Magnetic Nanoparticles Thesis

Magnetic Nanoparticles Thesis-16
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.

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The SLNs therefore play a crucial role in the staging and treatment of cancer.

This thesis describes the use of magnetic nanoparticles for SLN identification in colorectal- and breast cancer.

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.

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

Magnetic Nanoparticles Thesis

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).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.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 .It was found that solvents containing functional groups (especially primary alcohols) afforded the greatest control over final MNP morphology and that the presence of additional alkyl substituents could disrupt the packing of surfactant molecules around a particle surface, giving rise to more complex ‘compound’ MNPs.Magnetic measurements show the particles to be superparamagnetic, with saturation magnetisation values close to that of the bulk.A modified seed growth method was designed for obtaining optimal nanoparticle properties for magnetic fluid hyperthermia.With a one or two addition process, iron oxide nanoparticles were produced with crystallite sizes ranging from 5-20 nm using only benzyl alcohol and iron precursor.Presence of metastasis is an important prognostic factor, and is used to determine the optimal treatment of the patient.The sentinel lymph nodes (SLNs) receive direct lymphatic drainage from the tumour area, and are therefore most likely the first site of metastasis, if present.


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