Natalia Cristina de Mendonça Spera

International Iberian Nanotechnology Laboratory · Nanochemistry

Cost-effective, active, and durable electrodes are required for the development of the efficient alkaline water electrolysis towards green hydrogen production. Here, we report successful fabrication of such electrodes by means of robust radio frequency magnetron sputtering that produces uniform, crystalline, and phase pure catalytic iridium thin fi...

Protective coatings are used as a corrosion mitigation strategy in many industries. However, damages on transport, installation, and during the service life can expose the metal, leading to failures. Self-healing materials can address this issue by recovering their properties and functionality post-damage. Herein, it was developed an extrinsic self...

Proton Exchange Membrane (PEM) water electrolysis (WE) produces H2 with a high degree of purity, requiring only water and energy. If the energy is provided from renewable energy sources, it releases “Green H2”, a CO2-free H2. PEMWE uses expensive and rare noble metal catalysts, which hinder their use at a large industrial scale. In this work, the e...

The in situ formation of mullite (Al6Si4O13) is a complex process based on solid‐state reactions strongly affected by the characteristics of Al2O3 and SiO2 sources. This study investigated the combined effects of variable SiO2/Al2O3 ratios and the presence of low‐melting‐point impurities on the physical properties and microstructure of in situ alum...

Colloidal silica (CS) is a promising raw material for refractory castable ceramics. It consists of stable suspensions of synthetic amorphous silica nanoparticles that behave simultaneously as liquid medium and binder for ceramic particles and as a porogenic agent and highly reactive source of silica to promote in-situ reactions. The setting mechani...

There is a clear need for learning other languages when it comes to aeronautics, since most of the manufacturers and companies that provide services such as maintenance, development of projects and airlines are present worldwide. For restoration, aeronautical mechanics use aircraft’s manuals to perform their daily tasks, which are mostly in English...

Improvements in energy efficiency motivate the development of more effective and durable thermal insulation. Porous ceramics based on mullite (Al6Si2O13 or 3Al2O3.2SiO2) have great potential for this application due its high resistance to corrosion and densification. Although rare in its mineral form, this is one of the most important phases in tra...

Mullite (3Al 2 O 3 ·2SiO 2) has good thermal mechanical properties and is commonly applied as refractory ceramics. Using colloidal silica, may improve particles reactivity, sinterability and mullite formation, for the in situ reaction with calcined alumina (-Al 2 O 3). This study evaluated castable suspensions of pre-calcined aluminum hydroxide (A...

O presente artigo apresenta uma perspectiva da trajetória do O conhecimento do inglês, na aeronáutica, é fundamental, pois a comunicação global entre suas áreas é feita por meio dessa língua. Na tentativa de correção de falhas na interlocução, a Organização Internacional da Aviação Civil (ICAO, em inglês) definiu, em 2008, obrigatória a proficiênci...

Researches involving self-healing materials have gain importance due to their capability of longer life cycles of products. The present study investigates one ionomer and its ability to heal with thermal stimulus after low energy damages, such as scratch detriments. The polymer films were adhered to a metallic substrate by hot-pressing and damaged...

In aviation, the maintenance has a fundamental key role in ensuring the safety of passengers, crew and everyone directly involved with the aircraft. Over time, companies specialized in these activities appeared, now known as MRO Centers that stands for Maintenance, Repair and Overhaul. To control the activities carried out by these centers, each co...

Self-healing ionomer has proven the ability to autonomous heal after a damage event in room temperature. The present study intent to investigate the self-healing response of microcracks in an ionomer polymer partially neutralized upon bullet penetration in cryogenic conditions. The specimens were obtained by hot press of pellets and after ballistic...

Knowing English is essential in aviation field mainly because the communication among people who work in this area is done through this language. In attempt to reduce miscommunication, the international Civil Aviation Organization (ICAO) determined as mandatory the proficiency for these professionals tested through global tests for language harmoni...

https://drive.ifsp.edu.br/s/xowx9jotiW2LxsW