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A. Rosales
Graduate and Research Division, Engineering Faculty, Universidad Autónoma de Querétaro, Cerro de las Campanas, Santiago de Querétaro 76010, Querétro, Mexico

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Journal article
Published: 03 February 2021 in Ultrasonics Sonochemistry
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Among the different properties of the hydrophobic semiconductor surfaces, self-cleaning promoted by solar illumination is probably one of the most attractive from the technological point of view. The use of sonochemistry for nanomaterials' synthesis has been recently employed for the associated shorter reaction times and efficient route for control over crystal growth and the management of the resulting material's photocatalytic properties. Moreover, the sol–gel method coupled to sonochemistry modifies the chemical environment, with reactive species such as •OH and H2O2, which yield a homogeneous synthesis. Therefore, in the following investigation, the sol–gel method was coupled to sonochemistry to synthesize a [email protected] composite, for which the sonochemical amplitude of irradiation was varied to determine its effect on the morphology and mechanical and self-cleaning properties. SEM and AFM characterized the samples of [email protected] composite, and while the micrographs indicate that a high ultrasonic energy results in an amorphous [email protected] composite with a low rugosity, which was affected in the determination of the contact angle on the surface. On the other hand, FTIR analysis suggests a significant change in both SiO2-SiO and SiO2-TiO2 chemical bonds with changes in vibrations and frequency, corroborating an important influence of the sonochemical energy contribution to the hydrolysis process. Raman spectroscopy confirms the presence of an amorphous phase of silicon dioxide; however, the vibrations of TiO2 were not visible. The evaluation of hydrophobic and self-cleaning properties shows a maximum of ultrasonic energy needed to improve the contact angle and rhodamine B (RhB) removal.

ACS Style

A. Rosales; L. Ortiz-Frade; Iliana E. Medina-Ramirez; Luis A. Godínez; K. Esquivel. Self-cleaning of SiO2-TiO2 coating: Effect of sonochemical synthetic parameters on the morphological, mechanical, and photocatalytic properties of the films. Ultrasonics Sonochemistry 2021, 73, 105483 .

AMA Style

A. Rosales, L. Ortiz-Frade, Iliana E. Medina-Ramirez, Luis A. Godínez, K. Esquivel. Self-cleaning of SiO2-TiO2 coating: Effect of sonochemical synthetic parameters on the morphological, mechanical, and photocatalytic properties of the films. Ultrasonics Sonochemistry. 2021; 73 ():105483.

Chicago/Turabian Style

A. Rosales; L. Ortiz-Frade; Iliana E. Medina-Ramirez; Luis A. Godínez; K. Esquivel. 2021. "Self-cleaning of SiO2-TiO2 coating: Effect of sonochemical synthetic parameters on the morphological, mechanical, and photocatalytic properties of the films." Ultrasonics Sonochemistry 73, no. : 105483.

Review
Published: 02 February 2020 in Catalysts
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Titanium dioxide is well known for its photocatalytic properties and low toxicity, meanwhile, silicone dioxide exhibits hydrophobic and hydrophilic properties and thermal stability. The union of these two materials offers a composite material with a wide range of applications that relate directly to the combined properties. The SiO2-TiO2 composite has been synthesized through physical methods and chemical methods and, with adequate conditions, morphology, crystallinity, boundaries between SiO2-TiO2, among other properties, can be controlled. Thus, the applications of this composite are wide for surface applications, being primarily used as powder or coating. However, the available research information on this kind of composite material is still novel, therefore research in this field is still needed in order to clarify all the physical and chemical properties of the material. This review aims to encompass the available methods of synthesis of SiO2-TiO2 composite with modifiers or dopants, the application and known chemical and physical properties in surfaces such as glass, mortar and textile, including aspects for the development of this material.

ACS Style

Alicia Rosales; Karen Esquivel. [email protected] Composite Synthesis and Its Hydrophobic Applications: A Review. Catalysts 2020, 10, 171 .

AMA Style

Alicia Rosales, Karen Esquivel. [email protected] Composite Synthesis and Its Hydrophobic Applications: A Review. Catalysts. 2020; 10 (2):171.

Chicago/Turabian Style

Alicia Rosales; Karen Esquivel. 2020. "[email protected] Composite Synthesis and Its Hydrophobic Applications: A Review." Catalysts 10, no. 2: 171.

Journal article
Published: 24 March 2018 in Coatings
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Use of silicon dioxide (SiO2) and titanium dioxide (TiO2) have been widely investigated individually in coatings technology, but their combined properties promote compatibility for different innovative applications. For example, the photocatalytic properties of TiO2 coatings, when exposed to UV light, have interesting environmental applications, such as air purification, self-cleaning and antibacterial properties. However, as reported in different pilot projects, serious durability problems, associated with the adhesion between the substrate and TiO2, have been evidenced. Thus, the aim of this work is to synthesize SiO2 together with TiO2 to increase the durability of the photocatalytic coating without affecting its photocatalytic potential. Therefore, synthesis using sonochemistry, synthesis without sonochemistry, physical characterization, photocatalytic evaluation, and durability of the SiO2, [email protected] and TiO2 coatings are presented. Results indicate that using SiO2 improved the durability of the TiO2 coating without affecting its photocatalytic properties. Thus, this novel [email protected] coating shows potential for developing long-lasting, self-cleaning and air-purifying construction materials.

ACS Style

A. Rosales; A. Maury-Ramírez; R. Mejía-De Gutiérrez; C. Guzmán; K. Esquivel. SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation. Coatings 2018, 8, 120 .

AMA Style

A. Rosales, A. Maury-Ramírez, R. Mejía-De Gutiérrez, C. Guzmán, K. Esquivel. SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation. Coatings. 2018; 8 (4):120.

Chicago/Turabian Style

A. Rosales; A. Maury-Ramírez; R. Mejía-De Gutiérrez; C. Guzmán; K. Esquivel. 2018. "SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation." Coatings 8, no. 4: 120.