The works of art and artifacts that constitute our cultural heritage are subject to deterioration, both from internal external factors. Surfaces interact with the environment most prone aging decay; accordingly, soiling is a prime factor in degradation surfaces attendant disfigurement piece. Coatings were originally intended protect or contribute aesthetically an artwork should be removed if they begin have destructive impact on its appearance surface chemistry. Since mid-19th century,...

We studied the synthesis and characterization of Ca(OH)2 colloidal particles their application to restoration wall paintings. Submicrometer crystalline have been obtained by mixing equal volumes NaOH CaCl2 aqueous solutions with different degrees supersaturation (from 2 10) in temperature range 60−90 °C. The are appearance hexagonal platelets thicknesses a few nanometers, as determined scanning electron microscopy, transmission X-ray diffractometry, atomic force microscopy techniques....

The aging of cellulose, the main constituent paper, is due to depolymerization cellulose fibers and promoted by acid pH. Paper deacidification a fundamental process for conservation restoration probably most important material used transmit cultural heritage. Several methods are currently paper deacidification. We applied nanotechnologies produce kinetically stable dispersions nano- micron-sized calcium hydroxide particles in alcohol media. Although possesses best properties, it has never...

We report an investigation on the effects of counterions magnesium salts homogeneous phase precipitation reaction to yield nanoparticles. The results provide new parameters guide control size, monodispersity, crystallinity, and morphology Mg(OH)2 Evidence emerged that affect size crystallites. particle increases from about 50 200 nm follows Hofmeister anion series: sulfate < chloride nitrate ≤ perchlorate. All show a proper choice counterion composition mixture allows one modulate set...

Abstract This review describes the application of selected spectroscopic techniques to world cultural heritage conservation. In recent times, science and technology have been applied heritage, conservation preservation. this field, represent one most powerful tools investigate structure all materials constituting "cultural object." particular, survey will consider "status art" in field some important for characterization following works art: easel paintings, paper ink artifacts, stone...

-Dispersions of calcium hydroxide, Car OH) 2' in short-chain aliphatic alcohols were studied with the aim establishing a new pre-consolidation and consolidation methodology for wall paintings. The choice lime (a paste comprising calciun1 hydroxide plus water) as consolidant was suggested by physicochemical compatibility criteria, is original binder paintings treated. Many problems are encountered when trying to apply Saturated solutions too weak act consolidant, due low solubility (1·7 gl–1)...

The aim of this project was to study the preparation and characterization nanosized Ca(OH)2 particles. Synthesis particles performed at a high temperature, diols were employed as reaction media. size shape found be dependent on different experimental factors, such concentration reactants, molar ratio, aging time. Several syntheses carried out using parameters. higher solubility in than water made synthesis nanoparticles particularly difficult. used (1,2-ethanediol 1,2-propanediol) remained...

We report the development of a new type hydrogel in which cosolvent has been added to water component. The gel networks are based on well-known poly(vinyl alcohol)−borate systems (PVA−borate). However, it is shown that rheological and solubilizing properties hydrogels can be modified drastically by addition cosolvent. studies have focused 1-propanol as liquid, although others (propylene carbonate, 1-pentanol, cyclohexanone, 2-butanol) amenable making well. In measurements, gels investigated...

Biocompatible chitosan/gold nanorods films are fabricated and tested as laser-activatable adhesives. When exposed to near-infrared laser light the nanoparticles carry out efficient photothermal conversion, which activates polar groups of chitosan strands mediates functional adhesion with a biological tissue. This technology may enable number key applications in medicine including tissue repair, wound dressing drug delivery. Detailed facts importance specialist readers published "Supporting...

The synthesis and characterization of a novel series polymer gels are reported. They formed at ambient temperatures by bubbling CO2 through solutions polyallylamine (PAA; latent gellant) in several organic liquids, including aliphatic alcohols 1-methyl-2-pyrrolidone. stabilities the alcohol gels, as indicated (irreversible) degelation temperature, Tgdt, were strongly dependent on number carbon atoms (Cn) alkyl chains liquids. mechanism formation microenvironmental properties PAA-based...

