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You searched for subject:( lanthanides dysprosium). Showing records 1 – 2 of 2 total matches.

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University of Victoria

1. Van Gordon, Kyle. Modification of aspect ratio and surface charge to decrease sequestration of MRI contrast nanomaterials.

Degree: Department of Chemistry, 2020, University of Victoria

Contrast agents for magnetic resonance imaging (MRI) are but one of a variety of nanosystems that have incredible potential for the detection and diagnosis of cancer. Nanosystems share a common disadvantage: they are quickly sequestered by biological processes that clear foreign material from the body, requiring ever larger doses to accumulate in targets, and reducing their overall effectiveness and viability. This thesis explores a pair of strategies for nanomaterials to boost their evasiveness from these defensive systems in the context of lanthanide MRI contrast agents, in an attempt to increase their probability to collect in cancerous tissue. Chapter 1 provides precedent and rationale for the modification of two parameters regarding novel nanosystem design: aspect ratio and zeta potential. Chapter 2 details the controlled syntheses and analysis of sodium dysprosium fluoride nanomaterials at a range of aspect ratios. Chapter 3 concerns the construction of tunable zwitterionic polymer coatings for synthesized nanomaterials to demonstrate control over the zeta potential in aqueous dispersion. Chapter 4 tests polymer-coated spherical nanoparticles and nanorods for internalization into or adsorbance onto a cancerous cell line. Chapter 5 summarizes the work of the previous chapters and suggests future research approaches. Though internalization or adsorbance onto HeLa cells was not observed for prepared nanomaterials, control over their aspect ratio at the synthetic level and zeta potential via constructed zwitterionic polymers was demonstrated, with implications for application to a plethora of nanosystems. Advisors/Committee Members: van Veggel, Frank C. J. M. (supervisor).

Subjects/Keywords: nanoparticles; nanorods; nanomaterials; MRI; relaxation; lanthanides; contrast agents; T1; T2; dysprosium; PMAO; zeta potential; HeLa; internalization assay; aspect ratio; EPR effect; MPS

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APA (6th Edition):

Van Gordon, K. (2020). Modification of aspect ratio and surface charge to decrease sequestration of MRI contrast nanomaterials. (Masters Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/11892

Chicago Manual of Style (16th Edition):

Van Gordon, Kyle. “Modification of aspect ratio and surface charge to decrease sequestration of MRI contrast nanomaterials.” 2020. Masters Thesis, University of Victoria. Accessed April 14, 2021. http://hdl.handle.net/1828/11892.

MLA Handbook (7th Edition):

Van Gordon, Kyle. “Modification of aspect ratio and surface charge to decrease sequestration of MRI contrast nanomaterials.” 2020. Web. 14 Apr 2021.

Vancouver:

Van Gordon K. Modification of aspect ratio and surface charge to decrease sequestration of MRI contrast nanomaterials. [Internet] [Masters thesis]. University of Victoria; 2020. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/1828/11892.

Council of Science Editors:

Van Gordon K. Modification of aspect ratio and surface charge to decrease sequestration of MRI contrast nanomaterials. [Masters Thesis]. University of Victoria; 2020. Available from: http://hdl.handle.net/1828/11892


University of Otago

2. Lee, Au-Chen. Dipolar Bose-Einstein Condensate with a Vortex .

Degree: University of Otago

We theoretically consider the properties of a dipolar Bose-Einstein condensate with a vortex. Our theory includes the influence of the leading order quantum fluctuation corrections which allows the condensate to stabilize into a droplet state in the regime of dominant dipole interactions. We develop numerical techniques to accurately and efficiently calculate the stationary vortex states and the quasi-particle excitations. These methods are carefully benchmarked where possible. We make a brief study of self-bound vortex droplets, considering their basic properties, and presenting a phase diagram for where they exist. We also compare our calculations to results which appeared from another group during our research. We show that their results suffer from serious numerical issues and are unreliable. We focus on studying the properties of a vortex line in an elongated dipolar Bose-Einstein condensate confined by a prolate trap. Increasing the strength of the dipole-dipole interactions relative to the short ranged contact interactions we find that the system crosses over to a self-bound vortex droplet stabilized from collapse by quantum fluctuations. We calculate the quasiparticle excitation spectrum of the vortex state, which is important in characterizing the vortex response, and assessing its stability. When the DDIs are sufficiently strong we find that the vortex is dynamically unstable to quadrupolar modes. Advisors/Committee Members: Blakie, Blair (advisor).

Subjects/Keywords: Bose-einstein condensates; BEC; nonlinear; condensate; Gross-Pitaevskii; nonlinear Schrödinger equation; vortices; Collective excitations; vortex self-bound droplets; dipolar BEC; dipolar quantum; quantum fluctuations; Bogoliubov-de Gennes; instability; quadrupolar modes; dynamical stability; dipole interaction; density approximation; dipolar Bose-Einstein condensate; quasi-particle excitations; vortex; Hankel Transformation; Bessel function; cosine transformation; Cylindrical; BdG; Bogoliubov-de Gennes Equation; numerical calculations; DDI; dipole-dipole interactions; phonon dispersion; dynamical instability; eigenvalue problem; eigenvector; imaginary time evolution; laplacian operator; GPE; Gross–Pitaevskii equation; zero-norm; Kohn modes; Bessel grid; DDIs; numerical techniques; dipolar; dipolar BECs; LHY term; local density treatment; vortex stationary states; Kelvin wave (helical) excitations; stabilized from collapse; quasi-particle; leading order quantum fluctuation correction; lanthanides dysprosium; dysprosium; Dy; s-wave interaction; many-body physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lee, A. (n.d.). Dipolar Bose-Einstein Condensate with a Vortex . (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/9254

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16th Edition):

Lee, Au-Chen. “Dipolar Bose-Einstein Condensate with a Vortex .” Masters Thesis, University of Otago. Accessed April 14, 2021. http://hdl.handle.net/10523/9254.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7th Edition):

Lee, Au-Chen. “Dipolar Bose-Einstein Condensate with a Vortex .” Web. 14 Apr 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Lee A. Dipolar Bose-Einstein Condensate with a Vortex . [Internet] [Masters thesis]. University of Otago; [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10523/9254.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Lee A. Dipolar Bose-Einstein Condensate with a Vortex . [Masters Thesis]. University of Otago; Available from: http://hdl.handle.net/10523/9254

Note: this citation may be lacking information needed for this citation format:
No year of publication.

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