Kemp, Thomas F. (2008) Solid state NMR studies of inorganic pigment materials and catalysts. PhD thesis, University of Warwick.

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Abstract

The research conducted can be split into three major regions; pigment
material, a simulation program called QuadFit and mesoporous oxides. There
has also been some extra work conducted on a catalyst for partial hydrogenation
of vegetable oils. Various techniques have been used on the different systems
including XPS, STEM and 77Se, 17O, 93Nb, 15N, 119Sn, 27Al, 115In and 63,65Cu
static and MAS NMR.
The pigment materials consist of a series of materials which are grouped
under the F-Colours project. The pigments consist of sulphur doped tin niobates,
copper indium sulphur selenide doped zinc selenides, sulphur doped tin tungstates
and colloidal gold and silver enamels. The sulphur doped tin niobate study shows
a conversion from foordite to pyrochlore and also where the sulphur sits in the
structure. The copper indium sulphur selenide doped zinc selenide study shows the
indium and copper moving into the zinc selenide as copper indium pairs. However,
how the pairs sit in the structure remains undetermined. The sulphur doped tin
tungstate study shows that the sulphur acts as a promoter for the beta phase
rather than the desired alpha phase. The enamels based on gold and silver show
that the tin site does not determine the colour of the enamel and the silver-gold
association is likely to be the dominant factor.
Mesoporous oxides show a link between the amount of mesoporous structure
and their temperature stability. The nitrogen spectra of the template in the
material shows that in the mesoporous silicate (which has the largest surface area)
there is a breakdown of the amine into NH groups which does not appear in the
other mesoporous materials. This could lead to a method of increasing the surface
area of the other mesoporous oxides.
QuadFit has the ability to simulate quadrupolar and CSA interactions with
distributions of interactions whilst static and the quadrupolar interaction with
distributions under MAS. The program is written in Java so will run on most
platforms and also has near perfect stability.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	Q Science > QC Physics T Technology > TP Chemical technology
Library of Congress Subject Headings (LCSH):	Nuclear magnetic resonance spectroscopy, Pigments, Catalysts
Official Date:	2008
Dates:	Date Event 2008 Submitted
Institution:	University of Warwick
Theses Department:	Department of Physics
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Smith, Mark E.
Sponsors:	Engineering and Physical Sciences Research Council (EPSRC); Mattley, Johnson
Extent:	xxii, 179 leaves.
Language:	eng

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