Atmospheric synthesis of superhydrophobic TiO2 nanoparticle deposits in a single step using Liquid Flame Spray

Aromaa, Mikko; Arffman, Anssi; Suhonen, Heikki; Haapanen, Janne; Keskinen, Jorma; Honkanen, Mari; Nikkanen, Juha-Pekka; Levänen, Erkki; Messing, Maria E.; Deppert, Knut; Teisala, Hannu; Tuominen, Mikko; Kuusipalo, Jurkka; Stępień, Michał; Saarinen, Jarkko J.; Toivakka, Martti; Mäkelä, Jyrki M.

doi:10.1016/j.jaerosci.2012.04.009

Cited by 34 publications

(30 citation statements)

References 43 publications

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“…The titania particles in Figure 5b, on the other hand, were sintered to a faceted form, as expected (Ahonen et al 2001;Binder et al 2010). Based on the previous studies, the LFS-generated titania nanopowder is mostly crystalline anatase (Aromaa et al , 2012. However, after the sintering step at 1500 C, we expect that the phase of the titania changes to rutile (Ahonen et al 2001).…”

Section: Particle Morphologies Observed With Electronsupporting

confidence: 77%

Coating of Silica and Titania Aerosol Nanoparticles by Silver Vapor Condensation

Harra

Juuti

Haapanen

et al. 2015

Aerosol Science and Technology

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Silica and titania aerosol nanoparticles are coated with silver through a physical coating process. The silver is evaporated in a tubular furnace flow system and condensed on the ceramic carrier particles with diameters of approximately 100 nm. The temperature gradient in the furnace system is optimized in order to avoid homogeneous nucleation of the silver. The generated ceramic-silver composite nanoparticles are characterized with aerosol measurements and analytical transmission electron microscopy. Two completely different particle morphologies are clearly observed, silver-decoration and composite doublet, with amorphous silica and crystalline rutile titania as the carrier particles, respectively. The former morphology consists of multiple silver nanodots with diameters of 1-10 nm, while in the latter morphology the silver had formed a larger structure with a size comparable to that of the carrier particle. Different shapes are observed in these larger silver structures, such as triangular, rodlike, and hexagonal. Differences in the silver particle migration on the surface of the silica and titania particles is proposed to be the key factor resulting into the two distinct particle morphologies.

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Section: Particle Morphologies Observed With Electronsupporting

confidence: 77%

Coating of Silica and Titania Aerosol Nanoparticles by Silver Vapor Condensation

Harra

Juuti

Haapanen

et al. 2015

Aerosol Science and Technology

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“…We propose an alternative route for producing a SLIPS via direct nanoparticle surface coating utilizing Liquid Flame Spray (LFS 5,6 ) LFS is a promising method as it enables in-situ processing and is more readily scalable on various substrate materials than other methods, both chemical and mechanical, 7 and is more cost efficient than most approaches reported in the literature to process porous surfaces.…”

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confidence: 99%

“…The substrate was passed through the flame (15 cm from the base of the burner), with a velocity of 50 m/min, 10 times. 5 This repeated coating process produces a 0.5-1 lm thick coating with excess of 90% porosity. 8 This porous structure was then pipetted full with silicone oil with a viscosity of 50 cSt (25 C, Sigma Aldrich).…”

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confidence: 99%

Achieving a slippery, liquid-infused porous surface with anti-icing properties by direct deposition of flame synthesized aerosol nanoparticles on a thermally fragile substrate

Juuti

Haapanen

Stenroos

et al. 2017

Applied Physics Letters

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Slippery, liquid-infused porous surfaces offer a promising route for producing omniphobic and anti-icing surfaces. Typically, these surfaces are made as a coating with expensive and time consuming assembly methods or with fluorinated films and oils. We report on a route for producing liquid-infused surfaces, which utilizes a liquid precursor fed oxygen-hydrogen flame to produce titania nanoparticles deposited directly on a low-density polyethylene film. This porous nanocoating, with thickness of several hundreds of nanometers, is then filled with silicone oil. The produced surfaces are shown to exhibit excellent anti-icing properties, with an ice adhesion strength of ∼12 kPa, which is an order of magnitude improvement when compared to the plain polyethylene film. The surface was also capable of maintaining this property even after cyclic icing testing.

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“…Alternatively, if an excess amount of hydrogen will be injected, then the flame will create reducing conditions. In the study by Aromaa et al (2012), it was found out that an excess amount of hydrogen in the flame may have an effect on the surface chemistry of the generated particles, and the amount of carbon/hydrocarbons on the surface. But in their case the product Ti-compound remained still in the form of TiO 2 .…”

Section: Methods Descriptionmentioning

confidence: 99%

Liquid Flame Spray—A Hydrogen-Oxygen Flame Based Method for Nanoparticle Synthesis and Functional Nanocoatings

Mäkelä¹,

Haapanen²,

Harra³

et al. 2017

KONA

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In this review article, a specific flame spray pyrolysis method, Liquid Flame Spray (LFS), is introduced to produce nanoparticles using a coflow type hydrogen-oxygen flame utilizing pneumatically sprayed liquid precursor. This method has been widely used in several applications due to its characteristic features, from producing nanopowders and nanostructured functional coatings to colouring of art glass and generating test aerosols. These special characteristics will be described via the example applications where the LFS has been applied in the past 20 years.

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Atmospheric synthesis of superhydrophobic TiO2 nanoparticle deposits in a single step using Liquid Flame Spray

Cited by 34 publications

References 43 publications

Coating of Silica and Titania Aerosol Nanoparticles by Silver Vapor Condensation

Coating of Silica and Titania Aerosol Nanoparticles by Silver Vapor Condensation

Achieving a slippery, liquid-infused porous surface with anti-icing properties by direct deposition of flame synthesized aerosol nanoparticles on a thermally fragile substrate

Liquid Flame Spray—A Hydrogen-Oxygen Flame Based Method for Nanoparticle Synthesis and Functional Nanocoatings

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