This page has only limited features, please log in for full access.
Conservation strategies to reduce the degradation of stone caused by the action of water are focusing on increasing the hydrophobicity of the surface by imitating existing solutions in nature (lotus leafs and others). These are mainly based on the existence of hierarchical roughness with micro- and nanoscale structures. In the case of marble, research has focused on protective coatings that sometimes are dangerous for the health and the environment, and with undesirable effects such as color changes or reduction of water vapor permeability of the stone. Laser texturing, however, is an environmentally friendly technique, because no chemicals or toxic waste are added and, moreover, it can process nearly all types of materials. It has been used to change the surface texture of metals and other materials on a micro or even nanometric scale, to meet a specific functional requirement, such as hydrophobicity. The objective of this work was to analyze the feasibility of this technique to provide hydrophobic properties to a marble surface without appreciable changes in its appearance. Therefore, an analysis of the irradiation parameters with ultra-short-pulse laser was performed. Preliminary results demonstrate the ability of this technique to provide hydrophobic character the marble (contact angles well above 90 ∘ ). Besides, the analysis of the treated surfaces in terms of roughness, color and gloss indicates that changes in the appearance of the surface are minimal when properly selecting the process parameters.
Ana J. López; Alberto Ramil; José S. Pozo-Antonio; Teresa Rivas; Dolores Pereira. Ultrafast Laser Surface Texturing: A Sustainable Tool to Modify Wettability Properties of Marble. Sustainability 2019, 11, 4079 .
AMA StyleAna J. López, Alberto Ramil, José S. Pozo-Antonio, Teresa Rivas, Dolores Pereira. Ultrafast Laser Surface Texturing: A Sustainable Tool to Modify Wettability Properties of Marble. Sustainability. 2019; 11 (15):4079.
Chicago/Turabian StyleAna J. López; Alberto Ramil; José S. Pozo-Antonio; Teresa Rivas; Dolores Pereira. 2019. "Ultrafast Laser Surface Texturing: A Sustainable Tool to Modify Wettability Properties of Marble." Sustainability 11, no. 15: 4079.
Recently, the field of archaeology has seen an increasing use of artificial neural networks (ANNs). ANNs are adaptive computational algorithms inspired by the structure and functioning of the human brain, which are able to learn by generalization from a set of training data. Their success in the field of archaeology comes from their ability to model complex processes, intrinsically nonlinear, and from their flexibility to adapt to different applications, in general related to classification, prediction, or identification problems in almost any scientific area. The most widely used models among ANNs have been the multilayer perceptron (MLP) and self‐organizing maps (SOM). Their applications are mainly included in two wide research areas: the location of geographic areas with high archaeological potential, and the classification of archaeological materials or sites. In both cases, a number of examples in the scientific literature confirm the success of ANNs and show them as a promising tool for other archaeological problems.
Ana J. López; Alberto Ramil. Neural Networks. The Encyclopedia of Archaeological Sciences 2018, 1 -4.
AMA StyleAna J. López, Alberto Ramil. Neural Networks. The Encyclopedia of Archaeological Sciences. 2018; ():1-4.
Chicago/Turabian StyleAna J. López; Alberto Ramil. 2018. "Neural Networks." The Encyclopedia of Archaeological Sciences , no. : 1-4.
Cleaning effectiveness of four graffiti spray paints artificially aged by SO2 exposure on granite was evaluated. Two different removal procedures were applied: i) mechanical methods with different micro abrasives (Hydrogommage® – combining action of air, water and micro abrasive-silica or aluminium silicate and IBIX® – combining action of air and micro abrasive-silica or calcium carbonate), and ii) a ns Nd:YVO4 laser working at 355 nm. It was concluded that the cleaning with mechanical procedures and laser was influenced by the SO2 exposure. Aged samples were more difficult to clean, suffering higher global colour changes. Hydrogommage® with silica abrasive achieved the best results, due to a combination of a satisfactory paint extraction and low morphological damages induced to the granite.
Vera Gomes; Amélia Dionísio; José Santiago Pozo Antonio; Teresa Rivas; Alberto Ramil. Mechanical and laser cleaning of spray graffiti paints on a granite subjected to a SO2-rich atmosphere. Construction and Building Materials 2018, 188, 621 -632.
