Thesis (M.S.)--University of Missouri, School of Mines and Metallurgy, 1947. / Vita. The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed June 16, 2010) Includes bibliographical references (p. 51).

Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references (leaves 57-64). Also available in electronic version.

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2006. / Includes bibliographical references (leaves 122-127). Also available in electronic version.

Thesis (Ph. D.)--Drexel University, 2007. / Includes abstract and vita. Includes bibliographical references (leaves 150-172).

This thesis presents results from an experimental study of the impact of dense solid spheres onto granular beds. The overall aim is to further our understanding of the dynamical response of granular materials to impact. In order to do this, we will study both the initial penetration stages and peak acceleration exerted on the sphere by using high-speed imaging. Another critical part is to measure the penetration depth of the sphere and calculate the corresponding depth-averaged stopping force. Both of these main focal points will be assessed for not only dry, but wet and “contaminated” grains, whereby the granular bed will be comprised of two distinct size ranges of base grains. In doing so, we aim to broadly determine whether contaminated grains or wet grains are more effective at increasing the tensile strength of granular materials.

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The hydrophobicity of a titania surface was increased by adsorption of octadecyltrihydrosilane (OTHS). The modified titania surface was characterised using a number of techniques: tapping mode AFM, streaming potential, X-Ray photoelectron spectroscopy and contact angle measurements. With a partial surface coverage of OTHS, a bell-shaped dependence of contact angle with respect to pH was observed, with the maximum advancing contact angle occurring at the point of zero charge of the titanium dioxide substrate. The contact angle change was also influenced by the surface coverage and salt concentration. At extreme pH values there was no further decrease in the contact angle, i.e. saturation occurred. A thermodynamic model was used to describe the influence of surface charge on the contact angle. The results were interpreted as a reduction in the solid-liquid interfacial free energy. The model described the results well until the point where saturation occurred.