Thin films made from fluorinated poly(naphthyl-imide)s containing oxadiazole rings were irradiated with UV-laser of various fluences and their morphology before and after laser ablation was investigated by using various spectroscopy techniques such as FTIR, atom force, and time-resolved emission spectroscopy.

Here we present a study of the polyimide lms nanostructur- ing by KrF laser beam irradiation and the investigation of the mechanism of cone-like structure formation at two laser uences, 57 and 240 mJ/cm2. These lms were prepared from uorinated poly(naphthyl-imide)s containing oxadia- zole rings, by casting polymer solutions onto glass plates and gradually heating. Their morphology before and after laser ablation was investigated by using var- ious

In situ organically-modified silsesquioxane nanoparticles with vinyl units were obtained combining the sol-gel technique and the radical polymerization of vinyltrimethoxysilane (VTMS) in the presence of a small amount of a cationic surfactant, i.e., cetyl trimethylammonium bromide (CTAB). The surfactant was added in order to improve the optical properties based on controlled nanophase separations. The hydrolysis and polycondensation reactions were

Total reflection Fourier transform infrared (ATR-FTIR) spectroscopy was used to assess the effectiveness of four polymeric hydrophobic coatings in the conservation of two monumental stones, originating from Spain and Romania. The selected coatings include three commercially available siloxane-based water repellent products, as well as a new hybrid nanocomposite with silsesquioxane units synthesized via the sol-gel technique. Micro-FTIR analyses were

The aim of this study was the evaluation of the excimer laser ablation effect on poly(ethylene terephthalate) (PET) film surfaces by means of atomic force microscopy (AFM), Fourier Transform Infrared - Attenuated Total Reflectance (FTIR-ATR) and contact angle measurements. Nitrogenous groups were introduced onto PET films through triethylenetetraamine (TETA) by chemical treatments. Laser ablation on both untreated and treated biaxially stretched

The effectiveness of four polymeric water repellent coatings used for the protection of two monumental limestones, commonly used as building materials in Spain and Romania, has been evaluated. The selected coatings include three commercially available siloxane-based water repellent products and a new hybrid nanocomposite with silsesquioxane units synthesized via sol-gel technique. The water repellents were applied onto the limestones, and the coating

For the present study two types of rock, from Spain and Romania, selected by regional significance, abundance and importance were characterized by powder x-ray diffraction (PXRD). The samples were prepared by casting the same amount of a silsesquioxane-based polymer obtained through sol-gel approach and radical polymerization of 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) onto powder stones. Due to the distinct stones composition, the different

The present paper reports on the evaluation of mineral composition of two porous limestones, i.e., a bioclastic limestone with large pore radii and grain size and a dolomitic one of small pore radii and grain size, used as monumental building stones, and on the influence of a new silicon-based hybrid polymer nanocomposite with silsesquioxane units (TMSPMA), used as protective coating material, on their composition and crystallographic properties.

The study was concerned with the synthesis and characterization of a silsesquioxane-based hybrid nanocomposite with self-assembling properties intended for monumental porous limestone conservation. Radical polymerization of 3-(trimethoxysilyl)propyl methacrylate in the presence of a primary amine surfactant yielded a new type of hybrid nanocomposite, in which silica was dispersed as domains with typical sizes in the nanometer range. The self-assembling

The aim of this study was to synthesize and characterize a hybrid composite based on type I hydrated collagen, hydroxyapatite and a silane precursor (amino-propyltriethoxysilane). Through sol-gel approach of the precursor and noncovalent immobilization of collagen on the surface of hydroxyapatite, a new type of hybrid material was obtained in which microspheres comprising silica and hydroxyapatite particles are dispersed in an oriented fibrous network