Magnetic Nanoparticles Thesis

Magnetic Nanoparticles Thesis-28
The X-ray photoemission electron microscopy (PEEM) data are complemented with in situ reflection high energy electron diffraction (RHEED) investigations, ex situ scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements.This approach enabled to correlate the magnetic character of the particles with their individual size.Iron oxide nanoparticles have received sustained interest for biomedical applications as synthetic approaches are continually developed for precise control of nanoparticle properties.

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The effects of reaction environment, temperature, concentration, and modified seed growth parameters were investigated to obtain precise control over properties affecting radiofrequency heat generation.

This thesis details the chemical synthesis and nanocharacterisation of magnetic nanoparticles (MNPs).

A commercially available magnetometer and magnetic tracer were used for SLN identification in patients suffering from colorectal cancer to evaluate the feasibility of the technique.

Patient, animal and phantom studies were performed to optimize the use of the SLNB technique with magnetic nanoparticles in breast cancer patients.

The thesis addresses a subject with broad implications in various scientific and technical areas.

It presents unique direct observations of the magnetic state of single particles of iron (Fe), cobalt (Co) and nickel (Ni) with nanoscopic dimensions by means of spatially-resolved X-ray magnetic circular dichroism (XMCD).We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising.For further information, including about cookie settings, please read our Cookie Policy .This ferromagnetic state is assigned to an energetically excited, metastable structure which has a remarkably long life time before it decays into the expected superparamagnetic state.Combining PEEM with XMCD measurements allowed for the first time to follow the spontaneous transition from ferromagnetic to superparamagnetic behavior in single nanoparticles.The experimental findings are compared with calculated magnetic anisotropy contributions of the three different types of deposited nanoparticles (NPs).It was found that despite their different atomic structure, the body-centered cubic (bcc) iron and face-centered cubic (fcc) cobalt nanoparticles have a similar behavior and can exist in a state which demonstrates an unexpected ferromagnetic (FM) behavior with sizes down to 8 nm at room temperature (RT), while nickel particles only exhibit the expected superparamagnetic (SPM) behavior.In colorectal cancer currently used experimental techniques suffer from limitations, hampering widespread clinical implementation of the technique. However, the worldwide availability of radioisotopes, and therefore the best treatment, is limited. In colorectal cancer, the objective is to introduce a SLN procedure allowing to improve nodal staging accuracy in a routine clinical workflow after ex vivo administration of magnetic nanoparticles.In breast cancer, we aim to introduce an entirely radioisotope-free method for in vivo SLN Biopsy (SLNB).In Chapter 4 It was found that by replacing the polyol solvents used in Chapter 3 with a large excess of bulky surfactant molecules it was possible to form high aspect ratio lanthanide oxide (Ln Ox) nanowires and ribbons.It was found that the nanowires formed via an intriguing 3-stage ‘oriented assembly’ mechanism, in which individual NPs form, before aligning anisotropically and recrystallising into a more crystallographically homogeneous product.


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