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.
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Showing 1 to 14 of 14 for “"Atomic precision"”.
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CONSTRUCTING NANOSTRUCTURES WITH ATOMIC PRECISION: THE SYNTHESIS OF SPIROLIGOMER-BASED MACROCYCLES
This dissertation presents the development of a synthetic strategy to produce various spiroligomer-based macrocycles that bridge the gap between organic molecules and small proteins. “Spiroligomers” (formerly known as “bis-peptides”) are a class of molecules produced by the assembly of “bis-amino …
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Effective tuning of bimetallic composition of gold-copper nanomolecules and the emergence of plasmon-like feature in optical spectra
… synthesized and characterized by using ESI-MS to atomic precision. A maximum of 23 copper atoms replace the gold atoms; when the number of copper atoms is higher than eight, a surface plasmon-like peak appears at ∼520 nm. Based on the fundamental, elemental properties of Au and Cu, we predict a …
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The Future Military Applications and International Security Implications of Biotechnology and Nanotechnology
… of eventual manipulation of matter on the atomic level, the theoretical basis for nanotechnology. Nanotechnology may enable manufacturing with atomic precision. And nanotechnology could be the deciding factor in the constitution of global militaries through the twenty-first century.
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Squeezing collective atomic spins with an optical resonator
… quantum limit of signal-to-noise ratio in atomic precision measurements. In both methods, the interaction between an ultracold atomic ensemble and an optical resonator serves to entangle the atoms and deform the uncertainty distribution of the collective hyperfine spin so that it is …
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Scanning Tunneling Microscopy Studies of Cluster Diffusion in a Highly Mismatched system:Copper on Silver(111)
… directly by tracking cluster motion with atomic precision at multiple temperatures to determine the temperature dependence of hop rates. In contrast with larger homoepitaxial islands on Ag(111) and Cu(111), small-to-medium sized clusters (3-30 atoms) of Cu on Ag(111) display a …
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Scanning Tunneling Microscopy Studies of Cluster Diffusion in a Highly Mismatched System: Copper on Silver(111)
… directly by tracking cluster motion with atomic precision at multiple temperatures to determine the temperature dependence of hop rates. In contrast with larger homoepitaxial islands on Ag(111) and Cu(111), small-to-medium sized clusters (3-30 atoms) of Cu on Ag(111) display a …
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Synthetic ground truth of biological shapes — Simulating variable Nuclear Pore Complexes for Microscopy
… of NPC proteins has been resolved with pseudo-atomic precision, however, observed NPC heterogeneities, such as varying diameters, elongated shapes, 9-fold symmetry, and irregular shapes, evidence a high degree of divergence from this average. Single Molecule Localization Microscopy (SMLM) …
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Method development for mass spectrometric characterization of ultra-small nanomolecules and mass spectrometry imaging of selected biomolecules
… of the ultra-small nanomolecules (NMs) to atomic precision and obtain spatial resolution of selected biomolecules using mass spectrometry imaging (MSI). Chapter I includes introduction to electrospray ionization (ESI) and matrix assisted laser desorption ionization (MALDI) MS used in my PhD …
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Synthesis, characterization and modification of carbon nanomaterials
… general argument that the CNT walls stem from atomic steps at the catalyst. It is argued that after nucleation, the substrate itself provides a catalytic functionality towards the stimulation of ongoing CNT growth, whereas the catalytic activity of the metal particle is more restricted to the …
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Theoretical Modelling and Characterisation of Concerted Tip and Surface Effects in NC-AFM
… that image molecules and surfaces with atomic precision. One such technique that has answered this call is Non-Contact Atomic Force Microscopy (NC-AFM), which has a very successful history of directly probing many atomic properties on a wide variety of systems. Interpretation of …
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Ligand Effect on Gold Nanomolecules Demonstrated Using Aliphatic, Aromatic and Bulky Thiolate Ligands
Atomically precise thiolate protected gold nanoparticles (AuNPs) known as gold nanomolecules (AuNMs) are intensely pursued owing to their feasibility to elucidate their structure by single crystal X-ray crystallography. They have distinct number of Au atoms (n) and thiolate (-SR, R-hydrocarbon …
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Advanced Epitaxy on 2D Materials for Bottom-up Heterointegration with Low-defects and Membrane Production with High-throughput
… properties of the epilayers by the penetrated atomic potential from the substrate through the graphene layer. It provides a new pathway towards the heterogeneous integration of largely lattice-mismatched systems with minimized dislocation density, which could eventually broaden the material …
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General Device Integration Strategies for Two-Dimensional Materials
… severe in case of heterostructures that rely on atomically clean interfaces. 2DLMs will only be a true candidate for commercial applications if sufficiently clean transfer methods are found that will enable large scale fabrication. The work presented in this thesis addresses this challenge in two …
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Gold And Silver Alloy Nanoparticles: Synthesis, Characterization And Atomic Structure
… Modern research focus on method development in atomically monodisperse nanoparticle synthesis. This dissertation describes the method development for synthesis and isolation of atomically precise gold and gold-silver alloy nanoparticles and their comprehensive characterization and atomic …