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 20 of 26 for “"subnanometer"”.
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Quantitative electron microscopy of supported subnanometer clusters
Small supported particles (a few angstroms in diameter) are useful as catalysts because of their increased surface area for a given volume of material. Their catalytic activity and selectivity depends upon their size, which determines their electronic structure. Therefore, it is vital to reliably …
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Structure Sensitivity in the Subnanometer Regime on Pt and Pd Supported Catalysts
… single atoms and clusters catalysts in the subnanometer size regime maximize the metal utilization and were reported to have extraordinary activities and/or selectivities compared with nanoparticles for various reactions including hydrogenation reactions. However, the relationship between …
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Structure-Sensitivity of CO Oxidation Over Supported Pt Catalysts in the Subnanometer Regime and Its Origin
… change with metal nuclearity, especially in the subnanometer regime. It is also important to understand how the catalytic performance can be tuned by conducting surface modification for a certain metal size. Here, we investigate how the reactivity of CO oxidation reaction changes with the size of …
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Structural and Kinetic Study of Low-temperature Oxidation Reactions on Noble Metal Single Atoms and Subnanometer Clusters
… design of catalysts in the nanometer and subnanometer region. Recent studies showed that catalysts in the subnanometer regime could have extraordinary activity and selectivity. However, the structural performance relationships behind their unique catalytic performances are still unclear. …
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Structure Sensitivity of Alkanes Hydrogenolysis and Alkynes Hydrogenation on Supported Ir Catalysts
… show the difference of Ir nuclearity in the subnanometer regime and nanoparticles (~1.4 nm), while XPS and DRIFTS indicate the difference of electronic properties from metal-support interaction on the two Ir catalysts with the same nuclearity but reduced at different temperatures. Acetylene …
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Nanoporous monolayer graphene membranes for water purification : from concept to realization
… to atoms as small as helium. High-density, subnanometer pores within graphene have the potential for ultra-fast water permeance and high solute rejection as the atomic thinness provides little resistance to flow yet sterically hinders the transport of solutes larger than the pores. The …
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Biomolecular function and failure across length scales
… five orders of magnitude in length scale, from subnanometer intramolecular arrangements to the formation of micron- sized compartments. However, our understanding of protein assembly has largely been confined to the structural organisation and pairwise interactions of individual proteins at the …
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Anomalous solubility behavior of mixed monolayer protected metal nanoparticles
… into ordered domains of single nanometer or subnanometer width on the surface of metal nanoparticles. The morphology and length of the ligand domains (which take the form of ripples on the particle surface) has given these nanoparticles novel properties. Because monolayer protected …
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Super-resolution localization and readout of individual solid-state qubits
… ability to resolve individual NV centers with subnanometer spatial resolution. Furthermore, we demonstrate crosstalk-free individual readout of spin populations within a diffraction limited spot by performing resonant readout of one NV during a spectroscopic sequence of another. This method …
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Protein Loop Length Estimation From Medium Resolution Cryoem Images
… important biophysical technique that produces 3D subnanometer resolution images of molecules not amenable to past approaches like x-ray crystallography or nuclear magnetic resonance. De novo modeling is becoming a promising approach to derive the atomic structure of proteins from the cryoEM 3D …
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Holographische Abbildung nicht-kristalliner organischer und biologischer Makromoleküle mit Elektronenpunktquellen
… und höherer Energie eine Auflösung im Subnanometer-Bereich möglich sein sollte.
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Scalable development of multiplexed microparticle technologies for optical single-cell barcoding
… called ‘laser particles’ (LPs), which possess subnanometer spectral linewidth. This narrowband emission enables us to generate hundreds of unique colors well suited for cellular multiplexing. Using a top-down fabrication approach, we develop a scalable method to produce billions of micron-sized …
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Carbon nanotube electrodes for capacitive deionization
… geometeries, overlapping double layers, and subnanometer diameters. In this work, we design ordered-geometry, vertically-aligned carbon nanotube electrodes. The CNTs in this study have 2-3 walls, inner diameter of 5.6 nm and outer diameter of 7.7 nm. The capacitance and charging dynamics were …
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Molecular mechanics of DNA bricks: in situ structure, mechanical properties and ionic conductivity
… to produce custom three-dimensional objects with subnanometer precision. In contrast to DNA origami, the DNA brick method permits a variety of different structures to be realized using the same library of DNA strands. As a consequence of their design, however, assembled DNA brick structure have …
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Transport properties of synthetic nanopores
… to manufacture pores in synthetic membranes with subnanometer precision, so-called synthetic nanopores. Immersed in aqueous solution, these nanopores can be deployed to study the translocation of charged molecules and ions, a process of main importance in biology. However, researchers run into …
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Design and implementation of high-bandwidth, high-resolution imaging in atomic force microscopy
Video-rate imaging with subnanometer resolution without compromising on the scan range has been a long-awaited goal in Atomic Force Microscopy (AFM). The past decade saw significant advances in hardware used in atomic force microscopes, which further enable the feasibility of high-speed Atomic …
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Phase Transitions of Multivalent Adaptor Proteins
… properties that allow these interactions at the subnanometer scale to give rise to formation of cellular structures, the compartments that are listed above. This thesis proposes a hypothesis based on polymerization of multivalent proteins that causes these complexes to phase separate in solution. …
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Solid-state nanopore sensors for nucleic acid analysis
… to kilobase long genomic DNA fragments with subnanometer resolution. Recent advances in nanopores suggest that this low-cost, highly scalable technology could lend itself to the development of third generation DNA sequencing technologies, promising rapid and reliable sequencing of the human …
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Structure Sensitivity of Alkane Hydrogenolysis on Ir/MgAl₂O₄ Catalysts
… atoms is evidently higher than that with the subnanometer clusters in both reactions, but the selectivity to the target product of ethane is not quite dependent on the particle size in the n-butane hydrogenolysis. After the fundamental analysis, it is proposed that the reaction mechanism of …
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Shape dependent iron oxide nanoparticles for simultaneous imaging and therapy
… we explored the cellular uptake behaviors of the subnanometer ultrasmall nanoparticles and ultrathin nanowires. The nanoparticles were functionalized with tannic acid and incubated with HepG2 cells. The shape dependent cellular uptake was quantified, and the ultrasmall nanoparticles exhibited a …
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