A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. As the catalyst itself takes part in the reaction it may undergo a physical change. Hence, if catalysts take the form of nanoparticles, any physical feature of the nanoparticle interacting with the reacting molecules may […]
Some heteropolymers can be designed to spontaneously self-assemble in complex pre-determined knotted structures. In the past, we referred to such designable heteropolymers as “bionic proteins”. Here we present an extensive study on self-knotting bionic proteins. As our everyday experience with ropes teaches us, knots form spontaneously in polymer chains of sufficient length and flexibility have […]
A tax on carbon emissions is an efficient way to make firms and consumers internalize the environmental costs due to climate change. However, there are many other aspects to consider in a transition from a fossil-fueled economy to a cleaner one. In a past article we presented the case for subsidies on research to develop […]
Chemistry • Condensed matter • Materials • Nanotechnology • Quantum physics
A quantum dot is a nanometric crystalline structure of semiconductor materials. In a quatum dot electrons are confined in a region of space, thus creating a well defined structure of energy levels that depends very much on the size and shape of the quantum dot. This structure resembles that of atoms, that is why sometimes […]
In the transition from a petrol-based society to a one based on bio-renewable resources, the replacement of aromatic chemicals is one of the most challenging issues. Nowadays, around 40% of the bulk chemicals belong to the aromatic category, and a myriad of products are derived from benzene, toluene and xylene. Aromatic molecules are present in […]
Condensed matter • Materials • Nanotechnology • Quantum physics
Imagine a military regiment in formation. That we will call symmetry. Now imagine the same regiment when it is dismissed by the commanding officer: at once the soldiers disperse and tend to form domains (groups) or pairs. Hence, we can say that the symmetry is spontaneously broken. Both superconductors and ferromagnets are examples of electron […]
Several researchers in the field of artificial intelligence (AI) are warning about an AI winter, which means that scientists might lose the interest on the discipline, institutions reduce drastically the funding towards its research and lose presence in the public debate. It wouldn’t be the first AI winter though. The last two decades have been […]
When nanoparticles (NPs) get in contact with biological fluids such as blood, proteins present in it will adsorb on the surface of those NPs forming what is known as the protein corona . It is a dynamic process in equilibrium with the surrounding proteins and it may lead to drastic changes in the NPs. The […]
Floating structures are becoming increasingly popular. They are used by several industries, some have been in business for decades, like those dedicated to oil and gas, some are newer, like renewables (wind, wave, tidal), and there are still some other uses, like ports, while there is a constant flow of new ideas that imply their […]
Condensed matter • Materials • Nanotechnology • Quantum physics
Few materials have drawn as much attention as graphene, it fascinating attributes such as one-atom thickness and relativistic electrons, and its technological properties like transparency, large mechanical strength, and ultra-high electron’s mobility, position it as one of the more promising materials in the present. Recently, simultaneous experimental and theoretical studies have confirmed that combining graphene […]