A5046011927- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Surface Modification and Superhydrophobicity
- Metal and Thin Film Mechanics
- Fluid Dynamics and Thin Films
- Surface Roughness and Optical Measurements
- Adhesion, Friction, and Surface Interactions
- Optical Coatings and Gratings
- Surfactants and Colloidal Systems
- Characterization and Applications of Magnetic Nanoparticles
- Advanced materials and composites
- Rheology and Fluid Dynamics Studies
- Advanced machining processes and optimization
- Advanced Fiber Optic Sensors
- Heat Transfer and Boiling Studies
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- TiO2 Photocatalysis and Solar Cells
- Tribology and Wear Analysis
- Lubricants and Their Additives
- Silicone and Siloxane Chemistry
- Anodic Oxide Films and Nanostructures
- Microplastics and Plastic Pollution
- Corrosion Behavior and Inhibition
- Academic Research in Diverse Fields
Universidade de Caxias do Sul
2015-2025
Departamento de Ciência e Tecnologia
2021
Materia (United States)
2021
Universidade Federal do Rio Grande do Sul
2006-2019
Instituto de Física La Plata
2006-2018
Ostwestfalen-Lippe University of Applied Sciences and Arts
1995-1996
Superhydrophobic and self-cleaning surfaces may arise due to interplay between nano/microstructures at the solid surface chemical properties of topmost monolayer. In present work, those relationships were investigated by Al substrate modifications via functionalization with trimethoxypropylsilane dipping, coating a thin perfluorinated layer. The effect nano/micromorphology on superhydrophobicity hysteresis was studied using two main approaches: (i) etching substrates (ii) anodic aluminum...
Textures that resemble typical fern or bracken plant species (dendrite structures) were fabricated for liquid repellency by dipping copper substrates in a single-step process solutions containing AgNO3 simple spray application. Superhydrophobic surfaces produced using solution and trimethoxypropylsilane (TMPSi), superomniphobic two-step procedure, immersing the substrate and, after that, 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES). The functionalization processes can also be used when...
Bacteria are an old concern to human health, as they responsible for nosocomial infections, and the number of antibiotic-resistant microorganisms keeps growing. Copper is known its intrinsic biocidal properties, therefore, it a promising material combat infections when added surfaces. However, properties in presence light illumination have not been fully explored, especially regarding use microsized particles since nanoparticles taken over all fields research subjugated microparticles...
Laminated metallic composites (LMCs) produced by cold roll bonding generate high plastic deformation. After the rolling process, it is essential to promote a post-heat treatment (PHT) increase adhesion, minimize hardening, and enhance formability of LMCs. In this research, effects PHT at low temperatures (250, 350, 450°C) on LMCs (STS304/Al1050/STS430) obtained were investigated. The Forming Limit Curve (FLC) mechanical properties such as ultimate tensile strength (σ_UT), yield (σ_Y),...
Superhydrophobic self-cleaning surfaces were produced with simultaneous wide-angle optical transmittance in the near-infrared region and antireflection properties from combination of multi-scale surface topology based on silica nanoparticles, index grading interference.
Hydrogenated amorphous carbon thin films (a-C:H) have attracted much attention because of their surprising properties, including ultralow friction coefficients in specific conditions. Adhesion a-C:H on ferrous alloys is poor due to chemical and physical aspects, avoiding a widespread application such film. One possibility overcome this drawback depositing an interlayer—an intermediate film—between the carbon-based coating substrate improve interaction adhesion. Based this, interlayers play...
Micro- and nanostructures of Ti-γCu (γ = 0, 30, 50, 70, 100 wt %) intermetallic alloys were produced through a single anodization step. It was found that the original alloy composition influences final oxide morphology obtained after which presented formation microstructure with nanotubes, nanoparticles or nanopillars on surface. Pure Ti Cu metals their hydrophilic superhydrophilic properties immediately anodization. When anodized pure metal and/or surfaces functionalized...
Hydrogenated amorphous carbon (a-C:H) is a type of coating vastly applied on steel alloys due to its low friction coefficient, high hardness, and chemical inertness. Also, characteristic brilliant black color like onyx stone desirable for decorative applications. Despite the beneficial properties conferred ferrous substrates, adhesion a-C:H films weakened by residual stress. In order improve films/steel alloy structures, one adopted strategy addition an interlayer. This research investigated...
In this work self-cleaning and transparent surfaces were produced on glass surface with simultaneous wide-angle good optical transmittance the visible region. These properties are pursued by combination of multi-scale topology based silica nanoparticles (SNPs), index grading interference coating, as well polytetrafluoroethylene (PTFE) self-assembly, using two approaches. first, two-layer approach (glass/SNPs/PTFE), resulting samples presented a water contact angle (WCA) 169° ± 2° very low...
The poor adhesion of carbon thin films was the main restriction for its massive application in recent years. Physicochemical interaction improvement at interface between substrate and film is one most important fields research to overcome such problem. From a chemical point view, oxygen seems be major issue control. In this work, influence base pressure prior deposition process on tribological behaviour studied. Rockwell C scratch tests were performed qualify failures adhesion. Chemical...
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...
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.
The novel coronavirus designated as SARS-CoV-2 has risen the first pandemic caused by and November 26, 2020 is responsible for more than 1,410 million deaths. This scenario evidences that despite previous pandemics epidemics in world’s history, current worldwide measures to contain mitigate viruses’ outbreaks are still disabled insufficient. Therefore, this perspective reinforces need new practical approaches antiviral material developments presents technologies its advances field of...
The wet ability of micro and nanocrystalline diamond films (MCD NCD) coated with PTFE was investigated. were grown by microwave plasma CVD without nitrogen addition. Both surfaces the evaluated atomic force microscopy (AFM) scanning electron (SEM). Apparent, advancing receding water contact angles (WCA) measured before after coating. roughness microcrystalline together nanostructured coating resulted in super hydrophobic angle 165° ± 2° very low hysteresis (4°). For films, also high (149°...
Silicon-based materials are widely applied in micro- and nanoscale devices, such as nano-electromechanical systems (MEMs NEMs, respectively). However, the nanofriction behavior of is still an issue that influences or hinders some applications. Recently, a sliding-dependent friction mechanism was accessed, by simulation hydrogenated silicon surfaces, which forces increase during sliding. The experimental evaluation this phenomenon lacking, well confirmation ambient air conditions, related to...