AMA StyleVera Gomes, Amélia Dionísio, José Santiago Pozo Antonio, Teresa Rivas, Alberto Ramil. Mechanical and laser cleaning of spray graffiti paints on a granite subjected to a SO2-rich atmosphere. Construction and Building Materials. 2018; 188 ():621-632.
Chicago/Turabian StyleVera Gomes; Amélia Dionísio; José Santiago Pozo Antonio; Teresa Rivas; Alberto Ramil. 2018. "Mechanical and laser cleaning of spray graffiti paints on a granite subjected to a SO2-rich atmosphere." Construction and Building Materials 188, no. : 621-632.
Laser surface structuring of biometals allows to achieve complex surface geometries at several scales since a rough surface is preferred to induce an optimal cellular response. A lack of standard measurement techniques to characterize implant surfaces was detected. This paper presents a comprehensive, multi-scale characterization of the topography of laser textured biometals with the ISO standard profile method; which allows to separate the contribution of the superimposed textures of the profile, the low frequency component (waviness) and the high frequency component (roughness), and to calculate the respective height parameters according to the standard definitions. Furthermore, the characterization was completed by the calculation of the spatial parameters obtained by FFT calculation in order to assess the horizontal characteristics of the surface. We focused on two common biometals, stainless steel 316L and titanium alloy Ti6Al4V, structured with an array of parallel grooves obtained by using a nanosecond Nd:YVO4 laser. Regarding waviness, some differences in symmetry and sharpness were found according to the metal. Conversely, the roughness of the topography revealed that the average height of the micro-structures developed inside the grooves is similar in both metals. The spatial periodicity of the micro-structures showed that the aspect ratio resulted higher in AISI 316L than in Ti6Al4V. The analytical approach presented in this paper allows to establish an elementary comparison of the results obtained in the scientific community, contributing to a better understanding of in vitro/vivo cellular growing on textured surfaces.
M.P. Fiorucci; A.J. López; A. Ramil. Multi-scale characterization of topographic modifications on metallic biomaterials induced by nanosecond Nd:YVO4 laser structuring. Precision Engineering 2018, 53, 163 -168.
AMA StyleM.P. Fiorucci, A.J. López, A. Ramil. Multi-scale characterization of topographic modifications on metallic biomaterials induced by nanosecond Nd:YVO4 laser structuring. Precision Engineering. 2018; 53 ():163-168.
Chicago/Turabian StyleM.P. Fiorucci; A.J. López; A. Ramil. 2018. "Multi-scale characterization of topographic modifications on metallic biomaterials induced by nanosecond Nd:YVO4 laser structuring." Precision Engineering 53, no. : 163-168.
Alberto Ramil; Ana López; José Santiago Pozo Antonio; T. Rivas. A computer vision system for identification of granite-forming minerals based on RGB data and artificial neural networks. Measurement 2018, 117, 90 -95.
AMA StyleAlberto Ramil, Ana López, José Santiago Pozo Antonio, T. Rivas. A computer vision system for identification of granite-forming minerals based on RGB data and artificial neural networks. Measurement. 2018; 117 ():90-95.
Chicago/Turabian StyleAlberto Ramil; Ana López; José Santiago Pozo Antonio; T. Rivas. 2018. "A computer vision system for identification of granite-forming minerals based on RGB data and artificial neural networks." Measurement 117, no. : 90-95.
Alberto Ramil; José Santiago Pozo Antonio; M.P. Fiorucci; Ana López; T. Rivas. Detection of the optimal laser fluence ranges to clean graffiti on silicates. Construction and Building Materials 2017, 148, 122 -130.
AMA StyleAlberto Ramil, José Santiago Pozo Antonio, M.P. Fiorucci, Ana López, T. Rivas. Detection of the optimal laser fluence ranges to clean graffiti on silicates. Construction and Building Materials. 2017; 148 ():122-130.
Chicago/Turabian StyleAlberto Ramil; José Santiago Pozo Antonio; M.P. Fiorucci; Ana López; T. Rivas. 2017. "Detection of the optimal laser fluence ranges to clean graffiti on silicates." Construction and Building Materials 148, no. : 122-130.
