A method for reversible control over nano-roughness of colloidal particles

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Colloidal particles often display a surface topography that is smooth down to the nanometer scale. Introducing roughness at this length scale can drastically change the colloidal interactions, adsorption at interfaces and bulk flow behavior. We report on a novel, simple method to induce and control nano-scale roughness on (water based) polymer latex colloids. Reducing the amount of dissolved gases in the aqueous phase from the electrolyte solution surrounding the particles, generates self-structured surface asperities with an amplitude that can be tuned via temperature and repetition of the treatment. Due to the viscoelastic nature of the polymeric asperities, a mild thermal treatment below the glass transition temperature can be used for nanostructure relaxation, so that the particles can recover their original topography, making this method fully reversible. Roughness can thus be controlled without affecting the chemical composition of the colloidal surface. Experiments for varying particle size, polymer type and surface chemistry suggest a broad applicability of our method.

LanguageEnglish
Pages50-58
Number of pages9
JournalColloids and surfaces A: Physicochemical and engineering aspects
Volume560
DOIs
Publication statusPublished - 5 Jan 2019

Fingerprint

roughness
Surface roughness
Polymers
topography
Latex
Colloids
Surface topography
Surface chemistry
Latexes
dissolved gases
Topography
Electrolytes
Nanostructures
polymers
latex
Gases
Particle size
Heat treatment
glass transition temperature
colloids

Keywords

  • Colloids
  • Degassing
  • Polymer latex
  • Polystyrene
  • Surface roughness
  • Thermo-reversible

Cite this

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title = "A method for reversible control over nano-roughness of colloidal particles",
abstract = "Colloidal particles often display a surface topography that is smooth down to the nanometer scale. Introducing roughness at this length scale can drastically change the colloidal interactions, adsorption at interfaces and bulk flow behavior. We report on a novel, simple method to induce and control nano-scale roughness on (water based) polymer latex colloids. Reducing the amount of dissolved gases in the aqueous phase from the electrolyte solution surrounding the particles, generates self-structured surface asperities with an amplitude that can be tuned via temperature and repetition of the treatment. Due to the viscoelastic nature of the polymeric asperities, a mild thermal treatment below the glass transition temperature can be used for nanostructure relaxation, so that the particles can recover their original topography, making this method fully reversible. Roughness can thus be controlled without affecting the chemical composition of the colloidal surface. Experiments for varying particle size, polymer type and surface chemistry suggest a broad applicability of our method.",
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A method for reversible control over nano-roughness of colloidal particles. / İlhan, B.; Annink, C.; Nguyen, D. V.; Mugele, F.; Siretanu, I.; Duits, M. H.G.

In: Colloids and surfaces A: Physicochemical and engineering aspects, Vol. 560, 05.01.2019, p. 50-58.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - A method for reversible control over nano-roughness of colloidal particles

AU - İlhan, B.

AU - Annink, C.

AU - Nguyen, D. V.

AU - Mugele, F.

AU - Siretanu, I.

AU - Duits, M. H.G.

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AB - Colloidal particles often display a surface topography that is smooth down to the nanometer scale. Introducing roughness at this length scale can drastically change the colloidal interactions, adsorption at interfaces and bulk flow behavior. We report on a novel, simple method to induce and control nano-scale roughness on (water based) polymer latex colloids. Reducing the amount of dissolved gases in the aqueous phase from the electrolyte solution surrounding the particles, generates self-structured surface asperities with an amplitude that can be tuned via temperature and repetition of the treatment. Due to the viscoelastic nature of the polymeric asperities, a mild thermal treatment below the glass transition temperature can be used for nanostructure relaxation, so that the particles can recover their original topography, making this method fully reversible. Roughness can thus be controlled without affecting the chemical composition of the colloidal surface. Experiments for varying particle size, polymer type and surface chemistry suggest a broad applicability of our method.

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