from-to)10453-10460
Number of pages8
JournalLangmuir
Volume35
Issue number32
DOIs
Publication statusPublished - 13 Aug 2019

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Sodium dodecyl sulfate
sodium sulfates
Sodium Dodecyl Sulfate
Contact angle
Evaporation
evaporation
Surface-Active Agents
Critical micelle concentration
Substrates
Surface active agents
micelles
surfactants
Micelles
Industrial applications
Printing
Atmospheric humidity
printing
humidity
Molecules
Water

Keywords

  • UT-Hybrid-D

Cite this

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title = "Evaporation of Dilute Sodium Dodecyl Sulfate Droplets on a Hydrophobic Substrate",
abstract = "Evaporation of surfactant-laden sessile droplets is omnipresent in nature and industrial applications such as inkjet printing. Soluble surfactants start to form micelles in an aqueous solution for surfactant concentrations exceeding the critical micelle concentration (CMC). Here, the evaporation of aqueous sodium dodecyl sulfate (SDS) sessile droplets on hydrophobic surfaces was experimentally investigated for SDS concentrations ranging from 0.025 to 1 CMC. In contrast to the constant contact angle of an evaporating sessile water droplet, we observed that, at the same surface, the contact angle of an SDS laden droplet with concentration below 0.5 CMC first decreases, then increases, and finally decreases, resulting in a local contact angle minimum. Surprisingly, the minimum contact angle was found to be substantially lower than the static receding contact angle and decreased with decreasing initial SDS concentration. Furthermore, the bulk SDS concentration at the local contact angle minimum was found to decrease with decrease in the initial SDS concentration. The location of the observed contact angle minimum relative to the normalized evaporation time and its minimum value proved to be independent of both the relative humidity and droplet volume and thus of the total evaporation time. We discuss the observed contact angle dynamics in terms of the formation of a disordered layer of SDS molecules on the substrate at concentrations below 0.5 CMC. The present work underlines the complexity of the evaporation of sessile liquid-surfactant droplets and the influence of surfactant-substrate interactions on the evaporation process.",
keywords = "UT-Hybrid-D",
author = "Wojciech Kwieciński and Tim Segers and {Van Der Werf}, Sjoerd and {Van Houselt}, Arie and Detlef Lohse and Zandvliet, {Harold J.W.} and Stefan Kooij",
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language = "English",
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Evaporation of Dilute Sodium Dodecyl Sulfate Droplets on a Hydrophobic Substrate. / Kwieciński, Wojciech; Segers, Tim; Van Der Werf, Sjoerd; Van Houselt, Arie; Lohse, Detlef; Zandvliet, Harold J.W.; Kooij, Stefan.

In: Langmuir, Vol. 35, No. 32, 13.08.2019, p. 10453-10460.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Evaporation of Dilute Sodium Dodecyl Sulfate Droplets on a Hydrophobic Substrate

AU - Kwieciński, Wojciech

AU - Segers, Tim

AU - Van Der Werf, Sjoerd

AU - Van Houselt, Arie

AU - Lohse, Detlef

AU - Zandvliet, Harold J.W.

AU - Kooij, Stefan

N1 - ACS deal

PY - 2019/8/13

Y1 - 2019/8/13

N2 - Evaporation of surfactant-laden sessile droplets is omnipresent in nature and industrial applications such as inkjet printing. Soluble surfactants start to form micelles in an aqueous solution for surfactant concentrations exceeding the critical micelle concentration (CMC). Here, the evaporation of aqueous sodium dodecyl sulfate (SDS) sessile droplets on hydrophobic surfaces was experimentally investigated for SDS concentrations ranging from 0.025 to 1 CMC. In contrast to the constant contact angle of an evaporating sessile water droplet, we observed that, at the same surface, the contact angle of an SDS laden droplet with concentration below 0.5 CMC first decreases, then increases, and finally decreases, resulting in a local contact angle minimum. Surprisingly, the minimum contact angle was found to be substantially lower than the static receding contact angle and decreased with decreasing initial SDS concentration. Furthermore, the bulk SDS concentration at the local contact angle minimum was found to decrease with decrease in the initial SDS concentration. The location of the observed contact angle minimum relative to the normalized evaporation time and its minimum value proved to be independent of both the relative humidity and droplet volume and thus of the total evaporation time. We discuss the observed contact angle dynamics in terms of the formation of a disordered layer of SDS molecules on the substrate at concentrations below 0.5 CMC. The present work underlines the complexity of the evaporation of sessile liquid-surfactant droplets and the influence of surfactant-substrate interactions on the evaporation process.

AB - Evaporation of surfactant-laden sessile droplets is omnipresent in nature and industrial applications such as inkjet printing. Soluble surfactants start to form micelles in an aqueous solution for surfactant concentrations exceeding the critical micelle concentration (CMC). Here, the evaporation of aqueous sodium dodecyl sulfate (SDS) sessile droplets on hydrophobic surfaces was experimentally investigated for SDS concentrations ranging from 0.025 to 1 CMC. In contrast to the constant contact angle of an evaporating sessile water droplet, we observed that, at the same surface, the contact angle of an SDS laden droplet with concentration below 0.5 CMC first decreases, then increases, and finally decreases, resulting in a local contact angle minimum. Surprisingly, the minimum contact angle was found to be substantially lower than the static receding contact angle and decreased with decreasing initial SDS concentration. Furthermore, the bulk SDS concentration at the local contact angle minimum was found to decrease with decrease in the initial SDS concentration. The location of the observed contact angle minimum relative to the normalized evaporation time and its minimum value proved to be independent of both the relative humidity and droplet volume and thus of the total evaporation time. We discuss the observed contact angle dynamics in terms of the formation of a disordered layer of SDS molecules on the substrate at concentrations below 0.5 CMC. The present work underlines the complexity of the evaporation of sessile liquid-surfactant droplets and the influence of surfactant-substrate interactions on the evaporation process.

KW - UT-Hybrid-D

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U2 - 10.1021/acs.langmuir.9b00824

DO - 10.1021/acs.langmuir.9b00824

M3 - Article

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SP - 10453

EP - 10460

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 32

ER -