Laser cleaning of stones is a well-established technique in conservation of Cultural Heritage. In case of polymineralic granular rocks like granite, the tuning of the laser parameters for safe cleaning becomes a demanding task due to the differential response of the constituent minerals to laser irradiation. In this sense, a compromise solution must be reached between removing unwanted layers and safeguarding the original characteristics of the stone substrate. Consequently, the need of non-invasive, rapid and accurate methods for in situ identification of the minerals in the stone surface is highlighted. The aim of this paper is to demonstrate the ability of a laboratory scale hyperspectral reflectance imaging system, in combination with artificial neural networks for in situ, accurate identification of constituent minerals of a hercynian granite; with the ultimate goal of achieving automatic adjustment of laser irradiation parameters in cleaning processes. The effectiveness of a neural network with the structure of a three-layer perceptron was evaluated by comparing calculated results with modal analysis composition obtained by petrographic microscope and a high degree of accordance, above 95%, was achieved.
A. J. López; Alberto Ramil; José Santiago Pozo Antonio; M. P. Fiorucci; T. Rivas. Automatic Identification of Rock-Forming Minerals in Granite Using Laboratory Scale Hyperspectral Reflectance Imaging and Artificial Neural Networks. Journal of Nondestructive Evaluation 2017, 36, 52 .
AMA StyleA. J. López, Alberto Ramil, José Santiago Pozo Antonio, M. P. Fiorucci, T. Rivas. Automatic Identification of Rock-Forming Minerals in Granite Using Laboratory Scale Hyperspectral Reflectance Imaging and Artificial Neural Networks. Journal of Nondestructive Evaluation. 2017; 36 (3):52.
Chicago/Turabian StyleA. J. López; Alberto Ramil; José Santiago Pozo Antonio; M. P. Fiorucci; T. Rivas. 2017. "Automatic Identification of Rock-Forming Minerals in Granite Using Laboratory Scale Hyperspectral Reflectance Imaging and Artificial Neural Networks." Journal of Nondestructive Evaluation 36, no. 3: 52.
Most of the Cultural Heritage built in NW Iberian Peninsula is made of granite which exposition to the environment leads to the formation of deposits and coatings, mainly two types: biological colonization and sulphated black crusts. Nowadays, another form of alteration derives from graffiti paints when these are applied as an act of vandalism. A deep revision needs to be addressed considering the severity of these deterioration forms on granite and the different cleaning effectiveness achieved by cleaning procedures used to remove them. The scientific literature about these topics on granite is scarcer than on sedimentary carbonate stones and marbles, but the importance of the granite in NW Iberian Peninsula Cultural Heritage claims this review centred on biological colonization, sulphated black crusts and graffiti on granite and their effectiveness of the common cleaning procedures. Furthermore, this paper carried out a review of the knowledge about those three alteration forms on granite, as well as bringing together all the major studies in the field of the granite cleaning with traditional procedures (chemical and mechanical) and with the recent developed technique based on the laser ablation. Findings concerning the effectiveness evaluation of these cleaning procedures, considering the coating extraction ability and the damage induced on the granite surface, are described. Finally, some futures research lines are pointed out.
J.S. Pozo-Antonio; T. Rivas; A.J. López; M.P. Fiorucci; A. Ramil. Effectiveness of granite cleaning procedures in cultural heritage: A review. Science of The Total Environment 2016, 571, 1017 -1028.
AMA StyleJ.S. Pozo-Antonio, T. Rivas, A.J. López, M.P. Fiorucci, A. Ramil. Effectiveness of granite cleaning procedures in cultural heritage: A review. Science of The Total Environment. 2016; 571 ():1017-1028.
Chicago/Turabian StyleJ.S. Pozo-Antonio; T. Rivas; A.J. López; M.P. Fiorucci; A. Ramil. 2016. "Effectiveness of granite cleaning procedures in cultural heritage: A review." Science of The Total Environment 571, no. : 1017-1028.
The progress of the laser cleaning of two graffiti paints on coarse-grained granite was in situ followed up by the hyperspectral imaging technique, through the calculation of a quantitative index based on a linear spectral mixture analysis model, which provided an estimation of the cleaning level attained along the process. The laser used was a nanosecond pulsed Nd:YVO\(_{4}\) source, at 355 nm wavelength and, in order to validate the results of laser cleaning, conventional analytical techniques as optical microscopy, scanning electron microscopy with energy dispersive X-ray spectrometry, Fourier transform infrared spectroscopy and spectrophotometer colour measurements were also implemented. The results indicated that hyperspectral imaging technique is a reliable tool to in situ control the process of laser cleaning of graffiti in coarse-grained granites in order to determine the laser scans enough to achieve the best possible cleaning without modifying the granitic substrate.
