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CO2 adsorption on ZnO nanoparticles and the relationship with surface enthalpy and size stability

Grant number: 11/02080-6
Support type:Scholarships abroad - Research
Effective date (Start): August 01, 2011
Effective date (End): July 28, 2012
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Douglas Gouvêa
Grantee:Douglas Gouvêa
Host: Alexandra Navrotsky
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Local de pesquisa : University of California, Davis (UC Davis), United States  


Understanding the growth of particles during nanosíntese is being done through dissemination of concepts based on species composition of the materials. It is indisputable that the diffusion is an important part of the phenomena of growth, but certainly not the only one. The understanding of the different contributions is one of the master keys to obtain stable nanomaterials. The role of surfaces and interfaces in the growth process of particles and grains have been poorly exploited due to the great difficulty of chemical analysis and also on the determination of its energy. The measurement of surface energy of nanoparticles and nanograins is only possible so far by direct measurements of the heat of dissolution. Currently there is only one type of calorimeter in the world able to perform measurements of heat of dissolution and costs more than a million dollars. However, the simple measure of the heat of dissolution is not sufficient to accurately determine the surface energy of a nano powder. Several factors may have a direct influence on correct determination of surface energy, and among them can be emphasized: the formation of grain boundaries or necks between particles, the segregation of additives or impurities on surfaces and interfaces and adsorption of gases in surfaces. The main justification of this project is the opportunity to meet and have contact with a new characterization technique that allows to obtain the surface energy of nanopowders using the technique of calorimetry of dissolution that is unique in the world and therefore absent from the Brazil, and within a group of international recognition. The ultimate intention is to have a similar system in Brazil. For this, we intend to obtain nanomaterials through chemical synthesis and their complete characterization and, later, to determine the surface energy and their relationship with the stability of nanoparticles and nanogrãos regarding the synthesis atmosphere, mainly CO2. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GOUVEA, DOUGLAS; USHAKOV, SERGEY V.; NAVROTSKY, ALEXANDRA. Energetics of CO2 and H2O Adsorption on Zinc Oxide. Langmuir, v. 30, n. 30, p. 9091-9097, AUG 5 2014. Web of Science Citations: 25.
WU, DI; GASSENSMITH, JEREMIAH J.; GOUVEA, DOUGLAS; USHAKOV, SERGEY; STODDART, J. FRASER; NAVROTSKY, ALEXANDRA. Direct Calorimetric Measurement of Enthalpy of Adsorption of Carbon Dioxide on CD-MOF-2, a Green Metal-Organic Framework. Journal of the American Chemical Society, v. 135, n. 18, p. 6790-6793, MAY 8 2013. Web of Science Citations: 79.

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