Silsesquioxane-based hybrid nanocomposites with methacrylate units containing titania and/or silver nanoparticles as antibacterial/antifungal coatings for monumental stones

Aflori, Magdalena; Simionescu, B. C.; Bordianu, Irina-Elena; Săcărescu, Liviu; Varganici, Cristian–Dragos; Doroftei, Florica; Nicolescu, Alina; Olaru, Mihaela

doi:10.1016/j.mseb.2013.04.004

Cited by 55 publications

(26 citation statements)

References 31 publications

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“…Figure 2(a) showed the 1 H NMR spectrum of POSS-(PMMACl) 8 (4)(5) :H 6 is about 0.62:1.00:1.53:0.32, which was in excellent agreement with the number ratio of protons of 2:4:5:3, verifying the molecular structure of POSS-(PMMA-Cl) 8 . Figure 2( 9 5 0.91 ppm), and the integration area ratio of H (4)(5) :H 6 :H 7 :H 8 :H 9 was about 1.00:1.13:1.27:1.34:1.00. Therefore, the expected polymerization that occurred under the reaction conditions were clearly confirmed by the analysis of H NMR spectra, and the monomers have been grafted on the POSS core successfully.…”

Section: Synthesis Of Poss-methacrylate Polymersmentioning

confidence: 92%

Star‐shaped POSS–methacrylate copolymers with phenyl–triazole as terminal groups, synthesis, and the pyrolysis analysis

Qiang

Chen

et al. 2014

J of Applied Polymer Sci

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Star-shaped polyhedral oligomeric silsesquioxane (POSS)-methacrylate hybrid copolymers with phenyl-triazole as terminal groups had been designed and synthesized via sequential atom transfer radical polymerization (ATRP), azidation, and phenylacetylene-terminated procedures, and the hybrid copolymers here could be denoted as POSS-(PXMA-Pytl) 8 , where X can be M, B, L, and S, represented four different methacrylate monomers, such as methacrylate (MMA), butyl methacrylate (BMA), lauryl methacrylate (LMA), and stearyl methacrylate (SMA), respectively. Thermal gravimetric analysis (TGA) and in situ Fourier transform infrared spectroscopy (FTIR) were applied for studying the thermal stability and degradation mechanism, and it was found that all of the POSS-(PXMA-Cl) 8 and POSS-(PXMA-Pytl) 8 copolymers exhibited excellent thermal stabilities, which had great potential in heat-resistant material application. Different tendencies of decomposition temperatures at 5% and 10% weight loss (T 5 and T 10 ) dependent on the side-chain length and terminal group species were investigated respectively. The longer alkyl side chains of the monomers, the lower thermal stabilities, and enhanced T 5 and T 10 were also shown with the introduction of phenyl-triazole groups instead of chlorine groups.

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Section: Synthesis Of Poss-methacrylate Polymersmentioning

confidence: 92%

Star‐shaped POSS–methacrylate copolymers with phenyl–triazole as terminal groups, synthesis, and the pyrolysis analysis

Qiang

Chen

et al. 2014

J of Applied Polymer Sci

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“…Titanium dioxide nano-particles have been added to polymer based on acrylic [75][76][77], siloxanes [74,77], fluorinated polymers [74,75,78,79], polyurethanes [80]. Organic solvent [73,75] or aqueous suspension [73][74][75][76] can be employed.…”

Section: Preparation and Properties Of Nano-tio 2 Hybridsmentioning

confidence: 99%

Novel Attribute of Organic–Inorganic Hybrid Coatings for Protection and Preservation of Materials (Stone and Wood) Belonging to Cultural Heritage