J. S. Pozo-Antonio; M. P. Fiorucci; Alberto Ramil; T. Rivas; Ana López. Hyperspectral Imaging as a Non Destructive Technique to Control the Laser Cleaning of Graffiti on Granite. Journal of Nondestructive Evaluation 2016, 35, 44 .
AMA StyleJ. S. Pozo-Antonio, M. P. Fiorucci, Alberto Ramil, T. Rivas, Ana López. Hyperspectral Imaging as a Non Destructive Technique to Control the Laser Cleaning of Graffiti on Granite. Journal of Nondestructive Evaluation. 2016; 35 (3):44.
Chicago/Turabian StyleJ. S. Pozo-Antonio; M. P. Fiorucci; Alberto Ramil; T. Rivas; Ana López. 2016. "Hyperspectral Imaging as a Non Destructive Technique to Control the Laser Cleaning of Graffiti on Granite." Journal of Nondestructive Evaluation 35, no. 3: 44.
In this work we implemented dynamic speckle and holographic interferometry techniques to characterize the drying process of solvent-based paint coatings. We propose a simple way to estimate drying time by measuring speckle activity and incrementally fitting experimental data through standard regression algorithms. This allowed us to predict drying time after about 20–30 min of paint application, which is fast compared to usual times required to reach the so-called tack-free state (≈2 h). In turn, we used holographic interferometry to map small thickness variations in the coating surface during drying. We also demonstrate that results obtained from both techniques correlate with each other, which allows us to improve the accuracy of the drying time estimation.
N. Budini; C. Mulone; N. Balducci; F. M. Vincitorio; A. J. López; Alberto Ramil. Characterization of drying paint coatings by dynamic speckle and holographic interferometry measurements. Applied Optics 2016, 55, 4706 -4712.
AMA StyleN. Budini, C. Mulone, N. Balducci, F. M. Vincitorio, A. J. López, Alberto Ramil. Characterization of drying paint coatings by dynamic speckle and holographic interferometry measurements. Applied Optics. 2016; 55 (17):4706-4712.
Chicago/Turabian StyleN. Budini; C. Mulone; N. Balducci; F. M. Vincitorio; A. J. López; Alberto Ramil. 2016. "Characterization of drying paint coatings by dynamic speckle and holographic interferometry measurements." Applied Optics 55, no. 17: 4706-4712.
A study of the cleaning effectiveness of sulphated black crust developed on granite is presented. The sulphated black crust, previously characterized, was subjected to a cleaning by 1) a mechanical procedure –Hydrogommage– based on micro-sandblasting, 2) chemical procedures based on the application of poultices made on different mixes of thickening agents and cleaners and 3) laser cleaning using a 355 nm Nd:YVO4 nanosecond laser. Chemical, mineralogical and physical characterization of the cleaned surfaces were performed; the global effectiveness as well as the harmfulness were evaluated according to the level of black crust removal and the substrate damages. As result, none of the methods has been completely effective in removing the sulphated black crust and, also, all the methods produced undesirable effects on the stone. The crust nature, its degree of interaction with the stone and other factors related to the principle of the cleaning procedures were found as the main variables influencing the effectiveness of the cleaning procedures.
J.S. Pozo-Antonio; A. Ramil; T. Rivas; A.J. López; M.P. Fiorucci. Effectiveness of chemical, mechanical and laser cleaning methods of sulphated black crusts developed on granite. Construction and Building Materials 2016, 112, 682 -690.
AMA StyleJ.S. Pozo-Antonio, A. Ramil, T. Rivas, A.J. López, M.P. Fiorucci. Effectiveness of chemical, mechanical and laser cleaning methods of sulphated black crusts developed on granite. Construction and Building Materials. 2016; 112 ():682-690.
Chicago/Turabian StyleJ.S. Pozo-Antonio; A. Ramil; T. Rivas; A.J. López; M.P. Fiorucci. 2016. "Effectiveness of chemical, mechanical and laser cleaning methods of sulphated black crusts developed on granite." Construction and Building Materials 112, no. : 682-690.
