Intermolecular And Surface Forces

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Properties Of Concrete

Nanotechnology in concrete – A review

Studying nature to reveal the mechanisms of special wetting phenomena in biological systems can effectively inspire the design and fabrication of functional interfacial materials with superwettability. In this Review, the historical development, new phenomena and emerging applications of superwettability systems are discussed.

Nature-inspired superwettability systems

Ice repellency can be achieved on various hydrophilic and hydrophobic surfaces, although a surface that repels ice under all environmental scenarios remains elusive. Different strategies are reviewed with a focus on the recent development of superhydrophobic and lubricant-infused surfaces.

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Design of anti-icing surfaces: smooth, textured or slippery?

Successfully mimicking nature's bottom-up construction processes is one of the most promising directions.

How Nanotechnology Can Change the Concrete World

The term “icephobicity” has emerged in the literature recently. An extensive discussion took place on whether the icephobicity is related to the superhydrophobicity and the consensus is that there is no direct correlation. Besides the parallel between the icephobicity and superhydrophobicity for water/ice repellency, there are similarities on other levels including the hydrophobic effect/hydrophobic interactions, mechanisms of protein folding and ice crystal formation. In this paper, we report how ice adhesion is different from water using force balance analysis and why superhydrophobic surfaces are not necessary icephobic. We also present experimental data on anti-icing of various surfaces and suggest a definition of icephobicity, which is broad enough to cover a variety of situations relevant to de-icing including low adhesion strength and delayed ice crystallization and bouncing.

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From superhydrophobicity to icephobicity: forces and interaction analysis

The reported research examined the effect of 5-70 nm SiO2 nanoparticles on the mechanical properties of nano-cement materials The strength development of portland cement with nano-SiO2 and superplasticizing admixture was investigated Experimental results demonstrate an increase in the compressive and flexural strength of mortars with developed nanoparticles The distribution of nano-SiO2 particles within the cement paste plays an essential role and governs the overall performance of these products Therefore, the addition of a superplasticizer was proposed to facilitate the distribution of nano-SiO2 particles Superplasticized mortars with 025% of selected nano-SiO2 demonstrated a 16% increase of 1-day compressive strength, reaching 639 MPa; the 28-day strength of these mortars was 959 MPa (vs strength of reference superplasticized mortars of 921 MPa) Increase of 28-day flexural strength of superplasticized mortars with selected nano-SiO2 was 18%, reaching 271 MPa It is concluded that the effective dispersion of nanoparticles is essential to obtain composite materials with improved performance

Engineering of SiO 2 Nanoparticles for Optimal Performance in Nano Cement-Based Materials

We report here, for the first time in the literature, a method to synthesize hydrophobic and superhydrophobic concrete. Concrete is normally a hydrophilic material, which significantly reduces the durability of concrete structures and pavements. To synthesize water-repellent concrete, hydrophobic emulsions were fabricated and applied on portland cement mortar tiles. The emulsion was enriched with the polymethyl-hydrogen siloxane oil hydrophobic agent as well as metakaolin (MK) or silica fume (SF) to induce the microroughness and polyvinyl alcohol (PVA) fibers to create hierarchical surfaces. Various emulsion types were investigated by using different mixing procedures, and single- and double-layer hydrophobic coatings were applied. The emulsions and coatings were characterized with optical microscope and scanning electron microscope (SEM), and their wetting properties, including the water contact angle (CA) and roll-off angle, were measured. A theoretical model for coated and non-coated concrete, which ca...

Konstantin Sobolev

Papers

Nanotechnology in concrete – A review

How Nanotechnology Can Change the Concrete World

From superhydrophobicity to icephobicity: forces and interaction analysis

Engineering of SiO 2 Nanoparticles for Optimal Performance in Nano Cement-Based Materials

Self-assembling particle-siloxane coatings for superhydrophobic concrete.