Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 6 of 6 for “"allophane"”.
-
The colloid and surface chemistry of allophane
… of New Zealand is the amorphous aluminosilicate allophane. Although it can be obtained cheaply, allophane is the only common clay mineral not yet exploited commercially. This may be because large deposits of it only occur in a few areas of small extent on recent andesitic and rhyolitic parent …
-
Multivariate Analysis of Factors Regulating the Formation of Synthetic Allophane and Imogolite Nanoparticles
Imogolite and allophane are nanosized aluminosilicates with high value in industrial and technological applications, however it remains unclear what factors control their formation and abundance in nature and in the lab. This work investigated the complex system of physical and chemical conditions …
-
An assessment of morphological, physical, chemical, and mineralogical properties of soils derived from volcanic deposits in Rwanda
… to sodium pyrophosphate extractable aluminum and allophane contents. Soil cation exchange capacity, organic C, water retention properties, and aluminum and iron associated with organic matter and allophane decrease whereas, pH and bulk density increase with elevation. Allophane content decreases …
-
The use of physical and chemical techniques in the identification of Tephera (volcanic ash) in the North Island, New Zealand
… kinetics model for the weathering of glass to allophane to provide approximate dates for the samples. While the object of this thesis was to review and develop physical, chemical, and mineralogical techniques of use in tephrostratigraphy, the techniques were used to solve some specific …
-
Development of techniques for the assessment of denitrification in New Zealand soils
… and nitrification activity. Soils containing allophane generally exhibited high denitrification activities. The denitrification potential also varied with stock rates, higher denitrification potentials being observed under high stocking rates on a given soil. This effect was attributed to the …