Evaluation of laser cleaning for the restoration of tarnished silver artifacts
نویسندگان
چکیده
In this study we evaluate the laser cleaning of tarnished pure and sterling silver substrates using a nanosecond Q-switched Nd:YAG laser at 1064, 532 and 266 nm. To assess the effects associated with cyclic laser cleaning treatments, several cycles of tarnishing followed by laser cleaning were applied on silver coupons that were characterized by gravimetry, colorimetry, scanning electron microscopy, X-ray photoelectron spectroscopy and micro-Raman spectroscopy. According to the obtained results, none of the three wavelengths is recommended for laser cleaning of pure silver objects, while for sterling silver artifacts, the visible laser wavelength of 532 nm seems the most appropriate.
منابع مشابه
مروری بر کاربرد فناوری پلاسما در حفاظت آثار فرهنگی و تاریخی
Nowadays, over time and increasing the awareness of the destructive effects of the use of chemical and toxic substances on the objects, the environment and users, the replacement or, minimum use of these harmful materials in the treatment and protection of valuable and rare objects is a priority. So throughout the world, researchers are seeking to develop and use safe and standard methods in th...
متن کاملEvaluation of Diode laser (940 nm) irradiation effect on microleakage in class V composite restoration before and after adhesive application
Introduction: Nowadays, the main focus of dental studies is on adhesive dental materials; since clinical long-term success of bonded restorations depended more on marginal microleakage minimization. So, the aim of this study was Evaluation of Diode laser irradiation effect on microleakage in class V composite restoration before and after adhesive application. Materials and methods: In this in v...
متن کاملMechanisms Involved in Osmotic Backwashing of Fouled Forward Osmosis (FO) Membranes
Organic matter leads to one of the biggest problems in membranes: fouling. Developing efficient cleaning processes is therefore crucial. This study systematically examines how alginic acid fouling formed under different physical and chemical conditions affect osmotic backwashing cleaning efficiency in forward osmosis (FO). The fouling layer thickness before and after osmotic backwashing was mea...
متن کاملThe sulfidation process of sterling silver in different corrosive environments: impact of the process on the surface films formed and consequences for the conservation-restoration community
Background: Precious objects made of silver and/or its alloys tarnish and become black when exposed to ambient atmospheres containing moisture and ppb-amounts of H2S. Such objects usually contain small but variable amounts of copper as alloying constituent and this affects the corrosion process due to a preferential oxidation of copper. However the visual appearance of the formed tarnishing lay...
متن کاملMicroleakage of cervical cavities prepared by an Er:YAG laser or a high-speed handpiece, after restoration using resin composite
Objectives: The purpose of this in vitro study was to evaluate the microleakage of cervical cavities prepared by Er:YAG laser or high-speed hand piece and bur. Methods: This in vitro experimental study was performed on 40 sound permanent third molar teeth randomly assigned into two equal groups (n=20). In the first group, high-speed hand piece and bur and in the second group Er:YAG la...
متن کامل