Quantum Monte Carlo techniques for planetary geophysics and heterogeneous catalysis

Lead Research Organisation: University College London
Department Name: Earth Sciences

Abstract

The main aim of the project is to provide major advances in applied quantum mechanics calculations on condensed matter. The new paradigm will be based on quantum Monte Carlo techniques. Two major applications will be presented: the evaluation with great precision of the temperature of the Earth's core and the search for the best catalyst for the extraction of hydrogen from methane and water. The former has important implications for our knowledge of the thermal structure of the Earth interior, and with it our understanding of all the dynamical processes inside our planet, including, volcanism, plate tectonics, earthquakes, and the geodynamo, which is responsible for the generation of the Earth's magnetic field which protects us from the deadly solar wind. The research of the best catalyst for the extraction of hydrogen is in the context of a world wide effort to tackle the energetic problem and the related issue of human produced carbon dioxide, with the consequent problem of global warming. The research will have impact on the world's economy and eventually on the quality of the Earth's atmosphere. Both projects will be carried out by developing high precision quantum mechanics techniques. Specifically, we will develop and apply quantum Monte Carlo simulations to the calculation of the thermodynamical properties of iron under Earth's core conditions and to the calculation of energy barriers and transition states of methane and water on various catalytic surfaces. Beside the development and the application of novel techniques, both applications have in common a deep interest for understanding the dynamics of our planet. either naturally or man driven.
 
Description The main aim of the project was to provide major advances in applied quantum mechanics calculations on condensed matter. The new paradigm has been based on quantum Monte Carlo techniques. Two main outcomes have been obtained: the evaluation with great precision of the temperature of the Earth's core and the search for new materials with good hydrogen storage properties. The former has important implications for our knowledge of the thermal structure of the Earth interior, and with it our understanding of all the dynamical processes inside our planet, including, volcanism, plate tectonics, earthquakes, and the geodynamo, which is responsible for the generation of the Earth's magnetic field which protects us from the deadly solar wind. The research on hydrogen storage is in the context of a world wide effort to tackle the energetic problem and the related issue of human produced carbon dioxide,with the consequent problem of global warming. The research may have impact on the world's economy and eventually on the quality of the Earth's atmosphere. Both projects have been carried out by developing high precision quantum mechanics techniques. Specifically, we developed and applied quantum Monte Carlo simulations to the calculation of the thermodynamical properties of iron under Earth's core conditions and to the calculations of enthalpies of formation and energy barriers for several hydrogen storage materials.

On the first topic, we now have an accurate estimate of the Earth's core temperature. On the second topic we provided data for the energy barrier to dissociation of hydrogen on a number of hydrogen storage materials surfaces, and showed the effect of doping these materials with several transition metal atoms that work as catalysts.
Exploitation Route The hydrogen storage results could be used to design new hydrogen storage materials The hydrogen storage results could be used to design new hydrogen storage materials
Sectors Energy,Environment

 
Description New estimates of the temperature and composition of the Earth's core have allowed more precise modelling of the interior of our planet
First Year Of Impact 2007
Sector Education,Environment,Other
Impact Types Cultural

 
Title PHON - A program to calculate phonons using the small displacement method 
Description I am not entirely sure if this is relevant, but here it is. The PHON code is a computer software that is used to compute vibrational frequencies of materials, and with them also compute their thermodynamic properties. The programme is freely available from my personal web-page, and also from Github and from the Computer Physics Communications website. 
Type Of Material Improvements to research infrastructure 
Year Produced 2009 
Provided To Others? Yes  
Impact PHON is used by hundreds of groups worldwide, and the describing paper (Computer Physics Communication 180, 2622-2633 (2009)) has been already cited more than 400 times. I am associating this product with all my grants as I have been developing this code over the years, and so all my grants have contributed to sustain this development. 
URL http://www.homepages.ucl.ac.uk/~ucfbdxa/phon/