Coupling of synthesis and modification to produce hydrophobic or functionalized nano-silica particles

Yu, Keyi; Liang, Yong; Ma, Guanxiang; Yang, Ling; Wang, Ting-Jie

doi:10.1016/j.colsurfa.2019.04.077

Cited by 26 publications

(18 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The PMMA + NP sample has no contact angle results and consequently no surface energy, since it's very hydrophilic. Similar results were obtained by Yu (2019) 17 with an unmodified silica nanoparticle surface compared with a functionalized silica nanoparticle surface. The contact angle result of the unmodified surface was only 20°, because the large number of hydroxyl groups made the surface hydrophilic, while the contact angle of the modified surface was 136°.…”

Section: Assessment Of the Degree Of Hydrophobicity And Self-cleaningsupporting

confidence: 81%

“…Although the silica nanoparticles have hydroxyls in their structure and is characterized as hydrophilic, these particles can be applied in the formation of hydrophobic surfaces from their functionalization, made with the creation of another layer with the objective of reducing free surface energy 26 .…”

Section: Silica Nanoparticle Functionalization and Surface Modificationmentioning

confidence: 99%

“…The dynamic contact angle for the PMMA + NP + POTS sample performed with water was (7.5 ± 0.38) degrees, that is, the drop rolls abruptly as the goniometer table was tilted at this angle, characterizing the surface as superhydrophobic 17,25,26,27 . The other surfaces did not show a dynamic angle; even when the board was at a 90 degrees angle, the water drops did not roll.…”

Section: Samplesmentioning

confidence: 99%

See 2 more Smart Citations

Sol-gel processed Superhydrophobic Plastic Surfaces Modified with Perfluorooctyltriethoxysilane (POTS)

2019

View full text Add to dashboard Cite

Researches about nanomaterials related to properties such as superhydrophobicity, self-cleaning, corrosion and scratching resistance can be directly related to the materials' wettability. This characteristic is quantified by the contact angle made between the surface and a water droplet, in which angles above 90 degrees are considered to be hydrophobic and those above 150 degrees, superhydrophobic. The focus of this work was the development of a superhydrophobic self-cleaning surface, using silica nanoparticles with a particle diameter around 400 nm to 800 nm (produced via sol-gel, referring to the classic Stöber method) functionalized with perfluorooctyltriethoxysilane (POTS) on a polymeric substrate polymethyl methacrylate (PMMA). Four different surface treatment conditions were analyzed: untreated, treated with non-functionalized silica nanoparticles, treated only with POTS and treated with silica nanoparticles functionalized with POTS. For this last condition, a static water contact angle of (150.0 ± 0.44) degrees and a dynamic water contact angle of (7.5 ± 0.38) degrees were obtained, which is a typical value of a superhydrophobic surface. However, the surface treated with POTS alone had a contact angle of 115 degrees. The high contact angle value was due to the low surface energy obtained, which was of (1.45 ± 0.02) dyn/cm. The modified superhydrophobic surface revealed a superior self-cleaning performance by freely rolling spherical water drops on the non-wettable solid surface. The stability of the modified surface has been proven by water jet impact.

show abstract

Section: Assessment Of the Degree Of Hydrophobicity And Self-cleaningsupporting

confidence: 81%

Section: Silica Nanoparticle Functionalization and Surface Modificationmentioning

confidence: 99%

Section: Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Sol-gel processed Superhydrophobic Plastic Surfaces Modified with Perfluorooctyltriethoxysilane (POTS)

2019

View full text Add to dashboard Cite

show abstract

“…Silica nanoparticles, which present hydrophilic properties, can be modified during their synthesis by adding a coupling agent such as silane or sodium sulphate, which confers hydrophobic properties and prevents nanoparticle agglomeration [21,22]. These products are generally composed of hydrophobic hybrid crystalline SiO 2 -TiO 2 nanoparticles with a crystallite size equal to 5-20 nm [23,24].…”

Section: Substratesmentioning

confidence: 99%

Effect of Hygrothermal Aging on Hydrophobic Treatments Applied to Building Exterior Claddings

et al. 2020

View full text Add to dashboard Cite

Hydrophobic materials are among the most commonly used coatings for building exterior cladding. In fact, these products are easily applied to an existing surface, significantly reduce water absorption and have a minimal impact on the aesthetic properties. On the other hand, although these products have a proven effectiveness, their long-term durability to weathering has not yet been systematically studied and completely understood. For these reasons, this study aims to correlate the effect of artificial aging on the moisture transport properties of hydrophobic treatments when applied on building exterior claddings. Three hydrophobic products (an SiO 2 -TiO 2 nanostructured dispersion; a silane/oligomeric siloxane; and a siloxane) were applied on samples of limestone and of a cement-based mortar. The moisture transport properties (water absorption, drying, water vapor permeability) of untreated and treated specimens were characterized. Furthermore, the long-term durability of the specimens was evaluated by artificial aging, that is, hygrothermal cycles (freeze-thaw and hot-cold). All treatments have significant hydrophobic effectiveness and improve the long term-durability of the treated specimens. However, the results showed that the three hydrophobic products have different effectiveness and durability, with the SiO 2 -TiO 2 nanostructured dispersion being the most durable treatment on limestone, and the siloxane the most suitable for cementitious mortar.

show abstract

“…The silanols formed by hydrolysis of silane-coupling agent can dehydrate and condense with the silanols on the surface of silica to form silyl ether, which is chemically bonded to the surface of silica to prevent the formation of silica aggregates. [16][17][18][19][20][21] Surface coating of silica with surfactants had also been proved to be effective. Studies had shown that it was because the surface of silica was covered by surfactant, which reduced the exposure of the silanols.…”

Section: Introductionmentioning

confidence: 99%

Preparation and performance of oleylamine modified silica‐reinforced natural rubber composites

Mei

Geng

Han

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Oleylamine (OA) modified silica (SiO 2-g-OA) was prepared using γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560) and OA, silica/natural rubber (NR) and SiO 2-g-OA/NR composites were prepared by mechanical blending in an internal mixer, and SiO 2-g-OA was characterized by Fourier transform infrared spectroscopy, thermal gravimetric analyzer, and contact angle analyzer. The mechanical properties, abrasion resistance, curing characteristics, Payne effect, and morphology of silica/NR and SiO 2-g-OA /NR composites were investigated using universal testing machine, Akron abrasion tester, rubber processing analyzer, and scanning electron microscope, respectively. The results showed that SiO 2-g-OA became more hydrophobic and had better compatibility with NR. Moreover, SiO 2-g-OA/NR had weaker Payne effect, better vulcanization performance, and more excellent mechanical properties. As the content of filler was more than 30 phr, SiO 2-g-OA/NR had lower rolling resistance and higher wet skid resistance. Compared with silica modified by other coupling agents, SiO 2-g-OA had the best reinforcement effect on NR.

show abstract

Coupling of synthesis and modification to produce hydrophobic or functionalized nano-silica particles

Cited by 26 publications

References 44 publications

Sol-gel processed Superhydrophobic Plastic Surfaces Modified with Perfluorooctyltriethoxysilane (POTS)

Sol-gel processed Superhydrophobic Plastic Surfaces Modified with Perfluorooctyltriethoxysilane (POTS)

Effect of Hygrothermal Aging on Hydrophobic Treatments Applied to Building Exterior Claddings

Preparation and performance of oleylamine modified silica‐reinforced natural rubber composites

Contact Info

Product

Resources

About