Nitrogen-vacancy (N-V) centers are the most widely studied crystallographic defect in the diamond lattice since their presence causes strong and stable fluorescence. The negative charge state of the defect (NV-) is especially desired because of its potential for quantum information processing. In this study, fluorescent suspensions of diamond particles have been produced by microbead-assisted ultrasonic disintegration of commercially obtained diamond powder containing N-V color centers. Zirconium dioxide ZrO2 was chosen as an abrasive and a mixture of deionized water and dimethyl sulfoxide (DMSO) was used as a solvent. Raman spectrum of the starting material has been obtained and the resulting liquids have been measured in terms of photoluminescence. Moreover, thin layer of the diamond particles has been deposited on a silicon substrate and examined using scanning electron microscopy (SEM). During the course of the experiment a new method, which uses sodium chloride NaCl as an abrasive, has been proposed. The results of fluorescence measurements of the suspension prepared using this technique are highly promising.
Thromboembolic complications are one of the major problems in mechanical heart support of patients suffering from critical heart failure. The goal of the study was to present and discuss methodology of non-invasive assessment of embolization in rotary blood pumps. The study was carried out based on power consumption trend analysis as well as spectral analysis of acoustic signal produced by the pump during its operation. It has been demonstrated that the trend of power rising and presence of 3rd harmonic in acoustic spectrum corresponds to the clinical symptoms of pump embolization.
The main object of this research was to assess the ability to characterize the gold nanoparticles using optical modalities
like optical coherence tomography. Since the nanoparticles, especially gold one, have been very attractive for medical
diagnosis and treatment the amount of research activities have been growing rapidly. The nanoparticles designed for
different applications like contrast agents or drugs delivery change the optical features of tissue in different way.
Therefore, the expanded analysis of scattering optical signal may lead to obtain much more useful information about the
tissues health and the treatment efficiency. The noninvasive measurements of the concentration and distribution of the
nanoparticles, as well as their size in the media have been taken under consideration. For this purpose the polarization
sensitive optical coherence tomography system with spectroscopic analysis (PS-SOCT) has been designed and used. In
this contribution we are going to present the PS-SOCT measurement data obtained for the gold nanoparticles. The
measurements have been taken for the liquid (gold nanoparticles in water) samples changing the particles concentrations
Bio-ceramics such as hydroxyapatite (HAp) are widely used materials in medical applications, especially as an interface
between implants and living tissues. There are many ways of creating structures from HAp like electrochemical assisted
deposition, biomimetic, electrophoresis, pulsed laser deposition or sol-gel processing. Our research is based on analyzing
the parameters of the sol-gel method for creating thin layers of HAp. In order to achieve this, we propose to use Optical
Coherence Tomography (OCT) for non-destructive and non-invasive evaluation. Our system works in the IR spectrum
range, which is helpful due to the wide range of nanocomposites being opaque in the VIS range. In order to use our method
we need to measure two samples, one which is a reference HAp solution and second: a similar HAp solution with
nanoparticles introduced inside. We use silver nanoparticles below 300 nm. The aim of this research is to analyze the
concentration and dispersion of nanodopants in the bio-ceramic matrix. Furthermore, the quality of the HAp coating and
deposition process repetition have been monitored. For this purpose the polarization sensitive OCT with additional
spectroscopic analysis is being investigated. Despite the other methods, which are suitable for nanocomposite materials
evaluation, the OCT with additional features seems to be one of the few which belong to the NDE/NDT group. Here we
are presenting the OCT system for evaluation of the HAp with nano-particles, as well as HAp manufacturing process.
A brief discussion on the usefulness of OCT for bio-ceramics materials examination is also being presented.