A5031377685- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Ion-surface interactions and analysis
- Adhesion, Friction, and Surface Interactions
- TiO2 Photocatalysis and Solar Cells
- Molecular Junctions and Nanostructures
- Bone Tissue Engineering Materials
- Advanced materials and composites
- Electronic and Structural Properties of Oxides
- Surface Treatment and Residual Stress
- Mechanical and Optical Resonators
- High Entropy Alloys Studies
- nanoparticles nucleation surface interactions
- Electrical Contact Performance and Analysis
- BIM and Construction Integration
- Tribology and Wear Analysis
- Metallurgical Processes and Thermodynamics
- Power Transformer Diagnostics and Insulation
- Luminescence Properties of Advanced Materials
- Transition Metal Oxide Nanomaterials
- Electron and X-Ray Spectroscopy Techniques
- 2D Materials and Applications
- Advanced ceramic materials synthesis
Universidade Estadual de Campinas (UNICAMP)
2019-2025
Centro de Tecnologia da Informação Renato Archer
2023
Universidade de Caxias do Sul
2010-2021
Optical properties of hydrogenated TiO2 thin films deposited by the ion beam sputtering method are reported. By reducing oxide hydrogenation in situ (during deposition) and ex (by means posterior thermal annealing) a controlled phase modification allows to manipulate optical improve photoactivity for solar energy conversion catalytic applications. The procedure prompts remarkable structural changes hierarchical films. Photoemission electron spectroscopy (XPS) results show presence titanium...
In dry sliding, the coefficient of friction depends on material pair and contact conditions. If operating conditions remain unchanged, is constant. Obviously, we can tune by surface treatments, but it a nonreversible process. Here, report active control forces TiO2 thin films under UV light. It reversible stable be tuned/controlled with light wavelength. The analysis atomic force microscopy signals wavelet spectrograms reveals different mechanisms acting in darkness UV. Ab initio simulations...
The mechanisms of plasma post-oxidation nitrided AISI 1045 plain steel were investigated. influence temperature and time on the oxide layer thickness, morphology, composition addressed. thickness grows exponentially with temperature, activation energy 68 ± 5 kJ mol − 1. dependence other hand, is governed by a diffusion-reaction process. It was verified that plays an important role morphology oxide. Indeed, at highest 550 °C, not homogeneous has lower hardness than layers obtained 480 to 500...
Energy dissipation associated with frictional damping mechanisms owing to van der Waals (vdW) forces by induced polarizability at the sliding interface of a-C:H thin films.
Owing to its singular and (to some extend) adaptable characteristics, titanium oxynitride (TixOyNz) represents an exceptional choice in the realm of new materials aiming at development practical devices. However, effective use TixOyNz photovoltaic (photo)catalysis applications, for example, relies on a refined production−properties balance. Accordingly, this paper reports physico-chemical properties films as investigated by means Raman scattering X-ray photoelectron spectroscopy (XPS)...
Abstract In this paper, topographically asymmetric TiO x /TiSi metastable ultrathin (nano)films on SiO 2 /Si(100) are produced by controlling interface reactions through ion beam synthesis. The film growth process involves a dual system, combining Ar + sputtering Ti target and in situ postirradiation (Ar H etching) at normal incidence to modify the surface morphology. film's production characterization challenging due formation of complex mixed layers (heterophases) containing...
Lateral force microscopy (LFM) is an established technique to assess friction forces at the nanoscale. Nanoindentation followed by unidirectional sliding (NUS) also used evaluate micro/nanoscale. However, comparative studies between NUS and LFM evaluating experimental results different scales are still missing. In this work, a-C:D/H a-C:H thin films with [D]/[C] [H]/[C] contents were analyze LFM. The show that behavior assessed these two techniques in same. correlation measured depends...
The influence of surface microstructure and chemical composition on the corrosion behavior AISI 1045 (UNS G10450) plain steel modified by plasma-assisted diffusion nitrogen oxygen was investigated. A detailed characterization performed before after cyclic potentiodynamic polarization salt spray tests, using scanning electron microscopy at low high resolutions, energy-dispersive x-ray spectroscopy, diffraction, glow discharge optical emission spectroscopy. resistance as determined found to...
In modern medicine, biomaterials have been widely used as implants. Among biomaterials, titanium medical class is distinguished by its high degree of biocompatibility. However, orthoses and prostheses infected with post-implanted microorganisms require surgeries interventions that are costly treatment can take months. To combat infections associated implants, the best strategy to prevent them from occurring. One silver ion implantation in titanium. this work, ions were implanted at low...
The urgent need to address the global sustainability issues that modern society is currently facing requires development of micro and nanotechnologies, which rely largely on functional materials. Beyond studies focused solely low-dimensional materials, broader research related multifunctionality has shown major efforts meet these criteria for new electronic, photonic, optoelectronic concepts, particularly achieve high-performance devices, are still challenging. By exploiting their unique...