The aim of this paper was to evaluate the effectiveness of the laser cleaning of a complex biogenic patina, a crustose lichen, by means of hyperspectral imaging techniques. Samples of a Hercynian granite from NW Spain colonised by an endolithic crustose lichen (Pertusaria amara) were collected and cleaned following three procedures: a scalpel, the third harmonic of a Nd:YVO4 ns laser and the scalpel followed by the laser. The suitability of the hyperspectral camera as a non-destructive, online, fast and in situ monitoring technique to assess the effectiveness of the cleaning was evaluated using optical microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and colour measurements in CIELAB space. The hyperspectral imaging technique allowed us to measure the reflectivity variations of the cleaned surfaces in a non-invasive way, allowing the identification of the cleaning effectiveness of each procedure. Nevertheless, the results of the hyperspectral imaging technique must be validated by conventional techniques.
J. S. Pozo-Antonio; M. P. Fiorucci; T. Rivas; Ana López; Alberto Ramil; D. Barral. Suitability of hyperspectral imaging technique to evaluate the effectiveness of the cleaning of a crustose lichen developed on granite. Applied Physics A 2016, 122, 1 -9.
AMA StyleJ. S. Pozo-Antonio, M. P. Fiorucci, T. Rivas, Ana López, Alberto Ramil, D. Barral. Suitability of hyperspectral imaging technique to evaluate the effectiveness of the cleaning of a crustose lichen developed on granite. Applied Physics A. 2016; 122 (2):1-9.
Chicago/Turabian StyleJ. S. Pozo-Antonio; M. P. Fiorucci; T. Rivas; Ana López; Alberto Ramil; D. Barral. 2016. "Suitability of hyperspectral imaging technique to evaluate the effectiveness of the cleaning of a crustose lichen developed on granite." Applied Physics A 122, no. 2: 1-9.
Nowadays, graffiti paints are one of the most common human interventions on monuments and historic façades with damaging results. It is an aesthetic problem but also a serious threat to the conservation of built heritage. The aim of this article is to evaluate the suitability of a hyperspectral imaging technique as a non-destructive tool to determine the most adequate method of removing graffiti paints applied on granite rocks. Different cleaning procedures were analyzed; i.e., chemical, mechanical, and laser ablation. The cleaning effectiveness was evaluated based on the degree of paint extraction and the final appearance of the stone surface. The results obtained by hyperspectral technique were compared with those obtained by optical and electronic microscopies and color spectrophotometry. These results indicate the ability of hyperspectral imaging technique to assess the paint removal and thus to evaluate the suitability of the different graffiti cleaning procedures. © 2016 Wiley Periodicals, Inc. Col Res Appl, 2016
José Santiago Pozo Antonio; Alberto Ramil; M. P. Fiorucci; Ana López; T. Rivas. The use of hyperspectral imaging technique to detect the most suitable graffiti-cleaning procedure. Color Research & Application 2016, 41, 308 -312.
AMA StyleJosé Santiago Pozo Antonio, Alberto Ramil, M. P. Fiorucci, Ana López, T. Rivas. The use of hyperspectral imaging technique to detect the most suitable graffiti-cleaning procedure. Color Research & Application. 2016; 41 (3):308-312.
Chicago/Turabian StyleJosé Santiago Pozo Antonio; Alberto Ramil; M. P. Fiorucci; Ana López; T. Rivas. 2016. "The use of hyperspectral imaging technique to detect the most suitable graffiti-cleaning procedure." Color Research & Application 41, no. 3: 308-312.
This paper reports the results from the comparative evaluation of the global cleaning effectiveness of four graffiti colours (red, blue, black and silver) applied on two granites with different textures and compositions. A conventional mechanical method and several chemical products were evaluated. Additionally, it was evaluated the cleaning based on laser ablation by means of a nanosecond pulsed Nd:YVO4 at a wavelength of 355 nm. Optical and electronic microscopy, Fourier transformed infrared spectroscopy and spectrophotometry were applied in order to assess the cleaning effectiveness and also the harmful effects on the stones. Taking into account the graffiti extraction degree, it was found that blue, red and black colours were successfully extracted by all the evaluated methods. However, the extraction of silver colour, whose chemical composition differs from that of the other three colours, was more difficult and it was only achieved by the mechanical procedure and by several chemical products; Nd:YVO4 laser at 355 nm was an ineffective procedure in removing this paint. All the cleaning methods produced damage on the granites: a roughness increase after the mechanical cleaning, chemical contamination related to some chemical procedures and melting of biotite crystals after laser cleaning. Moreover, the ability of different paints to penetrate into the rock affected the global cleaning effectiveness evaluation.
