Preparation and investigation of hydrophilic, photocatalytic, and antibacterial polyacrylic latex coating containing nanostructured TiO2/Ag+-exchanged-montmorillonite composite material

Abstract

In order to prepare a self cleaning and antibacterial coating, nanostructured TiO 2 /Ag +exchanged-montmorillonite composite material was prepared and used as additive in a commercial grade polyacrylic latex coating. FT-IR and UV-visible spectroscopy, X-ray diffraction patterns and FESEM were used to characterize the composition and structure of the nanocomposites and coatings. The polyacrylic coatings, prepared by the using of TiO 2 /Ag +-exchanged-montmorillonite additive, showed better UV and visible light absorption, hydrophilic property, photodegradation of organic pollutants, stability in water and antibacterial properties than pristine commercial grade polyacrylic latex coating. According to the results, the modified polyacrylic coating containing 3%w of nanostructured TiO 2 /Ag +-exchanged-montmorillonite composite material as additive, with TiO 2 to Ag +-exchanged-montmorillonite ratio of 2:1, was the best coating considering most of the useful properties such as low water contact angle, high photodegradation efficiency, and high water resistivity. The water contact angle for unmodified polyacrylic latex coating was 68° while it was decreased to about 10º or less for modified coating after 24h LED lamp illumination.

Multifunctional Epoxy/Nanocomposites Based on Natural Moroccan Clays with High Antimicrobial Activity: Morphological, Thermal and Mechanical Properties

“…It is noteworthy that the biocidal activity of the nanocomposites described here is comparable with the data reported for nanocomposites loading silver ions, which are the most used bactericidal agents [69,70]. As an example, TiO 2 /Ag + exchanged montmorillonite in polyacrylic latex coatings produced an antibacterial effect at 1% wt content [69], and a similar effect was reported for silver-embedded epoxy/clay nanocomposites at 2.5% wt content [38].…”

Effect of “Z” factor for strength of interphase layers on the tensile strength of polymer nanocomposites

“…Polymer nanocomposites are a class of hybrid materials, which have generated a great interest in research and industry, due to their potentially novel properties, which are not existent in other materials . They have found many applications in a wide range of industries, such as automotive, civil construction, sport and aerospace in recent years.…”

Synthesis of TiO2 based Self Cleaning Superhydrophilic Thin Film Coating

“…Table I illustrates the variation of Titanium isopropoxide. 2 gets activated under sunlight due to photocatalytic activity. The metallic ions formed interact with atmospheric oxygen and water molecules giving hydroxyl ions as the end product.…”

“…These coating prevent the micro water droplets to condense on the surface keeping it clean. [1] [2]. Scientists have recently discovered the anti-biofouling properties of superhdrophilic coating, the property of a surface to prevent the accumulation of microorganisms, plants, algae, animals or contaminants on the wetted surface.…”

“…Scientists have recently discovered the anti-biofouling properties of superhdrophilic coating, the property of a surface to prevent the accumulation of microorganisms, plants, algae, animals or contaminants on the wetted surface. [2] These coatings find their way in anti-baterial, anti-stain [3][4], fingerprint resistant, non-toxicity, self cleaning, water purification, paint industry [5][6] and various medicinal applications. The applications of TiO 2 based coating are very extensive and only limited to our ability of thinking.…”