Tema 22 de l'assignatura Introducció a les estructures. Grup matí.

Tema 21 de l'assignatura Introducció a les estructures. Grup matí.

Tema 11 de l'assignatura Introducció a les estructures. Grup tarda.

Tema 12 de l'assignatura Sistemes estructurals.

Tema 22 de l'assignatura Introducció a les estructures. Grup tarda.

Tema 11 de l'assignatura Sistemes estructurals.

Tema 21 de l'assignatura Introducció a les estructures. Grup tarda.

Tema 11 de l'assignatura Sistemes estructurals.

Tema 9 de l'assignatura Introducció a les estructures. Grup tarda.

A methodology to retrieve the dielectric function of a nanocomposite from infrared spectroscopy is presented. The use of effective medium theories allows treating the optical response of a multi-phase composite as that of a single phase with an effective response that is a complex function of the components and their spatial arrangement. This methodology has been tested in a case study involving cerium oxide nanoparticles, whose vibrational properties are known to change significantly upon particle size reduction. Accurate values of its dielectric function in the infrared have been retrieved and used to analyse this phenomenon. The main goal of this study is to develop a systematic methodology for the study of the vibrational properties of nanomaterials. It is also intended that the development of effective medium models will be useful for designing new composite nanomaterials with improved optical properties (e.g., solar absorbers).

Red blood cells (RBCs) alterations can cause very severe blood diseases. In thalassemia, the production of hemoglobin polypeptide chains is unbalanced. This causes no symptoms or small blood count alterations in patients with less important genetic mutations, or severe anemia and high morbi-mortality in the most severe cases. Traditional techniques do not perfectly discriminate among different thalassemia degrees and most patients need to undergo genetic studies. Authors have tried alternatives to analyze RBCs, collecting their emission and absorption spectral traits with spectrometers and spectrofluorometers. Multispectral imaging with confocal microscopy allows capturing both tridimensional and spectral information. In this study we are using confocal spectral imaging to analyze RBCs from patients with different degrees of alpha-thalassemia and iron deficiencies. The instrument, a Leica TCS SP8 confocal microscope has high sensitivity hybrid cameras, a diode laser and a white laser combined with an acoustic-optic tunable filter. RBCs exhibited autofluorescence when excited at 405 nm. The mean emission intensities at 502 nm, 628 nm and 649 nm allowed us to discriminate between different etiologies.