José Santiago Pozo Antonio; T. Rivas; M.P. Fiorucci; Ana López; Alberto Ramil. Effectiveness and harmfulness evaluation of graffiti cleaning by mechanical, chemical and laser procedures on granite. Microchemical Journal 2015, 125, 1 -9.
AMA StyleJosé Santiago Pozo Antonio, T. Rivas, M.P. Fiorucci, Ana López, Alberto Ramil. Effectiveness and harmfulness evaluation of graffiti cleaning by mechanical, chemical and laser procedures on granite. Microchemical Journal. 2015; 125 ():1-9.
Chicago/Turabian StyleJosé Santiago Pozo Antonio; T. Rivas; M.P. Fiorucci; Ana López; Alberto Ramil. 2015. "Effectiveness and harmfulness evaluation of graffiti cleaning by mechanical, chemical and laser procedures on granite." Microchemical Journal 125, no. : 1-9.
F. M. Vincitorio; C. Mulone; P. A. Marcuzzi; Nicolás Budini; C. Freyre; Ana López; Alberto Ramil. Dynamic speckle study of microbial growth. SPECKLE 2015: VI International Conference on Speckle Metrology 2015, 96601Q -96601Q-6.
AMA StyleF. M. Vincitorio, C. Mulone, P. A. Marcuzzi, Nicolás Budini, C. Freyre, Ana López, Alberto Ramil. Dynamic speckle study of microbial growth. SPECKLE 2015: VI International Conference on Speckle Metrology. 2015; ():96601Q-96601Q-6.
Chicago/Turabian StyleF. M. Vincitorio; C. Mulone; P. A. Marcuzzi; Nicolás Budini; C. Freyre; Ana López; Alberto Ramil. 2015. "Dynamic speckle study of microbial growth." SPECKLE 2015: VI International Conference on Speckle Metrology , no. : 96601Q-96601Q-6.
J.S. Pozo-Antonio; M.P. Fiorucci; A. Ramil; A.J. López; T. Rivas. Evaluation of the effectiveness of laser crust removal on granites by means of hyperspectral imaging techniques. Applied Surface Science 2015, 347, 832 -838.
AMA StyleJ.S. Pozo-Antonio, M.P. Fiorucci, A. Ramil, A.J. López, T. Rivas. Evaluation of the effectiveness of laser crust removal on granites by means of hyperspectral imaging techniques. Applied Surface Science. 2015; 347 ():832-838.
Chicago/Turabian StyleJ.S. Pozo-Antonio; M.P. Fiorucci; A. Ramil; A.J. López; T. Rivas. 2015. "Evaluation of the effectiveness of laser crust removal on granites by means of hyperspectral imaging techniques." Applied Surface Science 347, no. : 832-838.
M P Fiorucci; A J Lopez; Alberto Ramil. Surface modification of Ti6Al4V by nanosecond laser ablation for biomedical applications. Journal of Physics: Conference Series 2015, 605, 1 .
AMA StyleM P Fiorucci, A J Lopez, Alberto Ramil. Surface modification of Ti6Al4V by nanosecond laser ablation for biomedical applications. Journal of Physics: Conference Series. 2015; 605 ():1.
Chicago/Turabian StyleM P Fiorucci; A J Lopez; Alberto Ramil. 2015. "Surface modification of Ti6Al4V by nanosecond laser ablation for biomedical applications." Journal of Physics: Conference Series 605, no. : 1.
