Superhydrophobic silica aerogels by fluorination at the gel stage

Roig, Anna; Molins, Elı́es; Rodrı́guez, Elisenda; Martı́nez, Sandra; Moreno‐Mañas, Marcial; Vallribera, Adelina

doi:10.1039/b407987f

Cited by 64 publications

(29 citation statements)

References 10 publications

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“…Such surfaces have been created on a variety of materials such as silicones [5], alumina [6][7][8], silicon [9], silica [10][11][12][13][14], polyelectrolytes [15,16], carbon nanotubes [17], polystyrene [18], PTFE (polytetrafluoroethylene) [19] and fluorocarbons [20], and polybutadiene [21]. Several criteria have been used to characterize these surfaces including contact angle (>150 • ), contact angle hysteresis (<10 • ) and roll off angle.…”

Section: Introductionmentioning

confidence: 99%

UV and thermally stable superhydrophobic coatings from sol–gel processing

Xiu

Hess

Wong

2008

Journal of Colloid and Interface Science

142

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Section: Introductionmentioning

confidence: 99%

UV and thermally stable superhydrophobic coatings from sol–gel processing

Xiu

Hess

Wong

2008

Journal of Colloid and Interface Science

142

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“…8,9 These low surface energy materials can be obtained by uorinating the silica gel through different chemical transformations post-gelation or by adding a uorinated reactive silane as a co-monomer during the sol-gel process. 10,11 For example, Lermontov et al acetylated amine terminated aerogels with the readily available reagent, methyl triuoroacetate. 12 The authors also synthesized a uori-nated reactive silane and employed it as a co-monomer with tetraethyl orthosilicate (TEOS) to prepare uorinated aerogels and it was determined that the method of uorine incorporation produced samples with different specic surface areas.…”

Section: -7mentioning

confidence: 99%

Synthesis and characterization of partially fluorinated aerogels and xerogels from environmentally-compatible precursors

et al. 2017

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A new fluorocyclic silane monomer was prepared from environmentally benign and commercially available starting reagents in two, high yielding steps. The monomer was characterized by multi-nuclear NMR ( 1 H, 13 C, 19 F, and 29 Si). The monomer was used in the preparation of the first known fluorocyclic aerogels and xerogels. Due to the hydrophobic nature of the fluorocyclic monomer, a modified sol-gel synthesis was utilized in which a minimum amount of water was used. The mol% of the fluorocyclic monomer was systematically varied in both types of silica gels and the effects on the properties of the aerogels and xerogels was analyzed by scanning electron microscopy, BET surface area measurements, differential scanning calorimetry, and thermogravimetric analysis. It was determined that in both aerogels and xerogels, increasing the mol% of the fluorocyclic monomer resulted in condensed materials (i.e., pore collapse). Increased monomer concentration affected the gels thermal stability as the monomer is more susceptible to thermal decomposition than the silica gel. Pore collapse accelerates this effect as the condensed medium dissipates heat less efficiently.

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“…Generally, superhydrophobic surfaces are produced mainly in two ways. One is to create a rough structure on a hydrophobic surface [33][34][35][36], and the other is to modify a rough surface with low surface-energy materials [37,38].…”

Section: Introductionmentioning

confidence: 99%

Sol Gel Synthesis and Characterization of Zirconia Containing Hydrophobic Silica Nanoparticles

Ellateif¹,

Mitra²

2017

JAN

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Abstract. Hydrophobic mesoporous zirconia containing silica nanoparticles was synthesized via sol gel process. Silica sol was prepared and subsequently liquid modified with different proportions of zirconia. The effects of zirconia content on the silica textures and properties were studied. TGA results confirmed the development of hydrophobicity in zirconia containing silica nanoparticles. The synthesized nanoparticles were characterized by FTIR and XRF. The topography of silica particles changed as a function of zirconia content as evident from FESEM and TEM results. From XRD investigation, surface area measurement and pore size analysis it was observed that the synthesized silica was semi amorphous materials with very narrow pore diameter distribution as a function of zirconia content. From nitrogen physisorption studies mesoporous nature (type V) of the synthesized silica was noted. The synthesized pure silica possessed significant surface area while the zirconium content caused a reduction on the surface area of silica zirconium nanoparticles.

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Superhydrophobic silica aerogels by fluorination at the gel stage

Abstract: Superhydrophobic silica aerogels are obtained by surface modification of standard silica gels prepared by a two-step process with a heavily fluorinated silyl chloride followed by supercritical evacuation of the solvent.

Cited by 64 publications

References 10 publications

UV and thermally stable superhydrophobic coatings from sol–gel processing

UV and thermally stable superhydrophobic coatings from sol–gel processing

Synthesis and characterization of partially fluorinated aerogels and xerogels from environmentally-compatible precursors

Sol Gel Synthesis and Characterization of Zirconia Containing Hydrophobic Silica Nanoparticles

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