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Microbecide® TiO2Ag Photo Catalytic Oxidation (PCO) Antimicrobial Sealant

TiO2Ag Product Specification

Microbecide® Photo Catalytic Oxidation (PCO) antimicrobial sealant is a nano sol (aqueous) form with a super high surface area. Our PCO antimicrobial sealant products are manufactured in a different, proprietary process as compared to powder (anhydrous) forms of production. Our proprietary processes assemble the nano particles in water directly by charging the protective layers of sol to keep the sealant complex stable. We use proprietary technology to physically charge the potential of all particles.

This charged layer prevents the nano particles from linking together in the water system, providing perfect dispersion. Upon installation, when the sol begins to dry the charged potential disappears as the carrier (water) evaporates. This drying process is more similar to an organic polymer linking process, the nano particles in the sol reunite together. Upon applicaton with an electrostatic sprayer, the carrier evaporates within seconds.

The particles do not simply agglomerate, they build up a three dimensional lattice film structure of high porosity. More than 70% of the film will be air with the nano particles forming a crystal-like framework (skeleton). These complex particles are no longer nano because the size of the framework is a much larger particle size. Due to the porous structure, the surface area of the particles are quite large, up to 160-240 sqm /g.

Our aqua system is a nont-toxic, non-corrosive antimicrobial sol, we do not form any nano or solid (anhydrous) particle and our sol-gel process can be completed at room temperature. At the edge, each single crystal still has a “nano quantum effect” of an electron-hole pair, while the recombination rate is delayed by the Ag-doped particles enhancing photocatalytic activity.

Enhanced Reactivity of Microbecide® PCO Antimicrobial Sealant.

Active Surface

TiO2 (titanium dioxide), a photocatalytic agent, well known for its high photoreactivity, broad-spectrum antimicrobial and chemical stability, has been used extensively against different groups of microorganisms including bacteria, fungi and viruses. The photocatalytic activity of TiO2 nanoparticles depends not only on the properties of the TiO2 material itself, but also on the modification of TiO2 with metal or metal oxide. The addition of noble metal (such as silver) to titanium dioxide enhances its photocatalytic efficiency. The doping process deposits Ag on the surface of TiO2 nanoparticles. This increases the value of the e--h+ charge separation by decreasing the band-gap energy, and leads to a delay in the recombination rate enhancing photocatalytic activity.

The term “band gap” refers to the energy difference between the top of the valence band to the bottom of the conduction band of a semiconductor or nanomaterial. Band gap energy is the specific minimum amount of energy required for an electron to jump from a valence band to a conduction band. The band gap energy of insulators is large (> 4eV), but lower (< 3eV) for semiconductors and nanomaterials such as titanium dioxide (TiO2).

Optical band-gap energies decrease with the doping of silver ions, which allow the delay in recombination rate and enhance photocatalytic activity. The photocatalytic activity of silver-doped TiO2 nanoparticles is significantly higher in comparison to TiO2 nanoparticles. The absorption edge of TiO2 nanoparticles at 385 nm is in the ultra violet light range. After doping with silver the response of TiO2 nanoparticles to visible light is increased and shows red shift (towards increased wavelength) showing the absorption edge at 435 nm to 450 nm (visible region).

Ag-doped TiO2 also shows more antimicrobial activity on Gram-negative bacteria because Gram-positive bacteria have more peptidoglycan than Gram-negative in the cell wall, which is negatively charged, and more silver ions may get trapped to peptidoglycan in Gram-positive bacteria. It has been demonstrated that the percentage of survivable bacteria is exponentially reduced with respect to an increasing concentration of Ag doped into the TiO2 matrix.

Microbecide® PCO Sealant Safety.

bandgap The PCO sol form provides the highest safety to the end user and installers. There is no super-fine powder in the entire process, from manufacture through installation in a customer´s facility. Microbecide® PCO Sealant creates a protective "Active Surface" barrier that provides an active antimicrobial function for up to a year or more on PCO Sealant coated surfaces.

Support Documents

  1. Request More Info & Quote
  2. Microbecide® TiO2Ag PCO Antimicrobial Sealant Overview 
  3. Microbecide® TiO2Ag PCO Sealant Product Specification 
  4. Microbecide® TiO2Ag PCO Sealant Product Warranty 
  5. Nano Coating Using Electrostatics – How It Works 
  6. ISO-Class 7 Certified, GMP Manufacturing Facility
  7. EU SelfClean Project - TiO2
  8. Weir, Alex et al. "Titanium Dioxide Nanoparticles in Food and Personal Care Products."; Environmental science & technology 46.4 (2012): 2242–2250. PMC. Web. 19 Sept. 2015.

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