Laser surface texturing is a promising tool for improving metallic biomaterials performance in dental and orthopedic bone-replacing applications. Laser ablation modifies the topography of bulk material and might alter surface properties that govern the interactions with the surrounding tissue. This paper presents a preliminary evaluation of surface modifications in two biometals, stainless steel 316L and titanium alloy Ti6Al4V by UV nanosecond Nd:YVO4. Scanning electron microscopy of the surface textured by parallel micro-grooves reveals a thin layer of remelted material along the grooves topography. Furthermore, X-ray diffraction allowed us to appreciate a grain refinement of original crystal structure and consequently induced residual strain. Changes in the surface chemistry were determined by means of X-ray photoelectron spectroscopy; in this sense, generalized surface oxidation was observed and characterization of the oxides and other compounds such hydroxyl groups was reported. In case of titanium alloy, oxide layer mainly composed by TiO2 which is a highly biocompatible compound was identified. Furthermore, laser treatment produces an increase in oxide thickness that could improve the corrosion behavior of the metal. Otherwise, laser treatment led to the formation of secondary phases which might be detrimental to physical and biocompatibility properties of the material.
M. Paula Fiorucci; Ana J. López; Alberto Ramil. Surface modification induced by UV nanosecond Nd:YVO4laser structuring on biometals. Second International Conference on Applications of Optics and Photonics 2014, 9286, 92862F .
AMA StyleM. Paula Fiorucci, Ana J. López, Alberto Ramil. Surface modification induced by UV nanosecond Nd:YVO4laser structuring on biometals. Second International Conference on Applications of Optics and Photonics. 2014; 9286 ():92862F.
Chicago/Turabian StyleM. Paula Fiorucci; Ana J. López; Alberto Ramil. 2014. "Surface modification induced by UV nanosecond Nd:YVO4laser structuring on biometals." Second International Conference on Applications of Optics and Photonics 9286, no. : 92862F.
In this work it is presented a study about the ability of multispectral techniques for evaluating in situ, nondestructively, the progress of laser removal of crusts and paints in granitic rocks. For this purpose, granites with different characteristics were cleaned by the third harmonic of a Nd:YVO4 laser, and a multispectral camera was used to monitor the process by recording images of the rock surface during the cleaning. Although preliminary, the results are promising and show that the comparative analysis of the spectra could be used for successfully monitoring the cleaning process. Furthermore, it has been possible to discriminate between black crusts of different nature, biogenic and anthropogenic, by analyzing specific spectral bands.
M. P. Fiorucci; Ana López; Alberto Ramil; Susana Del Pozo; T. Rivas. Monitoring the laser cleaning of granites by means of multispectral image analysis. Second International Conference on Applications of Optics and Photonics 2014, 9286, 928610 .
AMA StyleM. P. Fiorucci, Ana López, Alberto Ramil, Susana Del Pozo, T. Rivas. Monitoring the laser cleaning of granites by means of multispectral image analysis. Second International Conference on Applications of Optics and Photonics. 2014; 9286 ():928610.
Chicago/Turabian StyleM. P. Fiorucci; Ana López; Alberto Ramil; Susana Del Pozo; T. Rivas. 2014. "Monitoring the laser cleaning of granites by means of multispectral image analysis." Second International Conference on Applications of Optics and Photonics 9286, no. : 928610.
The aim of this paper is to analyze the influence of the working parameters in the micromachining process of stainless steel 316L and Ti6Al4V by means of a 355nm Nd:YVO4 nanosecond laser. Our target is the surface texturing of biometallic implants to favor osseointegration. With this purpose, well-organized structures, a matrix of pits, and a pattern of grooves were created under different laser parameters and irradiation schemes on metallic surface. Processed metal surfaces were characterized by confocal microscopy and scanning electron microscopy to establish the most adequate processing parameters to generate textured sizes in a range suitable for biomedical applications.
M. P. Fiorucci; A. J. López; Alberto Ramil. Comparative study of surface structuring of biometals by UV nanosecond Nd:YVO4 laser. The International Journal of Advanced Manufacturing Technology 2014, 75, 515 -521.
AMA StyleM. P. Fiorucci, A. J. López, Alberto Ramil. Comparative study of surface structuring of biometals by UV nanosecond Nd:YVO4 laser. The International Journal of Advanced Manufacturing Technology. 2014; 75 (1-4):515-521.
Chicago/Turabian StyleM. P. Fiorucci; A. J. López; Alberto Ramil. 2014. "Comparative study of surface structuring of biometals by UV nanosecond Nd:YVO4 laser." The International Journal of Advanced Manufacturing Technology 75, no. 1-4: 515-521.