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This dissertation by Hafiz Muhammad Sohail explores the interaction of metal adsorbates with elemental semiconductor surfaces, specifically focusing on silver (Ag) interactions with Si(111) and Ge(111) surfaces. The research utilizes experimental techniques such as angle-resolved photoelectron spectroscopy (ARPES), core-level spectroscopy, scanning tunneling microscopy (STM), and low energy electron diffraction (LEED), further supported by theoretical analysis using density functional theory (DFT). The work investigates the electronic and atomic structures of these surfaces, examining transitions from metallic to semiconductor phases and the formation of binary surface alloys with elements like tin (Sn) and lead (Pb). The thesis aims to deepen the understanding of surface physics and material properties, targeting researchers and professionals in advanced materials science and semiconductor physics.
Surface chemistry. --- Semiconductors. --- Surface chemistry --- Semiconductors
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This dissertation by Feng-I Tai explores the fundamental properties and applications of polyampholytic hydrogels, developed for their antifouling capabilities. It examines the balance of positive and negative charges within these polymers, which are crucial for preventing non-specific protein adsorption. The research employs techniques like photografting and SIPGP to create hydrogel thickness gradients and uses spectroscopic methods such as infrared spectroscopy and ellipsometry to analyze their swelling and charge distribution. Additionally, atomic force microscopy is used to measure surface forces, contributing to the understanding of hydrogel interactions. The work aims to enhance the development of antifouling coatings and optical sensing platforms. The study is intended for researchers and professionals in materials science, particularly those interested in hydrogels' applications and surface chemistry.
Surface chemistry. --- Polymers. --- Surface chemistry --- Polymers
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