Frigione

Lettieri

2018

Coatings

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In order to protect a material belonging to Cultural Heritage (i.e., stone, wood) from weathering, and in turn to preserve its beauty and historical value for the future generations, the contact with external harmful agents, particularly water, must be avoided, or at least limited. This task can be successfully obtained with the use of a protective organic coating. The use of nano-metric reinforcing agents in conventional polymeric coatings demonstrated to be a successful route in achieving better protective performance of the films and improved physical properties, even in extreme environments. The present paper would, therefore, review the more recent findings in this field. Generally speaking, when a hydrophobic product is applied on its surface, the stone material will absorb less water and consequently, less substances which may be harmful to it. An efficient organic coating should also supply wear and abrasion resistance, resistance to aggressive chemicals, excellent bond to the substrate; finally, it should be also able to guarantee vapor exchange between the environment and the material interior, i.e., the material should keep the same water vapor permeability as if it was un-protected. To regard to the conservation of wood artifacts, protective treatments for wood will preserve the material from environmental agents and biological attack. Hence, potential advantages of hybrid (organic–inorganic) nano-composite coatings for stone/wood have been found to be: Enhanced mechanical properties in comparison to the pure polymeric matrix, due to the reinforcing effect of the nano-filler; superior barrier properties (the presence of the nano-filler hinders the ingress of water and/or potentially harmful chemicals); optical clarity and transparency. It has been found that the efficacy of a nano-filled coating strongly depends on the effectiveness of the method used to uniformly disperse the nano-filler in the polymeric matrix. Furthermore, the presence of nano-particles should not impair the viscosity of the organic matrix, in order to employ the conventional techniques of application for coatings.

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“…Due to their excellent properties titania coatings and components have been extensively used in many applications such as antibacterial, antifungal, photocatalysis, self‐cleaning, biomedical, air and water purification and so on. Several coating methods have been used to deposit titania coatings on metallic substrates like sol gel, chemical and physical vapor deposition, thermal and plasma spraying, tape casting , and so on.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition of thick titania coatings at constant voltage by controlling current density

Farrokhi-Rad

2017

Int J Applied Ceramic Tech

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Kinetics of electrophoretic deposition (EPD) process usually slows down with time due to the reduction in effective electric field (E eff ) across the suspension. So, normally the deposition of thick coatings or 3-D objects by EPD is not possible at low voltages. The suspensions of nanometer (NT) and micrometer (MT)-sized titania particles were prepared in isopropanol, using triethanolamine (TEA) plus acetic acid (AA) as the charging additives. E eff is directly proportional to the current density. It was found that depending on the composition of suspensions, the current density and so E eff decrease, remain constant or increase during EPD from them. Current density increased during EPD from NT suspensions with 0.33 (AA≥1.33 mL/L), 0.66 (AA≥2 mL/L) and 1.33 mL/L (AA≥6.66 mL/L) TEA. However, it did not increase any of the MT suspensions, but remained nearly constant for those with 0.33 and 0.66 mL/L TEA plus AA>1.33 mL/L and AA>2 mL/L, respectively. Current density increased or remained constant during EPD from the suspensions in which majority of H + TEA ions are adsorbed on the particles surface and the zeta potential of particles is below the critical value in them (NT%70 mV and MT%60 mV). Deposition rate increased continuously during EPD from the suspensions in which current density increased for them. K E Y W O R D S current density, effective electric field (E eff ), electrophoretic deposition (EPD), kinetics, micrometersized titania particles (MT), nanometer-sized titania particles (NT)

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Silsesquioxane-based hybrid nanocomposites with methacrylate units containing titania and/or silver nanoparticles as antibacterial/antifungal coatings for monumental stones

Cited by 55 publications

References 31 publications

Star‐shaped POSS–methacrylate copolymers with phenyl–triazole as terminal groups, synthesis, and the pyrolysis analysis

Star‐shaped POSS–methacrylate copolymers with phenyl–triazole as terminal groups, synthesis, and the pyrolysis analysis

Novel Attribute of Organic–Inorganic Hybrid Coatings for Protection and Preservation of Materials (Stone and Wood) Belonging to Cultural Heritage

Electrophoretic deposition of thick titania coatings at constant voltage by controlling current density

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