Fabrication of ultrathin multilayered superomniphobic nanocoatings by liquid flame spray, atomic layer deposition, and silanization

Miika Sorvali, Leena Vuori, Marko Pudas, Janne Haapanen, Riitta Mahlberg, Helena Ronkainen, Mari Honkanen, Mika Valden, Jyrki M. Makela

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Superomniphobic, i.e. liquid-repellent, surfaces have been an interesting area of research during recent years due to their various potential applications. However, producing such surfaces, especially on hard and resilient substrates like stainless steel, still remains challenging. We present a stepwise fabrication process of a multilayered nanocoating on a stainless steel substrate, consisting of a nanoparticle layer, a nanofilm, and a layer of silane molecules. Liquid flame spray was used to deposit a TiO2 nanoparticle layer as the bottom layer for producing a suitable surface structure. The interstitial Al2O3 nanofilm, fabricated by atomic layer deposition (ALD), stabilized the nanoparticle layer, and the topmost fluorosilane layer lowered the surface energy of the coating for enhanced omniphobicity. The coating was characterized with field emission scanning electron microscopy, focused ion beam scanning electron microscopy, x-ray photoelectron spectroscopy, contact angle (CA) and sliding angle (SA) measurements, and microscratch testing. The widely recognized requirements for superrepellency, i.e. CA > 150° and SA < 10°, were achieved for deioinized water, diiodomethane, and ethylene glycol. The mechanical stability of the coating could be varied by tuning the thickness of the ALD layer at the expense of repellency. To our knowledge, this is the thinnest superomniphobic coating reported so far, with the average thickness of about 70 nm.

Original languageEnglish
Article number185708
JournalNanotechnology
Volume29
Issue number18
DOIs
Publication statusPublished - 9 Mar 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

Atomic layer deposition
Fabrication
Coatings
Stainless Steel
Liquids
Nanoparticles
Contact angle
Stainless steel
Silanes
Scanning electron microscopy
Ethylene Glycol
Mechanical stability
Focused ion beams
Substrates
Angle measurement
Photoelectron spectroscopy
Ethylene glycol
Interfacial energy
Surface structure
Field emission

Keywords

  • aerosol synthesis
  • atomic layer deposition
  • liquid flame spray
  • multilayered
  • nanocoating
  • silanization
  • superomniphobic

Cite this

Sorvali, Miika ; Vuori, Leena ; Pudas, Marko ; Haapanen, Janne ; Mahlberg, Riitta ; Ronkainen, Helena ; Honkanen, Mari ; Valden, Mika ; Makela, Jyrki M. / Fabrication of ultrathin multilayered superomniphobic nanocoatings by liquid flame spray, atomic layer deposition, and silanization. In: Nanotechnology. 2018 ; Vol. 29, No. 18.
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Fabrication of ultrathin multilayered superomniphobic nanocoatings by liquid flame spray, atomic layer deposition, and silanization. / Sorvali, Miika; Vuori, Leena; Pudas, Marko; Haapanen, Janne; Mahlberg, Riitta; Ronkainen, Helena; Honkanen, Mari; Valden, Mika; Makela, Jyrki M.

In: Nanotechnology, Vol. 29, No. 18, 185708, 09.03.2018.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Fabrication of ultrathin multilayered superomniphobic nanocoatings by liquid flame spray, atomic layer deposition, and silanization

AU - Sorvali, Miika

AU - Vuori, Leena

AU - Pudas, Marko

AU - Haapanen, Janne

AU - Mahlberg, Riitta

AU - Ronkainen, Helena

AU - Honkanen, Mari

AU - Valden, Mika

AU - Makela, Jyrki M.

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AB - Superomniphobic, i.e. liquid-repellent, surfaces have been an interesting area of research during recent years due to their various potential applications. However, producing such surfaces, especially on hard and resilient substrates like stainless steel, still remains challenging. We present a stepwise fabrication process of a multilayered nanocoating on a stainless steel substrate, consisting of a nanoparticle layer, a nanofilm, and a layer of silane molecules. Liquid flame spray was used to deposit a TiO2 nanoparticle layer as the bottom layer for producing a suitable surface structure. The interstitial Al2O3 nanofilm, fabricated by atomic layer deposition (ALD), stabilized the nanoparticle layer, and the topmost fluorosilane layer lowered the surface energy of the coating for enhanced omniphobicity. The coating was characterized with field emission scanning electron microscopy, focused ion beam scanning electron microscopy, x-ray photoelectron spectroscopy, contact angle (CA) and sliding angle (SA) measurements, and microscratch testing. The widely recognized requirements for superrepellency, i.e. CA > 150° and SA < 10°, were achieved for deioinized water, diiodomethane, and ethylene glycol. The mechanical stability of the coating could be varied by tuning the thickness of the ALD layer at the expense of repellency. To our knowledge, this is the thinnest superomniphobic coating reported so far, with the average thickness of about 70 nm.

KW - aerosol synthesis

KW - atomic layer deposition

KW - liquid flame spray

KW - multilayered

KW - nanocoating

KW - silanization

KW - superomniphobic

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U2 - 10.1088/1361-6528/aaaffc

DO - 10.1088/1361-6528/aaaffc

M3 - Article

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JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

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