This study reports the physicochemical investigation of oil-in-water (o/w) microemulsions and micellar solutions formulated to solubilize acrylic vinyl polymers. Three different four-component systems formed from (i) water, p-xylene, sodium dodecylsulfate, 1-pentanol; (ii) propylene carbonate, (iii) Tween-20, 1,2-ethandiol, one five-component system (water, commercial nitro-diluent, 1-pentanol) have been studied. The o/w or (system ii) characterized by quasi-elastic light scattering...

A form of soft matter, physical gels, has been exploited for many practical purposes several centuries. During the last decade, types gels have developed to clean surfaces art conservation and restoration. short history an explanation structures properties these recent modifications them by authors allow "isothermal rheoreversibility" are described. Speculation about future developments factors that should be considered when formulating restoration is presented.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR study of sodium dodecyl sulfate and dodecyltrimethylammonium bromide micellar solutions: effect ureaPiero. Baglioni, Elisabeth. Rivara-Minten, Luigi. Dei, Enzo. FerroniCite this: J. Phys. Chem. 1990, 94, 21, 8218–8222Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pubs.acs.org/doi/10.1021/j100384a044https://doi.org/10.1021/j100384a044research-articleACS...

When investigated under high concentration conditions, hyaluronan (HA) solutions in physiological saline are shown to generate stable superstructures. An abrupt change the rheological properties observed on increasing temperature suggests breaking of certain cooperative bonds. The thermal disruption HA superstructure is accompanied by a sharp transition from long- restricted-connectivity water structuring, which interpreted as concurrent temporary polymer network. intermolecular associations...

A gel-like, high-viscosity polymeric dispersion (HVPD) based on cross-linked borate, partially hydrolyzed poly(vinyl acetate) (xPVAc, where x is the percent hydrolysis) described. Unlike hydro-HVPDs prepared from alcohol) (PVA) and liquid portion of these materials can be composed up to 75% an organic cosolvent because influence residual acetate groups polymer backbone. The effects degree hydrolysis, molecular weight, cross-linker concentrations, type amount rheological structural properties...

The preparation and structural characterization of a family viscoelastic dispersions borate cross-linked, 80% hydrolyzed poly(vinyl acetate) (80PVAc) in aqueous-organic liquids are presented. Correlations between mechanical properties (from rheological measurements) the degree nature cross-linking (11)B NMR spectroscopy) reported, results used to assess their potential as low-impact cleaning agents for surfaces paintings. Because can be prepared at room temperature by simple procedures from...

Cellulose acetate (CA) motion picture films are subjected to degradation especially due the “vinegar syndrome”, a de-acetylation process catalyzed by high temperature, humidity, and acidity. Acetic acid is released as by-product of this reaction acts catalyst that triggers an autocatalytic process. The main aim study was evaluate use metal oxide, hydroxide, carbonate nanoparticles, well their composite inorganic-organic systems, for ad-sorption acetic inhibition deacetylation Various...

Cellulose acetate (CA) motion picture films are subjected to degradation, especially due the “vinegar syndrome”, a de-acetylation process catalyzed by high temperature, humidity, and acidity. Acetic acid is released as by-product of this reaction acts catalyst that triggers an autocatalytic process. The main aim study was evaluate use metal oxide, hydroxide, carbonate nanoparticles, well their composite inorganic–organic systems, for adsorption acetic inhibition deacetylation Various...

The aim of this study was the synthesis and physicochemical characterization Ca(OH)2 nanoparticles. carried out in ternary water-in-oil microemulsions where oil phase cyclohexane; two different microemulsion systems were investigated changing nonionic surfactant from tetraethylene-glycol-monododecyl ether (C12E4) to pentaoxyethylene-glycol-nonyl-phenyl (Igepal−CO520). Phase diagrams studied presence high concentration Ca2+ or OH- aqueous pool, allowing determination optimum concentrations...