The use of objects and methods of colloid chemistry in nanochemistry

Summ, B. D.; Иванова, Н. И.

doi:10.1070/rc2000v069n11abeh000616

Cited by 38 publications

(22 citation statements)

References 124 publications

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“…The data on contact angles measured at the film/water/air interfacial boundary (Table 3) showed that, in the case of the EC film, contact angle θ for water droplets is above 90°; that is, the film of the indi vidual polymer is hydrophobic. The incorporation of silicon and titanium compounds in the hybrid films causes decreases in the contact angles and increases in cosθ and the energies of interaction of the films with water, W a , as is typical for improvement of the hydro philic behavior of a material [20]. As is seen from Table 3, for the TiO 2 containing films of comparable compositions, the numerical values of cosθ and W а are somewhat higher than those for EC-Si films.…”

Section: Effects Of Modifiers On the Hydrophilicity Levels Of Ec Hybrmentioning

confidence: 66%

“…The contact angles for water droplets at the film surface/air boundary was calculated from the geometrical dimensions of the base and the height of 5-7 droplets that were mea sured with the use of a cathetometer (with a precision of up to ±0.0005 m) [20]. The error in contact angle θ measurements did not exceed ±0.2°.…”

Section: Objects and Analytical Methodsmentioning

confidence: 99%

“…The cosine of the contact angle is the measure of wetting. From the value of cosθ and the surface tension of water, σ w , at 25°C, work of adhesion W a of water to a film was cal culated via the following relationship [20]:…”

Section: Objects and Analytical Methodsmentioning

confidence: 99%

“…Similar data were obtained for EC hybrid films of other com positions: All films containing titanium had larger structures on the surfaces. As is known [20], the roughness of a surface influences the adhesion and sorption properties of a material.…”

Section: Characteristics Of the Surfaces Of Hybrid Filmsmentioning

confidence: 99%

“…It is well known [20] that the properties of a solid sur face, specifically its roughness, affect its wetting. The common result of incorporation of silicon or titanium compounds in the films of the hydrophobic polymer EC is that the hydrophilicity levels of the surfaces are improved with increases in the amounts of Si and Ti modifiers in the films; therefore, these films are appli cable for operation in aqueous media.…”

Section: Effects Of Modifiers On the Hydrophilicity Levels Of Ec Hybrmentioning

confidence: 99%

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Preparation and properties of silicon- and titanium-containing hybrid nanocomposite films based on ethyl cellulose

et al. 2013

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Abstract-Nanocomposite hybrid films containing silicon and titanium compounds in the polymer matrix are prepared through the sol gel method via the hydrolytic polycondensation of Si and Ti alkoxides (tetra ethoxysilane and titanium tetrabutoxide) in the THF solution of a hydrophobic polymer, ethyl cellulose. Their structure and properties are studied with the use of a complex of physicochemical methods. During the hydrolysis of tetraethoxysilane and the subsequent polycondensation of the reaction products, silicon atoms are incorporated into the polymer and form -O-Si-O-bonds involving hydroxyl groups of ethyl cellulose. In the sol gel method, titanium alkoxide yields nanosized particles of titanium dioxide that play the role of fillers in the polymer matrix. Titanium containing films show solubility in THF and, after prolonged contact with the solvent, precipitate titanium dioxide from the solution. Hybrid films containing silicon are insoluble owing to the formation of a chemical network between polymer molecules and Si-OH groups of the products of hydrolysis of silicon alkoxide, as confirmed by the IR data. It is shown that the amounts and types of alkox ides and the diameters of the structures formed in the polymer matrix via the sol gel procedure affect the hydrophilicity levels of ethyl cellulose hybrid films and their abilities to swell in water and aqueous solutions of organic dyes (brilliant blue and methylene blue). Ethyl cellulose hybrid films are hydrophilic, and they facilitate the removal of dye molecules from aqueous solutions. The best properties are featured by the films containing nanosized particles of titanium dioxide in the polymer matrix.

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Section: Effects Of Modifiers On the Hydrophilicity Levels Of Ec Hybrmentioning

confidence: 66%

Section: Objects and Analytical Methodsmentioning

confidence: 99%

Section: Objects and Analytical Methodsmentioning

confidence: 99%

Section: Characteristics Of the Surfaces Of Hybrid Filmsmentioning

confidence: 99%

Section: Effects Of Modifiers On the Hydrophilicity Levels Of Ec Hybrmentioning

confidence: 99%

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