5 documents found, page 1 of 1
Plasma enhanced chemical vapor deposition (PECVD) of SiOx thin films on Portugu...
Schiavon, Nicola; Ding, Yufan; Grassini, Sabrina; Angelini, EmmaPlasma Enhanced Chemical Vapor Deposition (PECVD) of SiOx thin films has been applied to the stone surface under laboratory conditions in order to assess its feasibility as an alternative method for stone protection. SiOx thin layers were deposited on oolitic limestone lithologies known to have been used for the construction and restoration of the Batalha Monastery in Portugal surface by PECVD from tetraethoxys...
Innovative conservation techniques for bio-deteriorated and soiled ornamental s...
Ding, YufanThis project aims to investigate the application of two innovative technologies - laser cleaning and plasma treatment for the conservation of limestone materials in urban environment, the Batalha Monastery, one of the most iconic monuments in Portugal was used as a case study. The thesis is divided into two parts. The first part (chapters 1-3) describes the stone, the degradation processes and their causes. The...
The inhibition of biodegradation on building limestone by plasma etching
Ding, Yufan; Caldeira, A. Teresa; Salvador, Cátia; Grassini, Sabrina; Angelini, Emma; Schiavon, NickPlasma etching is an innovative technique that has been recently applied in the cleaning of soiled archaeological objects. This research investigated the use of low-pressure plasma etching in cleaning microbial contaminations on an oolitic limestone from an UNESCO World Heritage listed monument: the Batalha Monastery in Central Portugal. The cleaning effect was assessed by FTIR, SEM, optical microscope, and cel...
On the biodiversity and biodeteriogenic activity of microbial communities prese...
Schiavon, Nicola; Ding, Yufan; Salvador, Cátia; Caldeira, Ana; Angelini, EmmaAn experimental study was conducted to assess the nature and extent of the biodeterioration of the limestone in the Batalha Monastery in Portugal. Stone fragments covered with microbial biofilms and lichenous crusts were investigated using Optical Microscopy (OM), Low Vacuum Scanning Electron Microscopy with Energy Dispersive Spectroscopy (LV-SEM + EDS), and X-ray micro-Diffractometry (-XRD). Microbial samples ...
A combined petrographic and geochemical metrological approach to assess the pro...
Schiavon, Nicola; Ding, Yufan; Mirao, José; Dias, Luis; Moita, Patricia; Redol, Pedro; Grassini, Sabrina; Angelini, EmmaTo verify the provenances of limestones that were used for construction and restoration of the Batalha Monastery, limestone quarries in central Portugal were investigated. Samples were collected from quarries and monastery in field investigation. The elements-alignment of calcium and strontium based on XRF result has suggested the source of fragments from different parts the monastery. Observation of the thin s...