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Determining the Effect of Local Structure of Acidity in High Surface Area Oxides

Determining the Effect of Local Structure of Acidity in High Surface Area Oxides Luis Smith, Clark University.

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Determining the Effect of Local Structure of Acidity in High Surface Area Oxides

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  1. Determining the Effect of Local Structure of Acidity in High Surface Area Oxides Luis Smith, Clark University Local variations in the structure of layered niobates affects the surface properties of the material. In this particular study our focus is on the surface acid sites present in the nanosheet versions of these materials that are produced upon exfoliation. 93Nb solid-state NMR has been used to measure both the electric field gradient (EFG) and the chemical shift anisotropy (CSA) at the niobium sites as both effects are sensitive to the local bonding of the niobium. Layered HCa2Nb3O10 Exfoliated (TBA,H)Ca2Nb3O10 Exfoliation of layered niobates results in changes from a single ordered surface site to two different environments in which one is more symmetric and another less symmetric in terms of local geometry.

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